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Communication system, its base station, and communication method

A technology of communication system and base station, which is applied in the field of base station and communication, and can solve problems such as communication throughput

Inactive Publication Date: 2009-08-26
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] In the above cases, the communication throughput corresponding to QoS will not be provided to the user's terminal

Method used

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  • Communication system, its base station, and communication method
  • Communication system, its base station, and communication method
  • Communication system, its base station, and communication method

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0054] Hereinafter, embodiments of the communication system of the present invention will be described in detail with reference to the drawings.

[0055] figure 1 It is an explanatory diagram showing the frame configuration of OFDMA used in the communication method according to the embodiment of the present invention.

[0056] The present communication system is an OFDMA communication system in which communication is performed between a base station (CS: cell station) and a plurality of terminals (PS: personal station) in a frame composed of a plurality of subchannels for each frequency band.

[0057] figure 1 The frame configuration of is, for example, the configuration when four slots (S1 to S4) are used in the PHS system, the vertical axis is the frequency axis, and the horizontal axis is the time axis.

[0058] figure 1 In , both the downlink period and the uplink period are divided into 28 frequency bands on the frequency axis. The subchannels in the first frequenc...

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PUM

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Abstract

In a communication system of the OFDMA communication method, even when transmission data is decreased temporarily and then increased again while communication by a user terminal is in progress, the communication can be continued without lowering the communication throughput of the user terminal and the throughput corresponding to QoS can be provided to the user terminal. The OFDMA communication system for performing data communication using one or more subchannels between a base station (1) and a plurality of terminals includes a communication data amount acquisition unit that acquires a communication data amount and a channel allocation unit that allocates the subchannels according to the communication data amount. When the communication data amount has decreased, the channel allocation unit maintains allocation of at least one of the allocated subchannels.

Description

technical field [0001] The present invention relates to an OFDMA communication system, its base station and communication method. Background technique [0002] As a wireless access method such as a digital mobile phone system or a PHS system, a TDMA / TDD method combining TDMA (Time Division Multiple Access) and TDD (Time Division Duplex) is used. Furthermore, in addition to this, an OFDMA scheme utilizing OFDMA (Orthogonal Frequency Division Multiplexing Access) is proposed. [0003] OFDM is a method in which the carrier of modulated data is divided into a plurality of 'subcarriers' (subcarriers) that are orthogonal to each other, and the data signal is distributed to each subcarrier and transmitted. [0004] Next, the outline of the OFDM method will be described. [0005] Figure 7 It is a block diagram showing the configuration of an OFDM modulation device used on the transmission side. Transmission data is input to the OFDM modulator. This transmission data is supplied...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04W72/10H04W76/04
CPCH04L5/0007H04W72/10H04W72/04H04L5/0048H04W72/087H04L5/1484H04W76/04H04W76/20H04W72/543H04W72/56H04W72/0453
Inventor 谷川弘展中村泰浩高松信昭
Owner KYOCERA CORP