A method for setting a cause value for an RRC connection re-establishment request of an LTE terminal, wherein scenarios in which the LTE terminal needs to initiate an RRC connection re-establishment request including that: (1) a UE detects radio link failure; (2) a cell handoff fails in E-UTRAN; (3) an 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 is 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.
