Method and device for judging radio link failure in carrier aggregation technology

Abstract

The present invention discloses a method and device for judging Radio Link Failure (RLF) in Carrier Aggregation (CA) technology, which are used to effectively judge whether a radio link is failed or not in CA technology. Said method comprises: on an evaluation point, comparing the determined radio link quality parameter of each carrier participating in the RLF judgement with the corresponding radio link quality parameter threshold, determining whether to trigger an in-sync indication or out-of-sync indication on the evaluation point, and judging whether the radio link of the User Equipment (UE) is failed according to the number of the continuously received in-sync indications or out-of-sync indications. The embodiment of the present invention determines whether to trigger an in-sync indication or out-of-sync indication by comparing the radio link quality parameters of the carriers participating in the RLF judgement with the corresponding radio link quality parameter thresholds, and thereby judges that whether the radio link is failed or not in CA technology.

1 . A method for judging radio link failure in carrier aggregation, comprising:
 a User Equipment, UE, determining radio link quality parameter of carrier involved in judgment of radio link failure, wherein the radio link quality parameter of the carrier involved in the judgment is obtained by measuring a cell-specific reference signal of the carrier more than once within each evaluation period and filtering measurement results on an evaluation point of each evaluation period, the evaluation point is an end of the evaluation period;   the UE comparing on evaluation points each determined radio link quality parameter with a corresponding radio link quality parameter threshold and determining whether to trigger an in-sync indication or an out-of-sync indication on the evaluation points; and   judging failure of a radio link of the UE when the UE does not receive continuously a preset number of in-sync indications in a preset judgment length of time:   wherein the determining radio link quality parameter of the carrier involved in judgment of radio link failure comprises:   determining a primary carrier of the UE as a carrier involved in judgment of radio link failure, measuring the cell-specific reference signal of the primary carrier more than once within the evaluation period, and filtering measurement results on the evaluation point of the evaluation period to obtain the radio link quality parameter corresponding to the primary carrier.   
     
     
         2 . (canceled) 
     
     
         3 . The method of  claim 1 , wherein the UE comparing on evaluation points each determined radio link quality parameter with a corresponding radio link quality parameter threshold and determining whether to trigger an in-sync indication or an out-of-sync indication on the evaluation points comprises:
 the UE on the evaluation points determining an out-of-sync indication to be triggered if the radio link quality parameter of the primary carriers is below a first radio link quality parameter threshold corresponding to the primary carrier, or an in-sync indication to be triggered if the radio link quality parameter of the primary carrier is above a second radio link quality parameter threshold corresponding to the primary carrier, or neither in-sync indication nor out-of-sync indication to be triggered if the radio link quality parameter of the primary carrier is between the first radio link quality parameter threshold and the second radio link quality parameter threshold, wherein the second radio link quality parameter threshold is above the first radio link quality parameter threshold.   
     
     
         4 . (canceled) 
     
     
         5 . The method of  claim 1 , wherein the UE judging failure of a radio link of the UE when a preset number of in-sync indications are not received continuously in a preset length of time comprises:
 the UE enabling a tuner to monitor for the preset length of time upon continuous reception of a first number of out-of-sync indications; and   judging failure of the radio link of the UE when a second number of in-sync indications are not received continuously during operation of the timer.   
     
     
         6 . The method of  claim 5 , wherein the first number, the second number and the timer are configured at the network side in Radio Resource Control, RRC, signaling. 
     
     
         7 . The method of  claim 5 , wherein the first number is configured at the network side according to a preset number of times that the primary carrier of the UE is involved in comparison of the radio link quality parameter. 
     
     
         8 . The method of  claim 7 , wherein the preset number of times is no smaller than one:
 a correspondence relationship between the Discontinuous Reception, DRX, period of the carrier and the preset number of times; or   the longest DRX period and the shortest DRX period of the respective carriers of the UE.   
     
     
         9 . The method of  claim 1 , wherein determining the evaluation points comprises:
 determining the evaluation points according to the DRX mode of the primary carrier.   
     
     
         10 . (canceled) 
     
     
         11 . The method of  claim 1 , wherein the carrier comprise:
 an activated carrier configured at the Radio Resource Control, RRC, layer of the network side, wherein the activated carrier is the carrier on which the UE performs uplink and downlink transmission and performs CQI measurement; or   an independently operating carrier, wherein the independently operating carrier is the carrier which operates as independent cell without relying on another carrier; or   an primary carrier configured at the RRC layer of the network side.   
     
     
         12 . A device for judging radio link failure in carrier aggregation, comprising:
 a determining module configured to determine radio link quality parameter of a carrier involved in judgment of radio link failure, wherein the radio link quality parameter of the carrier involved in the judgment is obtained by measuring a cell-specific reference signal of the carrier more than once within each evaluation period and filtering measurement results on an evaluation point of each evaluation period, the evaluation point is an end of the evaluation period;   a triggering module configured to compare on evaluation points each determined radio link quality parameter with a corresponding radio link quality parameter threshold and to determine whether to trigger an in-sync indication or an out-of-sync indication on the evaluation points; and   a judging module configured to judge failure of a radio link of a User Equipment, UE, when a preset number of in-sync indications are not received continuously in a preset judgment length of timer;   wherein the determining module is further configured to determine a primary carrier of the user equipment as a carrier involved in judgement of radio link failure, to measure the cell-specific reference signal of the primary carrier more than once within the evaluation period, and to filter measurement results on the evaluation point of the evaluation period to obtain the radio link quality parameter corresponding to the primary carrier.   
     
     
         13 . (canceled) 
     
     
         14 . The device of  claim 12 , wherein the triggering module is configured to determine on the evaluation points an out-of-sync indication to be triggered if the radio link quality parameter of the primary carrier is below a first radio link quality parameter threshold corresponding to the primary carrier, or an in-sync indication to be triggered if the radio link quality parameter of the primary carrier is above a second radio link quality parameter threshold corresponding to the primary carrier, or nether in-sync indication nor out-of-sync indication to be triggered if the radio link quality parameter of the primary carrier is between the first radio link quality parameter threshold and the second radio link quality parameter threshold, wherein the second radio link quality parameter threshold is above the first radio link quality parameter threshold. 
     
     
         15 . (canceled) 
     
     
         16 . The device of  claim 12 , wherein the triggering module further comprises:
 an evaluation point determining unit configured to determine the evaluation points according to the DRX mode of the primary carrier.   
     
     
         17 . (canceled) 
     
     
         18 . The device of  claim 12 , wherein the judging module comprises:
 an enabling unit configured to enable a timer to monitor for the preset length of time upon continuous reception of a first number of out-of-sync indications; and   a judging unit configured to judge failure of the radio link of the UE when a second number of in-sync indications are not received continuously during operation of the timer.