Radio communication system, radio station, radio terminal, communication control method, and computer readable medium
A technology of radio terminals and radio stations, applied in wireless communication, diversity/multi-antenna systems, electrical components, etc.
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no. 1 example
[0055] figure 1 A configuration example of a radio communication system according to this embodiment is illustrated. The radio communication system according to this embodiment includes a radio network 6 and radio terminals 4 . The radio network 6 includes a first radio station 1 , a second radio station 2 , a third radio station 3 , and a core network 5 connected to the radio stations 1 to 3 . The radio stations 1 , 2 and 3 each serve a first cell 10 , a second cell 20 and a third cell 30 . The radio stations 1 to 3 are, for example, radio base stations or base station controllers. The radio terminal 4 has a capability of using a cell of one radio station as a primary cell (PCell) while using a cell of another radio station as a secondary cell (SCell). In other words, the radio terminal 4 supports carrier aggregation over multiple cells served by different radio stations. A primary cell (PCell) is a cell that has been used as a serving cell of the radio terminal 4 at the...
example 1
[0089] In procedure example 1, the radio terminal 4 and the radio network 6, while changing the SCell of the radio terminal 4 from the second cell 20 to the third cell 30, maintain information on the SCell before the change (i.e., the second cell 20). The communication status information of the radio terminal 4, and then resume the communication (service) that had been provided in the SCell (ie, the second cell 20) before the change in the SCell (ie, the third cell 30) after the change.
[0090] Figure 6 is a flowchart illustrating an example of the operation of the radio terminal 4 according to the procedure example 1. In step S101 , the radio terminal 4 (communication control unit 45 ) receives an instruction for changing the Scell to the third cell 30 from the radio network 6 . In step S102 , the radio terminal 4 (communication control unit 45 ) initiates a process for changing the SCell to the cell 30 while maintaining the communication state information on the cell 10...
example 2
[0095] Procedure Example 2 corresponds to a more specific example of Procedure Example 1 described above. Figure 9 is a flowchart of an example of the operation of the radio terminal 4 according to the procedure example 2. In step S401 , the radio terminal 4 (communication control unit 45 ) receives an instruction for changing the SCell to the third cell 30 from the first radio station 1 on the first cell 10 . In step S402, the radio terminal 4 (communication control unit 45) holds communication state information of data communication (service B) that has been provided in the SCell (second cell 10). In step S403 , the radio terminal 4 (communication control unit 45 ) initiates changing the SCell from the second cell 20 to the third cell 30 . When the change of the SCell is completed (Yes in step S404), the radio terminal 4 (communication control unit 45) continues the data communication that has been performed in the SCell before the change in the cell 30 based on the commun...
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