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CN-122003939-A - Terminal, wireless communication method and base station

CN122003939ACN 122003939 ACN122003939 ACN 122003939ACN-122003939-A

Abstract

The terminal according to one aspect of the present disclosure includes a receiving unit that receives a downlink control channel command including information on a candidate cell or an additional cell, and a control unit that controls physical random access channel transmission (PDCCH command RACH) triggered by the downlink control channel command based on the information, and the control unit determines a cell for L1/L2 inter-cell mobility (LTM) or a cell for 2TA using two timing advances based on the information.

Inventors

  • OKUMURA MAMORU
  • MATSUMURA YUSUKE
  • HARADA HIROYASU
  • WANG JING

Assignees

  • 株式会社NTT都科摩

Dates

Publication Date
20260508
Application Date
20241001
Priority Date
20231010

Claims (6)

  1. 1. A terminal, comprising: a receiving unit for receiving a downlink control channel command including information related to a candidate cell or an additional cell, and A control unit controlling a physical random access channel transmission, namely, a PDCCH command RACH, triggered by a downlink control channel command based on the information, The control unit determines, based on the information, an L1/L2 inter-cell mobility-oriented, i.e. LTM-oriented, cell or a2 TA-oriented cell using two timing advances.
  2. 2. The terminal of claim 1, wherein, The information has separate fields for the LTM and the 2TA oriented or a combined field for the LTM and the 2TA oriented.
  3. 3. The terminal of claim 1, wherein, The information has a common field for the LTM and the 2TA oriented and an additional field for interpretation of the common field, The control unit determines the LTM-oriented or the 2 TA-oriented cell based on the common field and the additional field.
  4. 4. The terminal of claim 1, wherein, The control unit determines a specific bit field size included in the information based on the number of candidate cells set in RACH settings, which are random access channel settings provided for early TA acquisition, or the number of PCIs, which are physical cell IDs of additional active non-serving cells corresponding to the 2 TA.
  5. 5. A wireless communication method for a terminal includes: A step of receiving a downlink control channel command including information related to the candidate cell or the additional cell, and Based on the information, controlling a physical random access channel transmission triggered by a downlink control channel command, i.e., a PDCCH commanding RACH, Based on the information, the terminal judges a cell facing the L1/L2 inter-cell mobility, namely, a cell facing the LTM or a cell facing the 2TA by utilizing two timing advances.
  6. 6. A base station, comprising: A transmitting unit for transmitting a downlink control channel command including information related to the candidate cell or the additional cell, The base station controls the generation of the information, which is used for the terminal to control the physical random access channel transmission triggered by the downlink control channel command, namely, the PDCCH command RACH, and is used for the terminal to judge the cell facing the L1/L2 inter-cell mobility, namely, the LTM, or the cell facing the 2TA by utilizing two timing advance.

Description

Terminal, wireless communication method and base station Technical Field The present disclosure relates to a terminal, a wireless communication method, and a base station in a next generation mobile communication system. Background In a universal mobile telecommunications system (Universal Mobile Telecommunications System (UMTS)) network, long term evolution (Long Term Evolution (LTE)) has been standardized for the purpose of further high-speed data rates, low latency, and the like (non-patent document 1). Further, LTE-Advanced (3 GPP rel.10-14) has been standardized for the purpose of further large capacity, advanced evolution, and the like of LTE (Third Generation Partnership Project (3 GPP (registered trademark)) Release (Release) 8, 9). Subsequent systems of LTE (e.g., also referred to as fifth generation mobile communication system (5 th generation mobile communication system (5G)), 5g+ (plus), sixth generation mobile communication system (6 th generation mobile communication system (6G)), new Radio (NR)), 3gpp rel.15 later, and the like are also being studied. Prior art literature Non-patent literature Non-patent document 1：3GPP TS 36.300 V8.12.0 "Evolved Universal Terrestrial Radio Access （E-UTRA） and Evolved Universal Terrestrial Radio Access Network （E-UTRAN）; Overall description; Stage 2 （Release 8）",2010, month 4 Disclosure of Invention Problems to be solved by the invention In future wireless communication systems (e.g., rel.17/5G-after wireless communication systems), it is assumed that communication is controlled based on inter-cell mobility (inter-cell mobility) including non-serving cells (non-SERVING CELL) or inter-cell mobility using a plurality of transmission/reception points (e.g., multi-TRP (MTRP)), in inter-cell mobility, it is also assumed that candidate cells are set and handover/handover (handover) between serving cells and candidate cells is performed using L1/L2 signaling. For example, in the LTM of rel.18, a RACH (PDCCH order RACH) based on PDCCH order (order) without RAR is supported for a candidate cell. On the other hand, as a candidate cell, a serving cell can also be set. In this case, there may be a case where the UE does not know whether a serving cell (e.g., SCell) set as a candidate cell performs an existing PDCCH order RACH or performs a PDCCH order RACH without RAR. If the RACH procedure to be applied cannot be properly selected according to the set candidate cell in this way, cell handover may not be properly performed, and there is a concern that degradation of throughput and degradation of communication quality may occur. The present disclosure has been made in view of such a point, and an object thereof is to provide a terminal, a radio communication method, and a base station that can clearly distinguish RACH procedures corresponding to a set candidate cell and can appropriately control communication. Means for solving the problems The terminal according to one aspect of the present disclosure includes a receiving unit that receives a downlink control channel command including information on a candidate cell or an additional cell, and a control unit that controls physical random access channel transmission (PDCCH command RACH) triggered by the downlink control channel command based on the information, and the control unit determines a cell for L1/L2 inter-cell mobility (LTM) or a cell for 2TA using two timing advances based on the information. Effects of the invention According to one aspect of the present disclosure, it is possible to clarify the distinction of RACH procedures corresponding to a set candidate cell and to appropriately control communication. Drawings Fig. 1A is a diagram showing an example of movement of a UE in rel.17. Fig. 1B is a diagram showing an example of movement of the UE in rel.18. Fig. 2 is a diagram showing an example of the LTM process. Fig. 3 is a diagram showing an example of comparison of the L3 handover with the LTM of rel.18. Fig. 4 is a diagram showing an example of association of a serving cell with a candidate cell. Fig. 5A is a diagram showing a first example of option 2 for candidate cell setting. Fig. 5B is a diagram showing a second example of option 2 of candidate cell setting. Fig. 6 is a diagram showing a serving cell switch (switch) example 1. Fig. 7 is a diagram showing a serving cell transition example 2. Fig. 8 is a diagram showing a serving cell transition example 3. Fig. 9 is a diagram showing an outline of L1L2-triggered mobility (L1L 2-TRIGGERED MOBILITY (LTM)). Fig. 10 is a diagram showing RACH (PDCCH ordered RACH (PDCCH order RACH)) with a PDCCH-based indication for a serving cell with Random Access Response (RAR) monitoring. Fig. 11 is a diagram showing RACH (PDCCH ordered RACH (PDCCH order RACH)) for a candidate cell without Random Access Response (RAR) monitoring based on an indication of PDCCH. Fig. 12 is a diagram showing DCI format 1_0 CRC-scrambled through a C-RNTI. Fig. 13 is a diagram showing an exam