CN109983829B

CN109983829B - Message sending method, device, equipment and system in random access process

Info

Publication number: CN109983829B
Application number: CN201980000187.6A
Authority: CN
Inventors: 江小威
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2019-02-22
Filing date: 2019-02-22
Publication date: 2022-08-05
Anticipated expiration: 2039-02-22
Also published as: WO2020168566A1; CN109983829A

Abstract

The disclosure relates to a message sending method, a message sending device, message sending equipment and a message sending storage medium in a random access process, and belongs to the field of communication. The method comprises the following steps: the terminal sends a message A to the access network equipment; the terminal receives scheduling information sent by the access network equipment by adopting RA-RNTI addressing, wherein the scheduling information is used for scheduling the time-frequency resource position of the message B; the terminal receives a message B sent by the access network equipment according to the scheduling information; and the terminal sends the HARQ feedback of the message B to the access network equipment when determining that the message B is the message which is sent to the terminal independently. The method and the device can solve the problem that a HARQ mechanism cannot be used when a plurality of RARs are multiplexed to one MAC PDU for transmission.

Description

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

Technical Field

The present disclosure relates to the field of communications, and in particular, to a message sending method, apparatus, device, and system in a random access procedure.

Background

The random access procedure is as follows: the process is from the terminal sending the random access preamble to trying to access the network side to the process before the basic signaling connection is established between the terminal and the network side.

In Long Term Evolution (LTE) and New Radio interface (NR) protocols of a Third Generation Partnership Project (3 GPP), a Random Access Response (RAR) packet during a Random Access process is relatively small, and a base station multiplexes RARs issued to a plurality of terminals (UEs) into a Medium Access Control Protocol Data Unit (MAC PDU) for transmission, so as to reduce downlink overhead.

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

Disclosure of Invention

The embodiment of the disclosure provides a message sending method, device, equipment and system in a random access process, which can solve the problem that a base station multiplexes RARs issued to multiple terminals into one MAC PDU to send, so that the RARs cannot use an HARQ mechanism. The technical scheme is as follows:

in one aspect, a method for sending a message in a random access process is provided, where the method includes:

the terminal sends a message A to the access network equipment;

the terminal receives scheduling information sent by the Access Network equipment by adopting Random Access Radio Network Temporary Identifier (RA-RNTI) addressing, wherein the scheduling information is used for scheduling the time-frequency resource position of a message B;

the terminal receives a message B sent by the access network equipment according to the scheduling information;

and when determining that the message B is a message which is independently sent to the terminal, the terminal sends Hybrid Automatic Repeat request (HARQ) feedback of the message B to the access network equipment.

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

the terminal acquires first identification information from the scheduling information;

the terminal determines that the message B is a message separately sent to the terminal when the first identification information is identical to a User Equipment (UE) ID of the terminal or when the first identification information is identical to the truncated UE ID.

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

a Temporary Mobile Subscriber Identity (S-TMSI);

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

or, a first random number;

or, the S-TMSI after truncation;

or, the truncated first random number;

wherein the S-TMSI and the first random number are an initial UE ID of the terminal.

the terminal acquires second identification information from the scheduling information;

and when the second identification information corresponds to the information in the message A, the terminal determines that the message B is a message which is independently sent to the terminal.

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

the sequence identifier preamble ID corresponding to the random access leader sequence carried by the message A; or, a second random number.

In an optional implementation, the method further includes:

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

or, the terminal generates a second random number and adds the second random number 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 the second random number 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 procedure is provided, where the method includes:

the access network equipment receives a message A sent by a terminal;

when a message B needs to be scheduled by using an RA-RNTI, the access network equipment generates scheduling information addressed by the RA-RNTI, and the scheduling information is used for scheduling the time-frequency resource position of the message B;

and the access network equipment adopts an HARQ mechanism to independently send the message B to the terminal.

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

the access network equipment generates scheduling information carrying first identification information, wherein the first identification information is a UE ID of the terminal, or the first identification information is the truncated UE ID;

and the access network equipment scrambles the scheduling information by adopting the RA-RNTI.

S-TMSI；

or, C-RNTI;

or, a first random number;

or, the S-TMSI after truncation;

or, the truncated first random number;

the access network equipment generates scheduling information carrying second identification information, wherein the second identification information corresponds to the information in the message A;

the sequence identifier preamble ID corresponding to the random access leader sequence carried by the message A;

or, a second random number.

In an optional implementation, the method further comprises:

acquiring the second random number from the message A;

or, acquiring a first random number from the message A, and truncating the first random number into the second random number.

In an optional implementation, the method further includes:

when the message a carries a Common Control Channel (CCCH) Service Data Unit (SDU), it is determined that the message B needs to be scheduled by using the RA-RNTI.

In an optional implementation, the method further includes: and when the message A does not carry the C-RNTI of the terminal and the message B does not need to return to the message 2 in the four-step random access process, determining that the message B needs to adopt the RA-RNTI scheduling.

In another aspect, a message sending apparatus in a random access procedure is provided, the apparatus including:

a sending module configured to send a message a to an access network device;

the receiving module is configured to receive scheduling information sent by the access network equipment by addressing through a random access radio network temporary identifier RA-RNTI, and the scheduling information is used for scheduling a time-frequency resource position of a message B;

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

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

In an alternative implementation, the apparatus further comprises

The processing module is configured to acquire first 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 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 temporary mobile subscriber identity, S-TMSI;

or, a cell radio network temporary identifier C-RNTI;

or, a first random number;

or, the S-TMSI after truncation;

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 transmitted to the terminal when the second identification information corresponds to information in the message a.

or, a second random number.

In an optional implementation manner, the processing module is configured to generate a first random number to be added to the message a;

or, the processing module is configured to generate a second random number to be added 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 the second random number 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 a message A sent by the terminal;

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

a transmitting module configured to transmit the message B to the terminal separately by using a HARQ mechanism.

In an optional implementation manner, the processing module is configured to generate scheduling information carrying first identification information, where the first identification information is a UE ID of the terminal, or the first identification information is a truncated UE ID;

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

S-TMSI；

or, C-RNTI;

or, a first random number;

or, the S-TMSI after truncation;

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 information in the message a;

and the processing module scrambles the scheduling information by adopting the RA-RNTI.

or, a 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 truncate the first random number into the second random number.

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

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

In another aspect, a terminal is provided, which includes:

a processor;

a transceiver coupled 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 procedure performed by an access network device as in the above aspect.

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

a processor;

a transceiver coupled to the processor;

a memory for storing processor-executable instructions;

In another aspect, a computer-readable storage medium is provided, in which at least one instruction, at least one program, a set of codes, or a set of instructions is stored, and the at least one instruction, the at least one program, the set of codes, or the set of instructions is loaded and executed by the processor to implement the message sending method in the random access procedure as described above.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

in the 2-step random access process, when the access network equipment determines that the message B needs to be scheduled by adopting the RA-RNTI, the access network equipment independently sends the message B to the terminal, so that the HARQ mechanism can be adopted to receive feedback of the terminal to the message B, RARs of a plurality of terminals are prevented from being multiplexed into the same MAC PDU for transmission in the RA-RNTI scheduling scene, and the problem that the message B scheduled by adopting the RA-RNTI in the related technology cannot use the HARQ mechanism is solved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a flow chart of 4 steps of a contention-based random access procedure;

fig. 2 is a flow chart of 2 steps of a non-contention based random access procedure;

fig. 3 is a flow chart of 2 steps of a contention-based random access procedure;

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

fig. 5 is a flow diagram illustrating a messaging method of a random access procedure in accordance with an example embodiment;

fig. 6 is a flow chart illustrating a messaging method of a random access procedure in accordance with another example embodiment;

fig. 7 is a flow chart illustrating a messaging method of a random access procedure in accordance with another example embodiment;

fig. 8 is a block diagram illustrating a message transmitting apparatus of a random access procedure in accordance with an example embodiment;

FIG. 9 is a block diagram of a terminal shown in accordance with an example embodiment;

fig. 10 is a block diagram illustrating an access network device in accordance with an example embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

The random access procedure refers to a procedure from a user sending a random access preamble sequence to a network to a time when a basic signaling connection is established between the user and the network, and is one of the most basic requirements for any cellular communication system, and is used for enabling the terminal to establish data communication with a network side.

The random access process is divided into: fig. 1 shows that in a contention based random access procedure, 4 steps of the random access procedure include:

(1) the terminal sends message 1 to the access network equipment: a random access preamble sequence (preamble).

The terminal sends a random access preamble sequence (preamble) to the access network equipment, and the access network equipment estimates the transmission delay of the terminal according to the preamble sequence to realize uplink synchronization.

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

The access network device sends a time advance (timing advance) command based on the transmission delay estimated in the first step to adjust the sending time of the terminal. The message 2 is organized by a Media Access Control (MAC) layer of the Access network device and is carried by a downlink shared Channel (DL _ SCH), and one message 2 can simultaneously respond to random Access requests of multiple terminals.

The Access network device uses a Physical Downlink Control Channel (PDCCH) scheduling message 2, and performs addressing (also called scrambling) through a C-RNTI or an RA-RNTI, which is determined by a time frequency resource location of a Physical Random Access Channel (PRACH) carrying the message 1. And the message 2 comprises an uplink transmission timing advance and allocates uplink resources and the temporary C-RNTI for the message 3.

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

After receiving the message 2, the terminal transmits a message 3 on the allocated uplink resource, and sends a User Equipment identity (UE ID) to the access network Equipment through an uplink shared Channel (Up Link Share Channel, UL _ SCH).

Optionally, the message 3 includes a Common Control Channel (CCCH) Service Data Unit (SDU) for the message 4 to carry the contention resolution ID.

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

The access network device transmits a contention resolution message to the terminal on a downlink shared Channel (DL _ SCH).

Fig. 2 shows a flow chart of 2 steps in a non-contention based random access procedure, which only includes a first step and a second step in the contention based random access procedure, that is, includes:

The Access network device adopts a Physical Downlink Control Channel (PDCCH) scheduling message 2, and addresses through a C-RNTI or an RA-RNTI, wherein the RA-RNTI is determined by a Physical Random Access Channel (PRACH) time frequency resource position of the bearing message 1. And the message 2 comprises an uplink transmission timing advance and allocates uplink resources and the temporary C-RNTI for the message 3.

In this scheme the case of contention based random access procedure is mainly studied. In the contention-based random access procedure, 4-step random access procedures may be combined into a 2-step random access procedure, and with reference to fig. 3, after combination, the message a and the message B are included, and the related steps include:

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

(2) And after receiving the message A sent by the terminal, the access network equipment sends a message B to the terminal.

Optionally, the message a includes the contents of message 1 and message 3, that is, the message a includes: a random access preamble sequence and a UE ID, which may be: one of C-RNTI, temporary C-RNTI and RA-RNTI;

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

In the related art, when the UE ID carried in the message a is the C-RNTI, the access network device sends the message B to the UE by using the HARQ mechanism. When the UE ID carried by the message a is not a C-RNTI (such as S-TMSI or a first random number), the access network device multiplexes RARs issued to multiple UEs in one MAC PDU to transmit, that is, the message B is transmitted by multiplexing the message B of multiple UEs in one MAC PDU, so HARQ cannot be applied for feedback. To this end, the present disclosure is provided with the following embodiments.

The communication system and the service scenario described in the embodiment of the present disclosure are for more clearly illustrating the technical solution of the embodiment of the present disclosure, and do not constitute a limitation to the technical solution provided in the embodiment of the present disclosure, and as a person having ordinary skill in the art knows that along with the evolution of the communication system and the appearance of a new service scenario, the technical solution provided in the embodiment of the present disclosure is also applicable to similar technical problems.

Fig. 4 is a block diagram illustrating a communication system provided by an exemplary embodiment of the present disclosure, which may include: an access network 12 and a terminal 13.

Several access network devices 120 are included in access network 12. The access network equipment 120 may be a base station, which is a device deployed in an access network to provide wireless communication functions for terminals. The base stations may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems using different radio access technologies, the names of devices with base station functionality may differ, for example in LTE systems, called eNodeB or eNB; in the 5G NR system, it is called a gbnodeb or a gNB. The name "base station" may describe, and may vary with the evolution of communication technology. For convenience, in the embodiments of the present disclosure, the above-mentioned device for providing a wireless communication function for a terminal is collectively referred to as an access network device.

The terminal 13 may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem with wireless communication functions, as well as various forms of User Equipment (UE), Mobile Station (MS), terminal (terminal device), and so on. For convenience of description, the above-mentioned devices are collectively referred to as a terminal. The access network device 120 and the terminal 13 communicate with each other through some air interface technology, for example, a Uu interface.

Fig. 5 is a flowchart illustrating a message sending method in a random access procedure according to an example embodiment. The present embodiment is illustrated with the method applied to the communication system as shown in fig. 4. The method may include the steps of:

step 201, the terminal sends message a to the access network device.

And the terminal sends a message A to the access network equipment to try to establish uplink synchronization with the access network equipment.

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

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

Step 202, after receiving the message A, the access network equipment determines whether the message B needs RA-RNTI scheduling, and when the message B needs RA-RNTI scheduling, the access network equipment generates scheduling information addressed by RA-RNTI.

And the access network equipment receives the message A sent by the terminal through the uplink channel.

After receiving the message A, the access network equipment determines whether the message B needs to adopt the scheduling information addressed by the RA-RNTI according to the content of the message A. Where "addressing" may also be referred to as "scrambling".

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

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

Optionally, the identification information is first identification information for identifying the terminal, and/or the identification information is second identification information for identifying the message a.

Step 203, the access network equipment sends scheduling information.

And after determining that the message B needs to be scheduled by using the RA-RNTI, the access network equipment generates scheduling information scrambled by adopting the RA-RNTI and sends the generated scheduling information to the terminal.

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

And step 204, the terminal receives scheduling information sent by the access network equipment by adopting RA-RNTI addressing.

The terminal addresses (also called descrambling) the scheduling information using the RA-RNTI. And the terminal determines the time-frequency resource position for transmitting the message B according to the scheduling information obtained by descrambling.

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

Optionally, when the scheduling information carries first identification information, the terminal determines whether the first identification information is the same as the UE ID of the terminal; if the message B is the same as the message B, the message B is confirmed to be independently sent to the terminal; if not, the message B is confirmed not to be sent to the terminal independently.

Optionally, when the scheduling information carries second identification information, the terminal determines that the second identification information corresponds to the information in the message a; if so, confirming that the message B is independently sent to the terminal; if not, the message B is confirmed not to be sent to the terminal independently.

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

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

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

Optionally, the access network device sends the message B by using an HARQ mechanism.

And step 206, the terminal receives the message B sent by the access network equipment according to the scheduling information.

And the terminal receives the message B at the appointed time-frequency resource position according to the indication of the scheduling information.

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

When the terminal receives the message B successfully, the terminal generates feedback information for successful reception, such as acknowledgement feedback ACK; if the message B is not successfully received, feedback information for failed reception, such as a Negative Acknowledgement (NACK) feedback, is generated.

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

In step 208, the access network device receives the HARQ feedback.

And when the access network equipment receives the ACK, the access network equipment indicates that the terminal successfully receives the message B, and the random access process is completed. And when the access network equipment receives the NACK, the terminal does not successfully receive 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 it is determined that the message B needs to be scheduled by using the RA-RNTI, the access network device sends the message B to the terminal separately, so that a HARQ mechanism can be used to receive feedback of the terminal on receiving the message B, and RARs of multiple terminals are prevented from being multiplexed into the same MAC PDU for transmission in an RA-RNTI scheduling scenario, thereby solving the problem that the message B scheduled by using the RA-RNTI in the related art cannot use the HARQ mechanism.

The identification information carried in the scheduling information is used for indicating that the message B is sent to the terminal independently, and the implementation mode of the identification information has at least two types:

1. the identification information is first identification information for identifying the terminal, and reference may be made to the embodiment shown in fig. 6 below;

2. the identification information is second identification information for identifying the message a, and reference may be made to the embodiment shown in fig. 7 as follows.

Fig. 6 shows a flow chart of a messaging method of a random access procedure shown in another exemplary embodiment. The present embodiment is illustrated with the method applied to the communication system as shown in fig. 4. The method specifically comprises the following steps.

Step 301, the terminal sends message a to the access network device.

Optionally, the random access preamble sequence is selected by the terminal from a plurality of 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, and when the message B needs RA-RNTI scheduling, the access network device generates scheduling information carrying the first identification information.

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

In an optional embodiment, when the message a does not carry the C-RNTI, the access network device further determines whether the message a carries the first CCCH SDU; and when the message A carries the first CCCH SDU, generating scheduling information carrying the first identification information, and subsequently and independently sending a message B to the terminal. And when the message A does not carry the first CCCH SDU, generating scheduling information which does not carry the first identification information, and then multiplexing RARs of a plurality of terminals on one MAC PDU for transmission.

When the message a carries the first CCCH SDU, it indicates that the UE is to initiate connection establishment, connection recovery, or connection reestablishment, and since the data size of the second CCCH SDU to be replied in the message B is large, the message B is not suitable for multiplexing transmission.

In an optional embodiment, when the message a does not carry the C-RNTI, the access network device further determines whether the message B needs to return to the message 2 in the four-step random access process; and when the message B does not need to return to the message 2 in the four-step random access process, generating scheduling information carrying the first identification information, and subsequently and independently sending the message B to the terminal. And when the message B needs to return to the message 2 in the four-step random access process, generating scheduling information which does not carry the first identification information, and performing subsequent transmission according to the four-step random access process.

In an optional embodiment, the method for the access network device to determine whether the message B needs to be returned to the message 2 in the four-step random access process may include, when the random access preamble sequence carried by the message a is successfully received and the identification information carried by the message a is successfully received, determining that the message B does not need to be returned to the message 2 in the four-step random access process; and when the random access leader sequence carried by the message A is successfully received and the identification information carried by the message A is not successfully received, determining that the message B needs to be returned to a message 2 in the four-step random access process.

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

when the message A carries S-TMSI, determining the S-TMSI as first identification information to be added into the scheduling information, or after truncating (front segment truncation or rear segment truncation or middle truncation) the S-TMSI, determining the truncated S-TMSI as the first identification information, wherein the truncated S-TMSI is a preset bit number;

when the message a carries the first random number, the first random number is determined as the first identification information and is added to the scheduling information, or after the first random number is truncated (front-segment truncation or rear-segment truncation or middle truncation), the truncated first random number is determined as the first identification information, and the truncated first random number is a preset bit number.

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

The access network equipment scrambles the scheduling information added with the first identification information by adopting RA-RNTI.

Step 303, the access network equipment sends the scheduling information.

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

Step 304, the terminal acquires the first identification information from the scheduling information, and 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 message sent to the terminal alone.

The terminal adopts RA-RNTI addressing (or descrambling) scheduling information, and after successfully receiving the scheduling information sent by the access network equipment, the terminal acquires the first identification information from the scheduling information.

When the first identification information is identical to the UE ID of itself, it is determined that the message B is separately transmitted. Or, when the first identification information is the same as the truncated UE ID of itself, it is determined that the message B is separately transmitted.

When the scheduling information does not carry the first identification information, determining that the message B is not sent independently; or when the scheduling information carries the first identification information and the first identification information is different from the UE ID of the scheduling information, determining that the message B is not sent independently; or, when the scheduling information carries the first identification information and the first identification information is different from the truncated UE ID, determining that the message B is not sent separately.

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

And step 306, the terminal receives the message B sent by the access network equipment according to the scheduling information.

Optionally, the terminal receives the message B by addressing with the RA-RNTI in the time-frequency resource location specified in the scheduling information.

And 307, when the message B is determined to be a message which is independently sent to the terminal, sending HARQ feedback of the message B to the access network equipment.

Step 308, the access network device receives the HARQ feedback.

And when the access network equipment receives the ACK, the terminal successfully receives the message B, and the random access process is completed. And when the access network equipment receives the NACK, the terminal does not successfully receive the message B and retransmits the message B.

In summary, in the method provided in this embodiment, the UE ID is used as the first identification information, which is convenient for the terminal to quickly determine whether the message B is sent separately, and simplifies the computational complexity of the terminal.

Because the number of bits that the scheduling information can carry is limited, the method provided in this embodiment may also use the truncated UE ID as the first identification information, which facilitates the transmission of the first identification information by the scheduling information with a small number of bits.

The method provided in this embodiment may further generate scheduling information carrying the first identifier information when the message a does not carry the C-RNTI and the message a carries the first CCCH SDU. This is because when the message a carries the first CCCH SDU, the message B usually carries the second CCCH SDU, which has a larger size, so the combined message B may also have a larger size, which is not suitable for the transmission method of multiplexing to the same MAC PDU, but is more suitable for the single transmission method.

The method provided in this embodiment may further generate scheduling information carrying the first identifier information when the message a does not carry the C-RNTI and the message B is not the message 2 in the fallback (fallback) to four-step random access process. This is because message B needs to be transmitted using a four-step random access procedure when falling back to message 2.

Fig. 7 is a flowchart illustrating a message transmission method of a random access procedure according to another exemplary embodiment. The present embodiment is illustrated with the method applied to the communication system as shown in fig. 4. The method specifically comprises 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 second random number has a number of bits less than 25 bits.

Optionally, the terminal generates the second random number by using a random number generation algorithm, or the terminal truncates (truncates in a front segment or a rear segment or truncates in a middle segment) the first random number and then uses the truncated first random number as the second random number.

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

Step 402, after receiving the message a, the access network device determines whether the message B needs RA-RNTI scheduling, and when the message B needs RA-RNTI scheduling, the access network device generates scheduling information carrying second identification information.

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

In an optional embodiment, when the message a does not carry the C-RNTI, the access network device further determines whether the message a carries the first CCCH SDU; and when the message A carries the first CCCH SDU, generating scheduling information carrying second identification information, and subsequently and independently sending a message B to the terminal. And when the message A does not carry the first CCCH SDU, generating scheduling information which does not carry the second identification information, and then multiplexing RARs of a plurality of terminals on one MAC PDU for transmission.

In an optional embodiment, when the message a does not carry the C-RNTI, the access network device further determines whether the message B needs to return to the message 2 in the four-step random access process; and when the message B does not need to return to the message 2 in the four-step random access process, generating scheduling information carrying the second identification information, and subsequently and independently sending the message B to the terminal. And when the message B needs to return to the message 2 in the four-step random access process, generating scheduling information which does not carry the second identification information, and performing subsequent transmission according to the four-step random access process.

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

and when the message A carries the random access leader sequence, determining a Preamble ID corresponding to the random access leader sequence as second identification information, and adding the Preamble ID to the scheduling information.

And when the message A carries the second random number, determining the second random number as being added to the scheduling information.

When the message a carries the first random number, truncating (front-segment truncation or rear-segment truncation or middle-segment truncation) the first random number, and then determining the truncated first random number as a second random number (i.e., second identification information), where the second random number is a preset number of bits, for example, less than 25 bits.

And the access network equipment scrambles the scheduling information added with the second identification information by adopting RA-RNTI.

Step 403, the access network equipment sends scheduling information.

In step 404, the terminal acquires the second identification information from the scheduling information, and determines that the message B is a message sent to the terminal alone when the second identification information corresponds to the information in the message a.

The terminal adopts RA-RNTI addressing (or descrambling) scheduling information, and after successfully receiving the scheduling information sent by the access network equipment, the terminal acquires second identification information from the scheduling information.

When the second identification information corresponds to the random access preamble sequence in the message a, it is determined that the message B is separately transmitted. Alternatively, 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 separately transmitted. Or, when the second identification information is the same as the truncated first random number, determining that the message B is sent separately, where the first random number is carried in the message a.

When the scheduling information does not carry the second identification information, determining that the message B is not sent independently; 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, determining that the message B is not separately sent.

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

And 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 separately sent to the terminal, sending HARQ feedback of the message B to the access network device.

In step 408, the access network device receives the HARQ feedback.

In summary, in the method provided in this embodiment, the random access preamble sequence or the first random number or the second random number in the message a is used to determine the second identification information, so that the terminal can quickly determine whether the message B is sent separately, thereby simplifying the computational complexity of the terminal.

Because the number of bits that the scheduling information can carry is limited, the method provided in this embodiment may also use the truncated first random number as the second identification information, which facilitates the transmission of the second identification information by the scheduling information with a small number of bits.

Because the number of bits that the scheduling information can carry is limited, the method provided in this embodiment may also use a second random number generated by a random number generation algorithm as the second identification information, so that the scheduling information may complete transmission of the second identification information with a small number of bits.

The method provided in this embodiment may further generate scheduling information carrying second identifier information when the message a does not carry the C-RNTI and the message a carries the first CCCH SDU. This is because when the message a carries the first CCCH SDU, the message B usually carries the second CCCH SDU, which has a larger size, so the combined message B may also have a larger size, which is not suitable for the transmission method of multiplexing to the same MAC PDU, but is more suitable for the single transmission method.

The method provided in this embodiment may further generate scheduling information carrying second identifier information when the message a does not carry the C-RNTI and the message B is not the message 2 in the fallback (fallback) to four-step random access process. This is because message B needs to be transmitted using a four-step random access procedure when falling back to message 2.

Fig. 8 is a block diagram illustrating a message transmitting apparatus for a random access procedure in accordance with an example embodiment. The device has the function of realizing the terminal in the method embodiment, and the function can be realized by hardware or by executing corresponding software by hardware. The apparatus 700 may include: a transmitting module 710, a receiving module 720 and a processing module 730.

A sending module 710 configured to send the message a to an access network device;

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

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

the sending module 720 is configured to send 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 sent to the terminal alone.

Optionally, the device further comprises

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

the processing module 730 is configured to determine that the message B is a message separately sent to the terminal 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.

Optionally, the first identification information includes:

a temporary mobile subscriber identity, S-TMSI;

or, a cell radio network temporary identifier C-RNTI;

or, a first random number;

or, said S-TMSI after truncation;

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 separately sent to the terminal 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 by the message A;

or, a second random number.

Optionally, the apparatus further comprises:

the processing module 730 configured to generate a first random number to be added to the message a;

or, the processing module 730 is configured to generate a second random number to be added 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 the second random number 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;

In another aspect, there is provided a message transmitting apparatus in a random access procedure, for use in a two-step random access procedure using a message a and a message B, with reference to fig. 8, the apparatus including:

a receiving module 720, configured to receive the message a sent by the terminal;

a processing module 730, configured to, when the message B needs to be scheduled using RA-RNTI, generate scheduling information addressed by the RA-RNTI, where the scheduling information is used to schedule a time-frequency resource location of the message B;

a transmitting module 710 configured to transmit the message B to the terminal separately by using a HARQ mechanism.

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

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

Optionally, the first identification information includes:

S-TMSI；

or, C-RNTI;

or, a first random number;

or, the S-TMSI after truncation;

or, the truncated first random number;

Optionally, the processing module 730 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 730 scrambles the scheduling information using the RA-RNTI.

Optionally, the second identification information includes:

the message A carries a preamble ID corresponding to a random access leader sequence;

or, a 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 truncate the first random number into the second random number.

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

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

Fig. 9 is a schematic structural diagram of a terminal according to an exemplary embodiment of the present disclosure, where 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 one communication component, which may be a communication chip.

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

The memory 104 may be configured to store at least one instruction for execution by the processor 101 to implement the various steps in the above-described method embodiments.

Further, the memory 104 may be implemented by any type or combination of volatile or non-volatile storage devices, including, but not limited to: magnetic or optical disks, electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), Static Random Access Memory (SRAM), read-only memory (ROM), magnetic memory, flash memory, programmable read-only memory (PROM).

In an exemplary embodiment, a non-transitory computer-readable storage medium comprising instructions, such as a memory comprising instructions, executable by a processor of a terminal to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

A non-transitory computer-readable storage medium, wherein instructions, when executed by a processor of a terminal, enable the terminal to perform the above-described message sending method of the random access procedure.

Fig. 10 is a block diagram illustrating an access network apparatus 1000 in accordance with an example embodiment.

The access network apparatus 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 connected to the processor 1001 through buses, respectively.

The processor 1001 includes one or more processing cores, and the processor 1001 executes the software programs and the modules to perform the methods performed in the transmission configuration method provided by the embodiments of the present disclosure. The memory 1004 may be used to store software programs and modules. In particular, memory 1004 can store an operating system 10041, and application modules 10042 required for at least one function. The receiver 1002 is configured to receive communication data sent by another device, and the transmitter 1003 is configured to send communication data to another device.

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

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A message sending method in a random access process is characterized by comprising the following steps:

the terminal sends a message A to the access network equipment;

the terminal receives scheduling information sent by the access network equipment by adopting random access radio network temporary identifier RA-RNTI addressing, wherein the scheduling information is used for scheduling the time-frequency resource position of the message B;

and the terminal sends the HARQ feedback of the message B to the access network equipment when determining that the message B is the message which is sent to the terminal independently.

2. The method of claim 1, wherein the terminal sends the HARQ feedback of the message B to the access network device when determining that the message B is a message sent to the terminal alone, and wherein the method comprises:

and the terminal determines that the message B is a message which is independently sent to the terminal 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.

3. The method of claim 2, wherein the first identification information comprises:

a temporary mobile subscriber identity, S-TMSI;

or the like, or, alternatively,

a cell radio network temporary identifier C-RNTI;

or the like, or, alternatively,

a first random number;

or the like, or, alternatively,

(ii) the S-TMSI after truncation;

or the like, or, alternatively,

the truncated first random number;

4. The method of claim 1, wherein the terminal sends the HARQ feedback of the message B to the access network device when determining that the message B is a message sent to the terminal alone, and wherein the method comprises:

5. The method of claim 4, wherein the second identification information comprises:

or the like, or, alternatively,

a second random number.

6. The method of claim 5, further comprising:

or the like, or, alternatively,

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

or the like, or, alternatively,

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

or the like, or, alternatively,

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;

7. A message sending method in a random access process is characterized by comprising the following steps:

the access network equipment receives a message A sent by a terminal;

the access network equipment adopts an HARQ mechanism to independently send the message B to the terminal;

and the message B is used for triggering the terminal to send the HARQ feedback of the message B to the access network equipment.

8. The message sending method of claim 7, wherein the generating, by the access network device, the scheduling information addressed by the RA-RNTI comprises:

9. The method according to claim 8, wherein the first identification information includes:

a temporary mobile subscriber identity, S-TMSI;

or the like, or, alternatively,

a cell radio network temporary identifier C-RNTI;

or the like, or, alternatively,

a first random number;

or the like, or, alternatively,

(ii) the S-TMSI after truncation;

or the like, or, alternatively,

the truncated first random number;

10. The message sending method of claim 7, wherein the generating, by the access network device, the scheduling information addressed by the RA-RNTI comprises:

11. The message transmission method according to claim 10, wherein the second identification information includes:

or, a second random number.

12. The method according to claim 11, further comprising:

acquiring the second random number from the message A;

or the like, or, alternatively,

and acquiring a first random number from the message A, and truncating the first random number into the second random number.

13. The method according to any of claims 7 to 12, characterized in that the method further comprises:

and when the message A carries a first common control channel service data unit (CCCH SDU), determining that the message B needs to adopt the RA-RNTI scheduling.

14. The method according to any of claims 7 to 12, characterized in that the method further comprises: and when the message A does not carry the C-RNTI of the terminal and the message B does not need to return to the message 2 in the four-step random access process, determining that the message B needs to adopt the RA-RNTI scheduling.

15. An apparatus for sending a message in a random access procedure, the apparatus comprising:

a sending module configured to send a message a to an access network device;

the sending module is configured to send hybrid automatic repeat request (HARQ) feedback of the message B to the access network device when the message B is determined to be a message which is sent to a terminal separately.

16. The apparatus of claim 15, further comprising:

17. The apparatus of claim 16, wherein the first identification information comprises:

a temporary mobile subscriber identity, S-TMSI;

or the like, or, alternatively,

a cell radio network temporary identifier C-RNTI;

or the like, or, alternatively,

a first random number;

or the like, or, alternatively,

(ii) the S-TMSI after truncation;

or the like, or, alternatively,

the truncated first random number;

18. The apparatus of claim 15, further comprising:

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

19. The apparatus of claim 18, wherein the second identification information comprises:

or the like, or, alternatively,

a second random number.

20. The apparatus of claim 19,

the processing module is configured to generate a first random number to be added to the message A;

or the like, or, alternatively,

the processing module is configured to generate a second random number to be added to the message A;

or the like, or, alternatively,

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

or the like, or, alternatively,

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;

21. An apparatus for sending a message in a random access procedure, the apparatus comprising:

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

a transmitting module configured to transmit the message B to the terminal separately by using an HARQ mechanism;

22. The message sending apparatus of claim 21,

the processing module is configured to generate scheduling information carrying first identification information, where the first identification information is a UE ID of the terminal, or the first identification information is a truncated UE ID;

23. The message transmission apparatus according to claim 22, wherein the first identification information comprises:

a temporary mobile subscriber identity, S-TMSI;

or the like, or, alternatively,

a cell radio network temporary identifier C-RNTI;

or the like, or, alternatively,

a first random number;

or the like, or, alternatively,

(ii) the S-TMSI after truncation;

or the like, or, alternatively,

the truncated first random number;

24. The message sending apparatus of claim 21,

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;

25. The message transmission apparatus according to claim 24, wherein the second identification information comprises:

or the like, or, alternatively,

a second random number.

26. The message sending apparatus of claim 25,

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

or the like, or, alternatively,

the processing module is configured to obtain a first random number from the message a, and truncate the first random number into the second random number.

27. Message sending device according to one of the claims 21 to 26,

the processing module is configured to determine that the message B needs to be scheduled by using the RA-RNTI when the message a carries a first common control channel service data unit, CCCH SDU.

28. Message sending device according to one of the claims 21 to 26,

and the processing module is configured to determine that the message B needs to adopt the RA-RNTI scheduling when the message A does not carry the C-RNTI of the terminal and the message B does not need to return to the message 2 in the four-step random access process.

29. A terminal, characterized in that the terminal comprises:

a processor;

a transceiver coupled 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 procedure according to any one of claims 1 to 6.

30. An access network device, characterized in that the access network device comprises:

a processor;

a transceiver coupled 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 procedure according to any one of claims 7 to 14.

31. A computer-readable storage medium, having at least one instruction, at least one program, a set of codes, or a set of instructions stored therein, which is loaded and executed by a processor to implement the method according to any one of claims 1 to 6, or the method according to any one of claims 7 to 14.