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US 2009/0023382 A1Published application
Radio Communication System and Base Station
AssigneeHitachi Communication Technologies, Ltd.
InventorsAkihiko YOSHIDA, Shiro Mazawa, Kiyoshi Kawamoto, Yosuke Takahashi, Keiji Usuba
Life of this patent
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Abstract
A radio communication system includes a grouping unit for grouping a plurality of base stations into a plurality of groups (Soft Handoff Groups) and a determining unit for selecting base stations belonging to one and the same group selected from the groups produced by the grouping unit and for determining the base stations as base stations to send communication packets to an access terminal.
Claims5
A radio communication system including:
- a plurality of base stations;
- a communication controller connecting the plurality of base stations with a communication network;
- and
- a content server connected to the communication network,
- wherein the plurality of base stations transmit same communication information to an access terminal at a same timing and the access terminal combines the communication information received from the plurality of base stations at the same timing,
- wherein each of the base stations includes a plurality of sectors,
- wherein a group of the sectors which transmit the same communication information at the same timing is determined and a group number is defined to identify the group,
- wherein each of the base stations includes a sector state managing table for storing a sector number for identifying a corresponding sector and the group number for identifying the group of the sectors which transmit the same communication information at the same timing,
- wherein, when a first base station receives a viewing request from an access terminal, the first base station establishes a path to the communication controller, obtains the communication information from the content server via the communication controller to start transmission of the communication information to the access terminal, and transmits a communication information transmission request to an adjacent base station by referring to the sector state managing table, the communication information transmission request including at least an ID of the communication information, an ID of the own sector, and the group number, and
- wherein for each adjacent sector, the adjacent base station containing the each adjacent sector receives the communication information transmission request, refers to the sector state managing table, if the group number to which the sector belongs is equal to the group number included in the communication information transmission request, the adjacent base station establishes a path to the communication controller, and
- obtains the communication information from the content server via the communication controller to start transmission of the communication information to the access terminal.
8 more elements
A radio communication system including:
- a plurality of base stations;
- a communication controller connecting the plurality of base stations with a communication network;
- and
- a content server connected to the communication network,
- wherein the plurality of base stations transmit same communication information to an access terminal at a same timing and the access terminal combines the communication information received from the plurality of base stations at the same timing,
- wherein each of the base station includes a plurality of sectors,
- wherein each of the base stations includes a table, which stores the sector number for identifying the correspondent sector and the parameter for identifying the group of the sectors which transmit the same communication information at the same timing, the parameter being a standard based on which whether a communication information transmission request is transmitted to the associated sector is determined,
- wherein each access terminal includes means for obtaining a positional information of own access terminal,
- wherein, during transmission of the communication information from a first base station to the access terminal, if the first base station receives an addition request of the communication information from the access terminal, the addition request including at least an ID of the sector selected by the access terminal based on the positional information of own access terminal, positional information of a second base station and the parameter, the first base station transmits the communication information transmission request to the sector whose ID is included in the addition request, the communication information transmission request including at least an ID of the communication information and an ID of the own sector, and
- wherein the second base station including the sector which receives the communication information transmission request establishes a path to the communication controller, and obtains the communication information from the content server via the communication controller to start transmission of the communication information to the access terminal.
7 more elements
A radio communication system including:
- a plurality of base stations;
- a communication controller connecting the plurality of base stations with a communication network;
- and calculation results with the parameter, if the calculation result is smaller than the parameter, establishes a path to the communication controller, obtains the communication information from the content server via the communication controller to start transmission of the communication information to the access terminal.
A radio communication system including:
- a plurality of base stations;
- a communication controller connecting the plurality of base stations with a communication network;
- and
- a content server connected to the communication network,
- wherein the plurality of base stations transmit same communication information to access an access terminal at a same timing and the access terminal combines the communication information received from the plurality of base stations at the same timing,
- wherein each of the base stations includes a plurality of sectors, and
- wherein the access terminal measures powers received from the plurality of base stations, determines n sectors (n is a positive integer) having the power higher than a predetermined power threshold by comparing the measured powers with the predetermined power threshold, and sends viewing request including information of the n sectors to a first base station,
- the first base station, in response to received of the viewing request, collects the information on the sectors included in the viewing request, determines the sectors, and sends the transmission request including at least an ID of the communication information to the determined sectors, and
- a second base station, including the sector which receives the transmission request, establishes a path to the communication controller and obtains the communication information from the content server via the communication controller to start transmission of the communication information to the access terminal.
6 more elements
Dependencies are inferred from the claim text.