Communication method and device

Abstract

A communication method and apparatus, the communication method comprising: receiving a first primary synchronization signal PSS corresponding to a first cell set, the first cell set comprising a first cell and a second cell; and determining to move from the second cell to the first cell, and sending an access request, the access request being used for accessing the first cell, the access request being associated with a first identifier, and the first identifier being used for identifying the terminal device in the first cell set. Through the method, when the terminal equipment moves in the first cell set, the terminal equipment only needs to receive the special PSS to carry out lightweight downlink synchronization, and then uplink synchronization is realized through the special identifier, so that the communication efficiency is improved, and the cells or sub-regions of the first cell set share the same special identifier resource, and the user experience is improved. The identification resource is prevented from being reconfigured when the terminal moves each time, and the waste of communication resources is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication technology, and in particular to a communication method and device. BACKGROUND

[0002] New Radio (NR) initial access includes downlink synchronization and uplink random access. In downlink synchronization, a base station transmits a synchronization signal block (SSB), a user equipment (UE) synchronizes timing according to a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) in the SSB, and receives a master information block (MIB) and a system information block (SIB) message to determine a cell identity and an uplink random access time-frequency resource and sequence set. In uplink random access, taking a 4-step random access as an example, the UE transmits a random access (RA) preamble, the base station transmits a random access response (RA Response) to feed back a timing advance (TA), the UE transmits a user identity after timing adjustment, and the base station feeds back a conflict resolution. If the UE moves from one cell to another cell, the above initial access process needs to be completed again and the TA needs to be reacquired, resulting in low communication efficiency. SUMMARY

[0003] The present application provides a communication method, which helps to improve communication efficiency and avoid waste of communication resources.

[0004] In a first aspect, an embodiment of the present application provides a communication method, which can be applied to a terminal device, such as a terminal or a communication module in the terminal, or a circuit or chip responsible for communication function in the terminal (such as a Modem chip, also known as a baseband chip, or a System on Chip (SoC) chip or a System in Packet (SIP) chip containing a modem core). Taking the case where the method is applied to a terminal device, the method includes:

[0005] receiving a first primary synchronization signal (PSS) corresponding to a first cell set, the first cell set including a first cell and a second cell;

[0006] determining to move from the second cell to the first cell, and sending an access request, the access request being used to access the first cell, the access request being associated with a first identifier, the first identifier being used to identify the terminal device in the first cell set.

[0007] By using the method, when the terminal device moves in the first cell set, the terminal device only needs to receive the dedicated PSS for light downlink synchronization, and then realizes uplink synchronization through the dedicated identifier, thereby improving communication efficiency. In addition, the cells or sub-areas of the first cell set share the same dedicated identifier resource, so that the terminal device does not need to reconfigure the identifier resource every time it moves, and communication resource waste is avoided.

[0008] In a possible design, the method further includes: receiving the first identifier, in response to determining that the terminal device moves from a third cell to a fourth cell, or in response to the terminal device accessing a cell for the first time being the fourth cell.

[0009] In a possible design, the access request includes the first identifier, and / or a first preamble; the first preamble is associated with the first identifier, or the first preamble is associated with the first identifier and a current time unit.

[0010] In a possible design, the method further includes:

[0011] determining the first preamble.

[0012] In a possible design, the method includes: the first preamble corresponds to the first identifier in a one-to-one manner.

[0013] The first preamble is associated with the first identifier and a current time unit, and satisfies the following formula:

[0014]

[0015] wherein, is an identifier of the first preamble, is the first identifier, is a time slot number corresponding to a current time, is a quantity of the first preambles associated with the first cell set.

[0016] By using the method, the preamble frequency-hops with time, so that the dedicated random access preambles of different dedicated transmission areas do not always conflict, and the dedicated random access preamble ID can be uniquely determined according to the dedicated UE ID, without the need for radio resource control (RRC) signaling to indicate the dedicated random access preamble ID.

[0017] In a possible design, the sequence of the first preamble satisfies the following formula:

[0018]

[0019]

[0020]

[0021] where s λ,k,l (n) is the sequence of the first preamble, Δ T is the maximum round trip delay corresponding to the first cell set, Δ F is the maximum Doppler shift corresponding to the first cell set, λ is a cubic term coefficient index indicating the first cell set, k is a quadratic term coefficient index indicating the terminal device, l is a linear term coefficient index indicating the terminal device, and N is a sequence length of the sequence.

[0022] By using the method, the same cubic term coefficient is used for the dedicated RA preamble sequence in the same first cell set, and different linear term and quadratic term coefficients are used to distinguish the terminal devices accessing the first cell set, thereby avoiding the conflict of the terminal devices in different first cell sets, achieving one-time configuration, long-term use, reducing the number of times of configuring the RA preamble for the terminal device by the network device, and saving communication resources.

[0023] In a possible design, the data format of the access request indicates a synchronization signal block (SSB) index corresponding to the first cell.

[0024] In a possible design, the method further includes: acquiring a time-frequency resource, where the time-frequency resource is used for the terminal device to access a cell in the first cell set.

[0025] The sending of the access request includes:

[0026] The access request is sent through the time-frequency resource.

[0027] By using the method, the terminal device can perform data transmission with the first cell set through the dedicated time-frequency resource, thereby avoiding occupying other time-frequency resources and improving communication efficiency.

[0028] In a second aspect, an embodiment of the present application further provides a communication method, which can be applied to a network device, for example, an access network device or a component (for example, a circuit, a chip or a chip system, etc.) in the access network device. For example, the method is applied to the access network device, and the method includes:

[0029] transmit a first primary synchronization signal (PSS) corresponding to a first cell set, the first cell set including a first cell and a second cell;

[0030] receive an access request, the access request being used for accessing the first cell, the access request being associated with a first identifier, the first identifier being used for identifying the terminal device in the first cell set.

[0031] With the above method, when the terminal device moves in the first cell set, the terminal device only needs to receive a dedicated PSS for light downlink synchronization, and then realizes uplink synchronization through a dedicated identifier, thereby improving communication efficiency, and cells or sub-areas of the first cell set share the same dedicated identifier resource, thereby avoiding the need for the terminal to reconfigure identifier resources every time it moves, and avoiding waste of communication resources.

[0032] In a third aspect, an embodiment of the present application also provides a communication method, which can be applied to a terminal device, for example, a terminal or a communication module in the terminal, or a circuit or chip responsible for communication functions in the terminal (such as a Modem chip, also known as a baseband chip, or a SoC chip or SIP chip containing a modem core), and the method is taken as an example applied to a terminal device, the method includes: receiving a synchronization signal block (SSB) corresponding to a fourth cell; determining that the terminal device moves from a third cell to the fourth cell, or, in response to the terminal device first accessing a cell being the fourth cell, receiving a first identifier, wherein the third cell is a cell outside a first cell set, the fourth cell is a cell in the first cell set, and the first identifier is used for identifying the terminal device in the first cell set.

[0033] In a possible design, the method further includes: receiving a first primary synchronization signal (PSS) corresponding to the first cell set, the first cell set including a first cell and a second cell; determining that the terminal device moves from the second cell to the first cell, and transmitting an access request, the access request being used for accessing the first cell, the access request being associated with the first identifier.

[0034] In a possible design, the access request includes the first identifier, and / or a first preamble; the first preamble is associated with the first identifier, or the first preamble is associated with the first identifier and a current time unit.

[0035] In a possible design, the method further includes: determining the first preamble.

[0036] In a possible design, the first preamble is associated with the first identifier, including: the first preamble corresponds to the first identifier one by one;

[0037] The first preamble is associated with the first identifier and a current time unit, and satisfies the following formula:

[0038]

[0039] wherein, is an identifier of the first preamble, is the first identifier, is a slot number corresponding to the current time, is the first preamble quantity associated with the first cell set.

[0040] In a possible design, a sequence of the first preamble satisfies the following formula:

[0041]

[0042]

[0043]

[0044] wherein s λ,k,l is a sequence of the first preamble, Δ T is a maximum round trip delay corresponding to the first cell set, Δ F is a maximum Doppler shift corresponding to the first cell set, λ is a cubic term coefficient index indicating the first cell set, k is a quadratic term coefficient index indicating the terminal device, l is a linear term coefficient index indicating the terminal device, and N is a sequence length of the sequence.

[0045] In a possible design, a data format of the access request indicates a synchronization signal block (SSB) index corresponding to the first cell.

[0046] In a possible design, the method further includes: acquiring a time-frequency resource, the time-frequency resource being used for the terminal device to access a cell in the first cell set; and the sending the access request includes: sending the access request through the time-frequency resource.

[0047] In a fourth aspect, an embodiment of the present application further provides a communication method, which can be applied to a network device, for example, an access network device or a component (for example, a circuit, a chip or a chip system, etc.) in the access network device. For example, the method is applied to the access network device, and the method includes: sending a synchronization signal block (SSB) corresponding to a fourth cell; and sending a first identifier, wherein the first identifier is used to identify the terminal device in the first cell set, and the fourth cell is a cell in the first cell set.

[0048] In a fifth aspect, at least one embodiment of the present application provides a communication apparatus, which is arranged in a terminal device. In a possible design of the communication apparatus, the communication apparatus can include a module or unit or means corresponding to each of the methods / operations / steps / actions described in the first aspect. The module or unit or means can be hardware circuit, software, or a combination of hardware circuit and software. The operations performed by the communication apparatus and the advantages can refer to the methods and advantages described in the first aspect.

[0049] In a possible design of the communication apparatus, the communication apparatus includes a processing unit and a transceiver. The transceiver is configured to receive a first primary synchronization signal (PSS) corresponding to a first cell set, where the first cell set includes a first cell and a second cell. The transceiver is further configured to determine to move from the second cell to the first cell, and to send an access request for accessing the first cell, where the access request is associated with a first identifier, and the first identifier is used to identify the terminal device in the first cell set.

[0050] The processing unit is configured to perform all operations of the terminal device described in the first aspect except for the receiving and sending operations.

[0051] In a possible design of the communication apparatus, the transceiver is further configured to receive the first identifier, where the third cell is a cell outside the first cell set, and the fourth cell is a cell inside the first cell set.

[0052] In a possible design of the communication apparatus, the access request includes the first identifier, and / or a first preamble. The first preamble is associated with the first identifier, or the first preamble is associated with the first identifier and a current time unit.

[0053] In a possible design of the communication apparatus, the processing unit is further configured to determine the first preamble.

[0054] In a possible design of the communication apparatus, the first preamble corresponds to the first identifier in a one-to-one manner.

[0055] The first preamble is associated with the first identifier and a current time unit, and satisfies the following formula:

[0056]

[0057] wherein, is an identifier of the first preamble, is the first identifier, is a time slot number corresponding to a current time, is a number of the first preambles associated with the first cell set.

[0058] In a possible design, the sequence of the first preamble satisfies the following formula:

[0059]

[0060]

[0061]

[0062] where s λ,k,l (n) is the sequence of the first preamble, Δ T is a maximum round trip delay corresponding to the first cell set, Δ F is a maximum Doppler shift corresponding to the first cell set, λ is a cubic term coefficient index indicating the first cell set, k is a quadratic term coefficient index indicating the terminal device, l is a linear term coefficient index indicating the terminal device, and N is a sequence length of the sequence.

[0063] In a possible design, the data format of the access request indicates a synchronization signal block (SSB) index corresponding to the first cell.

[0064] In a possible design, the transceiver is further configured to: acquire the time-frequency resource, where the time-frequency resource is used for the terminal device to access a cell in the first cell set; and send the access request through the time-frequency resource.

[0065] In a possible design, the communication apparatus can include a module or unit or means corresponding to each of the methods / operations / steps / actions described in the second aspect. The module or unit or means can be a hardware circuit, or software, or a combination of hardware circuit and software. The operations performed by the communication apparatus and the advantages can refer to the methods and advantages described in the second aspect.

[0066] In a possible design, the communication apparatus includes: a processing unit and a transceiver. The transceiver is configured to: send a first primary synchronization signal (PSS) corresponding to a first cell set, where the first cell set includes a first cell and a second cell; and receive an access request, where the access request is used for accessing the first cell, and the access request is associated with a first identifier, where the first identifier is used for identifying a terminal device in the first cell set.

[0067] The processing unit is configured to perform all operations of the terminal device described in the second aspect except for the processing and receiving operations.

[0068] In a seventh aspect, at least one embodiment of the present application provides a communication apparatus, which is arranged in a terminal device, and in a possible design, the communication apparatus can include a module or unit or means corresponding to each of the methods / operations / steps / actions described in the third aspect, which can be hardware circuit, software, or a combination of hardware circuit and software.

[0069] In a possible design, the communication apparatus includes a processing unit and a transceiver unit, and the transceiver unit is configured to receive a synchronization signal block (SSB) corresponding to a fourth cell; determine that the terminal device moves from a third cell to the fourth cell, or, in response to that the terminal device accesses a cell for the first time as the fourth cell, receive a first identifier, where the third cell is a cell outside a first cell set, the fourth cell is a cell inside the first cell set, and the first identifier is used to identify the terminal device in the first cell set.

[0070] The processing unit is configured to perform all operations of the terminal device described in the third aspect except for the receiving and transmitting operations.

[0071] In a possible design, the transceiver unit is further configured to receive a first primary synchronization signal (PSS) corresponding to the first cell set, where the first cell set includes a first cell and a second cell; determine that the terminal device moves from the second cell to the first cell; and transmit an access request, where the access request is used to access the first cell, and the access request is associated with the first identifier.

[0072] In a possible design, the access request includes the first identifier, and / or a first preamble; the first preamble is associated with the first identifier, or the first preamble is associated with the first identifier and a current time unit.

[0073] In a possible design, the processing unit is further configured to determine the first preamble.

[0074] In a possible design, the first preamble corresponds to the first identifier in a one-to-one manner.

[0075] The first preamble is associated with the first identifier and a current time unit, and the following formula is satisfied:

[0076]

[0077] wherein, is an identifier of the first preamble, is the first identifier, is a slot number corresponding to the current time, is a quantity of the first preambles associated with the first cell set.

[0078] In a possible design, the sequence of the first preamble satisfies the following formula:

[0079]

[0080]

[0081]

[0082] where s λ,k,l (n) is the sequence of the first preamble, Δ T is the maximum round trip delay corresponding to the first cell set, Δ F is the maximum Doppler shift corresponding to the first cell set, λ is a cubic term coefficient index indicating the first cell set, k is a quadratic term coefficient index indicating the terminal device, l is a linear term coefficient index indicating the terminal device, and N is a sequence length of the sequence.

[0083] In a possible design, the data format of the access request indicates a synchronization signal block (SSB) index corresponding to the first cell.

[0084] In a possible design, the transceiver is further configured to: acquire the time-frequency resource, where the time-frequency resource is used for the terminal device to access a cell in the first cell set; and send the access request through the time-frequency resource.

[0085] In an eighth aspect, at least one embodiment of the present application further provides a communication apparatus arranged in a terminal device. In a possible design, the communication apparatus can include a module or unit or means corresponding to each of the methods / operations / steps / actions described in the fourth aspect, which can be a hardware circuit, software, or a combination of hardware circuit and software.

[0086] In a possible design, the communication apparatus includes: a processing unit and a transceiver, where the transceiver is configured to send a synchronization signal block (SSB) corresponding to a fourth cell; and the transceiver is further configured to send a first identifier, where the first identifier is used to identify the terminal device in the first cell set, and the fourth cell is a cell in the first cell set.

[0087] The processing unit is configured to perform all operations of the terminal device described in the fourth aspect except for the processing and transceiving operations performed by the terminal device.

[0088] In a ninth aspect, the present application provides a communication apparatus, which comprises a memory and one or more processors. The memory is configured to store part or all of the necessary computer programs or instructions for implementing the functions related to the first aspect, the second aspect, the third aspect or the fourth aspect. The one or more processors are configured to execute the computer programs or instructions, and when the computer programs or instructions are executed, the communication apparatus is caused to implement the method in any possible design or implementation manner of the first aspect.

[0089] In a possible design, the communication apparatus further comprises interface circuitry, and the processor is configured to communicate with other apparatuses or components through the interface circuitry.

[0090] In a possible design, the communication apparatus further comprises the memory.

[0091] The communication apparatus can be a terminal, or a communication module in the terminal, or a chip responsible for communication functions in the terminal, such as a Modem chip (also referred to as a baseband chip), or a System on Chip (SoC) or a System in Package (SIP) chip containing a Modem module.

[0092] In a tenth aspect, the present application provides a communication system, which comprises the apparatus in the fifth aspect and the apparatus in the sixth aspect, or the apparatus in the seventh aspect and the apparatus in the eighth aspect.

[0093] In an eleventh aspect, the present application provides a computer-readable storage medium, which stores instructions or programs, and when the instructions or programs run on a communication apparatus, the instructions cause the communication apparatus to execute the method in the first aspect, the second aspect, the third aspect, the fourth aspect, any possible implementation manner of the first aspect, any possible implementation manner of the second aspect, any possible implementation manner of the third aspect or any possible implementation manner of the fourth aspect.

[0094] In a twelfth aspect, the present application provides a computer program product, which comprises computer programs or instructions, and when the computer programs or instructions run on a computer, the instructions execute the method in the first aspect, the second aspect, the third aspect, the fourth aspect, any possible implementation manner of the first aspect, any possible implementation manner of the second aspect, any possible implementation manner of the third aspect or any possible implementation manner of the fourth aspect. BRIEF DESCRIPTION OF DRAWINGS

[0095] Figure 1 FIG. 1 is a schematic diagram of an architecture of a communication system to which embodiments of the present application are applied;

[0096] Figure 2 is a contention-based random access procedure provided by the present application;

[0097] Figure 3 is a communication method provided by an embodiment of the present application;

[0098] Figure 4 is a communication method interaction provided by an embodiment of the present application;

[0099] Figure 5 is another communication method interaction provided by an embodiment of the present application;

[0100] Figure 6 is a communication system structure provided by an embodiment of the present application;

[0101] Figure 7 is a communication device structure provided by an embodiment of the present application; and

[0102] Figure 8 is a communication device structure provided by an embodiment of the present application. DETAILED DESCRIPTION

[0103] The embodiments of the present application provide a communication method, device, storage medium and computer program product, which are used to improve communication efficiency. The technical solutions in the embodiments of the present application will be described below with reference to the drawings.

[0104] The technical solutions of the present application can be applied to a terrestrial network (TN), a non-terrestrial network (NTN), or a scenario in which the NTN and the TN are fused. The NTN system may, for example, be a satellite communication system, a high altitude platform station (HAPS) communication system, a global navigation satellite system (GNSS), etc. The TN system may, for example, be a 4th generation (4G) communication system (e.g., a long term evolution (LTE) system), a worldwide interoperability for microwave access (WiMAX) communication system, a 5th generation (5G) communication system (e.g., a new radio (NR) system), and a future communication network system, etc.

[0105] In order to better understand the embodiments of the present application, the network architecture of the embodiments of the present application will be described first. Please refer to Figure 1 , Figure 1 is a schematic diagram of the architecture of a communication system to which embodiments of the present application are applied. It is noted that Figure 1 is a possible, non-limiting, schematic diagram of a system. As shown in Figure 1 , the communication system 10 includes a radio access network (RAN) 100 and a core network (CN) 200. Optionally, the communication system 10 can also include the Internet 300. The RAN 100 includes at least one RAN node (e.g., 110a and 110b in Figure 1 , collectively denoted by 110) and at least one terminal (e.g., 120a-120j in Figure 1 , collectively denoted by 120). The RAN 100 can also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in Figure 1 ), etc. The terminals 120 are wirelessly connected to the RAN nodes 110. The RAN nodes 110 are connected to the core network 200 by wireline or wirelessly. The core network network elements in the core network 200 and the RAN nodes 110 in the RAN 100 can be different physical devices, respectively, can be the same physical device integrated with the logical functions of the core network and the logical functions of the radio access network, or can be a physical device integrated with the functions of part of the core network network elements and part of the RAN nodes 110. The terminals and the terminals and the RAN nodes 110 and the RAN nodes 110 can be connected to each other by wire or wirelessly. Figure 1 This is only a schematic diagram. The communication system can also include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in Figure 1 .

[0106] The RAN 100 can be a 3rd generation partnership project (3GPP) related cellular system, e.g., a 4G, 5G mobile communication system, or a future-oriented evolution system. The RAN 100 can also be an open radio access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (WiFi) system. The RAN 100 can also be a communication system in which two or more of the above systems are integrated.

[0107] RAN node 110, sometimes also referred to as radio access network equipment, access network device, RAN entity, or access node, constitutes part of the communication system and is used to help terminals achieve wireless access. Multiple RAN nodes 110 in communication system 10 can be of the same type or different types. In some scenarios, the roles of RAN node 110 and terminal 120 are relative, for example... Figure 1 Network element 120i can be a helicopter or a drone, and it can be configured as a mobile base station. For terminals 120j that access RAN 100 through network element 120i, network element 120i is a base station; however, for base station 110a, network element 120i is a terminal. RAN node 110 and terminal 120 are sometimes referred to as communication devices, for example... Figure 1 Network elements 110a and 110b can be understood as communication devices with base station functions, while network elements 120a-120j can be understood as communication devices with terminal functions.

[0108] In one possible scenario, RAN node 110 can be a base station (BS), an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a next-generation NodeB (gNB), a base station in a future mobile communication system, or an access node in a WiFi system, etc. Figure 1 110a), micro base stations or indoor stations (such as Figure 1 The RAN node 110 can be a relay node or donor node, or a radio controller in a CRAN scenario. Optionally, the RAN node 110 can also be a server, wearable device, vehicle, or in-vehicle equipment. For example, the radio access network device in vehicle-to-everything (V2X) technology can be a roadside unit (RSU). All or part of the functions of the RAN node 110 in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (e.g., a cloud platform). The RAN node 110 in this application can also be a logical node, logical module, or software capable of implementing all or part of the functions of the RAN node 110.

[0109] In another possible scenario, a terminal is assisted by multiple RAN nodes 110 to implement wireless access in cooperation, and different RAN nodes 110 respectively implement part of functions of a base station. For example, a RAN node 110 can be a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), etc. The CU and the DU can be separately arranged, or can also be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or a radio frequency unit, such as a radio remote unit (RRU), an active antenna processing unit (AAU), or a remote radio head (RRH).

[0110] In different systems, the CU (or CU-CP and CU-UP), DU or RU can also have different names, but those skilled in the art can understand their meanings. For example, in an ORAN system, the CU can also be referred to as an O-CU (open CU), the DU can also be referred to as an O-DU, the CU-CP can also be referred to as an O-CU-CP, the CU-UP can also be referred to as an O-CU-UP, and the RU can also be referred to as an O-RU. For the convenience of description, the CU, CU-CP, CU-UP, DU and RU are taken as examples for description in this application. Any one of the CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0111] A terminal can also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. The terminal can be widely applied to various scenarios, such as device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, machine-type communication (MTC), internet of things (IOT), virtual reality, augmented reality, industrial control, automatic driving, remote medical treatment, smart power grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal can be a mobile phone, tablet computer, computer with wireless transceiver function, wearable device, vehicle, unmanned aerial vehicle, helicopter, airplane, ship, robot, mechanical arm, smart home device, etc. Embodiments of this application do not limit the device form of the terminal.

[0112] For the convenience of description, the following describes the base station as an example of the RAN node 110. The base station and the terminal can be fixed in position or mobile. The base station and the terminal can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water; can also be deployed on an airplane, a balloon, and a man-made satellite. Embodiments of the present application do not limit the application scenarios of the base station and the terminal.

[0113] The roles of the base station and the terminal can be relative, for example, Figure 1 The helicopter or the unmanned aerial vehicle 120i in the above can be configured to move the base station, and for those terminals 120j that access the wireless access network 100 through 120i, the terminal 120i is the base station; but for the base station 110a, 120i is the terminal, that is, 110a and 120i communicate through a wireless air interface protocol. Of course, 110a and 120i can also communicate through an interface protocol between base stations and base stations, and at this time, 120i is also a base station relative to 110a. Therefore, the base station and the terminal can be collectively referred to as a communication device, Figure 1 110a and 110b in the above can be referred to as a communication device with a base station function, Figure 2 120a-120j in the above can be referred to as a communication device with a terminal function.

[0114] The base station and the terminal, the base station and the base station, and the terminal and the terminal can communicate through a licensed frequency spectrum, can communicate through an unlicensed frequency spectrum, and can simultaneously communicate through a licensed frequency spectrum and an unlicensed frequency spectrum; can communicate through a frequency spectrum below 6 gigahertz (GHz), can communicate through a frequency spectrum above 6 GHz, and can simultaneously use a frequency spectrum below 6 GHz and a frequency spectrum above 6 GHz. Embodiments of the present application do not limit the frequency spectrum resources used for wireless communication.

[0115] In embodiments of the present application, the functions of the base station can also be performed by a module (such as a chip) in the base station, or by a control subsystem containing a base station function. The control subsystem containing a base station function herein can be a control center in the above-mentioned application scenarios such as smart grid, industrial control, intelligent transportation, and smart city. The functions of the terminal can also be performed by a module (such as a chip or a modem) in the terminal, or by a device containing a terminal function.

[0116] In order to facilitate the understanding of the related content of the embodiments of the present application, the following explains and describes some terms and processes involved in the embodiments of the present application. This part is only for the convenience of understanding and cannot be regarded as a disclosure or specific limitation of the technical solutions of the present application.

[0117] 1. cell

[0118] A cell is a contiguous coverage area that transmits a carrier in a specific frequency range. The cell corresponds to the center frequency point of the carrier, i.e., the center frequency point of the cell. The cell is usually hexagonal, and different frequencies need to be used between adjacent cells to avoid interference between cells. For cells that are far apart, the same frequency can be used to complete different data transmissions.

[0119] Taking 5G as an example, in actual cell configuration, the center frequency point number of the cell is first determined, and then the SSB frequency domain position is determined, wherein the frequency interval between the SSB frequency domain position and the first resource block (RB) of the cell is an integer multiple of the subcarrier interval.

[0120] 2. initial access

[0121] The UE needs to search for a network that serves itself and then access the network to achieve initial access, which involves a cell search and selection process and a random access process. These two processes are the basis for UE interaction with the base station, and through these two processes, the UE completes network access and realizes wireless communication.

[0122] Cell search is the process of UE and cell achieving downlink synchronization (including time and frequency synchronization) and detecting cell identifier (ID). After cell search is completed, the UE selects a cell with the best signal to camp on. When the UE is powered on, the first signal received is the SSB, which includes the PSS and SSS from the cell. The UE synchronizes the timing according to the PSS and SSS in the SSB, thereby achieving downlink synchronization with the cell.

[0123] After the UE selects a cell to camp on, it will initiate a random access process in the current cell. The main purpose of random access design is to enable the UE and the cell to achieve uplink synchronization, and at the same time, the UE to obtain the uplink transmission time advance TA (Timing Advance). When establishing an initial wireless link (i.e., the UE transitions from the idle state to the connected state), the UE can obtain a user identifier, i.e., the cell radio network temporary identifier C-RNTI (Cell Radio Network Temporary Identifier), through the random access process.

[0124] 3. random access (RA)

[0125] In the RA process, the UE needs to initiate access on a specific physical random access channel (PRACH) time-frequency resource corresponding to the current cell, and the signal transmitted by the UE when initiating access is the RA preamble. The RA preamble is used to inform the base station of a random access request, so that the base station can estimate the transmission delay between it and the UE.

[0126] There are two different mechanisms for RA: contention-based and non-contention-based.

[0127] Mechanism 1: contention-based RA

[0128] In this RA process, the preamble is randomly selected by the UE within the broadcast range, and these preambles are random. In this case, the preambles selected by different UEs may conflict, and the base station needs to resolve the access of different UEs through competition, and the result is random. It should be noted that at the initial access, the UE uses contention-based RA.

[0129] Mechanism 2: non-contention-based RA

[0130] In this RA process, the preamble is assigned to the UE by the base station, and these preambles are dedicated. In this case, the UE will not have preamble conflicts, but when there are not enough dedicated preambles, the base station will instruct the UE to initiate contention-based RA.

[0131] 4. Contention-based RA

[0132] Figure 2 A contention-based random access flowchart is shown in this application. As shown in Figure 3 , the flowchart includes steps S201-S204:

[0133] Step S201: The UE sends the RA preamble, i.e., message (Msg) 1, so that the network device knows the UE random access request, and estimates the uplink time difference according to the reception of the RA preamble. Since each SSB corresponds to a different preamble index (Preamble Index), the UE will first select an SSB before selecting an RA preamble, and then determine the RA preamble according to the SSB. The network device may be, for example, a base station.

[0134] Step S202: The network device sends the RA response, i.e., Msg2. After receiving the RA preamble from the UE, the network device obtains the uplink timing offset TA of the UE according to the RA preamble. The network device sends the RA response through Msg2, indicating that it has received the preamble, and carries the value of TA to the UE through Msg2 for adjusting the transmission timing of the UE

[0135] Step S203: UE acquires uplink synchronization and can transmit a message (i.e., Msg3). The Msg3 carries a unique identifier (UE ID) of the UE, which is used for collision resolution to distinguish UEs that send a collision.

[0136] If the UE has previously connected to a certain cell, the C-RNTI of the cell is used as the ID, which is a unique UE ID in a specific cell; otherwise, the UE uses an identifier from the core network.

[0137] Step S204: The network device sends a contention resolution (Contention Resolution) message, i.e., Msg4, to the UE.

[0138] After the UE sends Msg3, a contention resolution timer is started. The network device assists the UE in contention resolution by using the C-RNTI or using the UE Contention Resolution Identity.

[0139] 5. Non-contention-based RA

[0140] The biggest difference compared with the contention-based RA procedure is that the non-contention-based RA access preamble is allocated by the base station, which reduces the contention resolution process; other processes are the same as the contention-based RA procedure. In this case, the UE does not have a preamble collision, but when the dedicated preamble is insufficient, the base station instructs the UE to initiate contention-based RA.

[0141] The current dedicated preamble uses a cyclic shift of a time-domain mapped ZC (Zadoff-Chu) root sequence. For a time-domain Zadoff-Chu sequence with a cyclic shift index v, the discrete-time signal satisfies the following formula:

[0142]

[0143] where the root sequence number u ∈ {1, 2,..., N-1}, v represents the cyclic shift index, and Δ T represents the maximum round-trip delay.

[0144] In the process of terminal communication, the terminal can move from one cell to another, or the terminal moves from one area to another, which causes the terminal to need to switch the beam used by the access network, or the terminal needs to switch the beam used by the access network due to the influence of communication quality. Cell movement or beam switching can cause the terminal to need to complete initial access again and repeat the contention-based RA procedure described above. In the scenario of frequent switching, the existing RA procedure has high energy consumption and large delay, resulting in poor user experience.

[0145] To solve the above problems and improve communication efficiency, at least one embodiment of the present application provides a communication method.

[0146] The method provided by the present application will be described below with reference to the accompanying drawings. It can be understood that, in the present application, the terminal device and / or the network device can perform some or all of the steps in the present application, and these steps are only examples, and the present application can also perform other steps or variations of various steps. In addition, the various steps can be performed in different orders as presented in the present application, and it is possible that not all steps in the present application are performed.

[0147] It can be understood that, in the method provided by the present application described below, the terminal device and the network device are taken as an example to illustrate the execution subject of the interaction, but the present application does not limit the execution subject of the interaction. For example, the terminal device in the method provided by the embodiment of the present application can also be a chip, a chip system, or a processor supporting the terminal device to implement the method, and can also be a logical node, a logical module or software capable of implementing all or part of the functions of the terminal device; the network device in the method provided by the present application described below can also be a chip, a chip system, or a processor supporting the network device to implement the method, and can also be a logical node, a logical module or software capable of implementing all or part of the functions of the network device.

[0148] Figure 3 A flowchart of a communication method provided by at least one embodiment of the present application is shown as follows, Figure 4 As shown in the figure, the process of the UE accessing the network is divided into meta access and dedicated access. It should be noted that the meta access is an access process initiated when the terminal accesses a dedicated transmission area for the first time or moves from one dedicated transmission area to another dedicated transmission area, and the dedicated access is a process initiated when the terminal device moves within a dedicated transmission area. The movement of the terminal device within the dedicated transmission area after completing the meta access triggers the dedicated access, for example, the dedicated access 1 represents the dedicated access initiated when the terminal device moves from the cell 1 to the cell 2, the dedicated access n represents the dedicated access initiated when the terminal device moves from the cell n to the cell n+1, n is an integer greater than 0, and the cells 1-n+1 are in the dedicated transmission area.

[0149] For example, the dedicated transmission area can be a set of a plurality of cells as described above, and the cells in the set can be the same or adjacent in geographical position. In this case, the dedicated access is a process initiated when switching between the cells in the set.

[0150] Exemplarily, the dedicated transmission area can be a set of multiple sub-areas, which can be fixed relative to the earth, or can be understood as referring to geographical areas fixed relative to the earth. Exemplarily, the sub-area can have at least one of the following properties: shape, contour, size, radius, area, geographical position, etc. In addition, the "sub-area" can also have a height property, i.e., the sub-area can be understood as a geographical area at a given height or a range of heights. Exemplarily, the shape of the sub-area can be defined by a protocol or can be defined by a network device. The sub-area shapes defined by different network devices can be the same or different. The same network device can also define multiple sub-area shapes. Similarly, the size, radius, and area of the sub-area can be defined by a protocol or can be defined by a network device. The sub-area sizes, radii, and areas defined by different network devices can be the same or different. The same network device can also define multiple sub-area sizes, multiple sub-area radii, or multiple sub-area areas. For example, for a geostationary orbit (GEO) satellite, the projection of a beam of the GEO satellite on the ground can be taken as a sub-area. Since the GEO satellite is stationary relative to the earth, the projection of the beam of the GEO satellite on the ground can be considered to be fixed relative to the earth. In this case, the dedicated transmission area is the procedure initiated when moving between the sub-areas in the set.

[0151] Figure 5 and Figure 4 A communication method interaction schematic diagram provided by at least one embodiment of the present application is shown in the following Figure 5 and Figure 4 The meta access and the dedicated access in the present application will be described in detail.

[0152] As Figure 5 shown, the meta access procedure in the present application includes steps S400-S405, which are specifically as follows:

[0153] Step S400: The network device sends a synchronization signal block SSB1 corresponding to cell 1 to the terminal device. Correspondingly, the terminal device receives the SSB1 from the network device. The SSB1 includes PSS1 and SSS1 from the cell 1. The UE synchronizes the timing according to the PSS1 and the SSS1, thereby realizing downlink synchronization with the cell.

[0154] In the embodiments of the present application, the cell 1 is an element in a first cell set, which can be the dedicated transmission area as described above, i.e., the cell 1 can be the cell as described above or the sub-area as described above.

[0155] It should be noted that the first cell set is only an example of a name, and can also be referred to as a first area set, a first beam set, etc., which is not limited in the present application.

[0156] Before step S400, the terminal device is in a non-network entry state, that is, the terminal device accesses the cell 1 for the first time; or, the cell 0 accessed by the terminal device is a cell outside the first cell set, and when it is determined that the terminal moves from the cell 0 to the cell 1, step S400 is performed.

[0157] Step S401: the terminal device sends a RA preamble 1 (Preamble1) to the network device, and correspondingly, the network device receives the Preamble1 from the terminal device.

[0158] Step S402: the network device sends a RA response to the terminal device, and the RA response includes a TA1 corresponding to the communication between the terminal and the cell 1, and correspondingly, the terminal device receives the RA response from the network device.

[0159] Step S403: the terminal device sends an ID1 corresponding to the terminal device to the network device, and correspondingly, the network device receives the ID1 from the terminal device.

[0160] Step S404: the network device sends a contention resolution message to the terminal device, and correspondingly, the terminal device receives the contention resolution message from the network device.

[0161] The detailed description of the related parameters, information or processes in steps S401-S404 can refer to steps S201-S204 as described above, and the present application will not be repeated here.

[0162] Step S405: the network device sends an ID2 (shown as a dedicated terminal identifier in the figure) to the terminal device, and the ID2 is used to identify the terminal device in the first cell set, and correspondingly, the terminal device receives the ID2 from the network device.

[0163] It should be noted that the ID1 is a terminal identifier code carried by the terminal device, which is a self-owned identifier of the terminal device or an identifier determined by the terminal device, and the ID2 is a dedicated identifier allocated by the network device for the terminal device, and the dedicated identifier is unique in the first cell set, and the dedicated identifiers of different terminal devices in the same first cell set are different.

[0164] In the present application, the terminal determines to move from one cell to another cell, which can be determined by the beam received by the terminal. Taking the terminal moving from cell 0 to cell 1 as an example, the beam corresponding to cell 0 is beam 0, and the beam corresponding to cell 1 is beam 1. When the terminal receives the power of beam 1 or detects that the power of beam 1 is greater than a first threshold value, the terminal moves to cell 1. When the terminal receives the power of beam 0 or detects that the power of beam 0 is less than a second threshold value, the terminal moves out of cell 0. The first threshold value and the second threshold value can be protocol predefined or set by other means. Alternatively, the terminal can determine to move from cell 0 to cell 1 by geographical location information, for example, the terminal moves from the geographical location range corresponding to cell 0 to the geographical location range corresponding to cell 1, or from the geographical location range corresponding to cell 0 to the intersection of the geographical location ranges of cell 0 and cell 1. Alternatively, the terminal determines to move from cell 0 to cell 1 by signaling. It should be noted that the above-mentioned ways of determining to move from one cell to another cell are only examples and should not be regarded as limiting the present application.

[0165] In a possible implementation, the network device can also configure a dedicated PRACH time-frequency resource for the terminal device, i.e., the terminal acquires a dedicated PRACH time-frequency resource, which corresponds to the first cell set, i.e., the terminal implements data transmission with cell 1 through the dedicated PRACH time-frequency resource, and the dedicated PRACH time-frequency resource is also used for the terminal device to access a cell or a sub-area in the first cell set.

[0166] In a possible implementation, the network device can also configure a dedicated RA preamble (or referred to as Preamble2) for the terminal device, or the terminal device determines a dedicated RA preamble according to ID2, and the ID of the dedicated RA preamble is unique in the dedicated transmission area.

[0167] For example, the network device sends the ID of the dedicated RA preamble to the terminal device through RRC signaling, and does not hop with time, and the dedicated RA preamble of each terminal device corresponds to ID2 one by one, i.e., the dedicated RA preamble is associated with ID2.

[0168] For another example, the terminal device or the network device determines the ID of the dedicated RA preamble according to ID2, which satisfies the following formula:

[0169]

[0170] wherein, is the identifier of the dedicated RA preamble, is ID2, is the slot number corresponding to the current time, is the number of dedicated RA preambles associated with the first cell set.

[0171] In the initial stage of meta access, the terminal acquires an initial slot number according to SSB1, and determines the slot number corresponding to the current time according to the initial slot number For example, the terminal acquires the initial slot number of SSB1 as 1, and the slot number corresponding to the current time after 10 slots is 11. At this time, the ID of the dedicated RA preamble hops with time, that is, the dedicated RA preamble is associated with ID2 and the current time unit, which can avoid the conflict of dedicated RA in different dedicated transmission areas, and can be uniquely determined according to ID2, without the need for RRC signaling to indicate the dedicated RA preamble ID, thereby reducing the data transmission cost.

[0172] As described above, the current dedicated preamble adopts the cyclic shift of the ZC root sequence in the time domain. Since the capacity of the Zadoff-Chu sequence is proportional to the square of the sequence length, in a mobile scenario, the cyclic shift of the restricted set is used to resist the Doppler shift, which supports no more than ±2 subcarrier frequency offset. The capacity of the cyclic shift of the restricted set is limited, and when the number of terminals accessing the first cell set is too large, using the cyclic shift of the ZC root sequence to generate the dedicated RA preamble will cause the number of dedicated RA preambles supported by the first cell set to be unable to meet the number of terminals accessing.

[0173] At least one embodiment of the present application provides a method for generating a dedicated RA preamble to solve the problem that the number of dedicated RA preambles supported by the first cell set cannot meet the number of terminals accessing. The method specifically satisfies the following formula:

[0174]

[0175]

[0176]

[0177] Wherein, s λ,k,l (n) is a dedicated RA preamble sequence, Δ T is the maximum round trip delay corresponding to the first cell set, Δ F is the maximum Doppler shift corresponding to the first cell set, λ is a third-order term coefficient index indicating the first cell set, k is a second-order term coefficient index indicating the terminal device, and l is a first-order term coefficient index indicating the terminal device, that is, λ is used to distinguish different first cell sets, k and l are used to distinguish different terminal devices in the same first cell set, and N is the sequence length of the dedicated RA preamble, and N can be a prime number, for example, N∈{839, 139, 1151, 571}, represents the upward rounding.

[0178] When the network device generates the dedicated RA preamble, the cubic coefficient index λ of the W sequence is determined based on the dedicated transmission area ID, and the quadratic coefficient index k and linear coefficient index l of the sequence are determined based on the dedicated RA preamble ID of the dedicated UE. The cubic coefficient index λ∈{1,2,…,N-1}, and the quadratic coefficient index l… Index of coefficients of the first term Maximum support within the first small cluster A dedicated RA preamble. For example, if N = 839, Δ T =10,Δ F =1, then 65,536 dedicated random access preambles can be supported within the dedicated transmission area.

[0179] The following is combined with Figure 5 The process of dedicated access in this application is described in detail.

[0180] like Figure 6 As shown, the dedicated access process in this application includes steps S501 to S503, as detailed below:

[0181] Step S501: The terminal device receives the first primary synchronization signal PSS2 corresponding to the first cell set from the network device. Correspondingly, the network device sends PSS2 to the terminal device.

[0182] In one possible implementation, after the terminal device accesses a cell or sub-area in the first cell set, it moves within the first cell set, for example, from cell 2 to cell 3 (i.e., the first cell set includes cell 2 and cell 3). Cell 2 and cell 3 can be cells or sub-areas as described above. At this time, the terminal device initiates a dedicated access procedure. The SSB2 corresponding to PSS2 can be a dedicated synchronization signal block of the first cell set. After receiving PSS2, the terminal device completes the synchronization timing to achieve downlink synchronization.

[0183] Step S502: The terminal device sends an access request to the network device, and the network device receives the access request from the terminal device.

[0184] For example, the access request may include the terminal device's ID2 and / or Premble2, meaning the access request is associated with ID2, and the access request is used to request access to cell 3. For instance, the terminal device sends ID2 to the network device, and the network device can determine the terminal device's Premble2 based on ID2; or, for another example, the terminal device's ID2 may be the same as its Premble2.

[0185] For example, the terminal device can send an access request through the dedicated PRACH time-frequency resources described above.

[0186] Exemplarily, the data format of the access request indicates the SSB index corresponding to the cell 3, or other reference signal index, for example, CSI-RS. Taking the SSB index as an example, the SSB index corresponding to the cell 3 indicates the state of the subcarrier spacing. Exemplarily, the access request can include four data formats, including Format 0, Format 1, Format 2 and Format 3, wherein Format 0 is applicable to the case of SSB normal coverage, subcarrier spacing 1.25 kHz, Format 1 is applicable to the case of larger SSB coverage radius, subcarrier spacing 1.25 kHz, Format 2 is applicable to the case of larger SSB path loss, subcarrier spacing 1.25 kHz, and Format 3 is applicable to the case of smaller SSB coverage radius and higher timing resolution, subcarrier spacing 5 kHz.

[0187] Step S503: The network device sends an RA response to the terminal device, the RA response including TA2 corresponding to the terminal communicating with the cell 3, and correspondingly, the terminal device receives the RA response from the network device, and completes the uplink synchronization.

[0188] Through the above method, when the terminal device moves in the first cell set, it only needs to receive the dedicated PSS for light downlink synchronization, and then obtain TA through the dedicated RA preamble to realize uplink synchronization, thereby improving the communication efficiency and avoiding conflicts when multiple terminals access. Moreover, the cells or sub-areas of the first cell set share the same dedicated RA preamble resource, thereby avoiding the need to configure the RA preamble every time the terminal moves, avoiding waste of communication resources, and improving the communication efficiency.

[0189] It should be noted that the above multiple embodiments can be combined, and the combined scheme is implemented. Optionally, some operations in the flow of each method embodiment are combined, and / or the order of some operations is changed. Moreover, the execution order between the steps of each flow is only exemplary, and does not constitute a limitation on the execution order between the steps, and other execution orders between the steps can also be used. It is not intended to indicate that the execution order is the only execution order in which these operations can be performed. Those skilled in the art can think of various ways to reorder the operations herein. In addition, it should be pointed out that the process details related to one embodiment herein are also applicable in a similar manner to other embodiments, or different embodiments can be combined for use.

[0190] Figure 6 A communication system structure diagram provided by at least one embodiment of the present application is shown in FIG. 6, which includes a terminal device 61 and a network device 62, wherein the terminal device 61 is configured to perform the terminal device function in any of the communication methods described above. Figure 7 The network device 62 is configured to perform the network device function in any of the communication methods described above.

[0191] The network device 62 is configured to perform the network device function in any of the preceding communication methods.

[0192] Figure 7 Another communication device is provided in the structure diagram of the present application. The communication device can be used to realize any possible function in the above method embodiments, and thus can also realize the beneficial effects possessed by the above method embodiments.

[0193] As shown in Figure 4 The communication device 700 includes a processing unit 710.

[0194] In a possible implementation, the communication device 700 can further include a transceiver unit 720.

[0195] In a possible implementation, the communication device 700 can further include a storage unit 730.

[0196] In a possible implementation, the communication device 700 can further include the transceiver unit 720 and the storage unit 730.

[0197] The communication device 700 is used to realize the function of the terminal device in the above method embodiments.

[0198] In a possible implementation, the transceiver unit 720 is configured to receive a first primary synchronization signal (PSS) corresponding to a first cell set, the first cell set including a first cell and a second cell, and to determine that the terminal device moves from the second cell to the first cell, and to send an access request, the access request being used to access the first cell, the access request being associated with a first identifier, the first identifier being used to identify the terminal device in the first cell set. The processing unit 710 is configured to perform all operations except the processing and receiving operations performed by the terminal device in the above embodiments. The storage unit 730 is configured to store any data, computer instructions and / or computer programs that can be involved in the embodiments of the present application. For more detailed description of the processing unit 710 and the transceiver unit 720, reference can be made to the related description in the method embodiments described in Figure 5 and Figure 4

[0199] In a possible design, the transceiver unit 720 is further configured to receive a synchronization signal block (SSB) corresponding to a fourth cell;

[0200] In a possible design, the transceiver unit 720 is further configured to receive the first identifier, wherein the third cell is a cell outside the first cell set, and the fourth cell is a cell inside the first cell set.

[0201] ​In a possible design, the access request comprises the first identifier, and / or, a first preamble; the first preamble is associated with the first identifier, or the first preamble is associated with the first identifier and a current time unit.

[0202] In a possible design, the processing unit 710 is further configured to determine the first preamble.

[0203] In a possible design, the first preamble is in one-to-one correspondence with the first identifier.

[0204] The first preamble is associated with the first identifier and a current time unit, and the following formula is satisfied:

[0205]

[0206] wherein, is an identifier of the first preamble, is the first identifier, is a time slot number corresponding to a current time, is the number of first preambles associated with the first cell set.

[0207] In a possible design, a sequence of the first preamble satisfies the following formula:

[0208]

[0209]

[0210]

[0211] wherein, s λ,k,l is a sequence of the first preamble, Δ T is a maximum round trip delay corresponding to the first cell set, Δ F is a maximum Doppler shift corresponding to the first cell set, λ is a coefficient index of a cubic term indicating the first cell set, k is a coefficient index of a quadratic term indicating the terminal device, l is a coefficient index of a linear term indicating the terminal device, and N is a sequence length of the sequence.

[0212] In a possible design, a data format of the access request indicates a synchronization signal block (SSB) index corresponding to the first cell.

[0213] In a possible design, the transceiver 720 is further configured to: acquire the time-frequency resource, where the time-frequency resource is used for the terminal device to access a cell in the first cell set; and send the access request through the time-frequency resource.

[0214] The communication device 700 is used to implement the functions of the network device in the above method embodiments.

[0215] In one possible implementation, the transceiver unit is used to transmit a first primary synchronization signal (PSS) corresponding to a first cell set, the first cell set including a first cell and a second cell; the transceiver unit is also used to receive an access request for accessing the first cell, the access request being associated with a first identifier, the first identifier being used to identify the terminal device in the first cell set. The terminal device processing unit 710 is used to perform all operations other than the processing and transceiver operations performed by the network device in the embodiments described above. The storage unit 730 is used to store any data, computer instructions, and / or computer programs that may be involved in the embodiments of this application. A more detailed description of the above processing unit 710 and transceiver unit 720 can be found in [reference]. Figure 5 and Figure 8 The relevant descriptions in the method embodiments shown.

[0216] In one possible design, the transceiver unit is also used to: transmit a synchronization signal block (SSB) corresponding to the fourth cell;

[0217] Optionally, the transceiver unit 720 may be a transceiver, which may include an antenna and radio frequency circuitry, etc.

[0218] The processing unit 710 may be a processor (or processing circuitry), such as a baseband processor, which may include one or more CPUs.

[0219] Figure 8 This is a schematic diagram of a communication device provided in this application. This communication device can be used to implement any possible function in the above method embodiments, and therefore can also achieve the beneficial effects of the above method embodiments.

[0220] like Figure 7 As shown, the communication device 800 includes at least one processor 810. In one possible implementation, the communication device 800 may further include interface circuitry 820.

[0221] In one possible implementation, the communication device 800 may also include a memory 830.

[0222] In one possible implementation, the communication device 800 may also include a memory 830 and an interface circuit 820.

[0223] In some embodiments, the processor 810 and the memory 830 are coupled to each other; and / or, the processor 810 and the interface circuit 820 are coupled to each other. It can be understood that the interface circuit 820 can be a transceiver or an input / output interface. The memory 830 can be used to store computer instructions executed by the processor 810 or store input data required by the processor 810 to run the computer instructions or store data generated by the processor 810 after running the computer instructions.

[0224] Figure 8 and Figure 7 The communication device shown in the figure is only an example, and in actual applications, the communication device can have more or fewer components than those shown in the figure, two or more components can be combined, or can have a different component configuration, and in the Figure 8 and Figure 7 The communication device shown in the figure is only an example, and in actual applications, the communication device can have more or fewer components than those shown in the figure, two or more components can be combined, or can have a different component configuration, and in the Figure 8 and ​ In the above embodiments, the processing unit can also be referred to as a processing module, a processor; the transceiving unit can also be referred to as a transceiving module, a transceiver; and the storage unit can also be referred to as a storage module, a memory.

[0225] It can be understood that the processor in the embodiments of the present application can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor can be a microprocessor or any conventional processor.

[0226] The method steps in the embodiments of the present application can be implemented in hardware, or can be implemented in software instructions executable by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, a register, a hard disk, a mobile hard disk, a CD-ROM or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a network device or a terminal. The processor and the storage medium can also exist as discrete components in the network device or the terminal.

[0227] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer programs or instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are performed. The computer can be a general purpose computer, a special purpose computer, a computer network, a network device, a user equipment or other programmable apparatus. The computer programs or instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer programs or instructions can be transferred from one website site, computer, server or data center to another website site, computer, server or data center through wired or wireless manner. The computer readable storage medium can be any available medium accessible by a computer or a data storage device such as a server, data center and the like integrated with one or more available media. The available media can be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; an optical medium, such as a digital video disc; and a semiconductor medium, such as a solid state disk. The computer readable storage medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile storage media.

[0228] In various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be mutually referred to if there is no special description and logical conflict. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0229] It can be understood that various numerical numbers involved in the embodiments of the present application are only used for differentiation for convenience of description, and are not used to limit the scope of the embodiments of the present application. The size of the serial number of the above processes does not mean the execution order, and the execution order of the processes should be determined according to its function and inherent logic.

[0230] In the present application, "at least one" means one or more, and "multiple" means two or more. The association relationship between the associated objects is described by "and / or", which means that there can be three kinds of relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. In the character description of the present application, the character " / " generally represents that the associated objects before and after it are in an "or" relationship; in the formula of the present application, the character " / " represents that the associated objects before and after it are in a "division" relationship. "Including at least one of A, B and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

Claims

1. A communication method applied to a terminal device, characterized in that, The method includes: Receive the first primary synchronization signal (PSS) corresponding to the first cell set, the first cell set including the first cell and the second cell; The device determines that it is moving from the second cell to the first cell and sends an access request to access the first cell. The access request is associated with a first identifier, which is used to identify the terminal device in the first cell set.

2. The method according to claim 1, characterized in that, The method further includes determining that the terminal device has moved from the third cell to the fourth cell, or, in response to the terminal device first accessing the fourth cell, that the terminal device has moved from the third cell to the fourth cell. The first identifier is received, wherein the third cell is a cell outside the first cell set, and the fourth cell is a cell within the first cell set.

3. The method according to claim 2, characterized in that, The access request includes the first identifier and / or a first preamble; the first preamble is associated with the first identifier, or the first preamble is associated with the first identifier and the current time unit.

4. The method according to claim 3, characterized in that, The method further includes: Determine the first preamble.

5. The method according to claim 3, characterized in that, The first preamble is associated with the first identifier, including: the first preamble and the first identifier correspond one-to-one; The first preamble, associated with the first identifier and the current time unit, satisfies the following formula: in, This is the identifier for the first preamble. For the first identifier, The timeslot number corresponding to the current time. The number of the first preambles associated with the first cell set.

6. The method according to claim 5, characterized in that, The sequence of the first preamble satisfies the following formula: Among them, s λ,k,l (n) is the sequence of the first preamble, Δ T Δ is the maximum round-trip delay corresponding to the first cell set. F The maximum Doppler frequency shift corresponding to the first cell set is λ, where λ is the index of the cubic term coefficient of the first cell set, k is the index of the quadratic term coefficient of the terminal device, l is the index of the linear term coefficient of the terminal device, and N is the sequence length of the sequence.

7. The method according to claim 1, characterized in that, The data format of the access request indicates the SSB index corresponding to the first cell.

8. The method according to any one of claims 1-7, characterized in that, The method further includes: acquiring time-frequency resources, wherein the time-frequency resources are used by the terminal device to access cells in the first cell set; The sending of the access request includes: The access request is sent using the time-frequency resources.

9. A communication method applied to a network device, characterized in that, The method includes: Send a first primary synchronization signal (PSS) corresponding to a first set of cells, the first set of cells including a first cell and a second cell; A request is received to access the first cell. The access request is associated with a first identifier, which is used to identify the terminal device in the first cell set.

10. A communication method applied to a terminal device, characterized in that, The method includes: Receive the synchronization signal block SSB corresponding to the fourth cell; The device determines that it has moved from the third cell to the fourth cell, or, in response to the terminal device first accessing the fourth cell, it receives a first identifier, wherein the third cell is a cell outside the first cell set, the fourth cell is a cell within the first cell set, and the first identifier is used to identify the terminal device in the first cell set.

11. The method according to claim 10, characterized in that, The method further includes: Receive the first primary synchronization signal (PSS) corresponding to the first cell set, wherein the first cell set includes a first cell and a second cell; The system determines that it is moving from the second cell to the first cell and sends an access request for accessing the first cell. The access request is associated with the first identifier.

12. The method according to claim 11, characterized in that, The access request includes the first identifier and / or a first preamble; the first preamble is associated with the first identifier, or the first preamble is associated with the first identifier and the current time unit.

13. The method according to claim 12, characterized in that, The method further includes: Determine the first preamble.

14. The method according to claim 12, characterized in that, The first preamble is associated with the first identifier, including: the first preamble and the first identifier correspond one-to-one; The first preamble, associated with the first identifier and the current time unit, satisfies the following formula: in, This is the identifier for the first preamble. For the first identifier, The timeslot number corresponding to the current time. The number of the first preambles associated with the first cell set.

15. The method according to claim 5, characterized in that, The sequence of the first preamble satisfies the following formula: Among them, s λ,k,l (n) is the sequence of the first preamble, Δ T Δ is the maximum round-trip delay corresponding to the first cell set. F The maximum Doppler frequency shift corresponding to the first cell set is λ, where λ is the index of the cubic term coefficient of the first cell set, k is the index of the quadratic term coefficient of the terminal device, l is the index of the linear term coefficient of the terminal device, and N is the sequence length of the sequence.

16. The method according to claim 10, characterized in that, The data format of the access request indicates the SSB index corresponding to the first cell.

17. The method according to any one of claims 10-16, characterized in that, The method further includes: acquiring time-frequency resources, wherein the time-frequency resources are used by the terminal device to access cells in the first cell set; The sending of the access request includes: The access request is sent using the time-frequency resources.

18. A communication method applied to a network device, characterized in that, The method includes: Send the synchronization signal block SSB corresponding to the fourth cell; Send a first identifier, wherein the first identifier is used to identify the terminal device in the first cell set, and the fourth cell is a cell within the first cell set.

19. A communication device, characterized in that, include: The apparatus is used to perform the method as described in any one of claims 1 to 9, or to perform the method as described in claim 10, or to perform the method as described in any one of claims 11 to 17, or to perform the method as described in claim 18.

20. A communication device, characterized in that, include: At least one processor is configured to invoke computer instructions in memory to cause the communication device to perform the method as claimed in any one of claims 1 to 9, or the method as claimed in claim 10, or the method as claimed in any one of claims 11 to 17, or the method as claimed in claim 18.

21. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions or programs that, when executed on a communication device, implement the method as described in any one of claims 1 to 9, or the method as described in claim 10, or the method as described in any one of claims 11 to 17, or the method as described in claim 18.

22. A computer program product, characterized in that, The computer program product includes a computer program or instructions that, when executed on a computer, cause the computer to perform the method as claimed in any one of claims 1 to 9, or the method as claimed in claim 10, or the method as claimed in any one of claims 11 to 17, or the method as claimed in claim 18.

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