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Wireless communication device and wireless communication method

a wireless communication and wireless communication technology, applied in multiplex communication, signalling characterisation, channel coding adaptation, etc., can solve the problems of frame upsizing, error rate characteristic deterioration in the cell edge, and increase the overhead of the transmission frame, so as to improve the throughput without increasing the overhead of the wireless fram

Inactive Publication Date: 2007-09-20
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] It is an object of the present invention to provide a wireless communication device and a wireless communication method that improve a throughput without increasing the overhead of the wireless frame.

Problems solved by technology

Generally, an error rate characteristic deteriorates in the cell edge, because the received power from the base station covering the cell is attenuated, and the mobile station is susceptible to interference by the signals from the base stations located in other cells in the periphery.
This method, however, causes the transmission frame to be upsized and leads to an increase of an overhead of the transmission frame.
Further, even when fixing a transmission frame length, it follows that a substantial data transmission quantity decreases.
In the conventional arts described above, however, though capable of improving the decrease in the throughput with respect to a data channel for transmitting to the mobile station located at the cell edge, a problem about the transmission of a control channel still remains.
Namely, in the mobile station located at the cell edge, the data channel uses the coding having the larger redundancy than the control channel has, and therefore such a phenomenon might occur that the error rate characteristic of the control channel becomes lower than the error rate characteristic of the data channel at the cell edge.
Accordingly, in the conventional arts, it follows that the retransmission is repeated if the error frequently occurs in the control channel and that a decrease in transmission efficiency of the whole system is brought about.
In this method, however, the control channel generally uses a format common to all the mobile stations, and therefore, when increasing the redundancy for the control channel and upsizing the control channel, it follows that the whole transmission frame gets excessively upsized.
Further, even when fixing the transmission frame length, it follows that the substantial transmission quantity decreases due to the increase in the overhead of the control channel.
Hence, this type of method results in increasing the overhead of the transmission frame.

Method used

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  • Wireless communication device and wireless communication method
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  • Wireless communication device and wireless communication method

Examples

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first embodiment

[0056] A wireless communication system in a first embodiment of the present invention will hereinafter be described with reference to the drawings. Configurations in the following embodiments are exemplifications, and the present invention is not limited to the configurations in the embodiments.

[0057] [System Architecture]

[0058] The wireless communication system in the first embodiment shall be, as shown in FIG. 15, configured by a base station device (which will hereinafter simply be termed a base station) 500, and a mobile station devices (which will hereinafter be simply termed mobile stations) 501 and 502. The configuration illustrated in FIG. 15 is nothing more than one example adopted for the sake of explanatory convenience, wherein a plurality of base stations and a plurality of mobile stations may exist, and an unillustrated control device etc may further be provided. Hereinafter, as shown in FIG. 15, the explanation will be made along with such a case example that the base...

second embodiment

[0115] The wireless communication system according to a second embodiment of the present invention will hereinafter be described. The wireless communication system according to the first embodiment discussed above uses the frame format corresponding to the example shown in FIG. 1 as discussed in the item of Outline of Embodiments of the Invention, i.e., the frame format having the structure in which the control information part 2 is dually allocated to the control channel (CCH) and to the data channel (DCH). The wireless communication system in the second embodiment uses the frame format corresponding to the example illustrated in FIG. 2 discussed in the item of Outline of Embodiments of the Invention. The description shall be focused on different functional units from those in the first embodiment with respect to the base station 500 and the mobile stations 501, 502 that configure the wireless communication system in the second embodiment. A configuration in the second embodiment i...

operational example

[0135] Operations of the base station 500 and the mobile stations 501, 502 in the second embodiment will hereinafter be described. To begin with, the transmitting operation of the base station 500 in the second embodiment will be explained with reference to FIG. 11.

[0136] The base station 500, when transmitting the data to the mobile station 501, transmits the data without conducting the in-band of the control information part 2. This is because the data structuring unit 105 determines not to allocate the control information part 2 to the data channel, since the coding rate of the data channel regarding the transmitted wireless frame that is determined by the rate determining unit 123 does not get lower than the fixed-in-system coding rate of the control channel. In this case, the information showing the [absence] is set in the presence / absence information field in the in-band information generated by the header generation unit 171.

[0137] On the other hand, the base station 500, o...

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PUM

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Abstract

The present invention relates to a wireless communication device and a wireless communication method that improve a throughput without increasing an overhead of a wireless frame. The wireless communication device performing communications by using a wireless frame containing a control channel and a data channel, for improving the throughput without increasing the overhead of the wireless frame, comprises a structuring unit allocating, as second control information, part of control information used for communication control to the data channel with respect to a transmitted wireless frame to be transmitted to one other wireless communication device.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a wireless communication device and a wireless communication method that perform communications by use of a wireless frame containing a control channel and a data channel. [0003] 2. Description of the Related Art [0004] In a cellular mobile communication system, cells as communication areas covered by respective base stations are located so as to be neighboring to each other or partially overlapped with each other. Each base station connects each mobile station to the mobile communication system by performing wireless communications with a plurality of mobile stations located within each corresponding cell. In this type of cellular mobile communication system, an important subject is to improve a throughput in the mobile station located at the cell edge. Generally, an error rate characteristic deteriorates in the cell edge, because the received power from the base station covering th...

Claims

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Application Information

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IPC IPC(8): H04J3/24H04W16/02H04W24/10H04W72/04H04W72/08H04W72/12
CPCH04L1/0003H04L1/0009H04L1/0028H04W24/02H04L1/0038H04L1/0079H04L1/0088H04L1/0031H04B1/76H04B7/005H04L65/00
Inventor SHIIZAKI, KOTAROSEKI, HIROYUKISUDA, KENJIJITSUKAWA, DAISUKE
Owner FUJITSU LTD