Method executed by user equipment, and user equipment

Abstract

Provided in the present disclosure are a method executed by a user equipment, and a user equipment. The method executed by a user equipment (UE) comprises: a UE initiating a random access procedure; when the UE determines that the initiated random access procedure is a random access procedure triggered by a first physical downlink control channel order (PDCCH order) and oriented to an LTM candidate cell, and the first PDCCH order indicates a first transmission of a preamble sequence, setting the value of a first variable to be equal to 1; when the UE determines that the initiated random access procedure is a random access procedure triggered by a second PDCCH order and oriented to an LTM candidate cell, the second PDCCH order indicates a retransmission of the preamble sequence, and the candidate cell indicated in the second PDCCH order is different from the candidate cell indicated in the first PDCCH order, setting the value of the first variable to be equal to 1; and the UE calculating a second variable on the basis of the value of the first variable, the UE instructing a physical layer to send a random access preamble sequence by means of using the second variable, and, upon the UE determining that the initiated random access procedure is a random access procedure triggered by the PDCCH orders and oriented to the LTM candidate cells, considering that the random access procedure is completed.

Description

Method performed by user equipment and user equipment Technical Field

[0001] The present disclosure relates to the technical field of wireless communications, and in particular to a method executed by a user equipment and corresponding user equipment. Background Art

[0002] When a UE in an RRC connected state moves from the coverage area of ​​one cell to the coverage area of ​​another cell, in order to ensure service continuity, the base station or the network side usually instructs the UE to perform a cell switch (Cell Switch / Cell Handover) operation. The switch in the prior art is triggered by RRC signaling, that is, when the UE receives an RRC reconfiguration message carrying a synchronization identifier (here referred to as a layer 3 handover command), it will synchronize to the target cell specified in the message. The period from receiving the layer 3 handover command to completing synchronization with the target cell is called the handover delay. In the handover delay, the period of time during which the UE initiates random access in the target cell to obtain uplink synchronization accounts for a large proportion of the handover delay.

[0003] To shorten uplink synchronization time, one feasible approach is to configure one or more candidate cells for the UE before the base station or network instructs the UE to perform a cell handover. Before performing a handover, the UE can perform uplink synchronization on one or more candidate cells to obtain the transmission timing advance for uplink synchronization. This can be achieved by the UE sending a preamble sequence to the candidate cell. The UE receives a PDCCH order from the serving cell, which triggers the UE to send a preamble sequence to the candidate cell.

[0004] In the random access process of sending a preamble sequence to a candidate cell, the UE only needs to send the preamble sequence once, and the random access process can be considered completed. In such a simplified random access process, since the preamble sequence is only sent once, if the base station to which the target candidate cell belongs does not successfully receive the preamble sequence, the UE cannot gradually increase the power as in the traditional random access process until the base station successfully receives it. Therefore, a possible solution is for the base station of the serving cell to continue to send a PDCCH order to the UE, instructing the UE to retransmit the preamble sequence for the same candidate cell. The power used for the retransmitted preamble sequence is increased based on the power used for the previous preamble sequence transmission. The specific implementation can be to add 1 to the value of the variable PREAMBLE_POWER_RAMPING_COUNTER, and then use this variable to calculate the power value that needs to be sent, so as to achieve the purpose of power increase.

[0005] However, between two PDCCH orderers transmitting preamble sequences for the same candidate cell, the UE may spontaneously perform a random access procedure, for example, a random access procedure triggered by a scheduling request. Currently, when a random access procedure is triggered, all related variables are reset to their initial values, including the aforementioned variable PREAMBLE_POWER_RAMPING_COUNTER. However, after the random access procedure is completed, the values ​​of these variables are not cleared, but are reset until the next random access procedure is triggered.

[0006] The problem this brings is that the value of the variable PREAMBLE_POWER_RAMPING_COUNTER is assigned by the new random access process. If the random access process of the preamble sequence transmission for the same candidate cell occurs continuously, then the value assigned to PREAMBLE_POWER_RAMPING_COUNTER after the previous transmission can be used in the next preamble sequence retransmission for the same candidate cell, thereby achieving power boosting. However, once a new random access process is performed between the two, the value assigned to this variable will be meaningless for the subsequent random access process for the candidate cell. Therefore, how to manage the value of this variable so that it can be used correctly in subsequent transmissions is a problem that needs to be solved.

[0007] Summary of the Invention

[0008] The purpose of the present disclosure is to provide a method performed by a user equipment and the user equipment.

[0009] According to a first aspect of the present invention, a method performed by a user equipment (UE) is provided, comprising: the UE initiating a random access procedure; the UE setting a value of a preamble power variable based on whether the initiated random access procedure is a random access procedure for an LTM candidate cell triggered by a physical downlink control channel command (PDCCH order); before transmitting a preamble sequence, the UE performing a calculation to increase the value of the preamble power variable by 1; and the UE calculating a target received power of the preamble sequence based on the calculated preamble power variable.

[0010] In the method of the first aspect above, preferably, the preamble power variable may be a variable PREAMBLE_POWER_RAMPING_COUNTER.

[0011] In the method of the first aspect above, preferably, when the random access procedure started is not a random access procedure for an LTM candidate cell triggered by a PDCCH order, the UE sets the value of the preamble power variable to be equal to 1.

[0012] In the method of the first aspect above, preferably, when the random access process initiated is a random access process for an LTM candidate cell triggered by a PDCCH order and indicates the first transmission of a preamble sequence, or indicates non-retransmission, the UE sets the value of the preamble sequence power variable to be equal to 1.

[0013] In the method of the first aspect above, preferably, when the random access procedure initiated is not a random access procedure for an LTM candidate cell triggered by a PDCCH order indicating preamble retransmission, the UE sets the value of the preamble power variable to 1.

[0014] In the method of the first aspect above, preferably, when the random access procedure initiated is a random access procedure for an LTM candidate cell triggered by a PDCCH order and indicates retransmission of the preamble sequence, the UE sets the value of the preamble sequence power variable to be equal to the intermediate variable TEMP-POWER CONTER.

[0015] In the method of the first aspect above, preferably, the preamble power variable may be a variable PREAMBLE_POWER_RAMPING_COUNTER-LTM.

[0016] In the method of the first aspect above, preferably, when the preamble power variable is the variable PREAMBLE_POWER_RAMPING_COUNTER-LTM, when the random access procedure initiated is a random access procedure for an LTM candidate cell triggered by a PDCCH order, the UE sets the value of the preamble power variable to be equal to 1.

[0017] In addition, according to a second aspect of the present invention, a user equipment is provided, comprising: a processor; and a memory storing instructions, wherein the instructions execute the method described above when executed by the processor.

[0018] Effects of the Invention

[0019] According to the method performed by the user equipment and the user equipment disclosed in the present invention, the values ​​of variables related to the preamble sequence power (such as the variable PREAMBLE_POWER_RAMPING_COUNTER or the variable PREAMBLE_POWER_RAMPING_COUNTER-LTM) can be effectively managed so that they are correctly used in subsequent transmissions, thereby enabling efficient communication with the base station device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other features of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0021] FIG1 is a flow chart schematically showing a method executed by a user equipment UE according to embodiment 1 of the present invention.

[0022] FIG2 is a block diagram showing a schematic structure of a user equipment according to the present disclosure.

[0023] It should be noted that the drawings are not necessarily drawn to scale, emphasis instead being placed on illustrating the principles of the technology disclosed herein. In addition, for clarity, like reference numerals throughout the drawings refer to like elements. DETAILED DESCRIPTION

[0024] The present disclosure is described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the present disclosure is not limited to the specific embodiments described below. In addition, for the sake of simplicity, detailed descriptions of known technologies that are not directly related to the present disclosure are omitted to prevent confusion in understanding the present disclosure.

[0025] Before the detailed description, some terms mentioned in this disclosure are explained as follows. Unless otherwise specified, the terms involved in this disclosure have the following meanings.

[0026] UE User Equipment

[0027] RLF Radio Link Failure

[0028] NR New Radio Next Generation Wireless Technology

[0029] LTE Long Term Evolution

[0030] Elte Enhaced Long Term Evolution

[0031] RRC Radio Resource Control

[0032] PDCP Packet Data Convergence Protocol Packet Data Convergence Protocol (layer)

[0033] RLC Radio Link Control, radio link control (layer)

[0034] MAC Medium Access Control (layer)

[0035] PHY physical layer

[0036] MAC CE Medium Access Control Control Element Media Access Control Layer Control Element

[0037] PDU Protocol Data Unit

[0038] UE User Equipment

[0039] NR New Radio Next Generation Wireless Technology

[0040] HARQ Hybrid Automatic Repeat reQuest Hybrid Automatic Repeat reQuest

[0041] DCI Downlink Control Information Downlink control information

[0042] SRB signaling radio bear

[0043] SS Synchronization Signal

[0044] PBCH Physical Broadcast Channel Physical Broadcast Channel

[0045] SSB SS / PBCH block Synchronous broadcast block

[0046] CSI-RS Channel State Information-Reference Signal Channel State Information Reference Signal

[0047] RSRP Reference Signal Received Power Reference signal received power

[0048] PRACH Physical Random Access Channel

[0049] PDCCH Physical Downlink Control Channel

[0050] PUCCH Physical Uplink Control Channel Physical uplink control channel

[0051] PUSCH Physical Uplink Shared Channel Physical Uplink Shared Channel

[0052] RACH Random Access Channel

[0053] LTM (Layer 1 / Layer 2-triggered mobility, L1 / L2 triggered mobility)

[0054] LTM refers to the UE performing mobility operations upon receiving Layer 1 / Layer 2 signaling. Layer 1 / Layer 2 signaling refers to signaling for cell handover, which carries or indicates information about the target cell. The UE changes its serving cell by applying or executing the configuration information of the target cell.

[0055] The target cell here refers to the cell that will replace the current serving cell and provide services to the UE. The serving cell that provided services to the UE before receiving the handover signaling is called the source cell. That is, after receiving the handover signaling, the UE switches from the source cell to the target cell, which continues to provide services to the UE. The UE's mobility results in a serving cell change (switching), which is triggered by a L1 or L2 command or information indication.

[0056] The handover and cell change involved in this article are mainly the handover and cell change triggered by the LTM mentioned above.

[0057] LTM Candidate Cell(s)

[0058] Before executing LTM, the UE will be configured with one or more candidate cells, one of which will become the target cell for LTM. The base station provides the UE with configuration information for these candidate cells, which can be in the form of cell group configuration information. These candidate cells are numbered or sorted, with each number or sequence corresponding to a candidate cell, or in other words, the configuration information of a candidate cell can be determined. The configuration information for each candidate cell can include at least the cell's identification information, such as the cell's physical cell ID (PCID) or cell ID, and can also include the cell's channel configuration, such as the time and frequency information of the PRACH channel.

[0059] preamble

[0060] During a random access procedure, the UE sends a preamble on the transport channel (RACH). This operation can also be considered a PRACH transmission, where PRACH is the physical layer random access channel, and its corresponding transport layer channel is RACH. The sent preamble is received by the base station. Since the base station can control the coverage of one or more cells, such a PRACH transmission is performed on one of the cells under the base station's control.

[0061] In order to implement PRACH transmission, the UE needs to determine the PRACH channel of the target cell for the transmission, as well as the preamble sequence to be used and the transmit power of the preamble sequence.

[0062] PDCCH order-triggered random access process for candidate cells

[0063] This is a command received by the UE from the base station or the network side. This command can trigger the UE to initiate a random access process, which is performed in the candidate cell.

[0064] Alternatively, the command is a command instructing the UE to send (or transmit) a preamble sequence to the candidate cell, or a command instructing the UE to send a PRACH.

[0065] The candidate cell here mainly refers to the candidate cell for LTM. Since the random access procedure triggered by this command will be performed on this candidate cell, it can be considered that this candidate cell is the target cell for the random access procedure to be performed, or the target cell to which the UE needs to send a preamble sequence / PRACH.

[0066] The candidate cell here is not the target cell of the handover, but a candidate cell that can be used as the target cell of the handover.

[0067] The candidate cell here is not a target cell when executing synchronous reconfiguration (execute reconfiguration with sync.), but a candidate cell that can be used as a target cell for executing synchronous reconfiguration in the future.

[0068] There may be one or more candidate cells. Each time the UE receives the above command, it performs random access or sends a preamble sequence / PRACH on the indicated candidate cell. The command indicates at least one candidate cell. If more than one candidate cell is indicated in the command, the UE needs to perform random access or send a preamble sequence on the indicated candidate cell or send a preamble sequence on the PRACH channel of the candidate cell.

[0069] The base station can send this command to the UE in the form of DCI (Downlink Control Information). Since the content of the DCI is transmitted on the PDCCH channel, such a command is called a PDCCH order. The PDCCH order (or the DCI indicating this command) can also indicate information about the candidate cell, such as the index or identity of the cell configuration information of the candidate cell, or the identification information corresponding to a candidate cell configuration. This allows the UE to determine that this is a random access procedure performed on a candidate cell.

[0070] In addition, the PDCCH order may also indicate at least one of the following information:

[0071] Random access resource information: may include frequency information for determining a PRACH channel and / or time information for determining a PRACH channel;

[0072] Random Access Preamble index: The preamble sequence corresponding to this number will be used for the triggered random access process, or the preamble sequence sent to the candidate cell;

[0073] Carrier type: indicates whether the RACH channel is located on the primary carrier or the secondary carrier;

[0074] SS / PBCH index: indicates the number used to determine the RACH occasion.

[0075] In addition, the PDCCH order may also indicate information for determining the initial transmission (initial transmission) or retransmission (retransmission, which may be the second, third, or fourth transmission, etc.) of the preamble sequence.

[0076] In the existing mechanism, there is also a PDCCH order for triggering the random access process, but the random access process triggered in this way is for the UE's current serving cell. That is, when receiving such a PDCCH order, the UE will send a preamble sequence on the PRACH of its designated serving cell. In addition to sending the preamble sequence, the UE also needs to receive a random access response in the random access process triggered in this way, which is different from the random access for candidate cells.

[0077] Because the random access procedure for candidate cells can only be triggered by a PDCCH order in the prior art, the term "random access procedure for candidate cells triggered by a PDCCH order" in this document can be replaced by "random access procedure for candidate cells." If the "random access procedure for candidate cells" can be triggered by other methods later, the solution in this document will also apply. For example, the UE may receive an RRC message or a MAC CE indicating that the UE has triggered the random access procedure for candidate cells.

[0078] In this article, the terms associated, corresponding, and relevant can be used interchangeably.

[0079] Since the UE needs to perform uplink or downlink synchronization (synchronization, sync) operations on the target cell when performing a cell change (Cell Switch), "cell change" in this article can also be replaced by "cell synchronization", that is, the switching command can be a message or indication instructing the UE to synchronize with the target cell.

[0080] The method executed by the user equipment of the present disclosure is described below with reference to embodiments.

[0081] Example 1

[0082] FIG1 is a flow chart schematically showing a method performed by a user equipment UE according to Embodiment 1 of the present invention. As shown in FIG1 , the embodiment may include the following steps:

[0083] Step S1: UE initiates (initial) a random access procedure.

[0084] Step S2: During initialization, the UE sets variables related to the preamble power.

[0085] As an example, a variable related to the preamble power may be a variable PREAMBLE_POWER_RAMPING_COUNTER. For example, the variable may be set as follows:

[0086] In one case, if the random access procedure currently initiated by the UE is not a random access procedure for an LTM candidate cell triggered by a PDCCH order, the UE sets the value of PREAMBLE_POWER_RAMPING_COUNTER to 1;

[0087] In one case, the random access procedure currently being initiated by the UE is a random access procedure for an LTM candidate cell triggered by a PDCCH order, and indicates the first transmission (or initial transmission) of the preamble sequence, or indicates non-retransmission, then the UE sets the value of PREAMBLE_POWER_RAMPING_COUNTER to 1;

[0088] In one case, the random access procedure currently initiated by the UE is not a random access procedure for an LTM candidate cell triggered by a PDCCH order indicating preamble retransmission (i.e., retransmission), then the UE sets the value of PREAMBLE_POWER_RAMPING_COUNTER to 1;

[0089] In one case, the random access procedure currently initiated by the UE is a random access procedure for an LTM candidate cell triggered by a PDCCH order and indicates retransmission of the preamble sequence, then the UE sets the value of PREAMBLE_POWER_RAMPING_COUNTER to be equal to the intermediate variable TEMP-POWER CONTER.

[0090] Then, in the random access procedure, the UE may perform the following operations before transmitting the preamble sequence:

[0091] -Increment PREAMBLE_POWER_RAMPING_COUNTER by 1, ie, PREAMBLE_POWER_RAMPING_COUNTER=

[0092] PREAMBLE_POWER_RAMPING_COUNTER+1

[0093] -Calculate the target received power of the preamble sequence, using the above variable PREAMBLE_POWER_RAMPING_COUNTER in the calculation.

[0094] The specific formula used to calculate the transmission power based on the variable PREAMBLE_POWER_RAMPING_COUNTER can refer to the formula for calculating the target received power PREAMBLE_RECEIVED_TARGET_POWER of the preamble sequence in Section 1, Section 3 of Chapter 5 of the existing 3rd Generation Partnership Project (3GPP) Technical Specification (TS) 38.321 version v17.2.0, which is excerpted as follows:

[0095] PREAMBLE_RECEIVED_TARGET_POWER=preambleReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_POWER_RAMPING_COUNTER-1)×PREAMBLE_POWER_RAMPING_STEP+POWER_OFFSET_2STEP_RA

[0096] For the meaning of each letter in the above formula, please refer to the above technical specifications.

[0097] The UE may then also determine the random access channel used to transmit the preamble sequence / PRACH, and the transmitted preamble sequence.

[0098] Next, the UE instructs the physical layer to transmit the Random Access Preamble and the corresponding target received power of the preamble. The UE then determines whether the current random access procedure is a random access procedure for an LTM candidate cell triggered by a PDCCH order:

[0099] If yes, then the random access process is considered complete and the value of TEMP-POWER CONTER can be set equal to PREAMBLE_POWER_RAMPING_COUNTER;

[0100] If not, the aforementioned setting process for TEMP-POWER CONTER is not performed.

[0101] Example 2

[0102] Based on Example 1, if the UE receives a PDCCH order, triggering a random access procedure for an LTM candidate cell, the UE may set the TEMP-POWER CONTER value to 1 in one or more of the following situations.

[0103] - The candidate cell indicated in the PDCCH order is different from the one indicated in the PDCCH previously received by the UE that triggered the random access procedure for the LTM candidate cell. This can be determined by the difference in the received candidate cell identifiers. That is, the candidate cell identifier indicated in the PDCCH order is different from the candidate cell identifier indicated in the PDCCH previously received by the UE that triggered the random access procedure for the LTM candidate cell.

[0104] - The SS / PBCH index indicated in this PDCCH order is different from the one indicated in the PDCCH previously received by the UE that triggered the random access procedure for the LTM candidate cell

[0105] -The PDCCH order indicates the initial transmission of the information indication preamble sequence.

[0106] Preferably, the comparison is made here with the latest received PDCCH order that triggers the random access process for the LTM candidate cell.

[0107] Example 3

[0108] Based on Example 2, upon receiving the PDCCH order, the UE may start a PDCCH order validity timer, V-order, to determine the validity duration of the currently received PDCCH order. When the V-order timer expires, the random access procedure is considered complete, and the UE may also set the TEMP-POWER CONTER value to 1.

[0109] Example 4

[0110] The method performed by the user equipment UE involved in embodiment 4 may include the following steps:

[0111] The UE initiates a random access procedure;

[0112] During the random access initialization process, the UE sets variables related to the preamble power.

[0113] As an example, the variable related to the preamble power may be, for example, the variable PREAMBLE_POWER_RAMPING_COUNTER-LTM.

[0114] For example, you can set the above variables as follows:

[0115] In one case, the random access procedure currently initiated by the UE is a random access procedure for an LTM candidate cell triggered by a PDCCH order, and the UE sets the value of the variable PREAMBLE_POWER_RAMPING_COUNTER-LTM to be equal to 1.

[0116] In one case, the random access procedure currently initiated by the UE is not a random access procedure for an LTM candidate cell triggered by a PDCCH order, but may be a random access procedure triggered by a scheduling request, or triggered or initiated by beam failure recovery. In this case, the UE sets the value of the variable PREAMBLE_POWER_RAMPING_COUNTER to 1.

[0117] The UE then performs the following operations before transmitting the preamble sequence:

[0118] In one case, the random access procedure currently being initiated by the UE is a random access procedure for an LTM candidate cell triggered by a PDCCH order, then the UE increases the value of PREAMBLE_POWER_RAMPING_COUNTER-LTM by 1 (increment PREAMBLE_POWER_RAMPING_COUNTER-LTM by 1), that is, PREAMBLE_POWER_RAMPING_COUNTER-LTM=PREAMBLE_POWER_RAMPING_COUNTER-LTM+1

[0119] -Calculate the target received power of the preamble sequence, using the above variable PREAMBLE_POWER_RAMPING_COUNTER-LTM in the calculation.

[0120] The specific formula used to calculate the transmission power based on the variable PREAMBLE_POWER_RAMPING_COUNTER-LTM can refer to the formula for calculating the target received power PREAMBLE_RECEIVED_TARGET_POWER of the preamble sequence in Section 1, Section 3 of Chapter 5 of the existing 3rd Generation Partnership Project (3GPP) Technical Specification (TS) 38.321 version v17.2.0, which is excerpted as follows:

[0121] PREAMBLE_RECEIVED_TARGET_POWER= preambleReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_POWER_RAMPING_COUNTER-1)×PREAMBLE_POWER_RAMPING_STEP+POWER_OFFSET_2STEP_RA

[0122] For the meaning of the letters in the above formula, please refer to the above technical specifications. PREAMBLE_POWER_RAMPING_COUNTER is replaced by PREAMBLE_POWER_RAMPING_COUNTER-LTM.

[0123] Preferably, the POWER_OFFSET_2STEP_RA in the above formula always takes the value of 0, or the simplified formula is as follows: PREAMBLE_RECEIVED_TARGET_POWER=preambleReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_POWER_RAMPING_COUNTER-LTM-1)×PREAMBLE_POWER_RAMPING_STEP.

[0124] In one case, the random access procedure currently initiated by the UE is not a random access procedure for the LTM candidate cell triggered by the PDCCH order, for example, it may be a random access procedure triggered by a scheduling request, or triggered or started by beam failure recovery, then the UE

[0125] - Increase the value of PREAMBLE_POWER_RAMPING_COUNTER by 1 (increment PREAMBLE_POWER_RAMPING_COUNTER by 1), that is, PREAMBLE_POWER_RAMPING_COUNTSR=PREAMBLE_POWER_RAMPING_COUNTER+1

[0126] - Calculate the target received power of the preamble sequence, using the variable PREAMBLE_POWER_RAMPING_COUNTER instead of the variable PREAMBLE_POWER_RAMPING_COUNTER-LTM. That is, depending on the triggering reason or the starting reason of the random access procedure currently started, the UE uses different variables to calculate the target received power

[0127] The specific formula used to calculate the transmission power based on the variable PREAMBLE_POWER_RAMPING_COUNTER can refer to the formula for calculating the target received power PREAMBLE_RECEIVED_TARGET_POWER of the preamble sequence in Section 1, Section 3 of Chapter 5 of the existing 3rd Generation Partnership Project (3GPP) Technical Specification (TS) 38.321 version v17.2.0, which is excerpted as follows:

[0128] PREAMBLE_RECEIVEDTARGET_POWER=preambleReceivedTargetPower+DELTA_PREAMBLE+ (PREAMBLE_POWER_RAMPING_COUNTER-1)×PREAMBLE_POWER_RAMPING_STEP+POWER_OFFSET_2STEP_RA

[0129] For the meaning of each letter in the above formula, please refer to the above technical specifications.

[0130] Next, the UE instructs the physical layer to transmit the Random Access Preamble and the corresponding target received power of the preamble.

[0131] Example 5

[0132] Based on Example 4, if the UE receives a PDCCH order, triggering a random access procedure for an LTM candidate cell, the UE may set the value of PREAMBLE_POWER_RAMPING_COUNTER-LTM to 1 in one or more of the following situations.

[0133] - The candidate cell indicated in the PDCCH order is different from the one indicated in the PDCCH previously received by the UE that triggered the random access procedure for the LTM candidate cell. This can be determined by the difference in the received candidate cell identifiers. That is, the candidate cell identifier indicated in the PDCCH order is different from the candidate cell identifier indicated in the PDCCH previously received by the UE that triggered the random access procedure for the LTM candidate cell.

[0134] - The SS / PBCH index indicated in the PDCCH order is different from the one indicated in the PDCCH previously received by the UE that triggered the random access procedure for the LTM candidate cell;

[0135] -Indicates that the information is used for the initial transmission of the preamble sequence.

[0136] Preferably, the comparison is made here with the latest received PDCCH order that triggers the random access process for the LTM candidate cell.

[0137] Example 6

[0138] Based on Example 5, upon receiving the PDCCH order, the UE starts a PDCCH order validity timer, V-order, to determine the validity duration of the currently received PDCCH order. When the V-order timer expires, the random access procedure is considered complete, and the UE may also set the PREAMBLE_POWER_RAMPING_COUNTER-LTM value to 1.

[0139] Example 7

[0140] In the aforementioned embodiment, when a random access procedure is triggered or started, if the "timer V-order" is running, the timer is stopped.

[0141] Example 8

[0142] In the aforementioned embodiment, when the “timer V-order” times out, the UE may determine whether a random access procedure is in progress. If no random access procedure is in progress, the UE may set the value of TEMP-POWER CONTER to 1, or set the value of PREAMBLE_POWER_RAMPING_COUNTER to 1. Conversely, if a random access procedure is in progress, the UE does not perform the above-mentioned operation of setting TEMP-POWER CONTER or PREAMBLE_POWER_RAMPING_COUNTER.

[0143] FIG2 is a block diagram showing a simplified structure of a user device 20 according to the present disclosure. As shown in FIG2 , the user device 20 includes a processor 201 and a memory 202. The processor 201 may include, for example, a microprocessor, a microcontroller, an embedded processor, etc. The memory 202 may include, for example, 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. The memory 202 stores program instructions. When executed by the processor 201, the instructions may execute the above-described method performed by the user device as described in detail in the present disclosure (such as the method shown in FIG1 ).

[0144] The program running on the device according to the present disclosure may be a program that controls a central processing unit (CPU) to enable a computer to implement the functions of the embodiments of the present disclosure. The program or the information processed by the program may 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.

[0145] The program for realizing each embodiment function of the present disclosure can be recorded on a computer-readable recording medium. The corresponding function can be realized by making a computer system read the program recorded on the recording medium and executing these 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). "Computer-readable recording medium" can be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a short-term dynamic storage program recording medium or any other recording medium that is computer-readable.

[0146] The various features or functional modules of the devices used in the above embodiments can be implemented or executed by circuits (e.g., single-chip or multi-chip integrated circuits). The circuits designed to perform the functions described in this specification may 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 gate or transistor logic, discrete hardware components, or any combination of the above devices. The general-purpose processor may be a microprocessor, or any existing processor, controller, microcontroller, or state machine. The above circuits may be digital circuits or analog circuits. In the case where new integrated circuit technologies have emerged to replace existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present disclosure may also be implemented using these new integrated circuit technologies.

[0147] Furthermore, the present disclosure is not limited to the above-described embodiments. Although various examples of the embodiments have been described, the present disclosure is not limited thereto. Fixed or non-mobile electronic devices installed indoors or outdoors can be used as UE devices or communication devices, such as AV equipment, kitchen equipment, cleaning equipment, air conditioners, office equipment, vending machines, and other household appliances.

[0148] As described above, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. However, the specific structure is not limited to the above-mentioned embodiments, and the present disclosure also includes any design changes that do not deviate from the main purpose of the present disclosure. In addition, various modifications can be made to the present disclosure within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present disclosure. In addition, components with the same effect described in the above-mentioned embodiments can be replaced with each other.

Claims

1. A method performed by a user equipment UE, comprising: The UE starts a random access process; When the UE determines that the initiated random access procedure is a random access procedure for an LTM candidate cell triggered by a first physical downlink control channel command PDCCH order, and the first PDCCH order indicates the first transmission of a preamble sequence, setting the value of the first variable equal to 1; When the UE determines that the initiated random access procedure is a random access procedure for an LTM candidate cell triggered by a second PDCCH order, and the second PDCCH order indicates retransmission of a preamble sequence, and when the candidate cell indicated in the second PDCCH order is different from the candidate cell indicated in the first PDCCH order, setting the value of the first variable equal to 1; The UE calculates the second variable based on the value of the first variable, The UE instructs the physical layer to use the second variable to send a random access preamble sequence, and When the UE determines that the initiated random access procedure is a random access procedure triggered by a PDCCH order and directed to an LTM candidate cell, it is considered that the random access procedure is completed.

2. A user equipment, comprising: processor; as well as A memory storing instructions; Wherein, when the instructions are executed by the processor, the user equipment is caused to perform the method according to claim 1.

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