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Radio base station, relay apparatus and radio communication method

A technology of wireless base station and relay device, which is applied in wireless communication, radio transmission system, transmission modification based on link quality, etc., and can solve problems such as throughput decline and interference of wireless communication system

Inactive Publication Date: 2011-06-08
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in a wireless communication system that performs relay transmission as described above, there is a problem that a signal transmitted and received between a wireless base station and one relay device becomes transmitted between the wireless base station and another relay device or another wireless communication terminal. The interference signal of the transmitted and received signals, thus reducing the overall throughput of the wireless communication system

Method used

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  • Radio base station, relay apparatus and radio communication method
  • Radio base station, relay apparatus and radio communication method
  • Radio base station, relay apparatus and radio communication method

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no. 1 Embodiment approach

[0029] (Overall schematic configuration of wireless communication system)

[0030] figure 1 It is a schematic diagram of the wireless communication system according to the first embodiment. like figure 1 As shown, the radio communication system includes a radio base station 10, a non-reproducing type (Amplify-and-Forward (AF) type) relay device 20 arranged in a cell C1 of the radio base station 10, and radio communication terminals 30-1 to 30 -5 composition. Hereinafter, when the wireless communication terminals 30 - 1 to 30 - 5 are not distinguished, they are referred to as the wireless communication terminal 30 . In addition, the radio base station 10, the relay apparatus 20, and the radio communication terminal 30 included in the radio communication system are not limited to figure 1 quantity or manner shown.

[0031] The radio base station 10 determines any one of the direct mode, the relay mode, and the composite mode combining the direct mode and the relay mode for ...

no. 2 Embodiment approach

[0088] In the first embodiment, the case where the radio base station 10 communicates with one or a plurality of radio communication terminals 30 via one relay device 20 in the relay mode has been described. In the second embodiment, a case where the radio base station 10 communicates with a plurality of radio communication terminals 30 via different relay apparatuses 20 in a relay mode will be described focusing on the differences from the first embodiment.

[0089] Figure 10 It is a schematic diagram of the wireless communication system according to the second embodiment. In the wireless communication system of the second embodiment, as Figure 10 As shown, a plurality of relay apparatuses 20-1 to 20-3 are arranged in a cell (not shown) of the radio base station 10, and the radio communication terminals 30-1 to 30-3 are respectively located in the plurality of relay apparatuses 20-1 to the cells C21 to C23 of 20-3.

[0090] exist Figure 10 In the illustrated wireless c...

no. 3 Embodiment approach

[0097] In the third embodiment, a radio communication system in which a plurality of radio base stations 10 forming a cell in which the relay apparatus 20 is arranged is adjacent to each other will be described focusing on the differences from the above-described embodiments.

[0098] Figure 11 It is a schematic diagram of the wireless communication system according to the third embodiment of the present invention. In the wireless communication system of the third embodiment, as Figure 11 As shown, a plurality of relay apparatuses 20-1 to 20-3 are arranged in a cell (not shown) of the radio base station 10-1, and the radio communication terminals 30-1 to 30-3 are located in the plurality of relay apparatuses 20, respectively. -1 to 20-3 in cells C21 to C23. Similarly, in a cell (not shown) of the radio base station 10-2 adjacent to the radio base station 10-1, a plurality of relay apparatuses 20-4 to 20-6 and radio communication terminals 30-4 to 30- 6 are located in the ...

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Abstract

The present invention provides a radio base station, a relay apparatus and a radio communication method. The radio base station 10 determines a communication mode for each radio communication terminal 30 from among a direct mode for communicating without via a relay apparatus 20, a relay mode for communicating via the relay apparatus 20 by using a directional beam transmitted between the radio base station 10 and the relay apparatus 20, and a combined mode for communicating by combining the direct mode and the relay mode based on the reception power information acquired from each radio communication terminal 30, and communicates with the each radio communication terminal 30 by using the communication mode determined for the each radio communication terminal 30.

Description

technical field [0001] The present invention relates to a radio base station forming a cell in which at least one relay device is arranged, a relay device arranged in the cell, and a radio communication method in a radio communication system including the radio base station and the relay device. The present application is based on and claims priority from a prior Japanese Patent Application No. 2009-275760 filed on December 3, 2009, the entire contents of which are hereby incorporated by reference. Background technique [0002] In recent years, a wireless communication system in which an Amplify-and-Forward (AF: Amplify-and-Forward) type relay device is installed in a cell of a base station has attracted attention (for example, Haruyo Machida, Kenichi Higuchi, "Serura Communication Amplify-and-Forward" and-Forward type リレ一伝 Sending method no one 検 discuss", Institute of Electronic Information and Communication Combined with the conference speech collection 2008 Communicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/26H04W88/04
CPCH04L1/0001H04B7/2606H04B7/15592H04W16/26H04L2001/0097
Inventor 藤井启正沈纪恽大矢智之
Owner NTT DOCOMO INC