Method of repeat transmission of messages in a centrally controlled communication network

Inactive Publication Date: 2006-01-03
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]It is an object of the present invention to provide an improved method for

Problems solved by technology

Repeat requests are of great importance, especially in radio networks, since error-free transmission of data with conventional methods (FEC) cannot be guaranteed because of physically limiting high error rates.
In speech transmission a transmission error genera

Method used

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  • Method of repeat transmission of messages in a centrally controlled communication network
  • Method of repeat transmission of messages in a centrally controlled communication network

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Embodiment Construction

[0023]The method according to the invention for repeat transmission of messages is performed by the centrally controlled communication network, especially a HIPERLAN Type 2 communication system, illustrated in FIG. 1. The method according to the invention can of course also be applied to processes with other signaling.

[0024]In HIPEALAN Type 2 communication Systems a terminal T1, T2, . . . is assigned a temporary address, as long as it is connected with the central station, i.e. is announced as a network participant. The temporary address (MAC-ID) is used during communication in order to address a terminal definitely within a cell. One or more predetermined addresses is or are provided for broadcast and multi-cast transmissions. The central station ZE transmits broadcast and multi-cast messages with the predetermined address or addresses as target or targets. All terminals In a cell, or all which belong to a multi-cast group, receive these messages. As in point-to-point links the messag

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Abstract

In a method for repeat transmission of messages in a centrally controlled communication network including a plurality of terminals and a central station messages assigned sequence numbers are broadcast or multicast from the central station for reception by terminals of a participating group. As soon as a terminal detects loss of a transmitted message or an error in the transmitted message, it transmits a repeat request for repeat transmission of that message, which includes the sequence number of the lost or erroneous message, over another communication link, especially a point-to-point communication link. The central station repeats the message transmission of the lost or erroneous message but only until a predetermined maximum number of repetitions occurs within a predetermined time interval or until a positive acknowledgement of receipt of the previously lost or erroneous message is received.

Description

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Claims

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Application Information

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Owner ROBERT BOSCH GMBH
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