WO2020221310A1

WO2020221310A1 - Random access method, apparatus, and system

Info

Publication number: WO2020221310A1
Application number: PCT/CN2020/087845
Authority: WO
Inventors: 王超; 陈英侃; 陈雁
Original assignee: 华为技术有限公司
Priority date: 2019-04-30
Filing date: 2020-04-29
Publication date: 2020-11-05
Also published as: CN111867135B; CN111867135A

Abstract

Embodiments of the present application provide a random access method, apparatus, and system. The present application can improve the access efficiency of a terminal device. Specifically, a network device determines K TA values after receiving multiple first messages, and sends a second message, the second message comprising the K TA values and a TC-RNTI and an uplink grant corresponding to each of the K TA values, and K being a positive integer greater than 1. A first terminal device receives the second message, determines a first TA value from the K TA values, and sends, on a resource indicated by the uplink grant corresponding to the first TA value, a third message comprising the identifier of the first terminal device to the network device, the third message being scrambled by means of the TC-RNTI corresponding to the first TA value. The network device receives, on the resource indicated by the uplink grant corresponding to the first TA value, the third message from the first terminal device, and sends a first message comprising an access resource allocated by the network device, a downlink data channel carrying the fourth message being scheduled by DCI, and the DCI being scrambled by means of the TC-RNTI corresponding to the first TA value.

Description

Random access method, device and system

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office on April 30, 2019, the application number is 201910364173.4, and the application name is "Random Access Method, Apparatus, and System", the entire content of which is incorporated herein by reference Applying.

Technical field

This application relates to the field of communications, and in particular to random access methods, devices and systems.

Background technique

At present, when a terminal device initiates random access, it needs to send a preamble to the network device. When different terminal devices use contention-based random access mode to access, there may be a situation where multiple terminal devices send the same preamble to the network device through different message 1 (Msg1).

In the prior art, after receiving different Msg1 including the same preamble sent by multiple terminal devices, a network device will only detect the timing advance corresponding to one of the terminal devices (usually the terminal device with the strongest signal power). advance, TA). Further, the network device sends a message 2 (message 2, Msg2) (also called a random access response (RAR)) to the multiple terminal devices, and the message 2 includes the TA of the detected terminal device. , Used to scramble message 3 (message 3, Msg3) temporary cell radio network temporary identifier (temporary cell radio network temporary identifier, TC-RNTI), and uplink authorization (uplink link grant, UL-Grant), where UL- Grant instructs the multiple terminal devices to send resources of Msg3. After receiving the message 2, the multiple terminal devices respectively adjust the TA according to the TA included in the message 2, and send Msg3 to the network device on the resource indicated by the UL-Grant. The Msg3 includes the terminal identification of the terminal device. Since Msg3 sent by multiple terminal devices are transmitted on the same resource, after receiving Msg3 sent by multiple terminal devices, the network device may only demodulate the signal sent by one terminal device (usually the terminal device with the strongest signal power). Msg3. Furthermore, the network device can send a message 4 (message 4, Msg4) to multiple terminal devices. The Msg4 includes a contention resolution identifier (CRID) (usually a terminal identifier included in the demodulated Msg3) and a corresponding Access resource indication. After multiple terminal devices receive Msg4 and demodulate it, if the CRID included in Msg4 is the same as its terminal ID, the terminal device competes successfully, and the terminal device can continue to send signals on the access resources indicated by Msg4, and Establish a radio resource control (radio resource connection, RRC) connection; if the CRID included in the Msg4 is different from the terminal identifier, the terminal device fails the competition and needs to continue to wait for the next access opportunity for random access. To sum up, at present, when different terminal devices use a contention-based random access method to access, at most one terminal device among multiple terminal devices that send the same preamble to the network device can compete successfully.

However, in the 5th generation (5G) system, there are scenarios where there are a large number of terminal devices in a single cell, such as massive machine type communication (mMTC), etc. The existing random access schemes obviously cannot guarantee Access performance of terminal equipment.

Summary of the invention

The embodiments of the present application provide a random access method, device, and system, which can improve the access efficiency of terminal equipment.

In order to achieve the foregoing objectives, the embodiments of the present application adopt the following technical solutions:

In the first aspect, a random access method and corresponding device are provided. In this solution, the network device receives multiple first messages and determines K TA values, where K is a positive integer greater than 1. The network device sends a second message, and the second message includes K TA values, TC-RNTI and uplink grant corresponding to each of the K TA values. The network device receives a third message from the first terminal device on the resource indicated by the uplink grant corresponding to the first TA value. The third message is scrambled by the TC-RNTI corresponding to the first TA value, and the third message includes the terminal device And send a fourth message to the first terminal device. The fourth message includes the access resource allocated by the network device. The downlink data channel carrying the fourth message is scheduled by the downlink control information DCI. The DCI corresponds to the first TA value TC-RNTI scrambling. Based on this solution, after receiving multiple first messages, the network device can determine multiple TA values, as well as the TC-RNTI and uplink authorization corresponding to each TA value, and send them in the second message. After receiving the second message, multiple terminal devices that use the same preamble to initiate random access can determine a TA value from the K TA values, and send it to the network device on the resource of the uplink authorization indication corresponding to the TA value. The third news. In addition, because the resources indicated by the uplink authorization corresponding to each TA value are different, the network device can demodulate the third message sent by each terminal device, and send a fourth message for each third message. The fourth message includes the connection In this way, multiple terminal devices using the same preamble can continue to send signals on their corresponding access resources. Therefore, compared with the prior art competition-based random access scheme, multiple terminal devices using the same preamble can be The terminal equipment is connected at the same time, which improves the access efficiency of the terminal equipment.

In a possible design, the fourth message further includes a contention resolution identification CRID, and the CRID indicates a terminal device whose contention is successful. Since the CRID is included in the fourth message, when multiple terminal devices select the same TA value from K TA values, one of the multiple terminal devices that select the same TA value can still be accessed successfully , Improve the access efficiency of terminal equipment.

In a possible design, the network device determining K TA values includes: the network device inputs a signal carrying multiple first messages into the first neural network to obtain the number of terminal devices using the first preamble; the network device Input the number of terminal devices and the signal carrying multiple first messages into the second neural network to obtain K TA values.

In the second aspect, a random access method and corresponding device are provided. In this solution, the first terminal device sends a first message to the network device, the first message includes a first preamble; the first terminal device receives a second message from the network device, the second message includes K TA values, and The temporary cell radio network temporary identifier TC-RNTI and uplink grant corresponding to each of the K TA values, K is a positive integer greater than 1, and the first terminal device determines the first TA from the K TA values Value; the first terminal device sends a third message to the network device on the resource indicated by the uplink authorization corresponding to the first TA value, the third message is scrambled by the TC-RNTI corresponding to the first TA value, and the third message Including the identifier of the first terminal device; the first terminal device receives a fourth message from the network device according to the TC-RNTI corresponding to the first TA value, and the fourth message includes the access resource allocated by the network device. Among them, the technical effects brought about by the second aspect can be referred to the technical effects brought about by the above-mentioned first aspect, which will not be repeated here.

In a possible design, the first terminal device determines the first TA value from the above K TA values, including: the first terminal device determines the reference TA value according to the historical TA information of the first terminal device; the first terminal device Among the above K TA values, the TA value closest to the reference TA value is determined as the first TA value.

In a possible design, the first terminal device determines the first TA value from the above K TA values, including: the first terminal device randomly selects a TA value from the above K TA values; A randomly selected TA value is determined as the first TA value.

In a possible design, the foregoing fourth message further includes: a contention resolution identification CRID, and if the CRID corresponds to the identification of the first terminal device, the first terminal device will report to the network device on the access resource included in the fourth message. Send an acknowledgment ACK; or, if the CRID does not correspond to the identity of the first terminal device, the first terminal device terminates the random access or transfers to the next random access. Since the CRID is included in the fourth message, when multiple terminal devices select the same TA value from K TA values, one of the multiple terminal devices that select the same TA value can still be accessed successfully , Improve the access efficiency of terminal equipment.

In the third aspect, a random access method and corresponding device are provided. In this solution, the network device receives a plurality of first messages, each of the plurality of first messages includes a first preamble; the network device determines the first TA value according to the first preamble, and sends the first TA value A second message. The second message includes a first TA value, a first temporary cell radio network temporary identifier TC-RNTI corresponding to the first TA value, and a first uplink authorization; the network device is instructed by the first uplink authorization After successfully demodulating the K third messages scrambled by the first TC-RNTI on the resource, each of the K third messages includes an identifier of a terminal device, and K is a positive integer greater than 1. The network device sends a fourth message. The fourth message includes K contention resolution identifiers, CRIDs, and access resources corresponding to each of the K CRIDs, where each CRID corresponds to the K third messages. The identifier of the terminal device in a third message of, the downlink data channel carrying the fourth message is scheduled by the downlink control information DCI, and the DCI is scrambled by the above-mentioned first TC-RNTI. Based on this solution, since the network device can successfully demodulate K third messages after receiving the third message, and each of the K third messages includes the terminal device identification corresponding to a CRID, In the fourth message, K CRIDs and the access resources corresponding to each CRID are sent. Therefore, after multiple terminal devices using the same preamble receive the fourth message, they can determine a CRID according to its identifier, and the CRID corresponds to it. Signals continue to be sent on the access resources of the prior art, so compared to the competition-based random access scheme in the prior art, multiple terminal devices that select the same preamble can be simultaneously accessed, which improves the access efficiency of the terminal devices.

In a possible design, the foregoing fourth message further includes a TA value corresponding to each of the foregoing CRIDs, and the TA value is used for the terminal device corresponding to each CRID to perform TA adjustment. Based on this solution, since the TA value corresponding to each CRID in the fourth message is obtained by the network device according to the first message or the third message sent by the terminal device corresponding to the CRID, for each terminal device corresponding to the CRID, The TA adjusted by using the TA value corresponding to the CRID is more accurate, which improves the accuracy of TA adjustment.

In a possible design, the foregoing second message further includes indication information, which is used to indicate that there are multiple terminal devices on the resource indicated by the foregoing first uplink authorization to send the third message to the network device. Based on this solution, after receiving the indication information, the terminal device can process the third message in a non-orthogonal manner before sending it, which makes it complicated for the network device to demodulate multiple third messages on the resources indicated by the first uplink authorization. The degree is reduced, and the performance of the network device to demodulate the third message is improved.

In a possible design, the indication information is also used to indicate the number of terminal devices that send the third message to the network device on the resource indicated by the first uplink grant.

In a possible design, the foregoing indication information is specifically the value of the first TC-RNTI.

In a possible design, the location of the time-frequency resource for sending the second message is used to indicate that there are multiple terminal devices on the resource indicated by the first uplink grant to send the third message to the network device. Based on this solution, the terminal device can process the third message in a non-orthogonal manner according to the position of the time-frequency resource receiving the second message before sending it, so that the network device can demodulate multiple resources on the resources indicated by the first uplink authorization. The complexity of the third message is reduced, and the performance of the network device in demodulating the third message is improved.

In a possible design, the network device successfully demodulates the K third messages scrambled by the first TC-RNTI on the resource indicated by the first uplink grant, including: the network device determines the non-orthogonal parameter, The non-orthogonal parameter includes one or more of the following: spreading sequence, interleaving pattern, or multi-dimensional constellation modulation codebook; the network device successfully demodulates the non-orthogonal parameter based on the resource indicated by the first uplink grant K third news.

In the fourth aspect, a random access method and corresponding device are provided. In this solution, the first terminal device sends a first message to the network device, the first message includes a first preamble; the first terminal device receives a second message from the network device, the second message includes the first TA value, and The first temporary cell radio network temporary identifier TC-RNTI and the first uplink authorization corresponding to the first TA value; the first terminal device sends a third message to the network device on the resource indicated by the first uplink authorization, and The third message is scrambled using the first TC-RNTI, and the third message includes the identification of the first terminal device; the first terminal device receives the fourth message from the network device according to the first TC-RNTI, the fourth message It includes K contention resolution identifiers CRIDs and access resources corresponding to each CRID of the K CRIDs, where each CRID corresponds to one of the K third messages successfully demodulated by the network device. The identification of the terminal device included in the message, K is a positive integer greater than 1. Among them, the technical effects brought about by the fourth aspect can be referred to the technical effects brought about by the above-mentioned second aspect, which will not be repeated here.

In a possible design, the foregoing fourth message further includes the TA value corresponding to each of the foregoing CRIDs; the random access method provided in this application further includes: if the K CRIDs include the identity of the first terminal device Corresponding to the first CRID, the first terminal device performs TA adjustment according to the TA value corresponding to the first CRID. Based on this solution, the first terminal device performs TA modulation according to the TA value corresponding to the CRID corresponding to the first terminal device, which can improve the accuracy of TA adjustment by the first terminal device.

In a possible design, the foregoing second message further includes indication information, which is used to indicate that there are multiple terminal devices on the resource indicated by the first uplink authorization to send the third message to the network device. Based on this solution, after receiving the indication information, the terminal device can process the third message in a non-orthogonal manner before sending it, which makes it complicated for the network device to demodulate multiple third messages on the resources indicated by the first uplink authorization. The degree is reduced, and the performance of the network device to demodulate the third message is improved.

In a possible design, the indication information is specifically the value of the first TC-RNTI.

In a possible design, the first terminal device sends a third message to the network device on the resource indicated by the first uplink grant, including: the first terminal device sends the network device on the resource indicated by the first uplink grant The device sends the third message processed in a non-orthogonal processing manner, and the non-orthogonal processing manner includes one or more of the following: using spreading sequence spreading, using interleaving pattern interleaving, or using multi-dimensional constellation modulation codebook modulation.

In a fifth aspect, a communication device is provided for implementing the above-mentioned various methods. The communication device may be the network device in the first aspect or the third aspect, or a device including the foregoing network device; or, the communication device may be the first terminal device in the second or fourth aspect, or include The above-mentioned first terminal device. The communication device includes a module, unit, or means corresponding to the foregoing method, and the module, unit, or means can be implemented by hardware, software, or hardware execution of corresponding software. The hardware or software includes one or more modules or units corresponding to the above-mentioned functions.

In a sixth aspect, a communication device is provided, including: a processor and a memory; the memory is used to store computer instructions, and when the processor executes the instructions, the communication device executes the method described in any of the above aspects. The communication device may be the network device in the first aspect or the third aspect, or a device including the foregoing network device; or, the communication device may be the first terminal device in the second or fourth aspect, or include The above-mentioned first terminal device.

In a seventh aspect, a communication device is provided, including: a processor; the processor is configured to couple with a memory, and after reading an instruction in the memory, execute the method according to any of the foregoing aspects according to the instruction. The communication device may be the network device in the first aspect or the third aspect, or a device including the foregoing network device; or, the communication device may be the first terminal device in the second or fourth aspect, or include The above-mentioned first terminal device.

In an eighth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores instructions that, when run on a communication device, enable a computer to execute the method described in any of the above aspects. The communication device may be the network device in the first aspect or the third aspect, or a device including the foregoing network device; or, the communication device may be the first terminal device in the second or fourth aspect, or include The above-mentioned first terminal device.

In a ninth aspect, a computer program product containing instructions is provided, which when running on a communication device, enables a computer to execute the method described in any of the above aspects. The communication device may be the network device in the first aspect or the third aspect, or a device including the foregoing network device; or, the communication device may be the first terminal device in the second or fourth aspect, or include The above-mentioned first terminal device.

In a tenth aspect, a communication device is provided (for example, the communication device may be a chip or a chip system), and the communication device includes a processor for implementing the functions involved in any of the above aspects. In a possible design, the communication device further includes a memory for storing necessary program instructions and data. When the communication device is a chip system, it may be composed of chips, or may include chips and other discrete devices.

Among them, the technical effects brought about by any of the design methods of the fifth aspect to the tenth aspect can be referred to the technical effects brought about by the different design methods in the first aspect or the second aspect or the third aspect or the third aspect. I won't repeat them here.

In an eleventh aspect, a communication system is provided, which includes the first terminal device described in the foregoing aspect and the network device described in the foregoing aspect.

Description of the drawings

FIG. 1 is a schematic structural diagram of a communication system provided by an embodiment of this application;

FIG. 2 is a schematic structural diagram of a terminal device and a network device provided by an embodiment of the application;

FIG. 3 is a schematic diagram of another structure of a terminal device provided by an embodiment of the application;

FIG. 4 is a schematic flowchart of a random access method provided by an embodiment of this application;

FIG. 5 is a schematic diagram of a method for determining a TA value provided by an embodiment of the application;

6 is a schematic diagram of a terminal device receiving a second message and sending a third message according to an embodiment of the application;

FIG. 7 is a schematic diagram of another flow of the random access method provided by an embodiment of the application;

FIG. 8 is a schematic diagram of receiving a fourth message by a terminal device according to an embodiment of the application;

FIG. 9 is a schematic structural diagram of another network device provided by an embodiment of this application;

FIG. 10 is a schematic structural diagram of another terminal device provided by an embodiment of this application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Wherein, in the description of this application, unless otherwise specified, "/" means that the objects associated before and after are in an "or" relationship, for example, A/B can mean A or B; in this application, "and/or "It's just an association relationship that describes the associated objects. It means that there can be three kinds of relationships. For example, A and/or B can mean: A alone exists, A and B exist at the same time, and B exists alone. , B can be singular or plural. Also, in the description of this application, unless otherwise specified, "plurality" means two or more than two. "The following at least one item (a)" or similar expressions refers to any combination of these items, including any combination of a single item (a) or plural items (a). For example, at least one item (a) of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple . In addition, in order to facilitate a clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish the same or similar items with substantially the same function and effect. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and order of execution, and words such as "first" and "second" do not limit the difference.

The technical solutions of the embodiments of the present application can be applied to various communication systems. For example: Orthogonal Frequency-Division Multiple Access (OFDMA), Single Carrier Frequency-Division Multiple Access (Single Carrier FDMA, SC-FDMA) and other systems. The term "system" can be replaced with "network". The OFDMA system can implement wireless technologies such as evolved universal terrestrial radio access (E-UTRA) and ultra mobile broadband (UMB). E-UTRA is an evolved version of the Universal Mobile Telecommunications System (UMTS). The 3rd generation partnership project (3GPP) uses the new version of E-UTRA in long term evolution (LTE) and various versions based on LTE evolution. The 5G communication system is the next generation communication system under study. Among them, 5G communication systems include non-standalone (NSA) 5G mobile communication systems, standalone (standalone, SA) 5G mobile communication systems, or NSA’s 5G mobile communication systems and SA’s 5G mobile communication system. In addition, the communication system may also be applicable to future-oriented communication technologies, all of which are applicable to the technical solutions provided in the embodiments of the present application. The above-mentioned communication system applicable to the present application is only an example, and the communication system applicable to the present application is not limited to this, and the description is unified here, and the details are not repeated below.

As shown in Fig. 1, a communication system 10 provided by an embodiment of this application. The communication system 10 includes a network device 30 and a plurality of terminal devices 20 connected to the network device 30. Optionally, different terminal devices 20 can communicate with each other.

Taking the network device 30 shown in FIG. 1 interacting with multiple terminal devices 20, the multiple terminal devices 20 include the first terminal device 20 as an example. In this embodiment of the present application, in a possible implementation manner, the first terminal device Device 20 sends a first message to network device 30. The first message includes a first preamble. After receiving multiple first messages, network device 30 determines K timing advance TA values and sends a second message. The second message includes K TA values, and the TC-RNTI and uplink grant corresponding to each of the K TA values, where K is a positive integer greater than 1. After receiving the second message from the network device 30, the first terminal device 20 determines the first TA value from the K TA values, and sends the third message to the network device 30 on the resource indicated by the uplink authorization corresponding to the first TA value , The third message is scrambled with the TC-RNTI corresponding to the first TA value, and the third message includes the identification of the terminal device. After the network device 30 receives the third message from the first terminal device 20 on the resource indicated by the uplink grant corresponding to the first TA value, it sends a fourth message to the first terminal device 20. The fourth message includes the allocation of the network device 30 Access resources, the downlink data channel carrying the fourth message is scheduled by the downlink control information DCI, and the DCI is scrambled by the TC-RNTI corresponding to the first TA value. Among them, the specific implementation of this solution will be described in detail in the subsequent method embodiments, and will not be repeated here. Based on this solution, since the network device 30 can determine multiple TA values, TC-RNTI and uplink authorization corresponding to each TA value after receiving multiple first messages, and send them in the second message, Therefore, after multiple terminal devices that use the same preamble to initiate random access receive the second message, they can determine a TA value from the K TA values, and report to the network device on the resource indicated by the uplink authorization corresponding to the TA value. Send the third message. In addition, because the resources indicated by the uplink authorization corresponding to each TA value are different, the network device can demodulate the third message sent by each terminal device, and send a fourth message for each third message. The fourth message includes the connection In this way, multiple terminal devices using the same preamble can continue to send signals on their corresponding access resources. Therefore, compared with the prior art competition-based random access scheme, multiple terminal devices using the same preamble can be The terminal equipment is connected at the same time, which improves the access efficiency of the terminal equipment.

Or, taking the network device 30 shown in FIG. 1 interacting with multiple terminal devices 20, the multiple terminal devices 20 include the first terminal device 20 as an example. In this embodiment of the present application, in another possible implementation manner, The first terminal device 20 sends a first message to the network device 30. The first message includes the first preamble. After receiving multiple first messages, the network device 30 determines the first TA value according to the first preamble and sends the second Message, the second message includes the first TC-RNTI and the first uplink grant corresponding to the first TA value. After the first terminal device 20 receives the second message from the network device 30, it sends a third message to the network device 30 on the resource indicated by the first uplink authorization. The third message is scrambled by the first TC-RNTI. The message includes the identification of the first terminal device 20. After successfully demodulating the K third messages scrambled with the first TC-RNTI on the resources indicated by the first uplink authorization, the network device 30 sends a fourth message. The fourth message includes K contention resolution indicators CRIDs, and The access resource corresponding to each CRID in the K CRIDs, where K is a positive integer greater than 1, and each CRID corresponds to the identification of the terminal device in one of the K third messages, and carries the first The downlink data channel of the four messages is scheduled by the downlink control information DCI, and the DCI is scrambled by the above-mentioned first TC-RNTI. Among them, the specific implementation of this solution will be described in detail in the subsequent method embodiments, and will not be repeated here. Based on this solution, since the network device can successfully demodulate K third messages after receiving the third message, and each of the K third messages includes the terminal device identification corresponding to a CRID, In the fourth message, K CRIDs and the access resources corresponding to each CRID are sent. Therefore, after multiple terminal devices using the same preamble receive the fourth message, they can determine a CRID according to its identifier, and the CRID corresponds to it. Signals continue to be sent on the access resources of the prior art, so compared to the competition-based random access scheme in the prior art, multiple terminal devices that select the same preamble can be simultaneously accessed, which improves the access efficiency of the terminal devices.

Optionally, the network device 30 in the embodiment of the present application is a device that connects the terminal device 20 to the wireless network, and may be an evolved Node B (evolutional Node B in long term evolution (LTE)). eNB or eNodeB); or base station in 5G network or public land mobile network (PLMN), broadband network service gateway (BNG), convergence switch or non-third-generation partner project (3rd generation partnership project, 3GPP) access equipment, etc., this embodiment of the application does not specifically limit this. Optionally, the base stations in the embodiments of the present application may include various forms of base stations, such as macro base stations, micro base stations (also called small stations), relay stations, access points, etc., which are not specifically limited in the embodiments of the present application .

Optionally, the terminal device 20 in the embodiment of the present application may be a device for implementing wireless communication functions, such as a terminal or a chip that can be used in a terminal. Among them, the terminal may be a user equipment (UE), an access terminal, a terminal unit, a terminal station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, and wireless communication in a 5G network or a future evolved PLMN. Equipment, terminal agent or terminal device, etc. The access terminal can be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), with wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices or wearable devices, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, industrial control (industrial) Wireless terminal in control), wireless terminal in self-driving, wireless terminal in remote medical, wireless terminal in smart grid, wireless terminal in transportation safety (transportation safety) Terminal, wireless terminal in smart city, wireless terminal in smart home, etc. The terminal can be mobile or fixed.

Optionally, the network device 30 and the terminal device 20 in the embodiment of the present application may also be referred to as communication devices, which may be a general-purpose device or a dedicated device, which is not specifically limited in the embodiment of the present application.

Optionally, as shown in FIG. 2, it is a schematic structural diagram of the network device 30 and the terminal device 20 provided in this embodiment of the application.

The terminal device 20 includes at least one processor (in FIG. 2 exemplarily includes a processor 201 for illustration) and at least one transceiver (in FIG. 2 exemplarily includes a transceiver 203 as an example for illustration) ). Optionally, the terminal device 20 may further include at least one memory (in FIG. 2 exemplarily includes a memory 202 for illustration), at least one output device (in FIG. 2 exemplarily includes an output device 204 as an example. For description) and at least one input device (in FIG. 2 exemplarily, an input device 205 is included for description).

The processor 201, the memory 202, and the transceiver 203 are connected through a communication line. The communication line may include a path to transmit information between the aforementioned components.

The processor 201 can be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits used to control the execution of the program of this application Circuit. In a specific implementation, as an embodiment, the processor 201 may also include multiple CPUs, and the processor 201 may be a single-CPU (single-CPU) processor or a multi-core (multi-CPU) processor. The processor here may refer to one or more devices, circuits, or processing cores for processing data (for example, computer program instructions).

The memory 202 may be a device having a storage function. For example, it can be read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), or other types that can store information and instructions Dynamic storage devices can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM), or other optical disk storage, optical disc storage ( Including compact discs, laser discs, optical discs, digital universal discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program codes in the form of instructions or data structures and can be stored by a computer Any other media taken, but not limited to this. The memory 202 may exist independently and is connected to the processor 201 through a communication line. The memory 202 may also be integrated with the processor 201.

The memory 202 is used to store computer-executable instructions for executing the solutions of the present application, and the processor 201 controls the execution. Specifically, the processor 201 is configured to execute computer-executable instructions stored in the memory 202, so as to implement the random access method described in the embodiment of the present application. Optionally, the computer execution instructions in the embodiments of the present application may also be referred to as application program codes or computer program codes, which are not specifically limited in the embodiments of the present application.

The transceiver 203 can use any device such as a transceiver to communicate with other devices or communication networks, such as Ethernet, radio access network (RAN), or wireless local area networks (WLAN) Wait. The transceiver 203 includes a transmitter (transmitter, Tx) and a receiver (receiver, Rx).

The output device 204 communicates with the processor 201, and can display information in a variety of ways. For example, the output device 204 may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector (projector) Wait.

The input device 205 communicates with the processor 201 and can accept user input in a variety of ways. For example, the input device 205 may be a mouse, a keyboard, a touch screen device, or a sensor device.

The network device 30 includes at least one processor (in FIG. 2 exemplarily includes a processor 301 for illustration), at least one transceiver (in FIG. 2 exemplarily includes a transceiver 303 as an example for illustration), and At least one network interface (in Fig. 2 one network interface 304 is included as an example for illustration). Optionally, the network device 30 may further include at least one memory (in FIG. 2 exemplarily, a memory 302 is included for illustration). Among them, the processor 301, the memory 302, the transceiver 303, and the network interface 304 are connected through a communication line. The network interface 304 is used to connect to the core network device through a link (for example, the S1 interface), or to connect with the network interface of other network devices through a wired or wireless link (for example, the X2 interface) (not shown in FIG. 2). The application embodiment does not specifically limit this. In addition, for the relevant description of the processor 301, the memory 302, and the transceiver 303, reference may be made to the description of the processor 201, the memory 202, and the transceiver 203 in the terminal device 20, which will not be repeated here.

With reference to the schematic structural diagram of the terminal device 20 shown in FIG. 2, as an example, FIG. 3 is a specific structural form of the terminal device 20 provided in an embodiment of the application.

Among them, in some embodiments, the functions of the processor 201 in FIG. 2 may be implemented by the processor 110 in FIG. 3.

In some embodiments, the function of the transceiver 203 in FIG. 2 may be implemented by the antenna 1, antenna 2, mobile communication module 150, wireless communication module 160, etc. in FIG. 3.

Among them, antenna 1 and antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in the terminal device 20 can be used to cover a single or multiple communication frequency bands. Different antennas can also be reused to improve antenna utilization. For example, antenna 1 can be multiplexed as a diversity antenna of a wireless local area network. In other embodiments, the antenna can be used in combination with a tuning switch.

The mobile communication module 150 may provide a wireless communication solution including 2G/3G/4G/5G and the like applied to the terminal device 20. The mobile communication module 150 may include at least one filter, switch, power amplifier, low noise amplifier (LNA), etc. The mobile communication module 150 can receive electromagnetic waves by the antenna 1, and perform processing such as filtering, amplifying and transmitting the received electromagnetic waves to the modem processor for demodulation. The mobile communication module 150 can also amplify the signal modulated by the modem processor, and convert it into electromagnetic waves for radiation via the antenna 1. In some embodiments, at least part of the functional modules of the mobile communication module 150 may be provided in the processor 110. In some embodiments, at least part of the functional modules of the mobile communication module 150 and at least part of the modules of the processor 110 may be provided in the same device.

The wireless communication module 160 can provide applications on the terminal device 20, including wireless local area networks (WLAN) (such as Wi-Fi networks), bluetooth (BT), global navigation satellite system, GNSS), frequency modulation (FM), near field communication (NFC), infrared technology (infrared, IR) and other wireless communication solutions. The wireless communication module 160 may be one or more devices integrating at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via the antenna 2, frequency modulates and filters the electromagnetic wave signals, and sends the processed signals to the processor 110. The wireless communication module 160 can also receive the signal to be sent from the processor 110, perform frequency modulation, amplify it, and convert it into electromagnetic wave radiation via the antenna 2. When the terminal device 20 is the first device, the wireless communication module 160 can provide a solution for NFC wireless communication applied to the terminal device 20, which means that the first device includes an NFC chip. The NFC chip can improve the NFC wireless communication function. When the terminal device 20 is the second device, the wireless communication module 160 can provide a NFC wireless communication solution applied to the terminal device 20, which means that the first device includes an electronic tag (such as radio frequency identification (RFID) tags). ). The NFC chip of other devices close to the electronic tag can perform NFC wireless communication with the second device.

In some embodiments, the antenna 1 of the terminal device 20 is coupled with the mobile communication module 150, and the antenna 2 is coupled with the wireless communication module 160, so that the terminal device 20 can communicate with the network and other devices through wireless communication technology. The wireless communication technology may include long term evolution (LTE), BT, GNSS, WLAN, NFC, FM, or IR technology. The GNSS may include global positioning system (GPS), global navigation satellite system (GLONASS), Beidou navigation satellite system (BDS), quasi-zenith satellite system (quasi -zenith satellite system, QZSS) or satellite-based augmentation systems (SBAS).

In some embodiments, the function of the memory 202 in FIG. 2 may be implemented by an external memory (such as a Micro SD card) connected to the internal memory 121 or the external memory interface 120 in FIG. 3.

In some embodiments, the function of the output device 204 in FIG. 2 may be implemented by the display screen 194 in FIG. 3. Among them, the display screen 194 is used to display images, videos, etc. The display screen 194 includes a display panel.

In some embodiments, the function of the input device 205 in FIG. 2 may be implemented by a mouse, a keyboard, a touch screen device, or the sensor module 180 in FIG. 3. Exemplarily, as shown in FIG. 3, the sensor module 180 may include, for example, a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, and a fingerprint sensor 180H. One or more of the temperature sensor 180J, the touch sensor 180K, the ambient light sensor 180L, and the bone conduction sensor 180M, which is not specifically limited in the embodiment of the present application.

In some embodiments, as shown in FIG. 3, the terminal device 20 may also include an audio module 170, a camera 193, an indicator 192, a motor 191, a button 190, a SIM card interface 195, a USB interface 130, a charging management module 140, One or more of the power management module 141 and the battery 142, where the audio module 170 can be connected to a speaker 170A (also called a “speaker”), a receiver 170B (also called a “handset”), a microphone 170C (also called a “microphone”, "Microphone") or the earphone interface 170D, etc., which are not specifically limited in the embodiment of the present application.

It can be understood that the structure shown in FIG. 3 does not constitute a specific limitation on the terminal device 20. For example, in other embodiments of the present application, the terminal device 20 may include more or fewer components than shown, or combine certain components, or split certain components, or arrange different components. The illustrated components can be implemented in hardware, software, or a combination of software and hardware.

In the following, in conjunction with FIGS. 1 to 3, taking the interaction between the network device 30 shown in FIG. 1 and any terminal device 20 as an example, the random access method provided in the embodiment of the present application will be described in an expanded manner.

It should be noted that the name of the message between each network element or the name of each parameter in the message in the following embodiments of this application is just an example, and other names may also be used in specific implementations. The embodiments of this application do not make specific details about this. limited.

It should be noted that, in the embodiment of the present application, the terminal device 1 and the terminal device 2 use the same preamble to initiate random access on the same time-frequency resource for description, where the terminal device 1 may also be referred to as the first terminal device. This is a unified description, and the following embodiments will not be repeated. It is understandable that the random access method provided in the embodiments of this application is not limited to scenarios where two terminal devices use the same preamble to initiate random access on the same time-frequency resource. When there are more than two terminal devices that use the same preamble When the code initiates random access on the same time-frequency resource, the random access method provided in the embodiment of this application is still applicable.

In a possible implementation manner, as shown in FIG. 4, the random access method provided in this embodiment of the present application includes the following steps:

S401. The terminal device 1 sends the first message 11 to the network device, and the terminal device 2 sends the first message 12 to the network device. Correspondingly, the network device receives the first message 11 from the terminal device 1, and the network device receives the first message 12 from the terminal device 2. Wherein, the first message 11 and the first message 12 both include the first preamble.

S402. The network device determines K TA values, where K is a positive integer greater than 1.

Optionally, in this embodiment of the application, the network device may determine K TA values in the following two ways:

Method 1: The network device determines K TA values through correlation peak detection.

For example, the network device uses the first preamble to perform correlation detection on multiple first messages, and after obtaining K correlation peaks, it determines the TA value corresponding to each of the K correlation peaks according to the positions of the K correlation peaks. .

Method 2: The network device determines K TA values based on the neural network.

For example, as shown in Figure 5, a network device can input a signal carrying multiple first messages into a first neural network (also called a preamble detection network) to obtain the number of terminal devices that use the first preamble (ie The number of terminal devices that send the first message), and then the number of signals carrying multiple first messages and the number of terminal devices that use the first preamble are input into the second neural network (also called the TA estimation network), and K A TA value. Among them, the first neural network may be a deep neural network (DNN), and the second neural network may be a convolutional neural network (convolutional neural network, CNN), which is not specifically limited in the embodiment of the present application.

Optionally, in this embodiment of the present application, the first neural network and the second neural network may be obtained through training of network equipment.

Exemplarily, the method of training the first neural network may be: setting the number of layers of the first neural network and the size of each layer (for example, the first neural network includes 4 layers, and the size of each layer is (128,64,32, 16)), then use random parameters to initialize the weights in the first neural network, use the signal carrying the first message received by the network device as the input of the first neural network, and output the correct first neural network (that is, the actual transmission The number of terminal devices with the first preamble) is used as the training label, and the first neural network can be trained by performing supervised learning.

Exemplarily, the method of training the second neural network may be: setting the number of layers of the second neural network and the size of each layer (for example, the second neural network includes 4 layers, and the size of each layer is (128, 64, 32, 16)), and then use random parameters to initialize the network weights, and use the signal carrying the first message received by the network device and the number of terminal devices that actually send the first preamble as the input of the second neural network, and the correct second The neural network output (that is, the actual TA value) is used as the training label, and the second neural network can be trained by performing supervised learning.

It should be noted that in this embodiment of the application, when the network device uses the above two methods to determine K TA values, the value of K is related to the number of first messages including the first preamble received by the network device, if If the multiple terminal devices that send the first message are not adjacent to each other, the value of K may be the same as the number of the first messages received by the network device. If there are multiple terminal devices that send the first message. Adjacent terminal equipment, the value of K may be less than the number of the first message received by the network equipment, where the adjacent terminal equipment can be understood as the geographical proximity of the terminal equipment. This embodiment only considers the situation where multiple terminal devices are not adjacent to each other, that is, after the network device receives the first message 11 and the first message 12, it can determine 2 TA values according to the first preamble, that is to say, the value of K The value is 2, and the situation where there are adjacent terminal devices among multiple terminal devices will be described in subsequent embodiments, and will not be repeated here.

Optionally, in this embodiment of the present application, after determining the K TA values, the network device may determine the TC-RNTI and the uplink authorization corresponding to each of the K TA values, where the uplink authorization instructs to send a third message For the resources used, the resources indicated by the uplink grant corresponding to each TA value are different.

S403: The network device sends a second message. Correspondingly, the terminal device 1 and the terminal device 2 receive the second message.

The second message includes K TA values, TC-RNTI and uplink grant corresponding to each of the K TA values.

Optionally, in a possible implementation manner, the second message includes K sub-messages, and each sub-message includes a TA value, the TC-RNTI corresponding to the TA value, and the uplink grant corresponding to the TA value . In another possible implementation manner, the second message includes K information groups, and each information group includes a TA value, a TC-RNTI corresponding to the TA value, and an uplink grant corresponding to the TA value. It can be understood that, in addition to the above-mentioned information, each sub-message or information group may also include other information, which is not limited in the embodiment of the present application.

Optionally, in this embodiment of the present application, after receiving the first message 11, the network device may calculate the random access wireless network temporary identifier corresponding to the terminal device 1 according to the time-frequency resource location of the first message 11. radio network temporary identifier, RA-RNTI), and use the RA-RNTI corresponding to terminal device 1 to perform cyclic redundancy calibration of downlink control information (downlink control information, DCI) in the physical downlink control channel (physical downlink control channel, PDCCH) The cyclic redundancy check (CRC) part is scrambled. The DCI is used to schedule the downlink data channel that carries the second message. In a possible implementation manner, the DCI may include Information about the position of the information group in the aforementioned downlink data channel (or second message). Optionally, the downlink data channel may be a physical downlink shared channel (PDSCH). At the same time, after receiving the first message 12, the network device can also calculate the RA-RNTI corresponding to the terminal device 2 according to the time-frequency resource location of the first message 12, and use the RA-RNTI corresponding to the terminal device 2 to compare the PDCCH The CRC part of another DCI is scrambled, where the DCI may include information used to determine the position of each sub-message or each information group in the aforementioned downlink data channel (or second message). In other implementation manners, the DCI may not include information used to determine the position of each sub-message or each information group in the aforementioned downlink data channel (or second message).

Optionally, in the embodiment of the present application, as shown in FIG. 6, when the terminal device 1 and the terminal device 2 receive the second message, they can use their corresponding RA-RNTI descrambling in the common search space (common search space). For the CRC part of each DCI, determine the DCI where the CRC that can pass the check after descrambling is located, and receive the second message at the PDSCH position indicated by the DCI.

S404: The terminal device 1 determines the first TA value from the K TA values, and the terminal device 2 determines the second TA value from the K TA values.

Optionally, in this embodiment of the application, the terminal device 1 may determine the reference TA value according to historical TA information, and determine the TA value closest to the reference TA value among the K TA values included in the second message as the first One TA value. Wherein, the reference TA value may be the TA value in the TA adjustment information issued by the terminal device 1 that is the last time the network device sent the second message; or the reference TA value may also be the terminal device 1 based on historical TA information. The averaged TA value; or, the reference TA value can also be obtained by other methods based on historical TA information.

Or, optionally, in the embodiment of the present application, if the terminal device 1 does not save historical TA information, after receiving the second message, the terminal device 1 randomly selects one TA among the K TAs, and the randomly selected one The TA value is used as the first TA value.

Optionally, in this embodiment of the application, after the terminal device 1 determines the first TA value, it can adjust TA according to the first TA value, and can also save the TC-RNTI corresponding to the first TA value, and the corresponding Sending a third message to the network device on the resource indicated by the uplink authorization.

The method for the terminal device 2 to determine the second TA value is similar to the method for the terminal device 1 to determine the first TA value. For details, reference may be made to the description of the terminal device 1 for determining the first TA value, which will not be repeated here. It should be noted that when there is a terminal device in terminal device 1 and terminal device 2 that does not save historical TA information, and a TA value is randomly selected from K TA values, the randomly selected TA value may be the same as another terminal device. The selected TA values are the same, that is, the first TA value and the second TA value may be the same, or, when the reference TA value determined by the terminal device 1 and the terminal device 2 are the same, the first TA value and the second TA value are also the same. When the terminal device 1 and the terminal device 2 send a third message to the network device on the same resource, the terminal device 1 and the terminal device 2 access according to the existing contention-based random access procedure, and the relevant procedure can refer to the prior art , I won’t repeat it here. In the embodiment of the present application, it is assumed that the first TA value is different from the second TA value.

S405. The terminal device 1 sends a third message 31 to the network device, and the terminal device 2 sends a third message 32 to the network device. Correspondingly, the network device receives the third message 31 from the terminal device 1, and the network device receives the third message 32 from the terminal device 2.

The third message 31 uses the TC-RNTI corresponding to the first TA value to be scrambled, and the third message 31 includes the identification of the terminal device 1. The third message 32 is scrambled with the TC-RNTI corresponding to the second TA value, and the third message 32 includes the identification of the terminal device 2.

Optionally, in the embodiment of the present application, as shown in FIG. 6, the terminal device 1 sends a third message 31 to the network device on the resource indicated by the uplink authorization corresponding to the first TA value, and the terminal device 2 is in the second TA value. The third message 32 is sent to the network device on the resource indicated by the corresponding uplink grant. Correspondingly, the network device receives the third message 31 on the resource indicated by the uplink grant corresponding to the first TA value, and after receiving the third message 32 on the resource indicated by the uplink grant corresponding to the second TA value, demodulates the third message. Message 31 and the third message 32. In the embodiment of this application, the TA values determined by the terminal device 1 and the terminal device 2 are different, and the resources indicated by the uplink authorization corresponding to each TA value are different. Therefore, the terminal device 1 and the terminal device 2 share different resources on different resources. The network device sends the third message, and further, the network device can successfully demodulate the third message 31 and the third message 32, and send a fourth message for each third message successfully demodulated by performing step S406.

S406: The network device sends a fourth message 41 to the terminal device 1, and the network device sends a fourth message 42 to the terminal device 2. Correspondingly, the terminal device 1 receives the fourth message 41 from the network device, and the terminal device 2 receives the fourth message 42 from the network device.

The fourth message includes the access resource allocated by the network device for the terminal device corresponding to the terminal identifier included in the third message successfully demodulated, that is, the fourth message 41 includes the access resource allocated by the network device for the terminal device 1, The fourth message 42 includes the access resources allocated by the network device to the terminal device 2. The downlink data channel carrying the fourth message is scheduled by DCI. The DCI uses the TC-RNTI scrambling corresponding to the determined TA value obtained by the terminal equipment from the K TA values, that is, used to schedule the downlink data channel carrying the fourth message 41 The DCI is scrambled using the TC-RNTI corresponding to the first TA value, and the DCI used for scheduling the downlink data channel carrying the fourth message 42 is scrambled using the TC-RNTI corresponding to the second TA value. Optionally, the aforementioned downlink data channel may be PDSCH.

Optionally, in this embodiment of the application, after the network device demodulates the third message 31, it may allocate access resources for the terminal device 1 corresponding to the identifier of the terminal device 1 included in the third message 31, and use the first TA value to correspond to The TC-RNTI scrambles the CRC part of the DCI in the PDCCH, where the DCI is used to schedule the downlink data channel carrying the fourth message 41. Correspondingly, the terminal device 1 may receive the fourth message 41 from the network device according to the TC-RNTI corresponding to the first TA value. Exemplarily, the terminal device 1 uses the TC-RNTI corresponding to the first TA value saved in step S404 in the general search space to descramble the CRC parts of multiple DCIs, and find the DCI where the CRC that can pass the check after descrambling is located. , And receive the downlink data channel carrying the fourth message 41 according to the DCI, and obtain the fourth message 41 from the received downlink data channel. The manners of the network device to demodulate the third message 32 and the fourth message 42 are respectively similar to the manners of demodulating the third message 31 and sending the fourth message 41, and the manner of the terminal device 2 receiving the fourth message 42 is the same as that of the terminal device 1. The manner of receiving the fourth message 41 is similar, and will not be repeated here.

Optionally, in the embodiment of the present application, the fourth message further includes a contention resolution identifier CRID, which indicates a terminal device whose contention is successful. Optionally, the contention resolution identifier may be in the third message successfully demodulated The identity of the terminal device can also be understood as the identity of the terminal device that succeeds in the competition. Since multiple terminal devices using the same preamble are not adjacent to each other, and the first TA value and the second TA value are different, both terminal device 1 and terminal device 2 can access successfully, therefore, the fourth message 41 The contention resolution identification included in the corresponding to the identification of the terminal device 1, and the contention resolution identification included in the fourth message 42 corresponds to the identification of the terminal device 2. Therefore, after the terminal device 1 receives the fourth message 41, by comparing the CRID included in the fourth message 41 with the identification of the terminal device 1, it can be determined that the terminal device 1 is successfully connected, and the terminal device 1 can be the terminal device in the network device. The device 1 sends an acknowledgement (acknowledgement, ACK) on the access resources allocated by the device 1, and uses the TC-RNTI corresponding to the first TA value as the cell radio network temporary identifier (C-RNTI) for subsequent transmission. After receiving the fourth message 42, the terminal device 2 can send HARQ or ACK on the access resource allocated by the network device for the terminal device 2, and use the TC-RNTI corresponding to the second TA value as the C-RNTI for subsequent transmission .

In the foregoing embodiment, the number of TA values determined by the network device is the same as the number of terminal devices that send the first message. Optionally, in the embodiment of this application, there are also multiple adjacent terminal devices (geographical location A scenario where multiple nearby terminal devices use the same preamble to initiate random access. In this scenario, the number of TA values determined by the network device may be different from the number of terminal devices that send the first message. For this scenario, in the embodiment of the present application, the geographical location of the terminal device 3 and the terminal device 1 are close, and the terminal device 3 and the terminal device 1 both use the first preamble to initiate random access as an example. It is understandable that when there are multiple terminal devices that are geographically close and use the same preamble to initiate random access, the random access method provided in the embodiment of the present application is still applicable. In this scenario, in the random access method shown in FIG. 4 provided by the embodiment of the present application:

Optionally, step S401 further includes: the terminal device 3 sends the first message 13 to the network device. Correspondingly, the network device receives the first message 13 from the terminal device 3.

Optionally, in step S402, when the network device use mode 1 determines the TA value, since the location of the terminal device 1 and the terminal device 3 are close, the first message 11 and the second message 12 arrive at the relevant peak of the network device very close, and the network device cannot Therefore, the network device will consider that there is only one correlation peak at this position, and can only determine a TA value based on the position of the one correlation peak. Therefore, the network device can only determine 2 TA values.

Optionally, when the network device uses the second method to determine the TA value, because the location of the terminal device 1 and the terminal device 3 are close, and the accuracy of the first neural network and the second neural network may not be high, the network device may only determine 2 TA values. However, when the accuracy of the first neural network and the second neural network device is sufficiently high, it is not ruled out that the network device may determine 3 TA values in this scenario. At this time, the terminal device 1, the terminal device 2, and the terminal device 3 can compete successfully. In the embodiment of the present application, an example is described by taking the network device to determine two TA values.

Optionally, step S403 further includes: the terminal device 3 receives the second message, where the related description of the second message can refer to the description part of the second message in the foregoing embodiment, which will not be repeated here.

Optionally, step S404 further includes: the terminal device 3 determines a third TA value from the K TA values. Among them, the third TA value may have the following two situations:

Case 1: The third TA value is the same as the first TA value. When the terminal device 3 determines the TA value according to the historical TA information, if the reference TA value determined by the terminal device 3 and the terminal device 1 is the same, the third TA value is the same as the first TA value; or when the terminal device 3 randomly determines the TA value , The third TA value randomly selected by the terminal device 3 may be the same as the first TA value.

Case 2: The third TA value is the same as the second TA value. When the terminal device 3 determines the TA value according to the historical TA information, if the reference TA value determined by the terminal device 3 and the terminal device 2 is the same, the third TA value and the second TA value are the same; or when the terminal device 3 randomly determines the TA value , The third TA value randomly selected by the terminal device 3 may be the same as the second TA value.

Optionally, step S405 further includes: the terminal device 3 sends a third message 33 to the network device, and the third message 33 includes the identifier of the terminal device 3. Correspondingly, the network device receives the third message from the terminal device 3.

Wherein, since the third TA value determined by the terminal device 3 may be the same as the first TA value determined by the terminal device 1, both the terminal device 1 and the terminal device 3 send on the resource indicated by the uplink grant corresponding to the first TA value The third news. After the network device receives the third message 31 and the third message 33 on the resource, it may only successfully demodulate a third message (take the successful demodulation of the third message 31 as an example), and obtain a successfully demodulated first message. The identifier of the terminal device included in the third message, that is, the identifier of the terminal device 1 included in the third message 31 is acquired.

Optionally, since the network device only successfully demodulates the third message 31, the network device will only send the fourth message 41 for the third message 31, and the contention resolution identifier included in the fourth message 41 is successfully resolved by the network device. The terminal identification included in the adjusted third message corresponds to, that is, the contention resolution identification in the fourth message 41 corresponds to the identification of the terminal device 1. However, since the terminal device 3 and the terminal device 1 use the same TA value, the terminal device 3 can also receive the fourth message 41 according to the TC-RNTI corresponding to the first TA value. In this scenario, after the terminal device 3 receives the fourth message 41, it can be determined that the contention resolution identifier does not correspond to the identifier of the terminal device 3, and then it can be determined that the terminal device 3 fails to access, and terminates random access or transfers to the next time Random access. That is, in this scenario, the terminal device 1 and the terminal device 2 are successfully connected, and the terminal device 3 fails to access. It can be understood that if the network device successfully demodulates the third message 33, the terminal device 3 and the terminal device 2 are successfully connected, and the terminal device 1 fails to access. This example is not described in detail in the embodiment of the present application.

Alternatively, the third TA value determined by the terminal device 3 may be the same as the second TA value determined by the terminal device 2. Similarly, when the network device successfully demodulates the third message 32, the terminal device 1 and the terminal device 2 are successfully connected. The terminal device 3 fails to access. When the network device successfully demodulates the third message 33, the terminal device 1 and the terminal device 3 successfully access, and the terminal device 2 fails to access. The related process can refer to the description when the third TA value is the same as the first TA value, which is not repeated here.

Based on the random access method provided in the embodiments of the present application, after receiving multiple first messages, the network device can determine multiple TA values, as well as the TC-RNTI and uplink authorization corresponding to each TA value, and perform the It is sent in the second message. Therefore, after multiple terminal devices that use the same preamble to initiate random access receive the second message, they can determine a TA value from the K TA values, and the uplink authorization corresponding to the TA value Send a third message to the network device on the indicated resource. In addition, because the resources indicated by the uplink authorization corresponding to each TA value are different, the network device can demodulate the third message sent by each terminal device, and send a fourth message for each third message. The fourth message includes The access resources allocated to the terminal device that sends the third message, so that multiple terminal devices using the same preamble can continue to send signals on their corresponding access resources. Therefore, compared with the prior art, the contention-based random access The access scheme can enable multiple terminal devices that select the same preamble to access at the same time, which improves the access efficiency of the terminal devices.

It should be noted that although the random access method as shown in FIG. 4 provided in the foregoing embodiment of the present application is based on four-step random access (4-step-RACH), it is not limited to use in four-step random access. It is understood that the random access method shown in FIG. 4 provided in the foregoing embodiment of the present application can be extended to two-step random access (2-step-RACH). For example, after a network device receives a message A that includes the same preamble and uplink data sent by multiple terminal devices, it can execute the above steps S402, S403, and S406 to determine K TA values and send a message B. The message B includes K TA value, and TC-RNTI and access resources corresponding to each of the K TA values. After receiving the message B, the terminal device may perform step S404 above to determine a TA value from the K TA values for TA adjustment, and continue to send messages to the network device on the access resource corresponding to the TA value. Based on this, since the TA values determined by multiple terminal devices may be different, there may be multiple terminal devices successfully connected, thereby improving the access efficiency of the terminal devices.

Wherein, the actions of the network device in the above steps S401 to S406 can be executed by the processor 301 in the network device 30 shown in FIG. 2 calling the application code stored in the memory 302 to instruct the network device to execute. In the above steps S401 to S406 The action of the terminal device may be called by the processor 201 in the terminal device 20 shown in FIG. 2 to call the application code stored in the memory 202 to instruct the terminal device to execute, and this embodiment does not impose any limitation on this.

In another possible implementation manner, as shown in FIG. 7, another random access method provided in this embodiment of the present application, the random access method includes the following steps:

S701. The terminal device 1 sends the first message 11 to the network device, and the terminal device 2 sends the first message 12 to the network device. Accordingly, the network device receives the first message 11 from the terminal device 1 and the network device receives the first message 11 from the terminal device 2. First message 12. Wherein, the first message 11 and the first message 12 both include the first preamble.

S702. The network device determines the first TA value according to the first preamble.

Wherein, in step S702, the processing method of the network device is the same as the processing method after the network device receives multiple first messages in the prior art, and the related description can refer to the prior art, which will not be repeated here.

S703: The network device sends a second message. Correspondingly, the terminal device 1 and the terminal device 2 receive the second message. The second message includes the first TC-RNTI and the first uplink grant corresponding to the first TA value. For the relevant description of the terminal device 1 and the terminal device 2 receiving the second message, refer to the foregoing step S403, which will not be repeated here.

Optionally, the second message in the embodiment of the present application may further include a first TA value, and the terminal device 1 and the terminal device 2 may perform TA adjustment according to the first TA value after receiving the second message.

S704. The terminal device 1 sends a third message 31 to the network device, and the terminal device 2 sends a third message 32 to the network device. Correspondingly, the network device receives the third message 31 from the terminal device 1, and the network device receives the third message 32 from the terminal device 2. Wherein, the third message 31 and the third message 32 are both scrambled by the first TC-RNTI, the third message 31 includes the identification of the terminal device 1, and the third message 32 includes the identification of the terminal device 2.

It should be noted that in this embodiment of the application, since the second message received by multiple terminal devices only includes the first uplink authorization, the multiple terminal devices all send to the network device on the resource indicated by the first uplink authorization. The third message. After the network device receives multiple third messages on the resource, it can successfully demodulate K third messages. Each of the K third messages includes an identifier of a terminal device, and K is greater than A positive integer of 1. Among them, the value of K may be the same as the number of terminal devices that send the third message, that is, the network device may successfully demodulate all the third messages sent by multiple terminal devices, and the value of K may also be smaller than that of the third message. The number of terminal devices, that is, the network device successfully demodulates the third message sent by some of the multiple terminal devices. In the embodiment of the present application, the value of K is the same as the number of terminal devices sending the third message as an example for numerical description, that is, the network device can successfully demodulate the third message 31 and the third message 32.

S705: The network device sends a fourth message. Correspondingly, the terminal device 1 receives the fourth message from the network device, and the terminal device 2 receives the fourth message from the network device.

The fourth message includes K CRIDs and access resources corresponding to each CRID of the K CRIDs. Each CRID corresponds to an identifier of a terminal device. The downlink data channel carrying the fourth message is scheduled by DCI. The DCI uses the first TC-RNTI for scrambling. Optionally, the downlink data channel may be PDSCH.

Optionally, in a possible implementation manner, the fourth message includes K sub-messages, and each sub-message includes a CRID and information indicating the access resource corresponding to the CRID value. In another possible implementation manner, the fourth message includes K information groups, and each information group includes a CRID and information indicating the access resource corresponding to the CRID value. It can be understood that, in addition to the above-mentioned information, each sub-message or information group may also include other information, which is not limited in the embodiment of the present application.

Optionally, in the embodiment of the present application, after the network device successfully demodulates the K third messages, the identification of the terminal device included in the successfully demodulated third message may correspond to a contention resolution identification CRID, for example, Use the identification of the terminal device as the CRID, and allocate access resources for the terminal device corresponding to each CRID, and use the first TC-RNTI to scramble the CRC part of the DCI in the PDCCH, where the DCI is used to schedule the fourth bearer The downlink data channel of the message. In a possible implementation manner, the DCI may include information for determining the position of each sub-message or information group in the aforementioned downlink data channel (or the fourth message). Correspondingly, as shown in FIG. 8, the terminal device 1 may receive the fourth message from the network device according to the first TC-RNTI. Exemplarily, the terminal device 1 uses the first TC-RNTI in the general search space to descramble the CRC parts of multiple DCIs, finds the DCI where the CRC that can pass the check after descrambling is located, and receives the fourth message according to the DCI. To obtain the fourth message from the received downlink data channel. In a possible implementation manner, the terminal device determines the position of each sub-message or information group according to the information used in DCI to determine the position of each sub-message or information group in the aforementioned downlink data channel (or the fourth message), and then obtains The information contained in each information group. In another embodiment, the DCI may not include information used to determine the position of each sub-message or information group in the aforementioned downlink data channel (or the fourth message). For example, the aforementioned sub-messages or information groups are in the aforementioned uplink. The position in the data channel is determined by a preset rule. After receiving the above-mentioned data channel, the terminal device can determine the position of each sub-message or information group according to the preset rule. In this case, in the DCI There is no need to include information for determining the position of each sub-message or information group in the aforementioned downlink data channel. The manner in which the terminal device 2 receives the fourth message is similar to the manner in which the terminal device 1 receives the fourth message, and will not be repeated here.

Optionally, in this embodiment of the present application, after the terminal device 1 receives the fourth message, if there is a CRID corresponding to the identity of the terminal device 1 in the K CRIDs, the terminal device 1 sends on the access resource corresponding to the CRID ACK; or, if there is no CRID corresponding to the identity of the terminal device 1 in the K CRIDs, the terminal device 1 determines that this access fails, and terminates the random access or transfers to the next access. The processing method after the fourth message received by the terminal device 2 is similar to that of the terminal device 1, and will not be repeated here.

Optionally, in this embodiment of the present application, the fourth message may also include the TA value and TC-RNTI corresponding to each CRID. The TA value corresponding to each CRID may be obtained from the K third messages after the network device successfully demodulates the K third messages. Optionally, the network device may estimate K TA values based on the reference signal (demodulation reference signal, DMRS) carried in the K third messages; or, the network device may determine K TA values after receiving multiple first messages. In addition to the first TA value, multiple TA values may be determined according to the method 1 or method 2 in step S402 and the multiple TA values can be stored. After the network device successfully demodulates K third messages and determines K CRIDs , You can assign the multiple TA values to the terminal device corresponding to each CRID.

Optionally, when the network device assigns multiple TA values to the terminal devices corresponding to the K CRIDs, the TA value determined according to the first or second method is more accurate than the TA value determined according to the third message. It is possible to first estimate K TA values based on the K third messages, and then assign the TA value closest to the estimated TA value based on the third message among the multiple TA values to the CRID determined based on the third message. For example, the network device determines multiple TA values of 1.7 and 9.6 according to Method 1 or Method 2, the TA value determined by the third message 31 is 1.8, and the CRID determined by the third message 31 is CRID 1, according to the first The TA value determined by the third message 32 is 9.4, and the CRID determined according to the third message 31 is CRID 2. When the network device assigns multiple TA values to each CRID, it will assign 1.7 to CRID 1, and 9.6 to CRID 2.

Optionally, in this embodiment of the present application, after the terminal device receives the fourth message including the TA value corresponding to each CRID, if there is a CRID corresponding to its identifier in the K CRIDs, the terminal device may TA value is TA adjusted. Since the network device only delivers the first TA value in the second message, the first TA value is the TA value corresponding to one of the multiple terminal devices, so for other terminal devices, the first TA value The TA after TA adjustment is inaccurate, but the TA value corresponding to each CRID in the fourth message is obtained by the network device according to the first message or the third message sent by the terminal device corresponding to the CRID, so for each CRID For the corresponding terminal device, the TA adjusted by using the TA value corresponding to the CRID is more accurate, which improves the accuracy of TA adjustment.

Based on the random access method provided in the embodiments of the present application, since the network device can successfully demodulate K third messages after receiving the third message, and determine the terminal included in each third message in the K third messages The device identification corresponds to a CRID, and K CRIDs and the access resources corresponding to each CRID are sent in the fourth message. Therefore, multiple terminal devices using the same preamble can determine according to their identification after receiving the fourth message Corresponding to a CRID, and continue to send signals on the access resource corresponding to the CRID. Therefore, compared with the prior art competition-based random access scheme, multiple terminal devices that select the same preamble can access at the same time. Improve the access efficiency of terminal equipment.

Wherein, the actions of the network device in the above steps S701 to S705 can be executed by the processor 301 in the network device 30 shown in FIG. 2 calling the application program code stored in the memory 302 to instruct the network device to execute. In the above steps S701 to S705 The actions of the terminal device (including terminal device 1 and terminal device 2) can be executed by the processor 201 in the terminal device 20 shown in FIG. 2 calling the application program code stored in the memory 202 to instruct the terminal device to execute. There are no restrictions.

Wherein, in the embodiment shown in FIG. 7, multiple terminal devices send the third message to the network device on the same resource. Although the network device may successfully demodulate the third message sent by the multiple terminal devices, for the network device , The complexity of demodulating multiple third messages on the same time-frequency resource is relatively high. Based on this, in the random access method shown in FIG. 7 provided by the embodiment of the present application, the network device may indicate to the terminal device whether there is a collision of the third message on the resource indicated by the first uplink authorization, that is, in the first uplink authorization. Whether there are multiple terminal devices on the resources indicated by the uplink authorization to send the third message to the network device, so that the terminal device can adjust the way of sending the third message according to the instruction of the network device.

Optionally, the network device may determine whether there is a collision on the resource indicated by the first uplink grant by determining the TA value. After step S701, the network device may determine the TA value by the method in step S402 above, if it is determined If the number of TA values is greater than 1, the network device determines that there is a collision on the resource; otherwise, the network device determines that there is no collision on the resource. After the network device determines whether there is a collision on the resource, it can indicate to the terminal device whether there is a collision on the resource.

Optionally, the network device may include indication information in the second message in step S703 to indicate whether there are multiple terminal devices on the resource indicated by the first uplink grant to send the third message to the network device. Wherein, the indication information may be characterized by bits. For example, when the value of the bit is 0, it means that there is no collision, and when the value of the bit is 1, it means that there is a collision; or, the indication information may specifically be in the second message. The included value of the first TC-RNTI. When the value of the first TC-RNTI is in the preset first range, it indicates that there is no collision, and when the value of the first TC-RNTI is in the preset second range, it indicates that there is a collision. . Or, optionally, the network device may use the position where the network device sends the second message in step S703 to indicate whether there are multiple terminal devices on the resource indicated by the first uplink authorization to send the third message to the network device. For example, when the network device sends the second message on the time-frequency resource location 1, it indicates that there is no collision, and when the network device sends the second message on the time-frequency resource location 2 there is a collision. Further, the indication information may also indicate the number of users who send the third message to the network device on the resource indicated by the first uplink grant. For example, when the indication information is characterized by a bit value, the value of the bit bit is 0 It means that there is no collision. When the value of the bit is X, it means that there are X users sending the third message to the network device on the resource indicated by the first uplink authorization. It should be noted that, because the embodiment of the application solves the access problem when multiple terminal devices use the same preamble, the network device indicates to the terminal device that there are multiple terminal devices on the resource indicated by the first uplink authorization. Send the third message.

In addition, since multiple different terminal devices send the same preamble on the same time-frequency resource, and the TA values included in the second message received by the multiple terminal devices are all the first TA values, the multiple The terminal devices all send a third message to the network device on the resource indicated by the first uplink grant corresponding to the first TA value. Based on this, the network device indicates to the terminal device whether there is a collision of the third message on the resource indicated by the first uplink authorization, which can also be understood as the network device indicating to the terminal device whether there are multiple terminal devices on the same time-frequency resource Send the same preamble to the network device. Optionally, the network device may also include indication information in the second message in the above step S703 to indicate whether there are multiple terminal devices sending the same preamble to the network device on the same time-frequency resource. The indication information may be passed Bit characterization, or the indication information may specifically be the value of the first TC-RNTI included in the second message. Alternatively, the network device may also use the position where the network device sends the second message in step S703 to indicate whether there are multiple terminal devices that send the same preamble to the network device on the same time-frequency resource. Further, the indication information may also identify the number of terminal devices that send the same preamble to the network device on the same time-frequency resource. For the specific description of the indication manner, reference may be made to the manner in which the network device indicates to the terminal device whether there is a collision of the third message, which is not repeated here.

Optionally, in the above step S704, when the terminal device 1 receives the above instruction and sends the third message 31 to the network device, the third message 31 may be processed in a non-orthogonal processing manner, and then the processed third message 31 may be processed. Message 31 is sent to the network device. The non-orthogonal processing method may be pre-configured by the network device. When the terminal device 1 sends the third message 31, it may use the non-orthogonal processing method pre-configured with the network device or selected from the non-orthogonal parameter pool. The corresponding non-orthogonal parameters perform non-orthogonal processing on the third message 31, where the non-orthogonal parameters include one or more of a spreading sequence, an interleaving pattern, or a multi-dimensional constellation modulation codebook, and the non-orthogonal processing method Including one or more of using spreading sequence spreading, using interleaving pattern interleaving, or using multi-dimensional constellation modulation codebook modulation. The manner in which the terminal device 2 sends the third message 32 is similar to the manner in which the terminal device 1 sends the third message 31, and will not be repeated here. Correspondingly, the network device can demodulate the third message in a corresponding manner. Optionally, the network device can determine a non-orthogonal parameter for processing the third message, and succeed in the resource indicated by the first uplink grant according to the non-orthogonal parameter. Demodulate K third messages.

Based on this scheme, since the terminal device uses the non-orthogonal parameters pre-configured by the network device or selected from the non-orthogonal parameter pool to perform non-positive processing on the third message when sending the third message, the non-orthogonal parameters can be used The difference in distinguishing multiple terminal devices that send the third message reduces the complexity of the network device when demodulating multiple third messages on the resources indicated by the first uplink authorization, and improves the performance of the network device in demodulating the third message .

It should be noted that in the above-mentioned embodiment, after the terminal device receives the indication of the collision of the network device on the same resource, it sends the third message after non-orthogonal processing to the network device. It is understandable that even if the terminal device does not After receiving an instruction from the network device, the third message can also be sent to the network device after non-orthogonal processing to improve the performance of the network device in demodulating the third message. At this time, the terminal device needs to send a message to the network device in advance to notify it The non-orthogonal processing method and the non-orthogonal parameters used so that the network device can use the same demodulation method to demodulate the third message

It can be understood that, in the above embodiments, the methods and/or steps implemented by terminal devices can also be implemented by components (such as chips or circuits) that can be used in terminal devices, and the methods and/or steps implemented by network devices can also It can also be implemented by components (such as chips or circuits) that can be used in network devices.

The foregoing mainly introduces the solution provided by the embodiment of the present application from the perspective of interaction between various network elements. Correspondingly, an embodiment of the present application also provides a communication device, which is used to implement the foregoing various methods. The communication device may be the terminal device in the foregoing method embodiment, or a device including the foregoing terminal device, or a component that can be used in the terminal device; or, the communication device may be the network device in the foregoing method embodiment, or include the foregoing A device of a network device, or a component that can be used in a network device. It can be understood that, in order to realize the above-mentioned functions, the communication device includes hardware structures and/or software modules corresponding to each function. Those skilled in the art should easily realize that in combination with the units and algorithm steps of the examples described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

The embodiments of the present application may divide the communication device into functional modules according to the foregoing method embodiments. For example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The above-mentioned integrated modules can be implemented in the form of hardware or software functional modules. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.

For example, take the communication device as the network device in the foregoing method embodiment as an example. FIG. 9 shows a schematic structural diagram of a network device 90. The network device 90 includes a processing module 901 and a transceiver module 902. The transceiver module 902 may also be referred to as a transceiver unit to implement sending and/or receiving functions, and may be, for example, a transceiver circuit, transceiver, transceiver or communication interface.

In a possible implementation manner, the transceiver module 902 is configured to receive multiple first messages, and each of the multiple first messages includes a first preamble. The processing module 901 is used to determine K TA values, where K is a positive integer greater than 1. The transceiver module 902 is further configured to send a second message, the second message including the K TA values, TC-RNTI and uplink grant corresponding to each of the K TA values. The transceiver module 902 is further configured to receive a third message from the first terminal device on the resource indicated by the uplink grant corresponding to the first TA value. The third message is scrambled by the TC-RNTI corresponding to the first TA value. The third message includes the identity of the first terminal device, where the first TA value is any TA value among the K TA values. The transceiver module 902 is further configured to send a fourth message to the first terminal device. The fourth message includes the access resource allocated by the network device. The downlink data channel carrying the fourth message is scheduled by the downlink control information DCI. The DCI uses the first The TC-RNTI corresponding to the TA value is scrambled.

Optionally, a processing module 901, configured to determine K TA values, includes: a processing module 901, configured to input a signal carrying the foregoing multiple first messages into the first neural network to obtain information about the terminal device using the first preamble Number. The processing module 901 is further configured to input the number of terminal devices and the signal carrying the multiple first messages into the second neural network to obtain K TA values.

In another possible implementation manner, the transceiver module 902 is configured to receive multiple first messages, and each of the multiple first messages includes a first preamble. The processing module 901 is further configured to determine the first TA value according to the first preamble. The transceiver module 902 is further configured to send a second message, the second message including the first TA value, and the first TC-RNTI and the first uplink grant corresponding to the first TA value. The processing module 901 is configured to successfully demodulate K third messages scrambled with the first TC-RNTI on the resources indicated by the first uplink grant, and each of the K third messages includes The identification of a terminal device, K is a positive integer greater than 1. The transceiver module 902 is further configured to send a fourth message. The fourth message includes K contention resolution identifiers CRIDs and access resources corresponding to each of the K CRIDs, where each CRID corresponds to K The identifier of the terminal device in one of the third messages, the downlink data channel carrying the fourth message is scheduled by the downlink control information DCI, and the DCI is scrambled by using the above-mentioned first TC-RNTI.

Optionally, the processing module 901 is further configured to successfully demodulate the K third messages scrambled by the first TC-RNTI on the resource indicated by the first uplink grant, and includes: a processing module 901, configured to determine Non-orthogonal parameters. The non-orthogonal parameters include one or more of the following: spreading sequence, interleaving pattern, or multi-dimensional constellation modulation codebook. The processing module 901 is further configured to successfully demodulate the K third messages according to the non-orthogonal parameter on the resource indicated by the first uplink grant.

Among them, all relevant content of each step involved in the above method embodiment can be cited in the function description of the corresponding function module, and will not be repeated here.

In this embodiment, the network device 90 is presented in the form of dividing various functional modules in an integrated manner. The "module" here can refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuit, and/or other devices that can provide the above-mentioned functions. In a simple embodiment, those skilled in the art can imagine that the network device 90 may take the form of the network device 30 shown in FIG. 2.

For example, the processor 301 in the network device 30 shown in FIG. 2 may invoke the computer execution instructions stored in the memory 302 to make the network device 30 execute the random access method in the foregoing method embodiment.

Specifically, the functions/implementation process of the processing module 901 and the transceiver module 902 in FIG. 9 can be implemented by the processor 301 in the network device 30 shown in FIG. 2 calling the computer execution instructions stored in the memory 302. Alternatively, the function/implementation process of the processing module 901 in FIG. 9 can be implemented by the processor 301 in the network device 30 shown in FIG. 2 calling a computer execution instruction stored in the memory 302, and the function of the transceiver module 902 in FIG. 9 /The implementation process can be implemented by the transceiver 303 in the network device 30 shown in FIG. 2.

Since the network device 90 provided in this embodiment can perform the above-mentioned random access method, the technical effects that can be obtained can refer to the above-mentioned method embodiment, and will not be repeated here.

Or, for example, taking the communication device as the terminal device in the foregoing method embodiment as an example. FIG. 10 shows a schematic structural diagram of a terminal device 100. The terminal device 100 includes a processing module 1001 and a transceiver module 1002. The transceiver module 1002 may also be referred to as a transceiver unit to implement sending and/or receiving functions, for example, it may be a transceiver circuit, transceiver, transceiver or communication interface.

In a possible implementation, the transceiver module 1002 is configured to send a first message to a network device, where the first message includes a first preamble. The transceiver module 1002 is further configured to receive a second message from the network device, the second message including K TA values, and TC-RNTI and uplink grant corresponding to each of the K TA values, K It is a positive integer greater than 1. The processing module 1001 is configured to determine the first TA value from the K TA values. The transceiver module 1002 is further configured to send a third message to the network device on the resource indicated by the uplink authorization corresponding to the first TA value. The third message is scrambled by the TC-RNTI corresponding to the first TA value. The message includes the identification of the terminal device. The transceiver module 1002 is further configured to receive a fourth message from the network device according to the TC-RNTI corresponding to the first TA value, where the fourth message includes the access resource allocated by the network device to the terminal device.

Optionally, the processing module 1001 is further configured to determine the first TA value from the K TA values, including: the processing module 1001 is configured to determine the reference TA value according to the historical TA information of the terminal device. The processing module 1001 is further configured to determine the TA value closest to the reference TA value among the K TA values as the first TA value.

Optionally, the processing module 1001 is further configured to determine the first TA value from the K TA values, including: the processing module 1001 is configured to randomly select a TA value from the K TA values. The processing module 1001 is further configured to determine the randomly selected TA value as the first TA value.

Optionally, the fourth message further includes a contention resolution identification CRID. If the CRID corresponds to the identification of the first terminal device, the processing module 1001 is further configured to send an ACK to the network device on the access resource included in the fourth message; Or, if the CRID does not correspond to the identity of the first terminal device, the processing module 1001 is also used to terminate random access or switch to the next random access.

In another possible implementation manner, the processing module 1001 is configured to generate a first message, and the first message includes a first preamble. The transceiver module 1002 is configured to send the first message to the network device, and the transceiver module 1002 is also configured to receive a second message from the network device. The second message includes a first TA value and a message corresponding to the first TA value. The first TC-RNTI and the first uplink grant. The processing module 1001 is further configured to generate a third message that uses the first TC-RNTI to be scrambled, and the third message includes the identifier of the first terminal device. The transceiver module 1002 is configured to send the third message to the network device on the resource indicated by the first uplink authorization. The transceiver module 1002 is further configured to receive a fourth message from the network device according to the first TC-RNTI. The fourth message includes K contention resolution identifiers CRIDs, and access resources corresponding to each CRID of the K CRIDs, where each CRID corresponds to one of the K third messages successfully demodulated by the network device. The identification of the terminal device included in the third message, K is a positive integer greater than 1.

Optionally, the foregoing fourth message further includes the TA value corresponding to each CRID. If the K CRIDs include the first CRID corresponding to the identification of the terminal device, the processing module 1001 is further configured to perform TA adjustment according to the TA corresponding to the first CRID.

Optionally, the transceiver module 1002 is further configured to send a third message to the network device on the resource indicated by the first uplink authorization, including: the transceiver module 1002, configured to send a third message to the network device on the resource indicated by the first uplink authorization The network device sends the third message processed by the non-orthogonal processing method, the non-orthogonal processing method includes one or more of the following: using spreading sequence spreading, using interleaving pattern interleaving, or using multi-dimensional constellation modulation codebook modulation .

In this embodiment, the terminal device 100 is presented in the form of dividing various functional modules in an integrated manner. The "module" here can refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuit, and/or other devices that can provide the above-mentioned functions. In a simple embodiment, those skilled in the art can imagine that the terminal device 100 may take the form of the terminal device 20 shown in FIG. 2.

For example, the processor 201 in the terminal device 20 shown in FIG. 2 may invoke the computer execution instruction stored in the memory 202 to make the terminal device 20 execute the random access method in the foregoing method embodiment.

Specifically, the function/implementation process of the processing module 1001 and the transceiver module 1002 in FIG. 10 may be implemented by the processor 201 in the terminal device 20 shown in FIG. 2 calling a computer execution instruction stored in the memory 202. Alternatively, the function/implementation process of the processing module 1001 in FIG. 10 can be implemented by the processor 201 in the terminal device 20 shown in FIG. 2 calling a computer execution instruction stored in the memory 202, and the function of the transceiver module 1002 in FIG. /The implementation process can be implemented by the transceiver 203 in the terminal device 20 shown in FIG. 2.

Since the terminal device 100 provided in this embodiment can perform the above-mentioned random access method, the technical effects that can be obtained can refer to the above-mentioned method embodiment, and will not be repeated here.

Optionally, an embodiment of the present application further provides a communication device (for example, the communication device may be a chip or a chip system), and the communication device includes a processor for implementing the method in any of the foregoing method embodiments. In a possible design, the communication device further includes a memory. The memory is used to store necessary program instructions and data, and the processor can call the program code stored in the memory to instruct the communication device to execute the method in any of the foregoing method embodiments. Of course, the memory may not be in the communication device. When the communication device is a chip system, it may be composed of a chip, or may include a chip and other discrete devices, which is not specifically limited in the embodiment of the present application.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, it may be implemented in the form of a computer program product in whole or in part. 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 described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer, or may include one or more data storage devices such as servers and data centers that can be integrated with the medium. The usable 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)). In the embodiment of the present application, the computer may include the aforementioned device.

Although the present application is described with reference to various embodiments, in the process of implementing the claimed application, those skilled in the art can understand and understand by viewing the drawings, the disclosure, and the appended claims. Implement other changes of the disclosed embodiment. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "one" does not exclude multiple. A single processor or other unit may implement several functions listed in the claims. Certain measures are described in mutually different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

Although the application has been described in combination with specific features and embodiments, it is obvious that various modifications and combinations can be made without departing from the spirit and scope of the application. Accordingly, this specification and drawings are merely exemplary descriptions of the application defined by the appended claims, and are deemed to have covered any and all modifications, changes, combinations or equivalents within the scope of the application. Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application also intends to include these modifications and variations.

Claims

A random access method, characterized in that the method includes:

The network device receives a plurality of first messages, each of the plurality of first messages includes a first preamble;

The network device determines K timing advance TA values, and K is a positive integer greater than 1;

The network device sends a second message, the second message including the K TA values, and a temporary cell radio network temporary identifier TC-RNTI and uplink grant corresponding to each of the K TA values ；

The network device receives a third message from the first terminal device on the resource indicated by the uplink grant corresponding to the first TA value, and the third message is scrambled with the TC-RNTI corresponding to the first TA value, so The third message includes the identifier of the first terminal device, where the first TA value is any TA value among the K TA values;

The network device sends a fourth message to the first terminal device, where the fourth message includes the access resource allocated by the network device, and the downlink data channel carrying the fourth message is scheduled by the downlink control information DCI, The DCI is scrambled by using the TC-RNTI corresponding to the first TA value.
The method according to claim 1, wherein the fourth message further includes a contention resolution identification CRID, and the CRID indicates a terminal device whose contention is successful.
The method according to claim 1 or 2, wherein the network device determining K TA values includes:

The network device inputs the signal carrying the plurality of first messages into the first neural network to obtain the number of terminal devices using the first preamble;

The network device inputs the number of the terminal devices and the signal carrying the plurality of first messages into the second neural network to obtain the K TA values.
A random access method, characterized in that the method includes:

The first terminal device sends a first message to the network device, where the first message includes the first preamble;

The first terminal device receives a second message from the network device, where the second message includes K TA values and a temporary cell wireless network temporary identifier corresponding to each of the K TA values TC-RNTI and uplink authorization, K is a positive integer greater than 1;

Determining, by the first terminal device, a first TA value from the K TA values;

The first terminal device sends a third message to the network device on the resource indicated by the uplink authorization corresponding to the first TA value, and the third message is scrambled by using the TC-RNTI corresponding to the first TA value , The third message includes the identifier of the first terminal device;

The first terminal device receives a fourth message from the network device according to the TC-RNTI corresponding to the first TA value, where the fourth message includes the access resource allocated by the network device.
The method according to claim 4, wherein the first terminal device determining the first TA value from the K TA values comprises:

The first terminal device determines the reference TA value according to the historical TA information of the first terminal device;

The first terminal device determines the TA value closest to the reference TA value among the K TA values as the first TA value.
The method according to claim 4, wherein the first terminal device determining the first TA value from the K TA values comprises:

The first terminal device randomly selects a TA value from the K TA values;

The first terminal device determines the randomly selected TA value as the first TA value.
The method according to any one of claims 4-6, wherein the fourth message further comprises: a contention resolution identification (CRID);

If the CRID corresponds to the identity of the first terminal device, the first terminal device sends an acknowledgement ACK to the network device on the access resource; or,

If the CRID does not correspond to the identity of the first terminal device, the first terminal device terminates random access or transfers to the next random access.
A random access method, characterized in that the method includes:

The network device receives a plurality of first messages, each of the plurality of first messages includes a first preamble;

Determining, by the network device, a first timing advance TA value according to the first preamble;

Sending a second message by the network device, the second message including the first TA value, a first temporary cell radio network temporary identifier TC-RNTI and a first uplink grant corresponding to the first TA value;

The network device successfully demodulates the K third messages scrambled by the first TC-RNTI on the resources indicated by the first uplink grant, and each of the K third messages is Including the identification of a terminal device, K is a positive integer greater than 1;

The network device sends a fourth message, where the fourth message includes K contention resolution identifiers CRIDs and access resources corresponding to each CRID of the K CRIDs, wherein each CRID corresponds to each CRID. The identifier of the terminal device in one of the K third messages, the downlink data channel carrying the fourth message is scheduled by the downlink control information DCI, and the DCI is scrambled by using the first TC-RNTI.
8. The method according to claim 8, wherein the fourth message further includes a TA value corresponding to each CRID, and the TA value is used for TA adjustment of the terminal device corresponding to each CRID.
The method according to claim 8 or 9, wherein the second message further includes indication information, and the indication information is used to indicate that there are multiple terminal devices on the resource indicated by the first uplink grant. The network device sends the third message.
The method according to claim 10, wherein the indication information is further used to indicate the number of terminal devices that send the third message to the network device on the resource indicated by the first uplink grant .
The method according to claim 10, wherein the indication information is specifically the value of the first TC-RNTI.
The method according to claim 8 or 9, wherein the position of the time-frequency resource for sending the second message is used to indicate that there are multiple terminal devices on the resource indicated by the first uplink grant to the The network device sends the third message.
The method according to any one of claims 8-13, wherein the network device successfully demodulates the K scrambled by the first TC-RNTI on the resource indicated by the first uplink grant The third message includes:

The network device determines non-orthogonal parameters, where the non-orthogonal parameters include one or more of the following: spreading sequence, interleaving pattern, or multi-dimensional constellation modulation codebook;

The network device successfully demodulates the K third messages according to the non-orthogonal parameter on the resource indicated by the first uplink grant.
A random access method, characterized in that the method includes:

The first terminal device sends a first message to the network device, where the first message includes the first preamble;

The first terminal device receives a second message from the network device, the second message including a first TA value, and a first temporary cell radio network temporary identifier TC-RNTI corresponding to the first TA value, and The first uplink authorization;

The first terminal device sends a third message to the network device on the resource indicated by the first uplink grant, the third message is scrambled by the first TC-RNTI, and the third message includes The identifier of the first terminal device;

The first terminal device receives a fourth message from the network device according to the first TC-RNTI, where the fourth message includes K contention resolution identifiers, CRIDs, and each of the K CRIDs. Corresponding access resources, wherein each CRID corresponds to an identifier of a terminal device included in one of the K third messages successfully demodulated by the network device, and K is a positive integer greater than 1.
The method according to claim 15, wherein the fourth message further includes a TA value corresponding to each CRID; the method further includes:

If the K CRIDs include the first CRID corresponding to the identity of the first terminal device, the first terminal device performs TA adjustment according to the TA value corresponding to the first CRID.
The method according to claim 15 or 16, wherein the second message further includes indication information, and the indication information is used to indicate that there are multiple terminal devices on the resource indicated by the first uplink grant. The network device sends a third message.
The method according to claim 17, wherein the indication information is further used to indicate the number of terminal devices that send the third message to the network device on the resource indicated by the first uplink grant .
The method according to claim 17, wherein the indication information is specifically the value of the first TC-RNTI.
The method according to claim 15 or 16, wherein the position of the time-frequency resource for sending the second message is used to indicate that there are multiple terminal devices on the resource indicated by the first uplink grant to the The network device sends the third message.
The method according to any one of claims 15-20, wherein the first terminal device sending a third message to the network device on the resource indicated by the first uplink authorization comprises:

The first terminal device sends a third message processed by a non-orthogonal processing method to the network device on the resource indicated by the first uplink grant, where the non-orthogonal processing method includes one or more of the following Item: use spread spectrum sequence spreading, use interleaving pattern interleaving, or use multi-dimensional constellation modulation codebook modulation.
A communication device, characterized in that the communication device includes: a transceiver module and a processing module;

The transceiver module is configured to receive a plurality of first messages, each of the plurality of first messages includes a first preamble;

The processing module is used to determine K timing advance TA values, where K is a positive integer greater than 1;

The transceiver module is further configured to send a second message, the second message including the K TA values and a temporary cell radio network temporary identifier TC- corresponding to each TA value of the K TA values RNTI and uplink authorization;

The transceiver module is further configured to receive a third message from the first terminal device on the resource indicated by the uplink grant corresponding to the first TA value, where the third message uses the TC-RNTI corresponding to the first TA value For scrambling, the third message includes an identifier of the first terminal device, wherein the first TA value is any TA value among the K TA values;

The transceiver module is further configured to send a fourth message to the first terminal device, where the fourth message includes the access resource allocated by the communication device, and the downlink data channel carrying the fourth message is controlled by downlink control information. For DCI scheduling, the DCI is scrambled by using the TC-RNTI corresponding to the first TA value.
The communication device according to claim 22, wherein the communication device is used to implement the method according to any one of claims 1 to 3.
A communication device, characterized in that the communication device includes: a transceiver module and a processing module;

The transceiver module is configured to send a first message to a network device, where the first message includes a first preamble;

The transceiver module is further configured to receive a second message from the network device, the second message including K TA values, and a temporary cell wireless network corresponding to each TA value of the K TA values Temporary identification TC-RNTI and uplink authorization, K is a positive integer greater than 1;

The processing module is configured to determine a first TA value from the K TA values;

The transceiver module is further configured to send a third message to the network device on the resource indicated by the uplink authorization corresponding to the first TA value, where the third message uses the TC-RNTI corresponding to the first TA value Scrambling, the third message includes the identification of the communication device;

The transceiver module is further configured to receive a fourth message from the network device according to the TC-RNTI corresponding to the first TA value, where the fourth message includes the access resource allocated by the network device.
The communication device according to claim 24, wherein the communication device is used to implement the method according to any one of claims 4 to 7.
A communication device, characterized in that the communication device includes: a transceiver module and a processing module;

The transceiver module is configured to receive a plurality of first messages, each of the plurality of first messages includes a first preamble;

The processing module is configured to determine a first timing advance TA value according to the first preamble;

The transceiver module is further configured to send a second message, the second message including the first TA value, the first temporary cell radio network temporary identification TC-RNTI and the first TA value corresponding to the first TA value. Uplink authorization;

The processing module is further configured to successfully demodulate the K third messages scrambled by the first TC-RNTI on the resources indicated by the first uplink grant, and each of the K third messages The third message includes an identifier of a terminal device, and K is a positive integer greater than 1.

The transceiver module is further configured to send a fourth message, the fourth message including K contention resolution identifiers CRIDs and access resources corresponding to each CRID of the K CRIDs, wherein each The CRID corresponds to the identification of the terminal device in one of the K third messages, and the downlink data channel carrying the fourth message is scheduled by the downlink control information DCI, and the DCI uses the first TC- RNTI scrambling.
The communication device according to claim 26, wherein the communication device is used to implement the method according to any one of claims 8 to 14.
A communication device, characterized in that the communication device includes: a transceiver module and a processing module;

The processing module is configured to generate a first message, the first message including a first preamble;

The transceiver module is configured to send the first message to a network device;

The transceiver module is further configured to receive a second message from the network device, the second message including a first TA value, and a first temporary cell wireless network temporary identifier TC- corresponding to the first TA value. RNTI and the first uplink authorization;

The processing module is further configured to generate a third message, the third message is scrambled by the first TC-RNTI, and the third message includes the identifier of the communication device;

The transceiver module is further configured to send the third message to the network device on the resource indicated by the first uplink authorization;

The transceiver module is further configured to receive a fourth message from the network device according to the first TC-RNTI, where the fourth message includes K contention resolution identifiers CRIDs, and each of the K CRIDs Access resources corresponding to one CRID, where each CRID corresponds to the identification of the terminal device included in one of the K third messages successfully demodulated by the network device, and K is a positive integer greater than 1. .
The communication device according to claim 28, wherein the terminal device is used to implement the method according to any one of claims 15 to 21.
A computer-readable storage medium, characterized by comprising instructions, which when running on a communication device, causes the communication device to execute the method according to any one of claims 1-3, or causes the The communication device executes the method according to any one of claims 8-14, or causes the communication device to execute the method according to any one of claims 4-7, or causes the communication device to execute The method of any one of claims 15-21.
A communication device, characterized in that the communication device includes: a processor;

The processor is configured to read the computer-executable instructions in the memory, and execute the computer-executable instructions, so that the communication device executes the method according to any one of claims 1-3; or, executes the method according to claim 8. -14; or execute the method according to any one of claims 4-7; or execute the method according to any one of claims 15-21.
A communication device, characterized in that the communication device includes: a processor and a memory;

The memory is used to store computer-executable instructions, and when the processor executes the computer-executed instructions, the communication device is caused to execute the method according to any one of claims 1 to 3; or, to execute the method according to claim 1 The method according to any one of 8-14; or, the method according to any one of claims 4-7; or, the method according to any one of claims 15-21.
A computer program product, characterized in that, when the computer program product runs on a communication device, the communication device is caused to execute the method according to any one of claims 1 to 3; or, to execute the method according to claim 1 The method according to any one of 8-14; or, the method according to any one of claims 4-7; or, the method according to any one of claims 15-21.
A communication system, characterized in that the communication system comprises the communication device according to claim 22 or 23 and the communication device according to claim 24 or 25; or, the communication system comprises the communication device according to claim 26 or The communication device according to 27 and the communication device according to claim 28 or 29.