CN108811119B

CN108811119B - Random access method, equipment and system

Info

Publication number: CN108811119B
Application number: CN201710313802.1A
Authority: CN
Inventors: 于海凤; 熊新; 蔺波; 于峰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-05-05
Filing date: 2017-05-05
Publication date: 2021-06-08
Anticipated expiration: 2037-05-05
Also published as: CN108811119A

Abstract

The embodiment of the invention discloses a random access method, equipment and a system. The random access method comprises the following steps: the terminal device sends the first preamble to the access network device. And the terminal equipment receives a random access response message sent by the access network equipment, wherein the random access response message comprises a backoff indication and parameter information, the backoff indication indicates a time value, and the parameter information is used for the terminal equipment to determine the waiting time. And the terminal equipment determines the waiting time according to the back-off indication or the back-off indication and the parameter information. And the terminal equipment transmits a second lead code to the access network equipment after delaying the first time. Therefore, the terminal equipment can initiate random access according to the requirement of the priority of the random access, thereby meeting the requirement of low time delay.

Description

Random access method, equipment and system

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a random access method, device, and system.

Background

In the fourth Generation (4th Generation, 4G) mobile communication, the terminal device and the access network device need to perform data transmission while maintaining synchronization, thereby ensuring the accuracy of data transmission. Random Access (RA) procedures are an important way for terminal devices to keep synchronized with Access network devices. Taking Long Term Evolution (LTE) system as an example, there are two different ways for the random access process: Non-Contention based (Non-Contention based) random access and Contention based (Contention based) random access.

In the initial stage of the random access procedure, the terminal device sends a preamble to the access network device. One purpose of the terminal device sending the preamble is to enable the access network device to estimate the transmission delay with the terminal device. And then, the access network equipment sends the calibration information to the terminal equipment, and the terminal equipment adjusts the internal clock according to the calibration information so as to realize synchronization with the access network equipment.

In a contention-based random access procedure, a plurality of terminal devices randomly select respective preambles in a shared preamble set. One possible problem is that multiple terminal devices select the same preamble to initiate the random access procedure. In this case, contention may occur between the plurality of terminal devices, and at most only one terminal device may be successfully accessed. The terminal equipment which fails in the random access needs to wait for a period of time and then re-initiate the random access.

When the Access network device sends a Random Access Response (RAR) message to the terminal device, the Access network device may send a Backoff Indication (BI) at the same time. The backoff indicator indicates a time value. The terminal equipment which fails in the random access randomly selects a value from 0 to the time value as the waiting time, and re-initiates the random access after the waiting time.

As 4G mobile wireless communication enters the commercial-scale phase, the future-oriented fifth Generation (5th Generation, 5G) mobile communication has become a global research and development hotspot. One class of application scenarios for 5G mobile Communications is Low-Latency and Low Latency Communications (URLLC). URLLC traffic is very demanding with respect to latency, and generally requires that the random access procedure can be completed quickly once the random access is triggered.

The 5G mobile communication follows the aforementioned random access procedure to guarantee the accuracy of data transmission. However, in the existing random access process, the terminal device randomly determines the waiting time according to the backoff indicator sent by the access network device, and this way cannot guarantee that the waiting time of the URLLC service is short, so that the priority access can be performed when the random access is reinitiated. Therefore, the existing random access procedure cannot meet the requirements of 5G mobile communication services, especially the low delay requirement of URLLC services.

Disclosure of Invention

Embodiments of the present invention provide a random access method, device, and system, which can enable a terminal device to determine different waiting times according to actual requirements, so as to meet a requirement of low latency.

In one aspect, an embodiment of the present invention provides a random access method. The method comprises the following steps: the terminal device sends the first preamble to the access network device. And the terminal equipment receives a random access response message sent by the access network equipment, wherein the random access response message comprises a backoff indication and parameter information, the backoff indication indicates a time value, and the parameter information is used for the terminal equipment to determine the waiting time. And the terminal equipment determines the waiting time according to the back-off indication or the back-off indication and the parameter information. And the terminal equipment transmits a second preamble to the access network equipment after delaying a first time, wherein the first time is less than or equal to the waiting time, and the second preamble is the same as or different from the first preamble. Therefore, the terminal equipment can determine the waiting time according to the priority of the initiated random access, the backoff indication configured by the access network equipment and the parameter information, so that the random access can be restarted according to the requirements of different random access priorities, and the requirement of low time delay is met.

In one possible design, the determining, by the terminal device, the waiting time according to the backoff indicator and the parameter information includes: the terminal device determines the waiting time according to the priority of the initiated random access, the parameter information and the backoff indication, wherein the parameter information indicates a correction value or a parameter associated with a predetermined algorithm, and the first time is greater than or equal to 0 and less than or equal to the waiting time.

In one possible design, the parameter information indicates at least two correction values. The terminal device determines the waiting time according to the back-off indication and the parameter information, and the method comprises the following steps: and the terminal equipment determines a first correction value according to the priority of the initiated random access, wherein the first correction value is one of the at least two correction values. And the terminal equipment determines the waiting time according to the backoff indication and the first correction value, wherein the first time is greater than or equal to 0 and less than or equal to the waiting time.

In one possible design, the parameter information indicates at least two parameters associated with a predetermined algorithm. The terminal device determines the waiting time according to the back-off indication and the parameter information, and the method comprises the following steps: and the terminal equipment determines a first parameter according to the priority of the initiated random access, wherein the first parameter is one of the at least two parameters. The terminal device determines the wait time according to a predetermined algorithm associated with the first parameter, wherein the first time is equal to the wait time.

In one possible design, the parameter information indicates a correction value or a parameter associated with a predetermined algorithm. The terminal equipment determines the waiting time according to the back-off indication, and the method comprises the following steps: the terminal device determines not to use the modification value or the parameter associated with the predetermined algorithm according to the priority of the initiated random access. Wherein the waiting time is equal to the indication time value, and the first time is greater than or equal to 0 and less than or equal to the waiting time.

In another aspect, an embodiment of the present invention provides a random access method. The method comprises the following steps: the terminal equipment sends a lead code to the access network equipment, wherein the lead code indicates the priority of random access. And the terminal equipment receives a random access response message sent by the access network equipment, wherein the random access response message comprises a backoff indication and parameter information, the backoff indication indicates a time value, and the parameter information corresponds to the priority of the random access. And the terminal equipment determines the waiting time according to the back-off indication and the parameter information. Therefore, the access network equipment can configure corresponding parameter information according to the priority of random access initiated by the terminal equipment, and the terminal equipment is ensured to reinitiate random access according to the requirements of different random access priorities while simplifying the indication of the parameter information, thereby meeting the requirement of low time delay.

In one possible design, the parameter information indicates a correction value. The terminal device determining the waiting time according to the backoff instruction and the parameter information comprises: and the terminal equipment determines a first correction value according to the priority of the initiated random access. And the terminal equipment determines the waiting time according to the backoff indication and the first correction value.

In one possible design, the parameter information indicates a parameter associated with a predetermined algorithm. The terminal device determining the waiting time according to the backoff instruction and the parameter information comprises: and the terminal equipment determines a first parameter according to the initiated priority of random access. The terminal device determines the wait time according to a predetermined algorithm associated with the first parameter.

In yet another aspect, an embodiment of the present invention provides a random access method. The method comprises the following steps: the terminal equipment sends a lead code to the access network equipment, wherein the lead code indicates the priority of random access. And the terminal equipment receives a random access response message sent by the access network equipment, wherein the random access response message comprises a backoff indication, the backoff indication indicates a time value, and the backoff indication corresponds to the priority of the random access. And the terminal equipment determines the waiting time according to the initiated priority of the random access and the backoff indication, wherein the waiting time is less than or equal to the indication time value. Therefore, the access network equipment can configure the corresponding backoff indication according to the priority of the random access initiated by the terminal equipment, so that the terminal equipment can reinitiate the random access according to the requirements of different random access priorities, thereby meeting the requirement of low time delay

In one possible design, before the terminal device sends the preamble to the access network device, the method further includes: the terminal equipment determines a first preamble set according to the priority of the initiated random access. The terminal device selects the preamble in the first set of preambles.

In one possible design, the determining, by the terminal device, the first preamble set according to the priority of the initiated random access includes: and the terminal equipment determines to receive the downlink wave beam of the random access response message and determines an auxiliary synchronous block according to the auxiliary synchronous block information for identifying the downlink wave beam. And the terminal equipment determines a corresponding lead code set according to the auxiliary synchronization block. The terminal device determines the first preamble set in the preamble set according to the priority of the initiated random access.

In yet another aspect, an embodiment of the present invention provides a random access method. The method comprises the following steps: the terminal device sends the first preamble to the access network device. And the terminal equipment receives a random access response message sent by the access network equipment, wherein the random access response message comprises at least two backoff indicators, and the backoff indicators indicate time values. And the terminal equipment determines waiting time according to the back-off indication, wherein the waiting time is one of the time values of the at least two back-off indication indications. And the terminal equipment transmits a second preamble to the access network equipment after delaying a first time, wherein the first time is less than or equal to the waiting time, and the second preamble is the same as or different from the first preamble. Therefore, the access network device can configure backoff instructions corresponding to all random access priorities for the terminal device, and the terminal device can determine corresponding backoff instructions according to the requirements of different random access priorities and reinitiate random access, thereby meeting the requirement of low time delay.

In yet another aspect, an embodiment of the present invention provides a random access method. The method comprises the following steps: and the access network equipment receives the first lead code sent by the terminal equipment. The access network equipment sends a random access response message to the terminal equipment, wherein the random access response message comprises a backoff indication and at least one parameter information, the backoff indication indicates a time value, and the at least one parameter information is used for the terminal equipment to determine the waiting time. And the access network equipment receives a second lead code which is sent by the terminal equipment after delaying a first time, wherein the first time is less than or equal to the waiting time, and the second lead code is the same as or different from the first lead code.

In yet another aspect, an embodiment of the present invention provides a random access method. The method comprises the following steps: the access network equipment receives a lead code sent by the terminal equipment, wherein the lead code indicates the priority of random access. And the access network equipment determines the priority of random access initiated by the terminal equipment according to the lead code. The access network equipment sends a random access response message to the terminal equipment, wherein the random access response message comprises a backoff indication and parameter information, the backoff indication indicates a time value, and the parameter information corresponds to the priority of the random access.

In one possible design, the parameter information indicates a correction value or a parameter associated with a predetermined algorithm.

In yet another aspect, an embodiment of the present invention provides a random access method. The method comprises the following steps: the access network equipment receives a lead code sent by the terminal equipment, wherein the lead code indicates the priority of random access. And the access network equipment determines the priority of random access initiated by the terminal equipment according to the lead code. The access network equipment sends a random access response message to the terminal equipment, wherein the random access response message comprises a backoff indication, the backoff indication indicates a time value, and the backoff indication corresponds to the priority of the random access.

In yet another aspect, an embodiment of the present invention provides a random access method. The method comprises the following steps: and the access network equipment receives the first lead code sent by the terminal equipment. The access network equipment sends a random access response message to the terminal equipment, wherein the random access response message comprises at least two backoff indications, the backoff indications indicate time values, the backoff indications are used for the terminal equipment to determine waiting time, and the waiting time is one of the time values indicated by the at least two backoff indications. And the access network equipment receives a second lead code which is sent by the terminal equipment after delaying a first time, wherein the first time is less than or equal to the waiting time, and the second lead code and the first lead code are the same or different.

In another aspect, an embodiment of the present invention provides a terminal device, including: and the transceiving unit is used for sending the first preamble to the access network equipment. The transceiver unit is further configured to receive a random access response message sent by the access network device, where the random access response message includes a backoff indicator and parameter information, the backoff indicator indicates a time value, and the parameter information is used by the terminal device to determine a waiting time. And the processing unit is used for determining the waiting time according to the back-off indication or according to the back-off indication and the parameter information. The transceiver unit is further configured to transmit a second preamble to the access network device after delaying a first time, where the first time is less than or equal to the waiting time, and the second preamble is the same as or different from the first preamble.

In another aspect, an embodiment of the present invention provides a terminal device, including: a transceiving unit, configured to send a preamble to an access network device, where the preamble indicates a priority of random access. The transceiver unit is further configured to receive a random access response message sent by the access network device, where the random access response message includes a backoff indicator and parameter information, the backoff indicator indicates a time value, and the parameter information corresponds to a priority of the random access. And the processing unit is used for determining the waiting time according to the back-off indication and the parameter information.

In another aspect, an embodiment of the present invention provides a terminal device, including: a transceiving unit, configured to send a preamble to an access network device, where the preamble indicates a priority of random access. The transceiver unit is further configured to receive a random access response message sent by the access network device, where the random access response message includes a backoff indicator, the backoff indicator indicates a time value, and the backoff indicator corresponds to a priority of the random access. And the processing unit is used for determining the waiting time according to the initiated priority of the random access and the backoff instruction.

In another aspect, an embodiment of the present invention provides a terminal device, including: and the transceiving unit is used for sending the first preamble to the access network equipment. The transceiver unit is further configured to receive a random access response message sent by the access network device, where the random access response message includes at least two backoff indicators, and the backoff indicators indicate time values. And the processing unit is used for determining waiting time according to the backoff indicator, wherein the waiting time is one of the time values of the at least two backoff indicator indicators. The transceiver unit is further configured to transmit a second preamble to the access network device after delaying a first time, where the first time is less than or equal to the waiting time, and the second preamble is the same as or different from the first preamble.

In one possible design, the terminal device may implement the function of the terminal device behavior in the above method through hardware. The terminal device may include a transceiver and a processor in its structure. The transceiver may implement the functions of the transceiving unit. The processor may implement the functions of the processing unit.

In a possible design, the terminal device may also implement the function of the terminal device behavior in the above method by executing corresponding software through hardware. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

In another aspect, an embodiment of the present invention provides an access network device, including: and the transceiving unit is used for receiving the first lead code sent by the terminal equipment. A processing unit, configured to determine a random access response message, where the random access response message includes a backoff indicator and at least one parameter information, where the backoff indicator indicates a time value, and the at least one parameter information is used for the terminal device to determine a waiting time. The transceiver unit is further configured to send the random access response message to the terminal device. The transceiver unit is further configured to receive a second preamble that is sent by the terminal device after a first time is delayed, where the first time is less than or equal to the waiting time, and the second preamble is the same as or different from the first preamble.

In another aspect, an embodiment of the present invention provides an access network device, including: the terminal device comprises a transceiving unit and a control unit, wherein the transceiving unit is used for receiving a lead code sent by the terminal device, and the lead code indicates the priority of random access. And the processing unit is used for determining a random access response message, wherein the random access response message comprises a backoff indication and parameter information, the backoff indication indicates a time value, and the parameter information corresponds to the priority of the random access. The transceiver unit is further configured to send the random access response message to the terminal device.

In another aspect, an embodiment of the present invention provides an access network device, including: the terminal device comprises a transceiving unit and a control unit, wherein the transceiving unit is used for receiving a lead code sent by the terminal device, and the lead code indicates the priority of random access. And the processing unit is used for determining the priority of the random access initiated by the terminal equipment according to the lead code. The transceiver unit is further configured to send a random access response message to the terminal device, where the random access response message includes a backoff indicator, the backoff indicator indicates a time value, and the backoff indicator corresponds to a priority of the random access.

In another aspect, an embodiment of the present invention provides an access network device, including: and the transceiving unit is used for receiving the first lead code sent by the terminal equipment. A processing unit, configured to determine a random access response message, where the random access response message includes at least two backoff indicators, where the backoff indicators indicate time values, and the backoff indicators are used by the terminal device to determine a waiting time, where the waiting time is one of the time values indicated by the at least two backoff indicators. The transceiver unit is further configured to send the random access response message to the terminal device. The transceiver unit is further configured to receive a second preamble that is sent by the terminal device after a first time is delayed, where the first time is less than or equal to the waiting time, and the second preamble and the first preamble are the same or different.

In one possible design, the access network device may implement, through hardware, the function of the behavior of the access network device in the above method. The access network device may include a processor and a transceiver in its structure. The processor may implement the functions of the processing unit. The transceiver may implement the functions of the transceiving unit.

In a possible design, the access network device may also implement the function of the behavior of the access network device in the above method by executing corresponding software through hardware. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

In yet another aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the method according to the above aspects.

In another aspect, an embodiment of the present invention provides a communication system, where the communication system includes the terminal device and the access network device in the foregoing aspect.

In another aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for the terminal device, which includes a program for controlling the terminal device to execute the above aspects.

In still another aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for the access network device, which includes a program for controlling the access network device to execute the above aspects.

In a further aspect, an embodiment of the present invention provides a computer program product containing instructions which, when run on a computer, cause the computer to perform the method of any of the preceding aspects.

According to the technical scheme provided by the embodiment of the invention, the access network equipment configures the terminal equipment with the parameter information or the backoff indication corresponding to the random access priority, so that the terminal equipment can determine different waiting time according to actual requirements, and the requirement of low time delay can be met.

Drawings

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a contention-based random access procedure according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a MAC PDU according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a random access method according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a random access method according to another embodiment of the present invention;

fig. 6 is a schematic diagram of a random access method according to another embodiment of the present invention;

fig. 7 is a schematic structural diagram of another MAC PDU according to an embodiment of the present invention;

FIG. 8 is a diagram illustrating a structure of a MAC subheader with a BI field according to an embodiment of the present invention;

fig. 9 is a diagram illustrating a random access method according to still another embodiment of the present invention;

fig. 10 is a diagram illustrating a random access method according to still another embodiment of the present invention;

fig. 11 is a diagram illustrating a random access method according to still another embodiment of the present invention;

fig. 12 is a schematic diagram of a possible structure of a terminal device according to an embodiment of the present invention;

fig. 13 is a schematic diagram of a possible structure of a terminal device according to another embodiment of the present invention;

fig. 14 is a schematic diagram of a possible structure of an access network device according to an embodiment of the present invention;

fig. 15 is a schematic diagram of a possible structure of an access network device according to another embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be described below with reference to the accompanying drawings.

The technical solution of the embodiment of the present invention is based on the communication system 100 shown in fig. 1. The communication system 100 may support services with low latency requirements, such as URLLC services. It will be appreciated that the communication system 100 also supports services requiring regular latency. The communication system 100 comprises an access network device and at least one terminal device. As shown in fig. 1, the communication system 100 includes, for example, an access network device 10 and

terminal devices

20 and 30. The

terminal device

20, 30 may synchronize with the access network device 10 through a random access procedure. Thereafter, transmission of control information and data between the

terminal device

20, 30 and the access network device 10 may be performed.

It should be understood that, in the embodiment of the present invention, the communication System 100 may be a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (LTE) System, a LTE Frequency Division Duplex (FDD) System, a LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), other wireless communication systems using Orthogonal Frequency Division (OFDM) technology, and the like. Furthermore, the communication system 100 may also be adapted for 5G mobile communication. The system architecture and the service scenario described in the embodiment of the present invention are for more clearly illustrating the technical solution of the embodiment of the present invention, and do not form a limitation on the technical solution provided in the embodiment of the present invention, and it can be known by those skilled in the art that the technical solution provided in the embodiment of the present invention is also applicable to similar technical problems along with the evolution of the network architecture and the appearance of a new service scenario.

It should also be understood that, in the embodiment of the present invention, a Terminal device may also be referred to as a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (Mobile Terminal), and the like, and the Terminal device may communicate with one or more core networks via a Radio Access Network (RAN), for example, the Terminal device may be a Mobile phone (or referred to as a "cellular" phone), a computer with a Mobile Terminal, and the like, and for example, the Terminal device may also be a portable, pocket, hand-held, computer-built-in, or vehicle-mounted Mobile apparatus, and they exchange signaling and/or data with the Radio Access Network.

In the embodiment of the present invention, the access network device may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB, NB) in WCDMA, an evolved Node B (eNB or e-NodeB) in LTE, or a new generation access network device in a 5G system. The embodiment of the invention does not specifically limit the access network equipment and the terminal equipment.

It should be noted that the number of terminal devices included in the communication system 100 shown in fig. 1 is merely an example, and the embodiment of the present invention is not limited thereto. For example, more terminal devices communicating with the access network device may be included, and are not depicted in the figures one by one for the sake of brevity. Furthermore, in the communication system 100 shown in fig. 1, although the access network device 10 and the

terminal devices

20 and 30 are shown, the communication system 100 may not be limited to include the access network device and the terminal devices, but may also include, for example, a core network device or a device for carrying virtualized network functions, etc., which are obvious to those skilled in the art and are not described in detail herein.

As mentioned above, the terminal device maintains synchronization with the access network device through the random access procedure, so that control information and/or data can be transmitted with the access network device. Taking the LTE system as an example, the main scenarios that the terminal device needs to initiate the random access process are as follows:

1) initial access: the terminal device is converted from a Radio Resource Control (RRC) IDLE (IDLE) state RRC _ IDLE to an RRC CONNECTED state RRC _ CONNECTED, and establishes a connection with the access network device using a random access procedure.

2) RRC connection reconnection procedure.

3) Handover (handover) procedure.

4) In the RRC connected state, when downlink (direction from the access network device to the terminal device) data arrives, the terminal device and the access network device are in an asynchronous state of uplink (direction from the terminal device to the access network device).

5) In an RRC connected state, when uplink data arrives (for example, the terminal device sends a measurement report or user data), the terminal device and the access network device are in an uplink (direction from the terminal device to the access network device) asynchronous state; or, the terminal device has no available Physical Uplink Control Channel (PUCCH) resource for transmitting a Scheduling Request (SR).

In 5G mobile communication, in addition to the above scenario, the terminal device may also initiate a random access procedure in a new scenario. Some possible new scenarios are as follows:

1) when the UE meets a certain condition (for example, no communication is carried out between the idle state and the gNB for a long time), the connection state can be switched to the inactive state, and compared with the idle state, the inactive state can be more quickly switched to the connection state.

2) When the terminal equipment is in an inactive (inactive) state, uplink data arrives, and the terminal equipment and the access network equipment are in an uplink asynchronous state.

3) The terminal device requests an On-demand (On-demand) System message SI (SI).

Through the random access process, the access network equipment can calibrate the uplink time and send the calibration information to the terminal equipment. And the terminal equipment adjusts an internal clock according to the calibration information so as to keep synchronization with the access network equipment. Fig. 2 shows a contention-based random access scheme. In this approach, the terminal device selects a preamble for transmission from a preamble resource pool preconfigured by the access network device. The contention-based random access generally includes the following main processes:

s201, initializing random access.

The terminal device receives random access configuration information sent by the access network device, where the configuration information may be sent through a broadcast message, a Radio Resource Control (RRC) message, or other messages, and a specific sending manner is not limited, where the configuration information mainly includes:

PRACH-ConfigIndex set of PRACH resources available for transmission of random access preambles

-groups of available random access preambles and sets of preambles available in each group

Preamble maximum transmission times preambleTransMax

Preamble initial transmit power preambilnitial receivedtargetpower

Power step up step powerRampingStep

-random access response window ra-ResponsewindowSize

Hybrid Automatic Repeat reQuest (HARQ) maximum retransmission times maxHARQ-Msg3 of Msg3

Contention resolution timer mac Contention resolution timer

In addition, in consideration of beam (beam) characteristics introduced in 5G communication, the random access configuration information may further include a Secondary Synchronization block (SS block), and a correspondence relationship between a preamble set and/or PRACH resources. After the terminal device determines the received beam of the random access response through measurement, the terminal device may determine a corresponding preamble set by using the SS block for identifying the beam and a pre-stored correspondence between the SS block and the preamble set.

It should be noted that the terminal device may update the initialization information before triggering random access each time.

S202, the terminal device sends a preamble (Msg1) to the access network device.

And the terminal equipment selects a lead code from the lead code set included in the initialization information and sends the lead code to the access network equipment through the PRACH. Multiple terminal devices may share a set of preambles. The preamble is commonly referred to as Msg1, the message of the first step of the random access procedure. One purpose of the preamble is to inform the access network device of a random access request, so that the access network device can estimate the transmission delay with the terminal device.

Thereafter, the terminal device may monitor an RAR carrying a preamble index within a Random Access Response (RAR) time window.

S203, the access network equipment sends RAR (Msg2) to the terminal equipment.

The access network device sends an RAR to the terminal device through a Physical Downlink Shared Channel (PDSCH). The Access network device may carry the RAR in a Media Access Control (MAC) Protocol Data Unit (PDU). If a plurality of terminal devices send respective preambles through the same PRACH, the access network device multiplexes RARs for the plurality of terminal devices in the same MAC PDU.

Fig. 3 is a schematic diagram of a structure of a MAC PDU. The MAC PDU includes a MAC header (header) and a MAC Control Element (CE). The MAC header includes a plurality of MAC subheaders (subheaders). As shown in fig. 3, the subheaders 1 to n each include a RAPID field, which is a random access preamble index. RAPID in the subheader 1 to subheader n respectively correspond to preamble indexes of the terminal device 1 to the terminal device n. The MAC CE includes RAR corresponding to each preamble index in a MAC subheader. The MAC RAR 1 to MAC RAR n correspond to preamble indices in the subheader 1 to subheader n, respectively. The RAR includes a preamble index, a Timing Advance (TA) value used for uplink synchronization, uplink resource scheduling information required for sending Msg3, and a Cell Radio Network Temporary Identity (C-RNTI) specified by the access Network device for the terminal device. And the uplink resource indicated by the uplink resource scheduling information is allocated by the access network equipment according to the PRACH resource and the lead code for initiating the random access according to a preset criterion. That is, for terminal devices that initiate random access using the same preamble at the same PRACH location, the obtained uplink resources are the same.

After the terminal device sends the preamble, it will monitor the PDCCH within an RAR time window (RA Response window) to receive the MAC PDU containing the RAR. Specifically, the time-frequency position of the preamble sent by the terminal device determines a Random Access Resource Block Radio Network Temporary Identity (RA-RNTI) of the terminal device. And the terminal equipment monitors the corresponding PDCCH according to the RA-RNTI. One possible scenario is that multiple terminal devices transmit preambles to the access network device at the same time. However, the load capacity of the access network device may not be sufficient to support simultaneous access by all terminal devices. Therefore, the access network device only sends RAR to some terminal devices, that is, the MAC PDU only includes RAR for some terminal devices. And for the terminal equipment which does not receive the RAR, the random access is considered to be failed, and the random access is initiated after waiting for a period of time.

At this time, as shown in fig. 3, the MAC PDU further includes a MAC subheader (subheader), and the subheader includes a Backoff Indicator (BI). The backoff indicator indicates a time value. The terminal equipment which does not receive the RAR randomly selects a value from 0 to the time value as the waiting time, and re-initiates the random access after the waiting time.

S204, the terminal device receiving the RAR sends Msg3 to the access network device.

If the MAC PDU received by the terminal equipment contains the lead code sent by the terminal equipment, the terminal equipment adjusts an internal clock according to the TA contained in the received RAR corresponding to the lead code, so that the terminal equipment and the access network equipment are in uplink synchronization. And the terminal equipment determines the uplink resource required by Msg3 according to the received uplink resource scheduling information contained in the RAR. The Msg3 has no specific content, but contains different content according to different requirements of the terminal device for initiating random access. Generally, Msg3 may include the following table 1 according to the random access requirement.

TABLE 1 Msg3 under different scenarios

Random access requirement	Message type
		Initial access	RRC connection request
RRC connection reestablishment	RRC connection reestablishment request
		Handover	Handover messages
Downstream data arrival	C-RNTI MAC control unit
		Upstream data arrival	C-RNTI MAC control unit

S205, the terminal device receives a competition resolution message (Msg4) sent by the access network device.

One possible scenario is that in S202, multiple terminal devices select the same preamble from a common preamble set to transmit to the access network device. The access network device will indicate the same uplink resource for the plurality of terminal devices in the RAR. At this time, the plurality of terminal devices transmit Msg3 using the same uplink resource, and thus contention occurs. At most, only one terminal device among the competing terminal devices can successfully perform random access. At this time, the access network device transmits a contention resolution message to the plurality of terminal devices through the PDSCH.

The device on the terminal will start a timer after sending Msg 3. And if the terminal equipment does not receive the competition resolution message after the timing is up, the random access initiated by the terminal equipment at this time is considered to be failed.

The terminal equipment which fails in the random access randomly selects a value in the range from 0 to the time value as the waiting time according to the time value contained in the BI field in the received MAC PDU, and re-initiates the random access after the waiting time.

Through the above process, the terminal device completes the random access or re-initiates the random access after waiting for a period of time.

In the existing random access process, no matter what service scenario or service type the terminal device initiates random access, the access network device will execute the same random access process. Therefore, when the downlink resources are limited or the access network device is heavily loaded, part of the random access requests of the terminal devices may be discarded. In addition, for a terminal device with a failed random access, the access network devices will indicate an identical time value through a common BI field. That is, all terminal devices that fail random access can only select one random value from the range of 0 and the time value as the waiting time to reinitiate random access. The above situation is very disadvantageous for many services in 5G mobile communication, especially URLLC service with strict delay requirements.

Based on the above problem, in the random access method provided in the embodiment of the present invention, the access network device may configure a backoff indicator and configure a corresponding parameter value according to a priority of random access initiated by the terminal device, or the access network device configures a corresponding backoff indicator according to a priority of random access initiated by the terminal device. Therefore, the terminal equipment can determine different waiting times according to actual requirements, and the requirement of low time delay is met.

Fig. 4 is a schematic diagram illustrating a random access method according to an embodiment of the present invention in an interactive manner. The method provided by the present embodiment will be described in detail below with reference to fig. 4.

S401, the terminal device sends a first lead code to the access network device.

Correspondingly, the access network device receives the first preamble sent by the terminal device.

Wherein the terminal device may select the first preamble from a preamble set configured by the access network device in random access initialization as described in S202 in the random access procedure shown in fig. 2.

Optionally, the terminal device sends a plurality of the first preambles to the access network device. As described in S203 in the random access procedure shown in fig. 2, the terminal device may start a random access response time window after transmitting the first preamble. Thereafter, the terminal device may continuously transmit a plurality of preambles within the RAR time window.

The Access network device may configure a manner in which the terminal device transmits the plurality of first preambles, where the manner includes that the terminal device simultaneously transmits the plurality of first preambles, where the simultaneous transmission of the plurality of first preambles may be using different frequency domain resources and/or using the same frequency domain resource but using different first preambles, or the terminal device transmits the plurality of first preambles at different Random Access Channel (RACH) transmission timings, and at this time, the plurality of first preambles may be the same or different. The frequency domain resources and the uplink beams used for the plurality of first preamble transmissions may be the same or different.

The terminal equipment sends the lead codes for multiple times, so that the success probability of sending the lead codes is improved.

Considering different scenarios and purposes of random access in 5G communication, it is necessary to support differentiation of random access priorities, and different random access processes may be adopted for different random access priorities, for example, the terminal device opens an RAR time window after sending a random access preamble of an enhanced Mobile BroadBand (eMBB) service. Thereafter, the terminal device may experience bursty URLLC traffic. The terminal device may retransmit the random access preamble of the URLLC service within the RAR time window. Because the delay requirement of the URLLC service is severe, the terminal device may choose to cancel the random access procedure of the eMBB service, and the case where the high-priority random access cancels the low-priority random access includes:

(1) if the low priority random access is triggered but no PRACH resource is available, the low priority random access is cancelled.

(2) The low-priority random access is already sent, and at this time, the terminal device may choose not to receive the RAR of the low-priority random access, or ignore the RAR after receiving the RAR.

(3) Or the low priority random access is already sent, at this time, the terminal device may send a message to cancel the low priority random access, and the access network device may not receive the random access.

The preambles used by the random accesses with different priorities in the same RAR window may be different, but the preamble transmission manners are the same (for example, the preambles are transmitted once or multiple times in the RAR window).

S402, the access network equipment sends a random access response message to the terminal equipment.

Correspondingly, the terminal device receives the random access response message sent by the access network device.

Wherein the random access response message includes a backoff indicator and parameter information. The backoff indicator indicates a time value, and the parameter information is used for the terminal equipment to determine the waiting time.

Optionally, the parameter information indicates a correction value or a parameter associated with a predetermined algorithm.

Optionally, the random access response message is a MAC PDU.

Optionally, the random access response message further includes beam and/or resource usage attribute information used by the terminal to perform a backoff process, where the beam and/or resource usage attribute information is used by the terminal device to determine a backoff indication and a usage scenario of the parameter information.

S403, the terminal device determines the waiting time according to the back-off indication or according to the back-off indication and the parameter information.

S404, the terminal device sends a second preamble to the access network device after delaying the first time.

Wherein the first time is less than or equal to the wait time. The second preamble is a preamble for the terminal device to reinitiate random access, and the second preamble is the same as or different from the first preamble.

It is understood that the first time is one of the following lengths of time:

-a length of time since the random access response message was received by the terminal device.

-a length of time from after reception of said random access response message by said terminal device to reception of a contention resolution message by said terminal device.

-a length of time from when said random access response message is received by said terminal device to when a timer for receiving said contention resolution expires.

The terminal device may determine the waiting time according to the priority of the initiated random access, the parameter information, and the backoff indicator.

Optionally, the priority of the random access is divided according to an event that the terminal device initiates the random access. The random access event comprises the service type of the random access, the random access is used for message initial transmission or message retransmission and the like. For example, the access network device divides the random access of URLLC traffic with higher latency requirements and the random access of other traffic into different random access priorities. For another example, the access network device divides random access for message initial transmission and random access for message retransmission into different random access priorities.

The priority of the random access may also be divided according to Quality of Service (QoS) of the Service, in which the terminal device initiates the random access. For example, the access network device sets the random access with better QoS as a high priority and sets the random access with worse QoS as a low priority.

The priority of the random access may also be divided according to a resource usage attribute (numerology) selected by the terminal device to initiate the random access. The resource usage attribute comprises at least one of the following attributes:

-resource period. For example, the access network device divides the priority of the random access according to a resource period of 1ms, 2ms, and 5ms or a resource period of 1 Transmission Time Interval (TTI) length and 2 TTI lengths.

-TTI length. For example, the access network device may prioritize the random access according to a TTI length of 1ms TTI, 0.5ms TTI, or 1 Orthogonal Frequency Division Multiplexing (OFDM) symbol, and a TTI length of 2 OFDM symbols.

-subcarrier spacing. For example, the access network device divides the priority of the random access according to the subcarrier interval of 15KHz and 60 KHz.

-coding mode. For example, the access network device divides the priority of the random access according to a coding mode using a Turbo code, a Low-Density Parity-Check (LDPC) code, and a polarization (Polar) code.

-a multiple access mode. For example, the Access network device prioritizes the random Access according to a Multiple Access method of OFDM or Code Division Multiple Access (CDMA).

The number of subcarriers occupied by the frequency domain. For example, the access network device occupies 12 subcarriers according to the frequency domain, and 15 subcarriers divide the priority of the random access.

-whether or not frequency domain repeat transmission is performed. For the random access for frequency domain repeat transmission, the access network device may further divide the priority of the random access according to the frequency domain repeat transmission times.

-whether or not to perform a time domain repetition transmission. For the random access for time domain repeat transmission, the access network device may further divide the priority of the random access according to the time domain repeat transmission times.

The priority of the Random Access may also be divided according to a preamble used by the Random Access and/or a Physical Random Access Channel (PRACH) that transmits the Random Access.

It is to be understood that the priority of the random access may also be divided into multiple levels by combining the above-mentioned multiple division modes.

In a possible implementation manner, the random access response message includes a backoff indicator, and the parameter information indicates a parameter value. And the terminal equipment determines whether to use the parameter value according to the priority for initiating the random access.

For example, when the priority of the random access initiated by the terminal device is higher (e.g. higher than a preset priority), the terminal device uses the parameter value. When the priority of the random access initiated by the terminal device is lower (e.g. lower than a preset priority), the terminal device does not use the parameter value, and determines the waiting time for initiating the random access again according to the backoff indicator in the manner described in the method shown in fig. 2.

Through the implementation mode, the access network equipment only needs to configure one parameter value, and the timely sending of the random access with higher priority is ensured under the condition of keeping the lower complexity of the random access response message.

In another possible implementation manner, the random access response message includes a backoff indicator, and the parameter information indicates parameter values corresponding to all random access priorities. And after receiving the random access response message, the terminal equipment determines a corresponding parameter value according to the priority of the initiated random access, thereby determining the waiting time for initiating the random access again according to the parameter value and the backoff indication.

For example, if there may be 3 priorities for the terminal device to initiate random access, the parameter information configured in the random access response message by the access network device indicates 3 parameter values. And after receiving the random access response message, the terminal equipment determines 1 parameter value corresponding to the priority for initiating the random access in the 3 parameter values so as to determine the waiting time for initiating the random access again.

Alternatively, the parameter information directly indicates a value of a parameter corresponding to each random access priority. The terminal equipment can directly search the parameter value corresponding to the initiated random access priority through the parameter information.

The parameter information may also indirectly indicate a value of a parameter corresponding to each random access priority. For example, the parameter information indicates an index of a parameter value corresponding to each random access priority. The access network device sends all parameter values and an index of each parameter value to the terminal device in advance through Radio Resource Control (RRC) messages, MAC messages or broadcast messages. And the terminal equipment searches a parameter value index corresponding to the initiated random access priority through the parameter information and determines a corresponding parameter value through the index. The method can accurately indicate the parameter value under the condition of simplifying the parameter information.

Through the implementation mode, the access network equipment can indicate the parameter value corresponding to each random access priority, so that the conflict among the random accesses of all the priorities is reduced, and the ordered sending of the random accesses of all the priorities is ensured.

It can be understood that, in the foregoing implementation manner, the access network device does not recognize the priority of the random access initiated by the terminal device, but uniformly sends the possible parameter information to the terminal device. And the terminal equipment determines the use of the parameter information according to the priority of initiating random access.

Optionally, as stated in S402, the parameter value indicated by the parameter information is a correction value. And the terminal equipment determines a first correction value according to the priority of the initiated random access. And the terminal equipment determines the waiting time according to the backoff indication and the first correction value. Wherein the first time is greater than or equal to 0 and less than or equal to the wait time.

For example, for convenience of description, the time value indicated by the backoff indicator is expressed as BI₀The first correction value is expressed as delta and the waiting time is expressed as BI₁. The terminal device may associate the BI with the user₁Determined as BI₀+ delta or BI₀-delta。I.e. the terminal device may be at the BI according to the priority of the initiated random access₀Is added or subtracted to obtain the BI₁. The terminal device may also be used for BI₁Determined as BI₀Delta. In determining BI₁Then, the terminal device will be at 0 to BI₁Randomly selecting a value as the first time.

Optionally, as stated in S402, the parameter information indicates a parameter associated with a predetermined algorithm. And the terminal equipment determines a first parameter according to the initiated priority of random access. The terminal device determines the wait time according to a predetermined algorithm associated with the first parameter. Wherein the first time is equal to the wait time.

For example, the edges are represented by the symbols in the above example, and the first parameter is represented as delta. The terminal device may be distributed between 0 and BI according to a predetermined probability with delta as a variable₀Is selected as the BI₁。

Taking the binomial distribution as an example, the probability represented by the following binomial distribution is between 0 and BI₀Determine the BI₁：

Wherein k is more than or equal to 0 and less than or equal to BI₀P determines the BI for the terminal device₁The probability of (c).

It will be appreciated that the access network device configures the respective deltas for different random access priorities, and thus each random access priority has a probability distribution curve associated with the corresponding delta. The terminal equipment is arranged between 0 and BI according to the probability distribution curve₀A value is selected as the waiting time.

It should be noted that the predetermined probability distribution is not limited to a binomial distribution, and other forms of probability distributions are also applicable here.

Optionally, the parameter information indicates a probability value. The terminal device determines a first probability according to the priority of the initiated random access. The terminal device retransmits the preamble according to the first probability.

For example, the edges are represented by the symbols in the above example, and the first probability is represented as delta. Wherein, 0<delta is less than or equal to 1. The terminal equipment is at 0 to BI₀Randomly selecting a value as the waiting time, the first time being equal to the waiting time. Thereafter, the terminal device retransmits the preamble to the access network device with a probability of delta.

The access network device may configure different probabilities for different priorities of random access initiated by the terminal device. For example, for URLLC service with a strict delay requirement, the preamble may be retransmitted to the access network device with a greater probability after waiting for a period of time, so that the random access with a strict delay requirement may have a stronger contention.

It is to be understood that the terminal device retransmits the preamble according to the foregoing steps, thereby retransmitting the random access.

By the method provided by the embodiment of the invention, the terminal equipment can determine the waiting time according to the priority of the initiated random access, the backoff indication configured by the access network equipment and the parameter information, so that the random access can be initiated again according to the requirements of different random access priorities, and the requirement of low time delay is met.

Fig. 5 is a schematic diagram illustrating a random access method according to another embodiment of the present invention in an interactive manner. The method provided by the present embodiment will be described in detail below with reference to fig. 5.

S501, the terminal device sends a lead code to the access network device.

Correspondingly, the access network device receives the preamble sent by the terminal device.

Wherein the preamble indicates a priority of random access.

It is understood that the division of the random access priority is the same as that described in S403 and S404, and is not described herein again.

S502, the access network equipment determines the priority of the random access initiated by the terminal equipment according to the lead code.

S503, the access network device sends a random access response message to the terminal device.

Wherein the random access response message includes a backoff indicator indicating a time value and parameter information corresponding to the priority of the random access

It can be understood that the access network device determines the priority of the random access initiated by the terminal device by identifying the preamble sent by the terminal device. And after confirming the random access priorities indicated by all the lead codes, the access network equipment configures parameter information for the random access priorities.

Optionally, the random access response message is a MAC PDU.

S504, the terminal device determines waiting time according to the back-off indication and the parameter information.

It can be understood that the terminal device determines a corresponding parameter value according to the priority of initiating random access, and determines the waiting time according to the back-off indication and the parameter value.

Optionally, the parameter information indicates a correction value or a parameter associated with a predetermined algorithm. The specific use method of the parameter information is the same as that described in S403 and S403 in the method shown in fig. 4, and is not described in detail here.

Through the method provided by the embodiment of the invention, the access network equipment can configure the corresponding parameter information according to the priority of random access initiated by the terminal equipment, and the terminal equipment is ensured to reinitiate the random access according to the requirements of different random access priorities while simplifying the indication of the parameter information, thereby meeting the requirement of low time delay.

Fig. 6 is a schematic diagram illustrating a random access method according to another embodiment of the present invention in an interactive manner. The method provided by the present embodiment will be described in detail below with reference to fig. 6.

S601, the terminal equipment sends a lead code to the access network equipment.

Accordingly, the access network device receives the preamble.

Wherein the preamble indicates a priority of random access. The division of the random access priority is the same as that described in S403 and S404, and is not described herein again.

Optionally, each random access priority has a corresponding preamble set. And the terminal equipment determines a corresponding first preamble set according to the priority of the initiated random access. The terminal device selects the preamble in the first set of preambles.

Optionally, the terminal device may further determine a downlink beam for receiving the random access response message, and determine an SS block according to an index (index) of a Secondary Synchronization block (SS block) that identifies the downlink beam. The terminal device may select an SS block corresponding to a downlink beam with a best measurement result. And the terminal equipment determines a corresponding lead code set according to the SS block. The terminal device determines the first preamble set in the preamble set according to the priority of the initiated random access.

S602, the access network equipment determines the priority of the random access initiated by the terminal equipment according to the lead code.

S603, the access network equipment sends a random access response message to the terminal equipment.

Wherein the random access response message includes a backoff indicator indicating a time value, and the backoff indicator corresponds to a priority of the random access.

It can be understood that the access network device determines the priority of the random access initiated by the terminal device by identifying the preamble sent by the terminal device. And after confirming the random access priorities indicated by all the lead codes, the access network equipment configures backoff instructions corresponding to the random access priorities.

Optionally, the random access response message is a MAC PDU. Taking a MAC PDU containing 2 backoff indicators as an example, fig. 7 shows a schematic structural diagram thereof. Similar to the MAC PDU shown in fig. 3, the MAC PDU in fig. 7 also includes a plurality of MAC subheaders and MAC CEs corresponding to the MAC subheaders. The access network equipment determines that the random access priority indicated by the lead code is 2 according to the lead code sent by the terminal equipment. Therefore, the access network device configures a corresponding backoff indicator for each random access priority, that is, the MAC subheader includes 2 MAC subheaders with BI fields.

Fig. 8 is a structural diagram of the MAC subheader with the BI field. Wherein, the MAC subheader with the BI subsegment includes E, R, R, T, BI fields, and each field has the following meaning:

the-E field is an extension field for indicating whether or not there are further fields of the MAC subheader following it.

For example, setting the E field to 1 indicates that at least one more E/T/RAPID field exists later. Setting the E field to 0 indicates that there are no other MAC subheader fields following, and starting with the next byte, it is the MAC RAR.

the-T field is used to indicate the type of MAC subheader.

For example, if the T field is set to 0, it indicates that the subheader in which the T field is located contains the BI field. And setting the T field to 1, indicating that the subheader where the T field is located contains a RAPID field.

the-R field is a reserved bit set to 0.

The BI field is used to indicate a backoff indication corresponding to the random access priority.

Optionally, the R field is used to indicate a priority of random access. For example, if the R field is 2 bits, it can be used to indicate 4 random access priorities.

The T field and the R field may be used in combination to indicate a priority of random access. For example, if the T field and the R field have 3 bits, the type of the MAC subheader may be indicated by 000, and the 6 random access priorities may be indicated by 001, 010, 011, 100, 101, 110, 111.

S604, the terminal equipment determines the waiting time according to the initiated random access priority and the backoff instruction.

And the terminal equipment searches the corresponding back-off indication in the random access response message according to the priority of the initiated random access. The terminal device may randomly select one value among 0 and the time value indicated by the corresponding backoff indicator as the waiting time.

By the method provided by the embodiment of the invention, the access network equipment can configure the corresponding backoff indication according to the priority of the random access initiated by the terminal equipment, so that the terminal equipment can reinitiate the random access according to the requirements of different random access priorities, thereby meeting the requirement of low time delay.

Fig. 9 is a schematic diagram illustrating a random access method according to still another embodiment of the present invention in an interactive manner. The method provided by the present embodiment will be described in detail below with reference to fig. 7.

S901, the terminal device sends a first preamble to the access network device.

S902, the access network device sends a random access response message to the terminal device.

Wherein the random access response message contains at least two backoff indicators. The backoff indicator indicates a time value. For example, the random access response message contains backoff indications corresponding to all random access priorities.

And S903, the terminal equipment determines the waiting time according to the back-off indication.

Wherein the waiting time is one of time values indicated by the at least two backoff indicators.

S904, the terminal device sends a second preamble to the access network device after delaying the first time.

Wherein the first time is less than or equal to the wait time, and the second preamble is the same as or different from the first preamble.

It can be understood that the terminal device determines the corresponding back-off indication according to the initiated priority of the random access, that is, the waiting time. And the terminal equipment randomly selects a value as the first time within 0 and the waiting time.

The other parts of S903 and S904 are the same as S403 and S404 shown in fig. 4, and are not described in detail here.

By the method provided by the embodiment of the invention, the access network equipment can configure backoff instructions corresponding to all random access priorities for the terminal equipment, and the terminal equipment can determine the corresponding backoff instructions according to the requirements of different random access priorities and reinitiate random access, thereby meeting the requirement of low time delay.

Fig. 10 is a schematic diagram illustrating a random access method according to still another embodiment of the present invention in an interactive manner. The method provided by the present embodiment will be described in detail below with reference to fig. 10.

And S1001, the terminal equipment sends a lead code to the access network equipment through the first PRACH.

Wherein the first PRACH indicates a priority of the random access.

Optionally, the terminal device determines a first PRACH according to the initiated priority of the random access, and sends the preamble through the first PRACH. It is understood that different random access priorities correspond to different PRACH.

Optionally, the terminal device may further determine a downlink beam for receiving the random access response message and determine an SS block according to an SS block index (index) identifying the downlink beam. The terminal device may select an SS block corresponding to a downlink beam with a best measurement result. And the terminal equipment determines a corresponding PRACH according to the SS block. And the terminal equipment determines the first PRACH in the PRACH according to the priority of the initiated random access.

S1002, the access network equipment determines the priority of random access initiated by the terminal equipment according to the first PRACH.

S1003, the access network equipment sends a random access response message to the terminal equipment.

The random access response message comprises a backoff indication, the backoff indication indicates a time value, and the backoff indication corresponds to the priority of random access initiated by the terminal equipment.

Optionally, the first random access response message is a MAC PDU.

It can be appreciated that the access network device multiplexes RARs for preambles transmitted over the same PRACH into the same MAC PDU as described at S203. Therefore, when the terminal device sends the preambles with the same random access priority on the same PRACH, the access network device multiplexes the RARs corresponding to the preambles with the same random access priority in the same MAC PDU, so that the terminal device can receive different MAC PDUs according to the requirements of different random access priorities, thereby meeting the requirement of low delay.

Fig. 11 is a schematic diagram illustrating a random access method according to still another embodiment of the present invention in an interactive manner. The method provided by the present embodiment will be described in detail below with reference to fig. 11.

S1101, the access network equipment sends configuration information to the terminal equipment.

Correspondingly, the terminal device receives the configuration information sent by the access network device.

Wherein the configuration information includes random access priority information and random access configuration information. Each random access priority corresponds to a group of random access configurations, and the random access configurations corresponding to different random access priorities are different.

The random access priority is divided in the same manner as in the previous embodiment, and detailed description thereof is omitted.

Optionally, the random access configuration includes at least one of the following configurations:

Preamble maximum transmission times preambleTransMax

Preamble initial transmit power preambilnitial receivedtargetpower

Power step up step powerRampingStep

-random access response window ra-ResponsewindowSize

HARQ maximum retransmission times maxHARQ-Msg3 of-Msg 3

Contention resolution timer mac ContentionResolutionTimer.

It can be understood that the access network device configures different random access configurations for each random access priority, so that the terminal devices do not compete with each other when initiating random access with different random access priorities. For example, for random access of URLLC service, the access network device may preferentially configure corresponding parameters and resources.

S1102, the terminal equipment determines corresponding random access configuration according to the priority of the initiated random access.

S1103, the terminal device initiates a random access to the access network device through the corresponding random access configuration.

When the access network equipment receives random accesses with different random access priorities, random access competition among the terminal equipment cannot occur because the random accesses are initiated through different random access configurations.

When the access network device receives random accesses with the same random access priority, the access network device may use the method shown in the foregoing embodiment to solve the contention problem between the random accesses.

The random access method provided by the embodiment of the present invention is introduced mainly from the interaction perspective between network elements. It is to be understood that each network element, such as the terminal device, the access network device, etc., contains corresponding hardware structures and/or software modules for performing each function in order to realize the functions. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

Fig. 12 shows a schematic diagram of a possible structure of the terminal device involved in the above embodiment. It should be noted that the terminal device is capable of executing the method in the foregoing embodiment, and therefore, specific details thereof may refer to the description in the foregoing embodiment, and for the sake of brevity, the same contents are not described in detail below. The terminal device may be a

terminal device

20, 30 as shown in fig. 1. The terminal device includes a transceiving unit 1201 and a processing unit 1202.

The terminal device may perform the method in the embodiment shown in fig. 4. Wherein:

the transceiving unit 1201 is configured to send a first preamble to an access network device.

The transceiving unit 1201 is further configured to receive a random access response message sent by the access network device.

The random access response message comprises a backoff indication and parameter information, wherein the backoff indication indicates a time value, and the parameter information is used for the terminal equipment to determine the waiting time;

the processing unit 1202 is configured to determine the waiting time according to the backoff indicator or according to the backoff indicator and the parameter information.

The transceiving unit 1201 is further configured to send a second preamble to the access network device after delaying the first time.

The processing unit 1202 is further configured to determine the waiting time according to the priority of the initiated random access, the parameter information, and the backoff indicator. Wherein the parameter information indicates a correction value or a parameter associated with a predetermined algorithm, and the first time is greater than or equal to 0 and less than or equal to the waiting time.

When the parameter information indicates at least two modification values, the processing unit 1202 is further configured to determine a first modification value according to a priority of the initiated random access, where the first modification value is one of the at least two modification values. The processing unit 1202 is further configured to determine the waiting time according to the backoff indicator and the first correction value. Wherein the first time is greater than or equal to 0 and less than or equal to the wait time.

The processing unit 1202 is further configured to determine a first parameter according to a priority of the initiated random access when the parameter information indicates at least two parameters associated with a predetermined algorithm, the first parameter being one of the at least two parameters. The processing unit 1202 is further configured to determine the wait time according to a predetermined algorithm associated with the first parameter. Wherein the first time is equal to the wait time.

The processing unit 1202 is further configured to determine not to use the modification value or a parameter associated with a predetermined algorithm according to a priority of the initiated random access. Wherein the waiting time is equal to the indication time value, and the first time is greater than or equal to 0 and less than or equal to the waiting time.

The processing unit 1202 may also be configured to select a preamble, determine a priority for random access, decode the random access response message, and the like as described in the embodiment of fig. 4.

Other realizable functions not described in the above units are the same as the related functions involved in the random access method as shown in fig. 4, and are not described in detail here. Through the cooperative cooperation among the units, the terminal device can determine the waiting time according to the priority of the initiated random access, the backoff indication configured by the access network device and the parameter information, so that the random access can be restarted according to the requirements of different random access priorities, and the requirement of low time delay is met.

The terminal device may also perform the method in the embodiment shown in fig. 5. Wherein:

the transceiving unit 1201 is configured to send a preamble to the access network device.

Wherein the preamble indicates a priority of random access.

The random access response message comprises a backoff indication and parameter information, the backoff indication indicates a time value, and the parameter information corresponds to the priority of the random access.

The processing unit 1202 is configured to determine a waiting time according to the backoff indicator and the parameter information.

When the parameter information indicates a modification value, the processing unit 1202 is further configured to determine a first modification value according to a priority of the initiated random access. The processing unit 1202 is further configured to determine the waiting time according to the backoff indicator and the first correction value.

The processing unit 1202 is further configured to determine the first parameter according to a priority of the initiated random access when the parameter information indicates a parameter associated with a predetermined algorithm. The processing unit 1202 determines the wait time according to a predetermined algorithm associated with the first parameter.

The processing unit 1202 may also be configured to select a preamble, determine a priority for random access, decode the random access response message, and the like as described in the embodiment of fig. 5.

Other realizable functions not described in the above units are the same as the related functions involved in the random access method as shown in fig. 5, and are not described in detail here. Through the cooperative coordination among the units, the terminal equipment can receive the parameter information corresponding to the random access priority configuration initiated by the access network equipment according to the terminal equipment, and the terminal equipment is ensured to reinitiate the random access according to the requirements of different random access priorities while simplifying the indication of the parameter information, so that the requirement of low time delay is met.

The terminal device may also perform the method in the embodiment shown in fig. 6. Wherein:

Wherein the preamble indicates a priority of random access.

The processing unit 1202 is configured to determine a waiting time according to the priority of the initiated random access and the backoff indicator.

The processing unit 1202 is further configured to determine the first preamble set according to a priority of the initiated random access. The processing unit 1202 selects the preamble in the first set of preambles.

The processing unit 1202 is further configured to determine a downlink beam for receiving the random access response message and determine an auxiliary synchronization block according to the auxiliary synchronization block information identifying the downlink beam. The processing unit 1202 determines a corresponding preamble set according to the secondary synchronization block. The processing unit 1202 determines the first set of preambles in the set of preambles in accordance with a priority of the initiated random access.

The processing unit 1202 may also be configured to select a preamble, determine a priority of random access, decode the random access response message, and the like as described in the embodiment of fig. 6.

Other realizable functions not described in the above units are the same as the related functions involved in the random access method as shown in fig. 6, and are not described in detail here. Through the cooperative coordination among the units, the terminal equipment can receive the backoff indication corresponding to the random access priority configuration initiated by the access network equipment according to the terminal equipment, so that the terminal equipment can reinitiate the random access according to the requirements of different random access priorities, and the requirement of low time delay is met.

The terminal device may also perform the method in the embodiment shown in fig. 9. Wherein:

Wherein the random access response message comprises at least two backoff indicators, the backoff indicators indicating a time value.

The processing unit 1202 is configured to determine a waiting time according to the backoff indicator.

The transceiving unit 1201 is further configured to send a second preamble to the access network device after delaying the first time. Wherein the first time is less than or equal to the wait time, and the second preamble is the same as or different from the first preamble.

The processing unit 1202 may also be configured to select a preamble, determine a priority of random access, decode the random access response message, and the like as described in the embodiment of fig. 9.

Other realizable functions not described in the above units are the same as the related functions involved in the random access method as shown in fig. 9, and are not described in detail here. Through the cooperative coordination among the units, the terminal device can receive backoff instructions corresponding to all random access priorities configured for the terminal device by the access network device, and the terminal device can determine the corresponding backoff instructions according to the requirements of different random access priorities and reinitiate random access, thereby meeting the requirement of low time delay.

The terminal device may also perform the method in the embodiment shown in fig. 10. Wherein:

the transceiving unit 1201 is configured to send a preamble to the access network device through the first PRACH.

The processing unit 1202 is configured to select the first PRACH, select the preamble, determine a priority of random access, decode the random access response message, and the like as described in the embodiment of fig. 10.

Other realizable functions not described in the above units are the same as the related functions involved in the random access method as shown in fig. 10, and are not described in detail here. Through the cooperative cooperation among the units, the terminal equipment can receive different random access response messages according to the requirements of different random access priorities, so that the requirement of low time delay is met.

The terminal device may also perform the method in the embodiment shown in fig. 11. Wherein:

the transceiving unit 1201 is configured to receive configuration information sent by an access network device.

The processing unit 1202 is configured to determine a corresponding random access configuration according to a priority of the initiated random access.

The transceiving unit 1201 is further configured to initiate a random access to the access network device through the corresponding random access configuration.

Other realizable functions not described in the above units are the same as the related functions involved in the random access method as shown in fig. 11, and are not described in detail here. Through the cooperative cooperation among the units, the terminal equipment can use different random access configurations according to the requirements of different random access priorities, so that the problem of competition is solved, and the requirement of low time delay is met.

Fig. 13 shows a schematic diagram of a possible structure of the terminal device involved in the above embodiment. The terminal device includes a processor 1302 and a transceiver 1301. The processing unit 1202 depicted in fig. 12 may be implemented by the processor 1302, and the transceiving unit 1201 may be implemented by the transceiver 1301, where the transceiver 1301 may be configured to support transceiving data between a terminal device and an access network device in the foregoing embodiments. The terminal device may also include a memory 1303, which may be used to store program codes and data for the terminal device. The various components in the terminal device are coupled together to support the functions of the terminal device in the random access method as described in fig. 4-11.

It will be appreciated that fig. 13 only shows a simplified design of the terminal device. In practical applications, the terminal device may include any number of transceivers, processors, memories, etc., and all terminal devices that can implement the embodiments of the present invention are within the protection scope of the present invention.

Fig. 14 shows a schematic diagram of a possible structure of the access network device involved in the above embodiments. It should be noted that the access network device is capable of executing the method in the foregoing embodiment, and therefore, specific details thereof may refer to the description in the foregoing embodiment, and for the sake of brevity, the same contents are not described in detail below. The access network device may be the access network device 10 as shown in fig. 1. The access network device comprises a transceiving unit 1401 and a processing unit 1402.

The access network device may perform the method in the embodiment shown in fig. 4. Wherein:

the transceiving unit 1401 is configured to receive a first preamble transmitted by a terminal device.

The processing unit 1402 is configured to determine a random access response message.

The random access response message comprises a backoff indicator and at least one parameter message, wherein the backoff indicator indicates a time value, and the at least one parameter message is used for the terminal equipment to determine the waiting time.

The transceiver unit 1401 is further configured to send the random access response message to the terminal device.

The transceiving unit 1401 is further configured to receive a second preamble transmitted by the terminal device after delaying the first time.

The processing unit 1402 may also be configured to configure various parameters of the random access response message, and the like, as described in the embodiment of fig. 4.

Other realizable functions not described in the above units are the same as the related functions involved in the random access method as shown in fig. 4, and are not described in detail here. Through the cooperative coordination among the units, the access network equipment can configure parameter information for the terminal equipment, so that the terminal equipment can determine the waiting time according to the priority of the initiated random access, the backoff indication and the parameter information, and can reinitiate the random access according to the requirements of different random access priorities, thereby meeting the requirement of low time delay.

The access network device may perform the method in the embodiment shown in fig. 5. Wherein:

the transceiving unit 1401 is configured to receive a preamble transmitted by a terminal device.

Wherein the preamble indicates a priority of random access.

The processing unit 1402 may also be configured to determine a priority of random access, configure various parameters of the random access response message, and the like, as described in the embodiment of fig. 5.

Other realizable functions not described in the above units are the same as the related functions involved in the random access method as shown in fig. 5, and are not described in detail here. Through the cooperative coordination among the units, the access network equipment can configure corresponding parameter information according to the priority of random access initiated by the terminal equipment, and the terminal equipment is ensured to reinitiate the random access according to the requirements of different random access priorities while simplifying the indication of the parameter information, so that the requirement of low time delay is met.

The access network device may perform the method in the embodiment shown in fig. 6. Wherein:

Wherein the preamble indicates a priority of random access.

The processing unit 1402 is configured to determine a priority of random access initiated by the terminal device according to the preamble.

The transceiver unit 1401 is further configured to send a random access response message to the terminal device, where the random access response message includes a backoff indicator, the backoff indicator indicates a time value, and the backoff indicator corresponds to a priority of the random access.

The processing unit 1402 may also be configured to configure various parameters of the random access response message, and the like, as described in the embodiment of fig. 6.

Other realizable functions not described in the above units are the same as the related functions involved in the random access method as shown in fig. 6, and are not described in detail here. Through the cooperative coordination among the units, the access network equipment can configure the corresponding backoff indication according to the priority of random access initiated by the terminal equipment, so that the terminal equipment can reinitiate random access according to the requirements of different random access priorities, thereby meeting the requirement of low time delay.

The access network device may perform the method in the embodiment shown in fig. 9. Wherein:

The random access response message comprises at least two backoff indications, the backoff indications indicate time values, the backoff indications are used for the terminal equipment to determine waiting time, and the waiting time is one of the time values indicated by the at least two backoff indications.

The processing unit 1402 may also be configured to configure various parameters of the random access response message, and the like, as described in the embodiment of fig. 9.

Other realizable functions not described in the above units are the same as the related functions involved in the random access method as shown in fig. 9, and are not described in detail here. Through the cooperative coordination among the units, the access network equipment can configure backoff instructions corresponding to all random access priorities for the terminal equipment, and the terminal equipment can determine the corresponding backoff instructions according to the requirements of different random access priorities and reinitiate random access, thereby meeting the requirement of low time delay.

The access network device may perform the method in the embodiment shown in fig. 10. Wherein:

the transceiver unit 1401 is configured to receive a preamble transmitted by a terminal device through a first PRACH.

The processing unit 1402 is configured to determine a priority of random access initiated by the terminal device according to the first PRACH.

The transceiving unit 1401 is further configured to send a random access response message to the terminal device.

The processing unit 1402 may also be configured to configure various parameters of the random access response message, and the like, as described in the embodiment of fig. 10.

Other realizable functions not described in the above units are the same as the related functions involved in the random access method as shown in fig. 10, and are not described in detail here. Through the cooperative coordination among the units, the access network equipment multiplexes the RARs corresponding to the preambles of the same random access priority into the same random access response message, so that the terminal equipment can receive different random access response messages according to the requirements of different random access priorities, thereby meeting the requirement of low delay.

The access network device may perform the method in the embodiment shown in fig. 11. Wherein:

the transceiver unit 1401 is configured to send configuration information to a terminal device.

The transceiver unit 1401 is further configured to receive a random access sent by the terminal device through a random access configuration corresponding to the initiated random access.

The processing unit 1402 may also be configured to configure various parameters of the random access configuration, and the like, as described in the embodiment of fig. 11.

Other realizable functions not described in the above units are the same as the related functions involved in the random access method as shown in fig. 11, and are not described in detail here. Through the cooperative coordination among the units, the access network equipment configures different parameters for random access with different random access priorities, so that the problem of competition among the different random access priorities is solved, and the requirement of low time delay is met.

Fig. 15 shows a schematic diagram of a possible structure of the access network device involved in the above embodiments. The access network device includes a processor 1502 and a transceiver 1501. The processing unit 1402 depicted in fig. 14 may be implemented by the processor 1502, and the transceiving unit 1401 may be implemented by the transceiver 1501, which may be configured to support transceiving data between the access network device and the terminal device in the above embodiments. The access network device may also include a memory 1503 that may be used to store program codes and data for the terminal device. The various components of the access network equipment are coupled together to support the functions of the access network equipment in the random access method involved in the embodiments described in fig. 4-11.

It will be appreciated that fig. 15 only shows a simplified design of the access network equipment. In practical applications, the access network device may include any number of transceivers, processors, memories, etc., and all access network devices that can implement the embodiments of the present invention are within the protection scope of the present invention.

It is understood that the processor in embodiments of the invention may be a Central Processing Unit (CPU), a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processing unit, or in a combination of the two. A software module may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. For example, a storage medium may be coupled to the processing unit such that the processing unit can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processing unit. The processing unit and the storage medium may be configured in an ASIC, which may be configured in a user terminal device. Alternatively, the processing unit and the storage medium may be disposed in different components in the user terminal device.

Those skilled in the art will recognize that the functionality described in connection with the embodiments of the invention may be implemented in hardware, software, firmware, or any combination of the three in one or more of the examples described above. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media that facilitate transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. For example, such computer-readable media can include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to carry or store program code in the form of instructions or data structures and other forms readable by a general/special computer or a general/special processing unit. Further, any connection is properly termed a computer-readable medium, and thus is included, for example, if software is transmitted from a website, server, or other remote source over a coaxial cable, fiber optic computer, twisted pair, Digital Subscriber Line (DSL), or wirelessly, e.g., infrared, radio, and microwave. Such discs (disk) and disks (disc) include compact disks, laser disks, optical disks, DVDs, floppy disks and blu-ray disks where disks usually reproduce data magnetically, while disks usually reproduce data optically with lasers. Combinations of the above may also be included in the computer-readable medium.

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.

Claims

1. A random access method, comprising:

the terminal equipment sends a first lead code to the access network equipment;

the terminal equipment receives a random access response message sent by the access network equipment, wherein the random access response message comprises a backoff indication and parameter information, the backoff indication indicates a time value, and the parameter information is used for the terminal equipment to determine waiting time;

the parameter information indicates a correction value or a parameter associated with a predetermined algorithm;

the terminal device determines the waiting time according to the back-off indication and the parameter information, and the method comprises the following steps: the terminal equipment determines the waiting time according to the initiated random access priority, the parameter information and the backoff indication, wherein the parameter information corresponds to the random access priority;

and the terminal equipment transmits a second preamble to the access network equipment after delaying a first time, wherein the first time is greater than or equal to 0 and less than or equal to the waiting time, and the second preamble and the first preamble are the same or different.

2. The method of claim 1, wherein the parameter information indicates at least two correction values;

the terminal device determines the waiting time according to the back-off indication and the parameter information, and the method comprises the following steps:

the terminal equipment determines a first correction value according to the priority of the initiated random access, wherein the first correction value is one of the at least two correction values;

and the terminal equipment determines the waiting time according to the backoff indication and the first correction value, wherein the first time is greater than or equal to 0 and less than or equal to the waiting time.

3. The method of claim 1, wherein the parameter information indicates at least two parameters associated with a predetermined algorithm;

the terminal equipment determines a first parameter according to the priority of the initiated random access, wherein the first parameter is one of the at least two parameters;

the terminal device determines the wait time according to a predetermined algorithm associated with the first parameter, wherein the first time is equal to the wait time.

4. A random access method, comprising:

the method comprises the steps that terminal equipment sends a lead code to access network equipment, wherein the lead code indicates the priority of random access;

the terminal equipment receives a random access response message sent by the access network equipment, wherein the random access response message comprises a backoff indication and parameter information, the backoff indication indicates a time value, and the parameter information corresponds to the priority of the random access;

the parameter information indicates a correction value, or indicates a parameter associated with a predetermined algorithm;

the terminal equipment determines the waiting time according to the back-off indication and the parameter information, and the method comprises the following steps: the terminal equipment determines a first correction value according to the priority of initiated random access, the first correction value is one of at least two correction values, and the terminal equipment determines the waiting time according to the backoff indication and the first correction value; or the like, or, alternatively,

the terminal device determining the waiting time according to the backoff instruction and the parameter information comprises: the terminal device determines a first parameter according to the priority of the initiated random access, and the terminal device determines the waiting time according to a predetermined algorithm associated with the first parameter.

5. The method of claim 4, wherein prior to the terminal device transmitting the preamble to the access network device, further comprising:

the terminal equipment determines a first lead code set according to the priority of the initiated random access;

the terminal device selects the preamble in the first set of preambles.

6. The method of claim 5, wherein the terminal device determining the first set of preambles based on a priority of the initiated random access comprises:

the terminal equipment determines to receive the downlink wave beam of the random access response message and determines an auxiliary synchronous block according to auxiliary synchronous block information which identifies the downlink wave beam;

the terminal equipment determines a corresponding lead code set according to the auxiliary synchronization block;

the terminal device determines the first preamble set in the preamble set according to the priority of the initiated random access.

7. A random access method, comprising:

the method comprises the steps that access network equipment receives a lead code sent by terminal equipment, wherein the lead code indicates the priority of random access;

the access network equipment determines the priority of random access initiated by the terminal equipment according to the lead code;

the access network equipment sends a random access response message to the terminal equipment, wherein the random access response message comprises a backoff indication and parameter information, the backoff indication indicates a time value, and the parameter information corresponds to the priority of the random access;

the parameter information indicates a correction value or a parameter associated with a predetermined algorithm.

8. A terminal device, comprising:

a transceiving unit, configured to send a first preamble to an access network device;

the transceiver unit is further configured to receive a random access response message sent by the access network device, where the random access response message includes a backoff indicator and parameter information, the backoff indicator indicates a time value, and the parameter information is used by the terminal device to determine a waiting time;

a processing unit, configured to determine the waiting time according to the backoff indicator and the parameter information, including: the processing unit determines the waiting time according to the priority of the initiated random access, the parameter information and the backoff instruction, wherein the parameter information corresponds to the priority of the random access, and the parameter information indicates a correction value or a parameter associated with a predetermined algorithm;

the transceiver unit is further configured to transmit a second preamble to the access network device after delaying a first time, where the first time is greater than or equal to 0 and less than or equal to the waiting time, and the second preamble and the first preamble are the same or different.

9. The terminal device according to claim 8, wherein the parameter information indicates at least two correction values;

the processing unit is configured to determine the waiting time according to the backoff indicator and the parameter information, and includes:

the processing unit determines a first correction value according to the priority of the initiated random access, wherein the first correction value is one of the at least two correction values;

the processing unit determines the waiting time according to the back-off indication and the first correction value, wherein the first time is greater than or equal to 0 and less than or equal to the waiting time.

10. The terminal device of claim 8, wherein the parameter information indicates at least two parameters associated with a predetermined algorithm;

the processing unit determines a first parameter according to the priority of the initiated random access, wherein the first parameter is one of the at least two parameters;

the processing unit determines the wait time according to a predetermined algorithm associated with the first parameter, wherein the first time is equal to the wait time.

11. A terminal device, comprising:

a transceiving unit, configured to send a preamble to an access network device, where the preamble indicates a priority of random access;

the transceiver unit is further configured to receive a random access response message sent by the access network device, where the random access response message includes a backoff indicator and parameter information, the backoff indicator indicates a time value, and the parameter information corresponds to a priority of the random access;

a processing unit, configured to determine a waiting time according to the backoff indicator and the parameter information, including: the terminal equipment determines a first correction value according to the priority of initiated random access, the first correction value is one of at least two correction values, and the terminal equipment determines the waiting time according to the backoff indication and the first correction value; or the like, or, alternatively,

12. The terminal device of claim 11, wherein before the transceiver unit transmits the preamble to the access network device, further comprising:

the processing unit determines a first lead code set according to the priority of the initiated random access;

the processing unit selects the preamble in the first set of preambles.

13. The terminal device of claim 12, wherein the processing unit to determine the first set of preambles based on a priority of the initiated random access comprises:

the processing unit determines a downlink beam for receiving the random access response message and determines an auxiliary synchronization block according to auxiliary synchronization block information for identifying the downlink beam;

the processing unit determines a corresponding lead code set according to the auxiliary synchronization block;

the processing unit determines the first preamble set among the preamble sets according to a priority of the initiated random access.

14. An access network device, comprising:

the terminal equipment comprises a transceiving unit, a judging unit and a judging unit, wherein the transceiving unit is used for receiving a lead code sent by the terminal equipment, and the lead code indicates the priority of random access;

a processing unit, configured to determine a random access response message, where the random access response message includes a backoff indicator and parameter information, the backoff indicator indicates a time value, and the parameter information corresponds to a priority of the random access;

the transceiver unit is further configured to send the random access response message to the terminal device.

15. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method of any of claims 1-7.