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Packet transceiver apparatus

A technology of receiving equipment and equipment, which is applied in the direction of code division multiplexing system, communication between multiple stations, network traffic/resource management, etc., can solve the problems of decreased transmission efficiency and inability to realize retransmission signal combination, etc. To achieve the effect of preventing packet reception failure

Inactive Publication Date: 2005-02-09
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to a decrease in transmission efficiency
[0039] Therefore, when the modulation parameters are changed and transmitted according to the propagation path conditions at the time of retransmission, if the modulation parameters at the time of the initial transmission and the modulation parameters at the time of retransmission are not the same, the retransmission signal cannot be combined on the side of the receiving station

Method used

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Embodiment Construction

[0077] (A) Overall operation of the present invention

[0078] FIG. 1 is a block diagram of retransmission control performed by a transmitting station according to propagation path conditions according to the present invention. The dotted line in Fig. 1 represents the data signal flow, and the solid line represents the control signal flow. Transmission data DT generated by each mobile station (data actually transmitted through the network) is accumulated in the signal buffer SBF in the transmission data controller 11a for a period of time. The implementation of signal buffering includes storing retransmission data and new data separately from each other, storing these data items together, and storing these data items separately or together according to the service type. FIG. 2 is a diagram describing transmission data in the signal buffer SBF. The buffer stores the modulation parameters (for example, the type of data modulation scheme, ie QPSK, 16-QAM, . . . ) and the packet...

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Abstract

Disclosed is a packet receiving apparatus in a communication system for transmitting a packet signal upon changing over a parameter of a transmit signal in accordance with conditions of a propagation path, and, when the packet signal cannot be received correctly on a receiving side, retransmitting the packet signal, combining the packet data received previously and the retransmitted packet data and executing decode processing based upon the combined packet data. The receiving apparatus is such that if the propagation path conditions at the time of retransmission are inferior, part of the packet data extracted from a buffer is cut out and combined with a retransmission packet and decode processing is executed based upon the result of combining. If the propagation path conditions at the time of retransmission are superior, data of a plurality of packets to undergo retransmission combining is extracted from the buffer, the extracted data is combined with part of a retransmission packet and decode processing is executed based upon the result of combining.

Description

technical field [0001] The present invention relates to a packet transmitting and receiving device in a communication system, in particular to a packet transmitting and receiving device for efficiently transmitting a packet according to the condition of a propagation path in a mobile communication system for transmitting a packet. Background technique [0002] Demand for Internet services using mobile communication systems is increasing. The packet transmission scheme is suitable as a method for efficient transmission of signals having different qualities and transmission rates. In particular, it is desirable to efficiently transmit large amounts of data on the downlink from the base station to each mobile station. Packet transmission is characterized in that the signal is sent only when user data is generated, and multiple users can share the channel. Efficient utilization of radio resources can thus be achieved. There are also adaptive modulation, scheduling and retrans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/16H04B7/26H04J13/00H04L1/00H04L1/18H04L12/70H04L29/08H04W28/04
CPCH04L1/1819H04L1/1887H04L1/0069H04L1/005H04L1/0003H04L1/1845H04L27/3488
Inventor 田中良纪关宏之武尾幸次
Owner FUJITSU LTD