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EP-4154579-B1 - RADIO RESOURCE MANAGEMENT RELAXATION FOR RADIO RESOURCE CONTROL CONNECTED MODE

EP4154579B1EP 4154579 B1EP4154579 B1EP 4154579B1EP-4154579-B1

Inventors

  • LI, QIMING
  • CUI, JIE
  • ZHANG, DAWEI
  • HE, HONG
  • NIU, HUANING
  • RAGHAVAN, Manasa
  • CHEN, XIANG
  • TANG, YANG

Dates

Publication Date
20260506
Application Date
20210805

Claims (13)

  1. A processor (205) for a reduced capability, redcap, user equipment, UE (110), configured to perform operations comprising: receiving a measurement configuration from a serving cell (120A), wherein the measurement configuration comprises event configuration associated with radio resource management, RRM, relaxation for radio resource control, RRC, connected mode; performing measurements of the serving cell (120A); determining whether an event criteria comprised in the event configuration has been satisfied based on the measurements; when the event criteria has been satisfied, transmitting a measurement report to the serving cell (120A) to indicate that RRM relaxation criteria has been satisfied; receiving an indication from the serving cell (120A) that the RRM relaxation for RRC connected mode is enabled at the redcap UE (110),wherein the indication from the serving cell (120A) comprises a single bit flag for enabling RRM relaxation; and determine that one of multiple RRM relaxation scheme types is to be enabled based on the indication from the serving cell (120A) and at least one of connected discontinuous reception, C-DRX, parameters, and measurement gap parameters.
  2. The processor (205) of claim 1, wherein the measurement report comprises one or more of a stationary mobility status for the redcap UE (110) and a not-at-cell edge status for the redcap UE (110).
  3. The processor (205) of either of claims 1 or 2, the operations further comprising: transmitting, after RRM relaxation for RRC connected mode is enabled, a second measurement report to the serving cell (120A), wherein the second measurement report comprises an event ID associated with disabling RRM relaxation for RRC connected mode.
  4. The processor (205) of any of claims 1-3, the operations further comprising: transmitting, after RRM relaxation for RRC connected mode is enabled, a second measurement report to the serving cell (120A), wherein the second measurement report comprises one or more of a leave stationary mobility status for the redcap UE (110) and a leave not-at-cell edge status for the redcap UE (110).
  5. The processor (205) of any of claims 1-3, the operations further comprising: transmitting, after RRM relaxation for RRC connected mode is enabled, a second measurement report to the serving cell (120A), wherein the second measurement report comprises a type of RRM relaxation scheme to be disabled at the redcap UE (110).
  6. The processor (205) of any preceding claim, wherein RRM relaxation for RRC connected mode comprises applying a scaling factor to one or more of a primary synchronization signal (PSS)/secondary synchronization signal, SSS, detection time configuration, a synchronization signal block, SSB, measurement time configuration or a time index detection configuration.
  7. The processor (205) of claim 6, wherein, during RRM relaxation for RRC connected mode, discontinuous reception, DRX, is not configured and measurement gaps are not used by the redcap UE (110).
  8. The processor (205) of claim 6, wherein, during RRM relaxation for RRC connected mode, discontinuous reception, DRX, is configured at the redcap UE (110) and measurement gaps are not used at the redcap UE (110).
  9. The processor (205) of claim 6, wherein, during RRM relaxation for RRC connected mode, discontinuous reception, DRX, is not configured at the redcap UE (110) and measurement gaps are used at the redcap UE (110).
  10. The processor (205) of claim 6, wherein, during RRM relaxation for RRC connected mode, discontinuous reception, DRX, is configured at the redcap UE (110) and measurement gaps are configured at the redcap UE (110).
  11. The processor (205) of any of claims 1-6, wherein RRM relaxation for RRC connected mode comprises applying a scaling factor to a discontinuous reception, DRX, cycle periodicity.
  12. The processor (205) of any preceding claim, wherein RRM relaxation for RRC connected mode comprises applying a scaling factor to a measurement gap repetition period, MGRP.
  13. A reduced capability, redcap, user equipment, UE (110), comprising: a transceiver (225) configured to communicate with a serving cell (120A); and the processor (205) of any preceding claim.

Description

TECHNICAL FIELD This application relates generally to wireless communication, and in particular relates to Radio Resource Management Relaxation For Radio Resource Control Connected Mode. BACKGROUND A new radio (NR) network may support a reduced capability (redcap) user equipment (UE). It has been identified that it may be beneficial to implement radio resource management (RRM) relaxation for redcap UEs operating in radio resource control (RRC) connected mode. Those skilled in the art will understand that RRM relaxation refers to a Third Generation Partnership Project (3GPP) concept in which a UE is subject to relaxed RRM requirements under certain conditions. There exists a need for techniques configured to facilitate the implementation of RRM relaxation for redcap UEs in RRC connected mode. The following documents are relevant: US 2021/105649 A1 which discusses a method and an apparatus for reporting relaxed measurement in a wireless communication system, 3GPP DRAFT; R2-2105521 contribution by SHARP which discusses RRM relaxation in RRC_CONNECTED for RedCap UEs, 3GPP Technical Specification 38.331, 3GPP DRAFT; R2-2104060; Contribution by HUAWEI ET AL which discusses RRM measurement relaxation for RedCap UE, 3GPP DRAFT; R4-2006516; Contribution by VIVO which discusses remaining issued on NR UE power saving, and 3GPP DRAFT; R2-2104361; contribution by QUALCOMM INCORPORATED which pertains to a summary of RRM relaxations. SUMMARY The essential features of the invention are outlined by the appended independent claims. Some exemplary embodiments are related to a processor of a user equipment (UE) configured to perform operations. The operations include receiving a measurement configuration from a serving cell, wherein the measurement configuration comprises event configuration associated with radio resource management (RRM) relaxation, performing measurements of the serving cell, transmitting a measurement report to the serving cell and receiving an indication from, the serving cell that RRM relaxation for radio resource control (RRC) connected mode is enabled at the UE. Other exemplary embodiments are related to a user equipment (UE) having a transceiver configured to communicate with a serving cell and a processor communicatively coupled with the transceiver and configured to perform operations. The operations include receiving a measurement configuration from the serving cell, wherein the measurement configuration comprises event configuration associated with radio resource management (RRM) relaxation, performing measurements of the serving cell, transmitting a measurement report to the serving cell and receiving an indication from the serving cell that RRM relaxation for radio resource control (RRC) connected mode is enabled at the UE. Brief Description of the Drawings Fig. 1 shows an exemplary network arrangement according to various exemplary embodiments.Fig. 2 shows an exemplary user equipment (UE) according to various exemplary embodiments.Fig. 3 shows an exemplary base station according to various exemplary embodiments.Fig. 4 shows a signaling diagram for enabling and disabling radio resource management (RRM) relaxation according to various exemplary embodiments.Fig. 5 shows an example abstract syntax notation one (ASN.1) for event configuration information according to various exemplary embodiments.Fig. 6 shows a method for implementing RRM relaxation according to various exemplary embodiments. Detailed Description The exemplary embodiments may be further understood with reference to the following description and the related appended drawings, wherein like elements are provided with the same reference numerals. The exemplary embodiments relate to radio resource management (RRM) relaxation. Those skilled in the art will understand that the term "RRM relaxation" generally refers to the Third Generation Partnership Project (3GPP) concept in which a user equipment (UE) is subject to relaxed RRM requirements under certain conditions. To provide one example, when RRM relaxation is enabled, the UE may be configured to perform measurements and/or monitor for reference signals less frequently compared to other RRM measurement configurations. In one aspect, the exemplary embodiments introduce techniques for implementing a RRM relaxation scheme for RRC connected mode. Those skilled in the art will understand that "RRC" refers to radio resource control protocols and the UE may be configured to be in one of multiple different types of RRC operating modes (or states), e.g., RRC idle mode, RRC inactive mode, RRC connected mode, etc. In RRC connected mode, the UE and the network may exchange information (e.g., control information) and/or data. The exchange of information and/or data may allow the UE to perform a wide variety of different functionalities available via the network connection. In RRC idle mode, the UE is generally not exchanging data with the network and radio resources are not being assigned to the UE w