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Method for triggering relay computed HARQ downlink data feedback time delay

A technology of downlink data and feedback delay, applied in digital transmission system, using return channel for error prevention/detection, error prevention, etc.

Inactive Publication Date: 2009-05-06
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the prior art, once a problem occurs during HARQ burst or tunnel data transmission, the RS may not know when to start calculating the time to forward the corresponding feedback

Method used

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  • Method for triggering relay computed HARQ downlink data feedback time delay
  • Method for triggering relay computed HARQ downlink data feedback time delay
  • Method for triggering relay computed HARQ downlink data feedback time delay

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Example 1 as image 3 Shown is HARQ without tunneling. After RS1 and RS2 receive the empty burst, they respectively start to calculate the feedback delay according to the formula (1) at the moment of receiving the empty burst.

[0064] The empty burst can be implemented by (but not limited to) modifying the burst information element (IE) format in the MAP message in the existing IEEE802.16j standard draft. There are two ways to realize that the empty burst air interface resource is zero.

[0065] One is to define a null burst mode and corresponding null burst IE. Such as Figure 7 As shown, a dummy burst mode (0b0111=dummyHARQ burst) can be defined by using reserved words in the RS HARQ downlink MAP IE. Correspondingly, such as Figure 8 As shown, an empty burst information element may be defined to include corresponding CID information and ACID information. Once the RS finds that the burst is an empty burst from the RS HARQ DL MAP IE, it will start to calculate t...

Embodiment 2

[0067] Example 2 as Figure 4 Shown is the retransmission feedback of the tunnel link in the tunnel HARQ. After RS1, RS2 and RS3 receive the empty tunnel data, they respectively start to calculate the feedback delay according to the formula (2) at the moment of receiving the empty tunnel data. Regardless of whether the retransmission data corresponding to the empty tunnel data is a tunnel packet or a tunnel burst, the calculation method is the same, according to formula (2).

[0068] The empty tunnel data can be implemented by (but not limited to) modifying the burst information element (IE) format in the MAP message in the existing IEEE802.16j standard draft. There are two ways to realize that the empty burst air interface resource is zero.

[0069] One is to define a null burst mode and corresponding null burst IE. Such as Figure 7 As shown, a dummy burst mode (0b0111=dummy HARQ burst) can be defined by using reserved words in the RS HARQ DL MAP IE. Correspondingly, su...

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Abstract

The invention relates to a method for triggering the feedback and the time delay of relay calculation HARQ downlink data in a multi-hop relay network, which is as follows: defining null data which does not occupy the data of null resources; and immediately calculating and repeating the time delay of corresponding data feedback while receiving the relay of the null data. The method utilizes the null data to actively trigger the relay calculation, and avoids evil consequences caused by that the relay does not know when to begin to calculate and repeat the corresponding feedback under the circumference of generating problems in the process of HARO sudden or channel data transmission.

Description

technical field [0001] The invention relates to a hybrid automatic retransmission request HARQ, in particular to a method for triggering a relay in a multi-hop relay network to calculate the feedback delay time of HARQ downlink data. Background technique [0002] At present, based on the air interface protocol IEEE802.16j (Institute of Electrical and Electronics Engineers 802.16 relay) IEEE 802.16e of the broadband wireless access system, a relay station, referred to as RS, is introduced. [0003] Such as figure 1 As shown, one or more RSs are set between a base station (MR-BS, Multi-hop Relay Base Station) supporting multi-hop relay and a terminal (MS, Mobile Stations). By relaying bursts between MR-BS and MS, RS can expand system coverage and increase system capacity. For relay station RS, according to whether to generate and send prefix and control messages, RS can be divided into transparent RS and non-transparent RS; according to whether to generate bitmap MAP message...

Claims

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Application Information

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IPC IPC(8): H04L1/18H04L1/00
Inventor 刘扬江辉
Owner ZTE CORP
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