CN101350812A - Data transmission method, communication apparatus and communication system - Google Patents
Data transmission method, communication apparatus and communication system Download PDFInfo
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- CN101350812A CN101350812A CN 200810042023 CN200810042023A CN101350812A CN 101350812 A CN101350812 A CN 101350812A CN 200810042023 CN200810042023 CN 200810042023 CN 200810042023 A CN200810042023 A CN 200810042023A CN 101350812 A CN101350812 A CN 101350812A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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Abstract
The embodiment of the invention discloses a data transmission method, communication equipment and a communication system. The method comprises: packing the data to a plurality of GTP-U data packets; compressing a IP head, a UDP head and a GTP-U head in some GTP-U data packets in the GTP-U data packets to form the compressed GTP-U data packet; sending the uncompressed GTP-U data packets in the GTP data packets and the compressed GTP-U data packets to a receiving device. The compressed GTP-U data packets at least comprises a compression head which is formed by compressing the IP head, the UDP head and GTP-U head, and the compression head at least comprises a context identification CID, wherein, the CID is same with the CID in the uncompressed GTP-U data packet which comprises the same IP head, the same UDP head and the same GTP-U head. The embodiment of the invention can save the transmission cost and promote the transmission efficiency.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of transmission method, communication equipment and communication system of data.
Background technology
Tunneling technique (Tunneling) is a kind of mode of passing through infrastructure Data transmission between network of internet usage network.The data (or load) of using the tunnel to transmit can be the Frame or the bag of different agreement.Tunnel protocol sends the Frame of other agreement or bag encapsulation again then by the tunnel.New frame head provides routing iinformation, so that transmit packed load data by the Internet.
Along with the development of tunneling technique, miscellaneous service has begun to formulate the corresponding tunnel agreement according to this business features.Tunnel protocol among the GPRS (General Packet Radio Service, GPRS) is GTP (GPRS Tunnel Protocol, a GPRS Tunnel Protocol).The packet that can be various protocols by GPRS Tunnel Protocol provides the tunnel by the transmission of GPRS backbone network.GTP is according to the protocol requirement that is delivered, utilize TCP (Transmission Control Protocol, transmission control protocol) or UDP (User Datagram Protocol, User Datagram Protoco (UDP)) provides reliable connection, such as the transmitted in packets of supporting X.25, with no Connection Service, divide into groups such as IP (Internet Protocol, Internet protocol).
When The data UDP/IP path agreement was transmitted on IP network, the wireless access side apparatus need adopt GTP to encapsulate the GTP-U packet of formation again to the packet that receives the terminal transmission.When described IP network was PPP (Point-to-Point Protocol, point-to-point link agreement) link, then the GTP-U packet of Xing Chenging was referring to Fig. 1.As seen from the figure, its transport overhead comprises GTP-U head, transport network layer UDP, transport network layer IP and PPP header overhead, totally 43 or 47 bytes.For the average message length of transmission is when being 286 bytes in the general data business, its efficiency of transmission is 87.32%, and the transport overhead of this moment is 43 bytes.Usually, at LTE (Long Time Evolution, Long Term Evolution) or SAE (System Architecture Evolution, System Architecture Evolution) data message above 50% being arranged in the system is small data packets, wherein, the size of valid data is about 40 bytes except transport overhead, and is perhaps littler, when transport overhead was 43 bytes, then its efficiency of transmission was 48.19% to the maximum.In order to reduce transport overhead, can pass through PPP (Point to Point Protocol in the prior art, point-to-point protocol) layer address and control domain compression ACFC and protocol domain compression PFC consult, the PPP frame head is reduced to 4 bytes, but be 50% to the maximum for the efficiency of transmission of little GTP-U packet.
When described IP network was Ethernet, then the GTP-U packet of Xing Chenging was referring to Fig. 2, and as seen from the figure, its transport overhead comprises GTP-U head, UDP, IP, Ethernet expense totally 58 or 62 bytes.When the average message length of transmission was 286 bytes in the corresponding general data business, when transport overhead was 58 bytes, its efficiency of transmission was 83.62% to the maximum.Usually, data message is a small data packets in LTE or SAE system, and wherein, the size of valid data is about 40 bytes except transport overhead, and when transport overhead was 58 bytes, then its efficiency of transmission was 40.82% to the maximum.
By the calculating of above efficiency of transmission to the GTP-U packet as can be known, in the prior art during by GTP transmission data, transport overhead comprises GTP-U head, UDP, IP etc., usually in the data packets for transmission except transport overhead active data big or small similar to the transport overhead size, therefore, in the transmission data, exist transport overhead big, waste bandwidth, the shortcoming that efficiency of transmission is low.
Summary of the invention
The embodiment of the invention provides a kind of transmission method, communication equipment and communication system of data, can reduce transport overhead, improves efficiency of transmission, and it is big to have solved in the prior art transport overhead, waste bandwidth, the shortcoming that efficiency of transmission is low.
Wherein, the transmission method of a kind of data that the embodiment of the invention provides comprises:
With data encapsulation is a plurality of GTP-U packets;
With IP head, UDP head and the GTP-U header suppression in the part GTP-U packet in described a plurality of GTP-U packets, form the GTP-U packet after compressing, at least comprise the compression head that forms after described IP head, UDP head and the GTP-U header suppression in the GTP-U packet after the described compression, described compression head comprises Context identifier CID at least, wherein, described CID is identical with CID in the unpressed GTP-U packet that comprises identical IP head, UDP head and GTP-U head;
The GTP-U packet that forms after unpressed GTP-U packet and the described compression in described a plurality of GTP-U packets is sent to receiving system.
The embodiment of the invention also provides a kind of transmission method of data, comprising:
Receive the GTP-U packet that unpressed GTP-U packet and compression back form, at least comprise Context identifier CID in the GTP-U packet that described compression back forms, wherein, described CID is identical with CID in the unpressed GTP-U packet that comprises identical IP head, UDP head and GTP-U head;
According to CID in the GTP-U packet of described reception compression back formation and the CID in the unpressed GTP-U packet of described reception, with the GTP-U packet reduction that forms after the described compression.
The embodiment of the invention provides a kind of communication equipment, comprising:
Encapsulation unit, being used for data encapsulation is a plurality of GTP-U packets;
Compression unit, with IP head, UDP head and the GTP-U header suppression in the part GTP-U packet in a plurality of GTP-U packets after the described encapsulation, form the GTP-U packet after compressing, at least comprise the compression head that forms after described IP head, UDP head and the GTP-U header suppression in the GTP-U packet after the described compression, described compression head comprises Context identifier CID at least, described CID is identical with CID in the unpressed packet, is used for decompress GTP-U packet after the described compression of receiving system;
Transmitting element is used to send unpressed GTP-U packet, sends the GTP-U packet after compressing.
The embodiment of the invention provides a kind of receiving system, comprising:
The 3rd receiving element is used for the GTP-U packet after transmission and reception apparatus sends unpressed GTP-U packet and compression, comprises CID in the described GTP-U packet for compression;
Decompression unit is used for according to the CID of the GTP-U packet that forms after the described reception compression and the CID in the unpressed GTP-U packet of described reception the GTP-U packet after the described compression being reduced.
The embodiment of the invention provides a kind of communication system, comprising:
Dispensing device, being used for data encapsulation is a plurality of GTP-U packets, comprise Context identifier CID in the described GTP-U packet, with IP head, UDP head and GTP-U header suppression in the part GTP-U packet in described a plurality of GTP-U packets, form the GTP-U packet after compressing, at least comprise described CID in the GTP-U packet after the described compression, send GTP-U packet after unpressed GTP-U packet and the described compression to receiving system;
Receiving system, GTP-U packet after being used to receive described unpressed GTP-U packet and compress, according to CID in the GTP-U packet of described reception compression back formation and the CID in the unpressed GTP-U packet of described reception, the GTP-U packet after the described compression is reduced.
The technical scheme that the embodiment of the invention provides, consult compressed information by dispensing device and receiving system, behind the dispensing device unpressed complete GTP-U packet of transmission at interval, dispensing device according to negotiation result with the IP head in the GTP-U packet, UDP head and GTP-U head join together to compress, the compressed IP head of dispensing device transmission afterwards, the GTP-U packet that forms behind UDP head and the GTP-U head is to receiving system, receiving system is according to the information of consulting, restore the head of complete GTP-U packet, thereby saved transport overhead, improved efficiency of transmission.
Description of drawings
Fig. 1 is the GTP-U data packet format that forms on ppp link in the prior art;
Fig. 2 is the GTP-U data packet format that forms in the route network environment in the prior art;
Fig. 3 is the method flow diagram that the transmission method of a kind of data that the embodiment of the invention provides is described from dispensing device;
Fig. 4 is the method flow diagram that the transmission method of a kind of data that the embodiment of the invention provides is described from receiving system;
Fig. 5 is the method flow diagram of the transmission method of a kind of data of providing of the embodiment of the invention one;
Fig. 6 is the method flow diagram of the transmission method of a kind of data of providing of the embodiment of the invention two;
Fig. 7 is a message format of consulting compressed information in the embodiment of the invention two;
Fig. 8 is encapsulated into the complete method flow diagram that meets the GTP-U packet that transmits on the ppp link in the embodiment of the invention two;
Fig. 9 is encapsulated into the complete method flow diagram that meets the GTP-U packet that transmits in the route network environment in the embodiment of the invention two;
Figure 10 is to the compression zone schematic diagram of complete GTP-U packet in the embodiment of the invention two;
Figure 11 is the form of IP head in the GTP-U packet complete in the embodiment of the invention two;
Figure 12 is the form of UDP head in the GTP-U packet complete in the embodiment of the invention two;
Figure 13 is the form of GTP-U head in the GTP-U packet complete in the embodiment of the invention two;
Figure 14 is the form of in the embodiment of the invention two transport network layer IP head, transport network layer UDP head and GTP-U head being united the GTP-U/IP/UDP head of the formation after the compression;
Figure 15 is the method flow diagram of the transmission method of a kind of data of providing of the embodiment of the invention three;
Figure 16 is to the compression zone schematic diagram of complete GTP-U packet in the embodiment of the invention three;
Figure 17 is the composition diagram of a kind of communication equipment of providing of the embodiment of the invention four;
Figure 18 is the composition diagram of a kind of communication equipment of providing of the embodiment of the invention five;
Figure 19 is the composition diagram of a kind of communication equipment of providing of the embodiment of the invention six;
Figure 20 is the composition diagram of a kind of receiving system of providing of the embodiment of the invention seven;
Figure 21 is the composition diagram of a kind of communication system of providing of the embodiment of the invention eight.
Embodiment
The embodiment of the invention provides a kind of transmission method, communication equipment and communication system of data, by dispensing device the data that send being done compression handles, receiving system according to receiving system in set up identical index, with the reduction of data after the compression, make the identical data of transmission that in transmission course, needn't repeat, thereby saved transport overhead, improved efficiency of transmission.
At first, the transmission method of a kind of data that provide from the dispensing device one side explanation embodiment of the invention referring to shown in Figure 3, comprising:
Step T1 is a plurality of GTP-U packets with data encapsulation;
Step T2, with IP head, UDP head and the GTP-U header suppression in the part GTP-U packet in described a plurality of GTP-U packets, form the GTP-U packet after compressing, at least comprise the compression head that forms after described IP head, UDP head and the GTP-U header suppression in the GTP-U packet after the described compression, described compression head comprises Context identifier CID at least, wherein, described CID is identical with CID in the unpressed GTP-U packet that comprises identical IP head, UDP head and GTP-U head;
Step T3 sends to receiving system with the GTP-U packet that forms after unpressed GTP-U packet and the described compression in described a plurality of GTP-U packets.
Secondly, the transmission method of a kind of data that provide from the receiving system one side explanation embodiment of the invention referring to Fig. 4, comprising:
Step P1, receive the GTP-U packet that unpressed GTP-U packet and compression back form, at least comprise Context identifier CID in the GTP-U packet that described compression back forms, wherein, described CID is identical with CID in the unpressed GTP-U packet that comprises identical IP head, UDP head and GTP-U head;
Step P2 is according to CID in the GTP-U packet of described reception compression back formation and the CID in the unpressed GTP-U packet of described reception, with the GTP-U packet reduction that forms after the described compression.
More than be respectively from dispensing device, or the transmission method of receiving system one side a kind of data that the embodiment of the invention is provided is done explanation.Below from dispensing device and receiving system both sides, the transmission method of a kind of data that the embodiment of the invention is provided describes, and may further comprise the steps:
Wherein, the identical index of setting up in dispensing device and the receiving system in the step 2, can be identical to set up the index that index information is set up according to what preset in dispensing device and the receiving system, also can be by dispensing device and receiving system negotiation communication, sets up index.Described index can be the Context identifier CID among the embodiment of back.
The transmission method of a kind of data that the embodiment of the invention provides, with receiving system head in the complete GTP-U packet that sends in the dispensing device is set up identical index by dispensing device, dispensing device needn't send complete head in the GTP-U of follow-up transmission packet, but the head after the transmission compression, receiving system according to the index of preserving with receive compression after the GTP-U packet in index conform to, with the reduction of the GTP-U packet after the compression, thereby saved transport overhead, improved efficiency of transmission.
It more than is the explanation of the summary of method that the invention process example is provided, it also is the simplest method, in order to make transfer of data more accurate, more reliable, usually dispensing device and receiving system all need to obtain compressed information, and the result of the described compressed information that obtains can be the result who consults compressed information.Following embodiment will be described in detail the method that the embodiment of the invention provides.
Below in conjunction with specific embodiments and the drawings the embodiment of the invention is described in detail.
Embodiment one, and a kind of transmission method of data referring to Fig. 5, comprising:
Step S1, dispensing device and receiving system are consulted compressed information;
Step S2, described dispensing device is a plurality of GTP-U packets with data encapsulation;
Step S3, described dispensing device be according to consulting compressed information, will encapsulate that part GTP-U packet sends to receiving system according to time sequencing in a plurality of GTP-U packets;
Step S4, described dispensing device is according to consulting compressed information, IP head, UDP head and GTP-U header suppression with in the GTP-U data of remainder in a plurality of GTP-U packets in encapsulation back send to receiving system with the GTP-U packet after the compression according to time sequencing;
Step S5, receiving system receive the GTP-U packet after unpressed GTP-U packet and the compression, according to the information of consulting and the unpressed GTP-U packet of transmission, and the GTP-U packet after the compression of receiving that decompresses.
Wherein, described dispensing device is the wireless access side apparatus, and this wireless access side apparatus can be base station or base station controller etc.Described receiving system can be base station or gateway SGW etc.
The transmission method of a kind of data that the employing embodiment of the invention one provides, consult compressed information by dispensing device and receiving system, dispensing device is according to the compressed information after consulting, with IP head, UDP head and GTP-U header suppression in the GTP-U packet, thereby saved transport overhead, improved efficiency of transmission.This method is applicable to network busy usually, uses under the not enough relatively situation of bandwidth.
The transmission method of a kind of data that above embodiment one provides is method flows of a kind of summary, this method is applicable to IP network, this IP network is subdivided into PPP (Point-to-Point Protocol, peer-peer protocol) link and Ethernet Ethernet, then the transmission method to data on the user plane protocol has difference.Respectively the compression method of user plane protocol under the both of these case is elaborated below in conjunction with embodiment two, three.
Embodiment two, a kind of transmission method of data, and this method is applicable to ppp link.The GRP-U packet that satisfies the ppp link requirement of compression is transmitted on ppp link.Dispensing device is a base station in the present embodiment, and receiving system is to send data to the affiliated base station of purpose terminal.In fact, receiving system also can be gateway SGW.Method flow diagram referring to shown in Figure 6 comprises:
Step Q1 sends the base station and consults compressed information with receiving the base station by Network Control Protocol NCP agreement, and described NCP agreement is carried on the ppp protocol;
Wherein, the concrete steps of consulting in step Q1 comprise: send the base station and send the negotiation compressed message; Receive the base station and receive and consult compressed message, judge whether to reduce compressed data packets according to self-ability; The result who judges is sent to the transmission base station.More than be description, in fact also have other machinery of consultation, can specifically not limit herein with reference to relevant way of consulting in the prior art to a kind of negotiations process.
Consulting by the NCP agreement in the process of compressed information, sending the parameter that comprises in the negotiation information that the base station sends and comprise: the compressing head number F_MAX_PERIOD that the CID space size NON_TCP_SPACE of the CID space size TCP_SPACE of TCP head, non-TCP head, twice entire header can send at most between sending, twice entire header any or several among maximum duration F_MAX_TIME, maximum compressible head length degree MAX_HEADER, length L ength, type Type and the IP compression protocol IP-Compression-Protocol between sending combination.Wherein, length L ength, type Type be the length of identification negotiations message and the type of negotiation message respectively, and IP compression protocol IP-Compression-Protocol is that to be generally 16 representative be the character of GTP compression in the value of present embodiment.
Referring to table 1, exemplify out the value of used each parameter in the present embodiment in the table 1; The form of the negotiation information that the transmission base station sends has comprised the parameter in the negotiation information in the table 1 referring to Fig. 7 in message format.
| Configuration item | Implication | Scope | Recommendation | Actual value |
| TCP_SPACE | The CID space size of |
0～255 | 15 | Do not exist |
| NON_TCP_SPACE | The CID space size of |
0～65535 | 15 | 16 |
| F_MAX_PERIOD | The compressing head number that between twice entire header sends, can send at most | 0 meaning is unrestricted | 256 | 100 |
| F_MAX_TIME | Maximum duration between twice entire header sends | 0 meaning is unrestricted | 5 | 5 seconds |
| MAX_HEADER | Maximum compressible head length degree | 168 | 60 bytes |
Table 1. is consulted the compressed information parameter configuration table
Receive the base station and receive the negotiation compressed information that sends the base station transmission, judge self have the ability can the GTP-U packet after receiving compression after, with the reduction of the GRP-U packet after the compression, therefore, receive the base station transmission and reply the negotiation compressed information to sending the base station.The transmission base station receives replys the negotiation compressed information, finishes and receive the negotiation compressed information step of base station.The method of consulting compressed information can have difference, and above literal is to wherein a kind of explanation of consulting compressed information.
Step Q2, sending the base station is to meet a plurality of GTP-U packets that transmit on ppp link with data encapsulation.
Wherein, step Q2 specifically is that the process that meets the GTP-U packet that transmits on ppp link can cause encapsulation process that difference is arranged because different business is carried out in described transmission base station with data encapsulation.Be primarily aimed at two kinds of business in the embodiment of the invention, i.e. professional the and VoIP business of general data.
When sending the base station is at the general data business data encapsulation to be become the process of GTP-U packet, referring to Fig. 8, comprising:
Steps A 1 sends the base station and receives the data message, the IP information of terminal and the UDP information packet together of terminal that comprise the terminal generation that terminal sends;
Steps A 2 sends the base station data message, IP information and the reorganization of UDP information that receives is formed user's face PDU;
Steps A 3 sends the base station user's face PDU that forms is formed T-PDU according to the GTP-U protocol encapsulation;
Steps A 4,, send the base station and added the GTP-U head in the T-PDU front, form G-PDU;
Steps A 5, in the G-PDU data, add UDP head and IP head by the path agreement, interpolation is by the GTP-U head, the pairing Context identifier CID of context that transport network layer IP head and transport network layer UDP head are formed is in the IP header information, the final GPT-U packet that forms, the composition diagram of described GTP-U packet can be still referring to Fig. 1.
Wherein, include the pairing Context identifier CID of context that complete transmission network layer UDP head, transport network layer IP head and GTP-U head are formed in the described IP head, identical transport network layer UDP head, transport network layer IP head and the context that the GTP-U head is formed are identical, and its CID is same 16 numeral.Also CID can be encapsulated in the head of transport network layer UDP.
Above description is at general data when professional, form the process of GTP-U packet, the forming process of GTP-U packet is similar in the forming process of GTP-U packet and the general data business in the VoIP business, referring to Fig. 9, comprise that step B1 is to step B5, difference is, in speech business, requirement to real-time is very high, so the speech frame that terminal need be produced is by RTP (Real-TimeTransport Protocol, RTP) reorganization, for the ease of understanding, the data message of regarding as by the data after the RTP reorganization in the general data business can carried out and steps A 3 data after the reorganization, A4, the operation that A5 is corresponding similar finally forms the operational GTP-U packet of VoIP.
In fact, among the step Q2, the method that data encapsulation is become the GTP-U packet in general data business and VoIP business is a prior art.
Step Q3 sends the base station according to the result after consulting, and will encapsulate in a plurality of GTP-U packets in back the 1st, the 102nd, the 203rd etc., and by that analogy, the GTP-U packet that is spaced apart 100 sends to the reception base station; Described the 1st, the 102nd, the 203rd GTP-U packet is according to the time sequencing that sends the GTP-U packet GTP-U packet to be limited.
Wherein, in step Q3, send the base station according to the result after consulting, promptly when sending the 1st packet, be to send complete GTP-U packet, when sending the 102nd packet, be the complete GTP-U packet that sends, what send complete GTP-U packet is 100 packets at every turn at interval.
Step Q4, send the value position GTP compression of base station according to the compressed information parameter I P compression protocol of consulting, with in described a plurality of GTP-U packets the 2nd to the 101st, the the 103rd to the 202nd IP head, UDP head and GTP-U header suppression that waits the GTP-U packet, described IP head, UDP head are the IP head and the UDP heads of transport network layer, and the GTP-U packet that the compression back is formed sends to the reception base station according to time sequencing.Wherein, include cid information in the GTP-U packet after the compression.
Send the base station and send 100 of GTP-U packets after the compression continuously, send unpressed complete GTP-U packet then, 100 of the GTP-U packets after the continuous once more transmission compression, by that analogy.The length of the CID that comprises in the GTP-U packet that sends is 16, and maximum duration was 5 seconds between twice entire header sent, and maximum compressible head length degree is 60 bytes.
In order clearly to understand among the step Q3 compression zone to the GTP-U packet, referring to shown in Figure 10, transport network layer IP head, transport network layer UDP head and GTP-U head in the unpressed GTP-U packet that on ppp link, sends, the three joins together to compress, the GTP-U packet that will compress back formation again sends to and receives the base station, saves transport overhead.Described transport network layer IP head and transport network layer UDP head are meant IP head and the UDP head that is not included among user's face PDU.GTP-U packet after the compression contains CID.In the literal of back, have the header format before and after the compression is elaborated.
Wherein, when complete GTP-U packet is not compressed in this transmission to the GTP-U packet to send the base station among step Q3, the Q4, when the implementation procedure of this transmission compressed data packet is to be: preserve counter in sending the base station, after not compressing complete GTP-U packet, transmission one begins counting, and, beginning counted data bag all sends the GTP-U packet after the compression, behind the GTP-U packet after sending 100 compressions, counter O reset, the transmission base station sends one again and does not compress complete GTP-U packet, and the rest may be inferred.
Step Q5, receive the base station and receive unpressed complete GTP-U packet and the GTP-U packet after the compression, according to the CID that comprises in information of consulting and the unpressed complete GTP-U packet, the GTP-U packet of reduction compression.
In step Q5, after the reception base station receives complete unpressed GTP-U packet, can set up the direct corresponding relation of complete context do not compress CID and CID representative in the GTP-U packet, described context comprises transport network layer IP head, transport network layer UDP head and GTP-U head.Receive CID and the CID that sends in the unpressed GTP-U packet in the GTP-U packet after the base station contrasts the compression that receives, if CID is identical, it is identical with context in the complete GTP-U packet that receives then to receive the context of GTP-U packet before not having compression that can judge after the compression base station, therefore, restore complete GTP-U packet.
Owing to send in the unpressed GTP-U packet of base station transmission, the a lot of information that must carry in order to satisfy protocol requirement are repetitions, for transmission base station that has connected and reception base station is nonsensical information, in order to reduce this unnecessary information occupied bandwidth, can adopt in the middle of sending complete unpressed GTP-U packet and send the GTP-U packet that compresses, thereby efficiency of transmission can be provided, reduce transport overhead.Wherein, the number of the GTP-U packet after the compression that sends in the middle of twice complete unpressed GTP-U packet can have the base station of transmission and receive base station negotiate.Negotiation result in the present embodiment is that the GTP-U packet after 100 compressions of transmission arrives the reception base station between two complete GTP-U packets of transmission.
Embodiment explains transport network layer IP head, transport network layer UDP head and GTP-U head in the complete GTP-U packet before not compressing below for a better understanding of the present invention.Before to each head explanation, please refer to table 2, understand four titles and explain.
| Invariant NOCHANGE | This territory does not allow any change, will resend full head if change |
| Variable quantity DELTA | This territory often changes, but variation is less usually, only fills in the difference of variation |
| Stochastic variable RANDOM | This territory is irregular changing often |
| Deducibility amount INFERRED | This territory can be calculated from existing information and be obtained |
Table 2. title is explained
Transport network layer IP head is the IP head that defines in by IPv4 in the GTP-U packet before not having compression, and the parameter that this IP head comprises has: version, header length, COS, total length, sign, sign, sheet skew, life span, agreement, stem verification and, former IP address and purpose IP address.Specifying of each parameter referring to table 3, and the form of each parameter in the GTP-U packet that comprises in the transport network layer IP head is referring to Figure 11.In the transmission base station that has connected and receive between the base station, be different except flags parameters in the transport network layer IP head of each GTP-U packet that sends, other parameter all is identical or can infers out.
| Version | Invariant NOCHANGE | Acquiescence |
| Header length | Invariant NOCHANGE | Acquiescence (its IP head length degree is 5, and unit is 32 bits) |
| COS | Invariant NOCHANGE | (may be acquiescence) |
| Total length | Deducibility amount INFERRED | Can be from extrapolating |
| Sign | Stochastic variable RANDOM | |
| Sign | Invariant NOCHANGE | Fragment message does not compress |
| The sheet skew | Invariant NOCHANGE | (one is decided to be zero) |
| Life span | Invariant NOCHANGE | (may be acquiescence) |
| Agreement | Invariant NOCHANGE | |
| The stem verification and | Deducibility amount INFERRED | (can infer out) |
| Source IP address | Invariant NOCHANGE | (acquiescence) |
| Purpose IP address | Invariant NOCHANGE | (acquiescence) |
Table 3.IPv4 full header parameter list
Do not have the compression before the GTP-U packet in transport network layer UDP head comprise parameter: source port number, destination slogan, length and UDP verification and.Referring to table 4, be the situation of the value of each parameter in the UDP full header.Referring to Figure 12, be the form of UDP full header, wherein, source port number, destination slogan, length and UDP verification and length all are 16 respectively.In the transmission base station that has connected and receive between the base station, in the transport network layer UDP head of each GTP-U packet that sends except verification with different, other parameter all is identical or can infers out.
| Source port number | Invariant NOCHANGE (DEF) |
| The destination slogan | Invariant NOCHANGE (DEF) |
| Length | Deducibility amount INFERRED |
| Verification and | Stochastic variable RANDOM, when being zero (unless, be invariant) |
Table 4.UDP full header parameter list
GTP-U full header in the GTP-U packet before not having compression, referring to Figure 13 is GTP-U full header form, comprises parameter: version, PT, E sign, S sign, PN sign, type of message, length field, Tunnel End Point Identifier, sequence number, N-PDU and next extension header type.To the description of each parameter referring to table 5.Wherein, the E sign is used to indicate whether exist the expansion header field, and the S sign is used to indicate whether to exist sequence number, the PN sign is used to indicate whether to exist N-PDU number, and version field is used to identify the version of GTP agreement, and PT is used to distinguish agreement, PT=1 is the GTP agreement, and PT=0 is a GTP ' agreement.Between transmission base station that has connected and reception base station, except the Tunnel End Point Identifier difference, other parameter all is identical or can infers out in the GTP-U head of each GTP-U packet that sends.
| Version | Invariant NOCHANGE | Acquiescence (DEF) |
| PT | Invariant NOCHANGE | Acquiescence (DEF) |
| E | Invariant NOCHANGE | |
| PN | Invariant NOCHANGE | |
| Type of message | Invariant NOCHANGE | |
| Length field | Deducibility amount INFERRED | |
| Tunnel End Point Identifier | Stochastic variable RANDOM | |
| Sequence number | Deducibility amount INFERRED | |
| N-PDU number | Invariant NOCHANGE | |
| Next extension header type | Invariant NOCHANGE |
Table 5.GTP-U full header parameter list
Between transmission base station that has connected and reception base station, during GTP-U packet of every transmission, all need transport network layer IP head, transport network layer UDP head and the GTP-U head of above explanation are all sent one time, in fact, the transmission that in most cases all repeats identical transport network layer IP head, transport network layer UDP head and GTP-U head, taken transmission bandwidth, made transport overhead big, efficiency of transmission is low.
Therefore, just will be in complete transport network layer IP head, transport network layer UDP head and the GTP-U head in the step Q3 of embodiment two in the GTP-U packet of each transmission constant parameter and the compression of parameters that can infer out, GTP-U packet after the compression is made up of unpressed part and compression section.Wherein, transport network layer IP head, transport network layer UDP head and GTP-U head are united the form after the compression, referring to Figure 14, the Context identifier CID (Context identifier) that comprises 16 accounts for 2 bytes, this CID of 16 represents to become two row in Figure 14, first row is the most-significant byte of these 16 CID, and second row is the least-significant byte of these 16 CID, the common Context identifier of forming one 16 of this two row.Wherein, the sign that comprises in the complete unpressed GTP-U packet that sends among this Context identifier and the step Q3 is identical, according to this Context identifier, receive the base station when decompressing, contrast the CID of the complete GTP-U packet that receives according to this Context identifier, restore this context, described context is by transport network layer IP head, and transport network layer UDP head and GTP-U head are formed.
The third line comprises the parameter T that indicates Tunnel End Point Identifier, the parameter I and the sequence of data packet Generation information of indication IPv4 sign, accounts for 1 byte altogether.The parameter I of the parameter T of indication Tunnel End Point Identifier and indication IPv4 sign is said below to attend the meeting and is understood easily, do not elaborate earlier herein.Corresponding each given Context identifier CID can bind with unique Generation, Generation can be understood as the sequence number of the GTP-U packet of transmission, the sequence number that sends first GTP-U packet is 1, and later every transmission has the GTP-U packet altogether and just increases progressively a sequence number.Generation is by complete head or the carrying of unpressed UDP stem.
Fourth, fifth, six row are respectively the parameters that changes in each GTP-U packet that sends in transport network layer UDP head, GTP-U head and the transport network layer IP head, are followed successively by: the UDP verification and, Tunnel End Point Identifier and IPv4 sign.Wherein, the UDP verification is optionally with leading to, and takies 2 bytes, because the ID of IPv4 is a change at random, so all carry this territory at every turn.When T was 1, the Tunnel End Point Identifier in the complete GTP-U head that sends before the Tunnel End Point Identifier of this GTP-U head being described and not compressing was inequality, so this GTP-U head need keep the Tunnel End Point Identifier of 4 bytes; If T is 0, the Tunnel End Point Identifier in the complete GTP-U head that sends before the Tunnel End Point Identifier of this GTP-U head being described and not compressing is identical, so the head after the compression can not comprise this parameter.Parameter I is similar to the effect of T, difference is, when I is 1, the IPv4 sign of this IP head is described and compress the preceding IPv4 sign that sends in the complete IP head not different, so this IP head need keep the IPv4 sign of 2 bytes, in like manner, can infer that I is at 0 o'clock, then the head after the compression can not comprise this parameter.
Therefore, can extrapolate, IP head, UDP head and GTP-U head are united compression, taking byte number altogether after this part compression is 5,7,9 or 11.When T be 0, when I is 0, the GTP-U/UDP/IP head that compression back forms is 5 bytes; When T is 1, I is 0 to be that the GTP-U/UDP/IP head that the compression back forms is 9 bytes; When T is 0, I is 1 to be that the GTP-U/UDP/IP head that the compression back forms is 7 bytes; When T is 1, I is 1 to be that the GTP-U/UDP/IP head that the compression back forms is 11 bytes.
It more than is explanation to the form after IP head, UDP head and the GTP-U header suppression, and do not have compressed portion still to keep original form in the GTP-U packet, be compressed the GTP-U packet after back part that forms of part compression and unpressed part are formed compression jointly.
More than from comparative illustration to before IP head, UDP head and the GTP-U header suppression and compression back form, as can be seen: the variable that all can change when having kept each transmission GTP-U packet in the form after the compression, as: UDP verification and, Tunnel End Point Identifier and IPv4 sign, with each constant amount or can infer that the amount that adopts simple code to replace, as: CID, by when sending complete GTP-U packet, also comprise described simple code, learn the complete information of described simple code representative.
The explanation of the transmission method by above a kind of data that the embodiment of the invention two is provided, on ppp link during dateout, by sending the base station and receiving the base station negotiate compressed information, send the base station according to the compressed information after consulting, with the IP head in the transport network layer in the GTP-U packet, UDP head and GTP-U header suppression, thereby saved transport overhead, improved efficiency of transmission.
The transmission method of a kind of data that the embodiment of the invention two provides is applicable to the transfer of data on ppp link, and the transmission method of a kind of data that the embodiment of the invention three provides is applicable to transmission requirement on the Ethernet.Be explanation below to the embodiment of the invention three.
Embodiment three, a kind of transmission method of data, and this method is applicable to Ethernet Ethernet, i.e. the situation of route networking.Dispensing device can be the base station in the embodiment of the invention three, and receiving system can be the base station, also can be the core network side apparatus, and promptly dispensing device and receiving system are the equipment at GTP tunnel two ends.For convenience the description of the transmission method of a kind of data that the embodiment of the invention three is provided thinks that dispensing device is to send the base station, and receiving system is to receive the base station, and referring to Figure 15, concrete steps comprise:
Described step F 1 is similar to the step Q1 in the embodiment of the invention two, step F 1 to the identical point of step Q1 is: negotiation parameter can be similar in the process of consulting compressed information to receiving the base station to send the base station, and negotiation parameter can comprise: the CID space size TCP_SPACE of TCP head, the CID space size NON_TCP_SPACE of non-TCP head, the compressing head number F_MAX_PERIOD that can send at most between twice entire header sends, maximum duration F_MAX_TIME between twice entire header sends, maximum compressible head length degree MAX_HEADER, length L ength, any one or several combination among type Type and the IP compression protocol IP-Compression-Protocol.Can be in the embodiment of the invention three with reference to the negotiation result among the embodiment two, promptly referring to the result who consults in the table 1.
At the Context identifier described in the step F 2 is the contextual CID that wireless network layer IP head, wireless network layer UDP head and GTP-U head are formed.
Wherein, the concrete encapsulation process of step F 2 is similar to the step Q2 in the embodiment of the invention two, in the embodiment of the invention three, also be primarily aimed at two kinds of business, it is the professional and VoIP business of general data, send the base station with the data encapsulation in described two kinds of business become the process of GTP-U packet can reference example two in to the description of step Q2, difference is: at first, embodiment three at be the situation of route networking, then the head in the GTP-U packet is the head of forming according to the Ethernet related protocol; Secondly, the contextual CID that formed by wireless network layer IP head, wireless network layer UDP head and GTP-U head of the CID that comprises in the GTP-U data packet transmission network layer IP head.The structure chart that sends the GTP-U packet of base station formation can be with reference to figure 2.The described method that data encapsulation in two kinds of business is become the GTP-U packet is a prior art.
Wherein, step F 3 is similar to step Q3.
In order clearly to understand in the step F 3 compression zone to the GTP-U packet, referring to Figure 16, under the route networking scene, GTP-U head, wireless network layer IP head and wireless network layer UDP head three in the unpressed GTP-U packet that sends joins together to compress, the GTP-U packet that the compression back is formed sends to the reception base station, saves transport overhead.The IP head of described wireless network layer and wireless network layer UDP head refer to the IP head and the UDP head that comprise in user's face PDU.
Wherein, because wireless network layer IP head, wireless network layer UDP head and transport network layer IP head, transport network layer UDP header format are corresponding similar with the parameter that comprises, therefore, send the base station with the GTP-U head, wireless network layer IP head is similar to the form among the embodiment two with the form after wireless network layer UDP head three joins together to compress, can with reference among the embodiment two to being compressed the description of the form after the part compression, be compressed the GTP-U packet after part that part compression back forms and unpressed part are formed compression jointly.
The explanation of the transmission method by above a kind of data that the embodiment of the invention three is provided, under the situation of route networking, by sending the base station and receiving the base station negotiate compressed information, send the base station according to the compressed information after consulting, with UDP head in IP head, the wireless network layer in the wireless network layer in the GTP-U packet and GTP-U header suppression, thereby saved transport overhead, improved efficiency of transmission.
The above embodiment of the invention the, two, the 3rd, the explanation of the method that the embodiment of the invention is provided, the embodiment of the invention also provides dispensing device and receiving system, below embodiment the four, five, the 6th, the description of the dispensing device that the embodiment of the invention is provided.
Embodiment four, and a kind of communication equipment referring to Figure 17, comprising: receiving element 10, encapsulation unit 20, transmitting element 30, negotiation element 40 and compression unit 50, wherein:
Receiving element 10 is used to receive that receiving system sends replys the negotiation compressed information, also is used for the data that receiving terminal sends;
Transmitting element 30 is used for sending the negotiation information compressed that negotiation element 40 produces, and sends unpressed complete GTP-U packet, sends the GTP-U packet after compressing.
It will be appreciated that, negotiation element 40 in a kind of communication equipment that the embodiment of the invention four provides also can be replaced by acquiring unit, promptly this device can not need to consult to obtain compressed information, described compressed information can be preserved in device in advance, when needs use, obtain described compressed information by acquiring unit, realize the function of this device jointly.
A kind of communication equipment that adopts the embodiment of the invention four to provide, consult compressed information by dispensing device and receiving system, dispensing device is according to the compressed information after consulting, perhaps, dispensing device is according to the compressed information that obtains in the acquiring unit, with IP head, UDP head and GTP-U header suppression in the GTP-U packet, thereby save transport overhead, improved efficiency of transmission.
A kind of communication equipment of describing in the above embodiment of the invention four is operated in the different networks, and the function of each module of this communication equipment has difference, comes the communication equipment that is operated in the heterogeneous networks is done explanation below in conjunction with specific embodiment.
Embodiment five, a kind of communication equipment, this device are applicable in the ppp link that this device can be a base station, also can be gateway SGW.Referring to Figure 18, this communication equipment comprises: first receiving element 101, first encapsulation unit 201, first transmitting element 301, first negotiation element 401 and first compression unit 501.
First receiving element 101, be used for the data that receiving terminal sends, the data that described terminal sends comprise the initial data that terminal produces, the IP information of terminal and the UDP information of terminal, first receiving element 101 sends to first encapsulation unit 201 with the data that the terminal that receives sends, first encapsulation unit 201 becomes this data encapsulation meet the GTP-U packet that transmits on ppp link, wherein, in the process of encapsulation Context identifier CID is encapsulated in the transport network layer IP head, described Context identifier CID is by transport network layer IP head, the contextual sign that transport network layer UDP head and GTP-U head are formed.First encapsulation unit 201 is carried out this data encapsulation is become the operation that meets the GTP-U packet that transmits on ppp link, can be after first negotiation element 401 and receiving system are consulted compressed information.
Described first transmitting element 301 is used for the information according to 401 negotiations of first negotiation element, send the complete GTP-U packet of first encapsulation unit, 201 encapsulation, GTP-U packet after transmission is compressed through first compression unit 501 sends and receives the negotiation information of consulting between the base station.
Description by a kind of communication equipment that the embodiment of the invention five is provided, consult compressed information by first negotiation element 401 in this communication equipment with receiving system, first compression unit 501 is according to the compressed information after consulting, with the IP head of transport network layer in the GTP-U packet, the UDP head and the GTP-U header suppression of transport network layer, thereby saved transport overhead, improved efficiency of transmission.
Embodiment five provides a kind of communication equipment on ppp link, and a kind of Ethernet Ethernet that is applicable to is provided in the embodiment of the invention six below, and promptly the communication equipment under the route network environment specifies referring to embodiment six.
Embodiment six, a kind of communication equipment, and this device is applicable to Ethernet Ethernet, i.e. route network environment, this device can be the base station, also can be base station controller.Referring to Figure 19, this communication equipment comprises: second receiving element 102, second encapsulation unit 202, second transmitting element 302, second negotiation element 402 and second compression unit 502.
In fact the device that provides in a kind of communication equipment that provides in the embodiment of the invention six and the embodiment of the invention five is similar, different is, the device that provides in the embodiment of the invention six is to be applied in the environment of route networking, the form of the GTP-U packet that encapsulation forms in described second encapsulation unit 202 is the form according to the agreement defined of route networking, form among difference and the embodiment five, form at the GTP-U packet of ppp link transmission, and, the Context identifier CID that encapsulates in transport network layer IP head in the process of encapsulation is by wireless network layer IP head, the contextual sign that wireless network layer UDP head and GTP-U head are formed; Agreement difference that in negotiations process, adopts in described second negotiation element Unit 401 and first negotiation element among the embodiment five; Described second compression unit 502 is according to the compressed message after consulting in second negotiation element 402, GTP-U head, wireless network layer IP head and wireless network layer UDP head in the GTP-U packet after the encapsulation in second encapsulation unit 202 are united compression, the GTP-U/UDPIP head that the compression back forms comprises the CID identical with encapsulation unit, and the GTP-U/UDP/P head that the compression back forms is 5,7,9 or 11 bytes.GTP-U packet after the final compression that forms is made up of GTP-U/UDP/IP head and unpressed part that the compression back forms.
The device that a kind of communication equipment that the embodiment of the invention six provides and embodiment five provide, remove difference described above, the composition module of the device that provides among the component units module of the device that embodiment six provides and the embodiment five is corresponding similar, the description in can reference example five.
Description by a kind of communication equipment that the embodiment of the invention six is provided, consult compressed information by second negotiation element 402 in this communication equipment with receiving system, second compression unit 502 is according to the compressed information after consulting, the IP head of wireless network layer in the GTP-U packet, the UDP head and the GTP-U head of wireless network layer are joined together to compress, thereby saved transport overhead, improved efficiency of transmission.
Embodiment seven, and a kind of receiving system, this receiving system can be the parts in the base station, can be the core net access devices also, referring to Figure 20, comprise the 3rd receiving element 60, the 3rd negotiation element 70, the 3rd transmitting element 80 and decompression unit 90.
The 3rd receiving element 60 is used for negotiation compressed information that transmission and reception apparatus sends, complete unpressed GTP-U packet and the GTP-U packet after the compression.The 3rd negotiation element 70 obtains the negotiation compressed information in the 3rd receiving element 60, consult with the self-ability contrast, the negotiation compressed information is replied in generation, will reply the negotiation compressed information and send to the 3rd transmitting element 80, will reply the negotiation compressed information by the 3rd transmitting element 80 and send to dispensing device.CID in the complete GTP-U packet that decompression unit 90 is used for receiving according to the negotiation result of the 3rd negotiation element 70 and the 3rd receiving element 60 in the IP head, with the reduction of the GTP-U packet after the compression that receives, the concrete steps of its reduction are: the CID in the GTP-U packet after the compression that will receive and the CID of the complete GTP-U packet that receives contrast, if two CID are identical, compression section is identical with context in the complete GTP-U packet in the GTP-U packet after then should compression, and the context that is about to Context identifier representative in the complete GTP-U packet is as the back reduction result of compression section in the GTP-U packet of compression.Wherein, if this device is communicated by letter with the opposite end on ppp link, then the context in the GTP-U packet of Jie Shouing is meant by transport network layer IP head, transport network layer UDP head and GTP-U head and forms, and can take the NCP agreement with the agreement that consult the opposite end; If this device is communicated by letter with the opposite end in the environment of route networking, then the context in the GTP-U packet of Jie Shouing is meant by wireless network layer IP head, wireless network layer UDP head and GTP-U head and forms, agreement present stage of consulting with the opposite end does not have unified agreement, but to adopt prior art be easy realization in negotiations process.
Description by a kind of receiving system that the embodiment of the invention seven is provided, the information of the complete GTP-U packet CID that decompression unit 90 receives according to the negotiation result of the 3rd negotiation element 70 and the 3rd receiving element 60, GTP-U packet after the compression of receiving is decompressed, thereby saved transport overhead, improved efficiency of transmission.
Need to prove, first negotiation element 401 in the device that embodiment five, six, seven provides respectively, second negotiation element 402, the 3rd negotiation element 70 can be replaced by first acquiring unit, second acquisition unit, the 3rd acquiring unit respectively, be not need to hold consultation in embodiment five, six, seven devices that provided, and, realize the function of each device to compression, transmission or the reduction of data by the compressed information that presets in the device or preserve.
More than be the description of device that the embodiment of the invention is provided, below explanation done by the system that the embodiment of the invention provides.
Embodiment eight, and a kind of communication system comprises dispensing device 11 and receiving system 12, referring to Figure 20.
Wherein, dispensing device 11 is used for consulting compressed information with receiving system 12, and described compressed information can comprise: maximum duration F_MAX_TIME, maximum compressible head length degree MAX_HEADER, length L ength, type Type and IP compression protocol IP-Compression-Protocol between the compressing head number F_MAX_PERIOD that the CID space size NON_TCP_SPACE of the CID space size TCP_SPACE of TCP head, non-TCP head, twice entire header can send at most between sending, twice entire header send.After dispensing device 11 was consulted to finish with receiving system 12, dispensing device 11 was used to encapsulate the GTP-U packet that meets transmission requirement, wherein CID was encapsulated in the GTP-U packet in the IP header information.Wherein, if dispensing device 11 is communicated by letter on ppp link with receiving system 12, the context of then described CID representative comprises transport network layer IP head, transport network layer UDP head and GTP-U head; If dispensing device 11 is communicated by letter in the environment of route networking with receiving system 12, the context of then described CID representative comprises wireless network layer IP head, wireless network layer UDP head and GTP-U head.
Receiving system 12 receives the negotiation message with dispensing device 11, complete GTP-U packet that transmission and reception apparatus 11 sends and the GTP-U packet after the compression, receiving system 12 is according to negotiation result and the complete GTP-U packet that receives, with the reduction of the GTP-U packet after the compression.Wherein, CID in CID that comprises in the GTP-U packet after the compression that receiving system 12 contrasts receive and the complete GTP-U packet, two CID are identical, then to judge compressed portion in this compression GTP-U packet identical with the context of CID representative in the complete GTP-U packet for receiving system 12, therefore, receiving system 12 can be with the GTP-U packet reduction of compression.
Description by above a kind of communication system that the embodiment of the invention eight is provided, dispensing device is by consulting compressed information with receiving system, identical part in the GTP-U packet that sends is comprised that IP head, UDP head and GTP-U head unite compression, receiving system is according to the compressed information of consulting, restore compressed data, thereby saved transport overhead, efficiency of transmission is provided.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, this program comprises the steps: when carrying out
With data encapsulation is a plurality of GTP-U packets;
With IP head, UDP head and the GTP-U header suppression in the part GTP-U packet in described a plurality of GTP-U packets, form the GTP-U packet after compressing, at least comprise the compression head that forms after described IP head, UDP head and the GTP-U header suppression in the GTP-U packet after the described compression, described compression head comprises Context identifier CID at least, wherein, described CID is identical with CID in the unpressed GTP-U packet that comprises identical IP head, UDP head and GTP-U head;
The GTP-U packet that forms after unpressed GTP-U packet and the described compression in described a plurality of GTP-U packets is sent to receiving system.
The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
More than transmission method, communication equipment and the communication system of a kind of data that the embodiment of the invention provided is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (20)
1, a kind of transmission method of data is characterized in that, comprising:
With data encapsulation is a plurality of GTP-U packets;
With IP head, UDP head and the GTP-U header suppression in the part GTP-U packet in described a plurality of GTP-U packets, form the GTP-U packet after compressing, at least comprise the compression head that forms after described IP head, UDP head and the GTP-U header suppression in the GTP-U packet after the described compression, described compression head comprises Context identifier CID at least, wherein, described CID is identical with CID in the unpressed GTP-U packet that comprises identical IP head, UDP head and GTP-U head;
The GTP-U packet that forms after unpressed GTP-U packet and the described compression in described a plurality of GTP-U packets is sent to receiving system.
2, method according to claim 1 is characterized in that, and is described with IP head, UDP head and GTP-U header suppression in the part GTP-U packet in described a plurality of GTP-U packets, forms the GTP-U packet after compressing, and specifically comprises:
According to the compressed information that obtains,, form the GTP-U packet after compressing with IP head, UDP head and the GTP-U header suppression in the part GTP-U packet in described a plurality of GTP-U packets.
3, method according to claim 1 is characterized in that, described the GTP-U packet that forms after unpressed GTP-U packet and the described compression in described a plurality of GTP-U packets is sent to receiving system, specifically comprises:
According to the compressed information that obtains, the GTP-U packet that forms after unpressed GTP-U packet and the described compression in described a plurality of GTP-U packets is sent to receiving system.
4, according to claim 2 or 3 described methods, it is characterized in that, also comprise before data encapsulation is a plurality of GTP-U packets: consult compressed information with receiving system described;
The compressed information that described basis is obtained is and the described result who consults compressed information with receiving system.
5, method according to claim 4 is characterized in that,
IP head, UDP head and GTP-U header suppression in the part GTP-U packet in described a plurality of GTP-U packets are specially:
According to the compressing head number that can send at most between twice full header transmission among the result of described negotiation compressed information, with the IP head in the part GTP-U packet in the described GTP-U data packet group, UDP head and GTP-U header suppression.
6, according to each described method of claim 1 to 3, it is characterized in that described compression head also comprises: sequence of data packet Generation, UDP verification and, Tunnel End Point Identifier, IPv4 sign, the parameter I of indication IPv4 sign and the parameter T of indication Tunnel End Point Identifier.
According to each described method of claim 1 to 3, it is characterized in that 7, described a plurality of GTP-U packets are a plurality of GTP-U packets that meet the ppp link transmission;
Described IP head in the part GTP-U packet in a plurality of GTP-U packets, UDP head and GTP-U header suppression are specifically comprised: with transport network layer IP head, transport network layer UDP head and GTP-U header suppression in the part GTP-U packet in a plurality of GTP-U packets.
According to each described method of claim 1 to 3, it is characterized in that 8, described a plurality of GTP-U packets are a plurality of GTP-U packets that transmit in the route network environment that meet;
Described IP head in the part GTP-U packet in a plurality of GTP-U packets, UDP head and GTP-U header suppression are specifically comprised: with wireless network layer IP head, wireless network layer UDP head and the GTP-U header suppression in the part GTP-U packet in a plurality of GTP-U packets.
9, a kind of transmission method of data is characterized in that, comprising:
Receive the GTP-U packet that unpressed GTP-U packet and compression back form, at least comprise Context identifier CID in the GTP-U packet that described compression back forms, wherein, described CID is identical with CID in the unpressed GTP-U packet that comprises identical IP head, UDP head and GTP-U head;
According to CID in the GTP-U packet of described reception compression back formation and the CID in the unpressed GTP-U packet of described reception, with the GTP-U packet reduction that forms after the described compression.
10, a kind of communication equipment is characterized in that, comprising:
Encapsulation unit, being used for data encapsulation is a plurality of GTP-U packets;
Compression unit, with IP head, UDP head and the GTP-U header suppression in the part GTP-U packet in a plurality of GTP-U packets after the described encapsulation, form the GTP-U packet after compressing, at least comprise the compression head that forms after described IP head, UDP head and the GTP-U header suppression in the GTP-U packet after the described compression, described compression head comprises Context identifier CID at least, described CID is identical with CID in the unpressed packet, is used for decompress GTP-U packet after the described compression of receiving system;
Transmitting element is used to send unpressed GTP-U packet, sends the GTP-U packet after compressing.
11, equipment according to claim 10 is characterized in that,
Described encapsulation unit, being used for data encapsulation is a plurality of GTP-U packets that transmit on the point-to-point protocol ppp link that meet, and comprises Context identifier CID in the described GTP-U packet;
Described compression unit, be used for transport network layer IP head, transport network layer UDP head and GTP-U header suppression in a plurality of GTP-U packet part GTP-U packets after the described encapsulation, form the GTP-U packet after compressing, at least comprise the compression head that forms after described transport network layer IP head, transport network layer UDP head and the GTP-U header suppression in the GTP-U packet after the described compression, described compression head comprises CID at least, and described CID is used for decompress GTP-U packet after the described compression of receiving system.
12, equipment according to claim 10 is characterized in that,
Described encapsulation unit, being used for data encapsulation is a plurality of GTP-U packets that transmit at the route network environment that meet, and comprises CID in the described GTP-U packet.
Described compression unit, be used for wireless network layer IP head, wireless network layer UDP head and GTP-U header suppression in a plurality of GTP-U packet part GTP-U packets after the described encapsulation, form the GTP-U packet after compressing, at least comprise the compression head that forms after described wireless network layer IP head, wireless network layer UDP head and the GTP-U header suppression in the GTP-U packet after the described compression, described compression head comprises CID at least, and described CID is used for decompress GTP-U packet after the described compression of receiving system.
13, equipment according to claim 12 is characterized in that, also comprises:
Negotiation element is used for consulting compressed information with receiving equipment, produces the result who consults compressed information;
Described compression unit, be used for according to the result who consults compressed information, with wireless network layer IP head, wireless network layer UDP head and the GTP-U header suppression in the part GTP-U packet in a plurality of GTP-U packets after the described encapsulation, form the GTP-U packet after compressing, at least comprise the compression head that forms after described wireless network layer IP head, wireless network layer UDP head and the GTP-U header suppression in the GTP-U packet after the described compression, described compression head comprises CID at least, and described CID is used for decompress GTP-U packet after the described compression of receiving system.
14, a kind of receiving system is characterized in that, comprising:
The 3rd receiving element is used for the GTP-U packet after transmission and reception apparatus sends unpressed GTP-U packet and compression, comprises CID in the described GTP-U packet for compression;
Decompression unit is used for according to the CID of the GTP-U packet that forms after the described reception compression and the CID in the unpressed GTP-U packet of described reception the GTP-U packet after the described compression being reduced.
15, device according to claim 14 is characterized in that, described device also comprises:
The 3rd negotiation element in holding consultation with dispensing device, produces the result who consults compressed information;
Described decompression unit is used for also according to the result who consults compressed information the GTP-U packet after the described compression being reduced.
16, a kind of communication system is characterized in that, comprising:
Dispensing device, being used for data encapsulation is a plurality of GTP-U packets, comprise Context identifier CID in the described GTP-U packet, with IP head, UDP head and GTP-U header suppression in the part GTP-U packet in described a plurality of GTP-U packets, form the GTP-U packet after compressing, at least comprise described CID in the GTP-U packet after the described compression, send GTP-U packet after unpressed GTP-U packet and the described compression to receiving system;
Receiving system, GTP-U packet after being used to receive described unpressed GTP-U packet and compress, according to CID in the GTP-U packet of described reception compression back formation and the CID in the unpressed GTP-U packet of described reception, the GTP-U packet after the described compression is reduced.
17, system according to claim 16, it is characterized in that, described dispensing device, being used for data encapsulation is a plurality of GTP-U packets that transmit on ppp link that meet, comprise Context identifier CID in the described GTP-U packet, with transport network layer IP head in the part GTP-U packet in described a plurality of GTP-U packets, transport network layer UDP head and GTP-U header suppression, form the GTP-U packet after compressing, at least comprise described CID in the GTP-U packet after the described compression, send GTP-U packet after unpressed GTP-U packet and the described compression to receiving system.
18, system according to claim 16, it is characterized in that, described dispensing device, being used for data encapsulation is a plurality of GTP-U packets that transmit at the route network environment that meet, comprise Context identifier CID in the described GTP-U packet, with wireless network layer IP head in the part GTP-U packet in described a plurality of GTP-U packets, wireless network layer UDP head and GTP-U header suppression, form the GTP-U packet after compressing, at least comprise described CID in the GTP-U packet after the described compression, send GTP-U packet after unpressed GTP-U packet and the described compression to receiving system.
According to each described system of claim 16 to 18, it is characterized in that 19, described dispensing device also is used for consulting compressed information with receiving system;
Described dispensing device, also be used for wherein any or all information of compressing head number that twice entire header according to the result who consults compressed information can send at most between sending or twice entire header maximum duration between sending, the GTP-U packet that forms after unpressed GTP-U packet and the described compression in described a plurality of GTP-U packets is sent to receiving system.
According to each described system of claim 16 to 18, it is characterized in that 20, described dispensing device also is used for consulting compressed information with receiving system;
Described receiving system, be used for also wherein any or several of compressing head number, length L ength, type Type and internet ip compression protocol that twice entire header according to the result who consults compressed information can send at most between sending combination, the GTP-U packet after the described compression is reduced.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810042023 CN101350812B (en) | 2008-08-22 | 2008-08-22 | Data transmission method, communication apparatus and communication system |
| PCT/CN2009/073439 WO2010020197A1 (en) | 2008-08-22 | 2009-08-24 | Data transmission method, communication equipment and communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810042023 CN101350812B (en) | 2008-08-22 | 2008-08-22 | Data transmission method, communication apparatus and communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101350812A true CN101350812A (en) | 2009-01-21 |
| CN101350812B CN101350812B (en) | 2012-06-27 |
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| CN101350812B (en) | 2012-06-27 |
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