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In-frame acknowledgments and retransmissions

一种码元、信道的技术，应用在帧内确认和重传领域，能够解决性能降级、确认超时介质争用增加延迟等问题

Active Publication Date: 2015-04-29
MICROSOFT TECH LICENSING LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a typical IEEE 802.11g implementation, the header overhead can add up to 52µs of latency
Additionally, acknowledgment timeouts (the amount of time the receiver waits for a frame acknowledgment from the sender before retransmitting the frame), medium contention, and frame retransmissions all add to the delay
As a result, the application suffers performance degradation

Method used

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  • In-frame acknowledgments and retransmissions
  • In-frame acknowledgments and retransmissions
  • In-frame acknowledgments and retransmissions

Examples

Experimental program
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Embodiment Construction

[0009] overview

[0010] As discussed above, frame retransmission in conventional wireless systems is inefficient. Embodiments of the present invention improve efficiency by utilizing intra-frame retransmission of erroneous portions of a transmission frame, such as, for example, erroneous symbols. A feedback channel is used by the sender to transmit an acknowledgment (ACK) of one or more portions of the transmitted frame. The receiver monitors the feedback channel and retransmits any negatively acknowledged portions within the same frame rather than within a new retransmission frame. Retransmitting the erroneous portion within the same frame that was originally transmitted improves efficiency. Because the erroneous part is retransmitted within the same frame, there is no need for the transmitter to re-contention the medium, and there is no need for the transmitter to retransmit the complete preamble and header. Instead, during transmission of the frame, the sender inserts a...

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PUM

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Abstract

Implementations for retransmitting erroneous portions within a transmission frame are described. A sender transmits a transmission frame and the receiver performs error detection on portions of the transmission frame in order to determine if any are received in error. The receiver sets up a feedback channel and transmits acknowledgements to the receiver to indicate that one or more portions have been received and to identify any portions that are received with errors. At least some of the acknowledgements are transmitted prior to receipt of the entire transmission frame. The sender retransmits any portions that are identified as being erroneous within the transmission frame.

Description

Background technique [0001] In traditional wireless networks, unrecoverable symbol errors lead to frame retransmissions. Frame retransmissions reduce the efficiency of data communication systems due to media contention overhead, retransmission of packet headers and preambles, and retransmission of portions of data that were correctly received. In a typical IEEE 802.11g implementation, the header overhead can add up to a delay of 52 μs. In addition, acknowledgment timeouts (the time the receiver waits for a frame acknowledgment from the sender before retransmitting the frame), medium contention, and frame retransmissions all add to delay. As a result, the application suffers from performance degradation. There have been some inefficient attempts to address frame retransmissions, in particular by retransmitting erroneous bits only in retransmitted frames. Contents of the invention [0002] This Summary is provided to introduce a simplified concept of the disclosure that is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04W74/08
CPCH04L1/1854H04L1/1887H04L1/1893
Inventor J·张K·谭Y·张R·钱德拉
Owner MICROSOFT TECH LICENSING LLC