Communication method, apparatus and system

Abstract

The present application provides a communication method, an apparatus and a system, which can be suitable for NTN scenarios. By designing a new resource, for example, designing a short CP PRACH format in an NTN scenario, the method uses conserved CP resources and GP resources as access resources, such that access resources are increased and resource waste is avoided, thereby improving the access capacity, and further improving the communication reliability.

Description

Communication method, device and system

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on December 11, 2023, with application number 202311697220.X, and priority to the Chinese patent application with the invention name “Communication Methods, Devices and Systems”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communications, and in particular to a communication method, device, and system. Background Art

[0003] In non-terrestrial network (NTN) scenarios, upon initial access, a terminal device uses its own geographic location and satellite ephemeris to calculate the timing advance (TA) and send a physical random access channel (PRACH). Global navigation satellite systems (GNSS) offer accuracy ranging from meters to centimeters, so TA calculations are considered relatively accurate.

[0004] Satellites offer wide coverage, with beams extending over tens or even hundreds of kilometers. This creates a huge number of potential users within their coverage area, creating a high demand for access and requiring more resources. However, the current PRACH cyclic prefix and guard interval are significantly redundant, resulting in a certain amount of resource waste. Summary of the Invention

[0005] The present application provides a communication method, device and system that can increase access resources and avoid resource waste.

[0006] In the first aspect, a communication method is provided, which can be executed by a terminal device, or by a chip or circuit used for the terminal device, or by a logic module or software that can realize all or part of the functions of the terminal device. This application does not limit this.

[0007] The method includes: acquiring a first resource, where the first resource belongs to a first type of resource, the first type of resource and the second type of resource belong to the same first resource unit, the first type of resource is used to transmit a first format physical random access channel, and the second type of resource is used to transmit a second format physical random access channel, where the physical random access channel includes a cyclic prefix and an N-times repeated sequence, or the physical random access channel includes the cyclic prefix, the N-times repeated sequence, and a guard interval, where N is greater than or equal to 1, the first type of resource and the second type of resource have different lengths, the number of third resource units occupied by the length of the cyclic prefix is ​​less than M, or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval is less than M, where M is the number of second resource units included in the first resource unit, each of the first resource unit includes at least one of the second resource units, and each of the second resource unit includes at least one of the third resource units, sending the first format physical random access channel through the first resource, or acquiring a second resource, sending the second format physical random access channel through the second resource, and the second resource belongs to the second type of resource.

[0008] In this method, through new resource design, for example, in the NTN scenario, a PRACH format with a shorter cyclic prefix is ​​designed, and the saved resources are used for access resources, thereby increasing access resources and avoiding resource waste, thereby improving access capacity and further improving communication reliability.

[0009] In some implementations, the number of repetitions of the sequence of the first-format physical random access channel is different from the number of repetitions of the sequence of the second-format physical random access channel.

[0010] In some implementations, the number of the third resource units included in each resource of the second type of resources is related to at least one of the number of the second type of resources, the number of the second resource units included in each first resource unit, the number of third resource units included in each second resource unit, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix, or the sum of the number of the third resource units occupied by the cyclic prefix and the guard interval.

[0011] In some implementations, the number of symbols occupied by each resource in the second type of resources satisfies the following relationship: Q=(LN-K(PS)-M) / S.

[0012] Among them, Q is the number of third resource units occupied by each resource in the second type of resources, L is the number of third resource units included in the second resource unit, N is the number of second resource units included in the first resource unit, K is the number of repetitions of the sequence of the physical random access channel, P is the number of random access opportunities included in the first resource unit (that is, the sum of the number of first type resources and second type resources), M is the number of third resource units occupied by the cyclic prefix or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval, and S is the number of second type resources.

[0013] In some implementations, the resource unit includes two time slots, the number of symbols occupied by each resource of the first type of resources is 2, the number of symbols occupied by each resource of the second type of resources is 3, the number of repetitions of the sequence of the first format physical random access channel is 2, the number of repetitions of the sequence of the second format physical random access channel is 3, and the resource unit includes 13 first type resources and 1 second type resource.

[0014] In some implementations, the resource unit includes two time slots, the number of symbols occupied by each resource of the first type of resources is 6, the number of symbols occupied by each resource of the second type of resources is 11, the number of repetitions of the sequence of the first format physical random access channel is 6, the number of repetitions of the sequence of the second format physical random access channel is 11, and the resource unit includes 3 first type resources and 1 second type resource.

[0015] In certain implementations, first indication information is received, where the first indication information indicates a first resource pattern, where the first resource pattern belongs to at least one resource pattern, where the first resource pattern includes first-type resources and second-type resources, where the first-type resources and the second-type resources belong to the same first resource unit, where the first-type resources are used to transmit a first-format physical random access channel, where the second-type resources are used to transmit a second-format physical random access channel, where the physical random access channel includes a cyclic prefix and an N-times repeated sequence, or a cyclic prefix, an N-times repeated sequence and a guard interval, where N is greater than or equal to 1, where the lengths of the first-type resources and the second-type resources are different, where the number of third resource units occupied by the length of the cyclic prefix, or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval is less than M, where M is the number of second resource units contained in the first resource unit, where each of the first resource units includes at least one of the second resource units, and where each of the second resource units includes at least one of the third resource units.

[0016] That is, the network device indicates to the terminal device that this random access uses resources with a shorter cyclic prefix.

[0017] In some implementations, second indication information is received, the second indication information indicates a first index, the first index corresponds to a first parameter, the first parameter includes at least one of the following: the number of the third resource units included in each resource of the second type of resources, the number of the second type of resources, the number of the first type of resources, the number of the second resource units included in each first resource unit, the number of third resource units included in each second resource unit, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the guard interval, the cyclic prefix length of each physical random access channel or the guard interval length of each physical random access channel, the first parameter belongs to at least one parameter, the at least one parameter corresponds one-to-one to at least one index, and the first index belongs to the at least one index.

[0018] In this method, indicating the configuration index in the broadcast signal can reduce the indication overhead.

[0019] In some implementations, third indication information is received, wherein the third indication information indicates a second parameter, and the second parameter includes at least one of the following: the number of the third resource units included in each resource of the second type of resources, the number of the second type of resources, the number of the first type of resources, the number of the second resource units included in each of the first resource units, the number of third resource units included in each of the second resource units, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the guard interval, the cyclic prefix length of each physical random access channel, or the guard interval length of each physical random access channel.

[0020] That is, the network device directly indicates relevant parameters to the terminal device.

[0021] In some implementations, the second indication information and / or the third indication information is carried in a broadcast signal.

[0022] In some implementations, a third parameter is received, where the third parameter is used to determine a preset condition; and whether to send the physical random access channel in the first format or the physical random access channel in the second format is determined based on the preset condition.

[0023] In some implementations, the third parameter indicates a coverage range of a beam used for communication between the network device and the terminal device.

[0024] In some implementations, the third parameter indicates the center position and beam radius of the beam, and the preset condition is: when the ratio of the distance between the terminal device and the center position of the beam to the beam radius is greater than or equal to a first threshold, the physical random access channel of the second format is sent through the second resource; when the ratio of the distance between the terminal device and the center position of the beam to the beam radius is less than the first threshold, the physical random access channel of the first format is sent through the first resource.

[0025] In some implementations, the third parameter includes a beam center position and a reference point position, and the preset condition is:

[0026] When the distance between the terminal device and the beam center position is greater than or equal to the distance between the beam center position and the reference point position, the physical random access channel of the second format is sent through the second resource; when the distance between the terminal device and the beam center position is less than the distance between the beam center position and the reference point position, the physical random access channel of the first format is sent through the first resource.

[0027] In the above method, when the terminal device is located in a position closer to the beam center within the beam coverage range, ordinary resources can be used to send the first format random access channel with fewer repetitions, which can save overhead; when the terminal device is located in a position farther away from the beam center within the beam coverage, enhanced resources can be used to send the second format random access channel with more repetitions, which can improve the success rate of random access channel transmission and further improve the probability of successful access.

[0028] In some implementations, the third parameter is a power threshold, and the preset condition is: when the signal received by the terminal device has a power greater than or equal to the power threshold, a physical random access channel in the first format is sent through the first resource; when the signal received by the terminal device has a power less than the power threshold, a physical random access channel in the second format is sent through the second resource.

[0029] In this method, the format of the physical random access channel to be sent is determined based on the terminal device's own received signal power. When the terminal device's received signal power meets the threshold, power consumption can be saved. When the terminal device's received signal power does not meet the threshold, enhanced resources are used to send a physical random access channel with a greater number of repetitions, which can improve the success rate of random access channel transmission and further increase the probability of successful access.

[0030] On the second aspect, a communication method is provided, which can be executed by a network device, or by a chip or circuit used for a network device, or by a logic module or software that can realize all or part of the functions of the network device. This application does not limit this.

[0031] The method includes: receiving a first-format physical random access channel through a first resource, or receiving a second-format physical random access channel through a second resource, wherein the first resource belongs to a first-type resource, the first-type resource and the second-type resource belong to the same first resource unit, the first-type resource is used to transmit the first-format physical random access channel, and the second-type resource is used to transmit the second-format physical random access channel, the physical random access channel includes a cyclic prefix and an N-times repeated sequence, or a cyclic prefix, an N-times repeated sequence and a guard interval, N is greater than or equal to 1, the first-type resource and the second-type resource have different lengths, the number of third resource units occupied by the length of the cyclic prefix, or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval is less than M, M is the number of second resource units contained in the first resource unit, each of the first resource units includes at least one of the second resource units, and each of the second resource units includes at least one of the third resource units.

[0032] In some implementations, the number of repetitions of the sequence of the first-format physical random access channel is different from the number of repetitions of the sequence of the second-format physical random access channel.

[0033] In some implementations, the number of the third resource units included in each resource of the second type of resources is related to at least one of the number of the second type of resources, the number of the second resource units included in each first resource unit, the number of third resource units included in each second resource unit, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix, or the sum of the number of the third resource units occupied by the cyclic prefix and the guard interval.

[0034] In some implementations, the number of symbols occupied by each resource in the second type of resources satisfies the following relationship: Q=(LN-K(PS)-M) / S.

[0035] Among them, Q is the number of third resource units occupied by each resource in the second type of resources, L is the number of third resource units included in the second resource unit, N is the number of second resource units included in the first resource unit, K is the number of repetitions of the sequence of the physical random access channel, P is the number of random access opportunities included in the first resource unit (that is, the sum of the number of first type resources and second type resources), M is the number of third resource units occupied by the cyclic prefix or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval, and S is the number of second type resources.

[0036] In some implementations, the resource unit includes two time slots, the number of symbols occupied by each resource of the first type of resources is 2, the number of symbols occupied by each resource of the second type of resources is 3, the number of repetitions of the sequence of the first format physical random access channel is 2, the number of repetitions of the sequence of the second format physical random access channel is 3, and the resource unit includes 13 first type resources and 1 second type resource.

[0037] In some implementations, the resource unit includes two time slots, the number of symbols occupied by each resource of the first type of resources is 6, the number of symbols occupied by each resource of the second type of resources is 11, the number of repetitions of the sequence of the first format physical random access channel is 6, the number of repetitions of the sequence of the second format physical random access channel is 11, and the resource unit includes 3 first type resources and 1 second type resource.

[0038] In some implementations, first indication information is sent, where the first indication information indicates a first resource mode, where the first resource mode belongs to at least one resource mode, where the first resource mode includes first type resources and second type resources, where the first type resources and the second type resources belong to the same first resource unit, where the first type resources are used to transmit a first format physical random access channel, where the second type resources are used to transmit a second format physical random access channel, where the physical random access channel includes a cyclic prefix and an N-times repeated sequence, or a cyclic prefix, an N-times repeated sequence and a guard interval, where N is greater than or equal to 1, where the lengths of the first type resources and the second type resources are different, where the number of third resource units occupied by the length of the cyclic prefix, or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval is less than M, where M is the number of second resource units contained in the first resource unit, where each of the first resource units includes at least one of the second resource units, and where each of the second resource units includes at least one of the third resource units.

[0039] In some implementations, second indication information is sent, the second indication information indicates a first index, the first index corresponds to a first parameter, the first parameter includes at least one of the following: the number of the third resource units included in each resource of the second type of resources, the number of the second type of resources, the number of the first type of resources, the number of the second resource units included in each first resource unit, the number of third resource units included in each second resource unit, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the guard interval, the cyclic prefix length of each physical random access channel or the guard interval length of each physical random access channel, the first parameter belongs to at least one parameter, the at least one parameter corresponds one-to-one to at least one index, and the first index belongs to the at least one index.

[0040] In some implementations, third indication information is sent, wherein the third indication information indicates a second parameter, and the second parameter includes at least one of the following: the number of the third resource units included in each resource of the second type of resources, the number of the second type of resources, the number of the first type of resources, the number of the second resource units included in each of the first resource units, the number of third resource units included in each of the second resource units, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the guard interval, the cyclic prefix length of each physical random access channel, or the guard interval length of each physical random access channel.

[0041] In some implementations, the second indication information and / or the third indication information is carried in a broadcast signal.

[0042] In some implementations, a third parameter is sent, where the third parameter is used to determine a preset condition; and whether to send the physical random access channel in the first format or the physical random access channel in the second format is determined based on the preset condition.

[0043] In some implementations, the third parameter indicates a coverage range of a beam used for communication between the network device and the terminal device.

[0044] In some implementations, the third parameter indicates the center position and beam radius of the beam, and the preset condition is: when the ratio of the distance between the terminal device and the center position of the beam to the beam radius is greater than or equal to a first threshold, the physical random access channel of the second format is sent through the second resource; when the ratio of the distance between the terminal device and the center position of the beam to the beam radius is less than the first threshold, the physical random access channel of the first format is sent through the first resource.

[0045] In some implementations, the third parameter includes a beam center position and a reference point position, and the preset condition is: when the distance between the terminal device and the beam center position is greater than or equal to the distance between the beam center position and the reference point position, the physical random access channel of the second format is sent through the second resource; when the distance between the terminal device and the beam center position is less than the distance between the beam center position and the reference point position, the physical random access channel of the first format is sent through the first resource.

[0046] In some implementations, the third parameter is a power threshold, and the preset condition is: when the signal received by the terminal device has a power greater than or equal to the power threshold, a physical random access channel in the first format is sent through the first resource; when the signal received by the terminal device has a power less than the power threshold, a physical random access channel in the second format is sent through the second resource.

[0047] It should be understood that the second aspect is an implementation method on the network device side corresponding to the first aspect. The explanations, supplements and descriptions of the beneficial effects of the first aspect are also applicable to the second aspect and will not be repeated here.

[0048] According to a third aspect, a communication device is provided, including a transceiver unit and a processing unit, wherein the processing unit obtains a first resource, the first resource belongs to a first type of resource, the first type of resource and the second type of resource belong to the same first resource unit, the first type of resource is used to transmit a first format physical random access channel, and the second type of resource is used to transmit a second format physical random access channel, the physical random access channel includes a cyclic prefix and an N-times repeated sequence, or the physical random access channel includes the cyclic prefix, the N-times repeated sequence and a guard interval, N is greater than or equal to 1, the first type of resource and the second type of resource have different lengths, the number of third resource units occupied by the length of the cyclic prefix is ​​less than M, or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval is less than M, where M is the number of second resource units included in the first resource unit, each first resource unit includes at least one second resource unit, and each second resource unit includes at least one third resource unit, the transceiver unit is used to send the first format physical random access channel through the first resource, or the processing unit is used to obtain a second resource, the transceiver unit is used to send the second format physical random access channel through the second resource, and the second resource belongs to the second type of resource.

[0049] In some implementations, the number of repetitions of the sequence of the first-format physical random access channel is different from the number of repetitions of the sequence of the second-format physical random access channel.

[0050] In some implementations, the number of the third resource units included in each resource of the second type of resources is related to at least one of the number of the second type of resources, the number of the second resource units included in each first resource unit, the number of third resource units included in each second resource unit, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix, or the sum of the number of the third resource units occupied by the cyclic prefix and the guard interval.

[0051] In some implementations, the number of symbols occupied by each resource in the second type of resources satisfies the following relationship: Q=(LN-K(PS)-M) / S.

[0052] Among them, Q is the number of third resource units occupied by each resource in the second type of resources, L is the number of third resource units included in the second resource unit, N is the number of second resource units included in the first resource unit, K is the number of repetitions of the sequence of the physical random access channel, P is the number of random access opportunities included in the first resource unit (that is, the sum of the number of first type resources and second type resources), M is the number of third resource units occupied by the cyclic prefix or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval, and S is the number of second type resources.

[0053] In some implementations, the resource unit includes two time slots, the number of symbols occupied by each resource of the first type of resources is 2, the number of symbols occupied by each resource of the second type of resources is 3, the number of repetitions of the sequence of the first format physical random access channel is 2, the number of repetitions of the sequence of the second format physical random access channel is 3, and the resource unit includes 13 first type resources and 1 second type resource.

[0054] In some implementations, the resource unit includes two time slots, the number of symbols occupied by each resource of the first type of resources is 6, the number of symbols occupied by each resource of the second type of resources is 11, the number of repetitions of the sequence of the first format physical random access channel is 6, the number of repetitions of the sequence of the second format physical random access channel is 11, and the resource unit includes 3 first type resources and 1 second type resource.

[0055] In certain implementations, a transceiver unit is used to receive first indication information, where the first indication information indicates a first resource mode, where the first resource mode belongs to at least one resource mode, where the first resource mode includes first-type resources and second-type resources, where the first-type resources and the second-type resources belong to the same first resource unit, where the first-type resources are used to transmit a first-format physical random access channel, where the second-type resources are used to transmit a second-format physical random access channel, where the physical random access channel includes a cyclic prefix and an N-times repeated sequence, or a cyclic prefix, an N-times repeated sequence and a guard interval, where N is greater than or equal to 1, where the lengths of the first-type resources and the second-type resources are different, where the number of third resource units occupied by the length of the cyclic prefix, or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval is less than M, where M is the number of second resource units contained in the first resource unit, where each of the first resource units includes at least one of the second resource units, and where each of the second resource units includes at least one of the third resource units.

[0056] In certain implementations, the transceiver unit is used to receive second indication information, where the second indication information indicates a first index, where the first index corresponds to a first parameter, and the first parameter includes at least one of the following: the number of the third resource units included in each resource of the second type of resources, the number of the second type of resources, the number of the first type of resources, the number of the second resource units included in each first resource unit, the number of third resource units included in each second resource unit, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the guard interval, the cyclic prefix length of each physical random access channel or the guard interval length of each physical random access channel, the first parameter belongs to at least one parameter, the at least one parameter corresponds one-to-one to at least one index, and the first index belongs to the at least one index.

[0057] In some implementations, the transceiver unit is used to receive third indication information, where the third indication information indicates a second parameter, and the second parameter includes at least one of the following: the number of the third resource units included in each resource of the second type of resources, the number of the second type of resources, the number of the first type of resources, the number of the second resource units included in each of the first resource units, the number of the third resource units included in each of the second resource units, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the guard interval, the cyclic prefix length of each physical random access channel, or the guard interval length of each physical random access channel.

[0058] In some implementations, the second indication information and / or the third indication information is carried in a broadcast signal.

[0059] In some implementations, the transceiver unit is configured to receive a third parameter, where the third parameter is used to determine a preset condition; and determine whether to send the physical random access channel in the first format or the physical random access channel in the second format based on the preset condition.

[0060] In some implementations, the third parameter indicates a coverage range of a beam used for communication between the network device and the terminal device.

[0061] In some implementations, the third parameter indicates the center position and beam radius of the beam, and the preset condition is: when the ratio of the distance between the terminal device and the center position of the beam to the beam radius is greater than or equal to a first threshold, the physical random access channel of the second format is sent through the second resource; when the ratio of the distance between the terminal device and the center position of the beam to the beam radius is less than the first threshold, the physical random access channel of the first format is sent through the first resource.

[0062] In some implementations, the third parameter includes a beam center position and a reference point position, and the preset condition is:

[0063] When the distance between the terminal device and the beam center position is greater than or equal to the distance between the beam center position and the reference point position, the physical random access channel of the second format is sent through the second resource; when the distance between the terminal device and the beam center position is less than the distance between the beam center position and the reference point position, the physical random access channel of the first format is sent through the first resource.

[0064] In some implementations, the third parameter is a power threshold, and the preset condition is: when the signal received by the terminal device has a power greater than or equal to the power threshold, a physical random access channel in the first format is sent through the first resource; when the signal received by the terminal device has a power less than the power threshold, a physical random access channel in the second format is sent through the second resource.

[0065] In a fourth aspect, a communication device is provided, comprising a transceiver unit, which is used to receive a first-format physical random access channel through a first resource, or to receive a second-format physical random access channel through a second resource, wherein the first resource belongs to a first-type resource, the first-type resource and the second-type resource belong to the same first resource unit, the first-type resource is used to transmit the first-format physical random access channel, and the second-type resource is used to transmit the second-format physical random access channel, the physical random access channel includes a cyclic prefix and an N-times repeated sequence, or a cyclic prefix, an N-times repeated sequence and a guard interval, N is greater than or equal to 1, the length of the first-type resource is different from that of the second-type resource, the number of third resource units occupied by the length of the cyclic prefix, or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval is less than M, M is the number of second resource units contained in the first resource unit, each of the first resource unit includes at least one of the second resource unit, and each of the second resource unit includes at least one of the third resource unit.

[0066] In some implementations, the number of repetitions of the sequence of the first-format physical random access channel is different from the number of repetitions of the sequence of the second-format physical random access channel.

[0067] In some implementations, the number of the third resource units included in each resource of the second type of resources is related to at least one of the number of the second type of resources, the number of the second resource units included in each first resource unit, the number of third resource units included in each second resource unit, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix, or the sum of the number of the third resource units occupied by the cyclic prefix and the guard interval.

[0068] In some implementations, the number of symbols occupied by each resource in the second type of resources satisfies the following relationship: Q=(LN-K(PS)-M) / S.

[0069] Among them, Q is the number of third resource units occupied by each resource in the second type of resources, L is the number of third resource units included in the second resource unit, N is the number of second resource units included in the first resource unit, K is the number of repetitions of the sequence of the physical random access channel, P is the number of random access opportunities included in the first resource unit (that is, the sum of the number of first type resources and second type resources), M is the number of third resource units occupied by the cyclic prefix or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval, and S is the number of second type resources.

[0070] In some implementations, the resource unit includes two time slots, the number of symbols occupied by each resource of the first type of resources is 2, the number of symbols occupied by each resource of the second type of resources is 3, the number of repetitions of the sequence of the first format physical random access channel is 2, the number of repetitions of the sequence of the second format physical random access channel is 3, and the resource unit includes 13 first type resources and 1 second type resource.

[0071] In some implementations, the resource unit includes two time slots, the number of symbols occupied by each resource of the first type of resources is 6, the number of symbols occupied by each resource of the second type of resources is 11, the number of repetitions of the sequence of the first format physical random access channel is 6, the number of repetitions of the sequence of the second format physical random access channel is 11, and the resource unit includes 3 first type resources and 1 second type resource.

[0072] In certain implementations, the transceiver unit is used to send first indication information, where the first indication information indicates a first resource mode, the first resource mode belongs to at least one resource mode, the first resource mode includes first type resources and second type resources, the first type resources and the second type resources belong to the same first resource unit, the first type resources are used to transmit a first format physical random access channel, the second type resources are used to transmit a second format physical random access channel, the physical random access channel includes a cyclic prefix and an N-times repeated sequence, or a cyclic prefix, an N-times repeated sequence and a guard interval, N is greater than or equal to 1, the length of the first type resource is different from that of the second type resource, the number of third resource units occupied by the length of the cyclic prefix, or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval is less than M, M is the number of second resource units contained in the first resource unit, each of the first resource units includes at least one of the second resource units, and each of the second resource units includes at least one of the third resource units.

[0073] In certain implementations, the transceiver unit is used to send second indication information, where the second indication information indicates a first index, where the first index corresponds to a first parameter, and the first parameter includes at least one of the following: the number of the third resource units included in each resource of the second type of resources, the number of the second type of resources, the number of the first type of resources, the number of the second resource units included in each first resource unit, the number of third resource units included in each second resource unit, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the guard interval, the cyclic prefix length of each physical random access channel or the guard interval length of each physical random access channel, the first parameter belongs to at least one parameter, the at least one parameter corresponds one-to-one to at least one index, and the first index belongs to the at least one index.

[0074] In some implementations, the transceiver unit is used to send third indication information, where the third indication information indicates a second parameter, and the second parameter includes at least one of the following: the number of the third resource units included in each resource of the second type of resources, the number of the second type of resources, the number of the first type of resources, the number of the second resource units included in each of the first resource units, the number of the third resource units included in each of the second resource units, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the guard interval, the cyclic prefix length of each physical random access channel, or the guard interval length of each physical random access channel.

[0075] In some implementations, the second indication information and / or the third indication information is carried in a broadcast signal.

[0076] In some implementations, the transceiver unit is configured to send a third parameter, where the third parameter is used to determine a preset condition; and determine whether to send the physical random access channel in the first format or the physical random access channel in the second format based on the preset condition.

[0077] In some implementations, the third parameter indicates a coverage range of a beam used for communication between the network device and the terminal device.

[0078] In some implementations, the third parameter indicates the center position and beam radius of the beam, and the preset condition is: when the ratio of the distance between the terminal device and the center position of the beam to the beam radius is greater than or equal to a first threshold, the physical random access channel of the second format is sent through the second resource; when the ratio of the distance between the terminal device and the center position of the beam to the beam radius is less than the first threshold, the physical random access channel of the first format is sent through the first resource.

[0079] In some implementations, the third parameter includes a beam center position and a reference point position, and the preset condition is: when the distance between the terminal device and the beam center position is greater than or equal to the distance between the beam center position and the reference point position, the physical random access channel of the second format is sent through the second resource; when the distance between the terminal device and the beam center position is less than the distance between the beam center position and the reference point position, the physical random access channel of the first format is sent through the first resource.

[0080] In some implementations, the third parameter is a power threshold, and the preset condition is: when the signal received by the terminal device has a power greater than or equal to the power threshold, a physical random access channel in the first format is sent through the first resource; when the signal received by the terminal device has a power less than the power threshold, a physical random access channel in the second format is sent through the second resource.

[0081] It should be understood that the third and fourth aspects are implementations of the device side corresponding to the first and second aspects, and the explanations, supplements and descriptions of the beneficial effects of the first and second aspects are also applicable to the third and fourth aspects and will not be repeated here.

[0082] In a fifth aspect, the present application provides a communication device, comprising an interface circuit and a processor, wherein the interface circuit is used to implement the function of the transceiver module in the third aspect, and the processor is used to implement the function of the processing module in the third aspect.

[0083] In a sixth aspect, the present application provides a communication device, comprising an interface circuit and a processor, wherein the interface circuit is used to implement the function of the transceiver module in the fourth aspect, and the processor is used to implement the function of the processing module in the sixth aspect.

[0084] In the seventh aspect, the present application provides a computer-readable medium storing a program code for execution on a terminal device, the program code comprising instructions for executing the method of the first aspect, or any possible manner in the first aspect, or all possible manners in the first aspect.

[0085] In an eighth aspect, an embodiment of the present application provides a computer-readable medium storing a program code for execution by a network device, the program code including instructions for executing the method of the second aspect, or the third aspect, or any possible manner in the second aspect, or any possible manner in the third aspect, or all possible manners in the second aspect, or all possible manners in the third aspect.

[0086] In the ninth aspect, a computer program product storing computer-readable instructions is provided, which, when the computer-readable instructions are executed on a computer, enables the computer to execute the method of the first aspect, or any possible method of the first aspect, or all possible methods of the first aspect.

[0087] In the tenth aspect, a computer program product storing computer-readable instructions is provided, which, when the computer-readable instructions are run on a computer, enables the computer to execute the method of the above-mentioned second aspect, or any possible method of the second aspect, or all possible methods of the second aspect.

[0088] In the eleventh aspect, a communication system is provided, which includes a device having functions of implementing the above-mentioned first aspect, or any possible manner in the first aspect, or all possible manners in the first aspect, the second aspect, or any possible manner in the second aspect, or all possible manners in the second aspect, and various possible designed functions.

[0089] In the twelfth aspect, a processor is provided, which is coupled to a memory and is used to execute the method of the above-mentioned first aspect, or any possible method of the first aspect, or all possible methods of the first aspect.

[0090] In a thirteenth aspect, a processor is provided, coupled to a memory, for executing the method of the second aspect, or any possible manner of the second aspect, or all possible manners of the second aspect.

[0091] In a fourteenth aspect, a chip system is provided, comprising a processor and a memory configured to execute computer programs or instructions stored in the memory, so that the chip system implements the method of any of the aforementioned first or second aspects, as well as any possible implementation of either aspect. The chip system may be composed of a chip alone, or may include a chip and other discrete components. BRIEF DESCRIPTION OF THE DRAWINGS

[0092] FIG1 is a schematic diagram of a wireless communication system applicable to an embodiment of the present application.

[0093] FIG2 is a schematic diagram of a communication method provided in an embodiment of the present application.

[0094] FIG3 is a schematic diagram of two resource designs provided in an embodiment of the present application.

[0095] FIG4 shows a schematic block diagram of a communication device provided in an embodiment of the present application.

[0096] FIG5 shows a schematic structural diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0097] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0098] Figure 1 is a schematic diagram of the architecture of a communication system 1000 used in an embodiment of the present application. As shown in Figure 1 , the communication system includes a radio access network 100 and a core network 200. Optionally, the communication system 1000 may also include the Internet 300. The radio access network 100 may include at least one radio access network device (such as 110a and 110b in Figure 1 ) and at least one terminal (such as 120a-120j in Figure 1 ). The terminal is wirelessly connected to the radio access network device, and the radio access network device is wirelessly or wiredly connected to the core network. The core network device and the radio access network device may be independent, distinct physical devices, or the core network device's functions and the radio access network device's logical functions may be integrated into the same physical device, or a single physical device may integrate some of the core network device's functions and some of the radio access network device's functions. Terminals and radio access network devices may be interconnected via wired or wireless connections. Figure 1 is merely a schematic diagram. The communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in Figure 1 .

[0099] The network device may be a wireless access network device, such as a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation NodeB (gNB) in a fifth generation (5G) mobile communication system, a next generation base station in a future communication system, a base station in a future mobile communication system, or an access node in a WiFi system; it may also be a module or unit that performs part of the functions of a base station, for example, the wireless access network device may include at least one of a centralized unit (CU), a distributed unit (DU), and a radio unit (RU), wherein the centralized unit may also be referred to as a central unit (CU) or a control unit (CU). Here, the CU completes the functions of the radio resource control (RRC) layer and the packet data convergence protocol (PDCP) layer of the base station, and can also complete the functions of the service data adaptation protocol (SDAP) layer; the DU completes the functions of the radio link control (RLC) layer and the medium access control (MAC) layer of the base station, and can also complete the functions of part of the physical layer (for example, the upper layer of the physical layer) or the entire physical layer; the RU completes the radio frequency function and can also complete the functions of part of the physical layer (for example, the lower layer of the physical layer); for the specific description of each of the above protocol layers, please refer to the relevant technical specifications of the 3rd Generation Partnership Project (3GPP). The wireless access network device can be a macro base station (such as 110a in Figure 1), a micro base station or an indoor station (such as 110b in Figure 1), or a relay node or a donor node. The embodiments of the present application do not limit the specific technology and specific device form adopted by the wireless access network device. For the convenience of description, the following description takes the base station as an example of the network device.

[0100] Terminal devices may also be referred to as terminals, user equipment (UE), mobile stations, mobile terminals, etc. Terminals can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, etc. The terminal can be a mobile phone, tablet computer, computer with wireless transceiver function, wearable device, vehicle, drone, helicopter, airplane, ship, robot, robotic arm, smart home device, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal.

[0101] Base stations and terminals can be fixed or mobile. They can be deployed on land, indoors or outdoors, handheld or vehicle-mounted; on water; or on aircraft, balloons, and satellites. The embodiments of this application do not limit the application scenarios of base stations and terminals.

[0102] The roles of base stations and terminals can be relative. For example, the helicopter or drone 120i in Figure 1 can be configured as a mobile base station. To terminals 120j accessing the wireless access network 100 via 120i, terminal 120i is a base station. However, to base station 110a, 120i is a terminal, meaning that communication between 110a and 120i occurs via a wireless air interface protocol. Of course, communication between 110a and 120i can also occur via a base station-to-base station interface protocol. In this case, 120i is also a base station relative to 110a. Therefore, base stations and terminals can be collectively referred to as communication devices. 110a and 110b in Figure 1 can be referred to as communication devices with base station functionality, while 120a-120j in Figure 1 can be referred to as communication devices with terminal functionality.

[0103] Communication between base stations and terminals, between base stations, and between terminals can be carried out through authorized spectrum, unauthorized spectrum, or both; communication can be carried out through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0104] In the embodiments of the present application, the functions of the base station may also be performed by a module (such as a chip) in the base station, or by a control subsystem that includes the base station functions. The control subsystem that includes the base station functions here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city. The functions of the terminal may also be performed by a module (such as a chip or modem) in the terminal, or by a device that includes the terminal functions.

[0105] The technical solutions provided in the embodiments of this application can be applied to wireless communications between communication devices. Wireless communications between communication devices may include: wireless communications between network devices and terminals, wireless communications between network devices, and wireless communications between terminals. In the embodiments of this application, the term "wireless communications" may also be referred to as "communication," which may also be described as "data transmission," "information transmission," or "transmission."

[0106] It can be understood that in the embodiments of the present application, the physical downlink share channel (PDSCH), the physical downlink control channel (PDCCH) and the physical uplink share channel (PUSCH) are merely examples of downlink data channels, downlink control channels and uplink data channels, respectively. In different systems and different scenarios, data channels and control channels may have different names, and the embodiments of the present application do not limit this.

[0107] In order to facilitate understanding of the solutions of the embodiments of the present application, the concepts involved in the embodiments of the present application are first explained.

[0108] 1. Non-terrestrial network (NTN)

[0109] Satellite communications, for example, offer wide coverage, long communication distances, high reliability, flexibility, and high throughput. Unaffected by geographic conditions, climate, and natural disasters, they are widely used in aviation, maritime, and military communications. Incorporating satellites into the future fifth-generation mobile communications air interface technology will enable communication services in areas difficult to reach by terrestrial networks, such as oceans and forests. This will enhance the reliability of 5G communications, providing more stable and high-quality communication services for users on trains, airplanes, and other modes of transportation. Furthermore, it will provide more data transmission resources and support a greater number of connections.

[0110] 2. Random Access Process

[0111] The random access process refers to the process from the time a user sends a random access preamble to attempt to access the network to the time a basic signaling connection is established with the network. Random access is a very critical step in mobile communication systems, enabling terminal devices to establish a communication connection with network devices. It is applicable to scenarios such as power-on attachment, service requests, and handovers. The terminal device exchanges information with the network device through random access to complete subsequent operations such as calls, resource requests, and data transmission. The terminal device achieves uplink time synchronization with the system through random access. The random access process basically includes the following steps: the terminal device sends a random access preamble (also referred to as a sequence in the embodiment of this application), the network device sends a random access response message, the terminal device sends an RRC connection request, and the terminal device receives an RRC connection establishment (this process is also known as the conflict resolution process). Random access is divided into competitive random access and non-competitive random access. The specific random access method to be selected depends on the network policy. In the contention-based random access method, for the terminal device, PRACH is a resource pool to choose from. Different terminal devices can use the same resources, resulting in resource competition. In the non-contention-based random access method, specific resources are reserved and can be allocated to a terminal device at a certain moment.

[0112] 3. Random Access Opportunity (PRACH occasion, RO)

[0113] A random access opportunity refers to the appropriate time and frequency domain location selected by a terminal device when performing random access in a wireless communication system for uplink communication with a network device. The selection of a random access opportunity has a significant impact on the performance and efficiency of the wireless communication system. During the random access process, the terminal device selects an appropriate RO and transmits a random access preamble on that RO. An RO can be considered a random access resource. A terminal device can transmit a PRACH preamble sequence on a specific RO, i.e., a specific time-frequency resource. In 5G (NR), the random access preamble is repeatedly transmitted on the time-frequency resource. The time-frequency resource occupied by each transmission is called a "PRACH opportunity (RO)." Each RO has different characteristics, such as a different number of available preambles or a different maximum transmit power. If a terminal device selects an inappropriate RO, the network device may not be able to correctly receive the preamble, prolonging the random access process or causing connection failure. Therefore, the terminal device should make an appropriate selection based on the current network conditions and its own capabilities.

[0114] 4. Physical random access channel

[0115] In 5G (NR), PRACH is the access channel when the terminal device first initiates a call. After receiving the random access response message, the terminal device will send an RRC Connection Request message on the PRACH channel according to the information indicated by the network device to establish an RRC connection. The physical random access channel in this application includes a cyclic prefix (CP) and a repeatedly transmitted preamble sequence (referred to as sequence), or includes a cyclic prefix, a repeatedly transmitted preamble sequence and a guard period (GP).

[0116] 5.PRACH format

[0117] The NR standard defines the PRACH format.

[0118] Table 1 lists nine PRACH formats. Each RO format corresponds to a PRACH format. Each RO is aligned with an OFDM symbol boundary. For example, for format Ax, the sequence is repeated S times, and the sum of the cyclic prefix lengths of S OFDM symbols is used as the PRACH CP. Since the Ax format does not have a built-in GP, ​​the OFDM symbols following the sequence in the RO are used as a guard interval. For format Bx, the sequence is repeated Q times, and the CP length of Q OFDM symbols is used as the PRACH CP and GP.

[0119] Table 1 Random access channel format

[0120] Note: seconds, μ=0, 1, 2, 3 correspond to 15, 30, 60, 120kHz subcarriers respectively.

[0121] In a subframe, the starting symbol index l of an RO is given by the following formula

[0122] Among them, l0 represents the starting symbol index, Indicates the RO index in a PRACH time slot, The value of Indicates the number of ROs in a PRACH time slot, Indicates the length of an RO, Indicates the number of PRACH time slots. The values ​​of are defined in Tables 6.3.3.2-2 to 6.3.3.2-4 of the existing NR standard 3GPP TS 38.211. Each PRACH Configuration Index value corresponds to a set of parameter values. Table 2 provides some examples.

[0123] Table 2 3GPP TS 38.211 Table 6.3.3.2-3 Partial parameter examples

[0124] 4. First resource unit, second resource unit and third resource unit

[0125] The first resource unit involved in this application includes at least one second resource unit, and the second resource unit includes at least one third resource unit. Taking the time domain as an example, the first resource unit can be a resource unit consisting of one or more time slots, the second resource unit can be a time slot, and the third resource unit can be an orthogonal frequency-division multiplexing (OFDM) symbol, such as an OFDM symbol that does not include a CP.

[0126] 5. Type 1 resources and Type 2 resources

[0127] The first type of resource and the second type of resource transmit different PRACH formats. For example, the first type of resource can be used to transmit a PRACH in A1 format, and the second type of resource can be used to transmit a PRACH in A2 format. For example, the first type of resource and the second type of resource can be different types of ROs. There can be one or more first type resources, and there can be one or more second type resources.

[0128] In the existing NR standard, the CP length of the PRACH preamble sequence must be greater than the maximum round-trip transmission delay of the terrestrial cell. The maximum round-trip transmission delay is related to the cell radius. The larger the cell radius, the lower the link budget of the cell edge user, the longer the maximum round-trip transmission delay, and the more PRACH preamble sequence repetitions and longer CP are required. In addition, a certain guard interval GP needs to be retained to prevent inter-symbol interference. In the NTN scenario, when the terminal device initially accesses, it calculates the timing advance (TA) based on its own geographic location information and satellite ephemeris and sends PRACH. The industry's global navigation satellite system (GNSS) has an accuracy of up to meters to centimeters, so the TA calculation can be considered relatively accurate.

[0129] Therefore, the existing NR standard has significant redundancy in the CP and GP of the PRACH designed for cellular use, resulting in a certain amount of resource waste. Satellites offer wide coverage, with beam coverage reaching tens or even hundreds of kilometers. This creates a huge number of potential users within their coverage area, creating a high demand for access and, consequently, requiring more access resources. The current redundancy in CP and GP is a waste of these resources.

[0130] In view of this, an embodiment of the present application proposes a communication method that can save resources. As shown in Figure 2, taking a terminal device and a network device as an example of the communicating parties, the method includes the following steps:

[0131] S210, the terminal device obtains the first resource or obtains the second resource.

[0132] The first resource belongs to a first type of resource. For example, the first resource may be an RO. For details, the explanation of RO can refer to the above description.

[0133] The first type of resources and the second type of resources belong to the same first resource unit. In other words, the resources in the first resource unit are divided into two types, namely the first type of resources and the second type of resources.

[0134] Each first resource unit includes at least one second resource unit, and each second resource unit includes at least one third resource unit. For example, the first resource unit includes two time slots (an example of the second resource), and each time slot includes 15 OFDM symbols (an example of the third resource unit).

[0135] The lengths of the first type of resources and the second type of resources are different. For example, the length of the time domain resources occupied by at least one resource of the first type of resources is smaller than the length of the time domain resources occupied by at least one resource of the second type of resources. Taking symbols as an example of time domain resource units, the number of symbols occupied by at least one resource of the first type of resources is smaller than the number of symbols occupied by resources of the second type of resources.

[0136] In one possible approach, when the first type of resources and the second type of resources each include multiple resources, the length of the time domain resources occupied by each of the multiple resources of the first type of resources is the same, and the length of the time domain resources occupied by each of the multiple resources of the second type of resources is also the same, but the length of the time domain resources occupied by resource A is different from the length of the time domain resources occupied by resource B. For example, the length of the time domain resources occupied by resource A is smaller than the length of the time domain resources occupied by resource B. Resource A is any resource of the multiple resources of the first type of resources, and resource B is any resource of the multiple resources of the second type of resources.

[0137] The first type of resources are used to transmit a first format physical random access channel, and the second type of resources are used to transmit a second format physical random access channel. For example, the first type of resources are used to transmit The physical random access channel of the format, the second type of resources is used to transmit Specifically, different formats of the physical random access channel can refer to Table 1 above. In one possible implementation, the number of repetitions of the sequence of the first format physical random access channel is different from the number of repetitions of the sequence of the second format physical random access channel.

[0138] In the present application, a physical random access channel includes a cyclic prefix and a sequence repeated N times, or a physical random access channel includes a cyclic prefix, a sequence repeated N times and a guard interval. N is an integer greater than or equal to 1.

[0139] The number of third resource units occupied by the length of the cyclic prefix, or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval is less than M, where M is the number of second resource units contained in the first resource unit. M is an integer greater than or equal to 1. The length of the cyclic prefix includes the total length of the cyclic prefix on all ROs. If there is a guard interval, the length of the guard interval can also be understood as the total length of the guard interval on all ROs. For example, the third resource unit is an OFDM symbol, the second resource unit is a time slot, the first resource unit is a time slot group consisting of two time slots, and the number of OFDM symbols included in the CP length is 1, which is less than the number of second resource units contained in the first resource unit, which is 2.

[0140] In one possible manner, the number of third resource units included in each resource of the second type of resources is related to at least one of the number of second type resources, the number of second resource units included in each first resource unit, the number of third resource units included in each second resource unit, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of third resource units occupied by the cyclic prefix, or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval.

[0141] Take the first resource unit as a time slot group, the second resource unit as a time slot, and the third resource unit as an OFDM symbol as an example:

[0142] The number of PRACH time slots in a PRACH time slot group is 2, and the PRACH format is The subcarrier spacing is 15kHz. The length of each slot of 15kHz subcarrier spacing is 1ms, and the length of each OFDM symbol of 15kHz is The length of a time slot is 15 OFDM symbols (without CP). The length of one OFDM symbol in a slot is used as the CP, and the CP is allocated to the remaining 14 OFDM symbols.

[0143] The number of time slots in a PRACH time slot group is N, with a total of 15N symbol lengths. M of the symbols are taken as CP, where M≤N. The saved CP length is NM symbol lengths, that is, SCS is the subcarrier spacing. The number of PRACH repetitions is K, the number of ROs in a PRACH time slot group is P, and the total CP length is evenly distributed among P ROs. The CP length of each RO is Each CP length can be used only as a CP (corresponding to the Ax format) or as a CP and a GP (corresponding to the Bx format). In a PRACH timeslot group, 15N-KP-M symbol lengths remain, and the remaining symbols are allocated to S second-type resources (ROs).

[0144] For example, the number of third resource units occupied by each resource in the second type of resources satisfies the following relationship: Q=(LN-K(PS)-M) / S.

[0145] Where Q is the number of third resource units occupied by each resource in the second type of resources (also the number of repetitions of the second type random access channel sequence), L is the number of third resource units included in the second resource unit, N is the number of second resource units included in the first resource unit, K is the number of repetitions of the first type random access channel sequence, P is the number of random access opportunities included in the first resource unit, M is the number of third resource units occupied by the cyclic prefix or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval, and S is the number of second type resources. By way of example, L is 15.

[0146] It should be understood that the above equation is only an example and not a limitation. For example, other possible variations and alternatives should all fall within the scope of protection of this application.

[0147] A time slot group includes 2 time slots, a time slot includes 15 OFDM symbols, the number of repetitions of the physical random access channel sequence is 2, the number of ROs included in the time slot group is 14, the number of symbols occupied by the cyclic prefix and the guard interval is 1, and the number of second type resources is 1. Then the number of OFDM symbols occupied by each resource in the second type resources = (15*2-2(14-1)-1) / 1=3.

[0148] For example, if two PRACH time slots are combined into one PRACH time slot group, the length of one PRACH time slot group is 2ms, which is the length of 30 OFDM symbols (without CP). The number of sequence repetitions is 2. In a PRACH time slot group, the length of one OFDM symbol is taken as the CP, and the remaining 29 symbols are allocated to 13 common ROs (an example of the first type of resource) and 1 enhanced RO (an example of the second type of resource), which are transmitted respectively. format (an example of the first format) and enhanced format (an example of the second format) PRACH. The number of repetitions of the sequence in the format is 2, The number of repetitions of the sequence in the format is 3, as shown in (a) of Figure 3. Wherein, Seq represents a sequence.

[0149] The ordinary RO in this application can also be called short CP ordinary RO, and the enhanced RO can also be called short CP enhanced RO. Also known as short CP format (or normal format), enhanced format Also known as short CP enhanced format (or enhanced format).

[0150] Then the CP length is 144κ·2 -μ The coverage area is 469×2 -μ m, when μ=0,1,2,3, the corresponding coverage ranges are 469m, 234.5m, 117.3m, 58.6m respectively, which can tolerate the aforementioned GNSS error and ephemeris deviation respectively. -μ , CP redundancy is greatly reduced. Since the enhanced format repeats one more sequence than the standard format, it has an improvement of about 1.76dB compared to the standard A1 / B1 format.

[0151] A time slot group includes 2 time slots, a time slot includes 15 OFDM symbols, the number of repetitions of the physical random access channel sequence is 6, the number of ROs included in the time slot group is 4, the number of symbols occupied by the cyclic prefix and the guard interval is 1, and the number of second type resources is 1. Then the number of OFDM symbols occupied by each resource in the second type resources = (15*2-6(4-1)-1) / 1=11.

[0152] For example, the number of PRACH slots in a PRACH slot group is 2, the PRACH format is repeated 6 times, and the subcarrier spacing is 15kHz. The two PRACH slots are combined into one PRACH slot group. The total CP length in one PRACH slot group is 1 symbol length. The remaining 29 symbol lengths are allocated to 3 normal ROs and 1 enhanced RO, which transmit normal RO and enhanced RO respectively. Format (6 repetitions) and reinforcement The PRACH format (11 repetitions) is shown in (b) of FIG3 .

[0153] The CP length is 864κ·2 -μ , shortened to 512κ·2 -μ The coverage area is 3516×2 -μ m is reduced to 2084×2 -μ m, when μ=0,1,2,3, the corresponding coverage range is 2084m, 1042m, 521m, 260m respectively, which can tolerate the above GNSS error and ephemeris deviation respectively. The format is repeated 11 times, normal The format is repeated 6 times, enhanced Format compared to ordinary The format has an improvement of about 2.6dB.

[0154] The resources under the above design method can be called the first resource mode, or the short CP resource mode, or the resource category, resource type, etc. In short, this application does not limit the name of the resource mode. As long as the resources meet the above resource characteristics or meet the above-mentioned ideas, they should be within the scope of protection of the application. The first resource mode belongs to at least one resource mode. For example, the resource mode of the resource in the current prior art can be the second resource mode.

[0155] Optionally, the network device sends a first indication message to the terminal device, and correspondingly, the terminal device receives the first indication message. The first indication message indicates a first resource mode. The first indication message can be carried in a broadcast signal. In other words, the network device indicates a short CP PRACH identifier in the broadcast signal, indicating that the short CP PRACH mode is currently adopted, for example, adding a 1-bit indication in the master information block (MIB) or the system information block (SIB), or multiplexing a reserved bit indication. The value of this bit can be used to indicate a resource mode, for example, a value of 1 indicates a first resource mode, and a value of 0 indicates a second resource mode or a non-first resource mode. It should be understood that the number, value, and meaning of the above-mentioned bits are only examples and not limitations.

[0156] Optionally, the network device indicates relevant parameters of the first resource mode to the terminal device. That is, the relevant parameters of the first resource mode include at least one of the following: the number of third resource units included in each resource of the second type of resources, the number of second type resources, the number of first type resources, the number of second resource units included in each first resource unit, the number of third resource units included in each second resource unit, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of third resource units occupied by the cyclic prefix or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval, the cyclic prefix length of each physical random access channel, or the guard interval length of each physical random access channel.

[0157] There are two ways for network devices to indicate relevant parameters to terminal devices:

[0158] Method 1: The network device directly indicates the relevant parameters (i.e., the second parameter) to the terminal device. For example, the network device sends a third indication message to the terminal device, and the terminal device receives the third indication message in response. The third indication message indicates the second parameter. The second parameter includes at least one of the relevant parameters of the first resource mode.

[0159] Method 2: The network device and the terminal device pre-agree on a parameter list, and an index in the list corresponds to a group of parameters. A group of parameters includes at least one of the above-mentioned related parameters. The list can have multiple indexes, and multiple indexes correspond one-to-one to multiple groups of parameters. The network device indicates a group of parameters by indicating an index to the terminal device. For example, the network device sends a second indication message to the terminal device, and correspondingly, the terminal device receives the second indication message, and the second indication message indicates a first index, and the first index corresponds to a first parameter. The first parameter includes at least one of the related parameters of the above-mentioned first resource mode. Indicating the configuration index of short CP PRACH and RO in the broadcast signal can reduce the indication overhead.

[0160] It should be understood that the form of the correspondence between indexes and parameters is not limited to a list.

[0161] Optionally, the terminal device may also determine whether to send a random access channel in the first format or a random access channel in the second format according to a preset condition.

[0162] The preset condition may be related to the coverage of the beam. For example, if the terminal device is located within the coverage of the beam but far from the center of the beam, or at the edge of the coverage of the beam, the terminal device sends a second format random access channel (such as an enhanced RO) to improve the transmission reliability of the random access channel. The beam is the beam used for communication between the network device and the terminal device.

[0163] In one example, when the ratio of the distance between the terminal device and the beam center to the beam radius is greater than or equal to a first threshold, a physical random access channel in a second format is sent via the second resource; when the ratio of the distance between the terminal device and the beam center to the beam radius is less than the first threshold, a physical random access channel in a first format is sent via the first resource. The beam center and beam radius may be sent by the network device to the terminal device. For example, the network device sends a third parameter to the terminal device, and the terminal device receives the third parameter in response, where the third parameter indicates the beam center and beam radius.

[0164] Specifically, taking a satellite as an example of a network device, the satellite sends down the beam center position and beam coverage range (such as the beam radius R). The terminal device decides whether to send PRACH in a normal RO or in an enhanced RO based on its own geographical location, beam center position, and beam coverage range. For example, the distance d1 between the terminal device and the beam center point can be calculated. If d1 / R>H1, PRACH is sent in the enhanced RO (or PRACH is sent in the enhanced RO with a higher probability P1). Otherwise, PRACH is sent in the normal RO (or PRACH is sent in the normal RO with a higher probability P2). H1 (i.e., the first threshold) can be predefined or configured.

[0165] In another example, when the distance between the terminal device and the beam center position is greater than or equal to the distance between the beam center position and the reference point position, a physical random access channel of the second format is sent through the second resource; when the distance between the terminal device and the beam center position is less than the distance between the beam center position and the reference point position, a physical random access channel of the first format is sent through the first resource.

[0166] The beam center position and / or reference point position may be indicated by a network device. For example, the network device sends a third parameter to the terminal device, and the terminal device receives the third parameter in response, where the third parameter indicates the beam center position and / or reference point position.

[0167] Specifically, taking a satellite as an example of a network device, the satellite sends the beam center position and the reference point position. The terminal device calculates the distance d1 between its own position and the beam center position, and the distance d2 between the beam center and the reference point. If d1>d2, PRACH is sent in the enhanced RO (or PRACH is sent in the enhanced RO with a higher probability P1), otherwise PRACH is sent in the ordinary RO (or PRACH is sent in the ordinary RO with a higher probability P2).

[0168] The preset condition may be related to received signal power. For example, when the terminal device receives a signal with a power greater than or equal to a power threshold, a physical random access channel of a first format is transmitted via a first resource; when the terminal device receives a signal with a power less than the power threshold, a physical random access channel of a second format is transmitted via a second resource.

[0169] The power threshold may be known by the network device. For example, the network device sends a third parameter to the terminal device, and the terminal device receives the third parameter in response, where the third parameter indicates the power threshold.

[0170] Specifically, taking a satellite as an example of a network device, the satellite sends a power threshold P th , if the terminal device receives the signal power greater than or equal to P th , then PRACH is sent in the normal RO, if the terminal device receives the signal power less than P th , then PRACH is sent in the enhanced RO.

[0171] S220, the terminal device sends the first format physical random access channel through the first resource, or sends the second format physical random access channel through the second resource. Correspondingly, the network device receives the first format physical random access channel through the first resource, or receives the second format physical random access channel through the second resource.

[0172] In this method, through new resource design, for example, in the NTN scenario, a short CP PRACH format is designed, and the saved CP resources and GP resources are used as access resources, access resources are increased, thereby improving access capacity, avoiding resource waste, and further improving communication reliability.

[0173] It is understood that, in order to implement the functions in the above embodiments, the base station and the terminal include hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should readily appreciate that, in conjunction with the units and method steps of the various examples described in the embodiments disclosed in this application, this application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in hardware or in a computer software-driven hardware manner depends on the specific application scenario and design constraints of the technical solution.

[0174] Figures 4 and 5 are schematic diagrams of the structures of possible communication devices provided in embodiments of the present application. These communication devices can be used to implement the functions of the terminal or base station in the above-mentioned method embodiments, thereby also achieving the beneficial effects of the above-mentioned method embodiments. In the embodiments of the present application, the communication device can be one of the terminals 120a-120j shown in Figure 1, or it can be the base station 110a or 110b shown in Figure 1, or it can be a module (such as a chip) applied to the terminal or base station.

[0175] As shown in Figure 4, the communication device 400 includes a processing unit 410 and a transceiver unit 420. The communication device 400 is used to implement the functions of the terminal device or network device in the method embodiment shown in Figure 2 above.

[0176] When the communication device 400 is used to implement the functions of the terminal device in the method embodiment shown in FIG2 , the transceiver unit 420 may be configured to transmit a physical random access channel in a first format via a first resource, or to transmit a physical random access channel in a second format via a second resource, where the second resource belongs to a second type of resource; the processing unit 410 may be configured to obtain the first resource. The transceiver unit 420 may also be configured to receive first indication information, second indication information, third indication information, third parameters, and the like.

[0177] When the communication apparatus 400 is used to implement the function of the network device in the method embodiment shown in FIG2 : the transceiver unit 420 is used to receive a physical random access channel of the first format through the first resource, or to receive a physical random access channel of the second format through the second resource.

[0178] The transceiver unit 420 may also be configured to send first indication information, second indication information, third indication information, third parameters, and the like.

[0179] A more detailed description of the processing unit 410 and the transceiver unit 420 can be directly obtained by referring to the relevant description in the method embodiment shown in FIG2 , and is not repeated here.

[0180] As shown in Figure 5, communication device 500 includes a processor 510 and an interface circuit 520. Processor 510 and interface circuit 520 are coupled to each other. It is understood that interface circuit 520 can be a transceiver or an input / output interface. Optionally, communication device 500 may also include a memory 530 for storing instructions executed by processor 510, input data required by processor 510 to execute instructions, or data generated after processor 510 executes instructions.

[0181] When the communication device 500 is used to implement the method shown in FIG. 2 , the processor 510 is used to implement the functions of the processing unit 410 , and the interface circuit 520 is used to implement the functions of the transceiver unit 420 .

[0182] When the communication device is a chip used in a terminal, the terminal chip implements the functions of the terminal in the above method embodiments. The terminal chip receives information from other modules in the terminal (such as a radio frequency module or antenna), and the information is sent by the base station to the terminal; or the terminal chip sends information to other modules in the terminal (such as a radio frequency module or antenna), and the information is sent by the terminal to the base station.

[0183] When the above-mentioned communication device is a module applied to a base station, the base station module implements the functions of the base station in the above-mentioned method embodiment. The base station module receives information from other modules in the base station (such as a radio frequency module or an antenna), and the information is sent by the terminal to the base station; or the base station module sends information to other modules in the base station (such as a radio frequency module or an antenna), and the information is sent by the base station to the terminal. The base station module here can be the baseband chip of the base station, or it can be a DU or other module. The DU here can be a DU under the open radio access network (O-RAN) architecture.

[0184] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0185] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disk, mobile hard disk, CD-ROM or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be an integral part of the processor. The processor and storage medium can be located in an ASIC. In addition, the ASIC can be located in a base station or a terminal. The processor and storage medium can also exist in a base station or a terminal as discrete components.

[0186] In the above embodiments, all or part of the embodiments may be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; an optical medium, such as a digital video disk; or a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0187] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0188] Depending on whether the specification uses optional: In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the following situations: A exists alone, B exists alone, and A and B exist at the same time, where A and B can be singular or plural. In the text description of this application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship; in the formula of this application, the character " / " indicates that the previous and next associated objects are in a "division" relationship. "At least one of the following" or similar expressions is used to represent any combination of the listed items; for example, at least one of A, B and (or) C can represent the following situations: A exists alone, B exists alone, C exists alone, A and B exist at the same time, B and C exist at the same time, A and C exist at the same time, and A, B and C exist at the same time, where A, B, and C can be singular or plural.

[0189] It is understood that the various numbers used in the embodiments of this application are merely for ease of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not necessarily imply a specific order of execution; the order of execution of the processes should be determined by their functions and inherent logic.

Claims

1. A communication method, characterized in that: include: Acquire a first resource, where the first resource belongs to a first type of resource, the first type of resource and the second type of resource belong to the same first resource unit, the first type of resource is used to transmit a first format physical random access channel, the second type of resource is used to transmit a second format physical random access channel, the physical random access channel includes a cyclic prefix and a sequence repeated N times, or the physical random access channel includes the cyclic prefix, the sequence repeated N times and a guard interval, N is greater than or equal to 1, the first type of resource is different from the second type of resource in length, the number of third resource units occupied by the length of the cyclic prefix is ​​less than M, or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval is less than M, M is the number of second resource units included in the first resource unit, each of the first resource units includes at least one of the second resource units, and each of the second resource units includes at least one of the third resource units, The first format physical random access channel is sent through the first resource, or a second resource is acquired and the second format physical random access channel is sent through the second resource, where the second resource belongs to the second type of resource.

2. The method according to claim 1, characterized in that: The number of repetitions of the sequence of the first-format physical random access channel is different from the number of repetitions of the sequence of the second-format physical random access channel.

3. The method according to claim 1 or 2, characterized in that: The number of the third resource units included in each resource of the second type of resources is related to at least one of the number of the second type of resources, the number of the second resource units included in each first resource unit, the number of third resource units included in each second resource unit, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix, or the sum of the number of the third resource units occupied by the cyclic prefix and the protection interval.

4. The method according to claim 3, characterized in that The number of the third resource units included in each resource of the second type of resources satisfies the following relationship: Q=(LN-K(PS)-M) / S; Among them, Q is the number of the third resource units included in each resource of the second type of resources, L is the number of the third resource units included in each second resource unit, N is the number of the second resource units included in each first resource unit, K is the number of repetitions of the sequence of the physical random access channel, P is the number of random access opportunities, M is the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the protection interval, and S is the number of the second type of resources.

5. The method according to any one of claims 1 to 4, characterized in that The number of the second resource units included in each of the first resource units is 2, the number of the third resource units occupied by each resource in the first type of resources is 2, the number of the third resource units occupied by each resource in the second type of resources is 3, the number of repetitions of the sequence of the first format physical random access channel is 2, the number of repetitions of the sequence of the second format physical random access channel is 3, and the first resource unit includes 13 first type resources and 1 second type resource.

6. The method according to any one of claims 1 to 4, characterized in that The number of the second resource units included in each of the first resource units is 2, the number of the third time units occupied by each resource of the first type of resources is 6, the number of the third time units occupied by each resource of the second type of resources is 11, the number of repetitions of the sequence of the first format physical random access channel is 6, the number of repetitions of the sequence of the second format physical random access channel is 11, and the first resource unit includes 3 first type resources and 1 second type resource.

7. The method according to any one of claims 1 to 6, characterized in that The method further comprises: Receive first indication information, where the first indication information indicates a first resource mode, where the first resource mode belongs to at least one resource mode, where the first resource mode includes first-type resources and second-type resources, where the first-type resources and second-type resources belong to the same first resource unit, where the first-type resources are used to transmit a first-format physical random access channel, where the second-type resources are used to transmit a second-format physical random access channel, where the physical random access channel includes a cyclic prefix and a sequence repeated N times, or a cyclic prefix, a sequence repeated N times, and a guard interval, where N is greater than or equal to 1, where the first-type resources are different in length from the second-type resources, where the number of third resource units occupied by the length of the cyclic prefix, or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval is less than M, where M is the number of second resource units contained in the first resource unit, where each of the first resource units includes at least one of the second resource units, and where each of the second resource units includes at least one of the third resource units.

8. The method according to any one of claims 1 to 7, characterized in that The method further comprises: Receive second indication information, where the second indication information indicates a first index, where the first index corresponds to a first parameter, where the first parameter includes at least one of the following: the number of the third resource units included in each resource of the second type of resources, the number of the second type of resources, the number of the first type of resources, the number of the second resource units included in each of the first resource units, the number of third resource units included in each of the second resource units, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the protection interval, the cyclic prefix length of each physical random access channel or the protection interval length of each physical random access channel, where the first parameter belongs to at least one parameter, where the at least one parameter corresponds one-to-one to at least one index, and where the first index belongs to the at least one index.

9. The method according to any one of claims 1 to 8, characterized in that The method further comprises: Receive third indication information, wherein the third indication information indicates a second parameter, wherein the second parameter includes at least one of the following: the number of the third resource units included in each resource of the second type of resources, the number of the second type of resources, the number of the first type of resources, the number of the second resource units included in each of the first resource units, the number of third resource units included in each of the second resource units, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the guard interval, the cyclic prefix length of each physical random access channel or the guard interval length of each physical random access channel.

10. The method according to claim 8 or 9, characterized in that: The second indication information and / or the third indication information is carried in a broadcast signal.

11. The method according to any one of claims 1 to 10, characterized in that The method further comprises: receiving a third parameter, wherein the third parameter is used to determine a preset condition; Determine whether to send a physical random access channel in the first format or a physical random access channel in the second format according to the preset condition.

12. The method according to claim 11, characterized in that The third parameter indicates the coverage of a beam, where the beam is used for communication between the network device and the terminal device.

13. The method according to claim 12, characterized in that The third parameter indicates the center position and beam radius of the beam, and the preset condition is: When the ratio of the distance between the terminal device and the center position of the beam to the beam radius is greater than or equal to a first threshold, sending a physical random access channel of the second format through the second resource; When the ratio of the distance between the terminal device and the center position of the beam to the beam radius is less than the first threshold, a physical random access channel of the first format is sent through the first resource.

14. The method according to claim 12, characterized in that The third parameter includes the beam center position and the reference point position, and the preset condition is: When the distance between the terminal device and the center position of the beam is greater than or equal to the distance between the center position of the beam and the reference point position, sending the physical random access channel of the second format through the second resource; When the distance between the terminal device and the beam center position is less than the distance between the beam center position and the reference point position, the physical random access channel of the first format is sent through the first resource.

15. The method according to claim 11, characterized in that The third parameter is a power threshold, and the preset condition is: When the signal power received by the terminal device is greater than or equal to the power threshold, sending a physical random access channel in the first format through the first resource; When the signal power received by the terminal device is less than the power threshold, a physical random access channel in the second format is sent through the second resource.

16. A communication method, characterized in that: include: receiving a physical random access channel of a first format through a first resource, or receiving a physical random access channel of a second format through a second resource, Among them, the first resource belongs to a first type of resource, the first type of resource and the second type of resource belong to the same first resource unit, the first type of resource is used to transmit a first format physical random access channel, the second type of resource is used to transmit a second format physical random access channel, the physical random access channel includes a cyclic prefix and a sequence repeated N times, or a cyclic prefix, a sequence repeated N times and a protection interval, N is greater than or equal to 1, the length of the first type of resource is different from that of the second type of resource, the number of third resource units occupied by the length of the cyclic prefix, or the sum of the number of third resource units occupied by the cyclic prefix and the protection interval is less than M, M is the number of second resource units contained in the first resource unit, each of the first resource units includes at least one of the second resource units, and each of the second resource units includes at least one of the third resource units.

17. The method according to claim 16, characterized in that The number of repetitions of the sequence of the first-format physical random access channel is different from the number of repetitions of the sequence of the second-format physical random access channel.

18. The method according to claim 16 or 17, characterized in that The number of the third resource units included in each resource of the second type of resources is related to at least one of the number of the second type of resources, the number of the second resource units included in each first resource unit, the number of third resource units included in each second resource unit, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix, or the sum of the number of the third resource units occupied by the cyclic prefix and the protection interval.

19. The method according to claim 18, characterized in that The number of the third resource units included in each resource of the second type of resources satisfies the following relationship: Q=(LN-K(PS)-M) / S; Among them, Q is the number of the third resource units included in each resource of the second type of resources, L is the number of the third resource units included in each second resource unit, N is the number of the second resource units included in each first resource unit, K is the number of repetitions of the sequence of the physical random access channel, P is the number of random access opportunities, M is the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the protection interval, and S is the number of the second type of resources.

20. The method according to any one of claims 16 to 19, characterized in that The number of the second resource units included in each of the first resource units is 2, the number of the third resource units occupied by each resource in the first type of resources is 2, the number of the third resource units occupied by each resource in the second type of resources is 3, the number of repetitions of the sequence of the first format physical random access channel is 2, the number of repetitions of the sequence of the second format physical random access channel is 3, and the first resource unit includes 13 first type resources and 1 second type resource.

21. The method according to any one of claims 16 to 19, characterized in that The number of the second resource units included in each of the first resource units is 2, the number of the third time units occupied by each resource of the first type of resources is 6, the number of the third time units occupied by each resource of the second type of resources is 11, the number of repetitions of the sequence of the first format physical random access channel is 6, the number of repetitions of the sequence of the second format physical random access channel is 11, and the first resource unit includes 3 first type resources and 1 second type resource.

22. The method according to any one of claims 16 to 21, characterized in that The method further comprises: Send first indication information, where the first indication information indicates a first resource mode, where the first resource mode belongs to at least one resource mode, where the first resource mode includes first type resources and second type resources, where the first type resources and second type resources belong to the same first resource unit, where the first type resources are used to transmit a first format physical random access channel, where the second type resources are used to transmit a second format physical random access channel, where the physical random access channel includes a cyclic prefix and a sequence repeated N times, or a cyclic prefix, a sequence repeated N times, and a guard interval, where N is greater than or equal to 1, where the first type resources are different in length from the second type resources, where the number of third resource units occupied by the length of the cyclic prefix, or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval is less than M, where M is the number of second resource units contained in the first resource unit, where each of the first resource units includes at least one of the second resource units, and where each of the second resource units includes at least one of the third resource units.

23. The method according to any one of claims 16 to 22, characterized in that The method further comprises: Send second indication information, where the second indication information indicates a first index, where the first index corresponds to a first parameter, where the first parameter includes at least one of the following: the number of the third resource units included in each resource of the second type of resources, the number of the second type of resources, the number of the first type of resources, the number of the second resource units included in each of the first resource units, the number of third resource units included in each of the second resource units, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the protection interval, the cyclic prefix length of each physical random access channel or the protection interval length of each physical random access channel, where the first parameter belongs to at least one parameter, the at least one parameter corresponds one-to-one to at least one index, and the first index belongs to the at least one index.

24. The method according to any one of claims 16 to 23, characterized in that The method further comprises: Send a third indication message, wherein the third indication message indicates a second parameter, wherein the second parameter includes at least one of the following: the number of the third resource units included in each resource of the second type of resources, the number of the second type of resources, the number of the first type of resources, the number of the second resource units included in each of the first resource units, the number of third resource units included in each of the second resource units, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the guard interval, the cyclic prefix length of each physical random access channel or the guard interval length of each physical random access channel.

25. The method according to claim 23 or 24, characterized in that The second indication information and / or the third indication information is carried in a broadcast signal.

26. The method according to any one of claims 16 to 25, characterized in that The method further comprises: A third parameter is sent, where the third parameter is used to determine a preset condition, where the preset condition is used to determine whether the terminal device sends a physical random access channel in the first format or a physical random access channel in the second format.

27. The method according to claim 26, characterized in that The third parameter indicates the coverage of a beam, where the beam is used for communication between the network device and the terminal device.

28. The method according to claim 27, characterized in that The third parameter indicates the center position and beam radius of the beam, and the preset condition is: When the ratio of the distance between the terminal device and the center position of the beam to the beam radius is greater than or equal to a first threshold, sending a physical random access channel of the second format through the second resource; When the ratio of the distance between the terminal device and the center position of the beam to the beam radius is less than the first threshold, a physical random access channel of the first format is sent through the first resource.

29. The method according to claim 27, characterized in that The third parameter includes the beam center position and the reference point position, and the preset condition is: When the distance between the terminal device and the center position of the beam is greater than or equal to the distance between the center position of the beam and the reference point position, sending the physical random access channel of the second format through the second resource; When the distance between the terminal device and the beam center position is less than the distance between the beam center position and the reference point position, the physical random access channel of the first format is sent through the first resource.

30. The method according to claim 26, characterized in that The third parameter is a power threshold, and the preset condition is: When the signal power received by the terminal device is greater than or equal to the power threshold, sending a physical random access channel in the first format through the first resource; When the signal power received by the terminal device is less than the power threshold, a physical random access channel in the second format is sent through the second resource.

31. A communication device, characterized in that: Including processing unit and transceiver unit, The processing unit is used to obtain a first resource, the first resource belongs to a first type of resource, the first type of resource and the second type of resource belong to the same first resource unit, the first type of resource is used to transmit a first format physical random access channel, the second type of resource is used to transmit a second format physical random access channel, the physical random access channel includes a cyclic prefix and a sequence repeated N times, or the physical random access channel includes the cyclic prefix, the sequence repeated N times and a guard interval, N is greater than or equal to 1, the first type of resource is different from the second type of resource in length, the number of third resource units occupied by the length of the cyclic prefix is ​​less than M, or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval is less than M, M is the number of second resource units included in the first resource unit, each of the first resource units includes at least one of the second resource units, and each of the second resource units includes at least one of the third resource units, The transceiver unit is used to send the first format physical random access channel through the first resource, or obtain a second resource and send the second format physical random access channel through the second resource, and the second resource belongs to the second type of resource.

32. The device according to claim 31, characterized in that The number of repetitions of the sequence of the first-format physical random access channel is different from the number of repetitions of the sequence of the second-format physical random access channel.

33. The device according to claim 31 or 32, characterized in that The number of the third resource units included in each resource of the second type of resources is related to at least one of the number of the second type of resources, the number of the second resource units included in each first resource unit, the number of third resource units included in each second resource unit, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix, or the sum of the number of the third resource units occupied by the cyclic prefix and the protection interval.

34. The device according to claim 33, characterized in that The number of the third resource units included in each resource of the second type of resources satisfies the following relationship: Q=(LN-K(PS)-M) / S; Among them, Q is the number of the third resource units included in each resource of the second type of resources, L is the number of the third resource units included in each second resource unit, N is the number of the second resource units included in each first resource unit, K is the number of repetitions of the sequence of the physical random access channel, P is the number of random access opportunities, M is the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the protection interval, and S is the number of the second type of resources.

35. The device according to any one of claims 31 to 34, characterized in that The number of the second resource units included in each of the first resource units is 2, the number of the third resource units occupied by each resource in the first type of resources is 2, the number of the third resource units occupied by each resource in the second type of resources is 3, the number of repetitions of the sequence of the first format physical random access channel is 2, the number of repetitions of the sequence of the second format physical random access channel is 3, and the first resource unit includes 13 first type resources and 1 second type resource.

36. The device according to any one of claims 31 to 34, characterized in that The number of the second resource units included in each of the first resource units is 2, the number of the third time units occupied by each resource of the first type of resources is 6, the number of the third time units occupied by each resource of the second type of resources is 11, the number of repetitions of the sequence of the first format physical random access channel is 6, the number of repetitions of the sequence of the second format physical random access channel is 11, and the first resource unit includes 3 first type resources and 1 second type resource.

37. The device according to any one of claims 31 to 36, characterized in that The transceiver unit is also used for: Receive first indication information, where the first indication information indicates a first resource mode, where the first resource mode belongs to at least one resource mode, where the first resource mode includes first-type resources and second-type resources, where the first-type resources and second-type resources belong to the same first resource unit, where the first-type resources are used to transmit a first-format physical random access channel, where the second-type resources are used to transmit a second-format physical random access channel, where the physical random access channel includes a cyclic prefix and a sequence repeated N times, or a cyclic prefix, a sequence repeated N times, and a guard interval, where N is greater than or equal to 1, where the first-type resources are different in length from the second-type resources, where the number of third resource units occupied by the length of the cyclic prefix, or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval is less than M, where M is the number of second resource units contained in the first resource unit, where each of the first resource units includes at least one of the second resource units, and where each of the second resource units includes at least one of the third resource units.

38. The device according to any one of claims 31 to 37, characterized in that The transceiver unit is also used for: Receive second indication information, where the second indication information indicates a first index, where the first index corresponds to a first parameter, where the first parameter includes at least one of the following: the number of the third resource units included in each resource of the second type of resources, the number of the second type of resources, the number of the first type of resources, the number of the second resource units included in each of the first resource units, the number of third resource units included in each of the second resource units, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the protection interval, the cyclic prefix length of each physical random access channel or the protection interval length of each physical random access channel, where the first parameter belongs to at least one parameter, where the at least one parameter corresponds one-to-one to at least one index, and where the first index belongs to the at least one index.

39. The device according to any one of claims 31 to 38, characterized in that The transceiver unit is also used for: Receive third indication information, wherein the third indication information indicates a second parameter, wherein the second parameter includes at least one of the following: the number of the third resource units included in each resource of the second type of resources, the number of the second type of resources, the number of the first type of resources, the number of the second resource units included in each of the first resource units, the number of third resource units included in each of the second resource units, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the guard interval, the cyclic prefix length of each physical random access channel or the guard interval length of each physical random access channel.

40. The device according to claim 38 or 39, characterized in that The second indication information and / or the third indication information is carried in a broadcast signal.

41. The device according to any one of claims 31 to 40, characterized in that The transceiver unit is further used to receive a third parameter, and the third parameter is used to determine the preset condition; The processing unit is further configured to determine, according to the preset condition, whether to send a physical random access channel in the first format or a physical random access channel in the second format.

42. The device according to claim 41, characterized in that The third parameter indicates the coverage of a beam, where the beam is used for communication between the network device and the terminal device.

43. The device according to claim 42, characterized in that The third parameter indicates the center position and beam radius of the beam, and the preset condition is: When the ratio of the distance between the terminal device and the center position of the beam to the beam radius is greater than or equal to a first threshold, sending a physical random access channel of the second format through the second resource; When the ratio of the distance between the terminal device and the center position of the beam to the beam radius is less than the first threshold, a physical random access channel of the first format is sent through the first resource.

44. The device according to claim 42, characterized in that The third parameter includes the beam center position and the reference point position, and the preset condition is: When the distance between the terminal device and the center position of the beam is greater than or equal to the distance between the center position of the beam and the reference point position, sending the physical random access channel of the second format through the second resource; When the distance between the terminal device and the beam center position is less than the distance between the beam center position and the reference point position, the physical random access channel of the first format is sent through the first resource.

45. The device according to claim 41, characterized in that The third parameter is a power threshold, and the preset condition is: When the signal power received by the terminal device is greater than or equal to the power threshold, sending a physical random access channel in the first format through the first resource; When the signal power received by the terminal device is less than the power threshold, a physical random access channel in the second format is sent through the second resource.

46. ​​A communication device, characterized in that: Including transceiver unit, The transceiver unit is used to receive a physical random access channel of a first format through a first resource, or to receive a physical random access channel of a second format through a second resource, Among them, the first resource belongs to a first type of resource, the first type of resource and the second type of resource belong to the same first resource unit, the first type of resource is used to transmit a first format physical random access channel, the second type of resource is used to transmit a second format physical random access channel, the physical random access channel includes a cyclic prefix and a sequence repeated N times, or a cyclic prefix, a sequence repeated N times and a protection interval, N is greater than or equal to 1, the length of the first type of resource is different from that of the second type of resource, the number of third resource units occupied by the length of the cyclic prefix, or the sum of the number of third resource units occupied by the cyclic prefix and the protection interval is less than M, M is the number of second resource units contained in the first resource unit, each of the first resource units includes at least one of the second resource units, and each of the second resource units includes at least one of the third resource units.

47. The device according to claim 46, characterized in that The number of repetitions of the sequence of the first-format physical random access channel is different from the number of repetitions of the sequence of the second-format physical random access channel.

48. The device according to claim 46 or 47, characterized in that The number of the third resource units included in each resource of the second type of resources is related to at least one of the number of the second type of resources, the number of the second resource units included in each first resource unit, the number of third resource units included in each second resource unit, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix, or the sum of the number of the third resource units occupied by the cyclic prefix and the protection interval.

49. The device according to claim 48, characterized in that The number of the third resource units included in each resource of the second type of resources satisfies the following relationship: Q=(LN-K(PS)-M) / S; Among them, Q is the number of the third resource units included in each resource of the second type of resources, L is the number of the third resource units included in each second resource unit, N is the number of the second resource units included in each first resource unit, K is the number of repetitions of the sequence of the physical random access channel, P is the number of random access opportunities, M is the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the protection interval, and S is the number of the second type of resources.

50. The device according to any one of claims 46 to 49, characterized in that The number of the second resource units included in each of the first resource units is 2, the number of the third resource units occupied by each resource in the first type of resources is 2, the number of the third resource units occupied by each resource in the second type of resources is 3, the number of repetitions of the sequence of the first format physical random access channel is 2, the number of repetitions of the sequence of the second format physical random access channel is 3, and the first resource unit includes 13 first type resources and 1 second type resource.

51. The device according to any one of claims 46 to 49, characterized in that The number of the second resource units included in each of the first resource units is 2, the number of the third time units occupied by each resource of the first type of resources is 6, the number of the third time units occupied by each resource of the second type of resources is 11, the number of repetitions of the sequence of the first format physical random access channel is 6, the number of repetitions of the sequence of the second format physical random access channel is 11, and the first resource unit includes 3 first type resources and 1 second type resource.

52. The device according to any one of claims 46 to 51, characterized in that The transceiver unit is also used for: Send first indication information, where the first indication information indicates a first resource mode, where the first resource mode belongs to at least one resource mode, where the first resource mode includes first type resources and second type resources, where the first type resources and second type resources belong to the same first resource unit, where the first type resources are used to transmit a first format physical random access channel, where the second type resources are used to transmit a second format physical random access channel, where the physical random access channel includes a cyclic prefix and a sequence repeated N times, or a cyclic prefix, a sequence repeated N times, and a guard interval, where N is greater than or equal to 1, where the first type resources are different in length from the second type resources, where the number of third resource units occupied by the length of the cyclic prefix, or the sum of the number of third resource units occupied by the cyclic prefix and the guard interval is less than M, where M is the number of second resource units contained in the first resource unit, where each of the first resource units includes at least one of the second resource units, and where each of the second resource units includes at least one of the third resource units.

53. The device according to any one of claims 46 to 52, characterized in that The transceiver unit is also used for: Send second indication information, where the second indication information indicates a first index, where the first index corresponds to a first parameter, where the first parameter includes at least one of the following: the number of the third resource units included in each resource of the second type of resources, the number of the second type of resources, the number of the first type of resources, the number of the second resource units included in each of the first resource units, the number of third resource units included in each of the second resource units, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the protection interval, the cyclic prefix length of each physical random access channel or the protection interval length of each physical random access channel, where the first parameter belongs to at least one parameter, the at least one parameter corresponds one-to-one to at least one index, and the first index belongs to the at least one index.

54. The device according to any one of claims 46 to 53, characterized in that The transceiver unit is also used for: Send a third indication message, wherein the third indication message indicates a second parameter, wherein the second parameter includes at least one of the following: the number of the third resource units included in each resource of the second type of resources, the number of the second type of resources, the number of the first type of resources, the number of the second resource units included in each of the first resource units, the number of third resource units included in each of the second resource units, the number of repetitions of the sequence of the physical random access channel, the number of random access opportunities, the number of the third resource units occupied by the cyclic prefix or the sum of the number of the third resource units occupied by the cyclic prefix and the guard interval, the cyclic prefix length of each physical random access channel or the guard interval length of each physical random access channel.

55. The device according to claim 53 or 54, characterized in that The second indication information and / or the third indication information is carried in a broadcast signal.

56. The device according to any one of claims 46 to 55, characterized in that The transceiver unit is also used for: A third parameter is sent, where the third parameter is used to determine a preset condition, where the preset condition is used to determine whether the terminal device sends a physical random access channel in the first format or a physical random access channel in the second format.

57. The device according to claim 56, characterized in that The third parameter indicates the coverage of a beam, where the beam is used for communication between the network device and the terminal device.

58. The device according to claim 57, characterized in that The third parameter indicates the center position and beam radius of the beam, and the preset condition is: When the ratio of the distance between the terminal device and the center position of the beam to the beam radius is greater than or equal to a first threshold, sending a physical random access channel of the second format through the second resource; When the ratio of the distance between the terminal device and the center position of the beam to the beam radius is less than the first threshold, a physical random access channel of the first format is sent through the first resource.

59. The device according to claim 57, characterized in that The third parameter includes the beam center position and the reference point position, and the preset condition is: When the distance between the terminal device and the center position of the beam is greater than or equal to the distance between the center position of the beam and the reference point position, sending the physical random access channel of the second format through the second resource; When the distance between the terminal device and the beam center position is less than the distance between the beam center position and the reference point position, the physical random access channel of the first format is sent through the first resource.

60. The device according to claim 56, characterized in that The third parameter is a power threshold, and the preset condition is: When the signal power received by the terminal device is greater than or equal to the power threshold, sending a physical random access channel in the first format through the first resource; When the signal power received by the terminal device is less than the power threshold, a physical random access channel in the second format is sent through the second resource.

61. A communication device, characterized in that: Comprising modules for executing the method as claimed in any one of claims 1 to 15.

62. A communication device, characterized in that: Comprising means for performing the method as claimed in any one of claims 16 to 30.

63. A communication system, characterized in that: Comprising a communication device as described in claim 61 and claim 62.

64. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program or instruction, and when the computer program or instruction is executed on a computer, the computer is caused to execute the method according to any one of claims 1 to 30.

65. A computer program product, characterized in that The computer program product comprises instructions for performing the method of any one of claims 1 to 30.

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