CN101227224B - Method for implementing all network frame synchronization of WIMAX system - Google Patents
Method for implementing all network frame synchronization of WIMAX system Download PDFInfo
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- CN101227224B CN101227224B CN2007100009773A CN200710000977A CN101227224B CN 101227224 B CN101227224 B CN 101227224B CN 2007100009773 A CN2007100009773 A CN 2007100009773A CN 200710000977 A CN200710000977 A CN 200710000977A CN 101227224 B CN101227224 B CN 101227224B
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Abstract
The invention discloses a method for realizing WIMAX system whole net frame synchronization, which comprises following steps: obtaining system time by a clock board, reporting the system time which is obtained to a communication channel board timely, sending 1pps interrupt signals which are generated to the communication channel board, producing self 1.25ms interruption which takes the 1pps interrupt signals as basis by the clock board, obtaining the number of the 1.25ms interruption according to the obtained system time by the communication channel board, and adding with the number of the self 1.25ms interruption of the communication channel board to obtain the absolute frame number. The whole net frame synchronization which is required by the 802.16e is solved through applying the method of the invention and thereby communication of the WIMAX radio system between BTS and normal operations of the WIMAX radio system can be realized.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to a kind of method of the WIMAX of realization system whole-network frame synchronization.
Background technology
WIMAX (World Interoperability for Microwave Access, World Interoperability for Microwave Access, WiMax) is a kind of emerging wireless communication technology, can provide towards the high speed of the Internet to connect.The transmission of wireless signals distance of WIMAX can reach 50 kilometers farthest, and its network coverage area is 10 times of NodeB.WIMAX is based on broadband wireless access metropolitan area network (Broadband Wireless Access Metropolitan Area Network, the BWAMAN) technology of IEEE 802.16 standards.WIMAX also often is called as IEEE Wireless MAN (Metropolitan Area Network), and its elementary object provides a kind of under some multivendor environment to multiple spot of metropolitan area network, effectively the broadband wireless access means of interoperability.The technical advantage of WIMAX can brief overview be following some: the bottleneck restriction of long transmission distance, access speed height, nothing " last kilometer ", provide multimedia communication service widely.
In WIMAX, GSM, three kinds of digital mobile cellular telecommunication technical systems of CDMA, adopt different simultaneous techniquess: GSM to adopt the FDMA/TDMA technology, there is not the requirement of strictness the time, its general ground synchronous mode that adopts, extract reference synchronization from transmission signals, gsm system generally has strict synchronous requirement to transmission network; CDMA net synchronously mainly based on GPS (Global Position System) (GPS), Guang Bo reference signal makes between the wireless base station and portable terminal keeps synchronous via satellite, this just require cdma network must have height accurately synchronizing signal support; The WIMAX net adopts the OFDMA modulation technique, its simultaneous techniques and CDMA are similar, also be based on GPS (Global Position System) (GPS), Guang Bo reference signal makes and keeps synchronously with portable terminal between the wireless base station via satellite, its difference is, it is synchronous that CDMA carries out the whole network with system time, and it is synchronous that WIMAX then adopts frame number to carry out the whole network according to the 802.16e agreement.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method of the WIMAX of realization system whole-network frame synchronization, solving the desired the whole network frame synchronization of 802.16e, thereby guarantees that the WIMAX wireless system strides the normal operation of communication and WIMAX wireless system between BTS.
In order to solve the transferring technology problem, the invention provides a kind of method of the WIMAX of realization system whole-network frame synchronization, comprise the steps:
(1) clock board obtains system time;
(2) clock board regularly reports channel board with the described system time that obtains, and the 1pps interrupt signal of its generation is sent to channel board;
(3) channel board is the 1.25ms interruption that benchmark produces himself with the 1pps interrupt signal;
(4) channel board obtains the number that 1.25ms interrupts according to the system time that obtains, and obtains absolute frame number with number addition that the 1.25ms of described channel board self interrupts.
Wherein, also comprise step (5), whether channel board is added up the number that 1.25ms between two 1pps interrupt signals interrupts, lose to judge the 1.25ms interrupt number.
Wherein, in the described step (2), clock board reported the primary system time every one second.
Wherein, in the described step (2), system time is reported channel board in the mode of message by network interface.
Wherein, in the described step (2), the 1pps interrupt signal is sent to channel board by backboard.
Wherein, the 1.25ms described in the step (3) interrupts aliging with the 1pps interrupt signal.
Wherein, described alignment is meant that 1.25ms interrupts and the edge of 1pps interrupt signal is that synchronization produces.
Wherein, described system time is accurate to a second level.
Wherein, the 1.25ms of described channel board self interrupts automatic clear after each 1pps interrupt signal arrives.
A kind of method that realizes WIMAX system whole-network frame synchronization of the present invention has solved the desired the whole network frame synchronization of 802.16e, thereby has guaranteed that the WIMAX wireless system strides between BTS the normal operation of communication and WIMAX wireless system.
Description of drawings
Fig. 1 is the centralized network structural representation according to the described WIMAX of embodiment of the invention system;
Fig. 2 is the distributed network structure schematic diagram according to the described WIMAX of embodiment of the invention system;
Fig. 3 is the base band frame structural representation according to base station transceiver in the described WIMAX of the embodiment of the invention system;
Fig. 4 is the method flow schematic diagram according to the described a kind of WIMAX of the realization system whole-network frame synchronization of the embodiment of the invention;
Fig. 5 obtains TOD time method schematic flow sheet according to the described GPS of the embodiment of the invention;
Fig. 6 is according to the described schematic flow sheet that carries out the frame synchronization alarm when the GPS of BTS or BSC module is wrong of the embodiment of the invention;
Fig. 7 is according to the described schematic flow sheet that interrupts carrying out when making a mistake the frame synchronization alarm as 1.25ms of the embodiment of the invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
With reference to figure 1, be the centralized network structural representation of the described WIMAX of embodiment of the invention system.The network configuration of WIMAX system has centralized and distributed two kinds, and the present invention is at the centralized network structure.The centralized network structure is because at BSC (Base Station Controller, base station controller) hangs a plurality of BTS (Base Transceiver Station, base station transceiver) down, can realize switching, therefore functions such as roaming need carry out the whole network frame synchronization.The distributed network structure of WIMAX system is referring to Fig. 2.
With reference to figure 3, be the base band frame structural representation of base station transceiver in the described WIMAX of the embodiment of the invention system.Two veneers are arranged: clock board CPS and baseband board BCS in the base band frame of BTS.Wherein, clock board produces the 1pps interrupt signal and reports the TOD time, and the described TOD time is contained in gps time, and a lot of contents are arranged in the gps time, therefrom extracts valuable temporal information, and it is referred to as TOD (time of date).The TOD time reports channel board software by network interface in the mode of software message.The 1pps interrupt signal is input in the channel board logic by backboard, and the channel board logic can produce the 1.25ms interruption with the 1pps signal alignment, and transparent transmission 1pps interrupt signal, reporting channel plate software.Described alignment is meant that 1.25ms interrupts and the edge of 1pps interrupt signal is to produce at synchronization.
As shown in Figure 4, be the described a kind of method schematic diagram of realizing WIMAX system whole-network frame synchronization of the embodiment of the invention.This method can be specially following step:
Step 410: clock board obtains system time.
Step 420: clock board regularly reports channel board with the described system time that obtains, and the 1pps interrupt signal of its generation is sent to channel board.
Step 430: channel board is the 1.25ms interruption that benchmark produces himself with the 1pps interrupt signal.Guarantee that from hardware logic 1.25ms interrupts and the 1pps interrupt signal is alignd.
Step 440: channel board obtains the number that 1.25ms interrupts according to the system time that obtains, and to obtain with 1.25ms with number addition that the 1.25ms of described channel board self interrupts be the absolute frame number of benchmark.
The frame of WIMAX mobile system is that every 1.25ms comes a frame, receive and dispatch is basic chronomere with 1.25ms all, clock board reports the TOD time one time every 1s, channel board is calculated the number that 1.25ms interrupts according to the TOD time that reports, gps time is accurate to a second level, but the 1pps interruption is accurately to trigger, the 1.25ms of channel board interrupts meeting automatic clear after each 1pps interrupts arriving, the TOD Time Calculation that reports according to GPS of channel board draws the number that 1.25ms interrupts like this, number adding that self 1.25ms that channel board is by the 1pps interrupt signal that benchmark produced interrupts just can obtain absolute frame number.Because gps clock is the time reference of a global synchronization, be the frame number that benchmark produces with it, be exactly an absolute frame number that the whole network is synchronous.
In addition, channel board will be added up the interrupt number of 1.25ms between two 1pps interrupt signals, judges whether to occur the phenomenon that the 1.25ms interruption is lost.The GPS state that also can regularly detect BTS and BSC is to guarantee the whole network frame synchronization.
No matter whole WIMAX system is BTS or the frame number of BSC, all is to use with a kind of method to obtain by GPS, has realized the frame synchronization of the whole network, thereby has also just guaranteed switching, the realization of functions such as roaming.
With reference to figure 5, for the described GPS of the embodiment of the invention obtains TOD time method schematic flow sheet.Specifically comprise the steps:
Step 501: the GPS receiver in the GPS module is carried out initialization.
Step 502:GPS module timed sending GPS message is to CPU.
The serial ports interrupt routine of step 503:CPU resolves whether the message that receives is legal GPS message, if, enter step 505, if not, step 504 entered.
Step 504: make discard processing.
Step 505:GPS module judges whether to comprising the GPS message of TOD, if, enter step 507, if not, step 506 entered.
Step 506: do other processing.
Step 507: the GPS message that comprises TOD is resolved.
Step 508:GPS module judges whether to be effective TOD, if, enter step 510, if not, step 509 entered.
Step 509: report to the police.
Step 510: TOD is sent to channel board,
1pps belongs to two different physical channels with TOD in the GPS processing module.The initialization of GPS receiver is no matter be that 1pps output is all arranged before initialization or after the initialization, and just the output of 1pps is only accurately after the GPS normal initialization.The GPS receiver is exported TOD to clock board according to initialized parameter value (output time spacing frequency).Clock board sends it to channel board after guaranteeing that it correctly.
With reference to figure 6, be the described schematic flow sheet that interrupts carrying out when making a mistake the frame synchronization alarm as 1.25ms of the embodiment of the invention.Specifically comprise the steps:
Step 610: add up the number that two 1.25ms between the 1pps interruption interrupt.
Step 620: judge whether two 1.25ms interrupt numbers between the 1pps interruption are 1600, if, enter step 610, if not, step 630 entered.
Step 630: alarm reports an error.
With reference to figure 7, when the GPS of BTS or BSC module is wrong, carry out the schematic flow sheet of frame synchronization alarm for the embodiment of the invention is described.Specifically comprise the steps:
Step 710: whether the gps clock of judging BTS is correct, if, enter step 720, if not, step 730 entered.
Step 720: whether the gps clock of judging BSC is correct, if, enter step 710, if not, step 730 entered.
Step 730: alarm reports an error.
In sum, the whole network frame synchronization mechanism has been realized the whole network frame synchronization of the desired WIMAX mobile system of 8.16e agreement, and in product, actual application has been arranged, can satisfy the requirement of miscellaneous service to the whole network frame synchronization.
The method of the invention has solved the whole network frame synchronization that 802.16e requires, and then has realized the paging of WIMAX wireless communication system according to the 802.16e agreement, switches and function such as feedback fast, has realized the roaming function of WIMAXXT.Owing to realized the whole network frame synchronization, therefore guaranteed the signal Synchronization when multicast between WIMAX system different base station.
Claims (9)
1. a method that realizes WIMAX system whole-network frame synchronization is characterized in that, comprises the steps:
(1) clock board obtains system time based on GPS (Global Position System) GPS;
(2) clock board regularly reports channel board with the described system time that obtains, and the 1pps interrupt signal of its generation is sent to channel board;
(3) channel board is the 1.25ms interruption that benchmark produces himself with the 1pps interrupt signal;
(4) channel board obtains the number that 1.25ms interrupts according to the system time that obtains, and obtains absolute frame number with number addition that the 1.25ms of described channel board self interrupts.
2. the method for claim 1 is characterized in that, also comprises step (5), and whether channel board is added up the number that 1.25ms between two 1pps interrupt signals interrupts, lose to judge the 1.25ms interrupt number.
3. the method for claim 1 is characterized in that, in the described step (2), clock board reported the primary system time every one second.
4. method as claimed in claim 3 is characterized in that, in the described step (2), by network interface system time is reported channel board in the mode of message.
5. the method for claim 1 is characterized in that, in the described step (2), by backboard the 1pps interrupt signal is sent to channel board.
6. the method for claim 1 is characterized in that, the 1.25ms described in the step (3) interrupts aliging with the 1pps interrupt signal.
7. method as claimed in claim 6 is characterized in that, described alignment is meant that 1.25ms interrupts and the edge of 1pps interrupt signal is to produce at synchronization.
8. the method for claim 1 is characterized in that, described system time is accurate to a second level.
9. the method for claim 1 is characterized in that, the 1.25ms of described channel board self interrupts automatic clear after each 1pps interrupt signal arrives.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100009773A CN101227224B (en) | 2007-01-17 | 2007-01-17 | Method for implementing all network frame synchronization of WIMAX system |
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| CN2007100009773A CN101227224B (en) | 2007-01-17 | 2007-01-17 | Method for implementing all network frame synchronization of WIMAX system |
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| CN101227224A CN101227224A (en) | 2008-07-23 |
| CN101227224B true CN101227224B (en) | 2011-06-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101400141B (en) * | 2008-10-15 | 2010-06-09 | 中兴通讯股份有限公司 | Method and system for keeping data channel synchronization in WIMAX service |
| CN112235096B (en) * | 2020-09-08 | 2023-05-05 | 高新兴物联科技股份有限公司 | Data communication method, data receiving method and device and data sending method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6363084B1 (en) * | 1997-11-29 | 2002-03-26 | Daewoo Electronics Co. Ltd. | Method for estimating coarse frequency offset in OFDM receiver and apparatus employing the same |
| WO2004049618A1 (en) * | 2002-11-26 | 2004-06-10 | Electronics And Telecommunications Research Institute | Method and apparatus for embodying and synchronizing downlink signal in mobile communication system and method for searching cell using the same |
| CN1855915A (en) * | 2005-04-20 | 2006-11-01 | 华为技术有限公司 | Method for obtaining immediate system lime in worldwide interactive microwave access apparatus |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6363084B1 (en) * | 1997-11-29 | 2002-03-26 | Daewoo Electronics Co. Ltd. | Method for estimating coarse frequency offset in OFDM receiver and apparatus employing the same |
| WO2004049618A1 (en) * | 2002-11-26 | 2004-06-10 | Electronics And Telecommunications Research Institute | Method and apparatus for embodying and synchronizing downlink signal in mobile communication system and method for searching cell using the same |
| CN1855915A (en) * | 2005-04-20 | 2006-11-01 | 华为技术有限公司 | Method for obtaining immediate system lime in worldwide interactive microwave access apparatus |
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