Abstract:
PROVIDED ARE A BASE STATION, A TERMINAL, A BAND ALLOCATION METHOD, AND A DOWNLINK DATA COMMUNICATION METHOD IN WHICH A MAPPING METHOD FOR SYNCHRONIZATION SIGNALS AND REPORT SIGNALS IS IMPLEMENTED WITH HIGH RESOURCE USAGE EFFICIENCY WHEN A FIRST SYSTEM IN WHICH AN INDEPENDENT SINGLE COMMUNICATION IS ALLOCATED TO A UNIT BAND CO-EXISTS WITH A SECOND SYSTEM IN WHICH A PLURALITY OF UNIT BANDS CAN BE ALLOCATED TO A SINGLE COMMUNICATION. IN A BASE STATION (200), AN OFDM SIGNAL GENERATION UNIT (225) MAPS PRIMARY SYNCHRONIZATION CHANNEL (P-SCH), SECONDARY SYNCHRONIZATION CHANNEL (S-SCH), PRIMARY BROADCAST CHANNEL (P-BCH), AND DYNAMIC BROADCAST CHANNEL (D-BCH), WHICH CAN BE DECODED BY BOTH AN LTE TERMINAL AND AN LTE+ TERMINAL, TO SOME OF A PLURALITY OF UNIT BANDS AVAILABLE TO THE STATION ITSELF. THE OFDM SIGNAL GENERATION UNIT (225) ALSO MAPS D-BCH+, WHICH CAN BE DECODED ONLY BY AN LTE+ TERMINAL, TO ALL OF THE PLURALITY OF UNIT BANDS TO PRODUCE A MULTIPLEXED TRANSMISSION SIGNAL. WHEN THE TERMINAL WHICH HAS TRANSMITTED TERMINAL CAPABILITY INFORMATION IS AN LTE+ TERMINAL, A CONTROL UNIT (265) TRANSMITS A BAND MOVEMENT INDICATION WHICH INDICATES CHANGES IN THE RECEPTION BAND TO THAT TERMINAL.
Abstract:
When detecting occurrence of an event for transmitting a measurement report of a radio condition of a cell at a frequency set for a base station apparatus, to the base station apparatus (3) communicating with a terminal apparatus (2), the terminal apparatus (2) in a wireless communication system (1) creates a measurement report including information indicating radio conditions of cells at a frequency at which the event occurred and at another different frequency. The base station apparatus (3) controls whether or not to perform handover of the terminal apparatus (2) to another cell, on the basis of the measurement report transmitted from the terminal apparatus (2). Thereby, there is provided a wireless communication system in which a base station apparatus and the terminal apparatus are communicable with each other using multiple frequencies, the wireless communication system being capable of shortening time required for handover.
Abstract:
A cell selection system is for selecting a cell to be used for communications by a mobile terminal (1) in a network having a cell of a mobile phone network and a plurality of WLAN cells included in the cell. Broadcast information including cell selection information is transmitted in the cell of the mobile phone network. This cell selection information has cell change judgment parameters whose patterns are less than the WLAN cells. The mobile terminal (1) reads the cell selection information from the broadcast information of the mobile phone network, uses broadcast information of a WLAN to determine a parameter to be used for judgment on cell selection to the WLAN cell concerned, and judges by the determined parameter whether the cell can be changed or not. A cell reselection system is provided which can restrict the amount of data in the broadcast information even with an increase in the number of WLAN cells included in the cell of the mobile phone network.
Abstract:
Disclosed is a technique to enable a session handover between devices with different key generation functions in an authentication protocol. According to the technique, when a session where a UE (200) receives contents from a contents server (700) is to be handed over to a target node (300), the UE firstly transfers information (session HO information) necessary to the session handover to the target node (Step S1001). The target node performs authentication processing with an authentication server (600) of the network to which the UE is connected and notifies the authentication server of the session HO information transferred from the UE (Step S1003). The authentication server performs authentication for the session handover based on the session HO information, and when the authentication succeeds, the session is handed over from the contents server to the target node, and the contents are distributed to the target node (Step S1005).
Abstract:
Provided are a base station, a terminal, a band allocation method, and a downlink data communication method in which a mapping method for synchronization signals and report signals is implemented with high resource usage efficiency when a first system in which an independent single communication is allocated to a unit band co-exists with a second system in which a plurality of unit bands can be allocated to a single communication. In a base station (200), an OFDM signal generation unit (225) maps primary synchronization channel (P-SCH), secondary synchronization channel (S-SCH), primary broadcast channel (P-BCH), and dynamic broadcast channel (D-BCH), which can be decoded by both an LTE terminal and an LTE+ terminal, to some of a plurality of unit bands available to the station itself. The OFDM signal generation unit (225) also maps D-BCH+, which can be decoded only by an LTE+ terminal, to all of the plurality of unit bands to produce a multiplexed transmission signal. When the terminal which has transmitted terminal capability information is an LTE+ terminal, a control unit (265) transmits a band movement indication which indicates changes in the reception band to that terminal.