Communication method and apparatus

Abstract

The present application relates to the technical field of communications. Provided are a communication method and apparatus, which are used for solving the problem of nonlinear distortion during preamble sending, and improving the coverage capability and communication efficiency of a random access signal. The method comprises: receiving a first message from a network device, the first message indicating a preamble and configuration information of a first signal; and sending a second message to the network device on the basis of the configuration information, the second message comprising the preamble and the first signal, wherein the first signal is generated on the basis of the preamble or a root sequence, and the average transmitting power of the first signal is less than or equal to the average transmitting power of the preamble.

Description

A communication method and apparatus

[0001] The present application claims priority to the Chinese Patent Application No. 202410537348.8, filed on April 29, 2024, and entitled "A communication method and apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of communication technology, and in particular to a communication method and apparatus. BACKGROUND

[0003] In a wireless communication system, a terminal can implement uplink synchronization or establish a connection with a network device through a random access process. In the random access process, the terminal can send a random access signal, i.e., a random access preamble, to the network device through a specific random access resource according to resource configuration from the network device to implement uplink synchronization.

[0004] At present, the uplink synchronization sequence can adopt a Zaddof-Chu (ZC) sequence, but the peak to average power ratio (PAPR) of part of the root sequence time domain signal of the ZC sequence is relatively high. The power amplifier (PA) will produce nonlinear distortion in the high power area of the signal, which causes the receiving end to be unable to correctly demodulate the signal. To avoid the nonlinear distortion problem of the high power signal, the sending time domain signal can perform power backoff according to the maximum value of the signal power, so that the signal sending power decreases, resulting in limited coverage of the random access. SUMMARY

[0005] The present application provides a communication method and apparatus for solving the problem that the peak to average power ratio of the sent preamble is relatively high, resulting in limited transmission power and limited coverage of the random access, and improving the coverage capability and communication efficiency of the random access signal.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] In a first aspect, a communication method is provided. The method can be applied to a communication apparatus, which can be a terminal or a component (such as a processor, a chip, a chip system, or a circuit or a functional module) in a terminal. The method comprises: receiving a first message from a network device, the first message indicating configuration information of a preamble and a first signal; and sending a second message to the network device according to the configuration information, the second message comprising the preamble and the first signal, wherein the first signal is generated according to the preamble or a root sequence, and the average transmission power of the first signal is less than or equal to the average transmission power of the preamble.

[0008] In the above embodiments, the preamble and the first signal are transmitted simultaneously, wherein the first signal does not carry useful information, and is used to reduce the peak-to-average power ratio (PAPR) of the overall signal, so that the transmission power of the preamble can be higher, and the coverage and communication efficiency of random access can be improved.

[0009] In an embodiment, the configuration information is further used to indicate at least one of the following information: a subcarrier length corresponding to the first signal, a ratio of the subcarrier length corresponding to the first signal to a subcarrier length corresponding to the preamble, an index number of the subcarrier length corresponding to the first signal, a first frequency domain resource corresponding to the first signal, a maximum value of an average transmission power corresponding to the first signal, a maximum value of a difference or a ratio of the average transmission power of the preamble and the first signal, a maximum value of an average transmission power corresponding to a part of symbol sequences of the first signal transmitted through a second frequency domain resource, or a maximum value of a difference or a ratio of the average transmission power of the preamble and the part of symbol sequences of the first signal transmitted through the second frequency domain resource. The first frequency domain resource is a resource configured by the network for the terminal to transmit the preamble, and the second frequency domain resource is a frequency domain resource other than the configured resource.

[0010] In the above embodiments, the network device can configure the terminal to transmit the subcarrier length corresponding to the first signal, or configure the terminal to transmit the average transmission power corresponding to the first signal, or configure the relative information of the transmission power of the first signal and the preamble, etc., by sending the configuration information to the terminal, so that the terminal can generate the first signal corresponding to the preamble according to the configuration information, and transmit the first signal simultaneously with the preamble, thereby reducing the PAPR.

[0011] In an embodiment, the maximum value of the average transmission power corresponding to the first signal includes a first threshold and a second threshold, the average transmission power of a first subcarrier in the first signal is less than or equal to the first threshold, and the average transmission power of a second subcarrier in the first signal is less than or equal to the second threshold. The first frequency domain resource includes the first subcarrier and the second subcarrier. That is, the network can assign different average transmission powers to different subcarriers carrying the preamble.

[0012] In an embodiment, the subcarrier length corresponding to the first signal is associated with at least one of the following information: a subcarrier length of the preamble, a generation format of the preamble, a root sequence corresponding to the preamble, a subcarrier spacing of a physical random access channel, a frequency band of the physical random access channel, or a frequency domain resource mapping manner corresponding to the first signal and the preamble.

[0013] In the above embodiments, the network can configure different lengths of the reserved symbol for different preamble generation formats, different preamble lengths, different root sequences, or different frequency domain resources, so that the implementation of the reserved symbol is flexible and can meet different requirements.

[0014] In an embodiment, the time domain resources corresponding to the sending of the preamble and the sending of the first signal are the same, and the frequency domain resources corresponding to the sending of the preamble and the sending of the first signal are different. That is, the terminal can send the preamble and the reserved symbol at the same time, and map the preamble and the reserved symbol to different frequency domain resources, so as to reduce the PAPR of the overall signal and improve the signal coverage capability of the random access.

[0015] In an embodiment, the configuration information indicates one or more root sequences; and before the sending of the second message, the method further includes: generating a symbol sequence of the preamble according to the one or more root sequences and the cyclic shift length.

[0016] In an embodiment, before the sending of the second message, the method further includes: generating one or more symbol sequences included in the first signal according to the symbol sequence of the preamble.

[0017] In the above embodiments, the network device can indicate the terminal to generate a root sequence, the terminal generates a symbol sequence of the preamble according to the root sequence, and generates the reserved symbol such as the first signal according to the symbol sequence of the preamble through a certain algorithm.

[0018] In an embodiment, the configuration information includes at least one first symbol sequence, and the first symbol sequence is generated by the network device according to one or more root sequences; and before the sending of the second message, the method includes: generating one or more symbol sequences corresponding to the first signal according to the at least one first symbol sequence.

[0019] In the above embodiments, the network device can generate the first symbol sequence, so that the terminal can obtain the reserved symbol such as the first signal through a simple algorithm according to the first symbol sequence, thereby reducing the processing complexity of the terminal and saving the power consumption of the terminal.

[0020] In an embodiment, the configuration information includes an index of one or more root sequences; and / or, the configuration information includes an average transmission power of one or more symbol sequences corresponding to the first signal.

[0021] In an embodiment, the configuration information further includes first indication information for indicating a frequency domain resource mapping manner of the first signal corresponding to the preamble.

[0022] In the above embodiments, the present application provides multiple possible frequency domain resource mapping manners of the reserved symbol and the preamble, the network device can indicate the frequency domain resource mapping manner of the reserved symbol and the preamble to the terminal, and the flexible configuration of the reserved symbol can be realized to match different requirements.

[0023] In an embodiment, the first indication information is used to indicate at least one of the following information: the symbol sequence of the first signal is located on the left side of the preamble, the symbol sequence of the first signal is located on the right side of the preamble, part of the symbol sequence of the first signal is located on the left side of the preamble and part of the symbol sequence of the first signal is located on the right side of the preamble, or the symbol sequence of the first signal is arranged in a comb shape with the symbol sequence of the preamble.

[0024] In the above embodiments, the network device can indicate the frequency domain resource mapping manner of the reserved symbol and the preamble to the terminal by sending the first indication information, such as the reserved symbol being placed on the left side, the right side, both sides or in a comb shape of the frequency points of the preamble, so that the terminal can perform frequency domain resource mapping on the generated reserved symbol according to the first indication information, thereby reducing the PAPR of the overall transmitted signal and improving the coverage capability of random access.

[0025] In an embodiment, the first indication information includes at least one of the following information: the subcarrier length of the second symbol sequence, the subcarrier length of the first interval on both sides of the second symbol sequence, and the number of resource blocks occupied by the second symbol sequence and the first interval; wherein the second symbol sequence is the symbol sequence on the left side of the preamble; or the subcarrier length of the third symbol sequence, the subcarrier length of the second interval on both sides of the third symbol sequence, and the number of resource blocks occupied by the third symbol sequence and the second interval; wherein the third symbol sequence is the symbol sequence on the right side of the preamble; or the subcarrier length of the third interval, and the number of resource blocks occupied by the first signal and the preamble, wherein the third interval is the guard interval of the comb-shaped arrangement of the symbol sequences of the first signal and the preamble.

[0026] In the above embodiments, for different frequency domain resource mapping manners of the reserved symbol and the preamble, the network device can also configure related parameters for the terminal, such as the length of the guard interval corresponding to the reserved symbol, the number of resource blocks occupied by the reserved symbol and the guard interval, etc. Specifically, the protocol can be pre-configured with multiple sets of configuration parameters, and the network device can indicate the serial number or index number of the corresponding configuration parameters to the terminal, so as to indicate multiple related parameters in the corresponding set of configuration parameters, thereby reducing the signaling overhead and improving the configuration efficiency.

[0027] In an embodiment, the method further comprises: if the number of retransmissions of the preamble is greater than or equal to a first threshold, sending the preamble and a second signal to the network device; wherein the second signal is generated according to the preamble or a root sequence, an average transmission power of the second signal is less than or equal to an average transmission power of the preamble; the average transmission power of the second signal is greater than or equal to an average transmission power of the first signal, and / or a subcarrier length corresponding to the second signal is greater than or equal to a subcarrier length corresponding to the first signal.

[0028] In the above embodiment, if the number of retransmissions of the preamble reaches a preset threshold, the terminal can increase the average transmission power of the retransmitted reserved symbol, or increase the transmission efficiency of the preamble by increasing the subcarrier length of the reserved symbol.

[0029] In an embodiment, the method further comprises: receiving first configuration information from the network device, the first configuration information indicating a maximum value of an average transmission power corresponding to the second signal, frequency domain resources of the second signal, and / or a maximum value of a subcarrier length corresponding to the second signal; and determining the second signal according to the first configuration information.

[0030] In the above embodiment, the network device can send the first configuration information to the terminal, thereby indicating the terminal to retransmit the reserved symbol using a larger average transmission power, or indicating the terminal a larger subcarrier length of the reserved symbol, so that the terminal can regenerate the reserved symbol, such as the second signal, and send the preamble and the second signal to the network device, thereby improving the transmission efficiency of the preamble and enhancing the random access coverage.

[0031] In a second aspect, a communication method is provided, which can be applied to a communication device, which can be a network device or a component (such as a processor, a chip, a chip system, or a circuit or a functional module, etc.) in the network device. The method comprises: sending a first message to a terminal, the first message indicating configuration information of a preamble and a first signal; and receiving a second message from the terminal, the second message comprising the preamble and the first signal, wherein the first signal is generated according to the preamble or a root sequence, and an average transmission power of the first signal is less than or equal to an average transmission power of the preamble.

[0032] In an embodiment, the configuration information comprises at least one of the following: a subcarrier length corresponding to the first signal, a ratio of the subcarrier length corresponding to the first signal to the subcarrier length corresponding to the preamble, an index number of the subcarrier length corresponding to the first signal, indication information of a first frequency domain resource corresponding to the first signal, a maximum value of an average transmission power corresponding to the first signal, a maximum value of a difference or a ratio of the average transmission power of the preamble to the first signal, a maximum value of an average transmission power corresponding to a partial symbol sequence of the first signal transmitted through the second frequency domain resource, or a maximum value of a difference or a ratio of the average transmission power of the preamble to the partial symbol sequence of the first signal transmitted through the second frequency domain resource.

[0033] In an embodiment, the maximum value of the average transmission power corresponding to the first signal comprises a first threshold value and a second threshold value, an average transmission power of a first subcarrier in the first signal is less than or equal to the first threshold value, and an average transmission power of a second subcarrier in the first signal is less than or equal to the second threshold value.

[0034] In an embodiment, the subcarrier length corresponding to the first signal is associated with at least one of the following: a subcarrier length of the preamble, a generation format of the preamble, a root sequence corresponding to the preamble, a subcarrier spacing of a physical random access channel, a frequency band of the physical random access channel, or a frequency domain resource mapping manner corresponding to the first signal and the preamble.

[0035] In an embodiment, the configuration information indicates one or more root sequences used to generate the symbol sequence of the preamble and / or the first signal.

[0036] In an embodiment, the configuration information comprises at least one first symbol sequence generated by the network device according to one or more root sequences; and the at least one first symbol sequence is used to generate the symbol sequence of the first signal.

[0037] In an embodiment, the configuration information comprises an index of one or more root sequences; and / or, the configuration information comprises an average transmission power of one or more symbol sequences corresponding to the first signal.

[0038] In an embodiment, the configuration information further comprises first indication information used to indicate a frequency domain resource mapping manner corresponding to the first signal and the preamble.

[0039] In an embodiment, the first indication information is used to indicate at least one of the following: the symbol sequence of the first signal is located on the left side of the preamble, the symbol sequence of the first signal is located on the right side of the preamble, part of the symbol sequence of the first signal is located on the left side of the preamble and part of the symbol sequence of the first signal is located on the right side of the preamble, or the symbol sequence of the first signal is arranged in a comb shape with the symbol sequence of the preamble.

[0040] In an embodiment, the first indication information comprises at least one of the following: a subcarrier length of a second symbol sequence, a subcarrier length of a first interval on both sides of the second symbol sequence, a number of resource blocks occupied by the second symbol sequence and the first interval; wherein the second symbol sequence is a symbol sequence on the left side of the preamble; or a subcarrier length of a third symbol sequence, a subcarrier length of a second interval on both sides of the third symbol sequence, a number of resource blocks occupied by the third symbol sequence and the second interval; wherein the third symbol sequence is a symbol sequence on the right side of the preamble; or a subcarrier length of a third interval, a number of resource blocks occupied by the first signal and the preamble, wherein the third interval is a guard interval of the symbol sequence of the first signal and the preamble arranged in a comb shape.

[0041] In an embodiment, the method further comprises: sending first configuration information to the terminal, the first configuration information indicating a maximum value of an average transmission power corresponding to the second signal, frequency domain resources of the second signal, and / or a maximum value of a subcarrier length corresponding to the second signal; wherein the second signal is generated according to the preamble or root sequence, the average transmission power of the second signal is less than or equal to the average transmission power of the preamble; the average transmission power of the second signal is greater than or equal to the average transmission power of the first signal, and / or the subcarrier length corresponding to the second signal is greater than or equal to the subcarrier length corresponding to the first signal.

[0042] In a third aspect, a communication apparatus is provided for implementing the method in the above aspect. The communication apparatus can be the terminal in the first aspect, or the network device in the second aspect, or a node or device containing the terminal or the network device, or a module, such as a chip, chip system or circuit, in the terminal or the network device, or a logic node, logic module or software capable of implementing some or all of the functions.

[0043] The communication apparatus comprises modules, units or means for implementing the corresponding functions of the above method, which can be implemented by hardware, software or by hardware executing corresponding software. The hardware or software comprises one or more modules or units corresponding to the above functions.

[0044] In a possible implementation of the third aspect above, the communication apparatus can include a processing module and a transceiver module. The processing module can be configured to implement the processing functions in any of the above aspects and any possible implementation thereof. The processing module can be, for example, a processor. The transceiver module, which can also be referred to as a transceiver unit, can be configured to implement the functions of transmitting and / or receiving in any of the above aspects and any possible implementation thereof. The transceiver module can be constituted by a transceiver circuit, a transceiver, a transceiver, or a communication interface.

[0045] In a possible implementation of the third aspect above, the transceiver module includes a transmitting module and a receiving module, which are configured to implement the functions of transmitting and receiving in any of the above aspects and any possible implementation thereof, respectively.

[0046] In a fourth aspect, a communication apparatus is provided, which includes a processor. The processor is configured to couple with a memory and read instructions in the memory, and execute the method in any of the above aspects according to the instructions. The communication apparatus can be the terminal in the first aspect above or the network device in the second aspect above, or a node or device containing the terminal or the network device, or a module such as a chip, a chip system, or a circuit in the terminal or the network device, or a logic node, a logic module, or software capable of implementing part or all of the functions.

[0047] In a possible implementation of the fourth aspect above, the communication apparatus further includes a memory configured to store necessary program instructions and data.

[0048] In a possible implementation of the fourth aspect above, the communication apparatus is a chip or a chip system. Optionally, when the communication apparatus is a chip system, it can be constituted by a chip or include a chip and other discrete devices.

[0049] In a fifth aspect, a communication apparatus is provided, which includes a processor and an interface circuit. The interface circuit is configured to receive a computer program or instructions and transmit them to the processor. The processor is configured to execute the computer program or instructions to cause the communication apparatus to execute the method in any of the above aspects. The communication apparatus can be the terminal in the first aspect above or the network device in the second aspect above, or a node or device containing the terminal or the network device, or a module such as a chip, a chip system, or a circuit in the terminal or the network device, or a logic node, a logic module, or software capable of implementing part or all of the functions.

[0050] In a possible implementation of the fifth aspect above, the communication apparatus is a chip or a chip system. Optionally, when the communication apparatus is a chip system, it can be constituted by a chip or include a chip and other discrete devices.

[0051] In a sixth aspect, a computer-readable storage medium is provided, which stores instructions that, when executed on a computer, cause the computer to perform the method of any one of the above aspects.

[0052] In a seventh aspect, a computer program product is provided, which contains instructions that, when executed on a computer, cause the computer to perform the method of any one of the above aspects.

[0053] The technical effects brought by any possible implementation of the second aspect to the seventh aspect can refer to the technical effects brought by the different possible implementation of the first aspect, which will not be repeated here.

[0054] It can be understood that the schemes in the above aspects can be combined as long as the schemes are not contradictory. BRIEF DESCRIPTION OF DRAWINGS

[0055] FIG. 1 is a schematic diagram of an architecture of a communication system provided by an embodiment of the present application;

[0056] FIG. 2 is a schematic diagram of an interaction flow of random access provided by an embodiment of the present application;

[0057] FIG. 3 is a schematic diagram of a PAPR parameter of a preamble provided by an embodiment of the present application;

[0058] FIG. 4 is a schematic diagram of an architecture of a communication device provided by an embodiment of the present application;

[0059] FIG. 5 is a schematic diagram of a flow of a communication method provided by an embodiment of the present application;

[0060] FIG. 6 is a schematic diagram of a frequency domain resource mapping manner of a preamble and a reserved symbol provided by an embodiment of the present application;

[0061] FIG. 7 is a schematic diagram of a flow of a terminal generating and sending a preamble provided by an embodiment of the present application;

[0062] FIG. 8 is a schematic diagram of an architecture of another communication device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0063] Hereinafter, the terms "first" and "second" are only used for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0064] It should be noted that the terms "exemplary" and "for example" are used herein to mean "an example of" or "one example, among others, of. " Any implementation described herein as "exemplary" or as an "example" is not necessarily to be construed as preferred or advantageous over other implementations. Rather, use of the terms "exemplary" or "example" is intended to present concepts in a particular manner.

[0065] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0066] First, the implementation environment and application scenario of the embodiments of the present application are briefly introduced.

[0067] In the embodiments of the present application, the network device is a device deployed in a wireless access network to provide wireless communication functions for terminal devices. The network device can include various forms of macro network devices, micro network devices (also known as small stations), relay stations, access points, etc. In systems using different wireless access technologies, the names of network devices may vary, such as the base transceiver station (BTS) in the Global System for Mobile Communication (GSM) or Code Division Multiple Access (CDMA) network, the NB (NodeB) in Wideband Code Division Multiple Access (WCDMA), the eNB or eNodeB (Evolutional NodeB) in Long Term Evolution (LTE). The network device can also be a wireless controller in a cloud radio access network (CRAN) scenario. The network device can also be a network device in a future 5G network or a future evolved public land mobile network (PLMN). The network device can also be a wearable device or a vehicle-mounted device. The network device can also be a transmission and reception point (TRP).

[0068] FIG. 1 is a schematic diagram illustrating a possible, non-limiting system. The communication method provided by embodiments of the present application can be applied to the network architecture shown in FIG. 1. As shown in FIG. 1, the communication system 10 includes a radio access network (RAN) 100 and a core network (CN) 200. The RAN 100 includes at least one RAN node (e.g., 110a and 110b in FIG. 1, collectively referred to as 110) and at least one terminal (e.g., 120a-120j in FIG. 1, collectively referred to as 120). Other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in FIG. 1), etc., can also be included in the RAN 100. The terminal 120 is connected to the RAN node 110 in a wireless manner. The RAN node 110 is connected to the core network 200 in a wireless or wired manner. The core network device in the core network 200 and the RAN node 110 in the RAN 100 can be different physical devices, respectively, or can be the same physical device integrated with the logical functions of the core network and the logical functions of the radio access network.

[0069] The RAN 100 can be a 3rd generation partnership project (3GPP) related cellular system, such as a 4G, 5G mobile communication system, or a future-oriented evolved system (e.g., a 6G mobile communication 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 that combines two or more of the above systems.

[0070] The RAN node 110, which can also be referred to as an access network device, a RAN entity, or an access node, etc., constitutes part of the communication system to help terminals implement wireless access. The multiple RAN nodes 110 in the communication system 10 can be nodes of the same type or nodes of different types. In some scenarios, the roles of the RAN node 110 and the terminal 120 are relative, for example, the network element 120i in FIG. 1 can be a helicopter or a drone, which can be configured as a mobile base station. For those terminals 120j that access the RAN 100 through the network element 120i, the network element 120i is a base station; but for the base station 110a, the network element 120i is a terminal. The RAN node 110 and the terminal 120 are sometimes referred to as communication apparatuses, for example, the network elements 110a and 110b in FIG. 1 can be understood as communication apparatuses with base station functions, and the network elements 120a-120j can be understood as communication apparatuses with terminal functions.

[0071] In a possible scenario, the RAN node can be a base station, an eNodeB, an access point (AP), a TRP, a gNB, a next generation base station in a 6th generation (6G) mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system, etc. The RAN node can be a macro base station (e.g., 110a in FIG. 1), a micro base station or an indoor station (e.g., 110b in FIG. 1), a relay node or a donor node, or a wireless controller in a CRAN scenario. Optionally, the RAN node can also be a server, a wearable device, a vehicle or a vehicle-mounted device, etc. For example, an access network device in a vehicle to everything (V2X) technology can be a road side unit (RSU). All or part of the functions of the RAN node in this application can also be implemented by software functions running on hardware, or by virtualized functions instantiated on a platform (e.g., a cloud platform). The RAN node in this application can also be a logical node, a logical module or software that can implement all or part of the functions of the RAN node.

[0072] In another possible scenario, multiple RAN nodes cooperate to assist a terminal to implement wireless access, and different RAN nodes respectively implement part of the functions of a base station. For example, the RAN node 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 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 remote radio unit (RRU), an active antenna processing unit (AAU), or a remote radio head (RRH).

[0073] 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 the ORAN system, the CU can also be referred to as O-CU (open CU), the DU can also be referred to as O-DU, the CU-CP can also be referred to as O-CU-CP, the CU-UP can also be referred to as O-CU-UP, and the RU can also be referred to as 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.

[0074] The 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, autonomous 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 the present application do not limit the device form of the terminal.

[0075] In addition, the terminal can also be a virtual reality (VR) terminal, an augmented reality (AR) terminal, or a mixed reality (MR) terminal. The VR terminal, AR terminal, and MR terminal can all be referred to as an extended reality (XR) terminal. The XR terminal can be a head-mounted device (such as a helmet, head-mounted display (HMD) or glasses), an all-in-one machine, a television, a display, a car, a vehicle-mounted device, a tablet or a smart screen, etc. The XR terminal can access the network through wireless or wired means, such as through WiFi or a 5G system. The XR terminal can present XR data to the user, and the user can experience diversified XR services by wearing or using the XR terminal.

[0076] The functions of other network elements included in FIG. 1 can refer to related descriptions in conventional technologies, and will not be described here.

[0077] The communication system 10 shown in FIG. 1 is only used for example and does not limit the technical solutions of the present application. Those skilled in the art should understand that in the specific implementation process, the communication system 10 can also include other devices, and the number of RAN nodes and terminals can also be determined according to specific needs, and is not limited.

[0078] Optionally, each network element or device (such as RAN node or terminal, etc.) in FIG. 1 of the present application can also be referred to as a communication device, which can be a general-purpose device or a special-purpose device, and the present application does not make specific limitations.

[0079] Optionally, the related functions of each network element or device (such as RAN node or terminal, etc.) in FIG. 1 of the present application can be implemented by one device, or by multiple devices together, or by one or more functional modules in a device, and the present application does not make specific limitations. It can be understood that the above functions can be network elements in hardware devices, software functions running on special hardware, or a combination of hardware and software, or virtualized functions instantiated on a platform (such as a cloud platform).

[0080] In the access control of the communication system such as 4G or 5G, the terminal can establish a connection with the network through random access to realize information interaction. The commonly used contention-based random access is usually divided into 4 steps, including message 1, message 2, message 3 and message 4, which carry different signaling or information respectively.

[0081] Taking the random access process of the 5G communication system as an example, the interaction process of the 4-step random access is briefly introduced. As shown in FIG. 2, it mainly includes the following steps.

[0082] 200: The network device sends configuration information to the terminal.

[0083] In an implementation mode, the network device can send synchronization signals and / or system information to the terminal at a specific resource, which includes configuration information, for indicating time-frequency resource information to the terminal.

[0084] For example, the network device can send the configuration information in a broadcast manner. In New Radio (NR), the synchronization signal sent by the network device can be a synchronization signal or a Physical Boardcast Channel (PBCH) block (Synchronization Signal Block / PBCH Block, SSB).

[0085] Correspondingly, after the terminal is powered on or needs to re-access the network, the terminal can scan the synchronization signal of the network device to perform downlink time and frequency synchronization, and receive configuration information about random access resources in system information.

[0086] 201: The terminal sends a message 1 to the network device.

[0087] The message 1 (Msg1) is a random access preamble (preamble or sequence) carried by a physical random access channel (PRACH), that is, a random access signal corresponding to the random access preamble is sent on a random access time and frequency resource. The message 1 can be used to initiate a connection request, a handover request, a synchronization request, or a scheduling request between the terminal and the network.

[0088] The terminal selects a specific random access resource according to the random resource configuration information, and the resource includes a time domain resource, a frequency domain resource, and / or a code domain resource (random access preamble), and sends a random access signal using the random access resource.

[0089] In an embodiment, a Zadoff-Chu (ZC) sequence can be used as an uplink synchronization sequence of the PRACH. The ZC sequence sent on the PRACH channel is also called a PRACH preamble.

[0090] For example, the LTE system supports two lengths of ZC sequences. According to an index sequence of a root sequence, a plurality of symbol sequences are generated by cyclically shifting the ZC root sequence, that is, a preamble. The symbol sequence length of the preamble can be N ZC = 839 or N ZC = 139.

[0091] For example, the specific process of generating the preamble by the terminal can include: the terminal determines at least one logical root sequence index configured by the network device (for example, indicated by a radio resource control (RRC) parameter prach-RootSequenceIndex), and generates the preamble by cyclically shifting the root sequence according to the number of bits of the cyclic shift.

[0092] The network device can generate a total of 64 preambles. If the preamble sequence generated by cyclically shifting the root sequence corresponding to the logical root sequence index is less than 64, the terminal can continue to generate the preamble sequence using the root sequence corresponding to the next logical root sequence index until all 64 symbol sequences are generated. The preamble is first classified according to the cyclic shift length C VIncrement, the logical root sequence index is numbered in ascending order from 0 to 63.

[0093] Wherein, the root sequence can be defined as:

[0094] Cyclic shift definition:

[0095] After the root sequence is subjected to cyclic shift, the ZC time domain sequence set obtained is: u,v (n)=x u ((n+C v )mod L RA ).

[0096] L RA : The symbol sequence length of the preamble: the format of different preambles can correspond to different sequence lengths.

[0097] x u : Zadoff-Chu sequence, which depends on the sequence length L RA and the sequence number u.

[0098] u: sequence number. Usually, the network device does not directly configure u, but configures the logical root sequence index corresponding to u, and the root sequence index and u are one-to-one corresponding.

[0099] N CS : Cyclic shift unit, the terminal can determine N CS according to the high layer parameter such as zeroCorrelationZoneConfig issued by the cell according to the protocol.

[0100] Correspondingly, the network device receives the message 1 from the terminal.

[0101] 202: The network device sends message 2 to the terminal.

[0102] Illustratively, after the network device receives the message 1 of the terminal, the timing advance of the terminal can be estimated according to the preamble, and the user is replied with message 2 (message 2, Msg2). Message 2 can also be called random access response (random access response, RAR) message, which is the response of the network device to the received message 1. Optionally, one message 2 can include the response corresponding to multiple Msg1.

[0103] Optionally, the message 2 can include the time-frequency resource position, modulation and coding mode and other configuration information used by the terminal to send message 3 for conflict resolution.

[0104] 203: The terminal sends message 3 to the network device.

[0105] After the terminal receives the message 2, the terminal can send a message 3 (Msg3) which can also be referred to as a first uplink scheduling transmission according to the configuration in the message 2.

[0106] The message 3 transmission content is a high layer message, for example, a connection establishment request message (which can be specifically an identification information of a user initiating a connection request). The message is used for contention resolution. If multiple different terminals use the same Msg1 for random access, whether there is a conflict can be determined through the Msg3 and the Msg4.

[0107] 204: The network device sends a message 4 to the terminal.

[0108] After the network device receives the message 3, the network device replies to the terminal with a message 4 (Msg4) to indicate that the terminal successfully accesses.

[0109] In addition, in order to reduce the access time of the 4-step random access, a 2-step random access can also be used. In the 2-step random access, a message A and a message B are included, wherein the message A includes a preamble and first data information (for example, similar to the message 1 and the message 3 in the 4-step random access), and the message B includes contention resolution and uplink scheduling (for example, similar to the message 2 and the message 4 in the 4-step random access).

[0110] In the above embodiment, if the uplink synchronization sequence of the terminal uses a ZC sequence, the PAPR of part of the ZC sequence time domain signal can be too high. The PA will produce nonlinear distortion in the high power area of the signal, which causes the time domain signal to need to be power backed off according to the maximum value of the signal, so that the power of the signal that can be sent is reduced, and the coverage of the random access is limited. As shown in FIG. 3, the horizontal coordinate represents the ZC sequence number of the generated preamble, and the vertical coordinate represents the corresponding PAPR. As can be seen from FIG. 3, the PAPR of part of the ZC sequence of the preamble with a symbol length of 139 is higher than 6dB, and the PAPR of part of the ZC sequence of the preamble with a symbol length of 839 is higher than 7dB.

[0111] It should be understood that in the embodiments of the present application, the specific algorithm for generating the preamble symbol sequence is not limited to the ZC sequence. In the embodiments of the present application, the ZC sequence is only taken as an example, and the preamble can also be generated through other algorithms for generating symbol sequences. For details, reference can be made to relevant technical descriptions, and the present application does not limit this.

[0112] Based on the above problems, the application provides a communication method and device, by sending a preamble, at the same time, defining and reserving additional frequency domain resources outside the frequency domain bandwidth of the preamble, for sending a reserved symbol sequence, the reserved symbol sequence does not carry useful information, but is used to generate a signal in the time domain to offset the time domain power peak, by reducing the peak of the overall time domain signal power of the transmitted signal, to reduce the PAPR of the transmitted preamble, thereby improving the coverage of random access and improving the communication efficiency.

[0113] It can be understood that the devices or network elements in the above Figure 1 can communicate directly or through forwarding of other devices, and the embodiments of the application do not make specific limitations.

[0114] It can be understood that the above Figure 1 is only a schematic diagram and does not constitute a limitation on the applicable scenarios of the technical solutions provided by the application. Those skilled in the art should understand that in the specific implementation process, the communication system can include fewer devices or network elements than those shown in Figure 1, or the communication system can also include other devices or other network elements, and the number of devices or network elements in the communication system can also be determined according to specific needs.

[0115] It should be noted that the communication system shown in Figure 1 is only for example and is not intended to limit the technical solutions of the application. Those skilled in the art should understand that in the specific implementation process, the communication system can also include other devices or network elements, and the number of each network element can also be determined according to specific needs.

[0116] Optionally, each network element in Figure 1 of the embodiments of the application can be a functional module in one device. It can be understood that the above functions can be network elements in a hardware device, such as a communication chip in a mobile phone, or a software function running on a dedicated hardware, or a virtualized function instantiated on a platform (such as a cloud platform).

[0117] For example, each network element in Figure 1 or Figure 2 can be implemented by the communication device 400 in Figure 4. Figure 4 shows a hardware structure diagram of a communication device applicable to the embodiments of the application. The communication device 400 includes at least one processor 401, a communication line 402, a memory 403, and at least one communication interface 404.

[0118] The processor 401 can be a general central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of programs of the application solutions.

[0119] The communication line 402 can include a path for transmitting information between the above-mentioned components, such as a bus.

[0120] The communication interface 404 is configured to communicate with other devices or communication networks using any transceiver-like device, such as an Ethernet interface, a RAN interface, a wireless local area networks (WLAN) interface, etc.

[0121] The memory 403 can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, a magnetic disk storage or other magnetic storage devices, or any other medium capable of storing desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to this. The memory can exist independently, and be connected to the processor through the communication line 402. The memory can also be integrated with the processor. The memory provided by the embodiments of the present application can generally be non-volatile. The memory 403 is configured to store computer-executable instructions related to the schemes provided by the embodiments of the present application, and the processor 401 is configured to control the execution of the computer-executable instructions. The processor 401 is configured to execute the computer-executable instructions stored in the memory 403, so as to implement the schemes provided by the embodiments of the present application.

[0122] Optionally, the computer-executable instructions in the embodiments of the present application can also be referred to as application program codes, and the embodiments of the present application are not limited in this regard.

[0123] In a specific implementation, as an embodiment, the processor 401 can include one or more CPUs, such as CPU0 and CPU1 in FIG. 4.

[0124] In a particular implementation, as one example, the communication apparatus 400 can include multiple processors, such as the processor 401 and the processor 407 in FIG. 4. Each of these processors can be a single-CPU processor or a multi-CPU processor. A processor here can refer to one or more devices, circuits, and / or processing cores for processing data, such as computer program instructions.

[0125] In a particular implementation, as one example, the communication apparatus 400 can also include an output device 405 and an input device 406. The output device 405 is in communication with the processor 401 and can display information in various ways. For example, the output device 405 can be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, a projector, or the like. The input device 406 is in communication with the processor 401 and can receive user input in various ways. For example, the input device 406 can be a mouse, a keyboard, a touch screen device, a sensor device, or the like.

[0126] The communication apparatus 400 described above can be a general-purpose device or a special-purpose device. In a particular implementation, the communication apparatus 400 can be a laptop computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal apparatus, an embedded device, or a device having a similar structure as that in FIG. 4. The embodiments of the present application do not limit the type of the communication apparatus 400.

[0127] The communication method provided by the embodiments of the present application is described below in detail.

[0128] It should be noted that the names of messages between network elements or the names of parameters in the messages in the following embodiments of the present application are only examples, and other names can also be used in a particular implementation, which are not limited in the embodiments of the present application.

[0129] In addition, "sending information to a terminal" in the present application can be understood as that the destination of the information is the terminal. This can include directly or indirectly sending information to the terminal. "Receiving information from a terminal" can be understood as that the source of the information is the terminal, and this can include directly or indirectly receiving information from the terminal. The information can be processed as necessary between the source and the destination of the information, such as format change, etc., but the destination can understand the valid information from the source. Similar expressions in the present application can be understood similarly, and will not be described here.

[0130] It can be understood that part or all of the steps in the embodiments of the application are only examples, and the embodiments of the application can also perform other steps or variations of various steps. In addition, various steps can be performed in different orders as presented in the embodiments of the application, and it is possible that not all steps in the embodiments of the application are to be performed.

[0131] As shown in FIG. 5, the application provides a communication method applied to a network device and a terminal, which can include the following steps.

[0132] 501: The network device sends a first message to the terminal, indicating the configuration information of the preamble and the first signal.

[0133] That is, the network device can indicate the configuration information of the preamble and the configuration information of the first signal to the terminal through the first message.

[0134] The first signal can be a reserved symbol sequence of the preamble, and can also be referred to as a reserved symbol or a reserved signal.

[0135] The first signal does not carry useful information (valid data), but is used to generate a signal that cancels the time domain signal power peak in the time domain, reduces the overall time domain signal power peak of the transmitted signal, reduces the PAPR of the transmitted preamble, and thus improves the coverage of random access and communication efficiency.

[0136] Correspondingly, the terminal receives the first message from the network device, obtains the configuration information of the preamble and the first signal, and thus can perform step 502 according to the configuration information to send the preamble and the first signal to the network device.

[0137] 502: The terminal sends a second message including the preamble and the first signal to the network device according to the configuration information.

[0138] The average transmission power of the first signal is less than or equal to the average transmission power of the preamble, and the PAPR can be reduced by reducing the peak value of the overall signal transmission function of the second message.

[0139] In an embodiment, the terminal transmits the preamble and the first signal in the same time domain resource, and transmits the preamble and the first signal in different frequency domain resources.

[0140] In an embodiment, in the aforementioned step 501, the configuration information of the preamble can specifically indicate: the root sequence number corresponding to the preamble, the cyclic shift unit N CS , and / or the frequency domain resource position of the transmitted preamble, etc. The specific configuration method can refer to the related technical and protocol content, and will not be described here.

[0141] The root sequence refers to a basic symbol sequence used to generate a specific symbol sequence according to a certain algorithm. In this application, the root sequence can be applied to generate a symbol sequence of a preamble. For example, according to the algorithm of a ZC sequence, a ZC sequence can be obtained by cyclically shifting a root sequence of a certain length, as a preamble.

[0142] In an embodiment, the configuration information in the foregoing step 501 can include one or more root sequence numbers, which are used to indicate corresponding root sequences; before the terminal sends the second message, a symbol sequence of a preamble can be generated according to one or more root sequences and a cyclic shift length. For specific processes, reference can be made to the foregoing generation process and formula of a ZC sequence, which will not be described here again.

[0143] In addition, the generation method of the preamble in this application is not limited to the foregoing method of generating a ZC sequence, and a symbol sequence of a preamble can also be obtained through other algorithms.

[0144] In this application, the terminal generates a first signal (i.e., a reserved symbol sequence of a preamble), which can be specifically generated in the following two ways.

[0145] Method one: the network device sends related configurations of a reserved symbol to the terminal, and the terminal generates and sends the reserved symbol by itself.

[0146] That is, in step 501, the first message sent by the network device to the terminal can include related configuration information of generating the first signal.

[0147] In an embodiment, the configuration information of the first signal can specifically indicate a subcarrier length corresponding to the first signal, which can also be referred to as a length of a reserved subcarrier (Tone Reservation, TR), i.e., a maximum length of a reserved symbol that can be generated and placed by the terminal.

[0148] For example, the network device configures a subcarrier length corresponding to the first signal of the terminal as L TR The terminal can generate a reserved symbol with a length less than or equal to L TR on a frequency domain resource corresponding to the reserved symbol, such as a reserved symbol with a length l TR ≤L TR , and send the reserved symbol together with the preamble, to reduce the PAPR of the sent preamble.

[0149] Optionally, the subcarrier length corresponding to the first signal can be agreed in a protocol or preconfigured, such as being set to 20, 40 or 80, etc. For example, the protocol supports multiple sets of L TR configurations for the terminal to select, and the configuration information in the first message can indicate one of them. For example, as shown in Table 1 below, the configuration information can include one or more parameters in the table.

[0150] Table 1

[0151] It should be understood that the value of the subcarrier length corresponding to the first signal can be associated with at least one of the following information: the subcarrier length L of the preamble RA , the generation format of the preamble, the root sequence corresponding to the preamble (including the root sequence number u corresponding to the preamble), the subcarrier spacing of the PRACH, the frequency band of the physical random access channel, or the frequency domain resource mapping manner of the first signal corresponding to the preamble.

[0152] As can be seen from the foregoing FIG. 3, the PAPR of the preamble corresponding to some root sequence numbers is low, and the reserved symbol (such as the first signal) can not be configured, so in some embodiments, the length of the reserved subcarrier can be configured as 0, or the length of the reserved subcarrier is not configured.

[0153] It should be noted that the specific values of L RA , L TR or u in the present application are only used for illustration, and other values can be defined in specific implementations, which are not limited in the present application.

[0154] In addition, the configuration information sent by the network device can include the logical sequence number (such as the index number in Table 1) corresponding to the reserved subcarrier length configuration, which is used to configure L TR to the terminal; or the ratio or difference of the subcarrier length of the first signal corresponding to the preamble can be included.

[0155] For example, the configuration information indicates that the ratio of the subcarrier length of the first signal corresponding to the preamble is 1 / 6, then the terminal can obtain the subcarrier length of the first signal as 23 according to the subcarrier length of the preamble as 139; or the terminal can obtain the subcarrier length of the first signal as 140 according to the subcarrier length of the preamble as 839.

[0156] In an embodiment, the configuration information of the first signal can also indicate the frequency domain resource to which the first signal is mapped, which can also be referred to as the frequency domain resource corresponding to the reserved symbol, such as the first frequency domain resource, that is, to indicate that the terminal can map the generated reserved symbol sequence to the first frequency domain resource and send it. Wherein, the first frequency domain resource is the resource configured by the network for the terminal to send the preamble.

[0157] Wherein, the frequency domain resource corresponding to the reserved symbol is related to the subcarrier length L TR of the reserved symbol, and the protocol or pre-configuration can support multiple sets of frequency domain resources for the terminal to select, and the related resource mapping manner will be described later, which will not be described here.

[0158] In an embodiment, the configuration information of the first signal can further indicate a maximum value of the average transmission power of the first signal, which can also be referred to as an energy threshold value of the reserved symbol, for indicating a maximum value of the energy of the reserved symbol allowed to be placed on the sub-carrier where the reserved symbol sequence (e.g., the first signal) is located, such as being configured as E, i.e., the average transmission power of the terminal sending the reserved symbol sequence (e.g., the first signal) needs to be less than or equal to E.

[0159] Optionally, the configuration information can include an index of one or more root sequences; and / or, the configuration information includes the average transmission power of one or more symbol sequences corresponding to the first signal.

[0160] Further, the protocol or pre-configuration can set the same energy threshold value for all reserved sub-carriers, such as defining the average transmission power of the reserved sub-carrier as E TR . Alternatively, the protocol or pre-configuration can set different energy threshold values for different reserved sub-carriers, such as defining the average transmission power of the reserved sub-carrier i as E TR,i .

[0161] For example, the configuration information can indicate that the maximum value of the average transmission power of the first signal includes a first threshold value and a second threshold value, wherein the average transmission power of the first sub-carrier in the first signal is less than or equal to the first threshold value, and the average transmission power of the second sub-carrier in the first signal is less than or equal to the second threshold value. Wherein the first frequency domain resource includes the first sub-carrier and the second sub-carrier, that is, the network can correspondingly allocate different average transmission powers for different sub-carriers carrying the preamble.

[0162] Alternatively, in a possible embodiment, the configuration information can indicate the relative relationship between the average energy of the reserved symbol and the sub-carrier of the preamble, such as indicating the maximum value of the difference or ratio of the average transmission power of the first signal and the preamble, or indicating the maximum value of the difference or ratio of the average transmission power of the first signal and the preamble.

[0163] For example, the protocol agreement or pre-configuration can set the ratio of the average transmission power of the first signal and the preamble, such as setting it to -3dB or -6dB, i.e., indicating that the ratio of the transmission power of the first signal and the transmission power of the preamble does not exceed -3dB or -6dB. Alternatively, the protocol supports multiple sets of relative relationships between the average energy of the reserved symbol and the sub-carrier of the preamble, and the configuration information in the first message can indicate one of them, such as Table 2 below. The configuration information can configure multiple ratios of the average transmission power of the first signal and the preamble, such as ΔE.

[0164] Table 2

[0165] It should be understood that the relative relationship between the first signal and the average energy of the subcarriers of the preamble can be associated with at least one of the following: the subcarrier length L of the preamble RA , the generation format of the preamble, the root sequence corresponding to the preamble (including the root sequence number u corresponding to the preamble), the frequency domain resource mapping manner of the first signal corresponding to the preamble, the subcarrier spacing of the PRACH, or the frequency band of the physical random access channel, etc.

[0166] As can be seen from the foregoing FIG. 3, the PAPR of the preamble corresponding to some root sequence numbers is relatively low, and the reserved symbol (such as the first signal) can not be configured, or the reserved symbol and the transmission function of the preamble can be the same. Therefore, in some embodiments, the difference between the average transmission power of the first signal and the preamble can be configured as 0, or the value is not configured.

[0167] It should be noted that the specific values of L RA , L TR or △E in the present application are only used for illustration, and other values can be defined in specific implementations, which are not limited in the present application.

[0168] In an embodiment, the configuration information of the first signal can also indicate a non-orthogonal signal energy threshold E0 outside the reserved frequency domain resource. That is, in the present application, the terminal is allowed to send a reserved symbol sequence with energy less than or equal to E0 on the frequency domain resource of the non-reserved symbol, for example, the second frequency domain resource.

[0169] For example, the network device configures the terminal to send a reserved symbol sequence on the first frequency domain resource, and the terminal can generate the first signal, send part of the symbol sequence of the first signal through the first frequency domain resource, and non-orthogonally place part of the symbol of the first signal through the second frequency domain resource (a frequency domain resource other than the first frequency domain resource). In this embodiment, the configuration information of the first signal can also indicate the maximum value of the average transmission power corresponding to the part of the symbol sequence of the first signal sent through the second frequency domain resource, or the maximum value of the difference or ratio of the average transmission power of the preamble and the part of the symbol sequence of the first signal sent through the second frequency domain resource.

[0170] Method two: the network device sends the symbol sequence required for the terminal to generate the first signal, or the root sequence number corresponding to the generation of the symbol sequence, to the terminal, so that the terminal generates the first signal.

[0171] In an embodiment, the first signal can be generated according to the preamble. For example, the terminal can generate the first signal based on a certain algorithm according to the generated preamble, that is, generate the reserved symbol sequence corresponding to the preamble. The specific algorithm for generating the reserved symbol is not limited in the present application.

[0172] Specifically, before the terminal sends the second message, it also includes: the terminal generating one or more symbol sequences included in the first signal based on the symbol sequence of the preamble.

[0173] Alternatively, in one implementation, the first signal may be generated based on the root sequence corresponding to the preamble. For example, the network device may generate at least one reserved symbol sequence based on a certain algorithm according to the root sequence corresponding to the preamble. Taking the network device generating the first symbol sequence as an example, the network device may send the first symbol sequence to the terminal. The terminal may generate one or more symbol sequences according to the first symbol sequence and the corresponding algorithm, and send them as the first signal simultaneously with the preamble.

[0174] For example, a network device can generate a first symbol sequence, such as x, based on the root sequence. TR (u,0), and x TR (u,0) is sent to the terminal. The terminal then uses x... TR (u,0) and the length of the cyclic shift C v The corresponding reserved symbol sequence x can be calculated using a formula. TR (u,C v ), which is sent simultaneously with the preamble as the first signal.

[0175] In this implementation, the configuration information corresponding to the first signal (reserved symbol) sent by the network device to the terminal may further include at least one of the following: one or more root sequence numbers u corresponding to the preamble, the frequency domain resource mapping position corresponding to the reserved symbol, or the relevant configuration of the transmit power of the reserved symbol. Furthermore, the configuration information includes, but is not limited to, one or more of the above, used to instruct the terminal to generate and send the reserved symbol.

[0176] In another implementation, the multiple reserved symbol sequences generated by the terminal may correspond to one or more of the following situations:

[0177] 1. Reserved symbols corresponding to different root sequences;

[0178] 2. Reserved symbols corresponding to different transmit power configurations;

[0179] 3. Reserved symbols for different subcarrier lengths;

[0180] 4. Reserved symbols corresponding to different frequency domain mapping methods for reserved subcarriers.

[0181] The following section introduces several different frequency domain resource mapping methods for the first signal (i.e., reserved symbols).

[0182] The frequency domain resource mapping can be predefined by a protocol, or the network device can send relevant configuration to the terminal to indicate the frequency domain mapping of the reserved symbol to the terminal. For example, the configuration information in the step 501 can further include first indication information for indicating the frequency domain resource mapping mode of the first signal corresponding to the preamble.

[0183] In an embodiment, the frequency domain resource mapping mode of the reserved symbol can include at least one of the following mapping modes.

[0184] 1. The reserved symbol is mapped to the left side of the preamble.

[0185] For example, as shown in mode a in FIG. 6, the frequency domain range mapped by the reserved symbol is smaller than the frequency domain range mapped by the preamble.

[0186] L TR represents the subcarrier length of the reserved symbol on the left side of the preamble, and the length L RA of the preamble.

[0187] For example, the network device can indicate the specific value of L TR to the terminal, or indicate the ratio of L TR to L RA to inform the terminal of the length of the reserved symbol on the left side of the preamble. For example, when L RA = 139, L TR1 = 8, 20, 32,...; or L TR1 : L RA = 1 / 8, 1 / 4, 1 / 2,...

[0188] k1 represents the subcarrier length of the guard interval required by the reserved symbol on the left side of the preamble, and the length of the guard interval.

[0189] For example, the network device can indicate the specific value of k1 to the terminal, or can define multiple sets of configurations by a protocol and indicate one of the configurations by relevant signaling to inform the terminal of the subcarrier length of the guard interval required by the reserved symbol on the left side of the preamble. For example, when L RA = 139, k1 = 0, 2,...

[0190] is the subcarrier length of the guard interval required by the left side or the right side of the preamble.

[0191] represents the number of resource blocks (RB) occupied by the preamble and the guard interval on both sides.

[0192] M represents the number of RBs occupied by the reserved symbol on the left side of the preamble and the guard interval on both sides of the reserved symbol.

[0193] In addition, the network device can also indicate the total number of RBs occupied by the preamble, the reserved symbol and the guard interval to the terminal through configuration information or special signaling, to implicitly indicate the M, so that the terminal can determine the M according to the number of RBs occupied by the preamble and the number of RBs occupied by the reserved symbol and the guard interval on both sides.

[0194] In the present application, the guard interval can be a single-sided (left or right) reserved or a two-sided (left and right) guard interval, which is not limited in the present application.

[0195] 2. The reserved symbol is mapped to the right side of the preamble.

[0196] For example, as shown in mode b in FIG. 6, the frequency domain range mapped by the reserved symbol is greater than the frequency domain range mapped by the preamble.

[0197] L TR respectively represent the subcarrier length of the right reserved symbol, and the length L RA of the preamble.

[0198] k1 represents the subcarrier length of the guard interval required by the right reserved symbol, and the length of the guard interval.

[0199] M represents the number of RBs occupied by the right reserved symbol and the guard interval on both sides.

[0200] 3. The reserved symbol is mapped to both ends of the preamble.

[0201] For example, as shown in mode c in FIG. 6, the frequency domain range mapped by part of the symbol sequence in the reserved symbol is less than the frequency domain range mapped by the preamble; and the frequency domain range mapped by another part of the symbol sequence in the reserved symbol is greater than the frequency domain range mapped by the preamble.

[0202] L TR1 , L TR2 respectively represent the subcarrier length of the left and right reserved symbols of the preamble, and the length L RA of the preamble, which can be indicated to the terminal by the aforementioned configuration mode of L TR , which will not be described here.

[0203] M1, M2 respectively represent the number of RBs occupied by the left and right reserved symbols of the preamble, which can be used to determine the subcarrier length of the guard interval on the other side of the reserved symbol.

[0204] k1, k2 represent the subcarrier length of the guard interval required by the left and right reserved symbols of the preamble, and the length of the guard interval. Specifically, the terminal can be indicated by the aforementioned configuration mode of k1, which will not be described here.

[0205] 4. The reserved symbols are arranged in a comb shape with the symbol sequence of the preamble.

[0206] For example, as shown in mode d in FIG. 6, the terminal can divide the generated symbol sequence of the preamble into multiple sequence blocks and map the sequence blocks to the frequency domain resource positions corresponding to the preamble at equal intervals. In addition, in a similar manner, the terminal divides the generated reserved symbol sequence into multiple sequence blocks and places the sequence blocks at the frequency domain positions between the symbol sequence blocks of the preamble in a comb shape (or cross shape).

[0207] wherein k1 represents the subcarrier length of the guard interval required on the right side or the left side of the signal transmitted by the terminal, and the length of the guard interval.

[0208] N represents the number of RBs occupied by the reserved symbols and the preamble.

[0209] Optionally, the first indication information included in the configuration information can be used to indicate at least one of the following information: the symbol sequence of the first signal is located on the left side of the preamble, the symbol sequence of the first signal is located on the right side of the preamble, part of the symbol sequence of the first signal is located on the left side of the preamble, and part of the symbol sequence of the first signal is located on the right side of the preamble, or the symbol sequence of the first signal is arranged in a comb shape with the symbol sequence of the preamble.

[0210] It should be understood that the "left side", "right side", "both sides" or "comb shape placement / arrangement" and the like in the mapping mode of the frequency domain resource refer to the positional relationship of the frequency domain resource to which the symbol sequence is mapped, such as the size relationship of the frequency points corresponding to the mapped frequency domain positions. As shown in FIG. 6, the frequency points from left to right correspond to the frequency domain values of the frequency points from small to large.

[0211] Through the above four resource mapping modes, the terminal can obtain the related information of the frequency domain resource mapping corresponding to the reserved symbols. Different frequency domain resource mapping modes correspond to different values of specific parameters under different modes, which are used to support the terminal to adopt different configurations of the reserved symbols according to its own capability or different reference signal receiving power (RSRP).

[0212] Further, in an embodiment, if the symbol sequence on the left side of the preamble is a second symbol sequence, the guard interval on the left side and / or the right side of the second symbol sequence is a first interval; if the symbol sequence on the right side of the preamble is a third symbol sequence, the guard interval on the left side and / or the right side of the third symbol sequence is a second interval, the first indication information can further include at least one of the following information:

[0213] the subcarrier length L of the second symbol sequence TR1a subcarrier length of a first interval on a left side and / or a right side of the second symbol sequence, such as k1; a number of resource blocks occupied by the second symbol sequence and the first interval, such as M1; or a subcarrier length of the third symbol sequence L TR2 a subcarrier length of a second interval on a left side and / or a right side of the third symbol sequence, such as k2; a number of resource blocks occupied by the third symbol sequence and the second interval, such as M2; or a subcarrier length of the third interval, a number of resource blocks occupied by the first signal and the preamble, and the like, wherein the third interval is a guard interval of the symbol sequence of the first signal and the preamble in a comb arrangement.

[0214] It should be understood that the configuration information sent by the network device to the terminal, or the indication sent to the terminal, can be sent to the terminal in a broadcast manner, for example, in a scenario where the terminal performs initial access. Alternatively, the network device can indicate the relevant configuration to the terminal through dedicated signaling, for example, in a scenario where the terminal performs cell switching.

[0215] In one way, the protocol can predefine a plurality of configuration combinations to support different reserved symbol lengths and frequency domain resource mapping manners corresponding to the reserved symbols. The plurality of configuration combinations can include one or more of the above four frequency domain resource mapping manners, and different combinations of parameter values in a specific way. The network device can send a logical sequence number corresponding to the configuration combination through related configuration signaling or broadcast, to notify the terminal of the frequency domain resource mapping manner of the reserved symbol currently adopted.

[0216] It should be noted that the configuration combination can include all or part of the parameters in the above manner, and the remaining part can still be configured to the terminal through the network device related signaling.

[0217] In another way, the network device can send the frequency domain resource mapping manner of the reserved symbol and the value of the corresponding specific parameter in this way to the terminal through related configuration signaling or broadcast.

[0218] In addition, after the terminal obtains the symbol sequence of the preamble and the symbol sequence of the first signal through the above manner, the terminal can generate the time domain symbol to be sent according to the uplink single carrier link transmission process. Exemplarily, the implementation process of the terminal can be as shown in FIG. 7, and the process of generating the preamble by the terminal can include: determining a root sequence, determining the preamble through cyclic shift, performing discrete Fourier transform (DFT), performing frequency domain resource mapping on the preamble, upsampling-inverse fast Fourier transform (IFFT), and sending the time domain signal of the preamble.

[0219] In addition, for the scenario of carrying the reserved symbol in the preamble, the method further includes: reserving additional subcarriers outside the bandwidth of the preamble for carrying the reserved symbol, such as the first signal; the terminal generates / acquires the reserved symbol, performs frequency domain resource mapping on the preamble and the reserved symbol, performs up-sampling IFFT, and transmits the reserved symbol and the preamble at the same time, so as to reduce the peak value of the time domain power of the overall transmitted signal, reduce the PAPR, improve the coverage of the preamble, improve the coverage of the random access, and improve the communication efficiency.

[0220] It should be understood that the implementation process shown in FIG. 7 is only an example, and the application does not limit the sequence of the various processes included therein. For example, the terminal can generate the preamble while obtaining the reserved symbol, for example, the reserved symbol can be obtained according to the root sequence; or the preamble can be generated first, and then the reserved symbol can be generated according to the preamble. The specific implementation of the terminal generating and transmitting the second message can include one or more processing steps included in FIG. 7, and can also include other steps outside the illustration, which are not limited by the application.

[0221] In an embodiment, when the terminal does not receive the access response (such as RAR) message of the network device within a certain time, it means that the preamble sending fails this time, and the preamble retransmission (existing process) can be performed.

[0222] In an embodiment, the method can further include the following steps:

[0223] 503: The terminal transmits the preamble and the second signal to the network device.

[0224] For example, if the number of retransmissions of the preamble in the second message of step 502 is greater than or equal to the first threshold, the terminal can transmit the preamble and the second signal to the network device. The second signal is generated according to the preamble or the root sequence (the root sequence used to generate the preamble), and the average transmission power of the second signal is less than or equal to the average transmission power of the preamble.

[0225] In addition, the average transmission power of the second signal is greater than or equal to the average transmission power of the first signal, and / or the length of the subcarrier corresponding to the second signal is greater than or equal to the length of the subcarrier corresponding to the first signal.

[0226] That is, in the present application, the terminal can improve the success probability of the preamble retransmission by increasing the transmission power of the reserved symbol sequence corresponding to the preamble, or increasing the length of the reserved symbol sequence, and the like.

[0227] For example, in one mode, if the number of retransmissions of the preamble reaches or exceeds a preset threshold, the terminal can generate a second signal with longer subcarriers of reserved symbols according to a plurality of sets of ways of generating reserved symbol sequences configured by the network device, and retransmit the preamble simultaneously.

[0228] Alternatively, in another mode, if the number of retransmissions of the preamble reaches or exceeds a preset threshold, the terminal can receive indication information or configuration information from the network device, indicating that the terminal can increase the transmission power of the reserved symbols, or indicating that the terminal uses a larger frequency domain resource position corresponding to the subcarrier length of the reserved symbols.

[0229] In one embodiment, before the terminal performs step 503, the method can further include the following steps: the network device sends first configuration information to the terminal, and the first configuration information can be used to indicate the maximum value of the average transmission power of the second signal, the frequency domain resource of the second signal, and / or the maximum value of the subcarrier length corresponding to the second signal. Thus, the terminal can determine or generate the second signal according to the first configuration information, and transmit the second signal to the network device simultaneously with the preamble.

[0230] It should be noted that in the above embodiments of the present application, the related processes of the terminal sending the preamble are mainly described, and it can be known from the random access process shown in FIG. 2 that after the embodiment shown in FIG. 5, steps 202-204 shown in FIG. 2 can be further performed, and the present application does not limit this.

[0231] The above embodiments of the present application propose a scheme for reducing the PAPR of the terminal sending the preamble, which places reserved symbols outside the frequency domain resource of the preamble to offset the time domain power peak value of sending the preamble, thereby reducing the PAPR of sending the preamble, improving the random access coverage, and improving the communication efficiency.

[0232] The various embodiments mentioned in the foregoing of the present application can be combined without contradiction in scheme, and are not limited.

[0233] The above mainly introduces the scheme provided by the present application from the perspective of interaction between various network devices. Correspondingly, the present application also provides a communication device, which can be a terminal in the above method embodiments, or a component such as a chip that can be used for a terminal; or can be a network device in the above embodiments, or a component such as a chip that can be used for a network device.

[0234] It should be understood that, for achieving the above functions, the communication apparatus includes hardware structures and / or software modules corresponding to each function. Those skilled in the art can easily realize the units and algorithm operations of each example described in combination with the embodiments disclosed in the present document. The present application can be realized in the form of hardware or a combination of hardware and computer software. Whether a certain function is realized in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0235] It should be understood that the above describes the interaction between each network element by taking the terminal or network device as an example. In fact, the processing performed by the terminal is not limited to being performed by a single network element, and the processing performed by the network device is not limited to being performed by a single network element.

[0236] The present application can divide the functional modules of the communication apparatus according to the above method examples. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The integrated module can be realized in the form of hardware or software functional module. It should be understood that the division of modules in the present application is illustrative, and is only a logical functional division. Actual implementation can have another division manner.

[0237] For example, in the case of dividing each functional module in an integrated manner, FIG. 8 shows a structural schematic diagram of a communication apparatus 800. The communication apparatus 800 includes an interface module 801 and a processing module 802.

[0238] In some embodiments, the communication apparatus 800 can further include a storage module (not shown in FIG. 8) for storing program instructions and data.

[0239] Exemplarily, the communication apparatus 800 can be used to realize the functions of the terminal in the above embodiments. The communication apparatus 800 is, for example, the terminal described in each of the embodiments of FIG. 5.

[0240] The interface module 801 can be used to receive a first message from a network device, the first message indicating configuration information of a preamble and a first signal.

[0241] The processing module 802 is configured to send a second message to the network device according to the configuration information, the second message including the preamble and the first signal, wherein the first signal is generated according to the preamble or a root sequence, and the average transmission power of the first signal is less than or equal to the average transmission power of the preamble.

[0242] In an embodiment, the configuration information further indicates at least one of: a subcarrier length corresponding to the first signal, a ratio of the subcarrier length corresponding to the first signal to the subcarrier length corresponding to the preamble, an index number of the subcarrier length corresponding to the first signal, a first frequency domain resource corresponding to the first signal, a maximum value of an average transmission power corresponding to the first signal, a maximum value of a difference or a ratio of the average transmission power of the preamble to the first signal, a maximum value of an average transmission power corresponding to the partial symbol sequence of the first signal transmitted through the second frequency domain resource, or a maximum value of a difference or a ratio of the average transmission power of the preamble to the partial symbol sequence of the first signal transmitted through the second frequency domain resource. The first frequency domain resource is a resource configured by the network for the terminal to transmit the preamble, and the second frequency domain resource is a frequency domain resource other than the configured resource.

[0243] In an embodiment, the maximum value of the average transmission power corresponding to the first signal includes a first threshold value and a second threshold value, an average transmission power of a first subcarrier in the first signal is less than or equal to the first threshold value, and an average transmission power of a second subcarrier in the first signal is less than or equal to the second threshold value. The first frequency domain resource includes the first subcarrier and the second subcarrier. That is, the network can assign different average transmission powers to different subcarriers carrying the preamble.

[0244] In an embodiment, the subcarrier length corresponding to the first signal is associated with at least one of: a subcarrier length of the preamble, a generation format of the preamble, a root sequence corresponding to the preamble, a subcarrier spacing of a physical random access channel, a frequency band of the physical random access channel, or a frequency domain resource mapping manner corresponding to the first signal and the preamble.

[0245] In an embodiment, a time domain resource corresponding to the transmission of the preamble and the transmission of the first signal is the same, and a frequency domain resource corresponding to the transmission of the preamble and the transmission of the first signal is different.

[0246] In an embodiment, the configuration information indicates one or more root sequences; and before the second message is transmitted, the method further includes: generating a symbol sequence of the preamble according to the one or more root sequences and a cyclic shift length.

[0247] In an embodiment, the processing module 802 is configured to generate one or more symbol sequences included in the first signal according to the symbol sequence of the preamble.

[0248] In an embodiment, the configuration information comprises at least one first symbol sequence, which is generated by the network device according to one or more root sequences; and before sending the second message, the method comprises generating one or more symbol sequences corresponding to the first signal according to the at least one first symbol sequence.

[0249] In an embodiment, the configuration information comprises an index of one or more root sequences; and / or, the configuration information comprises an average transmission power of one or more symbol sequences corresponding to the first signal.

[0250] In an embodiment, the configuration information further comprises first indication information, which is used to indicate a frequency domain resource mapping manner of the first signal corresponding to the preamble.

[0251] In an embodiment, the first indication information is used to indicate at least one of the following information: a symbol sequence of the first signal is located on the left side of the preamble, a symbol sequence of the first signal is located on the right side of the preamble, part of the symbol sequence of the first signal is located on the left side of the preamble and part of the symbol sequence of the first signal is located on the right side of the preamble, or a symbol sequence of the first signal is arranged in a comb shape with a symbol sequence of the preamble.

[0252] In an embodiment, the first indication information comprises at least one of the following information: a subcarrier length of a second symbol sequence, a subcarrier length of a first interval on both sides of the second symbol sequence, a number of resource blocks occupied by the second symbol sequence and the first interval; wherein the second symbol sequence is a symbol sequence on the left side of the preamble; or a subcarrier length of a third symbol sequence, a subcarrier length of a second interval on both sides of the third symbol sequence, a number of resource blocks occupied by the third symbol sequence and the second interval; wherein the third symbol sequence is a symbol sequence on the right side of the preamble; or a subcarrier length of a third interval, a number of resource blocks occupied by the first signal and the preamble, wherein the third interval is a guard interval of the symbol sequence of the first signal and the preamble arranged in a comb shape.

[0253] In an embodiment, if the number of retransmissions of the preamble is greater than or equal to a first threshold, the interface module 801 is further configured to send the preamble and a second signal to the network device; wherein the second signal is generated according to the preamble or a root sequence, an average transmission power of the second signal is less than or equal to an average transmission power of the preamble; the average transmission power of the second signal is greater than or equal to an average transmission power of the first signal, and / or a subcarrier length corresponding to the second signal is greater than or equal to a subcarrier length corresponding to the first signal.

[0254] In an embodiment, the interface module 801 is further configured to receive first configuration information from the network device, the first configuration information indicating a maximum value of an average transmission power corresponding to the second signal, a frequency domain resource of the second signal, and / or a maximum value of a subcarrier length corresponding to the second signal; and the processing module 802 is further configured to determine the second signal according to the second configuration information.

[0255] In addition, the communication apparatus 800 can be configured to implement the functions of the network device in the above embodiments. The communication apparatus 800 is, for example, the network device described in the various embodiments of FIG. 5, and can be, for example, a RAN node such as a base station.

[0256] The interface module 801 can be configured to send a first message to the terminal, the first message indicating a preamble and configuration information of a first signal.

[0257] The interface module 801 is further configured to receive a second message from the terminal, the second message including a preamble and the first signal, wherein the first signal is generated according to the preamble or a root sequence, and an average transmission power of the first signal is less than or equal to an average transmission power of the preamble.

[0258] In an embodiment, the configuration information includes at least one of the following: a subcarrier length corresponding to the first signal, a ratio of the subcarrier length corresponding to the first signal to the subcarrier length corresponding to the preamble, an index number of the subcarrier length corresponding to the first signal, indication information of a first frequency domain resource corresponding to the first signal, a maximum value of an average transmission power corresponding to the first signal, a maximum value of a difference or a ratio of the average transmission power of the preamble to the average transmission power of the first signal, a maximum value of an average transmission power corresponding to a part of symbol sequences of the first signal transmitted through a second frequency domain resource, or a maximum value of a difference or a ratio of the preamble to the average transmission power corresponding to the part of symbol sequences of the first signal transmitted through the second frequency domain resource.

[0259] In an embodiment, the maximum value of the average transmission power corresponding to the first signal includes a first threshold value and a second threshold value, an average transmission power of a first subcarrier in the first signal is less than or equal to the first threshold value, and an average transmission power of a second subcarrier in the first signal is less than or equal to the second threshold value.

[0260] In an embodiment, the subcarrier length corresponding to the first signal is associated with at least one of the following: a subcarrier length of the preamble, a generation format of the preamble, a root sequence corresponding to the preamble, a subcarrier spacing of a physical random access channel, a frequency band of the physical random access channel, or a frequency domain resource mapping manner of the first signal and the preamble.

[0261] In an embodiment, the configuration information indicates one or more root sequences used to generate the symbol sequence of the preamble and / or the first signal.

[0262] In an embodiment, the configuration information comprises at least one first symbol sequence generated by the network device according to one or more root sequences; the at least one first symbol sequence is used to generate the symbol sequence of the first signal.

[0263] In an embodiment, the configuration information comprises an index of one or more root sequences; and / or, the configuration information comprises an average transmission power of one or more symbol sequences corresponding to the first signal.

[0264] In an embodiment, the configuration information further comprises first indication information used to indicate a frequency domain resource mapping manner of the first signal corresponding to the preamble.

[0265] In an embodiment, the first indication information is used to indicate at least one of the following information: the symbol sequence of the first signal is located on the left side of the preamble, the symbol sequence of the first signal is located on the right side of the preamble, part of the symbol sequence of the first signal is located on the left side of the preamble and part of the symbol sequence of the first signal is located on the right side of the preamble, or the symbol sequence of the first signal and the symbol sequence of the preamble are arranged in a comb shape.

[0266] In an embodiment, the first indication information comprises at least one of the following information: a subcarrier length of a second symbol sequence, a subcarrier length of a first interval on both sides of the second symbol sequence, a number of resource blocks occupied by the second symbol sequence and the first interval; wherein the second symbol sequence is a symbol sequence on the left side of the preamble; or a subcarrier length of a third symbol sequence, a subcarrier length of a second interval on both sides of the third symbol sequence, a number of resource blocks occupied by the third symbol sequence and the second interval; wherein the third symbol sequence is a symbol sequence on the right side of the preamble; or a subcarrier length of a third interval, a number of resource blocks occupied by the first signal and the preamble, wherein the third interval is a guard interval of the symbol sequence of the first signal and the preamble arranged in a comb shape.

[0267] In an embodiment, the interface module 801 is further configured to send first configuration information to the terminal, the first configuration information indicating a maximum value of an average transmission power corresponding to the second signal, frequency domain resources of the second signal, and / or a maximum value of a subcarrier length corresponding to the second signal; wherein the second signal is generated according to the preamble or root sequence, the average transmission power of the second signal being less than or equal to the average transmission power of the preamble; the average transmission power of the second signal being greater than or equal to the average transmission power of the first signal, and / or the subcarrier length corresponding to the second signal being greater than or equal to the subcarrier length corresponding to the first signal.

[0268] In summary, when the communication apparatus 800 is configured to implement the functions performed by the terminal or the network device in the above embodiments, other functions that can be implemented by the communication apparatus 800 can refer to the descriptions of the above embodiments.

[0269] In a simple embodiment, the communication apparatus 800 can be in the form shown in FIG. 4, which can be conceived by those skilled in the art. For example, the processor 401 in FIG. 4 can execute the above method embodiments by invoking the computer-executable instructions stored in the memory 403.

[0270] For example, the functions / implementation processes of the processing module 802 in FIG. 8 can be implemented by the processor 401 in FIG. 4.

[0271] For example, the functions / implementation processes of the interface module 801 in FIG. 8 can be implemented by the communication interface 404 in FIG. 4.

[0272] It can be understood that one or more of the above modules or units can be implemented in software, hardware or a combination of both. When any of the above modules or units is implemented in software, the software exists in the form of computer program instructions and is stored in the memory, and the processor can be configured to execute the program instructions and implement the above method flow. The processor can be built in the SoC (System on Chip) or ASIC, or be a separate semiconductor chip. The processor further includes a core for executing software instructions to perform operations or processing, and can further include necessary hardware accelerators, such as field programmable gate array (FPGA), programmable logic device (PLD), or logic circuits for implementing special logic operations.

[0273] When the above modules or units are implemented in hardware, the hardware can be any one or any combination of CPUs, microprocessors, digital signal processing (DSP) chips, microcontroller units (MCUs), artificial intelligence processors, ASICs, SoCs, FPGAs, PLDs, special purpose digital circuits, hardware accelerators, or non-integrated discrete devices, which can run necessary software or be independent of software to perform the above method procedures.

[0274] Optionally, the present application also provides a chip system, comprising: at least one processor and an interface, the at least one processor is coupled with a memory through the interface, when the at least one processor executes a computer program or instructions in the memory, the method in any of the above method embodiments is executed. In a possible implementation, the chip system further comprises the memory. Optionally, the chip system can be composed of a chip, or can comprise a chip and other discrete devices, which are not limited in the present application.

[0275] Optionally, the present application also provides a computer readable storage medium. All or part of the procedures in the above method embodiments can be completed by a computer program instructing related hardware, the program can be stored in the above computer readable storage medium, and the program can include the procedures of the above method embodiments when executed. The computer readable storage medium can be an internal storage unit of the communication device, such as a hard disk or a memory of the communication device. The computer readable storage medium can also be an external storage device of the communication device, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the computer readable storage medium can include both the internal storage unit and the external storage device of the communication device. The computer readable storage medium is used to store the computer program and other programs and data required by the communication device. The computer readable storage medium can also be used to temporarily store data that has been output or will be output.

[0276] Optionally, the present application also provides a computer program product. All or part of the procedures in the above method embodiments can be completed by a computer program instructing related hardware, the program can be stored in the above computer program product, and the program can include the procedures of the above method embodiments when executed.

[0277] Optionally, the present application also provides a computer instruction. All or part of the processes in the method embodiments can be instructed by the computer instruction to complete the related hardware (such as a computer, a processor, a network device or a terminal device, etc.). The program can be stored in the computer readable storage medium or the computer program product.

[0278] Optionally, the present application also provides a communication system, comprising the terminal and the network device in the above embodiments.

[0279] Through the above description of the implementation, those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional module is exemplified, and in actual application, the above-mentioned functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0280] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the modules or units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another device, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed each other can be through some interface, indirect coupling or communication connection between the devices or units, which can be electrical, mechanical or other forms.

[0281] The units described as separate components can or can not be physically separated, and the components shown as units can be one physical unit or multiple physical units, that is, can be located in one place, or can be distributed to multiple different places. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0282] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The above integrated unit can be realized in the form of hardware or in the form of software functional unit.

[0283] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A communication method characterized by comprising: The method comprises: receiving a first message from a network device, the first message indicating preamble and configuration information of a first signal; sending a second message to the network device according to the configuration information, the second message comprising preamble and the first signal, wherein the first signal is generated according to the preamble or root sequence, and the average transmission power of the first signal is less than or equal to the average transmission power of the preamble.

2. The method of claim 1, wherein, The configuration information is used to indicate at least one of the following information: The subcarrier length corresponding to the first signal, the ratio of the subcarrier length corresponding to the first signal to the subcarrier length corresponding to the preamble, the index number of the subcarrier length corresponding to the first signal, the indication information of the first frequency domain resource corresponding to the first signal, the maximum value of the average transmission power corresponding to the first signal, the maximum value of the difference or ratio of the average transmission power of the preamble and the first signal, the maximum value of the average transmission power corresponding to the part of symbol sequence of the first signal sent through the second frequency domain resource, or the maximum value of the difference or ratio of the average transmission power of the preamble and the part of symbol sequence of the first signal sent through the second frequency domain resource.

3. The method of claim 2, wherein, The maximum value of the average transmission power corresponding to the first signal comprises a first threshold value and a second threshold value, the average transmission power of the first subcarrier in the first signal is less than or equal to the first threshold value, and the average transmission power of the second subcarrier in the first signal is less than or equal to the second threshold value.

4. The method according to claim 2 or 3, characterized in that, The subcarrier length corresponding to the first signal is associated with at least one of the following information: The subcarrier length of the preamble, the generation format of the preamble, the root sequence corresponding to the preamble, the subcarrier spacing of the physical random access channel, the frequency band of the physical random access channel, or the frequency domain resource mapping mode corresponding to the first signal and the preamble.

5. The method according to any one of claims 1 to 4, characterized in that, The time domain resource corresponding to the sending of the preamble and the sending of the first signal is the same, and the frequency domain resource corresponding to the sending of the preamble and the sending of the first signal is different.

6. The method according to any one of claims 1 to 5, characterized in that, The configuration information indicates one or more root sequences; Before the second message is sent, the method further comprises: generating a symbol sequence of the preamble according to the one or more root sequences and the cyclic shift length.

7. The method of claim 6, wherein, Before the second message is sent, the method further comprises: generating one or more symbol sequences included in the first signal according to the symbol sequence of the preamble.

8. The method of claim 7, wherein, The configuration information comprises at least one first symbol sequence, and the first symbol sequence is generated by the network device according to one or more root sequences; Before the second message is sent, the method comprises: generating one or more symbol sequences corresponding to the first signal according to the at least one first symbol sequence.

9. The method according to any one of claims 1 to 8, characterized in that, The configuration information comprises the index of one or more root sequences; and / or, the configuration information comprises the average transmission power of one or more symbol sequences corresponding to the first signal.

10. The method according to any one of claims 1 to 9, characterized in that, The configuration information further comprises first indication information, which is used to indicate the frequency domain resource mapping mode corresponding to the first signal and the preamble.

11. The method of claim 10, wherein, The first indication information is used to indicate at least one of the following information: The symbol sequence of the first signal is located on the left side of the preamble, the symbol sequence of the first signal is located on the right side of the preamble, part of the symbol sequence of the first signal is located on the left side of the preamble and part of the symbol sequence of the first signal is located on the right side of the preamble, or the symbol sequence of the first signal is arranged in a comb shape with the symbol sequence of the preamble.

12. The method according to claim 10 or 11, characterized in that, The first indication information includes at least one of the following information: The subcarrier length of the second symbol sequence, the subcarrier length of the first interval on both sides of the second symbol sequence, and the number of resource blocks occupied by the second symbol sequence and the first interval; wherein the second symbol sequence is a symbol sequence on the left side of the preamble; or, The subcarrier length of the third symbol sequence, the subcarrier length of the second interval on both sides of the third symbol sequence, and the number of resource blocks occupied by the third symbol sequence and the second interval; wherein the third symbol sequence is a symbol sequence on the right side of the preamble; or, The subcarrier length of the third interval, and the number of resource blocks occupied by the first signal and the preamble, wherein the third interval is a guard interval of the symbol sequence of the first signal and the preamble arranged in a comb shape.

13. The method according to any one of claims 1 to 12, characterized in that, The method further includes: If the number of retransmissions of the preamble is greater than or equal to a first threshold, sending the preamble and a second signal to the network device; wherein the second signal is generated according to the preamble or a root sequence, and the average transmission power of the second signal is less than or equal to the average transmission power of the preamble; The average transmission power of the second signal is greater than or equal to the average transmission power of the first signal, and / or the subcarrier length corresponding to the second signal is greater than or equal to the subcarrier length corresponding to the first signal.

14. The method of claim 13, wherein, The method further includes: Receiving first configuration information from the network device, the first configuration information indicating the maximum value of the average transmission power corresponding to the second signal, the frequency domain resource of the second signal, and / or the maximum value of the subcarrier length corresponding to the second signal; Determining the second signal according to the first configuration information.

15. A method of communication, comprising: The method includes: Sending a first message to a terminal, the first message indicating the configuration information of a preamble and a first signal; Receiving a second message from the terminal, the second message including a preamble and the first signal, wherein the first signal is generated according to the preamble or a root sequence, and the average transmission power of the first signal is less than or equal to the average transmission power of the preamble.

16. The method of claim 15, wherein, The configuration information is used to indicate at least one of the following information: a maximum value of a ratio of a subcarrier length corresponding to the first signal to a subcarrier length corresponding to the preamble, a maximum value of an index number of the subcarrier length corresponding to the first signal, indication information of a first frequency domain resource corresponding to the first signal, a maximum value of an average transmission power corresponding to the first signal, a maximum value of a difference or a ratio of the average transmission power of the preamble and the first signal, a maximum value of an average transmission power corresponding to a partial symbol sequence of the first signal transmitted through the second frequency domain resource, or a maximum value of a difference or a ratio of the average transmission power of the preamble and the partial symbol sequence of the first signal transmitted through the second frequency domain resource.

17. The method of claim 16, wherein, The maximum value of the average transmission power corresponding to the first signal includes a first threshold value and a second threshold value, an average transmission power of a first subcarrier in the first signal is less than or equal to the first threshold value, and an average transmission power of a second subcarrier in the first signal is less than or equal to the second threshold value.

18. The method of claim 16 or 17, wherein, The subcarrier length corresponding to the first signal is associated with at least one of the following information: a subcarrier length of the preamble, a generation format of the preamble, a root sequence corresponding to the preamble, a subcarrier spacing of a physical random access channel, a frequency band of the physical random access channel, or a frequency domain resource mapping manner corresponding to the first signal and the preamble.

19. The method according to any one of claims 15-18, characterized by, The configuration information indicates one or more root sequences, and the one or more root sequences are used to generate a symbol sequence of the preamble and / or the first signal.

20. The method of claim 19, wherein, The configuration information includes at least one first symbol sequence, and the first symbol sequence is generated by a network device according to one or more root sequences; and the at least one first symbol sequence is used to generate a symbol sequence of the first signal.

21. The method according to any one of claims 15-20, characterized in that, The configuration information includes an index of one or more root sequences; and / or, the configuration information includes an average transmission power of one or more symbol sequences corresponding to the first signal.

22. The method according to any one of claims 15-21, characterized in that, The configuration information further includes first indication information used to indicate a frequency domain resource mapping manner corresponding to the first signal and the preamble.

23. The method of claim 22, wherein, The first indication information is used to indicate at least one of the following information: the symbol sequence of the first signal is located on the left side of the preamble, the symbol sequence of the first signal is located on the right side of the preamble, part of the symbol sequence of the first signal is located on the left side of the preamble and part of the symbol sequence of the first signal is located on the right side of the preamble, or the symbol sequence of the first signal and the symbol sequence of the preamble are arranged in a comb shape.

24. The method of claim 22 or 23, wherein, The first indication information includes at least one of the following information: a subcarrier length of a second symbol sequence, a subcarrier length of a first interval on both sides of the second symbol sequence, and a number of resource blocks occupied by the second symbol sequence and the first interval; wherein the second symbol sequence is a symbol sequence on the left side of the preamble; or a subcarrier length of a third symbol sequence, a subcarrier length of a second interval on both sides of the third symbol sequence, and a number of resource blocks occupied by the third symbol sequence and the second interval; wherein the third symbol sequence is a symbol sequence on the right side of the preamble; or A subcarrier length of a third interval, a number of resource blocks occupied by the first signal and the preamble, wherein the third interval is a guard interval of a symbol sequence of the first signal and the preamble arranged in a comb shape.

25. The method according to any one of claims 15-24, characterized by, The method further includes: sending first configuration information to the terminal, the first configuration information indicating a maximum value of an average transmission power corresponding to the second signal, frequency domain resources of the second signal, and / or a maximum value of a subcarrier length corresponding to the second signal; wherein the second signal is generated according to the preamble or root sequence, and the average transmission power of the second signal is less than or equal to the average transmission power of the preamble; the average transmission power of the second signal is greater than or equal to the average transmission power of the first signal, and / or the subcarrier length corresponding to the second signal is greater than or equal to the subcarrier length corresponding to the first signal.

26. A communications device, characterized by The communication device is configured to implement the method according to any one of claims 1-25.

27. A communications device, characterized by comprising: a processor coupled to a memory, the memory for storing a program or instructions that, when executed by the processor, cause the method according to any one of claims 1-25 to be performed.

28. A computer readable storage medium having stored thereon a computer program or instructions, characterized in that, The computer program or instructions, when executed, cause the method according to any one of claims 1-25 to be performed.

29. A computer program product, comprising computer program code in said computer program product, characterised in that, The computer program code, when executed on a computer, causes the method according to any one of claims 1-25 to be performed.

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