Communication method and device

Abstract

The invention discloses a communication method, device and system, relates to the technical field of communication, and aims to solve the problem of how to determine proper path loss information by terminal equipment. The method comprises: receiving first downlink control information (DCI), the first DCI being used for a random access process, the first DCI indicating whether transmission power of a physical random access channel (PRACH) in the random access process is related to PL bias associated with an indicated TCI state; and determining the transmission power of the PRACH according to the first DCI.

Description

Technical Field

[0001] This application relates to the field of communications, and more particularly to a communication method and apparatus. Background Technology

[0002] 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, triggering the terminal device to transmit a PDCCH order PRACH to either the first or second network device (such as a second TRP). Because the path loss from the terminal device to the first and second network devices is different, the terminal device needs to apply different path loss information when determining the PRACH transmission power. Currently, appropriate path loss information can be determined by indicating reference signals from different network devices. To improve uplink coverage in cellular communication systems, uplink (UL) transmission and reception nodes (TRPs) are introduced, and the UL TRP may not have available downlink reference signals. In this case, how to enable the terminal device to determine appropriate path loss information is a problem that needs to be solved. Summary of the Invention

[0003] This application provides a communication method, apparatus, and system to address the problem of how to enable terminal devices to determine appropriate road loss information.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] In a first aspect, embodiments of this application provide a communication method, which can be executed by a terminal device and a functional module or chip within the terminal device. Taking the execution by the terminal device as an example, the method includes: 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 the physical random access channel (PRACH) in the random access procedure is related to the PL offset associated with the indicated TCI state; and determining the transmission power of the PRACH based on the first DCI.

[0006] Based on the first approach, the PDCCH-order DCI directly instructs the terminal device whether to apply PL offset when determining the PRACH transmit power, thereby avoiding excessively high or low PRACH transmission power and improving PRACH efficiency.

[0007] In one possible design, the first DCI includes a first field; determining the transmission power of the PRACH based on 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 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 independent of the PL offset associated with the indicated TCI state; or,

[0008] When the first field of the first DCI is a first value, the transmission power of the PRACH is independent of 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 related to the PL offset associated with the indicated TCI state.

[0009] In one possible design, the first field is the PRACH association indicator.

[0010] In one possible design, the first DCI includes: PDCCH order DCI or DCI format 1_0 or PDCCHorder; PRACH is PDCCH order PRACH, or RACH triggered by PDCCH order.

[0011] Secondly, embodiments of this application provide a communication method, which can be executed by a network device and a functional module or chip within the network device. Taking the execution by the network device as an example, the method includes: sending 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 the physical random access channel (PRACH) in the random access procedure is related to the PL offset associated with the indicated TCI state, and the first DCI being used to determine the transmission power of the PRACH.

[0012] Based on the second approach, the PDCCH-order DCI directly instructs the terminal device whether to apply PL offset when determining the PRACH transmit power, thereby avoiding excessively high or low PRACH transmission power and improving PRACH efficiency.

[0013] In one possible design, the first DCI includes a first field; determining the transmission power of the PRACH based on 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 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 independent of the PL offset associated with the indicated TCI state; or,

[0014] When the first field of the first DCI is a first value, the transmission power of the PRACH is independent of 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 related to the PL offset associated with the indicated TCI state.

[0015] In one possible design, the first field is the PRACH association indicator.

[0016] In one possible design, the first DCI includes: PDCCH order DCI or DCI format 1_0 or PDCCHorder; PRACH is PDCCH order PRACH, or RACH triggered by PDCCH order.

[0017] Thirdly, embodiments of this application provide a communication method, which can be executed by a terminal device and a functional module or chip within the terminal device. Taking the terminal device as an example, the method includes: receiving a second downlink control information (DCI), the second DCI being used for random access procedures, the second DCI indicating a first timing advance group (TAG); and determining the transmission power of PRACH based on the first TAG indicated by the second DCI and the TAG associated with the indicated transmission configuration indication (TCI) state.

[0018] Based on the third approach, the TAG indicated by the PDCCH-order DCI and the TAG of the indicated TCI state jointly determine whether the terminal device applies PL offset when determining the PRACH transmit power, thereby avoiding excessively high or low PRACH transmission power and improving PRACH efficiency.

[0019] In one 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 the 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 independent of the PL offset associated with the indicated TCI state; or,

[0020] When the first TAG is the same as the TAG associated with the indicated TCI state, the transmission power of PRACH is independent of the PL bias associated with the indicated TCI state.

[0021] When the first TAG is different from the TAG associated with the indicated TCI state, the transmission power of PRACH is related to the PL bias associated with the indicated TCI state.

[0022] In one possible design, the second DCI includes a second field that indicates the first TAG.

[0023] In one possible design, the second field is the PRACH association indicator.

[0024] In one possible design, the second DCI includes: PDCCH order DCI or DCI format 1_0 or PDCCHorder; PRACH is PDCCH order PRACH, or RACH triggered by PDCCH order.

[0025] Fourthly, embodiments of this application provide a communication method, which can be executed by a terminal device and a functional module or chip within the terminal device. Taking the execution by the terminal device as an example, the method includes: sending a second downlink control information (DCI), the second DCI being used for random access procedures, the second DCI indicating a first timing advance group (TAG), and the first TAG indicated by the second DCI being used to determine the transmission power of PRACH.

[0026] Based on the fourth aspect of the method, the TAG indicated by the PDCCH-order DCI and the TAG of the indicated TCI state jointly determine whether the terminal device applies PL offset when determining the PRACH transmit power, so as to avoid the PRACH transmit power being too high or too low and improve PRACH efficiency.

[0027] In one possible design, when the first TAG is the same as the TAG associated with the indicated TCI state, the PRACH transmission power 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 PRACH transmission power is independent of the PL bias associated with the indicated TCI state; or,

[0028] When the first TAG is the same as the TAG associated with the indicated TCI state, the transmission power of PRACH is independent of the 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 PRACH is related to the PL offset associated with the indicated TCI state.

[0029] In one possible design, the second DCI includes a second field that indicates the first TAG.

[0030] In one possible design, the second field is the PRACH association indicator.

[0031] In one possible design, the second DCI includes: PDCCH order DCI or DCI format 1_0 or PDCCHorder; PRACH is PDCCH order PRACH, or RACH triggered by PDCCH order.

[0032] Fifthly, embodiments of this application provide a communication method, which can be executed by a terminal device and a functional module or chip within the terminal device. Taking the execution by the terminal device as an example, the method includes: receiving third downlink control information (DCI), the third DCI being used for random access procedures; and determining the transmission power of the physical random access channel (PRACH) based on at least two of the following: a reference signal associated with the 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 the demodulation reference signal (DMRS) of the third DCI.

[0033] In one possible design, when the indicated TCI state is not associated with the path loss PL bias, the transmission power of PRACH is independent of the PL bias.

[0034] In one possible design, when the indicated TCI state is associated with a path loss PL bias, determining the transmission power of the PRACH based on 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 includes: determining whether the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state based on 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.

[0035] In one possible design, determining whether the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state, based on 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-addressable with the DMRS of the third DCI, includes: when the reference signal associated with the indicated TCI state coincides 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 does not coincide with the SS / PBCH indicated by the third DCI, the transmission power of the PRACH is unrelated to the PL offset associated with the indicated TCI state; or;

[0036] 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 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.

[0037] Based on this design, the SSB indicated by the PDCCH-order DCI and the QCLsource of the indicated TCI state jointly determine whether the terminal device applies the PL offset. In this way, in the asymmetric TRP scenario, the terminal device is implicitly instructed whether to apply the PL offset when determining the PRACH transmit power, so as to avoid the PRACH transmit power being too high or too low and improve the PRACH efficiency.

[0038] In one possible design, determining whether the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state, based on 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-addressable with the DMRS of the third DCI, includes: 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 consistent with the reference signal quasi-co-addressable with the DMRS of the third DCI; and determining that the transmission power of the PRACH is unrelated 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-addressable with the DMRS of the third DCI; or;

[0039] When the reference signal associated with the indicated TCI state is consistent with the reference signal of the DMRS quasi-co-address of the third DCI, it is determined that the transmission power of the PRACH is independent of the PL bias associated with the indicated TCI state; when the reference signal associated with the indicated TCI state is inconsistent with the reference signal of the DMRS quasi-co-address of the third DCI, it is determined that the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state.

[0040] Based on this design, 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. In this way, in the asymmetric TRP scenario, the UE is implicitly instructed whether to apply the PL offset when determining the PRACH transmit power, so as to avoid the PRACH transmission power being too high or too low and improve the PRACH efficiency.

[0041] In one possible design, determining whether the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state, based on 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-addressable with the DMRS of the third DCI, includes: 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-addressable with the DMRS of the third DCI; determining that the transmission power of the PRACH is unrelated 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-addressable with the DMRS of the third DCI; or;

[0042] When the SS / PBCH indicated by the third DCI is consistent with the reference signal of the DMRS quasi-co-address of the third DCI, it is determined that the transmission power of the PRACH is independent of the PL bias associated with the indicated TCI state; when the SS / PBCH indicated by the third DCI is inconsistent with the reference signal of the DMRS quasi-co-address of the third DCI, it is determined that the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state.

[0043] Based on this design, 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. In this way, in the asymmetric TRP scenario, the UE is implicitly instructed whether to apply the PL offset when determining the PRACH transmit power, so as to avoid the PRACH transmit power being too high or too low and improve the PRACH efficiency.

[0044] In one possible design, the reference signal associated with the indicated TCI state is the QCL resource of the indicated TCI state, and the reference signal of the DMRS quasi-co-address of the first DCI is the QCL resource of the DMRS of the third DCI.

[0045] In one possible design, the third DCI includes: PDCCH order DCI or DCI format 1_0 or PDCCHorder; PRACH is PDCCH order PRACH, or RACH triggered by PDCCH order.

[0046] In one 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. The third DCI is also used to indicate the transmission power of the PRACH determined according to the reference signal associated with the first indicated TCI or the transmission power of the PRACH determined according to the reference signal associated with the second indicated TCI.

[0047] In one possible design, when the number of indicated TCI states is 2, only one of the indicated TCI states is associated with a PL bias.

[0048] Sixthly, embodiments of this application provide a communication method, which can be executed by a network device and a functional module or chip within the network device. Taking the execution by the network device as an example, the method includes: sending a third downlink control information (DCI), the third DCI being used for random access procedures; and at least two of the following: an indicated transmission configuration indicating a reference signal associated with the TCI state, a synchronization signal physical broadcast channel (SS / PBCH) indicated by the third DCI, and a reference signal quasi-co-located with the demodulation reference signal (DMRS) of the third DCI, for determining the transmission power of the physical random access channel (PRACH).

[0049] In one possible design, when the indicated TCI state is not associated with the path loss PL bias, the transmission power of PRACH is independent of the PL bias.

[0050] In one possible design, when the indicated TCI state is associated with a path loss PL bias, 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, are used to determine whether the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state.

[0051] In one possible design, the reference signal associated with the indicated TCI state is the QCL resource of the indicated TCI state, and the reference signal for the DMRS quasi-co-addressable third DCI is the QCL resource of the DMRS of the third DCI.

[0052] In one possible design, the third DCI includes: PDCCH order DCI or DCI format 1_0 or PDCCHorder; PRACH is PDCCH order PRACH, or RACH triggered by PDCCH order.

[0053] In one 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. The third DCI is also used to indicate the transmission power of the PRACH determined according to the reference signal associated with the first indicated TCI or the transmission power of the PRACH determined according to the reference signal associated with the second indicated TCI.

[0054] In one possible design, when the number of indicated TCI states is 2, only one of the indicated TCI states is associated with a PL bias.

[0055] Seventhly, this application provides a communication device, which can be a terminal device, a chip or system-on-a-chip in the terminal device, or a functional module in the terminal device for implementing the methods in any possible design of the first, third, or fifth aspect. This communication device can implement the functions performed by the terminal device in any possible design of the first, third, or fifth aspect, and these functions can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the aforementioned functions. For example, the communication device may include a transceiver unit and a processing unit.

[0056] Specifically, the relevant descriptions can be referred to in any possible design of the first, third, or fifth aspect. At the same time, the execution actions of each unit of the communication device can be referred to in any possible design of the first, third, or fifth aspect, and will not be elaborated here.

[0057] Eighthly, this application provides a communication device, which can be a network device or a chip or system-on-a-chip within a network device, or a functional module within a network device for implementing the methods in any possible design of the second, fourth, or sixth aspect. This communication device can implement the functions performed by the terminal device in any possible design of the second, fourth, or sixth aspect, and these functions can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the aforementioned functions. For example, the communication device may include a transceiver unit and a processing unit.

[0058] Specifically, the relevant descriptions can be found in any of the possible designs of the second, fourth, or sixth aspects. At the same time, the execution actions of each unit of the communication device can be found in any of the possible designs of the second, fourth, or sixth aspects, and will not be elaborated upon here.

[0059] Ninthly, this application provides a communication device, which can be a terminal device or a chip or system-on-a-chip within a terminal device. This communication device can implement the functions performed by the terminal device in the possible designs of the first, third, or fifth aspects described above, and these functions can be implemented in hardware.

[0060] In one possible design, the communication device includes a processor and a communication interface. The processor and communication interface are used to support the communication device in performing the communication methods described in the first, third, or fifth aspects of the design.

[0061] In another possible design, the communication device may further include a memory for storing computer execution instructions and data necessary for the communication device. When the communication device is running, the processor executes the computer execution instructions stored in the memory to cause the communication device to perform the communication method as described in any of the possible designs of the first, third, or fifth aspects above.

[0062] In a tenth aspect, this application provides a communication device, which can be a network device or a chip or system-on-a-chip within a network device. This communication device can implement the functions performed by the network device in the possible designs of the second, fourth, or sixth aspects described above, and these functions can be implemented in hardware.

[0063] In one possible design, the communication device includes a processor and a communication interface. The processor and communication interface are used to support the communication device in performing the communication methods described in any of the possible designs of the second, fourth, or sixth aspects.

[0064] In another possible design, the communication device may further include a memory for storing computer execution instructions and data necessary for the communication device. When the communication device is in operation, the processor executes the computer execution instructions stored in the memory to cause the communication device to perform the communication method as described in any of the possible designs of the second, fourth, or sixth aspects above.

[0065] In the eleventh aspect, this application provides a computer-readable storage medium that stores computer instructions that, when executed on a computer, cause the computer to perform any of the possible design communication methods in the first to sixth aspects.

[0066] In a twelfth aspect, this application provides a computer program product including computer instructions that, when executed on a computer, cause the computer to perform the communication method in any of the possible designs of the first to sixth aspects. Attached Figure Description

[0067] Figure 1 A schematic diagram illustrating a communication scenario provided in an embodiment of this application;

[0068] Figure 2 A schematic diagram of a communication system provided in an embodiment of this application;

[0069] Figure 3 A flowchart illustrating a communication method provided in an embodiment of this application;

[0070] Figure 4 A flowchart illustrating another communication method provided in an embodiment of this application;

[0071] Figure 5 A flowchart illustrating another communication method provided in an embodiment of this application;

[0072] Figure 6 This is a schematic diagram of the structure of a communication device provided in an embodiment of this application;

[0073] Figure 7 This is a schematic diagram of the structure of a communication device provided in an embodiment of this application. Detailed Implementation

[0074] Before introducing the embodiments of this application, some technical terms involved in the embodiments of this application will be explained. It should be noted that the following explanations are for the purpose of making the embodiments of this application easier to understand, and should not be regarded as a limitation on the scope of protection claimed by the embodiments of this application.

[0075] When determining the uplink signal transmit power, the terminal device needs to obtain the path loss between the terminal device and the network device. When the network device sends a downlink reference signal, the terminal device can measure the downlink reference signal to obtain the path loss. To improve the uplink coverage of cellular communication systems, an uplink (UL) transmission and reception point (TRP) is introduced. The terminal device can send uplink signals to the uplink TRP and receive downlink signals from the downlink (DL) TRP. Unlike 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 PL offset between the uplink and downlink path losses to the terminal device, that is, the path loss offset PL offset between the terminal device and the UL TRP and DL TRP. The terminal device can apply this path loss offset PL offset when sending uplink signals to the UL TRP. Specifically, the terminal device measures the downlink reference signal to obtain the downlink path loss, and then combines it with the PL offset notified or configured by the network device to determine the uplink path loss.

[0076] Regarding how network devices configure and notify terminal devices of PL offset, one feasible method is for the network device to configure TCI state for the terminal device. TCI state can be associated with PL offset, and the network device can update the value of PL offset through MACCE signaling. When the terminal device performs uplink transmission, it determines the transmission power of the uplink signal based on the PL offset associated with TCI state.

[0077] The TCI (Transportation Control Element) is configured by the network device for the terminal device via RRC (Redirect Receipts / Content Requests) messages, and is referred to as the TCI state in the configuration signaling. After configuring the TCI state for the terminal device via RRC messages, the network device can send a Medium Access Control-Control Element (MAC-CE) signaling message to the terminal device. This MAC-CE signaling message 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 (Distributed Control Element) message to the terminal device, which indicates one or more TCI states activated by the MAC-CE. In this document, the two descriptions, TCI-state and TCI state, are interchangeable.

[0078] When transmitting PRACH, the terminal device can apply a path loss offset value (PL offset). The transmission power of the PRACH after applying the path loss offset value (PL offset) satisfies the following formula:

[0079] P PRACH,b,f,c (i)=min{P CMAX,f,c (i),P PRACH,target,f,c +PL b,f,c +PL offset}[dBm],

[0080] or

[0081] P PRACH,b,f,c (i)=min{P CMAX,f,c (i),P PRACH,target,f,c +PL b,f,c -PL offset}[dBm].

[0082] Network devices can send a PDCCH to a terminal device to trigger initial access. This PDCCH is a special DCI format 1_0, where all values ​​in the frequency domain resource assignment field are 1. Generally, this PDCCH is used by the terminal device to trigger PDCCHorder PRACH transmission when uplink synchronization fails, thereby enabling the terminal device and network device to re-establish uplink synchronization. The DCI format 1_0 that triggers PDCCH order PRACH transmission is sometimes also called PDCCH order DCI or PDCCH order.

[0083] In a multiple TRPs scenario, a PDCCH order DCI from the first TRP can trigger a PDCCH order PRACH transmission for either the first or second TRP. Since the first and second TRPs are physically located differently, the path loss between the terminal device and the first and second TRPs is also different. The terminal device can determine the appropriate PRACH transmission power based on path loss measurements from downlink reference signals from different TRPs, avoiding excessively high or low PRACH power and improving PRACH efficiency.

[0084] Specifically, in the inter-cell multi-TRP scenario, the UE will configure the higher-layer parameter SSB-MTC-AdditionalPCI, that is, the PCI corresponding to the first TRP and the second TRP are different. The PDCCH order DCI can notify the terminal device of the PCI corresponding to the PDCCH orderPRACH transmission triggered by the PDCCH order DCI through a 1-bit PRACH association indicator, so that the UE can determine the PRACH transmission power based on the downlink reference signals from different cells.

[0085] In an intra-cell multi-TRP scenario, the PDCCH order DCI can use a 1-bit PRACH association indicator to notify the terminal device to determine the downlink reference signal used for the path loss of the 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 of the DMRS quasi-co-address of the PDCCH-order. 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.

[0086] In asymmetric DL single TRP / UL multiple TRP scenarios, a PDCCH-order DCI from a DL TRP can trigger a PDCCH-order PRACH transmission for either the DL TRP or 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 to determine whether to determine the PRACH transmission power based on the PL offset associated with the indicated TCI state. However, existing technology cannot be applied in asymmetric DL single TRP / UL multiple TRP scenarios because there is no available downlink reference signal for the UL TRP.

[0087] Typical system architectures or application scenarios of this invention include: Figure 1 As shown, Transmitter Receiver Node 1 (TRP 1) and Transmitter Receiver Node 2 (TRP 2) are network devices, and the terminal device can be a User Equipment (UE). In connected mode, the UE receives downlink data or control channels such as SSB, PDCCH, and PDSCH, as well as synchronization signals, from TRP 1. The UE sends uplink data or control signals such as PUSCH and PUCCH to TRP 2. Simultaneously, the UE sends SRS to either TRP 1 or TRP 2 for functions such as obtaining uplink and downlink channel information and beam management. TRP 1 can be referred to as DL TRP, and TRP 2 can be referred to as UL TRP.

[0088] The communication method provided in the embodiments of this application will be described below with reference to the accompanying drawings.

[0089] The technical solutions of this application embodiment can be used in various communication systems. These systems can be third-generation partnership project (3GPP) communication systems, such as long-term evolution (LTE) systems; fifth-generation (5G) mobile communication systems; new radio (NR) systems; beyond-5G (B5G) mobile communication systems; sixth-generation (6G) mobile communication systems; vehicle-to-everything (NR V2X) systems; LTE and 5G hybrid networking systems; device-to-device (D2D) communication systems; machine-to-machine (M2M) communication systems; the Internet of Things (IoT); and other next-generation communication systems. They can also be non-3GPP communication systems, without limitation. The following examples illustrate this. Figure 2 Taking the communication system shown as an example, the method for sending the preamble of the random access procedure provided in this application embodiment will be described.

[0090] The technical solutions of this application can be applied to various communication scenarios, such as 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 communications (mMTC), D2D, V2X, and IoT communication scenarios.

[0091] The communication system to which the technical solutions of this application are applicable may include terminal devices and network devices. It is understood that terminal devices and network devices can communicate directly with each other or through forwarding from other devices; this application does not specifically limit this. Figure 2 A schematic diagram of a communication system provided in this application embodiment, such as... Figure 2 As shown, the communication system 20 may include: network equipment and terminal equipment.

[0092] Understandably, the above Figure 2This is merely an illustrative diagram and does not constitute a limitation on the applicable scenarios of the technical solutions provided in this application. Those skilled in the art should understand that, in specific implementations, the communication system 20 may also include... Figure 2 The number of devices shown may be fewer, or the communication system 20 may include other devices. The number of devices in the communication system 20 can be determined according to specific needs and is not limited. The following... Figure 2 The devices in the system shown are described.

[0093] Terminal equipment can be user equipment (UE), mobile station (MS), or mobile terminal (MT), including handheld devices, in-vehicle devices, wearable devices, or computing devices with wireless communication capabilities. Specifically, terminal equipment can be a mobile phone, tablet computer, or computer with wireless transceiver capabilities; it can also be a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in autonomous driving, a wireless terminal in telemedicine, a wireless terminal in a smart grid, a wireless terminal in a smart city, a smart home, or an in-vehicle terminal. In the embodiments of this application, the device used to implement the functions of the terminal equipment can be the terminal equipment itself, or it can be a device that supports the terminal equipment in implementing those functions, such as a chip system (e.g., a chip, or a processing system composed of multiple chips) or a modem. The following describes the communication method provided in the embodiments of this application, using the terminal equipment as an example of the device used to implement the functions of the terminal equipment.

[0094] Network equipment, primarily used to implement functions such as resource scheduling, wireless resource management, and wireless access control for terminal devices, is a type of device in a radio access network (RAN) that connects terminal devices to a wireless network. The RAN can be connected to the core network (e.g., the core network of LTE or 5G). Network equipment can be an evolved Node B (eNB or eNodeB) in LTE, a base station in a 5G network or a future evolved public land mobile network (PLMN), a base station supporting unilateral transmission (e.g., an uplink-only TRP or asymmetric TRP supporting uplink transmission but not downlink transmission), a broadband network gateway (BNG), an aggregation switch, or a non-3GPP access device; or, in this embodiment, the network equipment can also be a radio controller in a cloud radio access network (CRAN); a transmission and reception point (TRP), or a device including a TRP, etc. This embodiment does not specifically limit these aspects. Optionally, the network device in this application embodiment may include various forms of base stations, such as macro base stations, micro base stations (also known as small stations), relay stations, access points, etc., and this application embodiment does not specifically limit them. In this application embodiment, the device used to implement the function of the network device may be a network device, or a device that can support the network device to implement the function, such as a chip system (e.g., a chip, or a processing system composed of multiple chips) or a modem. The following describes the communication transmission method provided in this application embodiment, taking the device used to implement the function of the network device as an example.

[0095] Optional, Figure 2 The devices in the process (such as terminal devices and network devices) can also be referred to as communication devices. They can be general-purpose devices or special-purpose devices. This application does not specifically limit them in this regard.

[0096] Optionally, this application Figure 2The relevant functions of each device in the process can be implemented by one device, multiple devices working together, or one or more functional modules within a single device. This application does not specifically limit this. It is understood that the above functions can be network elements in hardware devices, software functions running on dedicated hardware, a combination of hardware and software, or virtualization functions instantiated on a platform (e.g., a cloud platform).

[0097] The following is combined with Figure 2 The communication system shown describes the random access procedure preamble transmission method provided in the embodiments of this application. The actions, terms, etc. involved in the following embodiments can be referred to each other. The message names or parameter names in the messages between devices in each embodiment are just examples, and other names can be used in specific implementations. For example, "corresponding" in the following embodiments can be replaced by "associating", etc., and "sending" in the following embodiments can be replaced by "transmitting", etc.

[0098] A flowchart illustrating another communication method provided in this application embodiment is shown below. Figure 3 As shown, it may include steps S301-S302:

[0099] Step S301: The network device sends a first downlink control information (DCI) to the terminal device. The first DCI is used for the random access procedure. The first DCI indicates whether the transmission power of the physical random access channel (PRACH) in the random access procedure is related to the PL offset associated with the indicated TCI state.

[0100] For details on the random access procedure, please refer to the description of step S301.

[0101] In this embodiment of the application, the network device can be a TRP.

[0102] Specifically, the aforementioned PRACH can be PDCCH-order PRACH. PDCCH-order PRACH is a PRACH transmission triggered by network devices through DCI format 1_0, used by terminal devices to trigger PRACH transmission when uplink synchronization is lost, thereby enabling the terminal devices and network devices to re-establish uplink synchronization.

[0103] Specifically, the format of the first DCI mentioned above can be DCI format 1_0. The DCI format 1_0 that triggers 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, it is different from other DCI format 1_0 for other purposes in that its Frequency domainresource assignment field is all 1.

[0104] Specifically, the first DCI can directly indicate whether the transmission power of the terminal device's PRACH is related to the PL bias associated with the indicated TCI state. That is, the first DCI can directly indicate whether the terminal device applies the PL bias associated with the indicated TCI state when determining the PRACH power.

[0105] The first DCI may include a first field, which indicates whether the transmission power of the terminal device's PRACH is related to the PL bias associated with the indicated TCI state. This embodiment can reuse an existing PRACH association indicator to perform the above indication.

[0106] Step S302: Determine the transmission power of PRACH based on the first DCI.

[0107] The TCI status indicated above can be associated with a path loss offset (PL offset). When the indicated TCI status is associated with a PL offset, the terminal device can determine whether to apply the PL offset when determining the PRACH transmit power. When the indicated TCI status is not associated with a PL offset, the PL offset is not applied to the PRACH transmit power.

[0108] Specifically, when the value of the first field of the first DCI is a first value (e.g., the first value is 0), the transmission power of PRACH is related to the PL offset associated with the indicated TCI state. That is, when the terminal device determines the PRACH transmission power, it applies the PL offset associated with the indicated TCI state, or the terminal device determines the PRACH transmission power based on the PL offset associated with the indicated TCI state. When the value of the first field of the first DCI is a second value (e.g., the second value is 1), the transmission power of PRACH is unrelated to the PL offset associated with the indicated TCI state. That is, when the terminal device determines the PRACH transmission power, it does not apply or ignores the PL offset associated with the indicated TCI state.

[0109] Alternatively, this method can be modified as follows: when the value of the first field of the first DCI is a first value (e.g., the first value is 0), the transmission power of PRACH is independent of 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 PRACH transmission power; when the value of the first field of the first DCI is a second value (e.g., the second value is 1), the transmission power of 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 PRACH transmission power, or the terminal device determines the PRACH transmission power based on the PL offset associated with the indicated TCI state.

[0110] In this embodiment, the PDCCH-order DCI directly instructs the terminal device whether to apply PL offset when determining the PRACH transmit power, thereby avoiding excessively high or low PRACH transmission power and improving PRACH efficiency.

[0111] When the number of 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 also used to indicate the PRACH transmission power determined according to the reference signal associated with the first indicated TCI or the PRACH transmission power determined according to the reference signal associated with the second indicated TCI.

[0112] Specifically, the PRACH association indicator, an existing field in the PDCCH-order DCI, can be used to indicate which specific TCI state is used to determine the PRACH transmission power. Specifically, when the PRACH association indicator value is 0, the indicated TCI state in the above method can be replaced with the first indicated TCI state; when the PRACH association indicator value is 1, the indicated TCI state in the above method can be replaced with the second indicated TCI state; or, when the PRACH association indicator value is 1, the indicated TCI state in the above method can be replaced with the first indicated TCI state; when the PRACH association indicator value is 0, the indicated TCI state in the above method can be replaced with the second indicated TCI state. The PRACH association indicator can also be replaced with other fields in the PDCCH-order DCI.

[0113] 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 have a non-zero associated PL offset. The indicated TCI state in the above method can be understood as either an indicated TCI state associated with a PL offset or an indicated TCI state with a non-zero associated PL offset. 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 has a non-zero associated PL offset.

[0114] In this invention, the two description methods of TCI state and TCI state can be interchanged; the description methods of indicated TCI state and indicated TCI state or indicated TCI state can be interchanged.

[0115] A flowchart illustrating another communication method provided in this application embodiment is shown below. Figure 4 As shown, it may include steps S401-S402:

[0116] Step S401: The network device sends a second downlink control information (DCI) to the terminal device. The second DCI is used for random access procedures and indicates the first timing advance group (TAG).

[0117] For details on the random access procedure, please refer to the description of step S301.

[0118] In this embodiment of the application, the network device can be a TRP.

[0119] Specifically, the aforementioned PRACH can be PDCCH-order PRACH. PDCCH-order PRACH is a PRACH transmission triggered by network devices through DCI format 1_0, used by terminal devices to trigger PRACH transmission when uplink synchronization is lost, thereby enabling the terminal devices and network devices to re-establish uplink synchronization.

[0120] Specifically, the format of the second DCI mentioned above can be DCI format 1_0. The DCI format 1_0 that triggers 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, it is different from other DCI format 1_0 for other purposes in that its Frequency domainresource assignment field is all 1.

[0121] Specifically, when the second DCI is a PDCCH-order DCI, the existing field PRACH association indicator in the PDCCH-order DCI can be reused to indicate the TAG, or other fields can be added to the PDCCH-order to indicate the TAG.

[0122] Step S402: Determine the transmission power of PRACH based on the first TAG indicated by the second DCI and the TAG associated with the indicated transmission configuration indication TCI state.

[0123] The description of the TCI status indicated above can be found in step 302, and will not be repeated here.

[0124] The following section uses the second DCI, PDCCH-order DCI, as an example.

[0125] The TAG associated with the indicated TCI state can be understood as the tag-Id-ptr field associated with the information element CandidateTCI-State, CandidateTCI-UL-State, TCI-State, and TCI-UL-State, indicating the TAG associated with that TCI state. The value n0 represents the association between the TCI state and the TAG indicated by the higher-level field tag-Id, and the value n1 represents the association between the TCI state and the TAG indicated by the higher-level field tag2-Id.

[0126] The field tag-Id-ptr can also be replaced with the field tag-Id-ptr-r18.

[0127] The TCI status indicated above can be associated with a path loss offset (PL offset). When the indicated TCI status is associated with a PL offset, the terminal device can determine whether to apply the PL offset when determining the PRACH transmit power. When the indicated TCI status is not associated with a PL offset, the PL offset is not applied to the PRACH transmit power.

[0128] When the indicated TCI state is associated with a PL offset, or when 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 PRACH transmission power is related to the PL offset associated with the indicated TCI state. That is, when the terminal device determines the PRACH transmission power, it applies the PL offset associated with the indicated TCI state, or the terminal device determines the PRACH transmission power based on the PL offset associated with the indicated TCI state. If the first TAG indicated by the PDCCH-order DCI is different from the TAG associated with the indicated TCI state, the PRACH transmission power is unrelated to the PL offset associated with the indicated TCI state. That is, when the terminal device determines the PRACH transmission power, it does not apply or ignores the PL offset associated with the indicated TCI state.

[0129] Alternatively, this method can be modified as follows: if the first TAG indicated by the PDCCH-order DCI is different from the TAG associated with the indicated TCI state, the transmission power of PRACH is related to the PL offset associated with the indicated TCI state. That is, when the terminal device determines the PRACH transmission power, it applies the PL offset associated with the indicated TCI state, or the terminal device determines the PRACH transmission power based on the PL offset associated with the indicated TCI state. 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 PRACH is unrelated to the PL offset associated with the indicated TCI state. That is, when the terminal device determines the PRACH transmission power, it does not apply or ignores the PL offset associated with the indicated TCI state.

[0130] The PDCCH-order DCI described in this embodiment can indicate the first TAG through the 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-level tag-Id field; when the value of the second field is 1, the first TAG indicated by the second field is the TAG indicated by the higher-level tag2-Id field. 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-level tag2-Id field; when the value of the second field is 1, the first TAG indicated by the second field is the TAG indicated by the higher-level tag-Id field.

[0131] The second field of the PDCCH-order DCI described in this embodiment can be the PRACH associationindicator, or it can be another newly added field.

[0132] In this embodiment, the TAG indicated by the PDCCH-order DCI and the TAG of the indicated TCI state jointly determine whether the terminal device applies PL offset when determining the PRACH transmit power, so as to avoid the PRACH transmission power being too high or too low and improve PRACH efficiency.

[0133] When the number of 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 also used to indicate the PRACH transmission power determined according to the reference signal associated with the first indicated TCI or the PRACH transmission power determined according to the reference signal associated with the second indicated TCI.

[0134] Specifically, the PRACH association indicator, an existing field in the PDCCH-order DCI, can be used to indicate which specific TCI state is used to determine the PRACH transmission power. Specifically, when the PRACH association indicator value is 0, the indicated TCI state in the above method can be replaced with the first indicated TCI state; when the PRACH association indicator value is 1, the indicated TCI state in the above method can be replaced with the second indicated TCI state; or, when the PRACH association indicator value is 1, the indicated TCI state in the above method can be replaced with the first indicated TCI state; when the PRACH association indicator value is 0, the indicated TCI state in the above method can be replaced with the second indicated TCI state. The PRACH association indicator can also be replaced with other fields in the PDCCH-order DCI.

[0135] 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 have a non-zero associated PL offset. The indicated TCI state in the above method can be understood as either an indicated TCI state associated with a PL offset or an indicated TCI state with a non-zero associated PL offset. 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 has a non-zero associated PL offset.

[0136] This application provides a flowchart illustrating a communication method, as shown in the embodiments below. Figure 5 As shown, it may include steps S501-S502:

[0137] Step S501: The network device sends a third downlink control information (DCI) to the terminal device. The third DCI is used for the random access procedure.

[0138] Specifically, the third DCI can be used to trigger the terminal device to perform the random access procedure RACH, which includes the terminal device sending the physical random access channel PRACH to the network device.

[0139] In this embodiment of the application, the network device can be a TRP.

[0140] Specifically, the aforementioned PRACH can be PDCCH order PRACH. PDCCH order PRACH is a PRACH transmission triggered by a network device through DCI format 1_0. It is used by a terminal device to trigger PRACH transmission when uplink synchronization is lost, thereby enabling the terminal device and the network device to re-establish uplink synchronization.

[0141] Specifically, the format of the aforementioned third DCI can be DCI format 1_0. The DCI format 1_0 that triggers PDCCH order PRACH transmission can also be called PDCCH order DCI or PDCCH order. The difference between DCI format 1_0 used to trigger PDCCHorder PRACH transmission and other DCI format 1_0 formats is that its Frequency domain resource assignment field is all 1s.

[0142] Step S502: Determine the transmission power of the Physical Random Access Channel (PRACH) based on at least two of the following: the reference signal associated with the indicated transmission configuration 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.

[0143] The following explanation uses the third DCI, which is the PDCCH order DCI, as an example.

[0144] Specifically, the PDCCH order DCI can indicate the synchronization signal block SSB in the 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.

[0145] Specifically, the reference signal for DMRS quasi-co-addressing in PDCCH-order DCI can be understood as the QCL resource of DMRS in PDCCH-order DCI. The reference signal for DMRS quasi-co-addressing in PDCCH-order DCI can also be understood as the reference signal for DMRS quasi-co-addressing in PDCCH, or the reference signal for DMRS quasi-co-addressing in PDCCH-order.

[0146] Specifically, before receiving the third DCI, the terminal device can obtain the indicated TCI state through other received DCIs or other downlink signals. 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 QCL-Info of the TCI-State field of the higher-layer signaling received by the terminal device, or the reference signal indicated by the referenceSignal-r17 field under the TCI-UL-State field of the higher-layer signaling received by the terminal device, or the reference signal indicated by the referenceSignal-r18 field under the CandidateTCI-UL-State field of the higher-layer signaling received by the terminal device, or the reference signal indicated by the referenceSignal-r18 field under the CandidateTCI-State field of the higher-layer signaling received by the terminal device.

[0147] The TCI status indicated above can be associated with the path loss offset (PL offset).

[0148] When the indicated TCI state is not associated with the PL offset, the PL offset is not applied to the PRACH transmit power, or the terminal device can determine that the PL offset will not be used in the PRACH transmit power.

[0149] When the indicated TCI state is associated with a PL offset, or when the PL offset associated with the indicated TCI state is not zero, the terminal device can determine whether the transmission power of the PRACH is related to the PL offset associated with the indicated TCI state based on 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-addressable with the DMRS of the third DCI. 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 the PL offset associated with the indicated TCI state is applied when determining the transmission power of the PRACH, or whether the transmission power of the PRACH is determined based on the PL offset associated with the indicated TCI state.

[0150] In some embodiments, the number of indicated TCI states can be 1 or 2.

[0151] The following describes three methods for determining the PRACH transmit power when the number of indicated TCI states is 1 and the indicated TCI states are associated with a PL offset.

[0152] 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 not related to the PL offset associated with the indicated TCI state.

[0153] Alternatively, this method can be modified such that 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 bias 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 bias associated with the indicated TCI state.

[0154] 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. In the asymmetric TRP scenario, this implicitly instructs the terminal device whether to apply the PL offset when determining the PRACH transmit power, thereby avoiding excessively high or low PRACH transmit power and improving PRACH efficiency.

[0155] When the reference signal associated with the indicated TCI state is consistent with the reference signal of the DMRS quasi-co-address of the third DCI, it is determined that the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state; when the reference signal associated with the indicated TCI state is inconsistent with the reference signal of the DMRS quasi-co-address of the third DCI, it is determined that the transmission power of the PRACH is not related to the PL bias associated with the indicated TCI state.

[0156] Alternatively, this method can be modified to determine that when the reference signal associated with the indicated TCI state is consistent with the reference signal of the DMRS quasi-co-address of the third DCI, the transmission power of the PRACH is independent of the PL bias associated with the indicated TCI state; when the reference signal associated with the indicated TCI state is inconsistent with the reference signal of the DMRS quasi-co-address of the third DCI, the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state.

[0157] In this implementation, the QCL source of the DMRS of the PDCCH-order DCI and the QCL source of the indicated TCIstate jointly determine whether the UE applies the PL offset. In this way, in the asymmetric TRP scenario, the UE is implicitly instructed whether to apply the PL offset when determining the PRACH transmit power, so as to avoid the PRACH power being too high or too low and improve the PRACH efficiency.

[0158] When the SS / PBCH indicated by the third DCI is consistent with the reference signal of the DMRS quasi-co-address of the third DCI, it is determined that the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state; when the SS / PBCH indicated by the third DCI is inconsistent with the reference signal of the DMRS quasi-co-address of the third DCI, it is determined that the transmission power of the PRACH is not related to the PL bias associated with the indicated TCI state.

[0159] Alternatively, this method can be modified to determine that when the SS / PBCH indicated by the third DCI is consistent with the DMRS quasi-co-address reference signal of the third DCI, the transmission power of the PRACH is independent of the PL bias associated with the indicated TCI state; when the SS / PBCH indicated by the third DCI is inconsistent with the DMRS quasi-co-address reference signal of the first DCI, the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state.

[0160] 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. In this way, in the asymmetric TRP scenario, the UE is implicitly instructed whether to apply the PL offset when determining the PRACH transmit power, so as to avoid the PRACH power being too high or too low and improve the PRACH efficiency.

[0161] In the above three implementation methods, the terminal device determines whether to apply PLoffset when determining the PRACH transmit power in the asymmetric TRP scenario based on at least two of the following: the quasi-co-address QCL resources indicating the TCI state of the indicated transmission configuration, the synchronization signal block SSB indicated by the third DCI, and the QCL resources of the demodulation reference signal DMRS associated with the third DCI. This avoids the PRACH transmit power being too high or too low, thereby improving PRACH efficiency.

[0162] When the number of indicated TCI states is 2, for example, the indicated TCI states include the first indicated TCI state and the second indicated TCI state, the third DCI is also used to indicate the transmission power of PRACH determined according to the reference signal associated with the first indicated TCI or the transmission power of PRACH determined according to the reference signal associated with the second indicated TCI.

[0163] Specifically, the PRACH association indicator, an existing field in the PDCCH-order DCI, can be used to indicate which specific TCI state is used to determine the PRACH transmission power. Specifically, when the PRACH association indicator value is 0, the TCI state indicated in the three methods mentioned above can be replaced by the first indicated TCI state; when the PRACH association indicator value is 1, the TCI state indicated in the three methods can be replaced by the second indicated TCI state; or, when the PRACH association indicator value is 1, the TCI state indicated in the three methods can be replaced by the first indicated TCI state; when the PRACH association indicator value is 0, the TCI state indicated in the three methods 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.

[0164] 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 have a non-zero associated PL offset. The indicated TCI states in the above three methods can be understood as either indicated TCI states associated with a PL offset or indicated TCI states with a non-zero associated PL offset. Alternatively, when the number of indicated TCI states is 2, only one indicated TCI state is associated with a PL offset, or only one indicated TCI state has a non-zero associated PL offset.

[0165] The foregoing mainly describes the solutions provided in the embodiments of this application from the perspective of interaction between various devices. It is understood that each device, such as network devices (e.g., traditional base stations), terminal devices, etc., includes corresponding hardware structures and / or software modules to perform the aforementioned functions. Those skilled in the art should readily recognize that, in conjunction with the algorithm steps of the examples described in the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed by hardware or by 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 this application.

[0166] This application embodiment can group network devices, terminal devices, etc., into functional modules according to the above method examples. For example, each functional group can correspond to a functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. It should be noted that the grouping of modules in this application embodiment is illustrative and only represents one logical functional grouping; other grouping methods may be used in actual implementation.

[0167] Figure 6 A structural diagram of a communication device 700 is shown, which can be used to perform the functions of the terminal device involved in the above embodiments. As one possible implementation, Figure 5 The communication device 700 shown includes: a processing unit 7001 and a transceiver unit 7002;

[0168] The processing unit 7001 can support the communication device 700 in executing S301, S401, or S501.

[0169] The transceiver unit 7002 can be used to support the communication device 700 in executing S302, S402, or S502.

[0170] As another feasible approach Figure 5 The communication device 700 shown includes a processing module and a communication module. The processing module controls and manages the operation of the communication device 700. For example, the processing module may integrate the functions of the processing unit 7001 and can be used to support the communication device 700 in executing S301 to S302, S401 to S402, or S501 to S502, and other processes of the technology described herein. The communication module may integrate the functions of the transceiver unit 7002 and can be used to support the communication device 700 in executing S301 to S302, S401 to S402, or S501 to S502, and in communicating with other network entities, such as with… Figure 4 The communication device 700 illustrates communication between functional modules or network entities. The communication device 700 may also include a storage module for storing the program code and data of the communication device 700.

[0171] The aforementioned processing module can be a processor or a controller. It can implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc. The communication module can be a transceiver circuit or a communication interface, etc. 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 device 700 involved in the embodiments of this application can be... Figure 7 The communication device 900 shown. For example, the terminal equipment and network equipment mentioned above can be adopted. Figure 7 The shown composition or includes Figure 7 The components shown. Figure 7 This is a schematic diagram illustrating the composition of a communication device 900 provided in an embodiment of this application, as shown below. Figure 7 As shown, the communication device 900 may include a processor 9001, a communication line 9002, and a communication interface 9003.

[0172] Furthermore, the communication device 900 may also include a memory 9004. The processor 9001, memory 9004, and communication interface 9003 can be connected via a communication line 9002.

[0173] The processor 9001 can be a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 9001 can also be other communication devices with processing capabilities, such as circuits, devices, or software modules.

[0174] Communication line 9002 is used to transmit information between the components included in communication device 900.

[0175] Communication interface 9003 is used for communication with other devices or other communication networks. These other communication networks can be Ethernet, radio access network (RAN), wireless local area network (WLAN), etc. Communication interface 9003 can be a radio frequency module, transceiver, or any communication device capable of communication. This application embodiment uses a radio frequency module as an example to illustrate communication interface 9003. The radio frequency module can include an antenna, radio frequency circuitry, etc., and the radio frequency circuitry can include a radio frequency integrated chip, a power amplifier, etc.

[0176] The memory 9004 is used to store instructions. These instructions can be computer programs.

[0177] The memory 9004 can be a read-only memory (ROM) or other type of static storage device that can store static information and / or instructions; it can also be a random access memory (RAM) or other type of dynamic storage device that can store information and / or instructions; it can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage, magnetic disk storage media or other magnetic storage devices. Optical disc storage includes compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.

[0178] It should be noted that the memory 9004 can exist independently of the processor 9001, or it can be integrated with the processor 9001. The memory 9004 can be used to store instructions, program code, or some data, etc. The memory 9004 can be located inside or outside the communication device 900, without limitation. The processor 9001 is used to execute the instructions stored in the memory 9004 to implement the random access procedure preamble transmission method provided in the following embodiments of this application.

[0179] In one example, processor 9001 may include one or more CPUs, for example Figure 7 CPU0 and CPU1 in the CPU.

[0180] As an optional implementation, the communication device 900 includes multiple processors, for example, besides Figure 7 In addition to processor 9001, it may also include processor 9007.

[0181] As an optional implementation, the communication device 900 also includes an output device 9005 and an input device 9006. The input device 9006 is a keyboard, mouse, microphone, or joystick, etc., and the output device 9005 is a display screen, speaker, etc.

[0182] It should be noted that the communication device 900 can be a desktop computer, laptop computer, network server, mobile phone, tablet computer, wireless terminal, embedded device, chip system, or something else. Figure 7 Equipment with a similar structure. Furthermore... Figure 6 The structural composition shown does not constitute a limitation on the communication device, except... Figure 7 In addition to the components shown, the communication device may include more or fewer components than illustrated, or combine certain components, or have different component arrangements.

[0183] In this embodiment of the application, the chip system may be composed of chips or may include chips and other discrete devices.

[0184] This application also provides a computer-readable storage medium. All or part of the processes in the above method embodiments can be implemented by a computer program instructing related hardware. This program can be stored in the computer-readable storage medium, and when executed, it can include the processes of the above method embodiments. The computer-readable storage medium can be a terminal device of any of the foregoing embodiments, such as an internal storage unit including a data transmission end and / or a data receiving end, like a hard disk or memory of the terminal device. The computer-readable storage medium can also be an external storage device of the terminal device, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the terminal device. Further, the computer-readable storage medium can include both internal storage units and external storage devices of the terminal device. The computer-readable storage medium is used to store the computer program and other programs and data required by the terminal device. The computer-readable storage medium can also be used to temporarily store data that has been output or will be output.

[0185] It should be understood that the collection, storage, use, processing, transmission, provision, and disclosure of user personal information involved in the technical solution of this application all comply with relevant laws and regulations and do not violate public order and good morals. For example, in the technical solution of this application, the processing of user personal information is carried out with the user's authorization, and this will not be repeated hereafter.

[0186] It should be noted that the terms "first" and "second," etc., in the specification, claims, and drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0187] It should be understood that in this application, "at least one (item)" means one or more, "more than one" means two or more, "at least two (items)" means two or three or more, and "and / or" is used to describe the relationship between related objects, indicating that there can be three relationships. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) 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.

[0188] It should be understood that in the embodiments of this application, "B corresponding to A" means that B is associated with A. For example, B can be determined based on A. It should also be understood that determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and / or other information. Furthermore, the term "connection" in the embodiments of this application refers to various connection methods, such as direct connection or indirect connection, to achieve communication between devices, and the embodiments of this application do not impose any limitations on this.

[0189] Unless otherwise specified, the term "transmission" in the embodiments of this application refers to bidirectional transmission, encompassing the actions of sending and / or receiving. Specifically, "transmission" in the embodiments of this application includes sending data, receiving data, or both sending and receiving data. In other words, data transmission here includes uplink and / or downlink data transmission. Data may include channels and / or signals; uplink data transmission refers to uplink channel and / or uplink signal transmission, and downlink data transmission refers to downlink channel and / or downlink signal transmission. The terms "network" and "system" in the embodiments of this application refer to the same concept; a communication system is a communication network.

[0190] Through the above description of the embodiments, those skilled in the art can clearly understand that, for the sake of convenience and brevity, only the grouping of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0191] In the several embodiments provided in this application, it should be understood that the disclosed communication devices and methods can be implemented in other ways. For example, the communication device embodiments described above are merely illustrative. For instance, the grouping of modules or units is only a logical functional grouping, and in actual implementation, there may be other grouping methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between devices or units, and may be electrical, mechanical, or other forms.

[0192] The units described as separate components may or may not be physically separate. A component shown as a unit can be one or more physical units; that is, it can be located in one place or distributed in multiple different locations. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0193] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0194] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, essentially, or the parts that contribute to the prior art, or all or part of the technical solutions, can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to cause a device, such as a microcontroller, chip, or processor, to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media for storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0195] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A communication method, characterized in that, include: Receive first downlink control information (DCI), the first DCI is used for random access procedures, the first DCI indicates whether the transmission power of the physical random access channel (PRACH) in the random access procedure is related to the PL offset associated with the indicated TCI state. The transmission power of the PRACH is determined based on the first DCI.

2. The method according to claim 1, characterized in that, The first DCI includes a first field; Based on the first DCI, determining the transmission power of the PRACH includes: When the first field of the first DCI is a first value, the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state; When the first field of the first DCI is the second value, the transmission power of the PRACH is independent of the PL bias 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 independent of the PL bias associated with the indicated TCI state; When the first field of the first DCI is the second value, the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state.

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

4. A communication method, characterized in that, include: Send a first downlink control information (DCI) for random access procedures. The first DCI indicates whether the transmission power of the physical random access channel (PRACH) in the random access procedure is related to the PL offset associated with the indicated TCI state. The first DCI is used to determine the transmission power of the PRACH.

5. The method according to claim 4, characterized in that, The first DCI includes a first field; When the first field of the first DCI is a first value, the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state; When the first field of the first DCI is the second value, the transmission power of the PRACH is independent of the PL bias 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 independent of the PL bias associated with the indicated TCI state; When the first field of the first DCI is the second value, the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state.

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

7. The method according to any one of claims 1-6, wherein the first DCI comprises: PDCCH order DCI or DCIformat 1_0 or PDCCH order; The PRACH is either a PDCCH order PRACH or a RACH triggered by a PDCCH order.

8. A communication method, characterized in that, include: Receive second downlink control information (DCI), the second DCI is used for random access procedures, and the second DCI indicates the first timing advance group (TAG); The transmission power of the PRACH is determined based on the first TAG indicated by the second DCI and the TAG associated with the indicated transmission configuration indication TCI state.

9. The method according to claim 8, characterized in that, 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 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 independent of 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 independent of 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, wherein the second DCI includes a second field for indicating the first TAG.

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

12. A communication method, characterized in that, include: Send a second downlink control information (DCI), which is used for random access procedures. The second DCI indicates a first timing advance group (TAG), and the first TAG indicated by the second DCI is used to determine the transmission power of the PRACH.

13. The method according to claim 12, characterized in that, 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 independent of 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 independent of 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 of claim 12 or 13, wherein the second DCI includes a second field for indicating the first TAG.

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

16. The method according to any one of claims 8-15, wherein the second DCI comprises: PDCCH order DCI or DCIformat 1_0 or PDCCH order; The PRACH is either a PDCCH order PRACH or a RACH triggered by a PDCCH order.

17. A communication method, characterized in that, include: Receive third downlink control information (DCI), which is used for random access procedures; The transmission power of the Physical Random Access Channel (PRACH) is determined based on at least two of the following: the reference signal associated with the TCI state indicated by the transmission configuration, the synchronization signal of the 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.

18. The method according to claim 1, 4, 8, 12 or 17, characterized in that, When the indicated TCI state is not associated with the path loss (PL) bias, the transmission power of the PRACH is independent of the PL bias.

19. The method according to claim 17, characterized in that, When the indicated TCI state has an associated path loss PL bias, the transmission power of the PRACH is determined based on 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. Based on at least two of the reference signals 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, determine whether the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state.

20. The method according to claim 19, characterized in that, Determining whether the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state, based on at least two of the reference signals 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: 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 bias 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 independent of the PL bias 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 bias 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 bias associated with the indicated TCI state.

21. The method according to claim 19, characterized in that, Determining whether the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state, based on at least two of the reference signals 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: When the reference signal associated with the indicated TCI state is consistent with the reference signal of the DMRS quasi-co-address of the third DCI, it is determined that the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state. When the reference signal associated with the indicated TCI state is inconsistent with the reference signal of the DMRS quasi-co-address of the third DCI, it is determined that the transmission power of the PRACH is unrelated to the PL bias associated with the indicated TCI state. or; When the reference signal associated with the indicated TCI state is consistent with the reference signal of the DMRS quasi-co-address of the third DCI, it is determined that the transmission power of the PRACH is independent of the PL bias associated with the indicated TCI state. When the reference signal associated with the indicated TCI state is inconsistent with the reference signal of the DMRS quasi-co-address of the third DCI, it is determined that the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state.

22. The method according to claim 19, characterized in that, Determining whether the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state, based on at least two of the reference signals 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: When the SS / PBCH indicated by the third DCI is consistent with the reference signal of the DMRS quasi-co-address of the third DCI, it is determined that the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state. When the SS / PBCH indicated by the third DCI is inconsistent with the reference signal of the DMRS quasi-co-address of the third DCI, it is determined that the transmission power of the PRACH is unrelated to the PL bias associated with the indicated TCI state. or; When the SS / PBCH indicated by the third DCI is consistent with the reference signal of the DMRS quasi-co-address of the third DCI, it is determined that the transmission power of the PRACH is independent of the PL bias associated with the indicated TCI state. When the SS / PBCH indicated by the third DCI is inconsistent with the reference signal of the DMRS quasi-co-address of the third DCI, it is determined that the transmission power of the PRACH is related to the PL bias associated with the indicated TCI state.

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

24. The method according to any one of claims 17-23, wherein the third DCI comprises: PDCCH order DCI or DCIformat1_0 or PDCCH order; The PRACH is either a PDCCH order PRACH or a RACH triggered by a PDCCH order.

25. The method according to any one of claims 1-24, characterized in that, 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. The first DCI is also used to indicate the transmission power of the PRACH determined according to the reference signal associated with the first indicated TCI or the transmission power of the PRACH determined according to the reference signal associated with the second indicated TCI.

26. The method according to any one of claims 1-25, characterized in that, When the number of indicated TCI states is 2, only one of the indicated TCI states is associated with a PL bias.

27. A communication device, characterized in that, The communication device includes a processor for supporting the communication device in performing 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 communication device, characterized in that, The communication device includes a processor for supporting the communication device in performing 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 methods as claimed in claims 1-26.

30. A computer program product, characterized in that, The computer program product includes computer instructions that, when executed on a computer, cause the computer to perform the method as described in any one of claims 1-26.

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