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EP-4513819-B1 - METHOD AND APPARATUS FOR SMALL DATA TRANSMISSION, SDT

EP4513819B1EP 4513819 B1EP4513819 B1EP 4513819B1EP-4513819-B1

Inventors

  • KIM, TAEHUN
  • JEON, HYOUNGSUK
  • Dinan, Esmael Hejazi
  • RYU, Jinsook
  • TALEBI FARD, Peyman
  • PARK, KYUNGMIN

Dates

Publication Date
20260513
Application Date
20220729

Claims (15)

  1. An apparatus for a wireless device, the apparatus comprising: one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the wireless device to: process a radio resource control, RRC, message received by the wireless device from a base station, the RRC message comprising: a measurement configuration for one or more measurements by the wireless device while the wireless device is in an RRC inactive state; and a small data transmission, SDT, configuration of a SDT procedure for transmission by the wireless device while the wireless device is in the RRC inactive state; and while the wireless device is in the RRC inactive state: initiate the SDT procedure based on the SDT configuration; and not perform, during the SDT procedure, measurements associated with the measurement configuration.
  2. The apparatus of claim 1, wherein the instructions, when executed by the one or more processors, further cause the wireless device to perform the measurements associated with the measurement configuration: after the wireless device is in the RRC inactive state; and before the wireless device initiates the SDT procedure.
  3. The apparatus of claim 2, wherein the RRC message comprises an RRC release message, and wherein to perform the measurements is based on one or more of: the wireless device receiving the RRC release message; or the wireless device being in the RRC inactive state.
  4. The apparatus of claim 3, wherein the instructions, when executed by the one or more processors, further cause the wireless device to transition, based on the RRC release message, to the RRC inactive state.
  5. The apparatus of claim 3, wherein the instructions, when executed by the one or more processors, further cause the wireless device to start, based on the RRC release message, a measurement timer.
  6. The apparatus of claim 5, wherein the measurement timer is one or more of: a timer for measurement in the RRC inactive state; or T331.
  7. The apparatus of claim 6, wherein the instructions, when executed by the one or more processors, further cause the wireless device to perform the measurements associated with the measurement configuration while the measurement timer is running.
  8. The apparatus of one of claims 1 to 7, wherein the SDT configuration comprises at least one of: a next hop chaining count, NCC; a resume identity of the wireless device; and an indication indicating a radio bearer configured to the SDT procedure.
  9. A method comprising: receiving, by a wireless device from a base station, a radio resource control, RRC, message comprising: a measurement configuration for one or more measurements by the wireless device while the wireless device is in an RRC inactive state; and a small data transmission, SDT, configuration of a SDT procedure for transmission by the wireless device while the wireless device is in the RRC inactive state; and while the wireless device is in the RRC inactive state: initiating the SDT procedure based on the SDT configuration; and not performing, during the SDT procedure, measurements associated with the measurement configuration.
  10. The method of claim 9, further comprising causing the wireless device to perform the measurements associated with the measurement configuration: after the wireless device is in the RRC inactive state; and before the wireless device initiates the SDT procedure.
  11. The method of claim 10, wherein the RRC message comprises an RRC release message, and wherein the performing the measurements is based on one or more of: the wireless device receiving the RRC release message; or the wireless device being in the RRC inactive state.
  12. The method of claim 11, further comprising causing the wireless device to transition, based on the RRC release message, to the RRC inactive state.
  13. The method of claim 11, further comprising starting, by the wireless device, based on the RRC release message, a measurement timer.
  14. The method of claim 13, wherein the measurement timer is one or more of: a timer for measurement in the RRC inactive state; or T331.
  15. The method of claim 14, further comprising causing the wireless device to perform the measurements associated with the measurement configuration while the measurement timer is running.

Description

TECHNICAL FIELD This application relates to the field of wireless communication systems such as 4G communication systems (e.g., LTE), 5G communication systems, other communication systems compatible with 4G and/or 5G communication systems, and related methods, systems and apparatuses. BACKGROUND With regard to the prior art, reference is made to the 3GPP publications Intel Corp., "Signalling and NAS-AS interaction for SDT", in: 3GPP draft R2-2102841, 3GPP TSG RAN WG2 Meeting #113bis-e Electronic meeting, April 12-20, 2021, and ZTE Corp., "Introduction of SDT", in: 3GPP draft R2-2105927, 3GPP TSG-RAN WG2 Meeting #114e , Electronic meeting, May 19-27, 2021. Further reference is made to the 3GPP Technical Specification 3GPP TS 38.331 V16.5.0 (2021-06) which relates to New Radio (NR) and the Radio Resource Control (RRC) protocol specification. SUMMARY The invention is set out in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Examples of several of the various embodiments of the present disclosure are described herein with reference to the drawings. FIG. 1A and FIG. 1B illustrate example mobile communication networks in which embodiments of the present disclosure may be implemented.FIG. 2A and FIG. 2B respectively illustrate a New Radio (NR) user plane and control plane protocol stack.FIG. 3 illustrates an example of services provided between protocol layers of the NR user plane protocol stack of FIG. 2A.FIG. 4A illustrates an example downlink data flow through the NR user plane protocol stack of FIG. 2A.FIG. 4B illustrates an example format of a MAC subheader in a MAC PDU.FIG. 5A and FIG. 5B respectively illustrate a mapping between logical channels, transport channels, and physical channels for the downlink and uplink.FIG. 6 is an example diagram showing RRC state transitions of a UE.FIG. 7 illustrates an example configuration of an NR frame into which OFDM symbols are grouped.FIG. 8 illustrates an example configuration of a slot in the time and frequency domain for an NR carrier.FIG. 9 illustrates an example of bandwidth adaptation using three configured BWPs for an NR carrier.FIG. 10A illustrates three carrier aggregation configurations with two component carriers.FIG. 10B illustrates an example of how aggregated cells may be configured into one or more PUCCH groups.FIG. 11A illustrates an example of an SS/PBCH block structure and location.FIG. 11B illustrates an example of CSI-RSs that are mapped in the time and frequency domains.FIG. 12A and FIG. 12B respectively illustrate examples of three downlink and uplink beam management procedures.FIG. 13A, FIG. 13B, and FIG. 13C respectively illustrate a four-step contention-based random access procedure, a two-step contention-free random access procedure, and another two-step random access procedure.FIG. 14A illustrates an example of CORESET configurations for a bandwidth part.FIG. 14B illustrates an example of a CCE-to-REG mapping for DCI transmission on a CORESET and PDCCH processing.FIG. 15 illustrates an example of a wireless device in communication with a base station.FIG. 16A, FIG. 16B, FIG. 16C, and FIG. 16D illustrate example structures for uplink and downlink transmission.FIG. 17 illustrates an example of an RRC connection reestablishment procedure.FIG. 18 illustrates an example of an RRC connection resume procedure.FIG. 19 illustrates an example of subsequent small data transmission (SDT).FIG. 20A illustrates an example of a time window management of one or more subsequent transmissions of an SDT.FIG. 20B illustrates an example of a time window management of one or more subsequent transmissions of an SDT.FIG. 21 illustrates an example of idle/inactive measurement with SDT procedure.FIG. 22 illustrates an example of managing idle/inactive measurement with a SDT procedure.FIG. 23 illustrates an example of managing idle/inactive measurement using a timer based on a SDT procedure.FIG. 24 illustrates an example of detecting a failure of a SDT procedure with idle/inactive measurement.FIG. 25 illustrates an example of managing idle/inactive measurement with a SDT procedure.FIG. 26 illustrates an example of managing idle/inactive measurement using a timer with a SDT procedure. DETAILED DESCRIPTION In the present disclosure, various embodiments are presented as examples of how the disclosed techniques may be implemented and/or how the disclosed techniques may be practiced in environments and scenarios. It will be apparent to persons skilled in the relevant art that various changes in form and detail can be made therein without departing from the scope of the appended claims. In fact, after reading the description, it will be apparent to one skilled in the relevant art how to implement alternative embodiments. The present embodiments should not be limited by any of the described exemplary embodiments. The embodiments of the present disclosure will be described with reference to the accompanying drawings. Limitations, features, and/or elements from the disc