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Speed rate adaption in wireless communication system

A rate and data rate technology, applied in the field of wireless communication systems, which can solve the problems of insufficient utilization of channel resources, high frame error rate, and reduced transmission quality.

Inactive Publication Date: 2002-07-03
LUCENT TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] This prior art protocol disadvantageously utilizes the data rate of the initial transmission in the retransmission even though the channel state of the associated receiver may have changed
Specifically, if the channel state degrades between the time of initial transmission and the time of retransmission, the retransmission is likely to suffer from a higher frame error rate (FER) than the initial transmission, resulting in the degradation of transmission quality
Or, if channel conditions are improved, channel resources are not fully utilized due to higher data rates utilized in retransmissions

Method used

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  • Speed rate adaption in wireless communication system
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Embodiment Construction

[0014] The invention is a data rate adaptation method based on channel state. figure 1 is a flowchart 100 illustrating a data rate adaptation method according to an embodiment of the present invention. In step 110, the base station or the transmitting device receives a rate indication message from a plurality of receivers to implement data transmission, wherein the rate indication message may be the channel state measurement result in the receiver or the data calculated based on the channel state measurement result in the receiver rate. In step 115, the base station selects a receiver for transmitting data, wherein the selected receiver is preferably the receiver associated with the highest data rate. In step 120, the base station transmits the data subpacket to the selected receiver at the data rate indicated in the associated rate indication message.

[0015] In another embodiment, the subpackets transmitted in step 120 may be transmitted at a higher data rate than indicat...

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Abstract

Disclosed is a method of data rate adaptation based on channel conditions. Data is initially transmitted at a first data rate based on a measured first channel condition and subsequently re-transmitted at a second data rate based on a measured second channel condition, wherein the first channel condition is measured prior in time to the second channel condition.

Description

[0001] Cross Reference Related Applications [0002] Related subject matter is disclosed in the following concurrently filed application: US Patent Application, titled "Sub-Packet Adaptation In A Wireless Communication System," Serial No. 09 / 725393. technical field [0003] The present invention relates generally to wireless communication systems, and more particularly to data transmission over wireless communication systems. Background technique [0004] In the well-known third-generation CDMA-data-only evolution-based wireless communication system, hereinafter referred to as 3G-1 x EVDO, a separate frequency carrier is used to provide voice and data services. That is, voice and data signals are transmitted over separate forward links on different frequency carriers. Data is transmitted over a time-multiplexed frequency carrier at a fixed data transmit power but variable data rate. Specifically, the SIR measured by the pilot signal transmitted by the base station in the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04L1/00H04L1/08H04L1/16H04L1/18H04L12/20
CPCH04L1/0066H04L1/0002H04L1/16H04L2001/0093H04L1/0025H04L1/0006H04L1/0009H04L1/0068H04L1/0016H04L1/08H04L1/1812H04L12/16
Inventor 阿那布·达斯法鲁克·厄拉·克汗桑基夫·南达
Owner LUCENT TECH INC