Content for  TR 23.700-68  Word version:  18.1.0

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1  Scopep. 7

The scope of the present document is to investigate solutions to support of RRC INACTIVE state with extended DRX cycle longer than 10.24s to enrich the power saving function as studied in TR 38.875.
This study will address the following objective:
Support for enabling of eDRX cycle that is longer than 10.24s in RRC_INACTIVE state with following two aspects:
  1. Study the support of the eDRX cycle that is longer than 10.24s and up to 10485.76s for RRC_INACTIVE state for RAN paging (e.g. PTW and eDRX cycle values).
  2. Study the MT signalling and data handling for UE with long eDRX cycle in RRC_INACTIVE state.

2  Referencesp. 7

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 23.501: "System Architecture for the 5G System; Stage 2".
TS 23.502: "Procedures for the 5G System; Stage 2".
TS 38.300: "NR; NR and NG-RAN Overall Description; Stage 2".
TR 38.875: "Study on support of reduced capability NR devices".
TS 38.413: "NG-RAN; NG Application Protocol (NGAP)".

3  Definitions of terms and abbreviationsp. 7

3.1  Termsp. 7

For the purposes of the present document, the terms given in TR 21.905 apply.

3.2  Abbreviationsp. 7

For the purposes of the present document, the abbreviations given in TR 21.905 apply.

4  Architectural Assumptions and Requirementsp. 7

The following architectural assumptions and requirements apply:
  • The current 3GPP system architecture in TS 23.501 and TS 23.502 is applied.
  • Solutions are applicable to UE accessing 5GC via gNB.

5  Key Issuesp. 8

5.1  Key Issue #1: Enabling long eDRX cycle support in RRC_INACTIVE statep. 8

5.1.1  General descriptionp. 8

To enable the support of long eDRX cycle (e.g. longer than 10.24s) in RRC_INACTIVE state with the power saving benefit studied in TR 38.875, following aspects need to be studied:
  • How the long eDRX cycle values which are longer than 10.24s are supported in RRC_INACTIVE state.
  • How MT signalling and data are handled for a UE with a long eDRX cycle value in RRC_INACTIVE state, e.g. enhancement to enable extended MT data buffering for UE in RRC_INACTIVE state.

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