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CN-122029918-A - Method and apparatus for optimizing MT-SDT operation in mobile communication system

CN122029918ACN 122029918 ACN122029918 ACN 122029918ACN-122029918-A

Abstract

The present disclosure relates to 5G or 6G communication systems for supporting higher data transmission rates. A method performed by a User Equipment (UE) in a wireless communication system may include receiving a Radio Resource Control (RRC) release message from a base station, the RRC release message including configuration information regarding Small Data Transfer (SDT), performing an RRC recovery procedure for the SDT based on the configuration information when a paging message including an indication of the SDT is received from the base station, and transmitting information indicating a cause of the SDT failure to the base station when the SDT fails.

Inventors

  • JIN XIANGFAN

Assignees

  • 三星电子株式会社

Dates

Publication Date
20260512
Application Date
20240926
Priority Date
20230926

Claims (15)

  1. 1. A method performed by a user equipment, UE, in a wireless communication system, the method comprising: Receiving a radio resource control, RRC, release message from a base station, the RRC release message including configuration information regarding small data transmissions, SDTs; in case of receiving a paging message containing an SDT indication from the base station, performing an RRC recovery procedure for the SDT based on the configuration information, and In the case of the SDT failure, information indicating a cause of the SDT failure is transmitted to the base station.
  2. 2. The method of claim 1, wherein the cause of the SDT failure comprises expiration of a timer associated with the SDT failure.
  3. 3. The method of claim 1, further comprising: a system information block 1 SIB1 is received from the base station, Wherein the SIB1 comprises first information related to a threshold value for determining whether MT SDT of the mobile terminal can be initiated, and Wherein the configuration information includes second information related to a maximum duration until a next configuration grant CG SDT occasion.
  4. 4. A method according to claim 3, wherein the SDT is performed according to CG-SDT in case the reference signal received power RSRP of the downlink DL pathloss reference is higher than a value configured based on the first information and the duration between initiation of SDT and the next CG-SDT occasion is shorter than the maximum duration configured based on the second information.
  5. 5. A method performed by a base station in a wireless communication system, the method comprising: Transmitting a radio resource control, RRC, release message to a user equipment, UE, the RRC release message comprising configuration information regarding small data transfer, SDT; Transmitting a paging message including an SDT indication to the UE, and In case of SDT failure based on the configuration information, information indicating a cause of the SDT failure is received from the UE.
  6. 6. The method of claim 5, wherein the cause of the SDT failure comprises expiration of a timer associated with the SDT failure.
  7. 7. The method of claim 5, further comprising: a system information block 1 SIB1 is sent to the UE, Wherein the SIB1 comprises first information related to a threshold value for determining whether MT SDT of the mobile terminal can be initiated, and Wherein the configuration information includes second information related to a maximum duration until a next configuration grant CG SDT occasion.
  8. 8. The method of claim 7, wherein the SDT is performed according to CG-SDT if a reference signal received power RSRP of a downlink DL pathloss reference is higher than a value configured based on the first information and a duration between initiation of SDT and a next CG-SDT occasion is shorter than the maximum duration configured based on the second information.
  9. 9. A user equipment, UE, in a wireless communication system, the UE comprising: transceiver, and A controller coupled to the transceiver, Wherein the controller is configured to: Receiving a radio resource control, RRC, release message from a base station, the RRC release message including configuration information regarding small data transmissions, SDTs; in case of receiving a paging message containing an SDT indication from the base station, performing an RRC recovery procedure for the SDT based on the configuration information, and In the case of the SDT failure, information indicating a cause of the SDT failure is transmitted to the base station.
  10. 10. The UE of claim 9, wherein the cause of the SDT failure comprises expiration of a timer associated with the SDT failure.
  11. 11. The UE of claim 9, wherein the controller is further configured to receive a system information block 1 SIB1 from the base station, Wherein the SIB1 comprises first information related to a threshold value for determining whether MT SDT of the mobile terminal can be initiated, and Wherein the configuration information includes second information related to a maximum duration until a next configuration grant CG SDT occasion.
  12. 12. The UE of claim 11, wherein the SDT is performed according to CG-SDT if a reference signal received power, RSRP, of a downlink DL pathloss reference is higher than a value configured based on the first information and a duration between initiation of SDT and a next CG-SDT occasion is shorter than the maximum duration configured based on the second information.
  13. 13. A base station in a wireless communication system, the base station comprising: transceiver, and A controller coupled to the transceiver, Wherein the controller is configured to: Transmitting a radio resource control, RRC, release message to a user equipment, UE, the RRC release message comprising configuration information regarding small data transfer, SDT; Transmitting a paging message including an SDT indication to the UE, and In case of SDT failure based on the configuration information, information indicating a cause of the SDT failure is received from the UE.
  14. 14. The base station of claim 13, wherein the cause of the SDT failure comprises expiration of a timer associated with the SDT failure.
  15. 15. The base station of claim 13, wherein the controller is further configured to: a system information block 1 SIB1 is sent to the UE, Wherein the SIB1 comprises first information related to a threshold value for determining whether MT SDT of the mobile terminal can be initiated, Wherein the configuration information includes second information related to a maximum duration until a next configuration grant CG SDT opportunity, and Wherein the SDT is executed according to CG-SDT in case that a reference signal received power RSRP of a downlink DL path loss reference is higher than a value configured based on the first information and a duration between initiation of the SDT and a next CG-SDT occasion is shorter than the maximum duration configured based on the second information.

Description

Method and apparatus for optimizing MT-SDT operation in mobile communication system Technical Field The present disclosure relates to wireless communication systems, and more particularly, to a method and apparatus for optimizing small data transfer (MT-SDT) operation of a mobile terminal in a mobile communication system. Background The 5G mobile communication technology defines a wide frequency band, realizes high transmission rate and novel services, and can be deployed not only in a frequency band of 'below 6 GHz' such as 3.5GHz, but also in a frequency band of 'above 6 GHz' including 28GHz and 39GHz, which are called millimeter waves. In addition, in order to achieve the goal of improving the transmission rate by 50 times and reducing the time delay to one tenth of that of the 5G mobile communication technology, the industry has considered to deploy the 6G mobile communication technology (also called super 5G system) in the terahertz (THz) frequency band (such as 95GHz to 3THz frequency band). In the early stage of development of 5G mobile communication technology, in order to support services related to enhanced mobile bandwidth (eMBB), ultra-reliable low-delay communication (URLLC) and mass machine type communication (mMTC) and meet performance requirements thereof, related standardization work has been advancing, and covered technologies include beamforming and massive MIMO technologies for alleviating path loss in millimeter waves and improving radio wave transmission distance, parameter set support (such as operating multiple subcarrier intervals) for efficiently utilizing millimeter wave resources and slot format dynamic operation, initial access technologies for supporting multi-beam transmission and broadband, definition and operation of BWP (bandwidth part), novel channel coding modes such as LDPC codes suitable for large data transmission and polarization codes suitable for high-reliability transmission of control information, L2 preprocessing technologies and network slicing technologies for providing special services with private networks. Currently, in combination with services to be supported by the 5G mobile communication technology, the industry is conducting research on improvement and performance enhancement of the primary 5G mobile communication technology, and standardization of a plurality of technologies is advanced in a physical layer, wherein the technology comprises a V2X (Internet of vehicles) technology for assisting an autonomous vehicle to make a driving decision and improving user convenience based on position and state information transmitted by the vehicle, an NR-U (new air interface unlicensed) technology for enabling a system to meet various regulation related requirements in an unlicensed frequency band, an NR UE energy-saving technology, an NTN (non-terrestrial network) technology for providing covered UE-satellite direct communication for an area where terrestrial network communication is unavailable, and a positioning technology. In addition, at the air interface architecture/protocol level, related standardization work is also continuously proceeding, and related technologies include IIoT (industrial internet of things) technology for supporting new services by interworking convergence with other industries, IAB (integrated access and backhaul) technology for providing nodes for expansion of network service areas by supporting wireless backhaul links and access links in an integrated manner, mobility enhancement technology including conditional handover and DAPS (dual active protocol stack) handover, and two-step random access (2-step RACH) technology for simplifying random access procedures. At the system architecture/traffic level, standardization work is advancing as well, involving 5G infrastructure (e.g., service-based architecture or service-based interface) for merging Network Function Virtualization (NFV) and Software Defined Network (SDN) technologies, and Mobile Edge Computing (MEC) technologies that receive services based on UE location. With the commercial use of the 5G mobile communication system, exponentially growing connection devices will be connected to the communication network, so there is a need to improve the functions and performances of the 5G mobile communication system and realize the integrated operation of the connection devices. For this reason, related new researches have been conducted, including XR (augmented reality) technology for efficiently supporting AR (augmented reality), VR (virtual reality), MR (mixed reality) and the like, technology for achieving 5G performance improvement and complexity reduction using Artificial Intelligence (AI) and Machine Learning (ML), AI service support technology, meta space service support technology, and unmanned aerial vehicle communication technology. In addition, such development of 5G mobile communication system will lay a foundation for not only new waveform technology for providing coverage