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ARQ protocol with packet-based reliability level setting

A reliability and protocol technology, applied in transmission modification based on link quality, error prevention/detection using return channel, digital transmission system, etc., can solve problems such as PDU transmission blocking and throughput reduction, and achieve overall service quality Improved effect

Inactive Publication Date: 2007-05-30
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But if all the PDUs in the sending window have been sent, as long as the oldest PDU is not acknowledged, the further transmission of PDUs will be completely blocked, that is, the sending window is stopped because the sending window cannot be moved to the left
Therefore, the delay described above caused by L2_ARQ retransmissions approximately equal to the round-trip transmission time will stall the send window and result in reduced throughput

Method used

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  • ARQ protocol with packet-based reliability level setting
  • ARQ protocol with packet-based reliability level setting
  • ARQ protocol with packet-based reliability level setting

Examples

Experimental program
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Embodiment Construction

[0050] FIG. 1 shows a related embodiment of the present invention, wherein the defined data structure containing L2_ARQPDU is a related data unit of the L3 protocol. Now let's explain this graph.

[0051] A flowchart is given on the left side of the figure, while the upper right part of the figure contains representations to allow steps S1 and S2 to be better understood.

[0052] According to this embodiment, it is assumed that one communication device implements first and second communication protocols, such as the aforementioned protocols L1 and L2_ARQ, respectively. The first protocol provides rules governing the transmission of data units of the second protocol over a given physical connection, and the first protocol provides at least two different reliability levels for the transmission of data units of the second protocol. Moreover, the second protocol provides rules for segmenting data units of the third protocol (such as the above-mentioned L2_frame or L3) into data u...

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PUM

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Abstract

A communication device and method is provided, for which, when having implementations of first protocol that specifies different reliability levels for sending PDUs of a second protocol, where the second protocol specifies segmentation of PDUs of a third, higher layer protocol, a capability is introduced for setting the reliability level of second protocol (L2_ARQ) PDUs differently for second protocol PDUs belonging to a defined data structure containing such second protocol (L2_ARQ) data units. The defined data structure can be a higher layer protocol data unit or the send window. Thereby the delay caused by retransmission of second protocol data units can be reduced significantly.

Description

technical field [0001] The present invention relates to a communication device and method for communication based on data units, wherein at least one implementation of a first and a second communication protocol is used, PDUs (Protocol Data Units) of a third, higher layer protocol are segmented into first 2. PDUs of the lower layer protocols, and these lower layer PDUs are sent through a physical connection according to the first protocol, the first protocol provides an adjustable reliability level for the lower layer PDUs. Background technique [0002] As is well known in the field of communications, a protocol is a set of rules by which two points can exchange data units in a defined manner. Two implementations of a protocol at two points exchanging data units are also referred to as peers. For the purposes of this description, the term data unit or protocol data unit (PDU) refers to a defined data carrier specified by a particular protocol. It should be noted that for d...

Claims

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Application Information

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IPC IPC(8): H04L1/18H04L1/00H04L1/16H04L29/06
CPCH04L1/1874H04L1/007H04L1/1614H04L1/1635H04L1/0006H04L1/0009H04L1/187
Inventor B·拉通伊F·坎R·鲁德维格
Owner TELEFON AB LM ERICSSON (PUBL)