Mobile station apparatus, base station apparatus, and radio link synchronization determining method

Abstract

While a mobile station apparatus is receiving a plurality of frequency bands, effective determinations of wireless link synchronization can be achieved. The mobile station apparatus measures the reception qualities of a plurality of different downlink frequency band signals (DL_CC 1 , DL_CC 2 ) transmitted by one or more base station apparatuses and by the foregoing base station apparatuses. If all of the measured reception qualities are below a threshold value (Qout) (threshold value for determining downlink synchronizations), the mobile station apparatus determines that a downlink synchronization error has occurred, and then causes the downlink synchronization state to transition to an error detection part. If the mobile station apparatus successively detects the downlink synchronization error a predetermined number of times, then the mobile station apparatus causes the downlink synchronization state to transition to a synchronization protection part and simultaneously starts a downlink synchronization protection timer. If no downlink synchronization has been recovered by the expiration of the downlink synchronization protection timer, the mobile station apparatus determines that an out-of-downlink-synchronization has occurred, and then releases individually designated radio resources and thereafter starts a cell reselection.

1 .- 13 . (canceled) 
     
     
         14 . A mobile station apparatus communicating with base station apparatuses, comprising:
 a determining section that measures reception qualities of cells of frequency bands of a plurality of downlinks having different frequencies which are connected to the base station apparatuses,   the determining section detecting a downlink synchronization error or a downlink synchronization recovery used for determination of a downlink synchronization state for each cell of downlink frequency bands by comparing the reception qualities of the cells of the plurality of downlink frequency bands with a downlink synchronization error determining threshold value and a downlink synchronization recovery determining threshold value for each cell of down link frequency bands,   the determining section starting timing of a timer of each cell of downlink frequency band if the downlink synchronization error is consecutively detected for a certain number of times, the determining section determining the downlink synchronization state as a downlink synchronization loss of each cell of downlink frequency bands when the timer of each cell of downlink frequency bands is expired, the determining section determining the downlink synchronization state as a downlink synchronization loss to release a radio resource and start reconnection when the timers are expired in all the measured downlink frequency bands,   the determining section stopping the timing of the timer of each cell of the downlink frequency bands to determine the downlink synchronization state as downlink synchronization of each cell of downlink frequency bands if the downlink synchronization recovery of each cell of the downlink frequency bands is consecutively detected for a certain number of times during the timing of the timer of each cell of the downlink frequency bands.   
     
     
         15 . A mobile station apparatus communicating with base station apparatuses, wherein
 the mobile station apparatus measures reception qualities of cells of frequency bands of a plurality of downlink having different frequencies which are connected to the base station apparatuses,   detects a first determination information indicating quality deterioration of a downlink that is used for determining a state of radio link of the mobile station apparatus or a second information indicating recovery of quality of the downlink for each cell from the reception qualities based on reception quality of each cell designated by the base station apparatus,   when a timer that starts timing for the each cell if the first determination information is detected consecutively for a certain number of times is expired, the mobile station apparatus determines that a downlink corresponding to the cell is out of synchronization and stops a transmission of an uplink of the cell if the state of radio link of the mobile station apparatus is not determined as loss of synchronization, and starts reconnection procedure by releasing radio resources of the cell if the state of radio link of the mobile station apparatus is determined as loss of synchronization.   
     
     
         16 . A mobile station apparatus communicating with base station apparatuses, wherein
 the mobile station apparatus measures reception qualities of cells of frequency bands of a plurality of downlinks having different frequencies which are connected to the base station apparatuses,   detects a first determination information indicating quality deterioration of a downlink that is used for determining a state of radio link of the mobile station apparatus or a second information indicating recovery of quality of the downlink for each cell from the reception qualities based on reception quality of each cell designated by the base station apparatus,   when a timer that starts timing for the each cell if the first determination information is detected consecutively for a certain number of times is expired, the mobile station apparatus stops a transmission of an uplink of the cell if the state of radio link of the mobile station apparatus is not determined as loss of synchronization, and restarts a transmission of an uplink of the cell if the second determination information is detected consecutively for a certain number of times.   
     
     
         17 . A base station apparatus connected to the mobile station apparatus as defined in any one of  claims 14  to  16 , wherein the base station apparatus determines interrupted data destined for the mobile station apparatus based on a cell ID and a mobile station apparatus ID provided from the mobile station apparatus to resume transmission of the data when performing reconnection procedure. 
     
     
         18 . A radio link synchronization determining method in a mobile station apparatus communicating with base station apparatuses, comprising:
 a step of measuring reception qualities of cells of frequency bands of a plurality of downlinks having different frequencies which are connected to the base station apparatuses,   a step of detecting a downlink synchronization error or a downlink synchronization recovery used for determination of a downlink synchronization state for each cell of downlink frequency bands by comparing the reception qualities of the cells of the plurality of downlink frequency bands with a downlink synchronization error determining threshold value and a downlink synchronization recovery determining threshold value for each cell of downlink frequency bands,   a step of starting timing of a timer of each cell of downlink frequency band if the downlink synchronization error is consecutively detected for a certain number of times, determining the downlink synchronization state as a downlink synchronization loss of each cell of downlink frequency bands when the timer of each cell of downlink frequency bands is expired, and determining the downlink synchronization state as a downlink synchronization loss to release a radio resource and start reconnection when the timers are expired in cells of all the measured downlink frequency bands, and   a determining step of stopping the timing of the timer of each cell of downlink frequency bands to determine the downlink synchronization state as downlink synchronization of each cell of downlink frequency bands if the downlink synchronization recovery of each cell of the downlink frequency bands is consecutively detected for a certain number of times during the timing of the timer of each cell of downlink frequency bands.   
     
     
         19 . A radio link synchronization determining method in a mobile station apparatus communicating with base station apparatuses, comprising:
 a step of measuring reception qualities of cells of frequency bands of a plurality of downlink having different frequencies which are connected to the base station apparatuses,   a step of detecting a first determination information indicating quality deterioration of a downlink that is used for determining a state of radio link of the mobile station apparatus or a second information indicating recovery of quality of the downlink for each cell from the reception qualities based on reception quality of each cell designated by the base station apparatus,   when a timer that starts timing for the each cell if the first determination information is detected consecutively for a certain number of times is expired,   a step of determining that a downlink corresponding to the cell is out of synchronization and stopping a transmission of an uplink of the cell if the state of radio link of the mobile station apparatus is not determined as loss of synchronization and detecting the first determination information or the second determination information for each cell based on respective reception qualities of other cells, and   a step of starting reconnection procedure by releasing radio resources of the cell if the state of radio link of the mobile station apparatus is determined as loss of synchronization.   
     
     
         20 . A radio link synchronization determining method in a mobile station apparatus communicating with base station apparatuses, comprising:
 a step of measuring reception qualities of cells of frequency bands of a plurality of downlink having different frequencies which are connected to the base station apparatuses,   a step of detecting a first determination information indicating quality deterioration of a downlink that is used for determining a state of radio link of the mobile station apparatus or a second information indicating recovery of quality of the downlink for each cell from the reception qualities based on reception quality of each cell designated by the base station apparatus,   when a timer that starts timing for the each cell if the first determination information is detected consecutively for a certain number of times is expired,   a step of stopping a transmission of an uplink of the cell if the state of radio link of the mobile station apparatus is not determined as loss of synchronization, and   a step of restarting a transmission of an uplink of the cell if the second determination information is detected consecutively for a certain number of times.