WO2020168566A1

WO2020168566A1 - Message sending method and apparatus in random access process, and device and system

Info

Publication number: WO2020168566A1
Application number: PCT/CN2019/075942
Authority: WO
Inventors: 江小威
Original assignee: 北京小米移动软件有限公司
Priority date: 2019-02-22
Filing date: 2019-02-22
Publication date: 2020-08-27
Also published as: CN109983829B; CN109983829A

Abstract

The present invention relates to the field of communications, and relates to a message sending method and apparatus in a random access process, and a device and a storage medium. The method comprises: a terminal sends a message A to an access network device; the terminal receives scheduling information sent by the access network device by using RA-RNTI addressing, wherein the scheduling information is used for scheduling a time-frequency resource location of a message B; the terminal receives, according to the scheduling information, the message B sent by the access network device; and when determining that the message B is a message separately sent to the terminal, the terminal sends HARQ feedback of the message B to the access network device. The present invention can solve the problem that an HARQ mechanism cannot be used when multiple RARs are multiplexed into one MAC PDU transmission.

Description

Message sending method, device, equipment and system for random access process

Technical field

The present disclosure relates to the field of communications, and in particular to a method, device, equipment and system for sending messages in a random access process.

Background technique

The random access process refers to the process from the terminal sending a random access preamble to try to access the network side to the process before a basic signaling connection is established with the network side.

In the Long Term Evolution (LTE) and New Radio (NR) protocols of the Third Generation Partnership Project (Third Generation Partnership Project, 3GPP), the random access response (Random Access) in the random access process Response, RAR) packets are relatively small. The base station multiplexes the RARs issued to multiple terminals (User Equipment, UE) in a Medium Access Control Protocol Data Unit (MAC PDU) for transmission. Reduce downlink overhead.

However, the above multiplexing process will cause the problem that RAR cannot use the Hybrid Automatic Repeat reQuest (HARQ) mechanism.

Summary of the invention

The embodiments of the present disclosure provide a message sending method, device, device and system for the random access process, which can solve the problem that the base station multiplexes the RAR issued to multiple terminals in one MAC PDU and sends it, causing the RAR to fail to use the HARQ mechanism The problem. The technical solution is as follows:

In one aspect, a method for sending messages in a random access process is provided, and the method includes:

The terminal sends a message A to the access network device;

The terminal receives the scheduling information addressed and sent by the access network device using the Random Access Radio Network Temporary Identifier (RA-RNTI), and the scheduling information is used to schedule the time-frequency resource of the message B position;

The terminal receives the message B sent by the access network device according to the scheduling information;

When the terminal determines that the message B is a message separately sent to the terminal, it sends a hybrid automatic repeat request (Hybrid Automatic Repeat request, HARQ) feedback of the message B to the access network device.

In an optional implementation manner, when the terminal determines that the message B is a message separately sent to the terminal, sending the HARQ feedback of the message B to the access network device includes:

The terminal obtains first identification information from the scheduling information;

When the first identification information of the terminal is the same as the UE (User Equipment, UE) ID of the terminal, or when the first identification information is the same as the truncated UE ID, It is determined that the message B is a message separately sent to the terminal.

In an optional implementation manner, the first identification information includes:

Temporary mobile subscriber identity (Serving-Temporary Mobile Subscriber Identity, S-TMSI);

Or, Cell Radio Network Temporary Identifier (C-RNTI);

Or, the first random number;

Or, the truncated S-TMSI;

Or, the truncated first random number;

Wherein, the S-TMSI and the first random number are the initial UE ID of the terminal.

The terminal obtains second identification information from the scheduling information;

When the second identification information corresponds to the information in the message A, the terminal determines that the message B is a message separately sent to the terminal.

In an optional implementation manner, the second identification information includes:

The sequence identifier preamble ID corresponding to the random access preamble sequence carried in the message A; or, the second random number.

In an optional implementation manner, the method further includes:

The terminal generates a first random number and adds it to the message A;

Or, the terminal generates a second random number and adds it to the message A;

Or, the terminal generates the first random number, truncates the first random number to form the second random number and adds it to the message A;

Or, the terminal generates the first random number and the second random number, and adds the first random number and the second random number to the message A;

Wherein, the number of bits of the first random number is greater than the number of bits of the second random number.

In another aspect, a message sending method in a random access process is provided, and the method includes:

The access network device receives the message A sent by the terminal;

When message B needs to be scheduled using RA-RNTI, the access network device generates scheduling information addressed by the RA-RNTI, and the scheduling information is used to schedule the time-frequency resource location of the message B;

The access network device separately sends the message B to the terminal using the HARQ mechanism.

In an optional implementation manner, the generation of the scheduling information addressed by the RA-RNTI by the access network device includes:

The access network device generates scheduling information that carries first identification information, where the first identification information is the UE ID of the terminal, or the first identification information is the UE ID after truncation;

The access network device uses the RA-RNTI to scramble the scheduling information.

S-TMSI;

Or, C-RNTI;

Or, the first random number;

Or, the truncated S-TMSI;

Or, the truncated first random number;

The access network device generates scheduling information that carries second identification information, where the second identification information corresponds to the information in the message A;

The sequence identifier preamble ID corresponding to the random access preamble sequence carried in the message A;

Or, the second random number.

In an optional implementation manner, the method further includes:

Obtaining the second random number from the message A;

Or, obtaining a first random number from the message A, and truncating the first random number to the second random number.

In an optional implementation manner, the method further includes:

When the message A carries the first common control channel (common control channel, CCCH) service data unit (Service Data Unit, SDU), it is determined that the message B needs to use the RA-RNTI scheduling.

In an optional implementation manner, the method further includes: when the C-RNTI of the terminal is not carried in the message A, and the message B does not need to fall back to the message 2 in the four-step random access process, determining Message B needs to use the RA-RNTI scheduling.

In another aspect, a message sending device in a random access process is provided, and the device includes:

The sending module is configured to send message A to the access network device;

The receiving module is configured to receive the scheduling information addressed and sent by the access network device using the random access wireless network temporary identifier RA-RNTI, where the scheduling information is used to schedule the time-frequency resource location of the message B;

The receiving module is configured to receive the message B sent by the access network device according to the scheduling information;

The sending module is configured to send a hybrid automatic repeat request HARQ feedback of the message B to the access network device when it is determined that the message B is separately sent to the terminal.

In an optional implementation manner, the device further includes

A processing module configured to obtain first identification information from the scheduling information;

The processing module is configured to determine when the first identification information is the same as the UE ID of the terminal, or when the terminal is the same as the UE ID after truncation The message B is a message sent to the terminal separately.

Temporary mobile user identification S-TMSI;

Or, the cell radio network temporary identifier C-RNTI;

Or, the first random number;

Or, the truncated S-TMSI;

Or, the truncated first random number;

In an optional implementation manner, the processing module is configured to obtain second identification information from the scheduling information;

The processing module is configured to determine that the message B is a message separately sent to the terminal when the second identification information corresponds to the information in the message A.

Or, the second random number.

In an optional implementation manner, the processing module is configured to generate a first random number and add it to the message A;

Or, the processing module is configured to generate a second random number and add it to the message A;

Or, the processing module is configured to generate the first random number, shorten the first random number to form the second random number, and add it to the message A;

Or, the processing module is configured to generate the first random number and the second random number, and add the first random number and the second random number to the message A;

The receiving module is configured to receive message A sent by the terminal;

The processing module is configured to generate scheduling information addressed by the RA-RNTI when the message B needs to be scheduled using RA-RNTI, and the scheduling information is used to schedule the time-frequency resource location of the message B ；

The sending module is configured to separately send the message B to the terminal using the HARQ mechanism.

In an optional implementation manner, the processing module is configured to generate scheduling information that carries first identification information, where the first identification information is the UE ID of the terminal, or the first identification information Is the UE ID after truncation;

The processing module is configured to use the RA-RNTI to scramble the scheduling information.

S-TMSI;

Or, C-RNTI;

Or, the first random number;

Or, the truncated S-TMSI;

Or, the truncated first random number;

In an optional implementation manner, the processing module is configured to generate scheduling information carrying second identification information, where the second identification information corresponds to the information in the message A;

The processing module uses the RA-RNTI to scramble the scheduling information.

Or, the second random number.

In an optional implementation manner, the processing module is configured to obtain the second random number from the message A;

Or, the processing module is configured to obtain a first random number from the message A, and shorten the first random number to the second random number.

Optionally, the processing module is configured to determine that the message B needs to use the RA-RNTI scheduling when the message A carries the first common control channel service data unit CCCH SDU.

Optionally, the processing module is configured to determine that when message A does not carry the C-RNTI of the terminal and message B does not need to fall back to message 2 in the four-step random access process, it is determined that message B needs to use all The RA-RNTI scheduling is described.

In another aspect, a terminal is provided, and the terminal includes:

processor;

A transceiver connected to the processor;

A memory for storing processor executable instructions;

Wherein, the processor is configured to load and execute the executable instructions to implement the message sending method in the random access process executed by the access network device in the above aspect.

In another aspect, an access network device is provided, and the access network device includes:

processor;

A transceiver connected to the processor;

A memory for storing processor executable instructions;

In another aspect, a computer-readable storage medium is provided, and the computer-readable storage medium stores at least one instruction, at least one program, code set or instruction set, the at least one instruction, the at least one program, The code set or instruction set is loaded and executed by the processor to implement the message sending method in the random access process as described above.

The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

In the 2-step random access process, when the access network device determines that it needs to use RA-RNTI to schedule message B, it sends message B separately to the terminal. Therefore, the HARQ mechanism can be used to receive the terminal’s feedback on message B to avoid In the RA-RNTI scheduling scenario, the RARs of multiple terminals are multiplexed into the same MAC PDU for transmission, thereby solving the problem that the HARQ mechanism cannot be used for the message B scheduled by the RA-RNTI in the related technology.

It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure.

Description of the drawings

The drawings herein are incorporated into the specification and constitute a part of the specification, show embodiments in accordance with the disclosure, and together with the specification are used to explain the principle of the disclosure.

Figure 1 is a flow chart of the four steps of a contention-based random access process;

Figure 2 is a flow chart of two steps in a non-contention based random access process;

Figure 3 is a flow chart of two steps of a contention-based random access process;

Fig. 4 is a schematic diagram of a communication system to which an exemplary embodiment of the present disclosure may be applicable;

Fig. 5 is a flowchart showing a method for sending a message in a random access process according to an exemplary embodiment;

Fig. 6 is a flowchart showing a message sending method of a random access process according to another exemplary embodiment;

Fig. 7 is a flowchart showing a message sending method of a random access process according to another exemplary embodiment;

Fig. 8 is a block diagram showing a message sending device in a random access process according to an exemplary embodiment;

Fig. 9 is a block diagram showing a terminal according to an exemplary embodiment;

Fig. 10 is a block diagram showing an access network device according to an exemplary embodiment.

detailed description

Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure. Rather, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

The random access process refers to the process from the user sending the random access preamble sequence to try to access the network until the basic signaling connection is established with the network. The random access process is one of the most basic requirements for any cellular communication system. 1. It is used to establish data communication between the terminal and the network side.

The random access process is divided into: contention-based random access process and non-competition-based random access process. Figure 1 shows that in the contention-based random access process, the 4 steps of the random access process include:

(1) The terminal sends message 1: random access preamble to the access network device.

The terminal sends a random access preamble sequence (preamble) to the access network device, and the access network device estimates the transmission delay of the terminal based on this to achieve uplink synchronization.

(2) The access network device sends a message 2: Random Access Response (RAR) to the terminal.

The access network device sends a timing advance command based on the transmission delay estimated in the first step above to adjust the sending time of the terminal. Message 2 is organized by the Media Access Control (MAC) layer of the access network equipment and carried by the Down Link Share Channel (DL_SCH). A message 2 can respond to random access of multiple terminals at the same time request.

The access network equipment uses the Physical Downlink Control Channel (PDCCH) to schedule message 2, and it is addressed through C-RNTI or RA-RNTI (also called scrambling). RA-RNTI is determined by the physical randomness of message 1. The time-frequency resource location of the physical random access channel (PRACH) is determined. Message 2 contains the uplink transmission timing advance and allocates uplink resources and temporary C-RNTI for message 3.

(3) The terminal sends a message 3: the first scheduled transmission to the access network device.

After receiving the message 2, the terminal transmits the message 3 on the allocated uplink resources, and sends the user equipment (User Equipment Identify, UE ID) to the access network device through the uplink shared channel (Up Link Share Channel, UL_SCH).

Optionally, the message 3 includes a common control channel (CCCH) service data unit (Service Data Unit, SDU), which is used for the message 4 to carry the contention resolution ID.

(4) The access network device sends a message 4: contention resolution message to the terminal.

The contention resolution message sent by the access network device to the terminal on the Down Link Share Channel (DL_SCH).

Figure 2 shows a two-step flow chart of the non-contention-based random access process. In this random access process, only the first and second steps in the contention-based random access process are included. Yes, which includes:

The access network equipment uses the Physical Downlink Control Channel (PDCCH) to schedule message 2 and is addressed through C-RNTI or RA-RNTI. RA-RNTI is determined by the Physical Random Access Channel (Physical Random Access Channel) carrying message 1. Access Channel (PRACH) time-frequency resource location is determined. Message 2 contains the uplink transmission timing advance and allocates uplink resources and temporary C-RNTI for message 3.

In this scheme, the focus is on the situation of the random access process based on competition. In the contention-based random access process, the 4-step random access process can be combined into a 2-step random access process. With reference to Figure 3, the combined message includes message A and message B. The relevant steps include:

(1) The terminal sends a message A to the access network device.

(2) After receiving the message A sent by the terminal, the access network device sends the message B to the terminal.

Optionally, message A includes the content of message 1 and message 3, that is, message A includes: random access preamble sequence and UE ID. The UE ID can be one of C-RNTI, temporary C-RNTI, and RA-RNTI. Species

Optionally, message B includes the contents of message 2 and message 4, that is, message B includes: random access response and contention resolution information.

In the related technology, when the UE ID carried in the message A is C-RNTI, the access network device uses the HARQ mechanism to send the message B to the UE. When the UE ID carried in message A is not C-RNTI (such as S-TMSI or the first random number), the access network device multiplexes the RARs issued to multiple UEs into one MAC PDU and sends it, that is, message B The message B of multiple UEs is multiplexed in one MAC PDU and sent, so HARQ cannot be used for feedback. To this end, the present disclosure provides the following embodiments.

The communication systems and business scenarios described in the embodiments of the present disclosure are intended to more clearly illustrate the technical solutions of the embodiments of the present disclosure, and do not constitute a limitation to the technical solutions provided by the embodiments of the present disclosure. Those of ordinary skill in the art will know that with the communication system The evolution of and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present disclosure are equally applicable to similar technical problems.

FIG. 4 shows a block diagram of a communication system provided by an exemplary embodiment of the present disclosure. The communication system may include: an access network 12 and a terminal 13.

The access network 12 includes several access network devices 120. The access network device 120 may be a base station, which is a device deployed in an access network to provide a wireless communication function for a terminal. The base station may include various forms of macro base stations, micro base stations, relay stations, access points, and so on. In systems using different wireless access technologies, the names of devices with base station functions may be different. For example, in LTE systems, they are called eNodeB or eNB; in 5G NR systems, they are called gNodeB or gNB. With the evolution of communication technology, the name "base station" may be described and will change. For convenience, in the embodiments of the present disclosure, the above-mentioned devices for providing wireless communication functions for terminals are collectively referred to as access network equipment.

The terminal 13 may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to wireless modems, as well as various forms of User Equipment (UE), mobile stations ( Mobile Station, MS), terminal (terminal device), etc. For ease of description, the devices mentioned above are collectively referred to as terminals. The access network device 120 and the terminal 13 communicate with each other through a certain air interface technology, such as a Uu interface.

Fig. 5 is a flow chart showing a method for sending messages in a random access process according to an exemplary embodiment. In this embodiment, the method is applied to the communication system shown in FIG. 4 as an example. The method can include the following steps:

Step 201: The terminal sends a message A to the access network device.

The terminal sends a message A to the access network device to try to establish uplink synchronization with the access network device.

Optionally, message A carries a random access preamble sequence and identification information. The identification information is at least one of C-RNTI, S-TMSI, first random number, and second random number.

Optionally, the random access preamble sequence is selected by the terminal from multiple candidate random access preamble sequences. The random access preamble sequence has a corresponding sequence identifier (preamble ID).

Step 202: After receiving message A, the access network device determines whether message B needs RA-RNTI scheduling. When message B needs to use RA-RNTI scheduling, the access network device generates RA-RNTI addressing scheduling information.

The access network device receives the message A sent by the terminal through the uplink channel.

After receiving message A, the access network equipment determines whether message B needs to use RA-RNTI-addressed scheduling information according to the content of message A. Among them, "addressing" can also be called "scrambling".

The scheduling information is used to schedule the time-frequency resource location used by message B during transmission, so that the terminal can successfully receive message B.

Optionally, identification information is added to the scheduling information, and the identification information is used to indicate the receiving terminal corresponding to the message B, so that the terminal knows that the message B is sent separately and does not use a multiplexed sending mode.

Optionally, the identification information is first identification information used to identify the terminal, and/or the identification information is second identification information used to identify message A.

Step 203: The access network device sends scheduling information.

After determining that message B needs to be scheduled using RA-RNTI, the access network device generates scheduling information scrambled with RA-RNTI, and sends the generated scheduling information to the terminal.

Optionally, RA-RNTI is determined by the random access preamble sequence carried in message A.

Step 204: The terminal receives the scheduling information sent by the access network equipment using RA-RNTI addressing.

The terminal uses RA-RNTI to address (also called descrambling) scheduling information. The terminal determines the location of the time-frequency resource for transmitting message B according to the scheduling information obtained by descrambling.

When the scheduling information obtained by descrambling carries identification information, the terminal determines whether the message B is separately sent to the terminal according to the identification information in the scheduling information.

Optionally, when the first identification information is carried in the scheduling information, the terminal determines whether the first identification information is the same as its own UE ID; if they are the same, confirm that the message B is sent to the terminal separately; if not, It is confirmed that the message B is not sent to the terminal alone.

Optionally, when the second identification information is carried in the scheduling information, the terminal determines that the second identification information corresponds to the information in the message A; if it corresponds, it confirms that the message B is sent to the terminal separately; if it does not correspond, It is confirmed that the message B is not sent to the terminal alone.

Step 205: The access network device uses the HARQ mechanism to send message B to the terminal separately.

Optionally, the message B includes random access response and contention resolution information.

Optionally, the access network device sending the message B separately to the terminal includes using RA-RNTI to scramble the message B.

Optionally, the access network device uses the HARQ mechanism to send message B.

Step 206: The terminal receives the message B sent by the access network device according to the scheduling information.

The terminal receives the message B at the designated time-frequency resource location according to the indication of the scheduling information.

Step 207: When determining that the message B is a message sent to the terminal separately, the terminal sends the HARQ feedback of the message B to the access network device.

When receiving message B successfully, the terminal generates feedback information for successful reception, such as confirming feedback ACK; when receiving message B not successfully, generating feedback information for failed reception, such as denying feedback NACK.

Optionally, the HARQ feedback includes: ACK and NACK. When the terminal successfully receives message B, the terminal sends an ACK feedback to the access network device; when the terminal does not successfully receive message B, the terminal sends a NACK feedback to the access network device.

Step 208: The access network device receives HARQ feedback.

When the access network device receives the ACK, it means that the terminal successfully receives the message B and completes the random access process. When the access network device receives the NACK, it means that the terminal has not successfully received the message B and retransmits the message B.

In summary, in the method provided in this embodiment, in the 2-step random access process, when the access network device determines that it needs to use RA-RNTI to schedule message B, it sends message B separately to the terminal, so HARQ can be used. The mechanism receives the terminal's reception feedback on message B, and avoids multiplexing the RAR of multiple terminals into the same MAC PDU for transmission in the RA-RNTI scheduling scenario, thereby solving the problem that the message B scheduled by RA-RNTI cannot be used in related technologies The problem of HARQ mechanism.

The identification information carried in the scheduling information is used to indicate to the terminal that the message B is sent separately, and there are at least two types of implementation of the identification information:

1. The identification information is the first identification information used to identify the terminal. You can refer to the embodiment shown in Figure 6 below;

2. The identification information is the second identification information used to identify the message A. Refer to the embodiment shown in FIG. 7 below.

Fig. 6 shows a flowchart of a method for sending a message in a random access process according to another exemplary embodiment. In this embodiment, the method is applied to the communication system shown in FIG. 4 as an example. The method specifically includes the following steps.

Step 301: The terminal sends a message A to the access network device.

Optionally, the random access preamble sequence is selected by the terminal from multiple candidate random access preamble sequences. The random access preamble sequence has a corresponding preamble ID.

Step 302: After receiving the message A, the access network device determines whether the message B needs RA-RNTI scheduling. When the message B needs to use the RA-RNTI scheduling, the access network device generates scheduling information carrying the first identification information.

When message A carries C-RNTI, the access network equipment determines that message B needs to be scheduled by C-RNTI; when message A does not carry C-RNTI, the access network equipment determines that message B needs to use RA -RNTI scheduling, generating scheduling information carrying the first identification information. The scheduling information is used to schedule the time-frequency resource location of the message B during transmission, and the first identification information is used to indicate to the terminal that the message B is sent separately.

In an optional embodiment, when the C-RNTI is not carried in the message A, the access network equipment also determines whether the first CCCH SDU is carried in the message A; when the message A carries the first CCCH SDU, Generate scheduling information carrying the first identification information, and subsequently send message B to the terminal separately. When the first CCCH SDU is not carried in the message A, scheduling information without the first identification information is generated, and the RARs of multiple terminals are subsequently multiplexed on one MAC PDU for transmission.

Among them, when message A carries the first CCCH SDU, it means that the UE wants to initiate connection establishment/connection recovery/connection re-establishment. Since the data volume of the second CCCH SDU that needs to be replied in message B is large, message B does not Suitable for multiplexing transmission.

In an optional embodiment, when message A does not carry C-RNTI, the access network device also determines whether message B needs to fall back to message 2 in the four-step random access process; when message B does not need When returning to message 2 in the four-step random access process, scheduling information carrying the first identification information is generated, and subsequently message B is separately sent to the terminal. When message B needs to fall back to message 2 in the four-step random access process, the scheduling information that does not carry the first identification information is generated, and subsequent transmission is performed according to the four-step random access process.

In an optional embodiment, the method for the access network device to determine whether message B needs to fall back to message 2 in the four-step random access process may include, when the random access preamble sequence carried in message A is successfully received, And when the identification information carried in message A is successfully received, it is determined that message B does not need to fall back to message 2 in the four-step random access process; when the random access preamble sequence carried in message A is successfully received, and message A carries When the identification information is not successfully received, it is determined that message B needs to fall back to message 2 in the four-step random access process.

Optionally, generating the scheduling information carrying the first identification information by the access network device includes at least one of the following manners:

When S-TMSI is carried in message A, S-TMSI is determined to be the first identification information and added to the scheduling information, or S-TMSI is truncated (front segment truncation or back segment truncation or middle truncation) After processing, determine the truncated S-TMSI as the first identification information, and the truncated S-TMSI is the preset number of bits;

When the first random number is carried in the message A, the first random number is determined as the first identification information and added to the scheduling information, or the first random number is truncated (the first segment is truncated or the second segment is truncated or the middle After truncation) processing, the truncated first random number is determined as the first identification information, and the truncated first random number is the preset number of bits.

Optionally, the first random number is 30-40 bits, and the truncated first random number is less than 25 bits.

The access network device adds the scheduling information with the first identification information, and uses RA-RNTI for scrambling.

Step 303: The access network device sends scheduling information.

The access network device sends the generated scheduling information to the terminal. Among them, the scheduling information is used to schedule the time-frequency resource location of message B so that the terminal can successfully receive message B.

Step 304: The terminal obtains first identification information from the scheduling information. When the first identification information is the same as the UE ID of the terminal, or when the first identification information is the same as the truncated UE ID, the terminal determines that the message B is a separate Message sent to the terminal.

The terminal uses RA-RNTI to address (or descramble) the scheduling information, and after successfully receiving the scheduling information sent by the access network device, the first identification information is obtained from the scheduling information.

When the first identification information is the same as its own UE ID, it is determined that the message B is sent separately. Or, when the first identification information is the same as the ID of the UE after its own truncation, it is determined that the message B is sent separately.

When the scheduling information does not carry the first identification information, it is determined that the message B is not sent separately; or, when the scheduling information carries the first identification information and the first identification information is different from its own UE ID, it is determined that the message B is not alone. Sent; or, when the scheduling information carries the first identification information and the first identification information is different from the UE ID after its own truncation, it is determined that the message B is not sent separately.

Step 305: The access network device uses the HARQ mechanism to send message B to the terminal separately.

Step 306: The terminal receives the message B sent by the access network device according to the scheduling information.

Optionally, the terminal uses RA-RNTI addressing to receive message B at the time-frequency resource location specified in the scheduling information.

Step 307: When it is determined that the message B is a message separately sent to the terminal, the HARQ feedback of the message B is sent to the access network device.

Step 308: The access network device receives HARQ feedback.

In summary, the method provided in this embodiment uses the UE ID as the first identification information, which facilitates the terminal to quickly confirm whether the message B is sent separately, and simplifies the calculation complexity of the terminal.

Since the number of bits that can be carried by the scheduling information is limited, the method provided in this embodiment can also use the truncated UE ID as the first identification information, which is convenient for scheduling information to complete the first identification information with a small number of bits. transmission.

The method provided in this embodiment can also generate scheduling information that carries the first identification information when the message A does not carry the C-RNTI and the message A carries the first CCCH SDU. This is because when message A carries the first CCCH SDU, message B usually contains the second CCCH SDU. The size of the second CCCH SDU is relatively large, so the combined message B may also be relatively large, which is not suitable for multiplexing. The transmission mode of the same MAC PDU is more suitable for separate transmission mode.

The method provided in this embodiment can also generate scheduling information carrying the first identification information when message A does not carry C-RNTI and message B is not a fallback to message 2 in the four-step random access process . This is because when message B falls back to message 2, it needs to use a four-step random access process for transmission.

Fig. 7 shows a flowchart of a message sending method of a random access process shown in another exemplary embodiment. In this embodiment, the method is applied to the communication system shown in FIG. 4 as an example. The method specifically includes the following steps.

Step 401: The terminal sends a message A to the access network device.

Optionally, the second random number is the random number proposed in this embodiment, and the number of bits of the second random number is smaller than the number of bits of the first random number. Optionally, the number of bits of the second random number is less than 25 bits.

Optionally, the terminal uses a random number generation algorithm to generate the second random number, or, after the terminal truncates the first random number (front truncation or rear truncation or intermediate truncation), the truncated first random number A random number is used as the second random number.

Optionally, the terminal generates a first random number and adds it to message A; or, the terminal generates a second random number and adds it to message A; or, the terminal generates a first random number and truncates the first random number to form a second random number Or, the terminal generates the first random number and the second random number, and adds the first random number and the second random number to the message A.

Step 402: After receiving message A, the access network device determines whether message B needs RA-RNTI scheduling. When message B needs to use RA-RNTI scheduling, the access network device generates scheduling information that carries second identification information.

When message A carries C-RNTI, the access network equipment determines that message B needs to be scheduled by C-RNTI; when message A does not carry C-RNTI, the access network equipment determines that message B needs to use RA -RNTI scheduling, generating scheduling information carrying the second identification information. The scheduling information is used to schedule the time-frequency resource location of the message B during transmission, and the second identification information is used to indicate to the terminal that the message B is sent separately.

In an optional embodiment, when the C-RNTI is not carried in the message A, the access network equipment also determines whether the first CCCH SDU is carried in the message A; when the message A carries the first CCCH SDU, The scheduling information carrying the second identification information is generated, and then message B is sent to the terminal separately. When the first CCCH SDU is not carried in the message A, scheduling information without the second identification information is generated, and the RARs of multiple terminals are subsequently multiplexed on one MAC PDU for transmission.

In an optional embodiment, when message A does not carry C-RNTI, the access network device also determines whether message B needs to fall back to message 2 in the four-step random access process; when message B does not need When returning to message 2 in the four-step random access process, scheduling information carrying the second identification information is generated, and subsequently message B is sent to the terminal separately. When the message B needs to fall back to the message 2 in the four-step random access process, the scheduling information without the second identification information is generated, and the subsequent transmission is performed according to the four-step random access process.

Optionally, generating the scheduling information carrying the second identification information by the access network device includes at least one of the following methods:

When the random access preamble sequence is carried in the message A, the Preamble ID corresponding to the random access preamble sequence is determined as the second identification information, and the Preamble ID is added to the scheduling information.

When the second random number is carried in the message A, the second random number is determined to be added to the scheduling information.

When the first random number is carried in the message A, the first random number is truncated (the first segment is truncated or the second segment is truncated or the middle is truncated), and the truncated first random number is determined as the second The random number (that is, the second identification information), the second random number is a preset number of bits, for example, less than 25 bits.

The access network device adds the scheduling information with the second identification information, and uses RA-RNTI for scrambling.

Step 403: The access network device sends scheduling information.

Step 404: The terminal obtains the second identification information from the scheduling information, and when the second identification information corresponds to the information in the message A, it is determined that the message B is a message sent to the terminal separately.

The terminal uses RA-RNTI to address (or descramble) the scheduling information, and after successfully receiving the scheduling information sent by the access network device, the second identification information is obtained from the scheduling information.

When the second identification information corresponds to the random access preamble sequence in message A, it is determined that message B was sent separately. Or, when the second identification information is the same as the second random number in the message A, it is determined that the message B is sent separately. Or, when the second identification information is the same as the truncated first random number, it is determined that the message B is sent separately, and the first random number is carried in the message A.

When the scheduling information does not carry the second identification information, it is determined that the message B is not sent separately; or, when the scheduling information carries the second identification information and the second identification information does not correspond to the information of the message A, it is determined that the message B is not alone. Sent.

Step 405: The access network device uses the HARQ mechanism to send message B separately to the terminal.

Step 406: The terminal receives the message B sent by the access network device according to the scheduling information.

Step 407: When it is determined that the message B is a message sent separately to the terminal, the HARQ feedback of the message B is sent to the access network device.

Step 408: The access network device receives HARQ feedback.

In summary, the method provided in this embodiment uses the random access preamble sequence or the first random number or the second random number in message A to determine the second identification information, so that the terminal can quickly confirm whether message B was sent separately , Simplifies the computational complexity of the terminal.

Since the number of bits that the scheduling information can carry is limited, the method provided in this embodiment can also use the truncated first random number as the second random number as the second identification information, which is convenient for scheduling information to use a small number of bits. The transmission of the second identification information can be completed.

Since the number of bits that can be carried by the scheduling information is limited, the method provided in this embodiment can also use the second random number generated by the random number generation algorithm as the second identification information, so that the scheduling information can be completed with a small number of bits. 2. Transmission of identification information.

The method provided in this embodiment can also generate scheduling information that carries the second identification information when the message A does not carry the C-RNTI and the message A carries the first CCCH SDU. This is because when message A carries the first CCCH SDU, message B usually contains the second CCCH SDU. The size of the second CCCH SDU is relatively large, so the combined message B may also be relatively large, which is not suitable for multiplexing. The transmission mode of the same MAC PDU is more suitable for separate transmission mode.

The method provided in this embodiment can also generate scheduling information carrying the second identification information when message A does not carry C-RNTI and message B is not a fallback to message 2 in the four-step random access process . This is because when message B falls back to message 2, it needs to use a four-step random access process for transmission.

Fig. 8 is a block diagram showing a message sending device of a random access process according to an exemplary embodiment. The device has the function of realizing the terminal in the above method embodiment, and the function can be realized by hardware, or by hardware executing corresponding software. The apparatus 700 may include: a sending module 710, a receiving module 720, and a processing module 730.

The sending module 710 is configured to send the message A to the access network device;

The receiving module 720 is configured to receive scheduling information addressed and sent by the access network device using the random access wireless network temporary identifier RA-RNTI, where the scheduling information is used to schedule the time-frequency resource location of the message B;

The receiving module 710 is configured to receive the message B sent by the access network device according to the scheduling information;

The sending module 720 is configured to send a hybrid automatic repeat request HARQ feedback of the message B to the access network device when it is determined that the message B is a message separately sent to the terminal.

Optionally, the device further includes

The processing module 730 is configured to obtain the first identification information from the scheduling information;

The processing module 730 is configured to, when the first identification information is the same as the UE ID of the terminal, or when the terminal is the same as the UE ID after truncation, It is determined that the message B is a message separately sent to the terminal.

Optionally, the first identification information includes:

Temporary mobile user identification S-TMSI;

Or, the cell radio network temporary identifier C-RNTI;

Or, the first random number;

Or, the truncated S-TMSI;

Or, the truncated first random number;

Optionally, the processing module 730 is configured to obtain second identification information from the scheduling information;

The processing module 730 is configured to determine that the message B is a message sent to the terminal separately when the second identification information corresponds to the information in the message A.

Optionally, the second identification information includes:

The preamble ID corresponding to the random access preamble sequence carried in the message A;

Or, the second random number.

Optionally, the device further includes:

The processing module 730 is configured to generate a first random number and add it to the message A;

Or, the processing module 730 is configured to generate a second random number and add it to the message A;

Or, the processing module 730 is configured to generate the first random number, truncate the first random number to form the second random number and add it to the message A;

Or, the processing module 730 is configured to generate the first random number and the second random number, and add the first random number and the second random number to the message A;

On the other hand, a message sending device in a random access process is provided, which is used in a two-step random access process using message A and message B. Continue to refer to FIG. 8, the device includes:

The receiving module 720 is configured to receive the message A sent by the terminal;

The processing module 730 is configured to, when the message B needs to be scheduled using RA-RNTI, the processing module generates scheduling information addressed by the RA-RNTI, and the scheduling information is used to schedule the message B. Frequency resource location;

The sending module 710 is configured to separately send the message B to the terminal using the HARQ mechanism.

Optionally, the processing module 730 is configured to generate scheduling information that carries first identification information, where the first identification information is the UE ID of the terminal, or the first identification information is truncated The UE ID of;

The processing module 730 is configured to use the RA-RNTI to scramble the scheduling information.

Optionally, the first identification information includes:

S-TMSI;

Or, C-RNTI;

Or, the first random number;

Or, the truncated S-TMSI;

Or, the truncated first random number;

Optionally, the processing module 730 is configured to generate scheduling information that carries second identification information, where the second identification information corresponds to the information in the message A;

The processing module 730 uses the RA-RNTI to scramble the scheduling information.

Optionally, the second identification information includes:

Or, the second random number.

Optionally, the processing module 730 is configured to obtain the second random number from the message A;

Or, the processing module 730 is configured to obtain a first random number from the message A, and shorten the first random number to the second random number.

Optionally, the processing module 730 is configured to determine that the message B needs to use the RA-RNTI scheduling when the message A carries the first common control channel service data unit CCCH SDU.

Optionally, the processing module 730 is configured to determine that message B needs to be used when the C-RNTI of the terminal is not carried in message A and message B does not need to fall back to message 2 in the four-step random access process The RA-RNTI scheduling.

FIG. 9 shows a schematic structural diagram of a terminal provided by an exemplary embodiment of the present disclosure. The terminal includes: a processor 101, a receiver 102, a transmitter 103, a memory 104, and a bus 105.

The processor 101 includes one or more processing cores, and the processor 101 executes various functional applications and information processing by running software programs and modules.

The receiver 102 and the transmitter 103 may be implemented as a communication component, and the communication component may be a communication chip.

The memory 104 is connected to the processor 101 through a bus 105.

The memory 104 may be used to store at least one instruction, and the processor 101 is used to execute the at least one instruction to implement each step in the foregoing method embodiment.

In addition, the memory 104 can be implemented by any type of volatile or non-volatile storage device or a combination thereof. The volatile or non-volatile storage device includes, but is not limited to: magnetic disks or optical disks, electrically erasable and programmable Read-only memory (EEPROM), erasable programmable read-only memory (EPROM), static anytime access memory (SRAM), read-only memory (ROM), magnetic memory, flash memory, programmable read-only memory (PROM) .

In an exemplary embodiment, there is also provided a non-transitory computer-readable storage medium including instructions, such as a memory including instructions, which may be executed by a processor of a terminal to complete the foregoing method. For example, the non-transitory computer-readable storage medium may be ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.

A non-transitory computer-readable storage medium, when the instructions in the non-transitory computer storage medium are executed by the processor of the terminal, the terminal can execute the message sending method of the random access process.

Fig. 10 is a block diagram showing an access network device 1000 according to an exemplary embodiment.

The access network device 1000 may include: a processor 1001, a receiver 1002, a transmitter 1003, and a memory 1004. The receiver 1002, the transmitter 1003 and the memory 1004 are respectively connected to the processor 1001 through a bus.

The processor 1001 includes one or more processing cores, and the processor 1001 executes the method executed in the transmission configuration method provided by the embodiment of the present disclosure by running software programs and modules. The memory 1004 can be used to store software programs and modules. Specifically, the memory 1004 may store an operating system 10041 and an application program module 10042 required by at least one function. The receiver 1002 is used to receive communication data sent by other devices, and the transmitter 1003 is used to send communication data to other devices.

An exemplary embodiment of the present disclosure also provides a computer-readable storage medium in which at least one instruction, at least one program, code set or instruction set is stored, the at least one instruction, the At least one section of the program, the code set or the instruction set is loaded and executed by the processor to implement the steps performed by the terminal or the access network device in the message sending method in the random access process provided by the foregoing method embodiments.

Those skilled in the art will easily think of other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptive changes of the present disclosure. These variations, uses, or adaptive changes follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field that are not disclosed in the present disclosure. . The description and the embodiments are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are pointed out by the following claims.

It should be understood that the present disclosure is not limited to the precise structure that has been described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

A message sending method in a random access process, characterized in that the method includes:

The terminal sends a message A to the access network device;

The terminal receives the scheduling information addressed and sent by the access network device using the random access wireless network temporary identifier RA-RNTI, where the scheduling information is used to schedule the time-frequency resource location of the message B;

The terminal receives the message B sent by the access network device according to the scheduling information;

When determining that the message B is a message sent to the terminal separately, the terminal sends a hybrid automatic repeat request HARQ feedback of the message B to the access network device.
The method according to claim 1, wherein when the terminal determines that the message B is a message sent to the terminal separately, sending the HARQ feedback of the message B to the access network device includes: :

The terminal obtains first identification information from the scheduling information;

The terminal determines that the message B is the same when the first identification information is the same as the UE ID of the terminal, or when the first identification information is the same as the truncated UE ID A message sent separately to the terminal.
The method according to claim 2, wherein the first identification information comprises:

Temporary mobile user identification S-TMSI;

or,

Cell radio network temporary identification C-RNTI;

or,

First random number

or,

The truncated S-TMSI;

or,

The truncated first random number;

Wherein, the S-TMSI and the first random number are the initial UE ID of the terminal.
The method according to claim 1, wherein when the terminal determines that the message B is a message sent to the terminal separately, sending the HARQ feedback of the message B to the access network device includes: :

The terminal obtains second identification information from the scheduling information;

When the second identification information corresponds to the information in the message A, the terminal determines that the message B is a message separately sent to the terminal.
The method according to claim 4, wherein the second identification information comprises:

The sequence identifier preamble ID corresponding to the random access preamble sequence carried in the message A;

or,

The second random number.
The method of claim 5, wherein the method further comprises:

The terminal generates a first random number and adds it to the message A;

or,

The terminal generates a second random number and adds it to the message A;

or,

Generating the first random number by the terminal, truncating the first random number to form the second random number and adding it to the message A;

or,

Generating, by the terminal, the first random number and the second random number, and adding the first random number and the second random number to the message A;

Wherein, the number of bits of the first random number is greater than the number of bits of the second random number.
A message sending method in a random access process, characterized in that the method includes:

The access network device receives the message A sent by the terminal;

When message B needs to be scheduled using RA-RNTI, the access network device generates scheduling information addressed by the RA-RNTI, and the scheduling information is used to schedule the time-frequency resource location of the message B;

The access network device separately sends the message B to the terminal using the HARQ mechanism.
The method for sending a message according to claim 7, wherein the generation of the scheduling information addressed by the RA-RNTI by the access network device comprises:

The access network device generates scheduling information that carries first identification information, where the first identification information is the UE ID of the terminal, or the first identification information is the UE ID after truncation;

The access network device uses the RA-RNTI to scramble the scheduling information.
The message sending method according to claim 8, wherein the first identification information comprises:

Temporary mobile user identification S-TMSI;

or,

Cell radio network temporary identification C-RNTI;

or,

First random number

or,

The truncated S-TMSI;

or,

The truncated first random number;

Wherein, the S-TMSI and the first random number are the initial UE ID of the terminal.
The method for sending a message according to claim 7, wherein the generation of the scheduling information addressed by the RA-RNTI by the access network device comprises:

The access network device generates scheduling information that carries second identification information, where the second identification information corresponds to the information in the message A;

The access network device uses the RA-RNTI to scramble the scheduling information.
The method for sending a message according to claim 10, wherein the second identification information comprises:

The sequence identifier preamble ID corresponding to the random access preamble sequence carried in the message A;

Or, the second random number.
The method for sending messages according to claim 11, wherein the method further comprises:

Obtaining the second random number from the message A;

or,

A first random number is obtained from the message A, and the first random number is truncated to the second random number.
The method for sending messages according to any one of claims 7 to 12, wherein the method further comprises:

When the message A carries the first common control channel service data unit CCCH SDU, it is determined that the message B needs to be scheduled by the RA-RNTI.
The message sending method according to any one of claims 7 to 12, wherein the method further comprises: when the C-RNTI of the terminal is not carried in the message A, and the message B does not need to fall back to four random steps When message 2 in the access process, it is determined that message B needs to be scheduled by the RA-RNTI.
A message sending device in a random access process, characterized in that the device includes:

The sending module is configured to send message A to the access network device;

The receiving module is configured to receive the scheduling information addressed and sent by the access network device using the random access wireless network temporary identifier RA-RNTI, where the scheduling information is used to schedule the time-frequency resource location of the message B;

The receiving module is configured to receive the message B sent by the access network device according to the scheduling information;

The sending module is configured to send a hybrid automatic repeat request HARQ feedback of the message B to the access network device when it is determined that the message B is separately sent to the terminal.
The device according to claim 15, wherein the device further comprises

A processing module configured to obtain first identification information from the scheduling information;

The processing module is configured to determine when the first identification information is the same as the UE ID of the terminal, or when the terminal is the same as the UE ID after truncation The message B is a message sent to the terminal separately.
The device according to claim 15, wherein the first identification information comprises:

Temporary mobile user identification S-TMSI;

or,

Cell radio network temporary identification C-RNTI;

or,

First random number

or,

The truncated S-TMSI;

or,

The truncated first random number;

Wherein, the S-TMSI and the first random number are the initial UE ID of the terminal.
The device according to claim 15, wherein:

The processing module is configured to obtain second identification information from the scheduling information;

The processing module is configured to determine that the message B is a message separately sent to the terminal when the second identification information corresponds to the information in the message A.
The device according to claim 18, wherein the second identification information comprises:

The sequence identifier preamble ID corresponding to the random access preamble sequence carried in the message A;

or,

The second random number.
The device according to claim 19, wherein:

The processing module is configured to generate a first random number and add it to the message A;

or,

The processing module is configured to generate a second random number and add it to the message A;

or,

The processing module is configured to generate the first random number, truncate the first random number to form the second random number and add it to the message A;

or,

The processing module is configured to generate the first random number and the second random number, and add the first random number and the second random number to the message A;

Wherein, the number of bits of the first random number is greater than the number of bits of the second random number.
A message sending device in a random access process, characterized in that the device includes:

The receiving module is configured to receive message A sent by the terminal;

The processing module is configured to generate scheduling information addressed by the RA-RNTI when the message B needs to be scheduled using RA-RNTI, and the scheduling information is used to schedule the time-frequency resource location of the message B ；

The sending module is configured to separately send the message B to the terminal using the HARQ mechanism.
The message sending device according to claim 21, wherein:

The processing module is configured to generate scheduling information that carries first identification information, where the first identification information is the UE ID of the terminal, or the first identification information is the UE ID after truncation ；

The processing module is configured to use the RA-RNTI to scramble the scheduling information.
The message sending device according to claim 22, wherein the first identification information comprises:

Temporary mobile user identification S-TMSI;

or,

Cell radio network temporary identification C-RNTI;

or,

First random number

or,

The truncated S-TMSI;

or,

The truncated first random number;

Wherein, the S-TMSI and the first random number are the initial UE ID of the terminal.
The message sending device according to claim 21, wherein:

The processing module is configured to generate scheduling information carrying second identification information, where the second identification information corresponds to the information in the message A;

The processing module uses the RA-RNTI to scramble the scheduling information.
The message sending device according to claim 24, wherein the second identification information comprises:

The sequence identifier preamble ID corresponding to the random access preamble sequence carried in the message A;

or,

The second random number.
The message sending device according to claim 25, wherein:

The processing module is configured to obtain the second random number from the message A;

or,

The processing module is configured to obtain a first random number from the message A, and shorten the first random number to the second random number.
The message sending device according to any one of claims 21 to 26, wherein:

The processing module is configured to determine that the message B needs to use the RA-RNTI scheduling when the message A carries the first common control channel service data unit CCCH SDU.
The message sending device according to any one of claims 21 to 26, wherein:

The processing module is configured to determine that message B needs to use the RA-RNTI when message A does not carry the C-RNTI of the terminal, and message B does not need to fall back to message 2 in the four-step random access process Scheduling.
A terminal, characterized in that the terminal includes:

processor;

A transceiver connected to the processor;

A memory for storing processor executable instructions;

Wherein, the processor is configured to load and execute the executable instruction to implement the message sending method in the random access process according to any one of claims 1 to 6.
An access network device, characterized in that the access network device includes:

processor;

A transceiver connected to the processor;

A memory for storing processor executable instructions;

The processor is configured to load and execute the executable instructions to implement the method for sending messages in a random access process according to any one of claims 7 to 14.
A computer-readable storage medium, wherein the computer-readable storage medium stores at least one instruction, at least one program, code set or instruction set, the at least one instruction, the at least one program, the The code set or instruction set is loaded and executed by the processor to realize the message sending method in the random access process according to any one of claims 1 to 6, or the random access according to any one of claims 7 to 14 The message sending method in the incoming process.