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US-12628239-B2 - Method and apparatus for data transfer and power headroom reporting in RRC_INACTIVE state in mobile wireless communication system

US12628239B2US 12628239 B2US12628239 B2US 12628239B2US-12628239-B2

Abstract

A method and apparatus for data transfer in RRC_INACTIVE state is provided. Method for data transfer in RRC_INACTIVE state includes transmitting a UECapabilityInformation, receiving a RRCRelease the RRC release message includes a first information for a second resume procedure, receiving a system information the system information includes a first threshold and a second threshold, initiating a second resume procedure and cancelling triggered PHR.

Inventors

  • Soenghun KIM

Assignees

  • BLACKPIN INC.
  • Soenghun KIM

Dates

Publication Date
20260512
Application Date
20230927
Priority Date
20210818

Claims (6)

  1. 1 . A method performed by a terminal, the method comprising: Receiving, by the terminal from a base station, a Radio Resource Control (RRC) message that instructs state transitioning to RRC inactive state; Performing, by the terminal, state transitioning to RRC inactive state; determining, by the terminal, to initiate a resume procedure for small data transmission; transmitting, by the terminal to the base station, a first Medium Access Control (MAC) Protocol Data Unit (PDU); and performing, by the terminal with the base station, the small data transmission, wherein a triggered Power Headroom Report (PHR) is cancelled by the terminal based on that: the resume procedure for the small data transmission being ongoing; and uplink grant being sufficient to accommodate all pending data available for transmission but not sufficient to accommodate all the pending data available and PHR Medium Access Control (MAC) Control Element (CE) and a subheader of the PHR MAC CE, wherein the first MAC PDU comprises: a first MAC Service Data Unit (SDU) that is generated based on a first base station security key; and a second MAC SDU that is generated based on a second base station security key.
  2. 2 . The method of claim 1 , wherein the first MAC PDU further comprises: a first MAC subheader for the first MAC SDU; and a second MAC subheader for the second MAC SDU.
  3. 3 . The method of claim 2 , wherein the first MAC subheader comprises a LCID field and does not comprise a L field, and wherein the second MAC subheader comprises the LCID field and the L field.
  4. 4 . The method of claim 2 , wherein the first MAC subheader and the first MAC SDU and the second MAC subheader and the second MAC SDU are located in the order in the first MAC PDU.
  5. 5 . The method of claim 1 , wherein the triggered PHR is included in the first MAC PDU based on that: the resume procedure for the small data transmission being ongoing; and uplink grant not being sufficient to accommodate all the pending data available.
  6. 6 . 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, a Radio Resource Control (RRC) message that instructs state transitioning to RRC inactive state; perform state transitioning to RRC inactive state; determine to initiate a resume procedure for small data transmission; transmit, to the base station, a first Medium Access Control (MAC) Protocol Data Unit (PDU); and perform with the base station the small data transmission, wherein triggered Power Headroom Report (PHR) is cancelled based on that: the resume procedure for the small data transmission being ongoing; and uplink grant being sufficient to accommodate all pending data available for transmission but not sufficient to accommodate all the pending data available and PHR Medium Access Control (MAC) Control Element (CE) and a subheader of the PHR MAC CE, wherein the first MAC PDU comprises: a first MAC Service Data Unit (SDU) that is generated based on a first base station security key; and a second MAC SDU that is generated based on a second base station security key.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a Continuation Application of U.S. patent application Ser. No. 18/122,139, Filed on Mar. 16, 2023, pending at the time of filing of the present Patent Application, which is a US Bypass Continuation Application of International Application No. PCT/KR2022/011401, filed on Aug. 2, 2022, which claims priority to and the benefit of Korean Patent Application No. 10-2021-0109013, filed on Aug. 18, 2021, the disclosure of which is incorporated herein by reference in its entirety. BACKGROUND To meet the increasing demand for wireless data traffic since the commercialization of 4th generation (4G) communication systems, the 5th generation (5G) system is being developed. For the sake of high, 5G system introduced millimeter wave (mmW) frequency bands (e. g. 60 GHz bands). In order to increase the propagation distance by mitigating propagation loss in the 5G communication system, various techniques are introduced such as beamforming, massive multiple-input multiple output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beamforming, and large-scale antenna. In addition, base station is divided into a central unit and plurality of distribute units for better scalability. To facilitate introduction of various services, 5G communication system targets supporting higher data rate and smaller latency. SUMMARY Aspects of the present disclosure are to address the problems of state transition from RRC_INACTIVE to RRC_CONNECTED for data transfer. Accordingly, an aspect of the present disclosure is to provide a method and an apparatus for data transfer in RRC_INACTIVE state. In accordance with an aspect of the present disclosure, a method of a terminal in mobile communication system is provided. The method comprises transmitting a UECapabilityInformation, receiving a RRCRelease the RRC release message includes a first information for a second resume procedure, receiving a system information the system information includes a first threshold and a second threshold, initiating a second resume procedure and cancelling triggered PHR. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a diagram illustrating the architecture of an 5G system and a NG-RAN to which the disclosure may be applied; FIG. 1B is a diagram illustrating a wireless protocol architecture in an 5G system to which the disclosure may be applied; FIG. 1C is a diagram illustrating an RRC state transition. FIG. 2A is a diagram illustrating operations of a terminal and a base station according to an embodiment of the present invention. FIG. 2B is a diagram illustrating a first resume procedure and a second resume procedure according to an embodiment of the present invention. FIG. 2C is a diagram illustrating a structure of an uplink MAC PDU used in a second resume procedure. FIG. 2D is a diagram illustrating a structure of a general uplink MAC PDU. FIG. 2E is a diagram illustrating a hierarchical structure of security keys. FIG. 2F is a diagram illustrating structures of a first BSR MAC CE and a second BSR MAC CE. FIG. 2G is a diagram illustrating structures of a third BSR MAC CE and a fourth BSR MAC CE. FIG. 2H is a diagram illustrating a MAC-I calculation process and ciphering process. FIG. 3 is a flow diagram illustrating an operation of a terminal. FIG. 4A is a block diagram illustrating the internal structure of a UE to which the disclosure is applied. FIG. 4B is a block diagram illustrating the configuration of a base station according to the disclosure. DETAILED DESCRIPTION Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in the description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, 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 invention, 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 explanation. Accordingly, the terms used in the following description are not limited to specific meanings but may be replaced by other terms equivalent in technical meanings. In the following descriptions, the terms and definitions given in the 3GPP standards are used for convenience of explanation. However, the present disclosure is not limited by use of these terms and definitions and other arbitrary terms and definitions may be employed instead. Table 1 lists the acronyms used throughout the present disclosure. TABLE 1Acro-Acro-nymFull namenymFull name5GC5G Core Netwo