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EP-4742780-A1 - TERMINAL, WIRELESS COMMUNICATION METHOD, AND BASE STATION

EP4742780A1EP 4742780 A1EP4742780 A1EP 4742780A1EP-4742780-A1

Abstract

A terminal according to an aspect of the present disclosure includes: a receiving section that receives information related to an additional cell corresponding to a serving cell; and a control section that controls, in a case where total transmit power exceeds a certain value when a plurality of UL transmissions are performed including a random access channel for the additional cell and another UL transmission, power allocation for a UL transmission on the basis of a priority order corresponding to a random access channel transmission for the additional cell and a priority order corresponding to another UL transmission.

Inventors

  • MATSUMURA, YUKI
  • NAGATA, SATOSHI
  • SUN, Weiqi
  • WANG, JING
  • CHEN, LAN

Assignees

  • NTT DOCOMO, INC.

Dates

Publication Date
20260513
Application Date
20230705

Claims (6)

  1. A terminal comprising: a receiving section that receives information related to an additional cell corresponding to a serving cell; and a control section that controls, in a case where total transmit power exceeds a certain value when a plurality of UL transmissions are performed including a random access channel for the additional cell and another UL transmission, power allocation for a UL transmission on a basis of a priority order corresponding to a random access channel transmission for the additional cell and a priority order corresponding to another UL transmission.
  2. The terminal according to claim 1, wherein a different priority order is configured per type of the serving cell corresponding to the additional cell, as the priority order corresponding to the random access channel transmission for the additional cell.
  3. The terminal according to claim 1, wherein a same priority order is configured irrespective of types of the serving cell corresponding to the additional cell, as the priority order corresponding to the random access channel transmission for the additional cell.
  4. The terminal according to claim 1, wherein the priority order corresponding to the random access channel transmission for the additional cell is configured to be lower than a priority order corresponding to a random access channel transmission for a serving cell.
  5. A radio communication method for a terminal, the radio communication method comprising: receiving information related to an additional cell corresponding to a serving cell; and controlling, in a case where total transmit power exceeds a certain value when a plurality of UL transmissions are performed including a random access channel for the additional cell and another UL transmission, power allocation for a UL transmission on a basis of a priority order corresponding to a random access channel transmission for the additional cell and a priority order corresponding to another UL transmission.
  6. A base station comprising: a transmitting section that transmits, to a terminal, information related to an additional cell corresponding to a serving cell; and a control section that judges, in a case where total transmit power exceeds a certain value when the terminal performs a plurality of UL transmissions including a random access channel for the additional cell and another UL transmission, power allocation for a UL transmission is employed based on a priority order corresponding to a random access channel transmission for the additional cell and a priority order corresponding to another UL transmission.

Description

Technical Field The present disclosure relates to a terminal, a radio communication method, and a base station in next-generation mobile communication systems. Background Art In a Universal Mobile Telecommunications System (UMTS) network, the specifications of Long-Term Evolution (LTE) have been drafted for the purpose of further increasing high speed data rates, providing lower latency and so on (see Non-Patent Literature 1). In addition, for the purpose of further high capacity, advancement and the like of the LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8 and Rel. 9), the specifications of LTE-Advanced (3GPP Rel. 10 to Rel. 14) have been drafted. Successor systems of LTE (for example, also referred to as "5th generation mobile communication system (5G)," "5G+ (plus)," "6th generation mobile communication system (6G)," "New Radio (NR)," "3GPP Rel. 15 (or later versions)," and so on) are also under study. Citation List Non-Patent Literature Non-Patent Literature 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)," April, 2010 Summary of Invention Technical Problem For future radio communication systems (for example, radio communication systems later than Rel. 17/5G), it is assumed that communication using multi-TRP between a plurality of cells including a non-serving cell (for example, additional cell) or communication using mobility between a plurality of cells (inter-cell mobility) including a non-serving cell (for example, candidate cell) is supported. Meanwhile, in a case where a UL transmission is possible for one or a plurality of additional cells/candidate cells, how the UL transmission is controlled is an issue. Unless such UL transmission for one or a plurality of additional cells/candidate cells is appropriately controlled, quality of communication using a plurality of transmission/reception points may be degraded. In view of this, an object of the present disclosure is to provide a terminal, a radio communication method, and a base station that enable a UL transmission to be appropriately controlled even in a case where the UL transmission is possible for one or a plurality of additional cells/candidate cells. Solution to Problem A terminal according to an aspect of the present disclosure includes: a receiving section that receives information related to an additional cell corresponding to a serving cell; and a control section that controls, in a case where total transmit power exceeds a certain value when a plurality of UL transmissions are performed including a random access channel for the additional cell and another UL transmission, power allocation for a UL transmission on the basis of a priority order corresponding to a random access channel transmission for the additional cell and a priority order corresponding to another UL transmission. Advantageous Effects of Invention An aspect of the present disclosure enables a UL transmission to be appropriately controlled even in a case where the UL transmission is possible for one or a plurality of additional cells/candidate cells. Brief Description of Drawings [FIG. 1] FIG. 1 is a diagram to show an example of timing advance groups (TAGs) that cells included in a cell group belong to.[FIG. 2] FIG. 2A is a diagram to show an example of intra-cell multi-TRP. FIG. 2B is a diagram to show an example of inter-cell multi-TRP.[FIG. 3] FIG. 3A is a diagram to show an example of mobility of a UE in Rel. 17. FIG. 3B is a diagram to show an example of mobility of a UE in Rel. 18 or later versions.[FIG. 4] FIG. 4 is a diagram to show an example of association between serving cells and candidate cells.[FIG. 5] FIG. 5A is a diagram to show a first example of Option 2 for a candidate cell configuration. FIG. 5B is a diagram to show a second example of Option 2 for the candidate cell configuration.[FIG. 6] FIG. 6 is a diagram to show a PDCCH-indicated RACH (PDCCH ordered RACH), with random access response (RAR) monitoring, for a serving cell.[FIG. 7] FIG. 7 is a diagram to show a PDCCH-indicated RACH (PDCCH ordered RACH), without random access response (RAR) monitoring, for a candidate cell.[FIG. 8] FIG. 8 is a diagram to show an example of inter-cell multi-TRP.[FIG. 9] FIG. 9 is a diagram to show an example of UL transmission power control according to the present embodiment.[FIG. 10] FIG. 10 is a diagram to show an example of a schematic structure of a radio communication system according to one embodiment.[FIG. 11] FIG. 11 is a diagram to show an example of a structure of a base station according to one embodiment.[FIG. 12] FIG. 12 is a diagram to show an example of a structure of a user terminal according to one embodiment.[FIG. 13] FIG. 13 is a diagram to show an example of a hardware structure of the base station and the user terminal according to one embodiment.[FIG. 14] FIG. 14 i