Radio communication system, radio station, radio terminal, communication control method, and computer readable medium
A technology for radio terminals and radio stations, applied in wireless communication, diversity/multi-antenna systems, electrical components, etc., to solve the problem of not knowing whether the UE is executing
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no. 1 example
[0053] figure 1 A configuration example of a radio communication system according to the present embodiment is shown. The radio communication system according to the present embodiment includes a first radio station 1 , a second radio station 2 , and a radio terminal 3 . The radio stations 1 and 2 operate a first cell 10 and a second cell 20 respectively. The radio stations 1 and 2 are, for example, radio base stations or base station controllers. The radio terminal 3 is configured to establish a second radio connection on the second cell 20 while maintaining the first radio connection on the first cell 10 . This allows the radioterminal 3 to use multiple cells (eg cells 10 and 20) simultaneously for sending or receiving any signal (eg user data or control information). In other words, the radio terminal 3 supports carrier aggregation of cells operated by different radio stations.
[0054] Notice, figure 1 Shows the HetNet environment. in particular, figure 1 The fir...
no. 2 example
[0111] In this embodiment, an example in which the first embodiment is applied to a 3GPP LTE system will be described. A structural example of the radio communication system according to the present embodiment may be similar to figure 1 shown in . Note that radio stations 1 and 2 correspond to eNBs, and radio terminal 3 corresponds to UE. Information exchange between radio stations (ie, between eNBs) may be performed using X2 as a direct interface, may be performed via a core network using S1 as an interface, or may be performed using a newly defined interface (eg, X3). The radio terminal (UE) 3 supports carrier aggregation (inter-eNB CA) of cells operated by different radio stations (eNB). Note that "inter-eNB CA" as used herein is not limited to the manner in which signals are simultaneously received or transmitted on cells of different eNBs. Alternatively, although UE 3 may receive or transmit signals on two cells of different eNBs, it includes the manner of actually re...
no. 3 example
[0145] In this embodiment, a modification of the second embodiment is described. In this embodiment, a description will be given of the bearer between the radio stations 1 and 2 and the upper network and the setting of the bearer in the upper network. For the transmission of user data, bearers are associated with first and second radio connections (i.e. data radio bearers (Evolved Packet System Radio Bearers: EPSRB)) on the cells 10 and 20, which are configured by the procedure described in the second embodiment .
[0146] In the LTE system, the S1 bearer is used to transmit user data between a radio station (eNB) 1 or 2 and an upper layer network (Evolved Packet Core: EPC). An S1 bearer is established between a data transmission device (ie, serving GW: S-GW) in an upper layer network and an eNB. Also, in the LTE system, an S5 / S8 bearer is established between two data transmission devices in the EPC (ie, S-GW and P-GW (Packet Data Network Gateway)). The EPS RB and S1 bearer...
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