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随机接入过程.docx

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摘自3GPP -930
Random Access Procedure
The random access procedure is characterized by:
- Common procedure for FDD and TDD;
- One procedure irrespective of cell size;
The random access procedure is performed for the following six events:
- Initial access from RRC_IDLE;
- RRC Connection Re-establishment procedure;
- Handover;
- DL data arrival during RRC_CONNECTED requiring random access procedure;
- . when UL synchronisation status is “non-synchronised”;
- UL data arrival during RRC_CONNECTED requiring random access procedure;
- . when UL synchronisation status is "non-synchronised" or there are no H resources for SR available.
- For positioning purpose during RRC_CONNECTED requiring random access procedure;
- . when timing advance is needed for UE positioning;
Furthermore, the random access procedure takes two distinct forms:
- Contention based (applicable to first five events);
- Non-contention based (applicable to only handover, DL data arrival and positioning).
Normal DL/UL transmission can take place after the random access procedure.
Contention based random access procedure
The contention based random access procedure is outlined on Figure -1 below:
Figure -1: Contention based Random Access Procedure
The four steps of the contention based random access procedures are:
1) Random Access Preamble on RACH in

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