Method for determining transmission power and user equipment

Abstract

The invention provides a method executed by user equipment and the user equipment. The method executed by the user equipment comprises the following steps: the user equipment receives a random access response RAR sent by a base station side, and the random access response RAR schedules a PUSCH; determining a path loss offset used for calculating the transmission power of the PUSCH; and calculating the transmission power of the PUSCH based on the determined path loss offset.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and more specifically, to a method for determining transmission power and corresponding user equipment. Background Technology

[0002] To further enhance uplink transmission and reception performance in NR technology, the 3rd Generation Partnership Project (3GPP) plans to study cell scenarios covered by a single downlink transmit / receive node (DL TRP) and multiple uplink transmit / receive nodes (UL TRP). Because the number of uplink and downlink TRPs is asymmetrical, this can be termed an asymmetric scenario. In this scenario, more than one uplink TRP can be deployed within a serving cell, located at different sites within the cell. The base station determines which uplink TRP(s) will provide service to the UE based on the UE's location and direction relative to the uplink TRP. In the downlink direction, all UEs are served by a single downlink TRP located at a single site. Compared to traditional scenarios with UL TRPs and DL TRPs at a single site, this scenario can effectively improve uplink quality.

[0003] In traditional, co-located UL TRP and DL TRP scenarios, because UL TRP and DL TRP are co-located, the UE can determine the uplink path loss based on the path loss of the DL. When calculating the uplink PUSCH transmission power, the downlink path loss is considered as a parameter. However, in the asymmetric scenarios studied, such as... Figure 1 As shown, since DL TRP-1 and UL TRP-1 are co-located, the uplink path loss of UE-1 is equal to the downlink path loss. However, the uplink of UE-2 is provided by UL TRP-2, and its uplink path loss is not entirely equal to the downlink path loss. Because the physical distance between different UL TRPs and the UEs varies, the uplink path loss differs. In this case, the downlink path loss can no longer fully reflect the uplink path loss, hence the introduction of the path loss offset (PL offset) parameter. Different transmission directions or angles can be associated with different PL offsets. When calculating the transmission power of the PUSCH, the UE needs to take the PL offset into account to avoid excessive power and interference to other UEs. When scheduling PUSCH transmission, the base station indicates the TCI state of the PUSCH, and a TCI state is associated with a PL offset. Therefore, the UE can determine the PL offset corresponding to the PUSCH.

[0004] In one case, the UE is scheduled with an UL grant in the received RAR, which corresponds to a PUSCH transmission, in this case, the UE cannot determine the TCI state of the PUSCH, and thus cannot determine the corresponding PL offset, which may cause the problem of excessive transmission power. How to determine the PL offset in this case is a problem to be solved. SUMMARY

[0005] To solve the above problems, the present application provides a method for determining transmission power and a corresponding user equipment.

[0006] According to one aspect of the present application, a method performed by a user equipment is provided, comprising the steps of: receiving, by the user equipment, a random access response (RAR) transmitted by a base station, the RAR scheduling a PUSCH; determining a path loss offset for calculating transmission power of the PUSCH; and calculating the transmission power of the PUSCH based on the determined path loss offset.

[0007] In the above-mentioned method performed by a user equipment, preferably, in the case where the random access procedure involved in the RAR is a two-step random access procedure, the path loss offset is determined according to a PDCCH order or an LTM Cell switch MAC CE triggering the random access procedure.

[0008] In the above-mentioned method performed by a user equipment, preferably, in the case where the random access procedure involved in the RAR is a four-step random access procedure, the path loss offset is determined according to a selected random access resource.

[0009] In the above-mentioned method performed by a user equipment, preferably, in the case where the PDCCH order or the LTM Cell switch MAC CE contains or carries an information element (IE) PLOffsetfactor, the value of the path loss offset is determined according to the IEPLOffsetfactor.

[0010] In the above-mentioned method performed by a user equipment, preferably, in the case where the PDCCH order or the LTM Cell switch MAC CE carries a TCI state and the configuration information of the TCI state contains an IEPLOffsetfactor, the value of the path loss offset is determined according to the IEPLOffsetfactor.

[0011] In the method performed by the user equipment, preferably, in the case that the SSB index is carried by the PDCCH order or the LTMCell switch MAC CE and the configuration information of the SSB index contains the element PLOffsetfactor, the value of the path loss offset is determined according to the element PLOffsetfactor.

[0012] In the method performed by the user equipment, preferably, in the case that the configuration information of the selected random access resource contains the element PLOffsetfactor, the value of the path loss offset is determined according to the element PLOffsetfactor.

[0013] In the method performed by the user equipment, preferably, the transmission power of the PUSCH is calculated by the following formula 1,

[0014]

[0015] PL b，f，c (q d ) is set as the downlink path loss estimation value determined according to the reference signal plus the path loss offset, i.e. PL b，f，c (q d ) = PL b，f，c (qd) + k·PL offset, wherein the value of k is 1, 0, a positive number or a negative number, and the calculated P PUSCH，b，f，c (i, j, q d , l) is in the unit of dBm.

[0016] According to another aspect of the present application, a user equipment is provided, comprising: a processor; and a memory storing instructions, wherein the instructions, when executed by the processor, perform the method of any one of the above aspects.

[0017] Inventive Effects

[0018] According to the method and the corresponding user equipment, in the case that the UE receives a RAR scheduling an UL grant in a random access procedure and the UL grant corresponds to a PUSCH transmission, the UE can determine the corresponding path loss offset PL offset, so that the UE can use the correct power parameter to calculate the transmission power of the PUSCH, and the problem of excessive transmission power can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic diagram for explaining the case that the user equipment is configured with multiple transmission and reception nodes.

[0020] Figure 2 is a flow chart for explaining a method for determining transmission power to which the present application relates.

[0021] Figure 3 is a flow chart for explaining a four-step random access procedure.

[0022] Figure 4 is a flow chart for explaining a two-step random access procedure.

[0023] Figure 5 is a brief structural block diagram of a user equipment to which the present application relates. DETAILED DESCRIPTION

[0024] The present application will be described in detail by making reference to the accompanying drawings and specific embodiments. It should be noted that the present application should not be limited to the specific embodiments described below. In addition, for the sake of simplicity, detailed descriptions of well-known technology which is not directly related to the present application are omitted so as not to cause confusion in understanding the present application.

[0025] Before a specific description, several terms mentioned in the present application are explained as follows. Unless otherwise indicated, the terms involved in the present application have the following meanings.

[0026] UE: User Equipment, user equipment;

[0027] NR: New Radio, new radio technology;

[0028] LTE: Long Term Evolution, long term evolution technology;

[0029] eLTE: Enhanced Long Term Evolution, enhanced long term evolution technology;

[0030] RRC: Radio Resource Control, radio resource control (layer);

[0031] MAC: Medium Access Control, medium access control (layer);

[0032] MAC CE: MAC Control Element, MAC control element;

[0033] PHY: physical layer, physical layer;

[0034] RB: radio bearer, radio bearer;

[0035] DRB: Data Radio Bearer, data radio bearer;

[0036] SRB: Signalling Radio Bearer, signaling radio bearer;

[0037] TCI: Transmission Configuration Indicator, transmission configuration indicator;

[0038] RSRP: Reference Signal Received Power, reference signal received power;

[0039] PRACH: Physical Random Access Channel, physical random access channel;

[0040] RA: Random Access, random access;

[0041] RAR: Random Access Response, random access response;

[0042] TRP: Transmit / Receive Point, transmit / receive point;

[0043] SS: Synchronization Signal, synchronization signal;

[0044] PBCH: Physical Broadcast Channel, physical broadcast channel;

[0045] SSB: SS / PBCH block, synchronization signal / physical broadcast channel block;

[0046] CSI-RS: Channel State Information-Reference Signal, channel state information-reference signal;

[0047] HARQ: Hybrid Automatic Repeat Request, hybrid automatic repeat request;

[0048] PUCCH: Physical Uplink Control Channel, physical uplink control channel;

[0049] SRS: Sounding Reference Signal, sounding reference signal;

[0050] CSI: Channel-State Information, channel state information

[0051] PDCCH: Physical Downlink Control Channel, physical downlink control channel

[0052] PUSCH: Physical Uplink Shared Channel, physical uplink shared channel

[0053] UL grant: Uplink Grant, uplink grant

[0054] LTM: L1 / L2 Triggered Mobility, layer 1 / layer 2 triggered mobility

[0055] L1: Layer 1, layer 1

[0056] L2: Layer 2, layer 2

[0057] LTM Cell Switch Command, layer 1 / layer 2 triggered cell change command

[0058] DCI: Downlink Control Information, downlink control information

[0059] The related art of the present application is described below.

[0060] First, the random access procedure involved in determining the transmission power of the PUSCH is described.

[0061] The random access procedure includes a four-step random access procedure and a two-step random access procedure.

[0062] First, based on the following Figure 3 The four-step random access procedure in the prior art is described. As Figure 3 shown, when performing a 4-step random access procedure, the UE generally includes the following steps.

[0063] Step 300: The UE selects a random access resource for random access. In this process, the UE can select an SSB according to the measurement result of the SSB corresponding to the SS-RSRP, for example, select an SSB with a SS-RSRP higher than a preconfigured threshold value, then select a preamble corresponding to the selected SSB for transmission according to the selected SSB, and set the serial number corresponding to the selected preamble as the value of the parameter PREAMBLE_INDEX; and

[0064] - determine the next available PRACH occasion from the PRACH occasions.

[0065] Step 301: UE transmits the selected preamble on the determined PRACH occasion.

[0066] Step 302: UE receives the Random Access Response (RAR) sent from the base station side. In such a RAR, there is usually UL grant and Timing Advance Command.

[0067] If the preamble index id corresponding to the preamble sent by the UE in step 1 is carried in this RAR, the UE can determine that this RAR is sent to itself, and thus consider this Random Access Response reception successful.

[0068] The UE then processes the received Timing Advance Command, and indicates the preambleReceivedTargetPower to lower layers and indicates the amount of power ramping applied to the latest Random Access Preamble transmission to lower layers. Since the management control of random access is usually in the MAC layer, the lower layers here mainly refer to below the MAC layer, such as the physical layer, etc.

[0069] And the UE also needs to determine the power of the PUSCH transmission indicated or scheduled by the UL grant.

[0070] Step 303: UE transmits message 3 on the PUSCH resource indicated by the UL grant.

[0071] In this message 3, the UE carries the identification information for contention resolution.

[0072] Step 304: The UE receives the message 4 sent from the base station side.

[0073] If the UE carries the identification information carried in the message 3 in the message 4, the UE considers that the contention resolution is successful, and the random access procedure is completed successfully.

[0074] Since the UE undergoes the message passing process of steps 1-4 in the above random access procedure, it is called a "four-step random access" (4-step RA) procedure, and such a random access procedure is also called a contention based random access procedure (Contention based RA). In this paper, "four-step random access procedure" and "contention based random access procedure" can be replaced with each other.

[0075] In addition, there is also a "two-step random access" (2-step RA) procedure, also known as a contention free based random access procedure (Contention free based RA), which is usually triggered by the UE receiving a PDCCH order or started after the UE receiving a PDCCH order. It can also be triggered or started after receiving an LTM Cell switch MAC CE. In this paper, "two-step random access procedure" and "contention free based random access procedure" can be replaced with each other. The two-step random access procedure generally includes the following steps.

[0076] Step 400: The UE acquires a random access resource for random access. In this process, the UE can acquire the preamble index of the preamble for transmission from the PDCCH order or the LTM Cell switch MAC CE, so as to set the preamble index as the value of the parameter PREAMBLE_INDEX; and

[0077] determine the next available PRACH occasion from the PRACH occasions.

[0078] Step 401: The UE transmits the selected preamble on the determined PRACH occasion.

[0079] Step 402: The UE receives a random access response (RAR) sent by the base station side. The UL grant and the timing advance command (Timing Advance Command) are usually carried in such a RAR.

[0080] If the preamble index id corresponding to the preamble sent by the UE in step 1 is carried in this RAR, the UE can determine that the RAR is sent to itself, and thus consider this Random Access Response reception successful, and consider this random access procedure successful.

[0081] Then the UE processes the received Timing Advance Command, and indicates the preambleReceivedTargetPower to lower layers and indicates the amount of power ramping applied to the latest Random Access Preamble transmission to lower layers. Since the management control of random access is usually in the MAC layer, the lower layer here mainly refers to below the MAC layer, such as the physical layer, etc.

[0082] And the UE also needs to determine the power of the PUSCH transmission indicated by the UL grant. The UE can send uplink data on the UL grant.

[0083] Secondly, the synchronization broadcast block (SSB) involved in the random access procedure is described.

[0084] When the NR system works in high frequency bands, the base station often cannot send multiple beams covering the entire cell at the same time, so the beam scanning technology is introduced in the NR system to solve the problem of cell coverage.

[0085] Beam sweeping refers to that a base station transmits one or several beam directions at a time, and covers all directions of a cell by transmitting different beams at different times. The synchronization broadcast block set is designed for beam sweeping, and is used to transmit the primary synchronization signal, the secondary synchronization signal and the physical broadcast channel required by a UE to search for a cell in each beam direction. These signals form a synchronization broadcast block (SSB). The synchronization broadcast block set is a set of multiple synchronization broadcast blocks in a certain time period. Each synchronization broadcast block corresponds to a beam direction in the same period, and the beam directions of the synchronization broadcast blocks in a synchronization broadcast block set cover the entire cell. Therefore, in the random access process, the UE needs to determine the beam direction of random access, i.e., determine the SSB, when selecting a random access resource. In addition, the beam direction can also be represented by a CSI-RS, i.e., the beam direction corresponding to the CSI-RS.

[0086] In the multi-TRP scenario, it can be considered that there is a corresponding relationship between the TRP and the SSB or CSI-RS, or they are associated with each other. Here, the TRP can be an uplink or downlink TRP.

[0087] This corresponding relationship can be directly reflected in the RRC configuration information. For example, a set of SSB serial numbers is configured for a TRP, and these SSBs are associated with the TRP. For another example, a set of CSI-RSs is configured for a TRP, and these CSI-RSs are associated with the TRP.

[0088] This corresponding relationship can also be represented indirectly, such as by TCI states.

[0089] The UE detects PDCCH on the configured search space. The configuration information of each search space includes the information of the control resource set (CORESET) used by the search space. The control resource set provides frequency domain and time domain resource blocks. Each control resource set is associated with a series of TCI states. Each TCI state contains at least the information of an SSB or a CSI-RS. The control resource sets used for the same search space can be numbered by coresetPoolIndex, where the number 0 can correspond to the first TRP, the number 1 can correspond to the second TRP, and so on. Therefore, the configuration of the TCI state of the resource set can correspond to the TRP corresponding to the resource set, and thus the corresponding relationship between the TRP and the SSB or CSI-RS is formed.

[0090] In the present application, network, base station and RAN can be used interchangeably, and the network can be a long term evolution (LTE) network, a new radio access technology (NR) network, an enhanced long term evolution (eLTE) network, or other networks defined in subsequent evolution versions of 3GPP.

[0091] In addition, "associated" and "corresponding" can be replaced with each other in the present disclosure.

[0092] In the present disclosure, "determining the path loss offset" and "determining the value of the path loss offset" can be replaced with each other.

[0093] The following will list specific embodiments to illustrate the processing method of the present application.

[0094] Embodiment 1

[0095] In order to perform PUSCH transmission, the UE needs to determine the transmission power of the PUSCH. In the process of determining the transmission power, the UE can determine the path loss offset used to calculate the transmission power in the following ways:

[0096] First, the determination of the transmission power of the PUSCH not involving the random access process is described.

[0097] In this case, the UE is configured with more than one uplink TCI state, then the UE can determine the path loss offset (PL offset) according to the TCI state associated with the PUSCH. The specific determination method can be:

[0098] For example, the serial number of the TCI state configured by the UE is 1, and the configuration information of the TCI state also contains an information element (IE) PLOffsetfactor related to the value of the path loss offset (PL offset). Then it can be considered that this TCI state has an associated path loss offset (PL offset). In addition, if the configuration information of the TCI state does not contain PLOffsetfactor, then it can be considered that this TCI state does not have an associated path loss offset (PL offset).

[0099] When the UE receives a DCI in which a PUSCH transmission is indicated and the TCI state for the transmission is a TCI state with a sequence number of 1, the UE can determine a path loss offset based on the TCI state, and the determined path loss offset is the path loss offset associated with the TCI state. In addition, if there is no associated path loss offset, the UE can consider the path loss offset to be zero, or the path loss offset does not need to be considered when calculating the PUSCH transmission power.

[0100] The value of the path loss offset can be obtained according to the information element PLOffsetfactor.

[0101] The value of the PLOffsetfactor can correspond to the value of a specific path loss offset (PL offset), and the correspondence can be

[0102] 1) It can be considered that the value of the path loss offset (PL offset) required when calculating the PUSCH power is equal to the value of the PLOffsetfactor;

[0103] 2) It can also be considered that the value of the path loss offset (PL offset) required when calculating the PUSCH power is equal to the value of the PLOffsetfactor multiplied by a predetermined parameter,

[0104] 3) It can also be considered that the value of the path loss offset (PL offset) required when calculating the PUSCH power is equal to the value obtained by calculating a function with the value of the PLOffsetfactor as a parameter or variable.

[0105] The value of the PLOffsetfactor can also be a sequence number or index, which corresponds to a value in a list containing multiple path loss offset PL offset values, so that the value of the corresponding path loss offset PL offset can be determined according to the sequence number.

[0106] In addition, the association between the path loss offset PL offset and the TCI state can also be

[0107] For example, a TCI state configured for the UE has a serial number of 1, and the TCI state with the serial number of 1 belongs to a TCI state group, the TCI state group contains one or more TCI states, and the configuration of the TCI state group contains a PLOffsetfactor information element related to the path loss offset PL offset. It can be considered that the path loss offset PL offset is associated with the TCI state group, and further considered that the path loss offset is associated with each TCI state in the group. Since the TCI state with the serial number of 1 belongs to the TCI state group, it can be determined that the path loss offset PL offset associated with the TCI state with the serial number of 1 is the path loss offset PL offset associated with the TCI state group.

[0108] The transmission of the PUSCH is performed on the associated TCI state. After determining the path loss offset according to the TCI state, the UE can use the path loss offset to calculate the transmission power of the PUSCH.

[0109] Secondly, the determination of the transmission power of the PUSCH related to the random access procedure is described.

[0110] In this case, the PUSCH is scheduled by the RAR, or the PUSCH is scheduled or indicated by the UL grant in the RAR. The following method can be used to determine the path loss offset.

[0111] Referring to Figure 2 , the method performed by the user equipment of the present application comprises the following steps:

[0112] Step 201: The user equipment receives a random access response RAR sent by the base station side, and the random access response RAR schedules a PUSCH;

[0113] Step 202: Determine the path loss offset used to calculate the transmission power of the PUSCH; and

[0114] Step 203: Calculate the transmission power of the PUSCH based on the determined path loss offset.

[0115] In the following, the process of the method performed by the user equipment described above Figure 2 is described in detail.

[0116] As mentioned before, the random access procedure contains both the four-step random access procedure and the two-step random access procedure, therefore, accordingly, the following will distinguish the two random access procedures to explain. Among them, case one and case two below consider the two-step random access procedure, and case three considers the four-step random access procedure.

[0117] Case one, the RAR containing the UL grant scheduling or indicating the PUSCH is received by the UE in the random access procedure, and the random access procedure is triggered by the PDCCH order. If the PDCCH order directly or indirectly contains or carries the information element PLOffsetfactor related to the value of the path loss offset PL offset, then as mentioned before, the value of the path loss offset can be obtained according to the information element PLOffsetfactor.

[0118] Another way can be that the PDCCH order triggering the random access also carries the TCI state, as mentioned before, according to the information of the TCI state, the UE can determine the path loss offset (PL offset).

[0119] Or in the PDCCH order triggering the random access also carries the SSB index, the UE can determine the path loss offset (PL offset) according to the information of the SSB index. The specific method can be as follows.

[0120] For example, corresponding to the SSB with index 1, its configuration information also contains the information element PLOffsetfactor related to the value of the path loss offset (PL offset), then it can be considered that there is a path loss offset (PL offset) associated with the SSB. In addition, if the configuration information of the SSB does not contain PLOffsetfactor, then it can be considered that there is no path loss offset (PL offset) associated with the SSB.

[0121] When the UE receives the PDCCH order carrying the SSB index 1, then the UE can determine the path loss offset based on the SSB index, and the determined path loss offset is the path loss offset associated with the SSB indicated by the SSB index. The value of the path loss offset can be obtained according to the information element PLOffsetfactor. The specific way is as mentioned before.

[0122] As a supplement, if such PDCCH order does not carry PLOffsetfactor or does not carry TCI state that can be used to determine PL offset, or the SSB index carried in PDCCH order does not correspond to SSB associated with PL offset, in such case UE can set the value of the path loss offset to zero, or not consider the path loss offset when calculating the PUSCH power.

[0123] Case two, the RAR containing the UL grant scheduling or indicating the PUSCH is received by the UE in a random access procedure, and the random access procedure is triggered by LTM Cell switch MAC CE. If such LTM Cell switch MAC CE directly or indirectly contains or carries the information element PLOffsetfactor related to the value of the path loss offset PL offset, as described above, the value of the path loss offset can be obtained according to the information element PLOffsetfactor.

[0124] Another way can be that the LTM Cell switch MAC CE triggering the random access also carries the TCI state, as described above, according to the information of the TCI state, the UE can determine the path loss offset PL offset

[0125] Or in the LTM Cell switch MAC CE triggering the random access also carries the SSB index, as described above, according to the SSB index, the path loss offset (PL offset) can be determined according to the information of the SSB index.

[0126] As a supplement, if the LTM Cell switch MAC CE does not carry PLOffsetfactor or does not carry TCI state that can be used to determine PL offset, or the SSB index carried does not correspond to SSB associated with PL offset, in such case UE can set the value of the path loss offset to zero, or not consider the path loss offset when calculating the PUSCH power.

[0127] If the LTM Cell switch MAC CE always carries the PLOffsetfactor, in order to indicate the case that the PL offset does not need to be considered, a specific value of the PLOffsetfactor can be set. When the UE receives the LTM Cell switch MAC CE, and the PLOffsetfactor contained in the LTM Cell switch MAC CE is the specific value, the UE can set the value of the path loss offset to zero, or not consider the path loss offset when calculating the PUSCH power.

[0128] Case three, the RAR containing the UL grant scheduling or indicating the PUSCH is received by the UE in the random access procedure, and the random access procedure is the contention based four-step random access. Then the UE can determine the path loss offset in the PUSCH transmission according to the selected random access resource. Specifically, the configuration information of the random access resource received by the UE can also contain the information element PLOffsetfactor related to the value of the path loss offset PL Offset. Then it can be considered that the random access resource has the path loss offset PL Offset associated therewith, and the UE can determine the information element PLOffsetfactor according to the random access resource. Further, according to the PLOffsetfactor, the value of the path loss offset can be determined. The determined value of the path loss offset is the path loss offset associated with the random access resource.

[0129] Embodiment 2

[0130] In the embodiment 1, the "UE can set the value of the path loss offset to zero, or not consider the path loss offset when calculating the PUSCH power", the PUSCH power calculation method not considering the path loss offset can be performed according to the existing technology PUSCH transmission power calculation formula. The specific formula can refer to the formula for calculating the PUSCH transmission power in the seventh chapter, section two of the existing technology 3rd Generation Partnership Project (3GPP) Technical Specification (TS) 38.231 version number v18.0.0, as follows:

[0131]

[0132] The meanings of the letters in the above formula can refer to the above technical specification.

[0133] wherein PL b，f，c (q d) is a downlink pathloss estimate, which is calculated by the UE according to a determined reference signal (RS).

[0134] After the UE determines the pathloss offset according to the scheme in Embodiment 1, one feasible method for the UE to calculate the PUSCH transmission power is to calculate the PUSCH transmission power according to the above formula (formula 1), but for PL b，f，c (q d ), which can be set to the downlink pathloss estimate value determined according to the reference signal plus the determined pathloss offset, i.e. b，f，c (q d ) = PL b，f，c (q d ) + k.PLoffset, where k can be 1 or 0, and can be positive or negative.

[0135] Another feasible way is to modify the above formula, for example, add a variable / parameter PL offset representing the pathloss offset in formula 1, as shown in the following formula 2, then the UE can substitute the PL offset determined according to the scheme in Embodiment 1 into the following formula 2 for calculation. Where k can be 1 or 0, and can be positive or negative. Or other modifications of formula 1 containing PL offset variable.

[0136]

[0137] Embodiment 3

[0138] In the aforementioned LTM Cell switch MAC CE mentioned in the embodiments, when the UE receives the MAC CE, it will start a random access process initiated by the target cell. In this process, if the LTM Cell switch MAC CE contains or carries the information element PLoffsetfactor related to the value of PL Offset, the PLoffsetfactor can also be used to determine the value of the pathloss offset to be used in the calculation of the PRACH transmission power.

[0139] The value of the pathloss offset can be obtained according to the information element PLoffsetfactor.

[0140] The value of the above PLoffsetfactor can correspond to the value of the specific pathloss offset (PL offset), and the corresponding method can be

[0141] 1) It can be considered that the value of the path loss offset (PL offset) required when calculating the PUSCH power is equal to the value of PLOffsetfactor;

[0142] 2) It can also be considered that the value of the path loss offset (PL offset) required when calculating the PUSCH power is equal to the value of PLOffsetfactor multiplied by a predetermined parameter,

[0143] 3) It can also be considered that the value of the path loss offset (PL offset) required when calculating the PUSCH power is equal to the value obtained by calculating a function with PLOffsetfactor as a parameter or variable.

[0144] The value of PLOffsetfactor can also be an index or a serial number, which corresponds to a value in a list containing multiple path loss offset values PL offset, so that according to the index, the corresponding path loss offset value PL offset can be determined.

[0145] The specific formula for the power of sending PRACH can refer to the formula for calculating the transmission power of PRACH in the seventh chapter, section four of the third generation partnership project (3rd Generation Partnership Project, 3GPP) technical specification (Technical Specification, TS) 38.231 version number v18.0.0, as follows:

[0146] P PRACH，b，f，c (i) = min{P CMAX，f，c (i), P PRACH，target，f，c + PL b，f，c}[dBm]

[0147] Formula 3

[0148] The meanings of the letters in the above formula can be referred to the above technical specification.

[0149] Where PL b，f，c (q d ) is the downlink path loss estimate, which is calculated by the UE according to the determined reference signal (RS).

[0150] After the UE determines the path loss offset according to the foregoing scheme, a feasible method for calculating the PRACH transmission power is to calculate the transmission power of PRACH according to the above formula (formula 3), but for PLb，f，c (q d ), which can be obtained based on the PL offset, for example, set as the downlink loss estimation value determined according to the reference signal plus the determined loss offset, i.e., PL b，f，c (q d ) = PL b，f，c (q d ) + k PL offset, where k can be 1 or 0, and can be positive or negative.

[0151] Another possible way is to modify the above formula 3, for example, add a variable / parameter PL offset in formula 3, as shown in the following formula 4, then the UE can substitute the determined PL offset into the following formula 4 for calculation. Where k can be 1 or 0, and can be positive or negative.

[0152] Or other modifications of formula 3 containing PL offset variable.

[0153] P PRACH，b，f，c (i) = min{P CMAX，f，c (i), P PRACH，target，f，c + PL b，f，c + k PL offset} [dBm]

[0154] ------Formula 4

[0155] The present embodiment can be combined with the foregoing embodiments to determine the transmission power of PRACH and PUSCH, or implemented alone to determine the transmission power of PRACH.

[0156] Figure 5 is a brief block diagram of the user equipment involved in the present application.

[0157] As Figure 5 shown, the user equipment 500 at least includes a processor 501 and a memory 502. The processor 501 may, for example, include a microprocessor, a microcontroller, an embedded processor, etc. The memory 502 may, for example, include a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memory systems, etc. The memory 502 stores program instructions thereon. When the instructions are run by the processor 501, one or several steps in the processing method of the UE of the present disclosure can be executed.

[0158] The method and apparatus according to the present disclosure have been described above in connection with preferred embodiments. Those skilled in the art will understand that the method shown above is merely exemplary, and the embodiments described above can be combined with each other without contradiction. The method of the present disclosure is not limited to the steps and order shown above.

[0159] In the embodiments of the present disclosure, in the case of containing multiple operations, the embodiments of the present disclosure exemplarily list the execution order of each operation, and the embodiments obtained by changing the execution order of each operation are also within the protection scope of the present disclosure. In addition, in the case of containing multiple judgment conditions, the embodiments obtained by changing the execution order of each judgment condition are also within the protection scope of the present disclosure. In addition, in the present disclosure, if not specifically stated, the meaning of the field defined in one embodiment can also be applied to the corresponding field involved in other embodiments. In addition, in the embodiments of the present disclosure, “if”, “when”, “when”, “when”, “if”, or “if” can be replaced by “in the case of”.

[0160] The user equipment shown above can include more modules, for example, modules that can be developed or will be developed in the future, which can be used for base stations, MMEs, or UEs, and the like. The various identifiers shown above are only exemplary and not restrictive, and the present disclosure is not limited to the specific information elements as examples of these identifiers. Those skilled in the art can make many changes and modifications according to the teachings of the embodiments shown.

[0161] It should be understood that the above embodiments of the present disclosure can be realized by software, hardware, or a combination of software and hardware. For example, various components inside the base station and user equipment in the above embodiments can be realized by various devices, including but not limited to: analog circuit devices, digital circuit devices, digital signal processing (DSP) circuits, programmable processors, application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), programmable logic devices (CPLDs), and the like.

[0162] In addition, the program running on the apparatus according to the present disclosure can be a program that controls the central processing unit (CPU) to enable the computer to implement the functions of the embodiments of the present disclosure. The program or information processed by the program can be temporarily stored in a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memory systems. In addition, the program can also be transmitted, distributed and downloaded in the form of a signal through the Internet.

[0163] The programs for realizing the functions of the embodiments of the present application can be recorded on a computer-readable recording medium. The corresponding functions can be realized by causing a computer system to read the programs recorded on the recording medium and execute the programs. The so-called "computer system" herein can be a computer system embedded in the device and can include an operating system or hardware such as a peripheral device. The "computer-readable recording medium" can be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a short-time dynamic storage program recording medium, or any other computer-readable recording medium.

[0164] The various features or function modules of the device used in the above-described embodiments can be realized or executed by a circuit (e.g., a single-chip or multi-chip integrated circuit). The circuit designed to perform the functions described in the present specification can include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gates or transistor logic, discrete hardware components, or any combination thereof. The general-purpose processor can be a microprocessor, but can also be any existing processor, controller, microcontroller, or state machine. The above-described circuit can be a digital circuit, but can also be an analog circuit. In the case where new integrated circuit technologies are developed as a result of the advancement of semiconductor technologies, one or more embodiments of the present application can also be implemented using such new integrated circuit technologies.

[0165] Furthermore, the present application is not limited to the above-described embodiments. Although various examples of the embodiments have been described, the present application is not limited thereto. Fixed or non-mobile electronic devices installed indoors or outdoors can be used as terminal devices or communication devices, such as AV devices, kitchen devices, cleaning devices, air conditioners, office devices, automatic vending machines, and other home appliances.

[0166] As described above, the embodiments of the present application have been described in detail with reference to the accompanying drawings. However, the specific configuration is not limited to the above-described embodiments, and the present application includes any design modification without departing from the gist of the present application. In addition, various modifications can be made to the present application within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the different embodiments are also included in the technical scope of the present application. Furthermore, components described in the above-described embodiments having the same effect can be substituted for each other.

Claims

1.A method performed by a user equipment, comprising the steps of: receiving, by the user equipment, a random access response (RAR) transmitted by a base station, the random access response (RAR) scheduling a PUSCH; determining a path loss offset for calculating a transmission power of the PUSCH; and calculating the transmission power of the PUSCH based on the determined path loss offset. 2.The method performed by a user equipment according to claim 1, wherein, in a case that a random access procedure involved by the random access response (RAR) is a two-step random access procedure, the path loss offset is determined according to a PDCCH order or a LTM Cell switch MAC CE triggering the random access procedure. 3.The method performed by a user equipment according to claim 1, wherein, in a case that a random access procedure involved by the random access response (RAR) is a four-step random access procedure, the path loss offset is determined according to a selected random access resource. 4.The method performed by a user equipment according to claim 2, wherein, in a case that the PDCCH order or the LTM Cell switch MAC CE contains or carries an information element (IE) PLOffsetfactor, a value of the path loss offset is determined according to the IEPLOffsetfactor. 5.The method performed by a user equipment according to claim 2, wherein, in a case that the PDCCH order or the LTM Cell switch MAC CE carries a TCI state and the TCI state contains an IEPLOffsetfactor in configuration information of the TCI state, a value of the path loss offset is determined according to the IEPLOffsetfactor. 6.The method performed by a user equipment according to claim 2, wherein, in a case that the PDCCH order or the LTM Cell switch MAC CE carries an SSB index and the SSB index contains an IEPLOffsetfactor in configuration information of the SSB index, a value of the path loss offset is determined according to the IEPLOffsetfactor. 7.The method performed by a user equipment according to claim 3, wherein, in a case that the selected random access resource contains an IEPLOffsetfactor in configuration information of the random access resource, a value of the path loss offset is determined according to the IEPLOffsetfactor. 8.The method performed by a user equipment according to any one of claims 1 to 7, wherein, the transmission power of the PUSCH is calculated by the following formula 1, 9.A user equipment, comprising: a processor; and a memory storing instructions, wherein the instructions, when executed by the processor, perform the method according to any one of claims 1 to 8. ​ ​ ​ PL b，f，c (q d ) is set to a downlink loss estimate determined from a reference signal plus the loss offset, i.e. PL b，f，c (q d ) = PL b，f，c (q d ) + k - PLoffset, where k has a value of 1, 0, positive or negative, and the calculated P PUSCH，b，f，c (i, j, q d , l) is in units of dBm. ​ ​ ​ ​ ​

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