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Content for  TR 44.901  Word version:  16.0.0

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1  ScopeWord‑p. 6

This Technical Report provides background information, motivations, concepts and requirements regarding an extended Network Assisted Cell Change (NACC) feature for external cell change support. Cell change between GERAN and UTRAN cells is outside the scope of this report, although consideration has been taken in order to allow an easier extensibility to that case. The extension is based on the Release 4 version of the NACC feature where the mobile station is only supported by the NACC when performing internal cell re-selection, i.e. within a BSC. The extension of the feature is for GERAN just affecting BSS and for the core network the SGSN and signalling links between these network nodes. To support cell changes between GERAN and UTRAN, also the Um and the Uu interfaces are affected.
The evolved Release 4 NACC proposal as described in this TR provides the basis for the detailed Stage 2 and stage 3 specification work. The feature will be developed in a phased approach and a longer-term vision is presented in the report.
The focus of the TR is to:
  • Define the requirements on different nodes
  • Specify the requirements for the interfaces
  • Propose a plan for the work item project
  • Evaluation of what does and does not need to be standardised

2  References

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.
3GPP TD GP-010361: "Network Assisted Cell Change; Concept document"
TS 48.018: "General Packet Radio Service (GPRS); BSS GPRS Protocol (BSSGP)".

3  Definitions and abbreviations

3.1  Definitions

For the purposes of the present document, the following definitions apply:
External cell change:
Change of cells where old and new cell do not belong to the same BSC.
External neighbouring cells:
Cells listed in the BA-lists within a BSC that belongs to other BSCs.
Extended neighbouring cell list:
List of System information received from the external neighbour cells to be used in the Network Assisted Cell Change procedure.
Service outage time:
The time between the last received uplink RLC block from the mobile station in the old cell and the mobile station's first uplink RLC block received in the new cell.

3.2  AbbreviationsWord‑p. 7

For the purposes of the present document, the following abbreviations apply:
Cell Change Notification
Enhanced Data rates for GSM Evolution
GSM/EDGE Radio Access Network
General Packet Radio Service
Network Assisted Cell Change
Network Control mode (can be NC0, NC1 or NC2)
Operations and Maintenance
Packet Associated Common Control Channel
Packet Switched
Quality of Service
Radio Network
Radio Access Network
RAN Information Management
User Equipment
Universal Terrestrial Radio Access Network

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