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Communication system, its base station, and communication method

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

[0052] Hereinafter, embodiments of the communication system of the present invention will be described in detail with reference to the drawings.

[0053] 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.

[0054] This communication system is an OFDMA-based communication system in which communication is performed between a base station (CS: cell station) and a plurality of terminals (PS: personal stations) in a frame composed of a plurality of subchannels for each frequency band.

[0055] 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.

[0056] 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 temporarily decreased and then increased while communication by a user terminal is in progress, it is possible to continue the communication without lowering the communication throughput of the user terminal and provide a throughput corresponding to QoS to the user terminal. The communication system of theOFDMA method which performs data communication by using one or more sub channels between a base station (1) and a plurality of terminals includes: communication data acquisition means which acquires a communication data amount; and channel allocation means which allocates the sub channel(s) in accordance with the communication data amount. When the communication data amount has decreased, the channel allocation means maintains allocation of at least one of the sub channels which have been allocated.

Description

technical field [0001] The present invention relates to an OFDMA communication system, 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 to ...

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