WO2023065244A1

WO2023065244A1 - Random access method, terminal device, and network device

Info

Publication number: WO2023065244A1
Application number: PCT/CN2021/125411
Authority: WO
Inventors: 付喆; 林雪
Original assignee: Oppo广东移动通信有限公司
Priority date: 2021-10-21
Filing date: 2021-10-21
Publication date: 2023-04-27
Also published as: CN117730614A

Abstract

The present application relates to a random access method, a terminal device, a network device, a chip, a computer readable storage medium, a computer program product, a computer program, and a communication system. The method comprises: a terminal device determines, on the basis of first information sent from a network device, whether to perform fallback from a first random access procedure to a second random access procedure, the first information being used to indicate whether to support or perform the fallback from the first random access procedure to the second random access procedure, or to indicate whether to support or perform the fallback from the first random access procedure to a third random access procedure. The fallback of a random access procedure can be correctly achieved according to embodiments of the present application.

Description

Random access method, terminal equipment and network equipment

technical field

The present application relates to the communication field, and more specifically, to a random access method, terminal equipment, network equipment, chip, computer-readable storage medium, computer program product, computer program and communication system.

Background technique

The strong demand for wireless communication in vertical industries is obvious to all. In order to meet the requirements of vertical industries for delay, mobility, reliability, and location accuracy, the radio access network (Radio Access Network, RAN) needs to understand how to communicate in the access network. Support vertical business for enhancement. Among them, one way is to provide lower latency, more targeted, greater flexibility and higher scalability services for multiple services with different requirements based on network slicing. More specifically, the introduction of network slicing allows application providers to participate in the design, deployment, and operation of customized RANs to better support application providers' businesses. Further, the access network can be introduced to enhance slices, such as random access channel (Random Access Channel, RACH) configuration for slices. How to implement switching or fallback between different RACHs is a problem to be solved.

Contents of the invention

In view of this, embodiments of the present application provide a random access method, terminal device, network device, chip, computer-readable storage medium, computer program product, computer program, and communication system, which can be used for rollback of the random access process.

The embodiment of this application provides a random access method, including:

The terminal device determines whether to perform a fallback from the first random access procedure to the second random access procedure based on the first information sent by the network device;

Wherein, the first information is used to indicate whether to support or perform a fallback from the first random access procedure to the second random access procedure, or to indicate whether to support or perform a fallback from the first random access procedure to the third random access procedure. The fallback of the access process.

The embodiment of this application provides a random access method, including:

The network device sends the first information to the terminal device, so that the terminal device determines whether to perform a fallback from the first random access procedure to the second random access procedure based on the first information;

The embodiment of the present application also provides a terminal device, including:

A first processing module, configured to determine whether to perform a fallback from the first random access procedure to the second random access procedure based on the first information sent by the network device;

The embodiment of the present application also provides a network device, including:

The first communication module is configured to send first information to the terminal device, so that the terminal device determines whether to perform a fallback from the first random access procedure to the second random access procedure based on the first information;

An embodiment of the present application also provides a terminal device, including: a processor and a memory, the memory is used to store a computer program, and the processor invokes and runs the computer program stored in the memory to execute the random access method of any embodiment of the present application.

An embodiment of the present application also provides a network device, including: a processor and a memory, the memory is used to store a computer program, and the processor invokes and runs the computer program stored in the memory to execute the random access method of any embodiment of the present application.

An embodiment of the present application further provides a chip, including: a processor, configured to invoke and run a computer program from a memory, so that a device equipped with the chip executes the random access method of any embodiment of the present application.

An embodiment of the present application further provides a computer-readable storage medium for storing a computer program, where the computer program causes a computer to execute the random access method of any embodiment of the present application.

An embodiment of the present application further provides a computer program product, including computer program instructions, where the computer program instructions cause a computer to execute the random access method of any embodiment of the present application.

An embodiment of the present application further provides a computer program, which enables a computer to execute the random access method of any embodiment of the present application.

An embodiment of the present application further provides a communication system, including a terminal device and a network device for performing the random access method in any embodiment of the present application.

According to the technical solution of the embodiment of this application, whether the terminal device performs rollback from the first random access procedure to the second random access procedure is based on whether the network device supports or instructs the terminal device to perform the fallback to the second random access procedure. The fallback is determined, or is executed based on whether the network device supports or instructs the terminal device to perform fallback to other random access procedures. In this way, the terminal device can correctly implement the rollback of the random access procedure.

Description of drawings

FIG. 1 is a schematic diagram of a communication system architecture according to an embodiment of the present application.

Fig. 2A is a schematic flow chart of four-step random access according to the embodiment of the present application.

FIG. 2B is a schematic flow diagram of two-step random access according to the embodiment of the present application.

Fig. 3 is a schematic flow chart of MsgB-based fallback in two-step random access according to an embodiment of the present application.

Fig. 4 is a schematic flowchart of a random access method according to an embodiment of the present application.

Fig. 5 is a schematic flowchart of a random access method according to another embodiment of the present application.

FIG. 6 is an interaction diagram of application example 1 of the random access method according to the embodiment of the present application;

FIG. 7 is an interaction diagram of application example 2 of the random access method according to the embodiment of the present application;

Fig. 8 is a schematic structural block diagram of a terminal device according to an embodiment of the present application.

Fig. 9 is a schematic structural block diagram of a network device according to another embodiment of the present application.

Fig. 10 is a schematic block diagram of a communication device according to an embodiment of the present application.

Fig. 11 is a schematic block diagram of a chip according to an embodiment of the present application.

Fig. 12 is a schematic block diagram of a communication system according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

The technical solution of the embodiment of the present application can be applied to various communication systems, such as: Global System of Mobile communication (Global System of Mobile communication, GSM) system, code division multiple access (Code Division Multiple Access, CDMA) system, broadband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced long term evolution (LTE-A) system , New Radio (NR) system, evolution system of NR system, LTE (LTE-based access to unlicensed spectrum, LTE-U) system on unlicensed spectrum, NR (NR-based access to unlicensed spectrum) on unlicensed spectrum unlicensed spectrum (NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunications System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (Wireless Fidelity, WiFi), fifth-generation communication (5th-Generation, 5G) system or other communication systems, etc.

Generally speaking, the number of connections supported by traditional communication systems is limited and easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communication, but also support, for example, Device to Device (Device to Device, D2D) communication, Machine to Machine (M2M) communication, Machine Type Communication (MTC), Vehicle to Vehicle (V2V) communication, or Vehicle to everything (V2X) communication, etc. , the embodiments of the present application may also be applied to these communication systems.

Optionally, the communication system in the embodiment of the present application may be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, may also be applied to a dual connectivity (Dual Connectivity, DC) scenario, and may also be applied to an independent (Standalone, SA) deployment Web scene.

The embodiments of the present application describe various embodiments in conjunction with network equipment and terminal equipment, wherein the terminal equipment may also be referred to as user equipment (User Equipment, UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.

The terminal device can be a station (STAION, ST) in the WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital processing (Personal Digital Assistant, PDA) devices, handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, next-generation communication systems such as terminal devices in NR networks, or future Terminal equipment in the evolved public land mobile network (Public Land Mobile Network, PLMN) network, etc.

In the embodiment of this application, the terminal device can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water (such as ships, etc.); it can also be deployed in the air (such as aircraft, balloons and satellites) superior).

In this embodiment of the application, the terminal device may be a mobile phone (Mobile Phone), a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (Virtual Reality, VR) terminal device, an augmented reality (Augmented Reality, AR) terminal Equipment, wireless terminal equipment in industrial control, wireless terminal equipment in self driving, wireless terminal equipment in remote medical, wireless terminal equipment in smart grid , wireless terminal equipment in transportation safety, wireless terminal equipment in smart city, or wireless terminal equipment in smart home.

As an example but not a limitation, in this embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices, which is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not only a hardware device, but also achieve powerful functions through software support, data interaction, and cloud interaction. Generalized wearable smart devices include full-featured, large-sized, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application functions, and need to cooperate with other devices such as smart phones Use, such as various smart bracelets and smart jewelry for physical sign monitoring.

In the embodiment of the present application, the network device may be a device for communicating with the mobile device, and the network device may be an access point (Access Point, AP) in WLAN, a base station (Base Transceiver Station, BTS) in GSM or CDMA , or a base station (NodeB, NB) in WCDMA, or an evolved base station (Evolutional Node B, eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, and an NR network The network equipment (gNB) in the network or the network equipment in the future evolved PLMN network, etc.

As an example but not a limitation, in this embodiment of the present application, the network device may have a mobile feature, for example, the network device may be a mobile device. Optionally, the network equipment may be a satellite or a balloon station. For example, the satellite can be a low earth orbit (low earth orbit, LEO) satellite, a medium earth orbit (medium earth orbit, MEO) satellite, a geosynchronous earth orbit (geosynchronous earth orbit, GEO) satellite, a high elliptical orbit (High Elliptical Orbit, HEO) satellite. ) Satellite etc. Optionally, the network device may also be a base station installed on land, water, and other locations.

In this embodiment of the present application, the network device may provide services for a cell, and the terminal device communicates with the network device through the transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell, and the cell may be a network device ( For example, a cell corresponding to a base station), the cell may belong to a macro base station, or may belong to a base station corresponding to a small cell (Small cell), and the small cell here may include: a metro cell (Metro cell), a micro cell (Micro cell), a pico cell ( Pico cell), Femto cell, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

FIG. 1 schematically shows a wireless communication system 1000 including one network device 1100 and two terminal devices 1200 . Optionally, the wireless communication system 1000 may include multiple network devices 1100, and the coverage of each network device 1100 may include other numbers of terminal devices, which is not limited in this embodiment of the present application. Optionally, the wireless communication system 1000 shown in FIG. 1 may also include other network entities such as a mobility management entity (Mobility Management Entity, MME), an access and mobility management function (Access and Mobility Management Function, AMF), etc. The embodiment of the application does not limit this.

It should be understood that a device with a communication function in the network/system in the embodiment of the present application may be referred to as a communication device. Taking the communication system shown in Figure 1 as an example, the communication equipment may include network equipment and terminal equipment with communication functions. It may include other devices in the communication system, such as network controllers, mobility management entities and other network entities, which are not limited in this embodiment of the present application.

It should be understood that the terms "system" and "network" are often used interchangeably herein. In this article, the term "and/or" is used to describe the association relationship of associated objects, for example, it means that there may be three relationships between the associated objects before and after. There are three cases of B alone. In this paper, the character "/" generally indicates that the contextual objects are "or" relationships.

It should be understood that the "indication" mentioned in the embodiments of the present application may be a direct indication, may also be an indirect indication, and may also mean that there is an association relationship. For example, A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also indicate that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also indicate that there is an association between A and B relation.

In the description of the embodiments of the present application, the term "corresponding" may indicate that there is a direct or indirect correspondence between the two, or that there is an association between the two, or that it indicates and is indicated, configuration and is configuration etc.

In order to facilitate the understanding of the technical solutions of the embodiments of the present application, the related technologies of the embodiments of the present application are described below. The following related technologies can be combined with the technical solutions of the embodiments of the present application as optional solutions, and all of them belong to the embodiments of the present application. protected range.

(1) RACH

The random access process is a basic process defined by the MAC (Medium Access Control) layer. NR MAC follows the four-step contention-based random access process and the non-contention-based random access process of LTE.

In the evolution of subsequent standards, in order to further optimize the random access process, a contention-based two-step random access process and a non-contention-based two-step random access process were introduced, the purpose of which is to reduce the time in the random access process. delay and signaling overhead. In addition, considering that NR also needs to support unlicensed spectrum, the two-step random access process can further reduce the number of channel preemption compared with the four-step random access process, thereby improving spectrum utilization. Taking the contention-based random access procedure as an example, the four-step random access procedure is shown in FIG. 2A , and the two-step random access procedure is shown in FIG. 2B .

As shown in FIG. 2A , the contention-based four-step random access process requires four signaling interactions.

Step 1: UE selects a random access resource and transmits a preamble. The message in this step is called the first step message (Msg1). Before sending Msg1, the UE needs to measure the quality of the reference signal, so as to select a relatively good reference signal and the corresponding random access resource and preamble.

Step 2: The UE receives the RAR (Random Access Response, Random Access Response) sent by the network in the pre-configured receiving window. The message in this step is called the second step message (Msg2). The RAR includes the timing advance for subsequent uplink data transmission, the uplink authorization and TC-RNTI (Temporary Cell-Radio Network Temporary Identifier, temporary cell radio network temporary identifier).

Step 3: The UE performs uplink transmission according to the scheduling information in the random access response, that is, the transmission of the third step message (Msg3). Msg3 will carry the UE identity for subsequent contention conflict resolution; In the RRC (Radio Resource Control, radio resource control) state at the location, this identifier will be different. A UE in the RRC connected state will carry a C-RNTI in Msg3, while a UE in the RRC idle state and inactive state will carry an RRC layer UE identifier in Msg3. Regardless of the form of identification, this identification can allow the network to uniquely identify the UE.

Step 4: After sending the Msg3, the UE will receive the contention conflict resolution message sent by the network within a specified time. Generally speaking, if the network can successfully receive the Msg3 sent by the UE, the network has identified the UE, which means that the contention conflict is resolved on the network side. For the UE side, if the UE can detect the contention conflict resolution identifier in the fourth step message (Msg4) of network scheduling, it means that the conflict has also been resolved on the UE side.

On the basis of contention-based four-step random access, NR further introduces a contention-based two-step random access process, which only includes two signaling interactions. Specifically, as shown in Figure 2B, the first message is called message A (MsgA), and MsgA includes the preamble transmitted on the random access resource and the PUSCH (Physical Uplink Shared Channel, Physical Uplink Shared Channel) transmitted on the The load information may correspond to Msg1 and Msg3 in the contention-based four-step random access process. The second message is called message B (MsgB), and MsgB may correspond to Msg2 and Msg4 in the contention-based four-step random access process.

After the UE selects the two-step random access procedure and transmits MsgA, it needs to monitor MsgB within the configured window. Referring to the design of contention-based four-step random access, there are different MsgB monitoring behaviors for UEs in different RRC connection states. Generally speaking, when the UE is in the RRC connection state, that is to say, when the UE carries the C-RNTI in MsgA, the UE will monitor the C-RNTI scrambled PDCCH (Physical Downlink Control Channel, physical downlink control channel) and MsgB-RNTI Scrambled PDCCH. When the UE is in the RRC idle state or inactive state, there is no specific RNTI, so the UE carries the RRC message in MsgA as an identifier, and monitors the PDCCH scrambled by MsgB-RNTI. The calculation of MsgB-RNTI refers to the design of RA-RNTI (Random Access-Radio Network Temporary Identifier, Random Access-Radio Network Temporary Identifier) used to schedule RAR in the four-step random access process, that is, based on the UE transmitting MsgA The time-frequency position of the selected random access resource. Considering that two-step random access resources and four-step random access resources will be reused, in order to avoid confusion when different types of UEs receive network feedback, MsgB-RNTI adds an offset on the basis of RA-RNTI.

For the MsgB message, as before, it corresponds to Msg2 and Msg4 in the contention-based four-step random access process, so its design needs to consider the functions of Msg2 and Msg4. On the one hand, the MsgB should support contention conflict resolution, such as the contention conflict resolution identifier and the RRC message corresponding to the UE. On the other hand, MsgB also needs to support the contents of Msg2, such as random avoidance instructions and contents in RAR. The main reason here is that for the network side, when receiving and decoding MsgA, on the one hand, the network may be able to successfully decode all the content of MsgA, such as the preamble and the payload message of MsgA, so that the network can send contention conflict resolution messages through MsgB, That is, the function corresponding to Msg4. There is also a possibility that the network only decodes the preamble in MsgA but does not solve the payload in MsgA. In this case, the network does not recognize the UE, but the network can still send a fallback indication through MsgB (corresponding to the function of Msg2) to instruct the UE to continue sending Msg3 without retransmitting MsgA. This fallback can also be called fallback based on MsgB, as shown in FIG. 3 .

If the UE fails to access successfully after receiving the fallback indication from MsgB and transmitting Msg3 based on the scheduling resources included in the fallback indication, the terminal can retry the transmission of MsgA. In addition, the network can configure the maximum number of MsgA attempts (msgA-TransMax) for the terminal. When the number of MsgA attempts by the terminal exceeds the configured maximum number, the terminal can switch/fall back to the contention-based four-step random access process Proceed with the access attempt.

(2) Enhancement of access network slices

The strong demand for wireless communication in vertical industries is obvious to all. In order to meet the requirements of vertical industries for delay, mobility, reliability, and location accuracy, RAN needs to enhance how to support vertical services in the access network. Among them, one way is to provide lower latency, more targeted, greater flexibility and higher scalability services for multiple services with different requirements based on network slicing. More specifically, the introduction of network slicing allows application providers to participate in the design, deployment, and operation of customized RANs to better support application providers' businesses. Therefore, Release 17 introduces enhancements to slices in the access network, specifically related to the mechanism for enabling UEs to quickly access cells that support desired slices, including:

Slice-based cell reselection under network control;

Slice-based RACH configuration or access restrictions.

The random access process for slices (R17slice-specific RACH) supports the fallback from the two-step random access process for slices to the four-step random access process for slices, or the fallback from the two-step random access process for slices to the four-step universal random access process.

However, the technical details of returning from the two-step random access process for slices to the four-step random access process or four-step universal random access process for slices are not clear in the related art.

The solutions provided in the embodiments of the present application are mainly used to solve at least one of the above problems.

In order to understand the characteristics and technical contents of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The attached drawings are only for reference and description, and are not intended to limit the embodiments of the present invention.

Fig. 4 is a schematic flowchart of a random access method according to an embodiment of the present application. The method can optionally be applied to the system shown in Fig. 1, but is not limited thereto. The method includes:

S110. The terminal device determines whether to perform rollback from the first random access procedure to the second random access procedure based on the first information sent by the network device;

Corresponding to the foregoing method, FIG. 5 is a schematic flowchart of a random access method according to another embodiment of the present application. The method can optionally be applied to the system shown in Fig. 1, but is not limited thereto. The method includes:

S210. The network device sends first information to the terminal device, so that the terminal device determines whether to perform a fallback from the first random access procedure to the second random access procedure based on the first information;

It should be noted that, in the embodiment of the present application, the rollback of the random access procedure may also be referred to as switching of the random access procedure.

In the embodiment of the present application, there are multiple implementation manners for the first information.

An exemplary implementation manner is that the first information may be information for falling back to the second random access procedure. It may indicate whether to support the fallback of the terminal device from the first random access procedure to the second random access procedure, and may also indicate whether to perform a fallback from the first random access procedure to the second random access procedure. When the first information indicates support or execution, the terminal device may perform fallback from the first random access procedure to the second random access procedure. When the first information indicates that it is not supported or not executed, the terminal device does not perform the fallback from the first random access procedure to the second random access procedure; Rollback of the third random access procedure.

Another exemplary implementation manner is that the first information may also be information for falling back to the third random access procedure. It may indicate whether to support the fallback of the terminal device from the first random access procedure to the third random access procedure, and may also indicate whether to perform a fallback from the first random access procedure to the third random access procedure. When the first information indicates that it is not supported or not executed, the terminal device may perform fallback from the first random access procedure to the second random access procedure. When the first information indicates support or execution, the terminal device does not perform the fallback from the first random access procedure to the second random access procedure; alternatively, the terminal device may perform the fallback from the first random access procedure to the third Fallback of the random access procedure.

Optionally, the first information from the network device may directly or indirectly indicate whether random access backoff is supported or performed. The following uses an example in which the first information is information for falling back to the second random access procedure as an example to describe in detail. It can be understood that, in a case where the first information is information for falling back to the third random access procedure, a similar implementation manner may be adopted.

Exemplarily, the first information may be confirmation information (true) or non-confirmation information (false). The value of the first information is true, which means that the network device supports the fallback of the terminal device from the first random access process to the second random access process, or the network device instructs the terminal device to perform the transition from the first random access process to the second random access process. The fallback of the access process. The value of the first information is false, which means that the network device does not support the fallback of the terminal device from the first random access process to the second random access process, or the network device instructs the terminal device not to perform the transition from the first random access process to the second random access process. 2. Rollback of the random access process. For example, the first information can be 1-bit information, and the value of 1 is confirmation information, and the value of 0 is non-confirmation information; or, the value of 1 is non-confirmation information, and the value of 0 is confirmation information .

Exemplarily, the first information may be sent when the network device supports or needs to instruct the terminal device to perform a fallback from the first random access procedure to the second random access procedure. When the terminal device receives the first information, it may be determined that the network device supports or the network device instructs the terminal device to perform fallback from the first random access procedure to the second random access procedure. When the terminal device does not receive the first information, it may be determined that the network device does not support or the network device instructs the terminal device not to perform the fallback from the first random access procedure to the second random access procedure.

Exemplarily, when the network device supports or instructs the terminal device to perform a fallback from the first random access procedure to the second random access procedure, the first message sent by the network device to the terminal device includes the first information ; When the network device does not support or the network device instructs the terminal device not to perform the fallback from the first random access procedure to the second random access procedure, the first message sent by the network device to the terminal device does not include the second random access procedure a message. In this way, the terminal device may determine whether to perform a rollback from the first random access procedure to the second random access procedure according to whether the first information appears in the received first message.

Exemplarily, the first information may also include the maximum number of transmissions and/or resources for the random access procedure. For example, the first information may be configuration information about the maximum number of transmissions, or resource configuration information. Here, the resources of the random access process may include a preamble group and/or a random access opportunity (RACH Occasion, RO). The first information indirectly indicates whether to support or perform fallback from the first random access procedure to the second random access procedure or the third random access procedure based on the maximum number of transmission times and/or resources.

For example, when the first information includes the maximum number of transmissions for the second random access procedure, and/or, the first information does not include the maximum number of transmissions for the third random access procedure, and/or, the first information for In the case where the maximum number of transmissions of the second random access procedure is greater than or equal to 1, the first information is used to indicate that the terminal device is supported to perform a fallback from the first random access procedure to the second random access procedure, or to indicate not The terminal device is supported to perform fallback from the first random access procedure to the third random access procedure.

For another example, when the first information includes the maximum number of transmissions for the third random access procedure, and/or, the first information does not include the maximum number of transmissions for the second random access procedure, and/or, in the first information For the case where the maximum number of transmissions of the third random access procedure is greater than or equal to 1, the first information is used to instruct the terminal device to support the rollback from the first random access procedure to the third random access procedure, or to indicate The terminal device is not supported to perform fallback from the first random access procedure to the second random access procedure.

For another example, when the first information includes the maximum number of transmissions for the third random access procedure, and/or, the maximum number of transmissions for the third random access procedure in the first information is greater than or equal to 1, if the first If the information does not include resources for the third random access procedure, the first information is used to instruct the support terminal device to perform fallback from the first random access procedure to the second random access procedure.

For another example, when the first information includes the maximum number of transmissions for the third random access procedure, and/or, the maximum number of transmissions for the third random access procedure in the first information is greater than or equal to 1, if the first The information includes resources for the second random access procedure, and the first information is used to instruct the support terminal device to perform fallback from the first random access procedure to the second random access procedure.

For another example, the first information includes the maximum number of transmissions for the second random access procedure, and the first information indicates that the maximum number of transmissions for the second random access procedure is not used for the third random access procedure In the case of an access procedure, the terminal device performs a rollback from the first random access procedure to the second random access procedure, or the terminal device does not perform a fallback from the first random access procedure A fallback procedure to the third random access procedure, or, the terminal device does not perform a fallback from the first random access procedure.

For another example, the first information includes the maximum number of transmissions for the second random access procedure, and the first information indicates that the maximum number of transmissions for the second random access procedure is not used to fall back to In the case of the third random access procedure, the terminal device performs a rollback from the first random access procedure to the second random access procedure, or the terminal device does not perform the fallback from the The fallback from the first random access procedure to the third random access procedure, or, the terminal device does not perform the fallback from the first random access procedure.

For another example, the first information includes a maximum number of transmissions for a random access procedure, and the first information indicates that the maximum number of transmissions for a random access procedure is not used for the third random access procedure In this case, the terminal device performs a fallback from the first random access procedure to the second random access procedure, or the terminal device does not perform the fallback from the first random access procedure to the The fallback of the third random access procedure, or, the terminal device does not perform the fallback from the first random access procedure.

It should be noted that the first information may include multiple types of information. For example, the first information includes direct indication information and/or maximum transmission times and/or resources. For another example, the first information includes multiple maximum transmission times. Optionally, the above multiple information may be carried in the first information, or may be carried in different information.

Optionally, the first random access procedure may include a slice-specific random access procedure.

In an exemplary implementation manner, the second random access process may include a random access process for non-slicing, or a random access process for general resources, or a general random access process. Optionally, the third random access procedure includes a random access procedure for slices.

Wherein, as an example but not a limitation, the first random access process may include a two-step random access process for a slice, and the third random access process may include a four-step random access process for a slice.

Wherein, as an example but not a limitation, the second random access process may include a four-step random access process for non-slicing, or a four-step random access process for common resources, or a four-step universal random access process.

In another exemplary implementation manner, the second random access procedure may include a slice-specific random access procedure. Optionally, the third random access procedure may include a random access procedure for non-slicing, or a random access procedure for general resources, or a general random access procedure.

Wherein, as an example but not a limitation, the first random access process may include a two-step random access process for a slice, and the second random access process may include a four-step random access process for a slice.

Wherein, as an example but not a limitation, the third random access procedure may include a four-step random access procedure for non-slicing, or a four-step random access procedure for common resources, or a four-step universal random access procedure.

During specific implementation, when the second random access procedure is a random access procedure for a slice, the aforementioned maximum number of transmissions for the second random access procedure is the maximum number of random access transmissions for a slice. Similarly, in the case that the third random access procedure is a random access procedure for a slice, the foregoing maximum number of transmissions for the third random access procedure is the maximum number of random access transmissions for a slice.

It should be noted that the maximum number of random access transmissions for a slice is different from the maximum number of transmissions (parameter msgA-TransMax) of message A in the two-step random access process in the aforementioned related art. Optionally, the maximum number of transmissions for a slice is one of positive integers greater than or equal to 1. Optionally, the maximum number of random access transmissions for a slice may be a common parameter for each slice or a different parameter for different slices.

Optionally, the first information corresponds to one of the multiple slices, and the first information is applicable to the corresponding slice. For example, the first information may include the aforementioned maximum number of random access transmissions for a slice, each slice corresponds to a maximum number of random access transmissions for a slice, and the maximum number of random access transmissions for a slice corresponding to different slices may be different.

Optionally, the first information corresponds to one slice group in the multiple slice groups, and the first information is applicable to multiple slices in the corresponding slice group. For example, the first information may include the aforementioned maximum number of random access transmissions for a slice, each slice group corresponds to a maximum number of random access transmissions for a slice, and each slice in the same slice group corresponds to the same number of random access transmissions for a slice. The maximum number of random access transmissions; the maximum number of random access transmissions for slices corresponding to different slice groups may be different.

Optionally, the first information is applicable to multiple slices or multiple slice groups, that is, the first information is common to all slices.

It can be seen that, according to the random access method of the embodiment of the present application, whether the terminal device performs the fallback from the first random access procedure to the second random access procedure is based on whether the network device supports or instructs the terminal device to perform the fallback from the first random access procedure to the second random access procedure. The fallback of the second random access procedure is determined, or based on whether the network device supports or instructs the terminal device to perform fallback to other random access procedures. In this way, the terminal device can correctly implement the rollback of the random access procedure. In practical applications, the terminal device may determine whether the first condition is satisfied based on the first information, and thus determine whether to perform a rollback from the first random access procedure to the second random access procedure according to whether the first condition is satisfied. That is, the first condition is a condition for the terminal device to fall back to the second random access procedure.

Specifically, the terminal device determines whether to perform a fallback from the first random access procedure to the second random access procedure based on the first information sent by the network device, including:

The terminal device executes rollback from the first random access procedure to the second random access procedure when it is determined based on the first information that the first condition is met.

Optionally, the terminal device determines whether to perform a fallback from the first random access procedure to the second random access procedure based on the first information sent by the network device, and may further include:

When the terminal device determines based on the first information that the first condition is not met, the terminal device does not perform rollback from the first random access procedure to the second random access procedure.

In practical applications, the terminal device may also determine whether to perform a fallback from the first random access procedure to the third random access procedure according to whether the first condition is satisfied.

Exemplarily, the terminal device does not perform rollback from the first random access procedure to the third random access procedure when it is determined based on the first information that the first condition is satisfied.

Exemplarily, the terminal device executes a fallback from the first random access procedure to the third random access procedure when it is determined based on the first information that the first condition is not satisfied.

The first random access process is a slice-specific two-step random access process (2-step slice-specific RACH), and the second random access process is a four-step general random access process (4-step common RACH). The three random access process is a slice-oriented four-step random access process (4-step slice-specific RACH) as an example, and the first condition is a condition for falling back to the general random access process. When the first condition is met, for example, the first information indicates that the fallback to the general random access procedure is supported, the first information indicates that the fallback to the slice-specific random access procedure is not supported, and the maximum transmission of the general random access procedure is configured. The terminal device can determine that the fallback from the two-step random access process for the slice to the four-step general random access process is not the four-step random access process for the slice. Access process. If the first condition is not satisfied, the terminal device may determine that the fallback from the two-step random access procedure for the slice is the four-step random access procedure for the slice instead of the four-step general random access procedure.

The first random access process is a two-step random access process (2-step slice-specific RACH) for slices, and the second random access process is a four-step random access process (4-step slice-specific RACH) for slices. RACH), the third random access process is a four-step common random access process (4-step common RACH) as an example, and the first condition is a condition for falling back to the four-step random access process for slices. When the first condition is met, for example, the first information indicates that the fallback to the random access procedure for the slice is supported, the first information indicates that the fallback to the general random access procedure is not supported, and the maximum random access procedure for the slice is configured. The number of transmissions or the maximum number of transmissions when the general random access process is not configured, etc., the terminal device can determine that the fallback from the two-step random access process for the slice is the four-step random access process for the slice, not the four-step general random access process random access process. If the first condition is not satisfied, the terminal device may determine that the fallback from the two-step random access process for the slice is the four-step general random access process instead of the four-step random access process for the slice.

Optionally, the first information may be used in some specific cases to determine whether to fall back to the second random access procedure.

Exemplarily, the above method may also include:

The preamble group configured in the first random access procedure is different from the preamble group configured in the second random access procedure, or the preamble group selection threshold configured in the first random access procedure is different from the preamble group configured in the second random access procedure If the code group selection thresholds are different, the terminal device falls back to the second random access procedure or determines whether the first condition is met based on the first information;

or,

The preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is different from the preamble group configured in the third random access procedure If the code group selection thresholds are different, the terminal device falls back to the second random access procedure or determines whether the first condition is met based on the first information;

or,

The preamble group configured in the first random access procedure is the same as the preamble group configured in the second random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as the preamble group configured in the second random access procedure In the case that the code group selection threshold is the same, the terminal device falls back to the second random access procedure or determines whether the first condition is met based on the first information;

or,

The preamble group configured in the first random access procedure is the same as the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as the preamble group configured in the third random access procedure In the case that the code group selection threshold is the same, the terminal device falls back to the second random access procedure or determines whether the first condition is met based on the first information.

Wherein, the preamble groups configured in the two random access procedures are different, which means that the preamble groups configured in the two random access procedures are not completely the same. For example, preamble group A and preamble group B are configured for 2-step slice-specific RACH, but only preamble group B is configured for 4-step common RACH. group A or preamble group B, the preamble group configured for 2-step slice-specific RACH is different from the preamble group configured for 4-step common RACH. For another example, 2-step slice-specific RACH is only configured with preamble group A or preamble group B, however, 4-step common RACH is configured with preamble group A and preamble group B, then the preamble of 2-step slice-specific RACH configuration The group is different from the preamble group for 4-step common RACH configuration.

It can be seen that, when the preamble group configuration of the random access procedure satisfies the conditions, the terminal device can directly determine to fall back to the second random access procedure. Or, when the preamble group configuration of the random access procedure satisfies the condition, the terminal device needs to use the first information to judge whether the first condition is met, such as whether the network supports it, and whether the network indicates execution, so as to determine whether to fall back to the second random access procedure. Access process.

Correspondingly, for the network device, the network device sends the first information to the terminal device, including:

The preamble group configured in the first random access procedure is different from the preamble group configured in the second random access procedure, or the preamble group selection threshold configured in the first random access procedure is different from the preamble group configured in the second random access procedure In the case of different group selection thresholds, the network device sends the first information to the terminal device;

or,

The preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is different from the preamble group configured in the third random access procedure In the case of different group selection thresholds, the network device sends the first information to the terminal device;

or,

The preamble group configured in the first random access procedure is the same as the preamble group configured in the second random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as the preamble group configured in the second random access procedure In the case of the same group selection threshold, the network device sends the first information to the terminal device;

or,

The preamble group configured in the first random access procedure is the same as the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as the preamble group configured in the third random access procedure In the case that the group selection thresholds are the same, the network device sends the first information to the terminal device.

Optionally, the above method may further include: the preamble group configured in the first random access procedure is the same as the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure In a case where the preamble group selection threshold configured in the third random access procedure is the same, the terminal device falls back to the third random access procedure. That is to say, in some cases, the terminal device can directly fall back to the third random access procedure.

Optionally, the first condition may include at least one of the following conditions 1-11:

Condition 1: The first message is received.

For example, the first information is sent only when the network device supports fallback to the second random access procedure, then the first condition includes condition 1.

Condition 2: first information appears in the first message sent by the network device.

For example, if the network device supports falling back to the second random access procedure, the network device will send the first message carrying the first information, and the first condition includes condition 2.

Condition 3: the first information indicates that the terminal device is supported to perform fallback from the first random access procedure to the second random access procedure.

For example, in a case where the first information is a direct indication or an indirect indication whether to support fallback from the first random access procedure to the second random access procedure, the first condition includes condition 3.

Condition 4: the first information includes the maximum number of transmissions for the second random access procedure.

For example, in the case where the first information is used to configure the maximum number of transmissions, and indicates whether to support fallback from the first random access procedure to the second random access procedure based on the maximum number of transmissions, the first condition includes condition 4.

Condition 5: the first information does not include the maximum number of transmissions for the third random access procedure.

For example, in a case where the first information is used to configure the maximum number of transmissions, and indicates whether to support fallback from the first random access procedure to the second random access procedure based on the maximum number of transmissions, the first condition includes condition 5.

Condition 6: the first information does not include the maximum number of random access transmissions for the slice.

For example, when the second random access procedure is a general random access procedure, and the first information is used to configure the maximum number of transmission times, based on the maximum number of transmission times, it indicates whether to support the process from the first random access procedure to the second random access procedure In the case of fallback, the first condition includes condition 6.

Condition 7: No resources for the third random access procedure are configured.

For example, when the first information sent by the network device is resource configuration information, based on whether the resource indication of the third random access process is configured to support the fallback from the first random access process to the second random access process, The first condition includes condition 7.

Condition 8: the first information includes the maximum number of random access transmissions for a slice.

For example, when the second random access procedure is a random access procedure for a slice, and the first information is used to configure the maximum number of transmission times, based on the maximum number of transmission times, it indicates whether to support the transition from the first random access procedure to the second random access procedure In case of fallback, the first condition includes condition 8.

Condition 9: The maximum number of random access transmissions for a slice is less than 1.

For example, when the second random access procedure is a general random access procedure, and the first information is used to configure the maximum number of transmission times, based on the maximum number of transmission times, it indicates whether to support the process from the first random access procedure to the second random access procedure In the case of fallback, the first condition includes condition 9.

Condition 10: resources for the second random access procedure are configured.

For example, the first information sent by the network device is resource configuration information. In the case of whether to support the fallback from the first random access procedure to the second random access procedure based on whether the resource indication of the second random access procedure is configured, the second A condition includes condition 10.

Condition 11: the use condition of the first information is met.

For example, when the first information sent by the network device indicates that the terminal device is supported to perform rollback from the first random access procedure to the second random access procedure, condition 11 must also be satisfied before the rollback can be performed, that is, the first condition Condition 11 is included.

It can be understood that the above conditions 1-11 can be used alone or simultaneously.

For example, in the case where the first information directly indicates whether to support fallback from the first random access procedure to the second random access procedure, the first condition may include the above conditions 1, 3 and 11 at the same time.

For another example, when the second random access procedure is a general random access procedure, and the first information is used to configure the maximum number of transmissions, the first condition may include the above-mentioned conditions 4, 5, and 11 at the same time, or include the above-mentioned Conditions 4, 6, 11, or both conditions 8 and 9 above.

Optionally, the usage conditions of the first information may include at least one of the following conditions A-K:

Condition A: the number of preamble transmissions in the first random access process is greater than the maximum number of random access transmissions for the slice;

Condition B: No resources for the third random access procedure are configured;

Condition C: the preamble group configured in the first random access procedure is the same as the preamble group configured in the second random access procedure;

Condition D: the preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure;

Condition E: configuring resources for the second random access procedure;

Condition F: configure the maximum number of transmissions for the second random access procedure;

Condition G: the maximum number of transmissions for the third random access procedure is not configured;

Condition H: The maximum number of random access transmissions for slices is not configured;

Condition 1: configure the maximum number of transmissions for the third random access procedure;

Condition J: Configure the maximum number of random access transmissions for slices;

Condition K: the maximum number of random access transmissions for the slice or the maximum number of transmissions for the third random access procedure is greater than or equal to 1.

It can be understood that the above conditions A-K can be used alone or in combination.

For example, in the case that the second random access procedure is a general random access procedure, the first condition may include the above-mentioned conditions A-G at the same time, or include the above-mentioned conditions A-F and H at the same time.

It can be seen that the above describes how the terminal device determines whether to perform a fallback from the first random access procedure to the second random access procedure in the embodiment of the present application from different angles. Optionally, this embodiment of the present application may also include obtaining a MAC PDU (Protocol Data Unit, protocol data unit).

Exemplarily, the above method further includes:

In the case of performing a fallback from the first random access procedure to the second random access procedure, the terminal device obtains the first random access procedure in the second random access procedure based on the MAC PDU of message A in the first random access procedure MAC PDU of the three-step message.

Wherein, as an example but not a limitation, the first random access process may be a two-step random access process such as a two-step random access process for a slice. The second random access process may be a four-step random access process, such as a four-step general random access process, a four-step random access process for non-slicing, or a four-step random access process for slices. Correspondingly, message A may be MsgA in the two-step random access process, and the third-step message may be Msg 3 in the four-step random access process.

Exemplarily, the terminal device obtains the MAC PDU of the third step message in the second random access process based on the MAC PDU of message A in the first random access process, including:

If the second condition is met, the terminal device uses the MAC PDU of message A in the first random access process as the MAC PDU of the third step message in the second random access process;

and / or,

If the third condition is met, the terminal device reassembles the packet based on the MAC PDU of message A in the first random access process, and obtains the MAC PDU in the third step message of the second random access process.

Exemplarily, the second condition includes at least one of the following:

The preamble group configured in the first random access procedure is the same as the preamble group configured in the second random access procedure;

The preamble group selection threshold configured in the first random access procedure is the same as the preamble group selection threshold configured in the second random access procedure;

Therefore, the grant size of the third step message in the second random access procedure is the same as the MAC PDU size of message A in the first random access procedure.

Exemplarily, the third condition may include at least one of the following:

The preamble group configured in the first random access procedure is different from the preamble group configured in the second random access procedure;

The preamble group selection threshold configured in the first random access procedure is different from the preamble group selection threshold configured in the second random access procedure;

Therefore, the authorization size of the third step message in the second random access procedure is different from the MAC PDU size of message A in the first random access procedure.

Optionally, in the process of reassembling packets based on the MAC PDU of message A in the first random access process, the terminal device multiplexes the data and/or the MAC CE according to the priority of the data and/or the priority of the MAC CE .

For example, the terminal device may multiplex data and/or MAC CE according to logical channel priority (Logical channel priority, LCP), including data priority and/or MAC CE priority.

Optionally, in the process of reassembling packets based on the MAC PDU of message A in the first random access process, the terminal device preferentially multiplexes data. For example, the priority of data is higher than that of MAC CE, and the terminal equipment prioritizes multiplexing data.

Optionally, in the process that the terminal device reassembles packets based on the MAC PDU of message A in the first random access process, if the resource size of the third step message in the second random access process is greater than that of the first random access process The authorized size of message A in the process, the terminal device fills the remaining space of the PDU based on preset bits or new data. Wherein, the preset bit is 0 or 1, for example.

Optionally, before the terminal device obtains the MAC PDU of the third step message in the second random access process based on the MAC PDU of the message A in the first random access process, the above method further Can include:

The terminal device obtains the MAC PDU of message A in the message A buffer.

Optionally, the above method may also include:

The terminal device saves the MAC PDU of the third-step message in the second random access process obtained based on the MAC PDU of message A in the first random access process in the third-step message buffer.

Exemplarily, the above method further includes:

In the case of performing a fallback from the first random access procedure to the third random access procedure, the terminal device obtains the third The MAC PDU of the third step message in the random access process.

Wherein, as an example but not a limitation, the first random access process may be a two-step random access process such as a two-step random access process for a slice. The third random access process may be a four-step random access process, such as a four-step random access process for slices, a four-step general random access process, or a four-step random access process for non-slices. Correspondingly, message A may be MsgA in the two-step random access process, and the third-step message may be Msg 3 in the four-step random access process.

Optionally, the second condition includes at least one of the following:

The preamble group configured in the first random access procedure is the same as the preamble group configured in the third random access procedure;

The preamble group selection threshold configured in the first random access procedure is the same as the preamble group selection threshold configured in the third random access procedure;

Therefore, the grant size of the third step message in the third random access procedure is the same as the MAC PDU size of message A in the first random access procedure.

Optionally, the third condition includes at least one of the following:

The preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure;

The preamble group selection threshold configured in the first random access procedure is different from the preamble group selection threshold configured in the third random access procedure;

Therefore, the authorization size of the third step message in the third random access procedure is different from the MAC PDU size of message A in the first random access procedure.

For example, the terminal device can multiplex data and/or MAC CE according to LCP (including priority of data and/or priority of MAC CE).

Optionally, in the process of reassembling packets based on the MAC PDU of message A in the first random access process, if the resource size of the third step message in the third random access process is greater than that in the first random access process The authorized size of the message A, the terminal device fills the remaining space of the PDU based on preset bits or new data.

Optionally, before the terminal device obtains the MAC PDU of the third step message in the third random access process based on the MAC PDU of the message A in the first random access process, the method further includes :

The terminal device obtains the MAC PDU of message A in the message A buffer.

Optionally, the above method also includes:

The terminal device saves the MAC PDU of the third-step message in the third random access process obtained based on the MAC PDU of message A in the first random access process in the third-step message buffer.

It can be seen that the above describes from different perspectives how the terminal device obtains MAC PDU in the second random access procedure or the third random access procedure. Optionally, this embodiment of the present application may further provide a manner of stopping random access, stopping performing rollback of a random access procedure, or determining random access failure.

Exemplarily, the above method further includes:

When the fourth condition is met, the terminal device stops random access, stops performing rollback from the first random access procedure to the second random access procedure, or determines that the random access fails.

Exemplarily, the method also includes:

When the fourth condition is met, the terminal device stops random access, stops performing rollback from the first random access procedure to the third random access procedure, or determines that the random access fails.

Optionally, the fourth condition includes:

Condition L: the preamble group configured in the first random access procedure is different from the preamble group configured in the second random access procedure;

Condition M: the preamble group selection threshold configured in the first random access procedure is different from the preamble group selection threshold configured in the second random access procedure;

Condition N: So the grant size of the third step message in the second random access procedure is different from the MAC PDU size of message A in the first random access procedure;

Condition 0: the preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure;

Condition P: the preamble group selection threshold configured in the first random access procedure is different from the preamble group selection threshold configured in the third random access procedure;

Condition Q: So the grant size of the third step message in the third random access procedure is different from the MAC PDU size of message A in the first random access procedure.

The above conditions can be used alone or in combination.

For example, if the terminal device stops performing rollback from the first random access procedure to the second random access procedure when the fourth condition is satisfied, the fourth condition may include the above-mentioned conditions L-M at the same time. For another example, if the terminal device stops performing rollback from the first random access procedure to the third random access procedure when the fourth condition is met, the fourth condition may include the above conditions O-Q at the same time. For another example, if the terminal device stops random access or determines that the random access fails when the fourth condition is met, the fourth condition may include the above-mentioned conditions L-Q at the same time.

It can be seen that the foregoing describes how to stop random access, stop performing rollback of the random access process, or determine random access failure in the embodiments of the present application from different perspectives. Optionally, the embodiment of the present application further provides a configuration manner of random access resources. Exemplarily, the configuration manner of random access resources may be combined with the aforementioned random access method, or may be implemented independently.

Exemplarily, the above method further includes:

The terminal device acquires random access resources based on the resource configuration information sent by the network device; wherein the random access resources include general random access resources and/or slice-specific random access resources.

Correspondingly, for the network device, the method further includes:

The network device sends resource configuration information to the terminal device, where the resource configuration information is used to indicate random access resources, and the random access resources include general random access resources and/or slice-specific random access resources.

Optionally, in the case that the random access resources do not include random access resources for slices, the terminal device uses general random access resources to perform a random access process.

For example, in the case where only universal random access resources are configured and no random access resources for slices are configured, the terminal device can fall back from the two-step random access resources for slices to the four-step universal random access process, and A four-step universal random access procedure is performed using universal random access resources.

For another example, when only general random access resources are configured and slice-specific random access resources are not configured, the terminal device may use general random access resources to perform a general random access procedure or a slice-specific random access procedure.

Optionally, the random access resource for a slice is applicable to its corresponding slice or multiple slices in a corresponding slice group.

For example, the network configures corresponding random access resources for each slice, and each configured random access resource is only applicable to its corresponding slice, and random access resources used by different slices may be different.

For another example, the network configures corresponding random access resources for each slice group, and each configured random access resource is applicable to multiple slices in its corresponding slice group, and the random access resources used by different slice groups Can be different.

Optionally, the random access resource for a slice corresponds to at least one slice or at least one slice group.

That is to say, the network can configure one or more slice-specific random access resources (slice-specific RA resources), wherein one slice-specific RA resource can be associated with one or more slices/slice groups.

Optionally, each slice or each slice group corresponds to only one slice-specific random access resource.

That is to say, a slice or slice group can only be associated with one slice-specific RA resource. Based on this, the terminal device can uniquely determine the corresponding random access resource according to the slice information currently triggering the random access.

Exemplarily, the above random access method further includes:

If the slice information triggering random access is the first slice, the terminal device determines the slice group to which the first slice belongs based on the mapping relationship between the slice and the slice group, and based on the random access corresponding to the slice group, Incoming resources for random access.

Wherein, the mapping relationship between slices and slice groups is used to represent which slices are included in a slice group, or which slice group a slice belongs to. Specifically, if a slice group (slice group) includes multiple slices (slices), then if the UE's Non-Access Stratum (Non-Access Stratum, NAS) triggers The slice information of the RA is a slice, and the UE needs to determine the slice group to which it belongs according to the mapping relationship between the slice and the slice group, and use the RA resources corresponding to the slice group to perform random access. Wherein, further, the RA resources used by each slice in the slice group are the same as the RA resource parameters. Optionally, the mapping relationship between slice and slice group can be saved by UE AS or given by UE NAS.

Exemplarily, the above random access method further includes:

In the case where the random access resource for a slice configured in the resource configuration information is applicable to its corresponding slice group, if the slice information triggering random access is the first slice, the terminal device, based on the slice and The mapping relationship of the slice group determines the slice group to which the first slice belongs, and performs random access based on the random access resource corresponding to the slice group.

Specifically, if a slice group includes multiple slices, and the slice-specific RA resource indicated by the network is for the slice group, then, if the slice information that triggers RA to the AS from the UE NAS is slice, the UE needs to The mapping relationship with the slice group determines the slice group to which it belongs, and uses the RA resources corresponding to the slice group to perform random access. Wherein, further, the RA resources used by each slice in the slice group are the same as the RA resource parameters.

Exemplarily, the above random access method further includes:

In the case where the random access resource for a slice configured in the resource configuration information is applicable to its corresponding slice group, if the slice information triggering random access is the first slice group, the terminal device, based on the performing random access on the random access resource corresponding to the first slice group.

Specifically, if a slice group includes multiple slices, and the slice-specific RA resource indicated by the network is for the slice group, then if the slice information of the AS that triggers the RA given by the UE NAS is the slice group, the UE uses The RA resources corresponding to the slice group are randomly accessed.

Optionally, the resource configuration information is included in a system information block (System Information Block, SIB) and/or RRC signaling. That is, resource configuration information can be carried by SIB or RRC signaling.

Optionally, in the case where the first random access procedure is a random access procedure for a slice, the above method further includes:

The terminal device executes a first random access process based on the random access resource for the slice.

Optionally, in the random access resources, if the preamble group configured for the two-step random access procedure of the slice includes the first preamble group, then the preamble group configured for the four-step random access procedure includes the The first preamble group.

For example, if 2step slice-specific RA is configured with preamble group B, then 4step RA should also be configured with preamble group B. Here, 4step RA includes but not limited to 4step slice-specific RA, and/or, 4step common RA.

Optionally, in the case of supporting the fallback of the two-step random access procedure or supporting the fallback of the two-step random access procedure for the slice, if the preamble group configured for the two-step random access procedure for the slice includes the The first preamble group, the preamble group configured in the four-step random access procedure includes the first preamble group.

For example, when supporting 2step RA or 2step slice-specific RA fallback, if 2step slice-specific RA is configured with preamble group B, then 4step RA should also be configured with preamble group B

Optionally, the four-step random access process includes at least one of the following: a four-step random access process for slices, a four-step random access process for non-slices, a four-step random access process for general resources, Four-step universal random access procedure.

Optionally, if the random access resources include resources for a two-step random access process for a slice and resources for a four-step random access process for a slice, then the four-step random access process is for a slice Four-step random access process.

That is to say, if 4step slice-specific RA resources are also configured when 2step slice-specific RA resources are configured, the 4step RA can be 4step slice-specific RA.

Optionally, if the random access resources include resources for a two-step random access process for a slice but do not include resources for a four-step random access process for a slice, or if the random access resources include resources for a slice The resources of the two-step random access process but the resources of the four-step random access process in the random access resources are only configured with general random access resources, then the four-step random access process is a four-step random access process for non-slicing One-step random access procedure or four-step random access procedure for common resources or four-step universal random access procedure.

That is to say, if no 4step slice-specific RA resources are configured when configuring 2step slice-specific RA resources, or only common RA resources are configured for 4step RA resources when configuring 2step slice-specific RA resources, the 4step RA can be 4step common RA.

Optionally, the above random access method also includes:

When it is determined that no random access resource for the slice is configured, the access stratum (AS) of the terminal device sends second information to the non-access stratum (NAS) of the terminal device, and the second information is used to indicate the non-access The layer does not send slice information to the access layer.

Optionally, the embodiment of the present application further provides a cell reselection method, which may be combined with the above random access method, or may be implemented independently. The method includes:

The network device sends slice-specific cell reselection information to the terminal device, and/or, the terminal device obtains slice-specific cell reselection information (slice-specific cell reselection) configured by the network device; The cell reselection information of is applicable to its corresponding slice or corresponding slice group.

That is, the network can configure cell reselection information for slices. Here, the cell reselection information for a slice may be the cell reselection information used by a specific slice, or the cell reselection information used by a specific slice group. The cell reselection information also includes cell reselection parameters. Exemplarily, the network may configure one or more pieces of cell reselection information for slices.

Optionally, the slice-specific cell reselection information corresponds to at least one slice or at least one slice group.

That is to say, a slice-specific cell reselection parameter or information can be associated with one or more slices/slice groups.

Optionally, each slice or each slice group corresponds to only one slice-specific cell reselection information.

That is to say, a slice or slice group can only be associated with one slice-specific cell reselection parameter or information. Based on this, the terminal device can uniquely determine the parameters or information of the corresponding slice-specific cell reselection based on the slice information that triggers the reselection.

Optionally, the above method also includes:

If the slice information triggering cell reselection is the second slice, the terminal device determines the slice group to which the second slice belongs based on the mapping relationship between the slice and the slice group, and based on the cell reselection information corresponding to the slice group , to perform cell reselection.

Specifically, if a slice group includes multiple slices, then if the slice information of the AS that triggers cell reselection (cell reselection) given by the UE NAS is a slice, the UE needs to determine the slice according to the mapping relationship between the slice and the slice group The slice group it belongs to, and use the parameters or information of reselection (reselection) corresponding to the slice group to perform cell reselection. Wherein, further, the reselection parameters or information used by each slice in the slice group are the same. Optionally, the mapping relationship between slice and slice group can be saved by UE AS or given by UE NAS.

Optionally, the above method also includes:

In the case that the cell reselection information for a slice is applicable to its corresponding slice group, if the slice information triggering cell reselection is the second slice, the terminal device determines the the slice group described in the second slice, and perform cell reselection based on the cell reselection information corresponding to the slice group.

Specifically, if a slice group includes multiple slices, and the slice-specific reselection parameters or information indicated by the network are for the slice group, then, if the slice information that triggers the cell reselection from the UE NAS to the AS is slice, then The UE needs to determine the slice group it belongs to according to the mapping relationship between the slice and the slice group, and use the reselection parameters or information corresponding to the slice group to perform cell reselection. Wherein, further, the reselection parameters or information used by each slice in the slice group are the same. Optionally, the mapping relationship between slice and slice group can be saved by UE AS or given by UE NAS.

Optionally, the above method also includes:

In the case that the cell reselection information for a slice is applicable to its corresponding slice group, if the slice information triggering cell reselection is the second slice group, the terminal device Reselection information for cell reselection.

Specifically, if a slice group includes multiple slices, and the slice-specific reselection parameters or information indicated by the network are for the slice group, then if the slice information that triggers the cell reselection from the UE NAS to the AS is slice group, Then the UE uses the reselection parameters or information corresponding to the slice group to perform cell reselection.

Optionally, the above method also includes:

In the case where the cell reselection information for a slice is applicable to its corresponding slice, if the slice information triggering cell reselection is a second slice, the terminal device is based on the cell reselection information corresponding to the second slice Perform cell reselection.

Specifically, if the slice-specific reselection parameters or information indicated by the network are for slices, then if the slice information that triggers cell reselection sent by the UE NAS to the AS is a slice, then the UE uses the slice-specific reselection parameters or information corresponding to the slice , to perform cell reselection.

Optionally, the above method also includes:

In the case that the cell reselection information for a slice is applicable to its corresponding slice, if the slice information triggering cell reselection is the second slice group, then the terminal device, based on the mapping relationship between the slice and the slice group, in the Determine a second slice from the second slice group, and perform cell reselection based on cell reselection information corresponding to the second slice.

Exemplarily, the terminal device may randomly select a slice in the second slice group as the second slice, or select the slice at the first position in the group as the second slice, or select the slice with the highest priority in the group as the second slice. The second slice, or select the slice at the last position in the group as the second slice, or select the slice with the lowest priority in the group as the second slice, or select the slice with the smallest slice identifier in the group as the second slice, Or select the slice with the largest slice ID in the group as the second slice. Specifically, if a slice group includes multiple slices, and the parameters or information of the slice-specific reselection indicated by the network are for the slice group, then, if the slice information that triggers the cell reselection from the UE NAS to the AS is the slice group, Then the terminal device selects a slice in the slice group, and uses the parameters or information of reselection corresponding to the selected slice to perform cell reselection.

Optionally, the cell reselection information for a slice includes a frequency point corresponding to a slice or a cell corresponding to a slice.

Optionally, the slice-specific cell reselection information is carried by SIB or dedicated signaling.

Optionally, when the slice supported by the cell is the same as the slice supported by the serving frequency point, the cell reselection information for the slice includes the frequency point of the cell corresponding to the slice. That is to say, when indicating supported slices, only the frequency point corresponding to the cell can be indicated without indicating the identity of the cell or the physical cell identifier (Physical Cell Identifier, PCI).

Optionally, when the slice supported by the cell is different from the slice supported by the service frequency point, the cell reselection information for the slice includes the frequency point of the cell corresponding to the slice and the cell identifier (Cell Identifier, CI) corresponding to the slice ) or PCI. Alternatively, the cell reselection information for a slice includes a cell identity CI or PCI corresponding to the cell, a frequency point corresponding to the cell, and slice information supported by the cell. Alternatively, the slice-specific cell reselection information includes a cell identity CI or PCI corresponding to the cell and slice information supported by the cell. Wherein, the slice information includes at least one of a slice identifier, a slice group identifier, and a frequency point priority corresponding to the slice. That is to say, when the slice supported by the cell is different from the slice supported by the service frequency point, the cell reselection information for the slice indicates the granularity of the cell, including the information used to identify the cell and the information used to identify the cell supported. slice information.

Optionally, the slice information supported by the serving cell is the same as the slice supported by the serving frequency point.

Correspondingly, in the case that the slice supported by the cell is the same as the slice supported by the serving cell, the cell reselection information for the slice includes the frequency point of the cell corresponding to the slice. That is to say, when indicating supported slices, only the frequency points corresponding to the cell may be indicated without indicating the identifier or PCI of the cell.

Correspondingly, when the slice supported by the cell is different from the slice supported by the serving cell, the cell reselection information for the slice includes the frequency point of the cell corresponding to the slice and the cell identity or PCI corresponding to the slice.

Optionally, the above method applied to cell reselection is also applicable to the cell selection (cell selection) process, that is, the embodiment of the present application also provides a cell selection method, which can be combined with the above random access method, cell reselection Methods can be combined or implemented independently. For this method, refer to the following optional methods for details.

Optionally, the method includes:

The network device sends cell selection information for the slice to the terminal device, and/or the terminal device acquires the cell selection information for the slice configured by the network device; wherein the cell selection information for the slice is applicable to its corresponding A slice or corresponding slice group.

Optionally, the slice-specific cell selection information corresponds to at least one slice or at least one slice group.

Optionally, each slice or each slice group corresponds to only one slice-specific cell selection information.

Optionally, the above method further includes: if the slice information triggering cell selection is a third slice, the terminal device determines the slice group to which the third slice belongs based on the mapping relationship between the slice and the slice group, and based on the The cell selection information corresponding to the slice group is used for cell selection.

Optionally, the above method further includes: in the case that the cell selection information for a slice is applicable to its corresponding slice group, if the slice information triggering cell selection is the third slice, the terminal device determine the slice group described in the third slice, and perform cell selection based on the cell selection information corresponding to the slice group.

Optionally, the above method further includes: in the case that the cell selection information for a slice is applicable to its corresponding slice group, if the slice information triggering cell selection is the third slice group, then the terminal device based on the The cell selection information corresponding to the third slice group performs cell selection.

Optionally, the above method further includes: in the case that the cell selection information for a slice is applicable to its corresponding slice, if the slice information triggering cell selection is a third slice, the terminal device, based on the third slice, The cell selection information corresponding to the slice is used for cell selection.

Optionally, the above method further includes: in the case that the cell selection information for a slice is applicable to its corresponding slice, if the slice information triggering cell selection is the third slice group, the terminal device The third slice is determined in the third slice group, and the cell selection is performed based on the cell selection information corresponding to the third slice.

Exemplarily, the terminal device may randomly select a slice in the third slice group as the third slice, or select the slice at the first position in the group as the third slice, or select the slice with the highest priority in the group as the third slice. The third slice, or select the slice at the last position in the group as the third slice, or select the slice with the lowest priority in the group as the third slice, or select the slice with the smallest slice identifier in the group as the third slice, or The slice with the largest slice identity within the group is selected as the third slice.

Optionally, the cell selection information for a slice includes a frequency point corresponding to a slice or a cell corresponding to a slice.

Optionally, the slice-specific cell selection information is carried by SIB or dedicated signaling.

Optionally, when the slice supported by the cell is the same as the slice supported by the serving frequency point, the cell selection information for the slice includes the frequency point of the cell corresponding to the slice. That is to say, when indicating supported slices, only the frequency points corresponding to the cell may be indicated without indicating the identifier or PCI of the cell.

Optionally, when the slice supported by the cell is different from the slice supported by the service frequency point, the cell selection information for the slice includes the frequency point of the cell corresponding to the slice and the cell identity CI or physical cell identity PCI corresponding to the slice . Alternatively, the cell reselection information for a slice includes a cell identity CI or PCI corresponding to the cell, a frequency point corresponding to the cell, and slice information supported by the cell. Alternatively, the cell reselection information for a slice includes a cell identity CI or PCI corresponding to the cell and slice information supported by the cell. Wherein, the slice information includes at least one of a slice identifier, a slice group identifier, and a frequency point priority corresponding to the slice.

Correspondingly, in the case that the slice supported by the cell is the same as the slice supported by the serving cell, the cell selection information for the slice includes the frequency point of the cell corresponding to the slice. That is to say, when indicating supported slices, only the frequency points corresponding to the cell may be indicated without indicating the identifier or PCI of the cell.

Correspondingly, when the slice supported by the cell is different from the slice supported by the serving cell, the cell selection information for the slice includes the frequency point of the cell corresponding to the slice and the cell identity CI or physical cell identity PCI corresponding to the slice.

Several application examples of the embodiments of the present application are provided below.

Application example one

In this application example, when the first condition is satisfied, the UE performs the first random access process (two-step random access process for slices, 2-step slice-specific RACH) to the second random access process (four Step common random access process, four-step random access process for common resources, 4-step common RACH) fallback or handover.

Referring to Figure 6, the specific implementation process of this application example is as follows:

1. The network configures RACH resources. Refer to one or more of the following implementation details:

a. The RACH resources include common random access resources (common RACH resources) and/or slice-specific RACH resources.

Wherein, optionally, if the slice is not configured with the RACH resource of the corresponding slice, it means that the UE uses the common RACH resource.

b. The RACH resources for slices may be RACH resources for slice groups.

Among them, optionally, all slices belonging to the same slice group use the same RACH resources

c. Configure RACH resources for slices through SIB and/or dedicated RRC signaling (dedicated RRC), such as RRC release messages.

d. The network indicates the first information, and the first information is used to indicate whether the UE is supported to perform fallback or switching from 2-step slice-specific RACH to 4-step common RACH:

Optionally, the first information is for each slice (per slice) or for each slice group (per slice group). Alternatively, the first information is common to each slice/slice group (slice/slice group common).

Optionally, the first information is the maximum number of MsgA transmissions for the slice, and this parameter is different from the msgA-TransMax parameter in the aforementioned related art. Optionally, the maximum number of MsgA transmissions for a slice is one of positive integers greater than or equal to 1. Optionally, the maximum number of MsgA transmissions for a slice may be common to the slice, or different for different slices.

Optionally, the first information is used when the preamble (preamble) groups configured by the 2-step slice-specific RACH and the 4-step common RACH are different. Or, the first information is used when the preamble groups configured by the 2-step slice-specific RACH and the 4-step slice-specific RACH are different. Or, vice versa (used when the preamble groups configured by 2-step slice-specific RACH and 4-step common RACH are the same. Or, the first information, in 2-step slice-specific RACH and 4-step slice-specific RACH configured preamble groups are the same).

For example, 2-step slice-specific RACH is configured with preamble group A and preamble group B, however, 4-step common RACH is only configured with preamble group A or preamble group B, that is, 2-step slice-specific RACH and 4-step slice -specific The preamble group configured by RACH is different.

For example, 2-step slice-specific RACH is only configured with preamble group A or preamble group B, however, 4-step common RACH is configured with preamble group A and preamble group B, that is, 2-step slice-specific RACH and 4-step slice -specific The preamble group configured by RACH is different.

2. The UE obtains the RACH configuration, and performs slice-specific RACH transmission according to the RACH resource corresponding to the slice. For example, when 2-step slice-specific RACH transmission is satisfied, the UE performs 2-step slice-specific RACH.

3. When the first condition is met, the UE performs fallback or switching from 2-step slice-specific RACH to 4-step common RACH.

a. The first condition includes at least one of the following: the first information is received, the first information appears, the first information is set to true, the value of the first information is greater than or equal to 1, and the first Conditions of Use of Information.

b. The usage conditions of the first information may include at least one of the following:

Preamble transmission times (PREAMBLE_TRANSMISSION_COUNTER) = MsgA maximum transmission times + 1 for the slice;

4-step slice-specific RACH resources for slices are not configured;

2-step slice-specific RACH and 4-step common RACH configure the same preamble group (for example, both configure preamble group A and preamble group B, and/or, preamble group A and preamble group B have the same selection threshold);

The preamble groups configured for 2-step slice-specific RACH and 4-step slice-specific RACH are different (for example, preamble group A and preamble group B are not both configured, and/or, the selection thresholds of preamble group A and preamble group B are different ).

For example, when the maximum number of transmissions of MsgA for a slice is configured, and 4-step slice-specific RACH resources are not configured, when the UE's 2-step slice-specific RACH reaches the maximum number of transmissions, the UE falls back to 4-step common RACH.

4. The UE performs subsequent RACH procedures.

It can be seen that this application example provides details on how to fall back to 4-step common RACH.

Application example two

In this application example, after falling back from the first random access process (two-step random access process for slices, 2-step slice-specific RACH) to the second random access process (four-step general random access process, In the case of a four-step random access process for general resources or a four-step random access process for slices, 4-step common RACH or 4-step slice-specific RACH), the third random access process in the second random access process is obtained MAC PDU of step message (Msg 3MAC PDU).

Referring to Figure 7, the specific implementation process of this application example is as follows:

b. The RACH resources for slices may be RACH resources for slice groups.

Among them, optionally, all slices belonging to the same slice group use the same RACH resource

3. When performing RACH fallback or handover, the UE obtains the Msg3MAC PDU. Specifically, refer to one or more of the following implementation details:

a. Obtain the MAC PDU (MsgA MAC PDU) of message A from the message A buffer (MsgA buffer).

b. Optionally, when selecting the preamble group for the 4step RACH, select the same preamble group as the 2-step RACH.

For example, group A is selected for 2-step slice-specific RACH, and group A is also selected for 4-step common RACH.

c. Optionally, under the second condition, save the MsgA MAC PDU in the third step message buffer (Msg3buffer), that is to say, Msg3MAC PDU is MsgA MAC PDU.

Wherein, the second condition includes at least one of the following:

2-step slice-specific RACH and 4-step common RACH configure the same preamble group (for example, both configure preamble group A and preamble group B, for example, both configure only preamble group A or preamble group B);

2-step slice-specific RACH and 4-step common RACH configure the same preamble group selection threshold (for example, 2-step slice-specific RACH and 4-step common RACH have the same selection threshold for preamble group A and preamble group B);

2-step slice-specific RACH and 4-step slice-specific RACH configure the same preamble group (for example, both configure preamble group A and preamble group B, for example, both configure only preamble group A or preamble group B;

2-step slice-specific RACH and 4-step slice-specific RACH configure the same preamble group selection threshold (for example, 2-step slice-specific RACH and 4-step slice-specific RACH select preamble group A and preamble group B same threshold);

The grant size of Msg3 is the same as the MsgA MAC PDU size.

d. Optionally, under the third condition, the MsgA MAC PDU is reassembled, and the reassembled MAC PDU is stored in the Msg3buffer, that is to say, the Msg3MAC PDU is the MAC PDU of the MsgA MAC PDU reassembled packet.

Among them, the third condition includes at least one of the following:

2-step slice-specific RACH and 4-step common RACH configure different preamble groups (for example, preamble group A and preamble group B are not both configured);

2-step slice-specific RACH and 4-step common RACH have different preamble selection thresholds (for example, 2-step slice-specific RACH and 4-step common RACH have different selection thresholds for preamble group A and preamble group B);

The preamble groups configured by 2-step slice-specific RACH and 4-step slice-specific RACH are different (for example, preamble group A and preamble group B are not both configured);

2-step slice-specific RACH and 4-step slice-specific RACH configure different preamble group selection thresholds (for example, 2-step slice-specific RACH and 4-step slice-specific RACH select preamble group A and preamble group B different thresholds);

Msg3grant size is different from MsgA MAC PDU size.

Among them, regarding the reorganization package, optional:

How to reassemble the packet may depend on UE implementation;

When reassembling packets, prioritize (multiplex) high-priority data and/or high-priority MAC CE (according to LCP priority);

When reorganizing packages, multiplex data is prioritized

When repackaging, if the resource size is larger than the MsgA grant size, fill the remaining space with 0, or multiplex new data.

4. The UE performs subsequent RACH procedures.

It can be seen that this application example provides how to obtain the Msg3MAC PDU.

Application example three

In this application example, in the case of RACH fallback, if the fourth condition is satisfied, the UE stops the current RACH transmission, or the UE stops the RACH fallback/handover, or the UE considers that the RACH process fails.

b. The RACH resources for slices may be RACH resources for slice groups.

3. In the case of slice-based RACH fallback, if the fourth condition is satisfied, the UE stops the current RACH transmission, or the UE stops the RACH fallback/handover, or the UE considers that the RACH process fails. specific:

a. Obtain the MAC PDU (MsgA MAC PDU) of message A from the message A buffer (MsgA buffer);

b. When the fourth condition is satisfied, the UE stops the current RACH transmission, or the UE stops the RACH fallback/handover, or the UE considers that the RACH procedure fails.

The fourth condition is at least one of the following:

Msg3grant size is different from MsgA MAC PDU size.

It can be seen that this application example provides a way to stop RACH or stop RACH fallback.

Application example four

In this application example, when the maximum number of transmissions for the slice-specific random access procedure is configured, the UE performs the transition from the 2-step slice-specific RACH to the slice-specific RACH based on the number of transmissions. The fallback or switching of the four-step random access process (4-step slice-specific RACH).

The specific implementation process of this application example is as follows:

b. The RACH resources for slices may be RACH resources for slice groups.

d. The network indicates the first information. The first information is the maximum random access transmission times (MsgA maximum transmission times) for the slice, and this parameter is different from the msgA-TransMax parameter in the aforementioned related art. Optionally, the maximum number of MsgA transmissions for a slice is one of positive integers greater than or equal to 1. Optionally, the maximum number of MsgA transmissions for a slice may be common to the slice, or different for different slices.

3. When the number of preamble transmissions (PREAMBLE_TRANSMISSION_COUNTER) reaches the maximum number of MsgA transmissions for the slice, the UE performs fallback or switching from 2-step slice-specific RACH to 4-step slice-specific RACH.

4. The UE performs subsequent RACH procedures.

Application example five

In this application example, in the case where the maximum number of transmissions for the slice-specific random access procedure is not configured, the UE performs a 2-step slice-specific random access procedure (2-step slice-specific RACH) to a four-step random access procedure (4-step slice-specific RACH or 4-step common RACH) fallback or handover.

The specific implementation process of this application example is as follows:

b. The RACH resources for slices may be RACH resources for slice groups.

d. The network is only configured with msgA-TransMax, and the maximum number of random access transmissions for slices (the maximum number of transmissions of MsgA) is not configured.

3. When the number of preamble transmissions (PREAMBLE_TRANSMISSION_COUNTER) reaches msgA-TransMax, the UE performs fallback or switching from 2-step slice-specific RACH to 4-step slice-specific RACH or 4-step common RACH.

4. The UE performs subsequent RACH procedures.

Application example six

The specific implementation process of this application example is as follows:

b. The RACH resources for slices may be RACH resources for slice groups.

f. The network indicates that the configured msgA-TransMax is used or can also be used to perform random access fallback for slices.

4. The UE performs subsequent RACH procedures.

Application Example 7

In this example, the slice-specific UE capability is added, which belongs to optional features without UE radio access capability parameters (optional features without UE radio access capability parameters). It should be noted that the solution for introducing this capability provided in this application example can be implemented in combination with the aforementioned methods, or can be implemented independently. Optionally, this capability is introduced separately for the cell reselection of the slice and the RACH of the slice.

Among them, for sliced RACH, the ability to support RACH partitioning (RACH partitioning), the ability to support RACH fallback (RACH fallback), the ability to support RACH prioritization (RACH prioritization), and the ability to support slice-based RACH processes can be further introduced. Capability, at least one of slice-based RACH resource selection capability. That is, at least one of them is an independent capability or an overall capability.

Optionally, for slice cell reselection, a capability of slice frequency priority and/or frequency sub priority is introduced.

For example, in a trait for slices introduce:

Application example eight

In this example, the UE capability for the slice is added, and the capability belongs to UE radio access capability parameters (UE radio access capability parameters). It should be noted that the solution for introducing this capability provided in this application example can be implemented in combination with the aforementioned methods, or can be implemented independently.

Optionally, the cell reselection for the slice and/or the RACH for the slice respectively introduce this capability.

Wherein, for slice cell reselection, the capability of frequency point priority and/or frequency point sub priority for slice is introduced. That is, at least one of them is an independent ability, or an overall ability.

Among them, for sliced RACH, at least one of the ability to support RACH partitioning, the ability to support RACH fallback, the ability to support RACH prioritization, the ability to support slice-based RACH processes, and the ability to support slice-based RACH resource selection can be further introduced. one. That is, at least one of them is an independent capability or an overall capability.

Optionally, the capability is whether the UE supports receiving slice-related information in dedicated RRC, such as RRCrelease. Optionally, the slice-related information may be slice-specific cell selection information, and/or slice-specific cell reselection information, and/or slice-specific RACH information, such as slice-based RACH fallback, Slice-based RACH selection, slice-based RA priority parameter selection, slice-based RACH process, and the aforementioned maximum number of transmissions, etc.

For example, the capability is whether the UE supports receiving the reselection priority and/or sub-priority for the slice in dedicated RRC, such as RRCelelease.

Optionally, this capability is based on UE or BC (band combination, band combination).

Optional, the capability is optional.

Optionally, this capability does not distinguish FDD (Frequency Division Duplexing, frequency division duplexing) and TDD (Time Division Duplexing, time division duplexing), or, distinguishes FDD-TDD.

Optionally, the capability does not distinguish frequency bands or distinguishes frequency bands, for example, does not distinguish between FR1 and FR2, or distinguishes between FR1 and FR2.

For example, the introduction of physical layer parameters (Physical layer parameters) in UE wireless access capability parameters:

The above describes the specific configuration and implementation of the embodiments of the present application from different perspectives through multiple embodiments. Using at least one of the above embodiments, whether the terminal device performs a fallback from the first random access procedure to the second random access procedure is based on whether the network device supports or instructs the terminal device to perform a fallback to the second random access procedure Determined, or based on whether the network device supports or instructs the terminal device to perform fallback to other random access procedures. In this way, the terminal device can correctly implement the rollback of the random access procedure.

Corresponding to the processing method in at least one of the foregoing embodiments, this embodiment of the present application further provides a terminal device 100, referring to FIG. 8 , which includes:

The first processing module 110 is configured to determine whether to perform a fallback from the first random access procedure to the second random access procedure based on the first information sent by the network device;

Wherein, the first information is used to indicate whether to support or perform a rollback from the first random access procedure to the second random access procedure, or to indicate whether to support or perform a rollback from the first random access procedure to the second random access procedure. Rollback from the random access procedure to the third random access procedure.

Optionally, the first random access procedure includes a slice-specific random access procedure.

Optionally, the second random access procedure includes a random access procedure for non-slicing, or a random access procedure for general resources, or a general random access procedure.

Optionally, the third random access procedure includes a random access procedure for slices.

Optionally, the first random access procedure includes a two-step random access procedure for slices, and the third random access procedure includes a four-step random access procedure for slices.

Optionally, the second random access procedure includes a four-step random access procedure for non-slicing, or a four-step random access procedure for common resources, or a four-step universal random access procedure.

Optionally, the first information includes maximum number of transmissions and/or resources for a random access procedure.

Optionally, when the first information includes the maximum number of transmissions for the second random access procedure, and/or the first information does not include the maximum number of transmissions for the third random access procedure, And/or, when the maximum number of transmissions for the second random access procedure in the first information is greater than or equal to 1, the first information is used to indicate that the terminal device is supported to execute A fallback from a random access procedure to the second random access procedure.

Optionally, when the first information includes the maximum number of transmissions for the third random access procedure, and/or the first information does not include the maximum number of transmissions for the second random access procedure, And/or, when the maximum number of transmissions for the third random access procedure in the first information is greater than or equal to 1, the first information is used to indicate that the terminal device is supported to perform The rollback from the random access procedure to the third random access procedure.

Optionally, the first information includes a maximum number of transmissions for the third random access procedure, and/or, the maximum number of transmissions for the third random access procedure in the first information is greater than In the case of being equal to 1, if the first information does not include resources for the third random access procedure, the first information is used to indicate that the terminal device is supported to perform the resource from the first random access procedure A fallback to the second random access procedure.

Optionally, the first information includes a maximum number of transmissions for the third random access procedure, and/or, the maximum number of transmissions for the third random access procedure in the first information is greater than When it is equal to 1, if the first information includes resources for the second random access procedure, the first information is used to indicate that the terminal device is supported to perform the process from the first random access procedure to Rollback of the second random access procedure.

Optionally, the first information corresponds to one of the multiple slices, and the first information is applicable to the corresponding slice.

Optionally, the first information corresponds to one slice group in the multiple slice groups, and the first information is applicable to multiple slices in the corresponding slice group.

Optionally, the first information is applicable to multiple slices or multiple slice groups.

Optionally, the first processing module 110 is configured to:

In a case where it is determined based on the first information that the first condition is satisfied, performing a rollback from the first random access procedure to the second random access procedure.

Optionally, the first processing module 110 is configured to:

If it is determined based on the first information that the first condition is satisfied, no rollback from the first random access procedure to the third random access procedure is performed.

Optionally, the first processing module 110 is configured to:

If it is determined based on the first information that the first condition is not satisfied, no rollback from the first random access procedure to the second random access procedure is performed.

Optionally, the first processing module 110 is configured to:

In a case where it is determined based on the first information that the first condition is not met, performing a fallback from the first random access procedure to the third random access procedure.

Optionally, the first processing module 110 is further configured to:

The preamble group configured in the first random access procedure is different from the preamble group configured in the second random access procedure, or the preamble group selection threshold configured in the first random access procedure is different from that configured in the second random access procedure If the preamble group selection thresholds configured in the two random access procedures are different, the terminal device falls back to the second random access procedure or determines whether the first condition is met based on the first information;

or,

The preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is different from that configured in the third random access procedure If the preamble group selection thresholds configured by the three random access procedures are different, the terminal device falls back to the second random access procedure or determines whether the first condition is satisfied based on the first information;

or,

The preamble group configured in the first random access procedure is the same as the preamble group configured in the second random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as that configured in the second random access procedure If the preamble group selection thresholds configured in the two random access procedures are the same, the terminal device falls back to the second random access procedure or determines whether the first condition is satisfied based on the first information;

or,

The preamble group configured in the first random access procedure is the same as the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as that configured in the third random access procedure If the preamble group selection thresholds configured by the three random access procedures are the same, the terminal device falls back to the second random access procedure or determines whether the first condition is met based on the first information.

Optionally, the first processing module 110 is further configured to:

The preamble group configured in the first random access procedure is the same as the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as that configured in the third random access procedure In a case where the preamble group selection thresholds configured by the three random access procedures are the same, the terminal device falls back to the third random access procedure.

Optionally, the first condition includes at least one of the following:

receiving the first message;

The first information appears in a first message sent by the network device;

The first information indicates that the terminal device is supported to perform rollback from the first random access procedure to the second random access procedure;

The first information includes a maximum number of transmissions for the second random access procedure;

The first information does not include a maximum number of transmissions for the third random access procedure;

The first information does not include a maximum number of random access transmissions for a slice;

resources for the third random access procedure are not configured;

The first information includes a maximum number of random access transmissions for a slice;

The maximum number of random access transmissions for slices is less than 1;

configuring resources for the second random access procedure;

The use condition of the first information is satisfied.

Optionally, the usage conditions of the first information include at least one of the following:

The number of preamble transmissions of the first random access procedure is greater than the maximum number of random access transmissions for the slice;

resources for the third random access procedure are not configured;

configuring resources for the second random access procedure;

configuring a maximum number of transmissions for the second random access procedure;

The maximum number of transmissions for the third random access procedure is not configured;

The maximum number of random access transmissions for slices is not configured;

Configuring the maximum number of transmissions for the third random access procedure;

Configure the maximum number of random access transmissions for slices;

The maximum number of random access transmissions for the slice or the maximum number of transmissions for the third random access procedure is greater than or equal to 1.

Optionally, the first processing module 110 is further configured to:

In the case of performing a fallback from the first random access procedure to the second random access procedure, the terminal device is based on the medium access control protocol of message A in the first random access procedure The data unit MAC PDU obtains the MAC PDU of the third step message in the second random access process.

Optionally, the first processing module 110 is configured to:

If the second condition is met, the MAC PDU of message A in the first random access process is used as the MAC PDU of the third step message in the second random access process;

and / or,

If the third condition is met, repacking is performed based on the MAC PDU of message A in the first random access process to obtain the MAC PDU in the third step message of the second random access process.

Optionally, in the process of reassembling packets based on the MAC PDU of message A in the first random access process, if the resource size of the third step message in the second random access process is larger than the first A grant size of message A in the random access process, the terminal device fills the remaining space of the PDU based on preset bits or new data.

Optionally, the first processing module 110 is further configured to:

Obtain the MAC PDU of the message A in the message A buffer.

Optionally, the first processing module 110 is further configured to:

The MAC PDU of the third step message in the second random access process obtained based on the MAC PDU of message A in the first random access process is stored in the third step message buffer.

Optionally, the first processing module 110 is further configured to:

In the case of performing a fallback from the first random access procedure to the third random access procedure, the terminal device is based on the medium access control protocol of message A in the first random access procedure The data unit MAC PDU is to obtain the MAC PDU of the third step message in the third random access process.

Optionally, the first processing module 110 is specifically configured to:

If the second condition is met, the MAC PDU of message A in the first random access process is used as the MAC PDU of the third step message in the third random access process;

and / or,

If the third condition is met, repacking is performed based on the MAC PDU of message A in the first random access process, to obtain the MAC PDU of the third step message in the third random access process.

Optionally, in the process of reassembling packets based on the MAC PDU of message A in the first random access process, if the resource size of the third step message in the third random access process is larger than the first A grant size of message A in the random access process, the terminal device fills the remaining space of the PDU based on preset bits or new data.

Optionally, the first processing module 110 is further configured to:

Obtain the MAC PDU of the message A in the message A buffer.

Optionally, the first processing module 110 is further configured to:

The MAC PDU of the third step message in the third random access process obtained based on the MAC PDU of message A in the first random access process is stored in the third step message buffer.

Optionally, the second condition includes at least one of the following:

Therefore, the authorization size of the third step message in the second random access procedure is the same as the MAC PDU size of the message A in the first random access procedure;

Therefore, the grant size of the third-step message in the third random access procedure is the same as the MAC PDU size of message A in the first random access procedure.

Optionally, the third condition includes at least one of the following:

Therefore, the authorization size of the third step message in the second random access procedure is different from the MAC PDU size of message A in the first random access procedure;

Optionally, in the process of reassembling packets based on the MAC PDU of message A in the first random access process, the terminal device multiplexes the data and/or the MAC CE.

Optionally, in the process of reassembling packets based on the MAC PDU of message A in the first random access process, the terminal device preferentially multiplexes data.

Optionally, the first processing module 110 is further configured to:

If the fourth condition is met, the terminal device stops random access, stops performing rollback from the first random access procedure to the second random access procedure, or determines that random access fails.

Optionally, the first processing module 110 is further configured to:

When the fourth condition is met, the terminal device stops random access, stops performing rollback from the first random access procedure to the third random access procedure, or determines that random access fails.

Optionally, the fourth condition includes:

Optionally, the first processing module 110 is further configured to:

Acquire random access resources based on resource configuration information sent by the network device; where the random access resources include general random access resources and/or slice-specific random access resources.

Optionally, the first processing module 110 is further configured to:

In case the random access resources do not include random access resources for slices, a random access procedure is performed using general random access resources.

Optionally, the first processing module 110 is further configured to: if the slice information triggering random access is the first slice, determine the slice group to which the first slice belongs based on the mapping relationship between slices and slice groups , and perform random access based on the random access resource corresponding to the slice group.

Optionally, the first processing module 110 is further configured to: in the case that the random access resource for a slice configured in the resource configuration information is applicable to its corresponding slice group, if the slice that triggers random access If the information is the first slice, the slice group to which the first slice belongs is determined based on the mapping relationship between the slice and the slice group, and random access is performed based on the random access resource corresponding to the slice group.

Optionally, the first processing module 110 is further configured to: in the case that the random access resource for a slice configured in the resource configuration information is applicable to its corresponding slice group, if the slice that triggers random access If the information is the first slice group, the terminal device performs random access based on the random access resource corresponding to the first slice group.

Optionally, the resource configuration information is included in a system information block (SIB) and/or radio resource control (RRC) signaling.

Optionally, the first processing module 110 is further configured to:

The first random access procedure is performed based on the slice-specific random access resources.

Optionally, the first processing module 110 is further configured to: obtain slice-specific cell reselection information configured by the network device; wherein, the slice-specific cell reselection information is applicable to its corresponding slice or corresponding slice group.

Optionally, the method also includes:

Optionally, the first processing module 110 is further configured to: in the case that the cell reselection information for a slice is applicable to its corresponding slice group, if the slice information triggering cell reselection is the second slice, then Determining the slice group described in the second slice based on the mapping relationship between the slice and the slice group, and performing cell reselection based on the cell reselection information corresponding to the slice group.

Optionally, the first processing module 110 is further configured to: in the case that the cell reselection information for a slice is applicable to its corresponding slice group, if the slice information triggering cell reselection is the second slice group, Then perform cell reselection based on the cell reselection information corresponding to the second slice group.

Optionally, the first processing module 110 is further configured to: in the case that the cell reselection information for a slice is applicable to its corresponding slice, if the slice information triggering cell reselection is the second slice, then based on The cell reselection information corresponding to the second slice performs cell reselection.

Optionally, the first processing module 110 is further configured to: in the case that the cell reselection information for a slice is applicable to its corresponding slice, if the slice information triggering cell reselection is the second slice group, then Based on the mapping relationship between slices and slice groups, determine a second slice in the second slice group, and perform cell reselection based on cell reselection information corresponding to the second slice.

Exemplarily, the terminal device may randomly select a slice in the second slice group as the second slice, or select the slice at the first position in the group as the second slice, or select the slice with the highest priority in the group as the second slice. The second slice, or select the slice at the last position in the group as the second slice, or select the slice with the lowest priority in the group as the second slice, or select the slice with the smallest slice identifier in the group as the second slice, Or select the slice with the largest slice ID in the group as the second slice.

Optionally, when the slice supported by the cell is the same as the slice supported by the serving frequency point, the cell reselection information for the slice includes the frequency point of the cell corresponding to the slice. That is to say, when indicating supported slices, only the frequency points corresponding to the cell may be indicated without indicating the identifier or PCI of the cell.

Optionally, when the slice supported by the cell is different from the slice supported by the service frequency point, the cell reselection information for the slice includes the frequency point of the cell corresponding to the slice and the cell identity CI or physical cell identity corresponding to the slice PCI. Alternatively, the cell reselection information for a slice includes a cell identity CI or PCI corresponding to the cell, a frequency point corresponding to the cell, and slice information supported by the cell. Alternatively, the slice-specific cell reselection information includes a cell identity CI or PCI corresponding to the cell and slice information supported by the cell. Wherein, the slice information includes at least one of a slice identifier, a slice group identifier, and a frequency point priority corresponding to the slice.

Optionally, the first processing module 110 is further configured to: acquire slice-specific cell selection information configured by the network device; wherein, the slice-specific cell selection information is applicable to its corresponding slice or corresponding slice group .

Optionally, the method also includes:

If the slice information that triggers cell selection is the third slice, the terminal device determines the slice group to which the third slice belongs based on the mapping relationship between slices and slice groups, and performs cell selection based on the cell selection information corresponding to the slice group. Cell selection.

Optionally, the first processing module 110 is further configured to: in the case that the cell selection information for a slice is applicable to its corresponding slice group, if the slice information triggering the cell selection is the third slice, then based on the slice The mapping relationship with the slice group determines the slice group described in the third slice, and performs cell selection based on the cell selection information corresponding to the slice group.

Optionally, the first processing module 110 is further configured to: in the case that the cell selection information for a slice is applicable to its corresponding slice group, if the slice information triggering cell selection is the third slice group, then based on The cell selection information corresponding to the third slice group performs cell selection.

Optionally, the first processing module 110 is further configured to: in the case that the cell selection information for a slice is applicable to its corresponding slice, if the slice information triggering the cell selection is the third slice, based on the The cell selection information corresponding to the third slice performs cell selection.

Optionally, the first processing module 110 is further configured to: in the case that the cell selection information for a slice is applicable to its corresponding slice, if the slice information triggering the cell selection is the third slice group, then based on the slice For the mapping relationship with the slice group, determine the third slice in the third slice group, and perform cell selection based on the cell selection information corresponding to the third slice.

Optionally, when the slice supported by the cell is the same as the slice supported by the serving cell, the cell selection information for the slice includes a frequency point of the cell corresponding to the slice. That is to say, when indicating supported slices, only the frequency points corresponding to the cell may be indicated without indicating the identifier or PCI of the cell.

Optionally, when the slice supported by the cell is different from the slice supported by the serving cell, the cell selection information for the slice includes the frequency point of the cell corresponding to the slice and the cell identity CI or physical cell identity PCI corresponding to the slice.

Optionally, the first processing module 110 is further configured to:

If it is determined that random access resources for slices are not configured, the access layer of the terminal device sends second information to the non-access layer of the terminal device, where the second information is used to indicate that the non-access The access layer does not send slice information to the access layer.

The terminal device 100 in the embodiment of the present application can realize the corresponding functions of the terminal device in the foregoing method embodiments, and the corresponding processes, functions, implementation methods and benefits of each module (submodule, unit or component, etc.) in the terminal device 100 For effects, refer to the corresponding descriptions in the foregoing method embodiments, and details are not repeated here. It should be noted that the functions described by the various modules (submodules, units or components, etc.) in the terminal device 100 in the embodiment of the present application may be implemented by different modules (submodules, units or components, etc.), or may be implemented by the same One module (submodule, unit or component, etc.) realizes, for example, the first sending module and the second sending module can be different modules, also can be the same module, all can realize its in the embodiment of the present application corresponding function. In addition, the communication module in the embodiment of the present application may be implemented by a transceiver of the device, and part or all of the other modules may be implemented by a processor of the device.

Fig. 9 is a schematic block diagram of a network device 200 according to an embodiment of the present application. The network device 200 may include:

The first communication module 210 is configured to send first information to the terminal device, so that the terminal device determines whether to perform a rollback from the first random access procedure to the second random access procedure based on the first information;

Optionally, the first communication module 210 is specifically configured to:

The preamble group configured in the first random access procedure is different from the preamble group configured in the second random access procedure, or the preamble group selection threshold configured in the first random access procedure is different from that configured in the second random access procedure. If the preamble group selection thresholds configured in the random access process are different, sending the first information to the terminal device;

or,

The preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is different from that configured in the third random access procedure. Sending the first information to the terminal device when the preamble group selection thresholds configured in the entry process are different;

or,

The preamble group configured in the first random access procedure is the same as the preamble group configured in the second random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as that configured in the second random access procedure. When the preamble group selection thresholds configured in the random access process are the same, sending the first information to the terminal device;

or,

The preamble group configured in the first random access procedure is the same as the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as that configured in the third random access procedure. If the preamble group selection thresholds configured in the random access procedure are the same, the first information is sent to the terminal device.

Optionally, the first communication module 210 is also used for:

Send resource configuration information to the terminal device, where the resource configuration information is used to indicate random access resources, where the random access resources include general random access resources and/or slice-specific random access resources.

Optionally, the first communication module 210 is further configured to: send cell reselection information for a slice to the terminal device; wherein the cell reselection information for a slice is applicable to a corresponding slice or a corresponding slice group.

Optionally, when the slice supported by the cell is the same as the slice supported by the serving frequency point, the cell reselection information for the slice includes the frequency point of the cell corresponding to the slice.

Optionally, when the slice supported by the cell is different from the slice supported by the service frequency point, the cell reselection information for the slice includes the frequency point of the cell corresponding to the slice and the cell identity CI or physical cell identity corresponding to the slice PCI.

Optionally, the first communication module 210 is further configured to: send slice-specific cell selection information to the terminal device; wherein the slice-specific cell selection information is applicable to a corresponding slice or a corresponding slice group.

Optionally, when the slice supported by the cell is the same as the slice supported by the serving frequency point, the cell selection information for the slice includes the frequency point of the cell corresponding to the slice.

Optionally, when the slice supported by the cell is different from the slice supported by the service frequency point, the cell selection information for the slice includes the frequency point of the cell corresponding to the slice and the cell identity CI or physical cell identity PCI corresponding to the slice .

The network device 200 in the embodiment of the present application can implement the corresponding functions of the network device in the foregoing method embodiments. For the processes, functions, implementations and beneficial effects corresponding to each module (submodule, unit or component, etc.) in the network device 200, refer to the corresponding description in the above method embodiment, and details are not repeated here. It should be noted that the functions described by the modules (submodules, units or components, etc.) in the network device 200 of the embodiment of the application can be realized by different modules (submodules, units or components, etc.), or by the same module (submodule, unit or component, etc.), for example, the first sending module and the second sending module can be different modules, or the same module, all of which can realize their corresponding functions in the embodiments of the present application. Function. In addition, the communication module in the embodiment of the present application may be implemented by a transceiver of the device, and part or all of the other modules may be implemented by a processor of the device.

Fig. 10 is a schematic structural diagram of a communication device 600 according to an embodiment of the application, wherein the communication device 600 includes a processor 610, and the processor 610 can call and run a computer program from a memory to implement the method in the embodiment of the application.

Optionally, the communication device 600 may further include a memory 620 . Wherein, the processor 610 can invoke and run a computer program from the memory 620, so as to implement the method in the embodiment of the present application.

Wherein, the memory 620 may be an independent device independent of the processor 610 , or may be integrated in the processor 610 .

Optionally, the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices, specifically, to send information or data to other devices, or to receive information or data sent by other devices .

Wherein, the transceiver 630 may include a transmitter and a receiver. The transceiver 630 may further include antennas, and the number of antennas may be one or more.

Optionally, the communication device 600 may be the network device of the embodiment of the present application, and the communication device 600 may implement the corresponding processes implemented by the network device in the methods of the embodiment of the present application. For the sake of brevity, details are not repeated here.

Optionally, the communication device 600 may be the terminal device of the embodiment of the present application, and the communication device 600 may implement the corresponding processes implemented by the terminal device in the methods of the embodiment of the present application. For the sake of brevity, details are not repeated here.

Fig. 11 is a schematic structural diagram of a chip 700 according to an embodiment of the present application, wherein the chip 700 includes a processor 710, and the processor 710 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, the chip 700 may further include a memory 720 . Wherein, the processor 710 can invoke and run a computer program from the memory 720, so as to implement the method in the embodiment of the present application.

Wherein, the memory 720 may be an independent device independent of the processor 710 , or may be integrated in the processor 710 .

Optionally, the chip 700 may also include an input interface 730 . Wherein, the processor 710 can control the input interface 730 to communicate with other devices or chips, specifically, can obtain information or data sent by other devices or chips.

Optionally, the chip 700 may also include an output interface 740 . Wherein, the processor 710 can control the output interface 740 to communicate with other devices or chips, specifically, can output information or data to other devices or chips.

Optionally, the chip can be applied to the network device in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the network device in the methods of the embodiment of the present application. For the sake of brevity, details are not repeated here.

Optionally, the chip can be applied to the terminal device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the terminal device in the methods of the embodiments of the present application. For the sake of brevity, details are not repeated here.

It should be understood that the chip mentioned in the embodiment of the present application may also be called a system-on-chip, a system-on-chip, a system-on-a-chip, or a system-on-a-chip.

The processor mentioned above can be a general-purpose processor, a digital signal processor (DSP), an off-the-shelf programmable gate array (FPGA), an application specific integrated circuit (ASIC) or Other programmable logic devices, transistor logic devices, discrete hardware components, etc. Wherein, the general-purpose processor mentioned above may be a microprocessor or any conventional processor or the like.

The aforementioned memories may be volatile memories or nonvolatile memories, or may include both volatile and nonvolatile memories. Among them, the non-volatile memory can be read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically programmable Erases programmable read-only memory (electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (RAM).

It should be understood that the above-mentioned memory is illustrative but not restrictive. For example, the memory in the embodiment of the present application may also be a static random access memory (static RAM, SRAM), a dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is, the memories in the embodiments of the present application are intended to include, but are not limited to, these and any other suitable types of memories.

FIG. 12 is a schematic block diagram of a communication system 800 according to an embodiment of the present application. The communication system 800 includes a terminal device 810 and a network device 820 .

Wherein, the terminal device 810 can be used to realize the corresponding functions realized by the terminal device in the methods of the various embodiments of the present application, and the network device 820 can be used to realize the corresponding functions realized by the network device in the methods of the various embodiments of the present application function. For the sake of brevity, details are not repeated here.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transferred from a website, computer, server, or data center by wire (such as coaxial cable, optical fiber, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (such as infrared, wireless, microwave, etc.) to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, and should not be used in the embodiments of the present application. The implementation process constitutes any limitation.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

The above is only the specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application, and should covered within the scope of protection of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

A random access method, comprising:

The terminal device determines whether to perform a fallback from the first random access procedure to the second random access procedure based on the first information sent by the network device;

Wherein, the first information is used to indicate whether to support or perform a rollback from the first random access procedure to the second random access procedure, or to indicate whether to support or perform a rollback from the first random access procedure to the second random access procedure. Rollback from the random access procedure to the third random access procedure.
The method of claim 1, wherein the first random access procedure comprises a slice-specific random access procedure.
The method according to claim 1 or 2, wherein the second random access procedure comprises a random access procedure for non-slicing, or a random access procedure for general resources, or a general random access procedure.
The method according to any one of claims 1-3, wherein the third random access procedure comprises a slice-specific random access procedure.
The method according to any one of claims 1-4, wherein the first random access procedure comprises a two-step random access procedure for a slice, and the third random access procedure comprises a four-step random access procedure for a slice random access process.
The method according to any one of claims 1-5, wherein the second random access procedure comprises a four-step random access procedure for non-slicing, or a four-step random access procedure for general resources, Or, a four-step universal random access procedure.
The method according to any one of claims 1-6, wherein the first information includes a maximum number of transmissions and/or resources for a random access procedure.
The method according to claim 7, wherein the first information includes the maximum number of transmissions for the second random access procedure, and/or the first information does not include the maximum number of transmissions for the third random access procedure. access procedure, and/or, in the case where the maximum number of transmissions for the second random access procedure in the first information is greater than or equal to 1, the first information is used to indicate that the terminal is supported The device performs a fallback from the first random access procedure to the second random access procedure.
The method according to claim 7, wherein the first information includes the maximum number of transmissions for the third random access procedure, and/or the first information does not include the maximum number of transmissions for the second random access procedure access procedure, and/or, when the maximum number of transmission times for the third random access procedure in the first information is greater than or equal to 1, the first information is used to indicate that the terminal is supported The device performs a fallback from the first random access procedure to the third random access procedure.
The method according to claim 7, wherein the first information includes the maximum number of transmissions for the third random access procedure, and/or, the maximum number of transmissions for the third random access procedure in the first information In the case where the maximum number of transmissions of the access procedure is greater than or equal to 1, if the first information does not include resources for the third random access procedure, the first information is used to indicate that the terminal device is supported to perform Rollback from the first random access procedure to the second random access procedure.
The method according to claim 7, wherein the first information includes the maximum number of transmissions for the third random access procedure, and/or, the maximum number of transmissions for the third random access procedure in the first information In the case where the maximum number of transmissions of the access procedure is greater than or equal to 1, if the first information includes resources for the second random access procedure, the first information is used to indicate that the terminal device is supported to perform Rollback from the first random access procedure to the second random access procedure.
The method according to claim 7, wherein the first information includes the maximum number of transmissions for the second random access procedure, and the first information indicates the number of transmissions for the second random access procedure If the maximum number of transmissions is not used in the third random access procedure, the terminal device performs a fallback from the first random access procedure to the second random access procedure, or the terminal device does not perform A fallback from the first random access procedure to the third random access procedure, or, the terminal device does not perform a fallback from the first random access procedure.
The method according to claim 7, wherein the first information includes the maximum number of transmissions for the second random access procedure, and the first information indicates the number of transmissions for the second random access procedure In a case where the maximum number of transmissions is not used to fall back to the third random access procedure, the terminal device performs a fallback from the first random access procedure to the second random access procedure, or, the The terminal device does not perform the fallback from the first random access procedure to the third random access procedure, or the terminal device does not perform the fallback from the first random access procedure.
The method according to claim 7, wherein the first information includes a maximum number of transmissions for a random access procedure, and the first information indicates that the maximum number of transmissions for a random access procedure is not used for the In the case of the third random access procedure, the terminal device performs a fallback from the first random access procedure to the second random access procedure, or the terminal device does not perform the fallback from the second random access procedure A fallback from a random access procedure to the third random access procedure, or, the terminal device does not perform a fallback from the first random access procedure.
The method according to claim 7, wherein the first information includes a maximum number of transmissions for a random access procedure, and the first information indicates that the maximum number of transmissions for a random access procedure is also used for In the case of the third random access procedure, the terminal device performs a fallback from the first random access procedure to the third random access procedure, or, the terminal device performs a rollback from the first random access procedure A fallback of the random access procedure.
The method according to claim 7, wherein the first information includes the maximum number of transmissions for the second random access procedure, and the first information indicates that the maximum number of transmissions for the random access procedure is also In the case of falling back to the third random access procedure, the terminal device performs a fallback from the first random access procedure to the third random access procedure, or, the terminal device A fallback from said first random access procedure is performed.
The method according to any one of claims 1-16, wherein the first information corresponds to one of the plurality of slices, and the first information is applicable to its corresponding slice.
The method according to any one of claims 1-16, wherein the first information corresponds to one slice group in a plurality of slice groups, and the first information is applicable to a plurality of slice groups in the corresponding slice group. slice.
The method according to any one of claims 1-16, the first information applies to multiple slices or multiple slice groups.
The method according to any one of claims 1-19, wherein the terminal device determines whether to perform a fallback from the first random access procedure to the second random access procedure based on the first information sent by the network device ,include:

The terminal device executes rollback from the first random access procedure to the second random access procedure when it is determined based on the first information that the first condition is met.
The method according to any one of claims 1-20, wherein the method further comprises:

In a case where the terminal device determines that the first condition is met based on the first information, the terminal device does not perform a fallback from the first random access procedure to the third random access procedure.
The method according to any one of claims 1-21, wherein the terminal device determines whether to perform a fallback from the first random access procedure to the second random access procedure based on the first information sent by the network device ,include:

In a case where the terminal device determines based on the first information that the first condition is not satisfied, the terminal device does not perform a fallback from the first random access procedure to the second random access procedure.
The method according to any one of claims 1-22, wherein the method further comprises:

The terminal device executes fallback from the first random access procedure to the third random access procedure when it is determined based on the first information that the first condition is not met.
The method according to any one of claims 20-23, wherein the method further comprises:

The preamble group configured in the first random access procedure is different from the preamble group configured in the second random access procedure, or the preamble group selection threshold configured in the first random access procedure is different from that configured in the second random access procedure If the preamble group selection thresholds configured in the two random access procedures are different, the terminal device falls back to the second random access procedure or determines whether the first condition is met based on the first information;

or,

The preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is different from that configured in the third random access procedure If the preamble group selection thresholds configured by the three random access procedures are different, the terminal device falls back to the second random access procedure or determines whether the first condition is satisfied based on the first information;

or,

The preamble group configured in the first random access procedure is the same as the preamble group configured in the second random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as that configured in the second random access procedure If the preamble group selection thresholds configured in the two random access procedures are the same, the terminal device falls back to the second random access procedure or determines whether the first condition is satisfied based on the first information;

or,

The preamble group configured in the first random access procedure is the same as the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as that configured in the third random access procedure If the preamble group selection thresholds configured by the three random access procedures are the same, the terminal device falls back to the second random access procedure or determines whether the first condition is met based on the first information.
The method according to any one of claims 1-24, wherein the method further comprises:

The preamble group configured in the first random access procedure is the same as the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as that configured in the third random access procedure In a case where the preamble group selection thresholds configured by the three random access procedures are the same, the terminal device falls back to the third random access procedure.
The method according to any one of claims 20-24, wherein the first condition comprises at least one of the following:

receiving the first message;

The first information appears in a first message sent by the network device;

The first information indicates that the terminal device is supported to perform rollback from the first random access procedure to the second random access procedure;

The first information includes a maximum number of transmissions for the second random access procedure;

The first information does not include a maximum number of transmissions for the third random access procedure;

The first information does not include a maximum number of random access transmissions for a slice;

resources for the third random access procedure are not configured;

The first information includes a maximum number of random access transmissions for a slice;

The maximum number of random access transmissions for slices is less than 1;

configuring resources for the second random access procedure;

The use condition of the first information is met.
The method according to claim 26, wherein the usage conditions of the first information include at least one of the following:

The number of preamble transmissions of the first random access procedure is greater than the maximum number of random access transmissions for the slice;

resources for the third random access procedure are not configured;

The preamble group configured in the first random access procedure is the same as the preamble group configured in the second random access procedure;

The preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure;

configuring resources for the second random access procedure;

configuring a maximum number of transmissions for the second random access procedure;

The maximum number of transmissions for the third random access procedure is not configured;

The maximum number of random access transmissions for slices is not configured;

Configuring the maximum number of transmissions for the third random access procedure;

Configure the maximum number of random access transmissions for slices;

The maximum number of random access transmissions for the slice or the maximum number of transmissions for the third random access procedure is greater than or equal to 1.
The method according to any one of claims 1-27, wherein the method further comprises:

In the case of performing a fallback from the first random access procedure to the second random access procedure, the terminal device is based on the medium access control protocol of message A in the first random access procedure The data unit MAC PDU obtains the MAC PDU of the third step message in the second random access process.
The method according to claim 28, wherein the terminal device obtains the MAC PDU of the third step message in the second random access process based on the MAC PDU of message A in the first random access process ,include:

If the second condition is met, the terminal device uses the MAC PDU of message A in the first random access process as the MAC PDU of the third step message in the second random access process;

and / or,

If the third condition is met, the terminal device reassembles the packet based on the MAC PDU of message A in the first random access process, and obtains the MAC PDU in the third step message of the second random access process.
The method according to claim 29, wherein, in the process that the terminal device reassembles packets based on the MAC PDU of message A in the first random access procedure, if the In the third step, the resource size of the message is greater than the grant size of the message A in the first random access procedure, and the terminal device fills the remaining space of the PDU based on preset bits or new data.
The method according to any one of claims 28-30, wherein the terminal device obtains the first random access procedure based on the medium access control protocol data unit MAC PDU of message A in the first random access procedure Before the MAC PDU of the third step message in the random access process, the method also includes:

The terminal device acquires the MAC PDU of the message A in the message A buffer.
The method according to any one of claims 28-31, wherein the method further comprises:

The terminal device saves the MAC PDU of the third-step message in the second random access process obtained based on the MAC PDU of message A in the first random access process in the third-step message buffer.
The method according to any one of claims 1-32, wherein the method further comprises:

In the case of performing a fallback from the first random access procedure to the third random access procedure, the terminal device is based on the medium access control protocol of message A in the first random access procedure The data unit MAC PDU is to obtain the MAC PDU of the third step message in the third random access process.
The method according to claim 33, wherein the terminal device obtains the MAC of the third step message in the third random access process based on the MAC PDU of message A in the first random access process PDUs, including:

If the second condition is met, the terminal device uses the MAC PDU of message A in the first random access process as the MAC PDU of the third step message in the third random access process;

and / or,

If the third condition is met, the terminal device reassembles the packet based on the MAC PDU of message A in the first random access process, and obtains the MAC PDU of the third step message in the third random access process .
The method according to claim 34, wherein, in the process of repackaging based on the MAC PDU of message A in the first random access process, if the third step message in the third random access process If the resource size is greater than the grant size of message A in the first random access procedure, then the terminal device fills the remaining space of the PDU based on preset bits or new data.
The method according to any one of claims 33-35, wherein the terminal device obtains the second random access procedure based on the medium access control protocol data unit MAC PDU of message A in the first random access procedure Before the MAC PDU of the third step message in the three random access procedures, the method further includes:

The terminal device acquires the MAC PDU of the message A in the message A buffer.
The method according to any one of claims 33-36, wherein the method further comprises:

The terminal device saves the MAC PDU of the third-step message in the third random access process obtained based on the MAC PDU of message A in the first random access process in the third-step message buffer.
The method according to any one of claims 29, 30, 34, 35, wherein the second condition comprises at least one of the following:

The preamble group configured in the first random access procedure is the same as the preamble group configured in the second random access procedure;

The preamble group selection threshold configured in the first random access procedure is the same as the preamble group selection threshold configured in the second random access procedure;

Therefore, the authorization size of the third step message in the second random access procedure is the same as the MAC PDU size of the message A in the first random access procedure;

The preamble group configured in the first random access procedure is the same as the preamble group configured in the third random access procedure;

The preamble group selection threshold configured in the first random access procedure is the same as the preamble group selection threshold configured in the third random access procedure;

Therefore, the grant size of the third-step message in the third random access procedure is the same as the MAC PDU size of message A in the first random access procedure.
The method according to any one of claims 29, 30, 34, 35, 38, wherein the third condition comprises at least one of the following:

The preamble group configured in the first random access procedure is different from the preamble group configured in the second random access procedure;

The preamble group selection threshold configured in the first random access procedure is different from the preamble group selection threshold configured in the second random access procedure;

Therefore, the authorization size of the third step message in the second random access procedure is different from the MAC PDU size of message A in the first random access procedure;

The preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure;

The preamble group selection threshold configured in the first random access procedure is different from the preamble group selection threshold configured in the third random access procedure;

Therefore, the authorization size of the third step message in the third random access procedure is different from the MAC PDU size of message A in the first random access procedure.
The method according to any one of claims 29, 30, 34, 35, 38, and 39, wherein, in the process of reassembling packets based on the MAC PDU of message A in the first random access process, the The terminal device multiplexes the data and/or the MAC CE according to the priority of the data and/or the priority of the MAC CE.
The method according to any one of claims 29, 30, 34, 35, 38-40, wherein, in the process of reassembling packets based on the MAC PDU of message A in the first random access process, the The above-mentioned terminal equipment preferentially multiplexes data.
The method according to any one of claims 1-41, wherein the method further comprises:

If the fourth condition is met, the terminal device stops random access, stops performing rollback from the first random access procedure to the second random access procedure, or determines that random access fails.
The method according to any one of claims 1-42, wherein the method further comprises:

When the fourth condition is met, the terminal device stops random access, stops performing rollback from the first random access procedure to the third random access procedure, or determines that random access fails.
The method according to claim 42 or 43, wherein said fourth condition comprises:

The preamble group configured in the first random access procedure is different from the preamble group configured in the second random access procedure;

The preamble group selection threshold configured in the first random access procedure is different from the preamble group selection threshold configured in the second random access procedure;

Therefore, the authorization size of the third step message in the second random access procedure is different from the MAC PDU size of message A in the first random access procedure;

The preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure;

The preamble group selection threshold configured in the first random access procedure is different from the preamble group selection threshold configured in the third random access procedure;

Therefore, the authorization size of the third step message in the third random access procedure is different from the MAC PDU size of message A in the first random access procedure.
The method according to any one of claims 1-44, wherein the method further comprises:

The terminal device acquires random access resources based on the resource configuration information sent by the network device; wherein the random access resources include general random access resources and/or slice-specific random access resources.
The method according to claim 45, wherein said method further comprises:

In the case that the random access resource does not include the random access resource for a slice, the terminal device uses the general random access resource to perform a random access procedure.
The method according to claim 44 or 45, wherein the random access resource for a slice is applicable to its corresponding slice or a plurality of slices in a corresponding slice group.
The method of claim 47, wherein the random access resource for a slice corresponds to at least one slice or at least one slice group.
The method according to claim 47 or 48, wherein each slice or each slice group corresponds to only one random access resource for a slice.
The method according to any one of claims 47-49, wherein the method further comprises:

If the slice information triggering random access is the first slice, the terminal device determines the slice group to which the first slice belongs based on the mapping relationship between the slice and the slice group, and based on the random access corresponding to the slice group, Incoming resources for random access.
The method according to any one of claims 47-49, wherein the method further comprises:

In the case where the random access resource for a slice configured in the resource configuration information is applicable to its corresponding slice group, if the slice information triggering random access is the first slice, the terminal device, based on the slice and The mapping relationship of the slice group determines the slice group to which the first slice belongs, and performs random access based on the random access resource corresponding to the slice group.
The method according to any one of claims 47-49, wherein the method further comprises:

In the case where the random access resource for a slice configured in the resource configuration information is applicable to its corresponding slice group, if the slice information triggering random access is the first slice group, the terminal device, based on the performing random access on the random access resource corresponding to the first slice group.
The method according to any one of claims 45-52, wherein the resource configuration information is included in a System Information Block (SIB) and/or Radio Resource Control (RRC) signaling.
The method according to any one of claims 45-53, wherein the method further comprises:

The terminal device executes the first random access procedure based on the slice-specific random access resources.
The method according to claim 45, wherein, in the random access resources, if the preamble group configured for the two-step random access procedure of the slice includes the first preamble group, the four-step random access procedure configuration The set of preambles includes the first set of preambles.
The method according to claim 55, wherein, in the case of supporting the fallback of the two-step random access procedure or supporting the fallback of the two-step random access procedure for the slice, if the two-step random access procedure for the slice is configured The set of preambles includes the first set of preambles, then the set of preambles configured in the four-step random access procedure includes the first set of preambles.
The method according to claim 55 or 56, wherein the four-step random access procedure includes at least one of the following: a four-step random access procedure for slices, a four-step random access procedure for non-slices, a four-step random access procedure for general Four-step random access process of resources, four-step general random access process.
The method according to any one of claims 55-57, wherein if the random access resources include resources for a two-step random access process for a slice and resources for a four-step random access process for a slice, Then the four-step random access process is a four-step random access process for slices.
The method according to any one of claims 55-58, wherein if the random access resources include resources for a two-step random access process for a slice but do not include resources for a four-step random access process for a slice , or, if the random access resources include resources of a two-step random access process for a slice but resources of a four-step random access process in the random access resources are only configured with general random access resources, then the The four-step random access process is a four-step random access process for non-slicing or a four-step random access process for common resources or a four-step universal random access process.
The method according to any one of claims 1-59, wherein the method further comprises:

The terminal device acquires slice-specific cell reselection information configured by the network device; wherein the slice-specific cell reselection information is applicable to its corresponding slice or corresponding slice group.
The method of claim 60, wherein the slice-specific cell reselection information corresponds to at least one slice or at least one slice group.
The method according to claim 60 or 61, wherein each slice or each slice group corresponds to only one slice-specific cell reselection information.
The method according to any one of claims 60-62, wherein the method further comprises:

If the slice information triggering cell reselection is the second slice, the terminal device determines the slice group to which the second slice belongs based on the mapping relationship between the slice and the slice group, and based on the cell reselection information corresponding to the slice group , to perform cell reselection.
The method according to any one of claims 60-62, wherein the method further comprises:

In the case that the cell reselection information for a slice is applicable to its corresponding slice group, if the slice information triggering cell reselection is the second slice, the terminal device determines the the slice group described in the second slice, and perform cell reselection based on the cell reselection information corresponding to the slice group.
The method according to any one of claims 60-62, wherein the method further comprises:

In the case that the cell reselection information for a slice is applicable to its corresponding slice group, if the slice information triggering cell reselection is the second slice group, the terminal device Reselection information for cell reselection.
The method according to any one of claims 60-62, wherein the method further comprises:

In the case where the cell reselection information for a slice is applicable to its corresponding slice, if the slice information triggering cell reselection is a second slice, the terminal device is based on the cell reselection information corresponding to the second slice Perform cell reselection.
The method according to any one of claims 60-62, wherein the method further comprises:

In the case that the cell reselection information for a slice is applicable to its corresponding slice, if the slice information triggering cell reselection is the second slice group, then the terminal device, based on the mapping relationship between the slice and the slice group, in the Determine a second slice from the second slice group, and perform cell reselection based on cell reselection information corresponding to the second slice.
The method according to any one of claims 60-67, wherein the cell reselection information for a slice includes a frequency point corresponding to a slice or a cell corresponding to a slice.
The method according to any one of claims 60-68, wherein the slice-specific cell reselection information is carried by SIB or dedicated signaling.
The method according to any one of claims 60-69, wherein, when the slice supported by the cell is the same as the slice supported by the service frequency point, the cell reselection information for the slice includes the frequency of the cell corresponding to the slice. point.
The method according to any one of claims 60-70, wherein when the slice supported by the cell is different from the slice supported by the service frequency point, the cell reselection information for the slice includes The cell identity CI or physical cell identity PCI corresponding to the frequency point and the slice, or the cell reselection information for the slice includes the cell identity CI or PCI corresponding to the cell, the frequency point corresponding to the cell, and the slice supported by the cell Alternatively, the slice-specific cell reselection information includes a cell identity CI or PCI corresponding to a cell and slice information supported by the cell.
The method according to any one of claims 70-71, wherein the slice information supported by the serving cell is the same as the slice supported by the serving frequency point.
The method according to any one of claims 1-72, wherein the method further comprises:

The terminal device acquires slice-specific cell selection information configured by the network device; wherein the slice-specific cell selection information is applicable to its corresponding slice or corresponding slice group.
The method of claim 73, wherein the slice-specific cell selection information corresponds to at least one slice or at least one slice group.
The method according to claim 72 or 73, wherein each slice or each slice group corresponds to only one slice-specific cell selection information.
The method according to any one of claims 72-75, wherein the method further comprises:

If the slice information that triggers cell selection is the third slice, the terminal device determines the slice group to which the third slice belongs based on the mapping relationship between slices and slice groups, and performs cell selection based on the cell selection information corresponding to the slice group. Cell selection.
The method according to any one of claims 72-75, wherein the method further comprises:

In the case that the cell selection information for a slice is applicable to its corresponding slice group, if the slice information triggering cell selection is the third slice, the terminal device determines the third slice based on the mapping relationship between the slice and the slice group. three slices of the slice group, and perform cell selection based on the cell selection information corresponding to the slice group.
The method according to any one of claims 72-75, wherein the method further comprises:

In the case that the cell selection information for a slice is applicable to its corresponding slice group, if the slice information triggering cell selection is the third slice group, the terminal device selects the information based on the cell selection information corresponding to the third slice group Perform neighborhood selection.
The method according to any one of claims 72-75, wherein the method further comprises:

In the case where the cell selection information for a slice is applicable to its corresponding slice, if the slice information triggering cell selection is a third slice, the terminal device performs cell selection based on the cell selection information corresponding to the third slice .
The method according to any one of claims 72-75, wherein the method further comprises:

In the case that the cell selection information for a slice is applicable to its corresponding slice, if the slice information triggering cell selection is the third slice group, then the terminal device, based on the mapping relationship between slices and slice groups, in the second A third slice is determined in the three-slice group, and cell selection is performed based on cell selection information corresponding to the third slice.
The method according to any one of claims 72-80, wherein the cell selection information for the slice includes a frequency point corresponding to the slice or a cell corresponding to the slice.
The method according to any one of claims 72-81, wherein the slice-specific cell selection information is carried by SIB or dedicated signaling.
The method according to any one of claims 72-82, wherein, when the slice supported by the cell is the same as the slice supported by the service frequency point, the cell selection information for the slice includes the frequency point of the cell corresponding to the slice .
The method according to any one of claims 72-83, wherein when the slice supported by the cell is different from the slice supported by the service frequency point, the cell selection information for the slice includes the frequency of the cell corresponding to the slice. The cell identity CI or the physical cell identity PCI corresponding to the point and the slice, or the cell reselection information for the slice includes the cell identity CI or PCI corresponding to the cell, the frequency point corresponding to the cell, and the slice information supported by the cell Or, the cell reselection information for a slice includes a cell identity CI or PCI corresponding to the cell and slice information supported by the cell.
The method according to any one of claims 72-84, wherein the slice information supported by the serving cell is the same as the slice supported by the serving frequency point.
The method according to any one of claims 1-85, wherein the method further comprises:

If it is determined that random access resources for slices are not configured, the access layer of the terminal device sends second information to the non-access layer of the terminal device, where the second information is used to indicate that the non-access The access layer does not send slice information to the access layer.
A random access method, comprising:

The network device sends first information to the terminal device, so that the terminal device determines whether to perform a fallback from the first random access procedure to the second random access procedure based on the first information;

Wherein, the first information is used to indicate whether to support or perform a rollback from the first random access procedure to the second random access procedure, or to indicate whether to support or perform a rollback from the first random access procedure to the second random access procedure. Rollback from the random access procedure to the third random access procedure.
The method according to claim 87, wherein the network device sending the first information to the terminal device comprises:

The preamble group configured in the first random access procedure is different from the preamble group configured in the second random access procedure, or the preamble group selection threshold configured in the first random access procedure is different from that configured in the second random access procedure. When the preamble group selection thresholds configured in the random access process are different, the network device sends the first information to the terminal device;

or,

The preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is different from that configured in the third random access procedure. In the case that the preamble group selection thresholds configured in the entry process are different, the network device sends the first information to the terminal device;

or,

The preamble group configured in the first random access procedure is the same as the preamble group configured in the second random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as that configured in the second random access procedure. When the preamble group selection thresholds configured in the random access process are the same, the network device sends the first information to the terminal device;

or,

The preamble group configured in the first random access procedure is the same as the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as that configured in the third random access procedure. In a case where the preamble group selection threshold configured in the random access procedure is the same, the network device sends the first information to the terminal device.
The method according to claim 87 or 88, wherein said method further comprises:

The network device sends resource configuration information to the terminal device, where the resource configuration information is used to indicate random access resources, and the random access resources include general random access resources and/or random access for slices resource.
The method according to any one of claims 87-89, wherein the method further comprises:

The network device sends cell reselection information for a slice to the terminal device; wherein the cell reselection information for a slice is applicable to a corresponding slice or a corresponding slice group.
The method according to claims 87-90, wherein said method further comprises:

The network device sends slice-specific cell selection information to the terminal device; wherein the slice-specific cell selection information is applicable to its corresponding slice or corresponding slice group.
A terminal device comprising:

A first processing module, configured to determine whether to perform a fallback from the first random access procedure to the second random access procedure based on the first information sent by the network device;

Wherein, the first information is used to indicate whether to support or perform a rollback from the first random access procedure to the second random access procedure, or to indicate whether to support or perform a rollback from the first random access procedure to the second random access procedure. Rollback from the random access procedure to the third random access procedure.
The terminal device of claim 92, wherein the first random access procedure comprises a slice-specific random access procedure.
The terminal device according to claim 92 or 93, wherein the second random access procedure comprises a random access procedure for non-slicing, or a random access procedure for general resources, or a general random access procedure .
The terminal device according to any one of claims 92-94, wherein the third random access procedure comprises a slice-specific random access procedure.
The terminal device according to any one of claims 92-95, wherein the first random access procedure includes a two-step random access procedure for a slice, and the third random access procedure includes a four-step random access procedure for a slice. Step random access process.
The terminal device according to any one of claims 92-96, wherein the second random access procedure comprises a four-step random access procedure for non-slicing, or a four-step random access procedure for common resources , or, a four-step universal random access procedure.
The terminal device according to any one of claims 92-97, wherein the first information includes a maximum number of transmissions and/or resources for a random access procedure.
The terminal device according to claim 98, wherein the first information includes the maximum number of transmissions for the second random access procedure, and/or the first information does not include the maximum number of transmissions for the third random access procedure The maximum number of transmissions of the access procedure, and/or, when the maximum number of transmissions for the second random access procedure in the first information is greater than or equal to 1, the first information is used to indicate that the The terminal device performs a fallback from the first random access procedure to the second random access procedure.
The terminal device according to claim 98, wherein the first information includes the maximum number of transmissions for the third random access procedure, and/or the first information does not include the maximum number of transmissions for the second random access procedure The maximum number of transmissions of the access procedure, and/or, when the maximum number of transmissions for the third random access procedure in the first information is greater than or equal to 1, the first information is used to indicate that the The terminal device performs fallback from the first random access procedure to the third random access procedure.
The terminal device according to claim 98, wherein the first information includes the maximum number of transmissions for the third random access procedure, and/or, the number of transmissions in the first information for the third random access procedure When the maximum number of transmissions of the access procedure is greater than or equal to 1, if the first information does not include resources for the third random access procedure, the first information is used to indicate that the terminal device is supported to perform slave A fallback from the first random access procedure to the second random access procedure.
The terminal device according to claim 98, wherein the first information includes the maximum number of transmissions for the third random access procedure, and/or, the number of transmissions in the first information for the third random access procedure In the case where the maximum number of transmissions of the access procedure is greater than or equal to 1, if the first information includes resources for the second random access procedure, the first information is used to indicate that the terminal device is supported to execute from the Rollback from the first random access procedure to the second random access procedure.
The terminal device according to any one of claims 92-102, wherein the first information corresponds to one of the plurality of slices, and the first information is applicable to the corresponding slice.
The terminal device according to any one of claims 92-102, wherein the first information corresponds to one slice group in the plurality of slice groups, and the first information is applicable to multiple slice groups in the corresponding slice group. slices.
The terminal device according to any one of claims 92-102, the first information is applicable to multiple slices or multiple slice groups.
The terminal device according to any one of claims 92-105, wherein the first processing module is configured to:

In a case where it is determined based on the first information that the first condition is satisfied, performing a rollback from the first random access procedure to the second random access procedure.
The terminal device according to any one of claims 92-106, wherein the first processing module is configured to:

If it is determined based on the first information that the first condition is satisfied, no rollback from the first random access procedure to the third random access procedure is performed.
The terminal device according to any one of claims 92-107, wherein the first processing module is configured to:

If it is determined based on the first information that the first condition is not satisfied, no rollback from the first random access procedure to the second random access procedure is performed.
The terminal device according to any one of claims 92-108, wherein the first processing module is configured to:

In a case where it is determined based on the first information that the first condition is not met, performing a fallback from the first random access procedure to the third random access procedure.
The terminal device according to any one of claims 106-109, wherein the first processing module is further configured to:

The preamble group configured in the first random access procedure is different from the preamble group configured in the second random access procedure, or the preamble group selection threshold configured in the first random access procedure is different from that configured in the second random access procedure If the preamble group selection thresholds configured in the two random access procedures are different, the terminal device falls back to the second random access procedure or determines whether the first condition is met based on the first information;

or,

The preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is different from that configured in the third random access procedure If the preamble group selection thresholds configured by the three random access procedures are different, the terminal device falls back to the second random access procedure or determines whether the first condition is satisfied based on the first information;

or,

The preamble group configured in the first random access procedure is the same as the preamble group configured in the second random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as that configured in the second random access procedure If the preamble group selection thresholds configured in the two random access procedures are the same, the terminal device falls back to the second random access procedure or determines whether the first condition is satisfied based on the first information;

or,

The preamble group configured in the first random access procedure is the same as the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as that configured in the third random access procedure If the preamble group selection thresholds configured by the three random access procedures are the same, the terminal device falls back to the second random access procedure or determines whether the first condition is met based on the first information.
The terminal device according to any one of claims 92-110, wherein the first processing module is further configured to:

The preamble group configured in the first random access procedure is the same as the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as that configured in the third random access procedure In a case where the preamble group selection thresholds configured by the three random access procedures are the same, the terminal device falls back to the third random access procedure.
The terminal device according to any one of claims 106-110, wherein the first condition includes at least one of the following:

receiving the first message;

The first information appears in a first message sent by the network device;

The first information indicates that the terminal device is supported to perform rollback from the first random access procedure to the second random access procedure;

The first information includes a maximum number of transmissions for the second random access procedure;

The first information does not include a maximum number of transmissions for the third random access procedure;

The first information does not include a maximum number of random access transmissions for a slice;

resources for the third random access procedure are not configured;

The first information includes a maximum number of random access transmissions for a slice;

The maximum number of random access transmissions for slices is less than 1;

configuring resources for the second random access procedure;

The use condition of the first information is met.
The terminal device according to claim 112, wherein the usage conditions of the first information include at least one of the following:

The number of preamble transmissions of the first random access procedure is greater than the maximum number of random access transmissions for the slice;

resources for the third random access procedure are not configured;

The preamble group configured in the first random access procedure is the same as the preamble group configured in the second random access procedure;

The preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure;

configuring resources for the second random access procedure;

configuring a maximum number of transmissions for the second random access procedure;

The maximum number of transmissions for the third random access procedure is not configured;

The maximum number of random access transmissions for slices is not configured;

Configuring the maximum number of transmissions for the third random access procedure;

Configure the maximum number of random access transmissions for slices;

The maximum number of random access transmissions for the slice or the maximum number of transmissions for the third random access procedure is greater than or equal to 1.
The terminal device according to any one of claims 92-113, wherein the first processing module is further configured to:

In the case of performing a fallback from the first random access procedure to the second random access procedure, the terminal device is based on the medium access control protocol of message A in the first random access procedure The data unit MAC PDU obtains the MAC PDU of the third step message in the second random access process.
The terminal device according to claim 114, wherein the first processing module is configured to:

If the second condition is met, the MAC PDU of message A in the first random access process is used as the MAC PDU of the third step message in the second random access process;

and / or,

If the third condition is met, repacking is performed based on the MAC PDU of message A in the first random access process to obtain the MAC PDU in the third step message of the second random access process.
The terminal device according to claim 115, wherein, in the process of reassembling packets based on the MAC PDU of message A in the first random access procedure, if the third step in the second random access procedure If the resource size of the message is greater than the grant size of message A in the first random access procedure, the terminal device fills the remaining space of the PDU based on preset bits or new data.
The terminal device according to any one of claims 114-116, wherein the first processing module is further configured to:

Obtain the MAC PDU of the message A in the message A buffer.
The terminal device according to any one of claims 114-117, wherein the first processing module is further configured to:

The MAC PDU of the third step message in the second random access process obtained based on the MAC PDU of message A in the first random access process is stored in the third step message buffer.
The terminal device according to any one of claims 92-118, wherein the first processing module is further configured to:

In the case of performing a fallback from the first random access procedure to the third random access procedure, the terminal device is based on the medium access control protocol of message A in the first random access procedure The data unit MAC PDU is to obtain the MAC PDU of the third step message in the third random access process.
The terminal device according to claim 119, wherein the first processing module is specifically configured to:

If the second condition is met, the MAC PDU of message A in the first random access process is used as the MAC PDU of the third step message in the third random access process;

and / or,

If the third condition is met, repacking is performed based on the MAC PDU of message A in the first random access process, to obtain the MAC PDU of the third step message in the third random access process.
The terminal device according to claim 120, wherein, in the process of reassembling packets based on the MAC PDU of message A in the first random access process, if the third step in the third random access process If the resource size of the message is greater than the grant size of message A in the first random access procedure, the terminal device fills the remaining space of the PDU based on preset bits or new data.
The terminal device according to any one of claims 119-121, wherein the first processing module is further configured to:

Obtain the MAC PDU of the message A in the message A buffer.
The terminal device according to any one of claims 119-122, wherein the first processing module is further configured to:

The MAC PDU of the third step message in the third random access process obtained based on the MAC PDU of message A in the first random access process is stored in the third step message buffer.
The terminal device according to any one of claims 115, 116, 120, and 121, wherein the second condition includes at least one of the following:

The preamble group configured in the first random access procedure is the same as the preamble group configured in the second random access procedure;

The preamble group selection threshold configured in the first random access procedure is the same as the preamble group selection threshold configured in the second random access procedure;

Therefore, the authorization size of the third step message in the second random access process is the same as the MAC PDU size of message A in the first random access process;

The preamble group configured in the first random access procedure is the same as the preamble group configured in the third random access procedure;

The preamble group selection threshold configured in the first random access procedure is the same as the preamble group selection threshold configured in the third random access procedure;

Therefore, the grant size of the third-step message in the third random access procedure is the same as the MAC PDU size of message A in the first random access procedure.
The terminal device according to any one of claims 115, 116, 120, 121, and 124, wherein the third condition includes at least one of the following:

The preamble group configured in the first random access procedure is different from the preamble group configured in the second random access procedure;

The preamble group selection threshold configured in the first random access procedure is different from the preamble group selection threshold configured in the second random access procedure;

Therefore, the authorization size of the third step message in the second random access procedure is different from the MAC PDU size of message A in the first random access procedure;

The preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure;

The preamble group selection threshold configured in the first random access procedure is different from the preamble group selection threshold configured in the third random access procedure;

Therefore, the authorization size of the third step message in the third random access procedure is different from the MAC PDU size of message A in the first random access procedure.
The terminal device according to any one of claims 115, 116, 120, 121, 124, and 125, wherein, in the process of reassembling packets based on the MAC PDU of message A in the first random access process, The terminal device multiplexes the data and/or the MAC CE according to the priority of the data and/or the priority of the MAC CE.
The terminal device according to any one of claims 115, 116, 120, 121, 124-126, wherein, in the process of reassembling packets based on the MAC PDU of message A in the first random access process, The terminal device preferentially multiplexes data.
The terminal device according to any one of claims 92-127, wherein the first processing module is further configured to:

If the fourth condition is met, the terminal device stops random access, stops performing rollback from the first random access procedure to the second random access procedure, or determines that random access fails.
The terminal device according to any one of claims 92-128, wherein the first processing module is further configured to:

When the fourth condition is met, the terminal device stops random access, stops performing rollback from the first random access procedure to the third random access procedure, or determines that random access fails.
The terminal device according to claim 128 or 129, wherein the fourth condition comprises:

The preamble group configured in the first random access procedure is different from the preamble group configured in the second random access procedure;

The preamble group selection threshold configured in the first random access procedure is different from the preamble group selection threshold configured in the second random access procedure;

Therefore, the authorization size of the third step message in the second random access procedure is different from the MAC PDU size of message A in the first random access procedure;

The preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure;

The preamble group selection threshold configured in the first random access procedure is different from the preamble group selection threshold configured in the third random access procedure;

Therefore, the authorization size of the third step message in the third random access procedure is different from the MAC PDU size of message A in the first random access procedure.
The terminal device according to any one of claims 92-130, wherein the first processing module is further configured to:

Acquire random access resources based on resource configuration information sent by the network device; where the random access resources include general random access resources and/or slice-specific random access resources.
The terminal device according to claim 131, wherein the first processing module is further configured to:

In case the random access resources do not include random access resources for slices, a random access procedure is performed using general random access resources.
The terminal device according to claim 131 or 132, wherein the random access resource for a slice is applicable to its corresponding slice or multiple slices in a corresponding slice group.
The terminal device according to any one of claims 131-133, wherein the resource configuration information is included in a System Information Block (SIB) and/or Radio Resource Control (RRC) signaling.
The terminal device according to any one of claims 131-134, wherein the first processing module is further configured to:

The first random access procedure is performed based on the slice-specific random access resources.
The terminal device according to any one of claims 92-135, wherein the first processing module is further configured to:

If it is determined that random access resources for slices are not configured, the access layer of the terminal device sends second information to the non-access layer of the terminal device, where the second information is used to indicate that the non-access The access layer does not send slice information to the access layer.
A network device comprising:

A first communication module, configured to send first information to a terminal device, so that the terminal device determines whether to perform a rollback from the first random access procedure to the second random access procedure based on the first information;

Wherein, the first information is used to indicate whether to support or perform a rollback from the first random access procedure to the second random access procedure, or to indicate whether to support or perform a rollback from the first random access procedure to the second random access procedure. Rollback from the random access procedure to the third random access procedure.
The network device according to claim 137, wherein the first communication module is specifically used for:

The preamble group configured in the first random access procedure is different from the preamble group configured in the second random access procedure, or the preamble group selection threshold configured in the first random access procedure is different from that configured in the second random access procedure. If the preamble group selection thresholds configured in the random access process are different, sending the first information to the terminal device;

or,

The preamble group configured in the first random access procedure is different from the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is different from that configured in the third random access procedure. Sending the first information to the terminal device when the preamble group selection thresholds configured in the entry process are different;

or,

The preamble group configured in the first random access procedure is the same as the preamble group configured in the second random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as that configured in the second random access procedure. When the preamble group selection thresholds configured in the random access process are the same, sending the first information to the terminal device;

or,

The preamble group configured in the first random access procedure is the same as the preamble group configured in the third random access procedure, or the preamble group selection threshold configured in the first random access procedure is the same as that configured in the third random access procedure. If the preamble group selection thresholds configured in the random access procedure are the same, the first information is sent to the terminal device.
The network device according to claim 137 or 138, wherein the first communication module is further configured to:

Send resource configuration information to the terminal device, where the resource configuration information is used to indicate random access resources, where the random access resources include general random access resources and/or slice-specific random access resources.
The network device according to claim 139, wherein the random access resource for a slice is applicable to its corresponding slice or a plurality of slices in a corresponding slice group.
The network device according to claim 139 or 140, wherein the resource configuration information is included in a System Information Block (SIB) and/or Radio Resource Control (RRC) signaling.
A terminal device, comprising: a processor and a memory, the memory is used to store computer programs, the processor calls and runs the computer programs stored in the memory, and executes the computer program described in any one of claims 1 to 86 steps of the method.
A network device, comprising: a processor and a memory, the memory is used to store computer programs, the processor invokes and runs the computer programs stored in the memory, and executes the computer program described in any one of claims 87 to 91 steps of the method.
A chip comprising:

The processor is configured to call and run the computer program from the memory, so that the device installed with the chip executes the steps of the method according to any one of claims 1 to 91.
A computer-readable storage medium for storing a computer program, wherein,

The computer program causes a computer to perform the steps of the method as claimed in any one of claims 1-91.
A computer program product comprising computer program instructions, wherein,

The computer program instructions cause a computer to perform the steps of the method as claimed in any one of claims 1-91.
A computer program that causes a computer to execute the steps of the method as claimed in any one of claims 1 to 91.
A communication system comprising:

A terminal device, configured to perform the method according to any one of claims 1 to 86;

A network device, configured to execute the method according to any one of claims 87-91.