Patent ID: 8694003

Claim:
A method for setting a cause value for an RRC connection re-establishment request of an Long Term Evolution (LTE) terminal, wherein scenarios in which the LTE terminal needs to initiate an Radio Resource Control (RRC) connection re-establishment request including that: (1) a User Equipment (UE) detects radio link failure; (2) a cell handoff fails in Evolved-Universal Terrestrial Radio Access Network (E-UTRAN); (3) an Radio Link Control (RLC) identification reaches the maximum retransmission times, and needs to be reset; (4) RRC connection reconfiguration fails; wherein the RRC connection reconfiguration failure further including: (a) measurement configuration failure; (b) mobility control, including security configuration, i.e. handoff, failure; (c) non-access stratum dedicated information configuration failure; (d) dedicated radio resource configuration failure; and (e) UE-related information configuration failure; when scenario (1) and case (d) of scenario (4) occur, the LTE terminal adding a flag bit into an RRC connection re-establishment request message, indicating a failure reason is the radio resource failure; when scenario (2) and case (b) of scenario (4) occur, the LTE terminal adding a flag bit into an RRC connection re-establishment request message, indicating a failure reason is the handoff failure; when scenario (3) occurs, the LTE terminal adding a flag bit into an RRC connection re-establishment request message, indicating a failure reason is the bottom layer error; when case (a), (c), (e) of scenario (4) occur, the LTE terminal adding a flag bit into an RRC connection re-establishment request message, indicating a failure reason is the UE error.