Scell radio link monitoring and radio link failure handling

Abstract

A method of radio link monitoring (RLM) and radio link failure (RLF) handling over a secondary serving cell (SCELL) is proposed. In a wireless network, a user equipment (UE) establishes a radio resource control (RRC) connection with a base station (eNB). The UE applies carrier aggregation for multiple component carriers (CCs) configured as multiple serving cells. The UE performs radio link monitoring over a primary serving cell (PCELL). The UE also performs radio link monitoring over a secondary serving cell (SCELL). The SCELL belongs to a CC group of one or more CCs, and used as a reference cell for the CC group. When SCELL performance is below pre-defined criteria, the UE and the eNB apply certain actions over the SCELL or all CCs in the CC group. The proposed SCELL RLM / RLF handling prevents spurious and uncontrollable uplink SCELL transmission and interference to other UEs.

Description

[0001] cross reference [0002] The claims of this application are based on 35 U.S.C. §119 requiring priority of U.S. Provisional Application No. 61 / 481,850, filed May 3, 2011, titled "Secondary Serving Cell Radio Link Monitoring and Radio Link Failure Handling" right, and this application is incorporated by reference. technical field [0003] The present invention relates to Radio Link Monitoring (RLM) and Radio Link Failure (RLF) handling, and in particular to Secondary Serving Cell with Carrier Aggregation (CA) , RLM and RLF processing in SCELL). Background technique [0004] In the third generation mobile communication cooperation plan (3 rd In the Long Term Evolution (LTE) network of Generation Partnership Project, 3GPP), the Evolved Universal Terrestrial Radio Access Network (Evolved Universal Terrestrial Radio Access Network, E-UTRAN) may include multiple base stations, for example, to communicate with multiple mobile An evolved base station (evolved Node-B, eNB)...

AI Technical Summary

Problems solved by technology

RLF detection when a physical layer problem occurs is only used for PCELL, and cannot prevent SCELL from interfering with other users when it is out-of-sync

For example, if a radio link problem occurs in the DL SCELL used as a timing reference cell, it will cause wrong UL timing, causing inter symbol interference to other users

Similarly, if a radio link problem occurs in the DL SCELL used as a path loss reference cell, it will cause wrong path loss estimation and the UL SCELL transmission may appear spurious, causing interference to other users

Also, RLF detection when random access problem occurs is only applied to PCELL

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