Communication method and apparatus

Abstract

The present application relates to the technical field of communications, and discloses a communication method and apparatus, for solving the problem of how a terminal device determines appropriate path loss (PL) information. The method comprises: receiving first downlink control information (DCI), wherein the first DCI is used for a random access procedure, and the first DCI indicates whether the transmission power of a physical random access channel (PRACH) in the random access procedure is related to a PL offset associated with an indicated TCI state; and determining the transmission power of the PRACH on the basis of the first DCI.

Description

A communication method and apparatus

[0001] This application claims priority to the Chinese Patent Application No. 202411382756.7, filed on September 27, 2024, and entitled "A communication method and apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

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

[0003] In a cellular system, a first network device (such as a first transmission and reception point, TRP) can send a PDCCH order to a terminal device, thereby triggering the terminal device to transmit a PDCCH order PRACH to the first network device or a second network device (such as a second TRP). Because the terminal device has different path loss information to the first network device and the second network device, the terminal device needs to apply different path loss information when determining the PRACH transmission power. Currently, the terminal device can determine the appropriate path loss information by indicating the reference signals from different network devices. In order to improve the uplink coverage of the cellular communication system, an uplink (UL) transmission and reception point (TRP) is introduced in the cellular communication system, and the UL TRP can not have available downlink reference signals. In this case, how to make the terminal device determine the appropriate path loss information is a problem to be solved. SUMMARY

[0004] Embodiments of the present application provide a communication method, apparatus and system to solve the problem of how to make the terminal device determine the appropriate path loss information.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] In a first aspect, the embodiments of the present application provide a communication method, which can be executed by a terminal device and a functional module or a chip in the terminal device. Taking the terminal device as an example, the method comprises: receiving a first downlink control information (DCI), the first DCI being used for a random access procedure, the first DCI indicating whether the transmission power of a physical random access channel (PRACH) in the random access procedure is related to a PL offset associated with an indicated TCI state; and determining the transmission power of the PRACH according to the first DCI.

[0007] Based on the method of the first aspect, whether the terminal device applies the PL offset when determining the PRACH transmission power is directly indicated by the PDCCH-order DCI, so as to avoid that the power for sending the PRACH is too high or too low, and improve the PRACH efficiency.

[0008] In a possible design, the first DCI includes a first field; and determining the PRACH transmission power according to the first DCI includes: when the first field of the first DCI is a first value, the PRACH transmission power is related to the PL offset associated with the indicated TCI state; or when the first field of the first DCI is a second value, the PRACH transmission power is not related to the PL offset associated with the indicated TCI state.

[0009] When the first field of the first DCI is the first value, the PRACH transmission power is not related to the PL offset associated with the indicated TCI state; and when the first field of the first DCI is the second value, the PRACH transmission power is related to the PL offset associated with the indicated TCI state.

[0010] In a possible design, the first field is a PRACH association indicator.

[0011] In a possible design, the first DCI includes: a PDCCH order DCI or a DCI format 1_0 or a PDCCH order; and the PRACH is a PDCCH order PRACH, or a RACH triggered by the PDCCH order.

[0012] In the second aspect, an embodiment of the present application provides a communication method, which can be executed by a network device and a functional module or a chip in the network device, and is taken as an example that the network device executes, and the method includes: sending a first DCI, the first DCI is used for a random access process, the first DCI indicates whether the PRACH transmission power in the random access process is related to the PL offset associated with the indicated TCI state, and the first DCI is used for determining the PRACH transmission power.

[0013] Based on the method of the second aspect, whether the terminal device applies the PL offset when determining the PRACH transmission power is directly indicated by the PDCCH-order DCI, so as to avoid that the power for sending the PRACH is too high or too low, and improve the PRACH efficiency.

[0014] In a possible design, the first DCI includes a first field; and determining the transmission power of the PRACH according to the first DCI includes: when the first field of the first DCI is a first value, the transmission power of the PRACH is related to a PL offset associated with an indicated TCI state; when the first field of the first DCI is a second value, the transmission power of the PRACH is not related to the PL offset associated with the indicated TCI state; or

[0015] when the first field of the first DCI is the first value, the transmission power of the PRACH is not related to the PL offset associated with the indicated TCI state; and when the first field of the first DCI is the second value, the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state.

[0016] In a possible design, the first field is a PRACH association indicator.

[0017] In a possible design, the first DCI includes: a PDCCH order DCI or a DCI format 1_0 or a PDCCH order; and the PRACH is a PDCCH order PRACH, or a RACH triggered by the PDCCH order.

[0018] In a third aspect, an embodiment of the present application provides a communication method, which can be executed by a terminal device and a functional module or a chip in the terminal device, and is taken as an example that the terminal device executes, and the method includes: receiving a second DCI (DCI, Downlink Control Information), the second DCI is used for a random access process, and the second DCI indicates a first timing advance group (TAG, Timing Advance Group); determining transmission power of a PRACH (PRACH, Physical Random Access Channel) according to the first TAG indicated by the second DCI and a TAG associated with an indicated TCI (Transmission Configuration Indicator) state.

[0019] Based on the method in the third aspect, whether the terminal device applies a PL offset when determining the transmission power of the PRACH is determined by the TAG indicated by the PDCCH-order DCI and the TAG of the indicated TCI state, so that the transmission power of the PRACH is prevented from being too high or too low, and the PRACH efficiency is improved.

[0020] In a possible design, determining the transmission power of the PRACH includes: when the first TAG is the same as the TAG associated with the indicated TCI state, the transmission power of the PRACH is related to a PL offset associated with the indicated TCI state; when the first TAG is different from the TAG associated with the indicated TCI state, the transmission power of the PRACH is not related to the PL offset associated with the indicated TCI state; or

[0021] When the first TAG is the same as the TAG associated with the indicated TCI state, the transmission power of the PRACH is irrelevant to the PL offset associated with the indicated TCI state.

[0022] When the first TAG is different from the TAG associated with the indicated TCI state, the transmission power of the PRACH is relevant to the PL offset associated with the indicated TCI state.

[0023] In a possible design, the second DCI includes a second field, and the second field is used to indicate the first TAG.

[0024] In a possible design, the second field is a PRACH association indicator.

[0025] In a possible design, the second DCI includes: a PDCCH order DCI or a DCI format 1_0 or a PDCCH order; and the PRACH is a PDCCH order PRACH or a PDCCH order triggered RACH.

[0026] In a fourth aspect, an embodiment of the present application provides a communication method, which can be executed by a terminal device and a functional module or a chip in the terminal device, and is taken as an example of being executed by the terminal device, the method includes: sending a second DCI, the second DCI is used for a random access process, and the second DCI indicates a first TAG, and the first TAG indicated by the second DCI is used to determine transmission power of a PRACH.

[0027] Based on the method in the fourth aspect, whether the terminal device applies the PL offset when determining the transmission power of the PRACH is determined by the TAG indicated by the PDCCH-order DCI and the TAG of the indicated TCI state, so that the transmission power of the PRACH is prevented from being too high or too low, and the PRACH efficiency is improved.

[0028] In a possible design, when the first TAG is the same as the TAG associated with the indicated TCI state, the transmission power of the PRACH is relevant to the PL offset associated with the indicated TCI state; and when the first TAG is different from the TAG associated with the indicated TCI state, the transmission power of the PRACH is irrelevant to the PL offset associated with the indicated TCI state.

[0029] When the first TAG is the same as the TAG associated with the indicated TCI state, the transmission power of the PRACH is irrelevant to the PL offset associated with the indicated TCI state; and when the first TAG is different from the TAG associated with the indicated TCI state, the transmission power of the PRACH is relevant to the PL offset associated with the indicated TCI state.

[0030] In a possible design, the second DCI includes a second field, and the second field is used to indicate the first TAG.

[0031] In a possible design, the second field is a PRACH association indicator.

[0032] In a possible design, the second DCI includes: a PDCCH order DCI or a DCI format 1_0 or a PDCCH order; and the PRACH is a PDCCH order PRACH or a PDCCH order triggered RACH.

[0033] In a fifth aspect, an embodiment of the present application provides a communication method, which can be executed by a terminal device and a functional module or a chip in the terminal device, and is taken as an example that the terminal device executes, and the method includes: receiving a third downlink control information (DCI), the third DCI is used for a random access procedure; and determining a transmission power of a physical random access channel (PRACH) according to at least two of the following: a reference signal associated with an indicated transmission configuration indication (TCI) state, a synchronization signal physical broadcast channel (SS / PBCH) indicated by the third DCI, and a reference signal quasi co-located with a demodulation reference signal (DMRS) of the third DCI.

[0034] In a possible design, when the indicated TCI state is not associated with a path loss (PL) offset, the transmission power of the PRACH is irrelevant to the PL offset.

[0035] In a possible design, when the indicated TCI state is associated with a PL offset, determining the transmission power of the PRACH according to at least two of the following: the reference signal associated with the indicated TCI state, the SS / PBCH indicated by the third DCI, and the reference signal quasi co-located with the DMRS of the third DCI includes: determining whether the transmission power of the PRACH is associated with the PL offset associated with the indicated TCI state according to at least two of the following: the reference signal associated with the indicated TCI state, the SS / PBCH indicated by the third DCI, and the reference signal quasi co-located with the DMRS of the third DCI.

[0036] In a possible design, determining whether the transmission power of the PRACH is associated with the PL offset associated with the indicated TCI state according to at least two of the reference signal associated with the indicated TCI state, the SS / PBCH indicated by the third DCI, and the reference signal quasi co-located with the DMRS of the third DCI comprises: when the reference signal associated with the indicated TCI state is consistent with the SS / PBCH indicated by the third DCI, the transmission power of the PRACH is associated with the PL offset associated with the indicated TCI state; when the reference signal associated with the indicated TCI state is inconsistent with the SS / PBCH indicated by the third DCI, the transmission power of the PRACH is not associated with the PL offset associated with the indicated TCI state; or;

[0037] when the reference signal associated with the indicated TCI state is consistent with the SS / PBCH indicated by the third DCI, the transmission power of the PRACH is not associated with the PL offset associated with the indicated TCI state; and when the reference signal associated with the indicated TCI state is inconsistent with the SS / PBCH indicated by the third DCI, the transmission power of the PRACH is associated with the PL offset associated with the indicated TCI state.

[0038] Based on the design, whether the terminal device applies the PL offset is determined based on the SSB indicated by the PDCCH-order DCI and the QCL source of the indicated TCI state, so that whether the terminal device applies the PL offset when determining the PRACH transmission power is implicitly indicated in the asymmetric TRP scenario, and the PRACH efficiency is improved.

[0039] In a possible design, determining whether the transmission power of the PRACH is associated with the PL offset associated with the indicated TCI state according to at least two of the reference signal associated with the indicated TCI state, the SS / PBCH indicated by the third DCI, and the reference signal quasi co-located with the DMRS of the third DCI comprises: when the reference signal associated with the indicated TCI state is consistent with the reference signal quasi co-located with the DMRS of the third DCI, determining that the transmission power of the PRACH is associated with the PL offset associated with the indicated TCI state; when the reference signal associated with the indicated TCI state is inconsistent with the reference signal quasi co-located with the DMRS of the third DCI, determining that the transmission power of the PRACH is not associated with the PL offset associated with the indicated TCI state; or;

[0040] When the reference signal associated with the indicated TCI state is consistent with the reference signal quasi co-located with the DMRS of the third DCI, it is determined that the transmission power of the PRACH is irrelevant to the PL offset associated with the indicated TCI state; when the reference signal associated with the indicated TCI state is inconsistent with the reference signal quasi co-located with the DMRS of the third DCI, it is determined that the transmission power of the PRACH is relevant to the PL offset associated with the indicated TCI state.

[0041] Based on the design, whether the UE applies the PL offset is determined by the QCL source of the DMRS of the PDCCH-order DCI and the QCL source of the indicated TCI state, so as to implicitly indicate whether the UE applies the PL offset when determining the PRACH transmission power in the asymmetric TRP scenario, avoid the power of the PRACH being too high or too low, and improve the PRACH efficiency.

[0042] In a possible design, according to at least two of the reference signal associated with the indicated TCI state, the SS / PBCH indicated by the third DCI, and the reference signal quasi co-located with the DMRS of the third DCI, it is determined whether the transmission power of the PRACH is relevant to the PL offset associated with the indicated TCI state, including: when the SS / PBCH indicated by the third DCI is consistent with the reference signal quasi co-located with the DMRS of the third DCI, it is determined that the transmission power of the PRACH is relevant to the PL offset associated with the indicated TCI state; when the SS / PBCH indicated by the third DCI is inconsistent with the reference signal quasi co-located with the DMRS of the third DCI, it is determined that the transmission power of the PRACH is irrelevant to the PL offset associated with the indicated TCI state; or;

[0043] When the SS / PBCH indicated by the third DCI is consistent with the reference signal quasi co-located with the DMRS of the third DCI, it is determined that the transmission power of the PRACH is irrelevant to the PL offset associated with the indicated TCI state; when the SS / PBCH indicated by the third DCI is inconsistent with the reference signal quasi co-located with the DMRS of the third DCI, it is determined that the transmission power of the PRACH is relevant to the PL offset associated with the indicated TCI state.

[0044] Based on the design, whether the UE applies the PL offset is determined by the QCL source of the DMRS of the PDCCH-order DCI and the SSB indicated by the PDCCH-order DCI, so as to implicitly indicate whether the UE applies the PL offset when determining the PRACH transmission power in the asymmetric TRP scenario, avoid the power of the PRACH being too high or too low, and improve the PRACH efficiency.

[0045] In a possible design, the indicated TCI state associated reference signal is a QCL resource of the indicated TCI state, and the first DCI DMRS quasi co-located reference signal is a QCL resource of the third DCI DMRS.

[0046] In a possible design, the third DCI includes a PDCCH order DCI or a DCI format 1_0 or a PDCCH order, and the PRACH is a PDCCH order PRACH or a PDCCH order triggered RACH.

[0047] In a possible design, when the number of the indicated TCI states is 2, the indicated TCI states include a first indicated TCI state and a second indicated TCI state, and the third DCI is further used to indicate that transmission power of the PRACH is determined according to a reference signal associated with the first indicated TCI state or a reference signal associated with the second indicated TCI state.

[0048] In a possible design, when the number of the indicated TCI states is 2, only one of the indicated TCI states is associated with a PL offset.

[0049] In a sixth aspect, an embodiment of the present application provides a communication method, which can be executed by a network device and a functional module or a chip in the network device, and is taken as an example of being executed by the network device, the method includes: sending a third downlink control information DCI, the third DCI being used for a random access process; and indicating that at least two of a reference signal associated with an indicated transmission configuration indication TCI state, a synchronization signal physical broadcast channel SS / PBCH indicated by the third DCI, and a reference signal quasi co-located with a demodulation reference signal DMRS of the third DCI are used to determine transmission power of a physical random access channel PRACH.

[0050] In a possible design, when the indicated TCI state is not associated with a path loss PL offset, the transmission power of the PRACH is irrelevant to the PL offset.

[0051] In a possible design, when the indicated TCI state is associated with a path loss PL offset, whether the transmission power of the PRACH is relevant to the PL offset associated with the indicated TCI state is determined according to at least two of the reference signal associated with the indicated TCI state, the SS / PBCH indicated by the third DCI, and the reference signal quasi co-located with the DMRS of the third DCI.

[0052] In a possible design, the indicated TCI state associated reference signal is a QCL resource of the indicated TCI state, and the third DCI DMRS quasi co-located reference signal is a QCL resource of the third DCI DMRS.

[0053] In a possible design, the third DCI includes: a PDCCH order DCI or a DCI format 1_0 or a PDCCH order; and the PRACH is a PDCCH order PRACH or a PDCCH order triggered RACH.

[0054] In a possible design, when the number of indicated TCI states is 2, the indicated TCI states include a first indicated TCI state and a second indicated TCI state, and the third DCI is further used to indicate that transmission power of the PRACH is determined according to a reference signal associated with the first indicated TCI state or a reference signal associated with the second indicated TCI state.

[0055] In a possible design, when the number of indicated TCI states is 2, only one of the indicated TCI states is associated with a PL offset.

[0056] In a seventh aspect, the present application provides a communication apparatus, which can be a terminal device or a chip or a system on chip in the terminal device, and can also be a functional module in the terminal device for implementing the method in any possible design of the first aspect or the third aspect or the fifth aspect. The communication apparatus can implement the functions performed by the terminal device in any possible design of the first aspect or the third aspect or the fifth aspect, and the functions can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions. For example, the communication apparatus can include a transceiver unit and a processing unit.

[0057] Specifically, the related description can refer to the first aspect or the third aspect or the fifth aspect, and meanwhile, the execution actions of each unit of the communication apparatus can refer to the first aspect or the third aspect or the fifth aspect, which will not be described herein.

[0058] In an eighth aspect, the present application provides a communication apparatus, which can be a network device or a chip or a system on chip in the network device, and can also be a functional module in the network device for implementing the method in any possible design of the second aspect or the fourth aspect or the sixth aspect. The communication apparatus can implement the functions performed by the terminal device in any possible design of the second aspect or the fourth aspect or the sixth aspect, and the functions can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions. For example, the communication apparatus can include a transceiver unit and a processing unit.

[0059] Specifically, the related description can refer to any possible design of the second aspect or the fourth aspect or the sixth aspect, and the execution actions of each unit of the communication apparatus can refer to any possible design of the second aspect or the fourth aspect or the sixth aspect, which will not be repeated here.

[0060] In a ninth aspect, the present application provides a communication apparatus, which can be a terminal device or a chip or a system on chip in the terminal device. The communication apparatus can implement the functions of the terminal device in the possible designs of the first aspect or the third aspect or the fifth aspect, which can be implemented through hardware.

[0061] In a possible design, the communication apparatus includes a processor and a communication interface. The processor and the communication interface are configured to support the communication apparatus to perform the communication method in any possible design of the first aspect or the third aspect or the fifth aspect.

[0062] In another possible design, the communication apparatus can further include a memory configured to store computer-executed instructions and data necessary for the communication apparatus. When the communication apparatus is running, the processor executes the computer-executed instructions stored in the memory, so that the communication apparatus performs the communication method in any possible design of the first aspect or the third aspect or the fifth aspect.

[0063] In a tenth aspect, the present application provides a communication apparatus, which can be a network device or a chip or a system on chip in the network device. The communication apparatus can implement the functions of the network device in the possible designs of the second aspect or the fourth aspect or the sixth aspect, which can be implemented through hardware.

[0064] In a possible design, the communication apparatus includes a processor and a communication interface. The processor and the communication interface are configured to support the communication apparatus to perform the communication method in any possible design of the second aspect or the fourth aspect or the sixth aspect.

[0065] In another possible design, the communication apparatus can further include a memory configured to store computer-executed instructions and data necessary for the communication apparatus. When the communication apparatus is running, the processor executes the computer-executed instructions stored in the memory, so that the communication apparatus performs the communication method in any possible design of the second aspect or the fourth aspect or the sixth aspect.

[0066] In an eleventh aspect, the present application provides a computer-readable storage medium storing computer instructions, which, when running on a computer, causes the computer to perform the communication method in any possible design of the first aspect to the sixth aspect.

[0067] In a twelfth aspect, the present application provides a computer program product, which comprises computer instructions, when the computer instructions are run on a computer, the computer is caused to execute the communication method in any possible design of the first aspect to the sixth aspect. BRIEF DESCRIPTION OF DRAWINGS

[0068] FIG. 1 is a schematic diagram of a communication scenario provided by an embodiment of the present application;

[0069] FIG. 2 is a schematic diagram of a communication system provided by an embodiment of the present application;

[0070] FIG. 3 is a schematic diagram of a communication method provided by an embodiment of the present application;

[0071] FIG. 4 is a schematic diagram of another communication method provided by an embodiment of the present application;

[0072] FIG. 5 is a schematic diagram of another communication method provided by an embodiment of the present application;

[0073] FIG. 6 is a schematic diagram of a structure of a communication apparatus provided by an embodiment of the present application;

[0074] FIG. 7 is a schematic diagram of a structure of a communication apparatus provided by an embodiment of the present application. DETAILED DESCRIPTION

[0075] Before introducing the embodiments of the present application, some technical terms related to the embodiments of the present application are explained. It should be noted that the following explanations are provided for the purpose of making the embodiments of the present application easier to understand, and should not be regarded as limiting the scope of protection claimed by the embodiments of the present application.

[0076] When a terminal device determines the transmission power of an uplink signal, the terminal device needs to obtain the path loss between the terminal device and a network device. When the network device transmits a downlink reference signal, the terminal device can measure the downlink reference signal to obtain the path loss. In order to improve the uplink coverage of a cellular communication system, an uplink transmission and reception point (TRP) is introduced in the cellular communication system. The terminal device can transmit an uplink signal to the uplink TRP and receive a downlink signal from a downlink (DL) TRP. Different from the previous multi-TRP scenario, the uplink TRP does not have a downlink reference signal for the terminal device to measure the path loss. In this case, the network device can notify or configure the terminal device of a bias PL offset between the uplink path loss and the downlink path loss, that is, the path loss bias PL offset between the terminal device and the uplink TRP and the downlink TRP. When the terminal device transmits an uplink signal to the uplink TRP, the terminal device can apply the path loss bias PL offset. Specifically, the terminal device measures a downlink reference signal to obtain a downlink path loss, and then determines an uplink path loss in combination with the PL offset notified or configured by the network device.

[0077] As to how the network device configures and notifies the terminal device of the PL offset, a feasible method is that the network device configures a TCI state for the terminal device, the TCI state can be associated with the PL offset, and the network device can update the value of the PL offset through MAC CE signaling. When the terminal device performs uplink transmission, the terminal device determines the transmission power of the uplink signal according to the PL offset associated with the TCI state.

[0078] The TCI is configured by the network device for the terminal device through an RRC message, and is referred to as a TCI state in the configuration signaling. After the network device configures the TCI state for the terminal device through the RRC message, the network device can send a medium access control-control element (MAC-CE) to the terminal device. The MAC-CE signaling is used to activate one or more TCI states configured by the network device for the terminal device. Optionally, the network device can further send a DCI to the terminal device. The DCI is used to indicate one or more TCI states activated by the MAC CE. In this paper, the two description methods of TCI-state and TCI state can be replaced with each other.

[0079] The terminal device can apply a path loss offset value PL offset when transmitting PRACH. The transmission power of the PRACH after the terminal device applies the path loss offset value PL offset satisfies the following formula:

[0080] P PRACH,b,f,c (i) = min{P CMAX,f,c (i), P PRACH,target,f,c + PL b,f,c + PL offset}[dBm],

[0081] or

[0082] P PRACH,b,f,c (i) = min{P CMAX,f,c (i), P PRACH,target,f,c + PL b,f,c - PL offset}[dBm].

[0083] The network device can send a PDCCH to the terminal device to trigger the terminal device to perform initial access, and the PDCCH is a DCI format 1_0 of a special format, and the frequency domain resource allocation field (Frequency domain resource assignment field) of the PDCCH is all 1. Generally, the PDCCH is used to trigger the terminal device to perform PDCCH order PRACH transmission when the terminal device is out of uplink synchronization, so that the terminal device re-establishes uplink synchronization with the network device. The DCI format 1_0 triggering the PDCCH order PRACH transmission is also sometimes referred to as PDCCH order DCI or PDCCH order.

[0084] For the multiple TRPs scenario, the PDCCH order DCI from the first TRP can trigger the PDCCH order PRACH transmission for the first TRP, and can also trigger the PDCCH order PRACH transmission for the second TRP. At the same time, because the physical positions of the first TRP and the second TRP are different, the path losses between the terminal device and the first TRP and the second TRP are different, and the terminal device can perform path loss measurement based on the downlink reference signals from different TRPs to determine the appropriate power for transmitting PRACH, so as to avoid the PRACH power being too high or too low, and improve the PRACH efficiency.

[0085] Specifically, in inter-cell multi-TRP scenario, UE will be configured with high layer parameter SSB-MTC-AdditionalPCI, which means the first TRP and the second TRP correspond to different PCIs, and the PDCCH order DCI can inform the terminal device through 1-bit PRACH association indicator that the corresponding PCI of the PDCCH order PRACH transmission triggered by the PDCCH order DCI, so that the UE determines the PRACH transmission power based on the downlink reference signal from different cells.

[0086] In intra-cell multi-TRP scenario, the PDCCH order DCI can inform the terminal device through 1-bit PRACH association indicator to determine the downlink reference signal for the path loss of the PDCCH-order PRACH transmission power triggered by the PDCCH-order DCI. If the value indicated by the PRACH association indicator is 0, the terminal device determines the PRACH transmission power based on the downlink reference signal quasi co-located with the PDCCH-order DMRS. If the value indicated by the PRACH association indicator is 1, the terminal device determines the PRACH transmission power based on the SS / PBCH indicated by the SS / PBCH index field of the PDCCH-order.

[0087] For the Asymmetric DL single TRP / UL multiple TRPs scenario, the PDCCH-order DCI from the DL TRP can trigger the PDCCH-order PRACH transmission for the DL TRP, or trigger the PDCCH-order PRACH transmission for the UL TRP. In this case, the terminal device needs to know the target TRP of the PDCCH-order PRACH transmission triggered by the PDCCH-order DCI, so as to determine whether to determine the PRACH transmission power based on the PL offset associated with the indicated TCI state. However, the prior art cannot be applied in the Asymmetric DL single TRP / UL multiple TRPs scenario, because the UL TRP has no available downlink reference signal.

[0088] A typical system architecture or application scenario of the present application is shown in FIG. 1, in which transmission receiving node 1 (TRP 1) and transmission receiving node 2 (TRP 2) belong to network equipment, and terminal equipment can be user equipment (UE). In the connected state, the UE receives SSB, PDCCH and PDSCH, etc. Downlink data or control channels and synchronization signals from TRP 1, and the UE sends PUSCH and PUCCH, etc. Uplink data or control signals to TRP 2. At the same time, the UE sends SRS to TRP 1 or TRP 2 for functions such as uplink and downlink channel information acquisition and beam management. TRP 1 can be referred to as a DL TRP, and TRP 2 can be referred to as a UL TRP.

[0089] The communication method provided by the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0090] The technical solutions of the embodiments of the present application can be used in various communication systems, which can be a third generation partnership project (3GPP) communication system, for example, a long term evolution (LTE) system, and can also be a fifth generation (5G) mobile communication system, a new radio (NR) system, a beyond 5G (B5G) mobile communication system, a 6th-generation (6G) mobile communication system, a new radio vehicle to everything (NR V2X) system, and can also be applied to a system in which LTE and 5G are hybrid networked, or a device-to-device (D2D) communication system, a machine to machine (M2M) communication system, an Internet of Things (IoT), and other next-generation communication systems, and can also be a non-3GPP communication system, without limitation. The random access preamble sending method provided by the embodiments of the present application will be described below taking the communication system shown in FIG. 2 as an example.

[0091] The technical solutions of the embodiments of the present application can be applied to various communication scenarios, for example, can be applied to one or more of the following communication scenarios: enhanced mobile broadband (eMBB), ultra reliable low latency communication (URLLC), machine type communication (MTC), massive machine type communication (mMTC), D2D, V2X, and IoT, and the like.

[0092] The communication system to which the technical solutions of the embodiments of the present application are applicable can include terminal devices, network devices. It can be understood that the terminal devices and the network devices can communicate directly or through forwarding of other devices, and the embodiments of the present application do not make specific limitations thereon. FIG. 2 is a schematic diagram of a communication system provided by the embodiments of the present application. As shown in FIG. 2, the communication system 20 can include network devices and terminal devices.

[0093] It can be understood that the above-mentioned FIG. 2 is only a schematic diagram and does not constitute a limitation on the applicable scenarios of the technical solutions provided by the present application. It should be understood by those skilled in the art that, in the specific implementation process, the communication system 20 can also include fewer devices than those shown in FIG. 2, or the communication system 20 can also include other devices, and the number of devices in the communication system 20 can also be determined according to specific needs and is not limited. The devices in the system shown in FIG. 2 are described below.

[0094] The terminal equipment can be a user equipment (UE) or a mobile station (MS) or a mobile terminal (MT) or the like, including a handheld device, a vehicle-mounted device, a wearable device or a computing device with wireless communication function. Specifically, the terminal equipment can be a mobile phone, a tablet computer or a computer with wireless transceiver function, and can also be a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in remote medical treatment, a wireless terminal in smart power grid, a wireless terminal in smart city, a smart home, a vehicle-mounted terminal or the like. In the embodiments of the present application, the device for implementing the function of the terminal equipment can be the terminal equipment, or can be a device capable of supporting the terminal equipment to implement the function, such as a chip system (for example, one chip or a processing system composed of multiple chips) or a modem. In the following, the device for implementing the function of the terminal equipment is taken as an example to describe the communication method provided by the embodiments of the present application.

[0095] The network device is mainly used to implement resource scheduling, wireless resource management, wireless access control and other functions of the terminal device, is a device for accessing the terminal device to the wireless network in the radio access network (RAN), and the RAN can be connected with the core network (for example, the core network of LTE, or the core network of 5G, etc.). The network device can be an evolutional Node B (eNB or eNodeB) in LTE, or a base station in a 5G network or a future evolutional public land mobile network (PLMN), or a base station supporting one-way transmission (for example, an uplink only TRP or an asymmetric TRP supporting uplink transmission and not supporting downlink transmission), or a broadband network gateway (BNG), or a convergence switch or a non-3GPP access device; or the network device in the embodiment of the application can also be a wireless controller in a cloud radio access network (CRAN); or a transmission and reception point (TRP), or a device including the TRP, etc., which are not limited in the embodiment of the application. Optionally, the network device in the embodiment of the application can include various forms of base stations, for example: a macro base station, a micro base station (also known as a small station), a relay station, an access point, etc., which are not limited in the embodiment of the application. In the embodiment of the application, the device for implementing the function of the network device can be the network device, or a device capable of supporting the network device to implement the function, for example, a chip system (for example, a chip, or a processing system composed of multiple chips) or a modem. In the following, the device for implementing the function of the network device is taken as an example to describe the communication sending method provided in the embodiment of the application.

[0096] Optionally, each device (for example, the terminal device, the network device) in FIG. 2 can also be referred to as a communication device, which can be a general-purpose device or a special-purpose device, which is not limited in the embodiment of the application.

[0097] Optionally, the related functions of each device in the embodiment of the application can be implemented by one device, or can be implemented by multiple devices together, or can be implemented by one or more functional modules in a device, which are not limited in the embodiment of the application. It can be understood that the above functions can be network elements in a hardware device, or software functions running on a special-purpose hardware, or a combination of hardware and software, or virtualized functions instantiated on a platform (for example, a cloud platform).

[0098] The random access process preamble sending method provided by the embodiments of the present application is described below in combination with the communication system shown in FIG. 2. The actions, terms, etc. involved in the following embodiments can be mutually referred to. The message names or parameter names in the messages exchanged between devices in each embodiment are only an example, and other names can also be used in specific implementation. For example, the "corresponding" in the following embodiments can be replaced by "associated" or the like, and the "sending" in the following embodiments can be replaced by "transmitting" or the like.

[0099] The flowchart of a communication method provided by the embodiments of the present application is shown in FIG. 3, which can include steps S301-S302.

[0100] Step S301: The network device sends a first downlink control information DCI to the terminal device. The first DCI is used for a random access process, and the first DCI indicates whether the transmission power of a physical random access channel PRACH in the random access process is related to the PL offset associated with the indicated TCI state.

[0101] The related introduction of the random access process can be referred to the related description of step S301.

[0102] In the embodiments of the present application, the network device can be a TRP.

[0103] Specifically, the PRACH can be a PDCCH-order PRACH. The PDCCH-order PRACH is a PRACH transmission triggered by the network device through DCI format 1_0, which is used for the terminal device to trigger PRACH transmission when the uplink is out of synchronization, so as to reestablish the uplink synchronization between the terminal device and the network device.

[0104] Specifically, the format of the first DCI can be DCI format 1_0. The DCI format 1_0 triggering the PDCCH-order PRACH transmission can also be referred to as PDCCH-order DCI. For the DCI format 1_0 used to trigger the PDCCH-order PRACH transmission, the difference between it and the DCI format 1_0 for other purposes is that the Frequency domain resource assignment field of it is all 1.

[0105] Specifically, the first DCI can directly indicate whether the transmission power of the PRACH of the terminal device is related to the PL offset associated with the indicated TCI state, that is, the first DCI can directly indicate whether the terminal device applies the PL offset associated with the indicated TCI state when determining the PRACH power.

[0106] The first DCI can comprise a first field, the first field being used to indicate whether the transmission power of the PRACH of the terminal device is associated with the PL offset associated with the indicated TCI state. The embodiment can multiplex the existing PRACH association indicator to perform the above indication.

[0107] Step S302: determining the transmission power of the PRACH according to the first DCI.

[0108] The indicated TCI state can be associated with a path loss offset (PL offset, or path loss offset value). When the indicated TCI state is associated with the PL offset, the terminal device can determine whether to apply the PL offset when determining the transmission power of the PRACH. When the indicated TCI state is not associated with the PL offset, the transmission power of the PRACH does not apply the PL offset.

[0109] Specifically, when the value of the first field of the first DCI is a first value (for example, the first value is 0), the transmission power of the PRACH is associated with the PL offset associated with the indicated TCI state, that is, the terminal device applies the PL offset associated with the indicated TCI state when determining the transmission power of the PRACH, or the terminal device determines the transmission power of the PRACH according to the PL offset associated with the indicated TCI state; when the value of the first field of the first DCI is a second value (for example, the second value is 1), the transmission power of the PRACH is not associated with the PL offset associated with the indicated TCI state, that is, the terminal device does not apply or ignores the PL offset associated with the indicated TCI state when determining the transmission power of the PRACH.

[0110] Alternatively, the method can also be modified as follows: when the value of the first field of the first DCI is a first value (for example, the first value is 0), the transmission power of the PRACH is not associated with the PL offset associated with the indicated TCI state, that is, the terminal device does not apply or ignores the PL offset associated with the indicated TCI state when determining the transmission power of the PRACH; when the value of the first field of the first DCI is a second value (for example, the second value is 1), the transmission power of the PRACH is associated with the PL offset associated with the indicated TCI state, that is, the terminal device applies the PL offset associated with the indicated TCI state when determining the transmission power of the PRACH, or the terminal device determines the transmission power of the PRACH according to the PL offset associated with the indicated TCI state.

[0111] In this embodiment, whether the terminal device applies the PL offset when determining the PRACH transmission power is directly indicated by the PDCCH-order DCI, so as to avoid that the power of the PRACH transmission is too high or too low, and improve the PRACH efficiency.

[0112] When the number of the indicated TCI states is 2, for example, the indicated TCI states include a first indicated TCI state and a second indicated TCI state, the first DCI is further used for indicating that the transmission power of the PRACH is determined according to the reference signal associated with the first indicated TCI state or the reference signal associated with the second indicated TCI state.

[0113] Specifically, the specific indicated TCI state according to which the transmission power of the PRACH is determined can be indicated by the existing field PRACH association indicator in the PDCCH-order DCI. Specifically, when the value of the PRACH association indicator is 0, the indicated TCI state in the above method can be replaced by the first indicated TCI state, and when the value of the PRACH association indicator is 1, the indicated TCI state in the above method can be replaced by the second indicated TCI state; or, when the value of the PRACH association indicator is 1, the indicated TCI state in the above method can be replaced by the first indicated TCI state, and when the value of the PRACH association indicator is 0, the indicated TCI state in the above method can be replaced by the second indicated TCI state. The above PRACH association indicator can also be replaced by other fields in the PDCCH-order DCI.

[0114] In some embodiments, in the case that the terminal device is configured with two indicated TCI states, the terminal device only expects that one of the two indicated TCI states is associated with the PL offset, or the terminal device only expects that the PL offset associated with one of the two indicated TCI states is not 0, and the indicated TCI state in the above method can be understood as the indicated TCI state associated with the PL offset or the indicated TCI state associated with the PL offset not being 0. Or, when the number of the indicated TCI states is 2, only one of the indicated TCI states is associated with the PL offset, or only one of the indicated TCI states is associated with the PL offset not being 0.

[0115] The TCI state and the TCI state in the present application can be replaced with each other; the indicated TCI state and the indicated TCI state or the indicated TCI state can be replaced with each other.

[0116] Another flowchart of a communication method provided by the embodiment of the present application is shown in FIG. 4, which can include steps S401-S402.

[0117] Step S401: The network device sends a second downlink control information DCI to the terminal device, the second DCI is used for a random access procedure, and the second DCI indicates a first timing advance group TAG.

[0118] The related introduction of the random access procedure can refer to the related description of step S301.

[0119] In the embodiment of the present application, the network device can be a TRP.

[0120] Specifically, the PRACH can be a PDCCH-order PRACH. The PDCCH-order PRACH is a PRACH transmission triggered by the network device through the DCI format 1_0, which is used for the terminal device to trigger the PRACH transmission when the uplink is out of synchronization, so as to reestablish the uplink synchronization between the terminal device and the network device.

[0121] Specifically, the format of the second DCI can be DCI format 1_0. The DCI format 1_0 triggering the PDCCH-order PRACH transmission can also be called PDCCH-order DCI. For the DCI format 1_0 used to trigger the PDCCH-order PRACH transmission, the difference between it and the DCI format 1_0 used for other purposes is that the field Frequency domain resource assignment field of the DCI format 1_0 is all 1.

[0122] Specifically, when the second DCI is the PDCCH-order DCI, the existing field PRACH association indicator in the PDCCH-order DCI can be used to indicate the TAG, or other fields can be added in the PDCCH-order to indicate the TAG.

[0123] Step S402: According to the first TAG indicated by the second DCI and the TAG associated with the indicated transmission configuration indication TCI state, the transmission power of the PRACH is determined.

[0124] The description of the indicated TCI state association can refer to the description in step 302, which will not be repeated here.

[0125] The following takes the second DCI as an example to introduce the PDCCH-order DCI.

[0126] The TAG associated with the indicated TCI state can be understood as the tag-Id-ptr field in the information elements CandidateTCI-State, CandidateTCI-UL-State, TCI-State, and TCI-UL-State. The value n0 represents that the TCI state is associated with the TAG indicated by the tag-Id field, and the value n1 represents that the TCI state is associated with the TAG indicated by the tag2-Id field.

[0127] The field tag-Id-ptr can also be replaced by the field tag-Id-ptr-r18.

[0128] The indicated TCI state can be associated with a path loss offset PL offset (or path loss offset value). When the indicated TCI state is associated with a PL offset, the terminal device can determine whether to apply the PL offset when determining the transmission power of the PRACH. When the indicated TCI state is not associated with a PL offset, the transmission power of the PRACH does not apply the PL offset.

[0129] When the indicated TCI state is associated with a PL offset, or the PL offset associated with the indicated TCI state is not 0, if the first TAG indicated by the PDCCH-order DCI is the same as the TAG associated with the indicated TCI state, the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state, that is, the terminal device applies the PL offset associated with the indicated TCI state when determining the transmission power of the PRACH, or the terminal device determines the transmission power of the PRACH according to the PL offset associated with the indicated TCI state; if the first TAG indicated by the PDCCH-order DCI is not the same as the TAG associated with the indicated TCI state, the transmission power of the PRACH is not related to the PL offset associated with the indicated TCI state, that is, the terminal device does not apply or ignores the PL offset associated with the indicated TCI state when determining the transmission power of the PRACH.

[0130] Or the method can also be modified as follows: if the first TAG indicated by the PDCCH-order DCI and the TAG associated with the indicated TCI state are different, the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state, that is, the terminal device determines the PRACH transmission power by applying the PL offset associated with the indicated TCI state, or the terminal device determines the PRACH transmission power according to the PL offset associated with the indicated TCI state; if the first TAG indicated by the PDCCH-order DCI and the TAG associated with the indicated TCI state are the same, the transmission power of the PRACH is irrelevant to the PL offset associated with the indicated TCI state, that is, the terminal device determines the PRACH transmission power without applying or ignoring the PL offset associated with the indicated TCI state.

[0131] The PDCCH-order DCI described in the embodiment can indicate the first TAG through a second field. When the value of the second field is 0, the first TAG indicated by the second field is the TAG indicated by the higher-layer field tag-Id; when the value of the second field is 1, the first TAG indicated by the second field is the TAG indicated by the higher-layer field tag2-Id. Alternatively, when the value of the second field is 0, the first TAG indicated by the second field is the TAG indicated by the higher-layer field tag2-Id; when the value of the second field is 1, the first TAG indicated by the second field is the TAG indicated by the higher-layer field tag-Id.

[0132] The second field of the PDCCH-order DCI described in the embodiment can be a PRACH association indicator, or other newly added fields.

[0133] In the embodiment, whether the terminal device applies the PL offset when determining the PRACH transmission power is determined by the TAG indicated by the PDCCH-order DCI and the TAG of the indicated TCI state, so as to avoid excessively high or low power of the PRACH transmission and improve the PRACH efficiency.

[0134] When the number of the indicated TCI states is 2, for example, the indicated TCI states include a first indicated TCI state and a second indicated TCI state, the first DCI is further used to indicate that the PRACH transmission power is determined according to the reference signal associated with the first indicated TCI or according to the reference signal associated with the second indicated TCI.

[0135] Specifically, the transmission power of the PRACH can be determined according to the TCI state indicated by the PRACH association indicator in the PDCCH-order DCI. Specifically, when the value of the PRACH association indicator is 0, the indicated TCI state in the above method can be replaced by the first indicated TCI state, and when the value of the PRACH association indicator is 1, the indicated TCI state in the above method can be replaced by the second indicated TCI state. Alternatively, when the value of the PRACH association indicator is 1, the indicated TCI state in the above method can be replaced by the first indicated TCI state, and when the value of the PRACH association indicator is 0, the indicated TCI state in the above method can be replaced by the second indicated TCI state. The PRACH association indicator can also be replaced by other fields in the PDCCH-order DCI.

[0136] In some embodiments, when the terminal device is configured with two indicated TCI states, the terminal device only expects one of the two indicated TCI states to be associated with a PL offset, or the terminal device only expects one of the two indicated TCI states to be associated with a PL offset that is not 0. The indicated TCI state in the above method can be understood as the indicated TCI state associated with the PL offset or the indicated TCI state associated with the PL offset that is not 0. Alternatively, when the number of indicated TCI states is 2, only one of the indicated TCI states is associated with a PL offset, or only one of the indicated TCI states is associated with a PL offset that is not 0.

[0137] The flowchart of the communication method provided by the embodiments of the present application is shown in FIG. 5, which can include steps S501-S502:

[0138] Step S501: The network device sends a third downlink control information DCI to the terminal device, and the third DCI is used for a random access procedure.

[0139] Specifically, the third DCI can be used to trigger the terminal device to perform a random access procedure RACH, and the random access procedure includes the terminal device sending a physical random access channel PRACH to the network device.

[0140] In the embodiments of the present application, the network device can be a TRP.

[0141] Specifically, the PRACH can be a PDCCH order PRACH. The PDCCH order PRACH is a PRACH transmission triggered by a network device through a DCI format 1_0, which is used for a terminal device to trigger a PRACH transmission when the terminal device is out of synchronization in uplink, so as to make the terminal device and the network device reestablish uplink synchronization.

[0142] Specifically, the format of the third DCI can be a DCI format 1_0. The DCI format 1_0 triggering the PDCCH order PRACH transmission can also be referred to as a PDCCH order DCI or a PDCCH order. For the DCI format 1_0 used to trigger the PDCCH order PRACH transmission, it is distinguished from the DCI format 1_0 used for other purposes in that the field Frequency domain resource assignment field of the DCI format 1_0 is all 1.

[0143] Step S502: Determine the transmission power of the physical random access channel (PRACH) according to at least two of the reference signals associated with the indicated transmission configuration indication (TCI) state, the synchronization signal physical broadcast channel (SS / PBCH) indicated by the third DCI, and the reference signal quasi co-located with the demodulation reference signal (DMRS) of the third DCI.

[0144] The following takes the third DCI as the PDCCH order DCI as an example.

[0145] Specifically, the PDCCH order DCI can indicate a synchronization signal block (SSB) in the field SS / PBCH index field. The synchronization signal physical broadcast channel (SS / PBCH) indicated by the third DCI can also be understood as the synchronization signal (SS) indicated by the third DCI.

[0146] Specifically, the reference signal quasi co-located with the DMRS of the PDCCH order DCI can be understood as the QCL resource of the DMRS of the PDCCH order DCI. The reference signal quasi co-located with the DMRS of the PDCCH order DCI can also be understood as the reference signal quasi co-located with the DMRS of the PDCCH, or the reference signal quasi co-located with the DMRS of the PDCCH order.

[0147] Specifically, the terminal device can obtain the indicated TCI state through the received other DCI or other downlink signal before receiving the third DCI. The reference signal associated with the indicated TCI state can be understood as the QCL resource of the indicated TCI state, or the reference signal indicated by the referenceSignal field under the QCL-Info of the TCI-State field of the high-layer signaling accepted by the terminal device, or the reference signal indicated by the referenceSignal-r17 field under the TCI-UL-State field of the high-layer signaling accepted by the terminal device, or the reference signal indicated by the referenceSignal-r18 field under the CandidateTCI-UL-State field of the high-layer signaling accepted by the terminal device, or the reference signal indicated by the referenceSignal-r18 field under the CandidateTCI-State field of the high-layer signaling accepted by the terminal device.

[0148] The indicated TCI state described above can be associated with a path loss offset PL offset (or referred to as a path loss offset value).

[0149] When the indicated TCI state is not associated with the PL offset, the PL offset is not applied to the transmission power of the PRACH, or the terminal device can determine that the PL offset will not be applied to the transmission power of the PRACH.

[0150] When the indicated TCI state is associated with the PL offset, or the PL offset associated with the indicated TCI state is not 0, the terminal device can determine whether the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state according to at least two of the reference signal associated with the indicated TCI state, the SS / PBCH indicated by the third DCI, and the reference signal quasi co-located with the DMRS of the third DCI. Wherein, determining whether the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state can also be understood as whether to apply the PL offset associated with the indicated TCI state when determining the transmission power of the PRACH, or whether to determine the transmission power of the PRACH according to the PL offset associated with the indicated TCI state.

[0151] In some embodiments, the number of indicated TCI states can be 1 or 2.

[0152] The following introduces three methods for determining the PRACH transmission power when the number of indicated TCI states is 1 and the indicated TCI state is associated with the PL offset.

[0153] When the reference signal associated with the indicated TCI state is consistent with the SS / PBCH indicated by the third DCI, the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state; when the reference signal associated with the indicated TCI state is inconsistent with the SS / PBCH indicated by the third DCI, the transmission power of the PRACH is irrelevant to the PL offset associated with the indicated TCI state.

[0154] Alternatively, the method can also be modified as follows: when the reference signal associated with the indicated TCI state is consistent with the SS / PBCH indicated by the third DCI, the transmission power of the PRACH is irrelevant to the PL offset associated with the indicated TCI state; when the reference signal associated with the indicated TCI state is inconsistent with the SS / PBCH indicated by the third DCI, the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state.

[0155] In this implementation, the SSB indicated by the PDCCH-order DCI and the QCL source of the indicated TCI state jointly determine whether the terminal device applies the PL offset, thereby implicitly indicating whether the terminal device applies the PL offset when determining the PRACH transmission power in the asymmetric TRP scenario, avoiding that the power of the PRACH is too high or too low, and improving the PRACH efficiency.

[0156] When the reference signal associated with the indicated TCI state is consistent with the reference signal quasi-co-located with the DMRS of the third DCI, it is determined that the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state; when the reference signal associated with the indicated TCI state is inconsistent with the reference signal quasi-co-located with the DMRS of the third DCI, it is determined that the transmission power of the PRACH is irrelevant to the PL offset associated with the indicated TCI state.

[0157] Alternatively, the method can also be modified as follows: when the reference signal associated with the indicated TCI state is consistent with the reference signal quasi-co-located with the DMRS of the third DCI, it is determined that the transmission power of the PRACH is irrelevant to the PL offset associated with the indicated TCI state; when the reference signal associated with the indicated TCI state is inconsistent with the reference signal quasi-co-located with the DMRS of the third DCI, it is determined that the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state.

[0158] In this implementation, the QCL source of the DMRS of the PDCCH-order DCI and the QCL source of the indicated TCI state jointly determine whether the UE applies the PL offset, thereby implicitly indicating whether the UE applies the PL offset when determining the PRACH transmission power in the asymmetric TRP scenario, avoiding excessively high or low power for transmitting the PRACH, and improving PRACH efficiency.

[0159] When the third DCI indicates that the SS / PBCH is consistent with the reference signal quasi-co-located with the DMRS of the third DCI, the transmission power of the PRACH is determined in association with the PL offset associated with the indicated TCI state; when the third DCI indicates that the SS / PBCH is inconsistent with the reference signal quasi-co-located with the DMRS of the third DCI, the transmission power of the PRACH is determined regardless of the PL offset associated with the indicated TCI state.

[0160] Alternatively, the method can also be modified as follows: when the third DCI indicates that the SS / PBCH is consistent with the reference signal quasi-co-located with the DMRS of the third DCI, the transmission power of the PRACH is determined regardless of the PL offset associated with the indicated TCI state; when the third DCI indicates that the SS / PBCH is inconsistent with the reference signal quasi-co-located with the DMRS of the third DCI, the transmission power of the PRACH is determined in association with the PL offset associated with the indicated TCI state.

[0161] In this implementation, the QCL source of the DMRS of the PDCCH-order DCI and the SSB indicated by the PDCCH-order DCI jointly determine whether the UE applies the PL offset, thereby implicitly indicating whether the UE applies the PL offset when determining the PRACH transmission power in the asymmetric TRP scenario, avoiding excessively high or low power for transmitting the PRACH, and improving PRACH efficiency.

[0162] In the above three implementations, the terminal device determines whether to apply the PL offset when determining the PRACH transmission power in the asymmetric TRP scenario according to at least two of the indicated transmission configuration indication TCI state quasi-co-location QCL resource, the synchronization signal block SSB indicated by the third DCI, and the QCL resource of the demodulation reference signal DMRS associated with the third DCI, thereby avoiding excessively high or low power for transmitting the PRACH, and improving PRACH efficiency.

[0163] When the number of indicated TCI states is 2, such as the indicated TCI states include a first indicated TCI state and a second indicated TCI state, the third DCI is further used to indicate to determine the transmission power of the PRACH according to the reference signal associated with the first indicated TCI state or the reference signal associated with the second indicated TCI state.

[0164] Specifically, the specific indicated TCI state according to which the transmission power of the PRACH is determined can be indicated by the existing field PRACH association indicator in the PDCCH-order DCI. Specifically, when the value of the PRACH association indicator is 0, the indicated TCI state in the above three methods can be replaced by the first indicated TCI state, and when the value of the PRACH association indicator is 1, the indicated TCI state in the above three methods can be replaced by the second indicated TCI state; or, when the value of the PRACH association indicator is 1, the indicated TCI state in the above three methods can be replaced by the first indicated TCI state, and when the value of the PRACH association indicator is 0, the indicated TCI state in the above three methods can be replaced by the second indicated TCI state. The above PRACH association indicator can also be replaced by other fields in the PDCCH-order DCI.

[0165] In some embodiments, in the case where the terminal device is configured with two indicated TCI states, the terminal device only expects one of the two indicated TCI states to be associated with a PL offset, or the terminal device only expects one of the two indicated TCI states to be associated with a PL offset that is not 0, and the indicated TCI state in the above three methods can be understood as the indicated TCI state associated with the PL offset or the indicated TCI state associated with the PL offset that is not 0. Or, when the number of indicated TCI states is 2, only one of the indicated TCI states is associated with a PL offset, or only one of the indicated TCI states is associated with a PL offset that is not 0.

[0166] It should be appreciated that each device, for example, a network device (such as a conventional base station), a terminal device, and the like, in order to implement the above functions, contains a hardware structure and / or software module for executing each function. Those skilled in the art should easily realize that, in combination with the algorithm steps of each example described in the embodiments disclosed herein, the present application can be realized in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0167] The embodiments of the present application can group the functional modules of the network device, terminal device, and the like according to the above method examples. For example, each functional module can be grouped according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be realized in the form of hardware or software functional module. It should be noted that the grouping of modules in the embodiments of the present application is illustrative, and is only a logical grouping. There can be another grouping manner in actual implementation.

[0168] FIG. 6 shows a structure diagram of a communication apparatus 700, which can be used to execute the functions of the terminal device involved in the above embodiments. As a realizable manner, the communication apparatus 700 shown in FIG. 6 includes a processing unit 7001, a transceiver unit 7002;

[0169] The processing unit 7001 can support the communication apparatus 700 to execute S301 or S401 or S501.

[0170] The transceiver unit 7002 can be used to support the communication apparatus 700 to execute S302 and S402 or S502.

[0171] As a further implementation manner, the communication apparatus 700 shown in FIG. 6 includes a processing module and a communication module. The processing module is configured to control and manage the actions of the communication apparatus 700, for example, the processing module can integrate the functions of the processing unit 7001, and can be configured to support the communication apparatus 700 to perform S301-S302 or perform S401-S402 or perform S501-S502 and other processes of the technologies described herein. The communication module can integrate the functions of the transceiver unit 7002, and can be configured to support the communication apparatus 700 to perform S301-S302 or perform S401-S402 or perform S501-S502 and communication with other network entities, for example, communication with the functional modules or network entities shown in FIG. 4. The communication apparatus 700 can further include a storage module configured to store program codes and data of the communication apparatus 700.

[0172] It is mentioned above that the processing module can be a processor or a controller. The processor or the controller can implement or execute the various exemplary logical blocks, modules, and circuits described in connection with the disclosure. The processor can also be a combination of implementing computing functions, such as one or more microprocessors, a combination of DSP and microprocessor, and the like. The communication module can be a transceiver circuit or a communication interface, and the like. The storage module can be a memory. When the processing module is a processor, the communication module is a communication interface, and the storage module is a memory, the communication apparatus 700 involved in the embodiments of the present application can be a communication apparatus 900 shown in FIG. 7. For example, the terminal device and the network device mentioned above can adopt the component structure shown in FIG. 7 or include the components shown in FIG. 7. FIG. 7 is a component structure diagram of a communication apparatus 900 according to an embodiment of the present application. As shown in FIG. 7, the communication apparatus 900 can include a processor 9001, a communication line 9002, and a communication interface 9003.

[0173] Further, the communication apparatus 900 can further include a memory 9004. The processor 9001, the memory 9004, and the communication interface 9003 can be connected through the communication line 9002.

[0174] The processor 9001 can be a central processing unit (CPU), a general processor network processor (NP), a digital signal processing (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 9001 can also be other communication apparatuses with processing functions, such as circuits, devices, or software modules, and the like.

[0175] A communication line 9002 is configured to transmit information between components included in the communication device 900.

[0176] A communication interface 9003 is configured to communicate with other devices or other communication networks. The other communication networks can be an Ethernet, a radio access network (RAN), a wireless local area network (WLAN), or the like. The communication interface 9003 can be a radio frequency module, a transceiver, or any communication device capable of communication. Embodiments of the present application take the communication interface 9003 as a radio frequency module for example. The radio frequency module can include an antenna, a radio frequency circuit, and the like. The radio frequency circuit can include a radio frequency integrated chip, a power amplifier, and the like.

[0177] A memory 9004 is configured to store instructions. The instructions can be a computer program.

[0178] The memory 9004 can be a read-only memory (ROM) or other types of static storage devices that can store static information and / or instructions, or can be a random access memory (RAM) or other types of dynamic storage device that can store information and / or instructions, or can be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, a magneto-optical disk, a magnetic disk storage medium, or other magnetic storage device, or other optical disk storage, a magneto-optical disk, a magnetic disk storage medium, or other magnetic storage device.

[0179] It should be noted that the memory 9004 can exist independently of the processor 9001, or can be integrated with the processor 9001. The memory 9004 can be configured to store instructions or program codes or some data, and the like. The memory 9004 can be located in the communication device 900, or can be located outside the communication device 900, without limitation. The processor 9001 is configured to execute the instructions stored in the memory 9004, to implement the random access process preamble sending method provided by the embodiments described below.

[0180] In an example, the processor 9001 can include one or more CPUs, such as CPU0 and CPU1 in FIG. 7.

[0181] As an optional implementation, the communication apparatus 900 comprises a plurality of processors, for example, in addition to the processor 9001 in FIG. 7, the processor 9007 can also be included.

[0182] As an optional implementation, the communication apparatus 900 further comprises an output device 9005 and an input device 9006. The input device 9006 is a keyboard, a mouse, a microphone, or a joystick, etc., and the output device 9005 is a display screen, a speaker, or the like.

[0183] It should be noted that the communication apparatus 900 can be a desktop computer, a laptop computer, a network server, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system, or a device having a similar structure as shown in FIG. 7. In addition, the constituent structure shown in FIG. 7 does not constitute a limitation on the communication apparatus, and the communication apparatus can comprise more or fewer components than those shown in the figure, or combine certain components, or different component arrangements, in addition to the components shown in FIG. 7.

[0184] In the embodiments of the present application, the chip system can be composed of a chip, or can comprise a chip and other discrete devices.

[0185] The embodiments of the present application also provide a computer readable storage medium. All or part of the processes of the above method embodiments can be instructed by a computer program to relevant hardware, and the program can be stored in the above computer readable storage medium. When the program is executed, the processes of the above method embodiments can be included. The computer readable storage medium can be the terminal device of any of the preceding embodiments, such as an internal storage unit including a data transmission end and / or a data receiving end, for example, a hard disk or a memory of the terminal device. The above computer readable storage medium can also be an external storage device of the terminal device, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the terminal device. Further, the above computer readable storage medium can include both the internal storage unit and the external storage device of the terminal device. The above computer readable storage medium is used to store the above computer program and other programs and data required by the terminal device. The above computer readable storage medium can also be used to temporarily store data that has been output or will be output.

[0186] It should be understood that in the technical solutions of the present application, the collection, storage, use, processing, transmission, provision and disclosure of user personal information are in line with relevant legal provisions and do not violate public order and good customs. For example, the processing of user personal information in the technical solutions of the present application is carried out with the authorization of the user, and the same description is not repeated here.

[0187] It should be noted that the terms "first" and "second" and the like in the description, claims and drawings of the application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprises", "comprising", "includes", "including" and the like are to be construed open-ended, allowing for instances where there are equivalents to the elements listed thereafter. For example, a process, method, article, or apparatus that "comprises" or "comprising" a list of steps or elements is not necessarily limited to only those steps or elements but can include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Similarly, a step or element that "comprises" or "comprising" one or more features, refers to combinations including individual features, combinations including only a single feature, and combinations including more than one feature.

[0188] It should be understood that, in the present application, "at least one" refers to one or more, "multiple" refers to two or more, "at least two" refers to two or three and more, and "and / or" is used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, "A and / or B" can mean that there are only A, only B, and A and B at the same time, where A and B can be singular or plural. The character " / " generally represents that the front and rear associated objects are in an "or" relationship. "At least one of the following" or the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b or c can mean a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0189] It should be understood that, in the embodiments of the present application, "B corresponding to A" means that B is associated with A. For example, B can be determined according to A. It should also be understood that determining B according to A does not mean that B is determined only according to A, but B can also be determined according to A and / or other information. In addition, "connection" appearing in the embodiments of the present application means direct connection or indirect connection and various connection modes to achieve communication between devices, which is not limited by the embodiments of the present application.

[0190] The "transmit" and "transmission" appearing in the embodiments of the present application mean bidirectional transmission, including sending and / or receiving actions, unless otherwise specified. Specifically, "transmit" in the embodiments of the present application includes data sending, data receiving, or data sending and data receiving. Or, the data transmission here includes uplink and / or downlink data transmission. The data can include channels and / or signals, and the uplink data transmission is uplink channel and / or uplink signal transmission, and the downlink data transmission is downlink channel and / or downlink signal transmission. "Network" and "system" appearing in the embodiments of the present application express the same concept, and the communication system is a communication network.

[0191] Those skilled in the art can clearly understand the communication device and method disclosed in the above embodiments, for the convenience and brevity of description, only the grouping of the above functional modules is exemplified, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is grouped into different functional modules to complete all or part of the functions described above.

[0192] In several embodiments provided in the present application, it should be understood that the disclosed communication device and method can be implemented in other ways. For example, the above-described communication device embodiments are only illustrative, for example, the grouping of the modules or units is only a logical function grouping, and actual implementation can have another grouping manner, for example, a plurality of units or components can be combined or integrated into another device, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed units can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0193] The units described as separate components can or can not be physically separated, and the components displayed as units can be one physical unit or multiple physical units, that is, they can be located in one place or distributed to multiple different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0194] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0195] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application essentially or say the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium, including a plurality of instructions for causing an apparatus, such as a single-chip microcomputer, a chip, or a processor, to execute all or part of the steps of the method described in the embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk or an optical disk, and various storage program codes.

[0196] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any changes or replacements that are easily thought of by those skilled in the art within the technical scope of the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A communication method characterized by comprising: Comprising: receiving a first downlink control information (DCI) for a random access procedure, the first DCI indicating whether a transmission power of a physical random access channel (PRACH) in the random access procedure is associated with a PL offset associated with an indicated TCI state; determining the transmission power of the PRACH according to the first DCI.

2. The method of claim 1, wherein, the first DCI comprises a first field; determining the transmission power of the PRACH according to the first DCI comprises: when the first field of the first DCI is a first value, the transmission power of the PRACH is associated with the PL offset associated with the indicated TCI state; when the first field of the first DCI is a second value, the transmission power of the PRACH is not associated with the PL offset associated with the indicated TCI state; or, when the first field of the first DCI is a first value, the transmission power of the PRACH is not associated with the PL offset associated with the indicated TCI state; when the first field of the first DCI is a second value, the transmission power of the PRACH is associated with the PL offset associated with the indicated TCI state.

3. The method according to claim 1 or 2, characterized in that, the first field is a PRACH association indicator.

4. A communication method characterized by comprising: Comprising: transmitting a first downlink control information (DCI) for a random access procedure, the first DCI indicating whether a transmission power of a physical random access channel (PRACH) in the random access procedure is associated with a PL offset associated with an indicated TCI state, the first DCI being used for determining the transmission power of the PRACH.

5. The method of claim 4, wherein, the first DCI comprises a first field; when the first field of the first DCI is a first value, the transmission power of the PRACH is associated with the PL offset associated with the indicated TCI state; when the first field of the first DCI is a second value, the transmission power of the PRACH is not associated with the PL offset associated with the indicated TCI state; or, when the first field of the first DCI is a first value, the transmission power of the PRACH is not associated with the PL offset associated with the indicated TCI state; when the first field of the first DCI is a second value, the transmission power of the PRACH is associated with the PL offset associated with the indicated TCI state.

6. The method according to claim 4 or 5, characterized in that, the first field is a PRACH association indicator.

7. The method according to any one of claims 1 to 6, characterized in that, the first DCI comprises a PDCCH order DCI or a DCI format 1_0 or a PDCCH order; the PRACH is a PDCCH order PRACH, or a PDCCH order triggered RACH.

8. A communication method characterized by comprising: Comprising: receiving a second downlink control information (DCI) for a random access procedure, the second DCI indicating a first timing advance group (TAG); determining a transmission power of the PRACH according to a first TAG indicated by the second DCI and a TAG associated with an indicated transmission configuration indication (TCI) state. the first DCI comprises a first field; determining the transmission power of the PRACH according to the first DCI comprises: when the first field of the first DCI is a first value, the transmission power of the PRACH is associated with the PL offset associated with the indicated TCI state; when the first field of the first DCI is a second value, the transmission power of the PRACH is not associated with the PL offset associated with the indicated TCI state; or, when the first field of the first DCI is a first value, the transmission power of the PRACH is not associated with the PL offset associated with the indicated TCI state; when the first field of the first DCI is a second value, the transmission power of the PRACH is associated with the PL offset associated with the indicated TCI state. the first field is a PRACH association indicator.

9. The method of claim 8, wherein, determining the transmission power of the PRACH comprises: when the first TAG is the same as the TAG associated with the indicated TCI state, the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state; when the first TAG is different from the TAG associated with the indicated TCI state, the transmission power of the PRACH is not related to the PL bias associated with the indicated TCI state; or, when the first TAG is the same as the TAG associated with the indicated TCI state, the transmission power of the PRACH is not related to the PL bias associated with the indicated TCI state; when the first TAG is different from the TAG associated with the indicated TCI state, the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state.

10. The method according to claim 8 or 9, characterized in that, the second DCI comprises a second field for indicating the first TAG.

11. The method of claim 10, wherein, the second field is a PRACH association indicator.

12. A communication method, comprising: comprising: transmitting a second downlink control information DCI, the second DCI being for a random access procedure, the second DCI indicating a first timing advance group TAG, the first TAG indicated by the second DCI being used for determining a transmission power of the PRACH.

13. The method of claim 12, wherein, when the first TAG is the same as the TAG associated with the indicated TCI state, the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state; when the first TAG is different from the TAG associated with the indicated TCI state, the transmission power of the PRACH is not related to the PL bias associated with the indicated TCI state; or, when the first TAG is the same as the TAG associated with the indicated TCI state, the transmission power of the PRACH is not related to the PL bias associated with the indicated TCI state; when the first TAG is different from the TAG associated with the indicated TCI state, the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state.

14. The method according to claim 12 or 13, characterized in that, the second DCI comprises a second field for indicating the first TAG.

15. The method of claim 14, wherein, the second field is a PRACH association indicator.

16. The method according to any one of claims 8-15, characterized in that, the second DCI comprises a PDCCH order DCI or a DCI format 1_0 or a PDCCH order; the PRACH is a PDCCH order PRACH or a PDCCH order triggered RACH.

17. A method of communication, comprising: comprising: receiving a third downlink control information DCI, the third DCI being for a random access procedure; determining a transmission power of a physical random access channel PRACH according to at least two of a reference signal associated with an indicated transmission configuration indication TCI state, a synchronization signal physical broadcast channel SS / PBCH indicated by the third DCI, and a reference signal quasi co-located with a demodulation reference signal DMRS of the third DCI.

18. The method of claims 1, 4, 8, 12, or 17, wherein, When the indicated TCI state is not associated with a path loss, PL, offset, the transmission power of the PRACH is independent of the PL offset.

19. The method of claim 17, wherein, When the indicated TCI state is associated with a path loss, PL, offset, determining the transmission power of the PRACH from at least two of the reference signal associated with the indicated TCI state, the SS / PBCH indicated by the third DCI, and the reference signal quasi co-located with the DMRS of the third DCI comprises: determining whether the transmission power of the PRACH is dependent on the PL offset associated with the indicated TCI state from at least two of the reference signal associated with the indicated TCI state, the SS / PBCH indicated by the third DCI, and the reference signal quasi co-located with the DMRS of the third DCI.

20. The method of claim 19, wherein, determining whether the transmission power of the PRACH is dependent on the PL offset associated with the indicated TCI state from at least two of the reference signal associated with the indicated TCI state, the SS / PBCH indicated by the third DCI, and the reference signal quasi co-located with the DMRS of the third DCI comprises: when the reference signal associated with the indicated TCI state is consistent with the SS / PBCH indicated by the third DCI, the transmission power of the PRACH is dependent on the PL offset associated with the indicated TCI state; when the reference signal associated with the indicated TCI state is not consistent with the SS / PBCH indicated by the third DCI, the transmission power of the PRACH is independent of the PL offset associated with the indicated TCI state; or; when the reference signal associated with the indicated TCI state is consistent with the SS / PBCH indicated by the third DCI, the transmission power of the PRACH is independent of the PL offset associated with the indicated TCI state; when the reference signal associated with the indicated TCI state is not consistent with the SS / PBCH indicated by the third DCI, the transmission power of the PRACH is dependent on the PL offset associated with the indicated TCI state.

21. The method of claim 19, wherein, determining whether the transmission power of the PRACH is dependent on the PL offset associated with the indicated TCI state from at least two of the reference signal associated with the indicated TCI state, the SS / PBCH indicated by the third DCI, and the reference signal quasi co-located with the DMRS of the third DCI comprises: when the reference signal associated with the indicated TCI state is consistent with the reference signal quasi co-located with the DMRS of the third DCI, determining that the transmission power of the PRACH is dependent on the PL offset associated with the indicated TCI state; when the reference signal associated with the indicated TCI state is not consistent with the reference signal quasi co-located with the DMRS of the third DCI, determining that the transmission power of the PRACH is independent of the PL offset associated with the indicated TCI state; or; when the reference signal associated with the indicated TCI state is consistent with the reference signal quasi co-located with the DMRS of the third DCI, determining that the transmission power of the PRACH is independent of the PL offset associated with the indicated TCI state; when the reference signal associated with the indicated TCI state is not consistent with the reference signal quasi co-located with the DMRS of the third DCI, determining that the transmission power of the PRACH is dependent on the PL offset associated with the indicated TCI state. determining that the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state when the reference signal associated with the indicated TCI state is inconsistent with the reference signal quasi co-located with the DMRS of the third DCI.

22. The method of claim 19, wherein, determining whether the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state according to at least two of the reference signal associated with the indicated TCI state, the SS / PBCH indicated by the third DCI, and the reference signal quasi co-located with the DMRS of the third DCI, comprises: determining that the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state when the SS / PBCH indicated by the third DCI is consistent with the reference signal quasi co-located with the DMRS of the third DCI; determining that the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state when the SS / PBCH indicated by the third DCI is inconsistent with the reference signal quasi co-located with the DMRS of the third DCI; or; determining that the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state when the SS / PBCH indicated by the third DCI is consistent with the reference signal quasi co-located with the DMRS of the third DCI; determining that the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state when the SS / PBCH indicated by the third DCI is inconsistent with the reference signal quasi co-located with the DMRS of the third DCI.

23. The method according to any one of claims 17-22, characterized in that, the reference signal associated with the indicated TCI state is a QCL resource of the indicated TCI state, and the reference signal quasi co-located with the DMRS of the third DCI is a QCL resource of the DMRS of the first DCI.

24. The method according to any one of claims 17-23, characterized by, the third DCI comprises a PDCCH order DCI or a DCI format 1_0 or a PDCCH order. the PRACH is a PDCCH order PRACH, or a RACH triggered by a PDCCH order.

25. The method of any one of claims 1-24, wherein, when the number of the indicated TCI states is 2, the indicated TCI states comprise a first indicated TCI state and a second indicated TCI state, and the first DCI is further used to indicate that the transmission power of the PRACH is determined according to the reference signal associated with the first indicated TCI state or according to the reference signal associated with the second indicated TCI state.

26. The method of any one of claims 1-25, wherein, when the number of the indicated TCI states is 2, only one of the indicated TCI states is associated with the PL offset.

27. A communications device, characterized by the communication device comprises a processor configured to support the communication device to perform the method of any one of claims 1-3, or the method of any one of claims 8-11, or the method of any one of claims 17-26.

28. A communications device, characterized by the communication device comprises a processor configured to support the communication device to perform the method of any one of claims 4-7, or the method of any one of claims 12-16.

29. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions that, when executed on a computer, cause the computer to perform the method of claims 1-26.

30. A computer program product, characterised in that, The computer program product comprises computer instructions that, when executed on a computer, cause the computer to perform the method of any of claims 1-26.

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