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Radio base station, relay station, and communication control method

A technology for wireless base stations and relay stations, applied in the fields of relay stations, communication control, and wireless base stations, can solve the problems of incomplete uplink burst allocation, and achieve the effect of improving utilization efficiency

Inactive Publication Date: 2009-09-02
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Figure 28A and Figure 28B As shown, unlike the case of the downlink burst allocation indicated by the square formed by the number of subchannels and the number of symbols, the allocation of the uplink burst is not very complete

Method used

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  • Radio base station, relay station, and communication control method
  • Radio base station, relay station, and communication control method
  • Radio base station, relay station, and communication control method

Examples

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no. 1 example

[0070] First, the first embodiment will be described.

[0071] The first embodiment is an example for appropriately allocating wireless resources at the time of wireless communication between the wireless base station BS and the wireless terminal MS via the relay station RS.

[0072] Figure 1A An example of a subframe in the downlink direction is described (the abscissa is time (transmission timing), and the ordinate is channel).

[0073] Such as Figure 1A As shown, radio resources are allocated to relay stations RS#1 and RS#2 so as to utilize half of the frequency band for simultaneous transmission. Wireless resources are also allocated to wireless terminals MS#1 and MS#2 so as to utilize half of the frequency band for simultaneous transmission. For the allocation, the DL-MAP messages are set such that the transmission regions (channel and time) do not overlap between bursts.

[0074] By allocating radio resources in this way, data is simultaneously transmitted from the...

no. 2 example

[0077] A second embodiment will now be described.

[0078] In the first embodiment, radio resources are allocated to the relay station RS and the subordinate radio terminal MS so that the corresponding transmission areas (frequency channels, transmission timing) do not overlap. However, even if there are a plurality of relay stations RS under the radio base station BS and the respective relay stations RS are deployed at positions where mutual interference does not occur (for example, such that the coverage areas of the respective relay stations (areas that provide radio communication services to radio terminals) do not overlap) different wireless resources are also allocated respectively.

[0079] Therefore, according to the second embodiment, the radio base station BS manages the relay stations RS that do not interfere with each other, and just allocates downlink bursts (radio resource allocation in the downlink direction) to the radio terminals MS under such relay stations R...

no. 3 example

[0131] A third embodiment will now be described.

[0132] In this embodiment, consider the following example. Figure 8 An example of distribution of wireless terminals MS is described. Such as Figure 8 As shown, the wireless terminals MS#1, MS#2 and MS#3 are located at the cell edge of the relay station RS. Assume that relay stations RS#1 and RS#2 and these wireless terminals MS#1, MS#2 and MS#3 communicate according to QPSK. It is also assumed that the wireless terminal MS#4 located near the relay station RS#2 communicates according to 16QAM, whereby fast communication is possible. It is assumed that each relay station RS transmits the same amount of data to each wireless terminal MS. In this case, the data destined for the wireless terminal MS#4 can be transmitted using wireless resources that are half the wireless resources (the number of subchannels) of the other wireless terminal MS. The relay stations RS#1 and RS#2 do not interfere with each other.

[0133] Fig...

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Abstract

A radio base station which performs data transmission with radio terminals under a plurality of relay stations via the plurality of relay stations respectively, including a control unit which transmits a first data addressed to a first radio terminal under a first relay station and a second data addressed to a second ratio terminal under a second relay station, in at least partially timing.

Description

technical field [0001] The present invention relates to a wireless base station, a relay station, and a communication control method using wireless communication, and more particularly, to a wireless base station, a relay station, and a communication control method with improved utilization efficiency of frequencies to be used. Background technique [0002] Two types are specified in IEEE 802.16 WG known as an example of a wireless communication system standard: IEEE 802.16d deals with fixed communication (see, for example, Non-Patent Document 1 below), and IEEE 802.16e deals with mobile communication (see, for example, Non-Patent Document 2). [0003] Figure 22 A diagram depicting the services provided by IEEE 802.16d and IEEE 802.16e. These services are based on a P-MP (Point-to-Multipoint) connection in which a plurality of terminals 101 to 103 are connected to one wireless base station 100 . [0004] In this way, IEEE 802.16d and the like are based on a P-MP connectio...

Claims

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Application Information

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IPC IPC(8): H04W16/26H04W72/04H04W76/02H04W88/08
CPCH04W24/02H04B7/2606H04W84/047H04W16/26H04B7/155H04W72/0453
Inventor 奥田将人
Owner FUJITSU LTD
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