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US-20260128847-A1 - METHOD AND APPARATUS FOR SUBBAND FULL DUPLEXING IN MOBILE WIRELESS COMMUNICATION SYSTEM

US20260128847A1US 20260128847 A1US20260128847 A1US 20260128847A1US-20260128847-A1

Abstract

A method and apparatus to support sub-band full duplex is provided. The method comprises receiving a RRC message that includes various parameters for SBFD; triggering a PHR; determining a format of the PHR; determining the PH and PCMAX for non-SBFD uplink transmission and PH and PCMAX for SBFD uplink transmission; including in the PHR MAC CE determined PHs and PCMAXs; and transmitting the PHR MAC CE.

Inventors

  • Soenghun KIM

Assignees

  • SETLAB Co., LTD.

Dates

Publication Date
20260507
Application Date
20250916
Priority Date
20241105

Claims (9)

  1. 1 . A method performed by a terminal, the method comprising: receiving, by the terminal from a base station, system information, wherein the system information comprises: a parameter for a frequency-domain portion of uplink bandwidth for Sub-band Full Duplex (SBFD); a set of parameters for a time-domain portion for SBFD; and a set of parameters for cell-specific time division duplex (TDD) configuration; receiving, by the terminal from the base station, a radio resource control (RRC) message, wherein the RRC message comprises: a parameter for a location of a slot format indicator (SFI) index field in a specific downlink control information (DCI); and a parameter for a monitoring periodicity for the specific DCI; receiving, by the terminal from the base station, the specific downlink control information (DCI); performing, by the terminal, downlink reception in a first symbol, based on that the first symbol is: determined as a flexible symbol by the set of parameters for cell-specific TDD configuration; not located in the time-domain portion for SBFD; and determined as a downlink symbol by the SFI index field; performing, by the terminal, uplink transmission in a second symbol, based on that the second symbol is: determined as a flexible symbol by the set of parameters for cell-specific TDD configuration; located in the time-domain portion for SBFD; and determined as a downlink symbol by the SFI index field; wherein the uplink transmission in the second symbol is performed within the frequency-domain portion of uplink bandwidth for SBFD.
  2. 2 . The method of claim 1 , wherein the time-domain portion for SBFD: starts at a first slot indicated by a starting slot index for SBFD and at a first symbol within the first slot indicated by a starting symbol index for SBFD; and ends at a second slot indicated by an ending slot index for SBFD and at a second symbol within the second slot indicated by an ending symbol index for SBFD.
  3. 3 . The method of claim 1 , wherein the first symbol is determined to be a flexible symbol by the set of parameters for cell-specific TDD configuration in case that the first symbol is neither a downlink symbol nor an uplink symbol according to the set of parameters for cell-specific TDD configuration.
  4. 4 . The method of claim 2 , wherein: the first symbol is not within the time-domain portion for SBFD in case that the first symbol is not one of the consecutive symbols; and the second symbol is within the time-domain portion for SBFD in case that the second symbol is one of the consecutive symbols.
  5. 5 . The method of claim 1 , wherein: the SFI index collectively indicates a plurality of slot formats for a plurality of slots; each of the plurality of slot formats indicates types of symbols of a corresponding slot; and the type of symbol is one of a downlink symbol, a flexible symbol or an uplink symbol.
  6. 6 . The method of claim 1 , further comprising: performing uplink transmission of a first sounding reference signal (SRS) in a third symbol, wherein: the third symbol is indicated as a downlink symbol by the set of parameters for the cell-specific TDD configuration; and a configuration parameter for the first SRS comprises a specific indication related to SBFD; and performing uplink transmission of a second SRS in a fourth symbol, wherein: the fourth symbol is indicated as an uplink symbol by the set of parameters for the cell-specific TDD configuration; and a configuration parameter for the second SRS does not comprise the specific indication related to SBFD.
  7. 7 . A terminal in a wireless communication system, the terminal comprising: a transceiver configured to transmit and receive a signal; and a controller configured to control the transceiver to: receive, from a base station, system information, wherein the system information comprises: a parameter for a frequency-domain portion of uplink bandwidth for Sub-band Full Duplex (SBFD); a set of parameters for a time-domain portion for SBFD; and a set of parameters for cell-specific time division duplex (TDD) configuration; receive, from the base station, a radio resource control (RRC) message, wherein the RRC message comprises: a parameter for a location of a slot format indicator (SFI) index field in a specific downlink control information (DCI); and a parameter for a monitoring periodicity for the specific DCI; receive, from the base station, the specific downlink control information (DCI); perform downlink reception in a first symbol based on that the first symbol is: determined as a flexible symbol by the set of parameters for cell-specific TDD configuration; not located in the time-domain portion for SBFD; and determined as a downlink symbol by the SFI index field; perform uplink transmission in a second symbol based on that the second symbol is: determined as a flexible symbol by the set of parameters for cell-specific TDD configuration; located in the time-domain portion for SBFD; and determined as a downlink symbol by the SFI index field; wherein the uplink transmission in the second symbol is performed within the frequency-domain portion of uplink bandwidth for SBFD.
  8. 8 . A method performed by a base station, the method comprising: transmitting, by the base station to a terminal, system information, wherein the system information comprises: a parameter for a frequency-domain portion of uplink bandwidth for Sub-band Full Duplex (SBFD); a set of parameters for a time-domain portion for SBFD; and a set of parameters for cell-specific time division duplex (TDD) configuration; transmitting, by the base station to the terminal, a radio resource control (RRC) message, wherein the RRC message comprises: a parameter for a location of a slot format indicator (SFI) index field in a specific downlink control information (DCI); and a parameter for a monitoring periodicity for the specific DCI; transmitting, by the base station to the terminal, the specific downlink control information (DCI); performing, by the base station, downlink transmission in a first symbol, based on that the first symbol is: determined as a flexible symbol by the set of parameters for cell-specific TDD configuration; not located in the time-domain portion for SBFD; and determined as a downlink symbol by the SFI index field; performing, by the base station, uplink reception in a second symbol, based on that the second symbol is: determined as a flexible symbol by the set of parameters for cell-specific TDD configuration; located in the time-domain portion for SBFD; and determined as a downlink symbol by the SFI index field; wherein the uplink reception in the second symbol is performed within the frequency-domain portion of uplink bandwidth for SBFD.
  9. 9 . The method of claim 2 , wherein a configuration period for the time-domain portion for SBFD is a sum of a first periodicity and a second periodicity, and wherein the first periodicity and the second periodicity are provided by the system information.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to and the benefit of Korean Patent Application Nos. 10-2024-0155564, filed on Nov. 5, 2024, and 10-2025-0129933, filed on Sep. 11, 2025. Each of the above documents is hereby incorporated herein by reference in its entirety. BACKGROUND Technical Field The present disclosure relates to sub-band full duplexing in wireless mobile communication system. Related Art TDD is widely used in commercial NR deployments. In TDD, the time domain resource is split between downlink and uplink. Allocation of a limited time duration for the uplink in TDD would result in reduced coverage, increased latency and reduced capacity. As a possible enhancement, simultaneous existence of downlink and uplink, a.k.a. full duplex, or more specifically, subband non-overlapping full duplex (SBFD) at the gNB side within a conventional TDD band can be considered. SUMMARY A method and apparatus to support sub-band full duplex is provided. The method comprises receiving a RRC message that includes various parameters for SBFD; triggering a PHR; determining a format of the PHR; determining the PH and PCMAX for non-SBFD uplink transmission and PH and PCMAX for SBFD uplink transmission; including in the PHR MAC CE determined PHs and PCMAXs; and transmitting the PHR MAC CE. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating the architecture of 5G system and NG-RAN. FIG. 2 is a diagram illustrating wireless protocol architecture in 5G system. FIG. 3 illustrates random access procedure. FIG. 4 is a diagram illustrating ASN.1 structure of SIB1 with regards to frequency domain resource. FIG. 5 illustrates an example of frequency domain resource structure. FIG. 6 is a diagram illustrating ASN.1 structure of SIB1 with regards to time domain resource. FIG. 7 illustrates an example of time domain structure. FIG. 8 illustrates another example of frequency domain structure. FIG. 9 illustrates another example of time domain structure. FIG. 10 illustrates an example of resource pools. FIG. 11 is a diagram illustrating ASN.1 structure of SIB1 with regards to SBFD configuration. FIG. 12 illustrates overall operation of the UE and GNB. FIG. 13 is a diagram illustrating ASN.1 structure of SIB1 with regards to RACH configuration. FIG. 14 illustrates an example of RACH occasions. FIG. 15 illustrates RACH operation based on SBFD. FIG. 16 illustrates an example of RACH occasions and feature combinations. FIG. 17 illustrates another example of frequency domain structure. FIG. 18 illustrates MAC PDU format. FIG. 19 illustrates format of random access response. FIG. 20 illustrates an example of PUSCH resource selection. FIG. 21 illustrates an example of BWPs of a cell. FIG. 22 is a diagram illustrating ASN.1 structure of SIB1 and RRCReconfiguration. FIG. 23 is a diagram illustrating ASN.1 structure of BWP configuration information. FIG. 24 is a diagram illustrating ASN.1 structure of TDD uplink downlink configuration. FIG. 25 illustrates an example of S-BWP and L-BWP of a cell. FIG. 26 illustrates an example of virtual symbol and actual symbol. FIG. 27 illustrates operation of UE and GNB. FIG. 28 is a flow diagram illustrating operation of a terminal. FIG. 29 is a block diagram illustrating the internal structure of a UE to which the disclosure is applied. FIG. 30 is a block diagram illustrating the configuration of a base station according to the disclosure. FIG. 31 is a diagram illustrating SFI configuration. FIG. 32 is a diagram illustrating periodic uplink signal transmission and periodic downlink reception. FIG. 33 is a flow diagram illustrating operation of a terminal. FIG. 34 illustrates operations of UE and GNB for power headroom reporting. FIG. 35 illustrates various equations related to uplink transmission power. FIG. 36 illustrates various formats of PHR MAC CE. FIG. 37 illustrates various formats of PHR MAC CE. FIG. 38 illustrates various formats of PHR MAC CE. FIG. 39 illustrates mapping information for various fields in PHR MAC CE. FIG. 40 is a flow diagram illustrating operation of UE. DETAILED DESCRIPTION Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, in the description of the present disclosure, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present disclosure, the detailed description thereof will be omitted. In addition, the terms to be described later are terms defined in consideration of functions in the present disclosure, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification. The terms used, in the following description, for indicating access nodes, network entities, messages, interfaces between network entities, and diverse identity information is provided for convenience of