CN101383684B - Method for immediately feeding back burst failure message - Google Patents

Abstract

The invention discloses a method for instant feedback burst failure message, comprising the following steps: (1) determining the instant feedback channel allocation method; (2) when sending a hybrid automatic retransmission message burst failure, according to the instant feedback channel The allocation method allocates an immediate feedback channel; (3) using the instant feedback channel to feed back a HARM burst failure message. According to the method of the present invention, by predetermining the allocation method of the instant feedback channel, when sending the HARQ burst fails, the instant feedback channel is allocated according to the instant feedback channel allocation method, and the HARQ burst failure message can be fed back by using the instant feedback channel. Realize instant feedback of HARQ burst failure messages, reduce resource waste and improve transmission efficiency.

Description

Method for Immediate Feedback of Burst Failure Messages

technical field

The invention relates to the field of mobile communication, in particular to a method for instantly feeding back burst failure messages.

Background technique

As shown in Figure 1, one or more RSs (relay stations) are set between a base station (MR-BS, Multi-hop Relay Base Station) supporting multi-hop relay and a terminal (MS, Mobile Station). By relaying bursts between MR-BS and MS, RS can expand system coverage and increase system capacity. However, due to the introduction of RS, the design of Hybrid AutoRepeat Request (HARQ, Hybrid AutoRepeat Request) will be correspondingly complicated. For example, for the downlink, if an RS correctly receives and forwards the HARQ burst from the MR-BS, but the downstream substation connected to it loses the burst relayed by the RS, then if the current design Retransmission of lost bursts by the MR-BS will inevitably result in low efficiency and waste of resources. Therefore, a reasonable HARQ design should allow the RS that has correctly received the burst to resend the burst. However, how to make the MR-BS obtain the burst transmission failure message in time is still a problem.

In addition, 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 MAP (mapping) messages for channel allocation, non-transparent RS can be divided into centralized RS and distributed RS. RS. Centralized RS itself will generate prefixes and control messages, but channel resource allocation must be done by MR-BS, so the HARQ design of the relay system using centralized scheduling RS is the most complicated.

The existing technology provides a method for downlink HARQ in a multi-hop centralized relay network. The MR-BS has allocated the corresponding uplink feedback channel to each RS before sending a certain HARQ burst, and all uplink feedback must follow this The configuration proceeds.

The MR-BS judges the forwarding result of the transmitted HARQ burst among the RSs based on the encoding of the uplink feedback defined in the above method. If an RS receives the burst correctly in the first frame, it will forward the burst to the downlink RS in the second frame without giving an ACK (feedback) to the uplink. MR-BS can only receive ACK feedback from MS in specified frames. Correspondingly, if an RS does not correctly receive the burst in the first frame, the error burst will not be transmitted further, but the RS must NACK the corresponding code according to the uplink channel allocation indicated by the DL MAP (downlink mapping). Feedback) uploaded to MR-BS. Because the pre-allocation considers the successful transmission situation, once the transmission burst fails, there must be a waste of several frames.

From the above description, it can be seen that in the current multi-hop centralized scheduling relay network, downlink HARQ has problems of resource waste and excessive overhead. Therefore, a new downlink HARQ design is needed to overcome the above defects.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for instant feedback of burst failure messages to realize instant feedback of HARQ burst failure messages.

In order to solve the above-mentioned problems, the present invention provides a method for instant feedback of burst failure messages, comprising the following steps:

(1) Determine the instant feedback channel allocation method;

(2) When sending a HAR message burst failure, allocate an instant feedback channel according to the instant feedback channel allocation method;

(3) Using the instant feedback channel to feed back the HARM burst failure message.

The method for instant feedback of a burst failure message according to the present invention, wherein,

In step (1), when there is an uplink data channel, the method for allocating the immediate feedback channel includes: allocating the uplink data channel as the immediate feedback channel.

The method for instant feedback of a burst failure message according to the present invention, wherein,

In step (1), when there is no uplink data channel, the instant feedback channel allocation method includes: using a specific ranging code allocated by the base station to apply for uplink bandwidth, and the base station allocates the uplink bandwidth after receiving the ranging code as an instant feedback channel.

According to the method of the present invention, by pre-determining the allocation method of the instant feedback channel, when sending the HARQ burst fails, the instant feedback channel is allocated according to the instant feedback channel allocation method, and the HARQ burst failure message can be fed back by using the instant feedback channel. Realize instant feedback of HARQ burst failure messages, reduce resource waste and improve transmission efficiency.

Description of drawings

FIG. 1 is a schematic diagram of a wireless multi-hop relay network configuration according to a method described in an embodiment of the present invention;

Fig. 2 is the flowchart of the method described in the embodiment of the present invention;

Fig. 3 is a flowchart of step 21 of the method described in the embodiment of the present invention;

FIG. 4 is a schematic diagram of feeding back a HARQ burst failure according to a method in the prior art;

FIG. 5 is a schematic diagram of feeding back a HARQ burst failure when there is an uplink data channel according to the method according to an embodiment of the present invention;

Fig. 6 is a schematic diagram of feeding back a HARQ burst failure when there is no uplink data channel according to the method according to an embodiment of the present invention.

Detailed ways

In order to solve the disadvantages of the traditional technical solutions, the present invention further illustrates a method for instant feedback of burst failure messages according to the present invention through the following examples. The specific implementation is described in detail below, but not as a limitation of the present invention.

The method described in the embodiment of the present invention predetermines the allocation method of the instant feedback channel, and when sending the HARQ burst fails, allocates the instant feedback channel according to the allocation method of the instant feedback channel, and uses the instant feedback channel to feed back the HARQ burst failure message.

As shown in Figure 2, the method described in the embodiment of the present invention includes the following steps:

Step 21, determining the instant feedback channel allocation method;

Step 22, when sending a HARQ burst fails, allocate an instant feedback channel according to the instant feedback channel allocation method;

Step 23, using the instant feedback channel to feed back a HARQ burst failure message.

Wherein, as shown in Figure 3, step 21 includes the following steps:

Step 31, judging whether there is an uplink data channel; if yes, go to step 32; if not, go to step 33;

Step 32, setting the allocation method of the instant feedback channel as: assigning the uplink data channel as the instant feedback channel;

Step 33, sending a specific ranging code to apply for uplink bandwidth;

Step 34, judging whether the uplink bandwidth application is successful, if successful, go to step 35; if not successful, go to step 33;

Step 35, setting the allocation method of the instant feedback channel as: allocating the uplink bandwidth as an instant feedback channel.

In step 22, allocate the feedback uplink bandwidth to the downstream nodes according to the current situation and the rules in step 21.

In step 23, the downstream node immediately feeds back the transmission failure message using the obtained uplink bandwidth.

In the following, an example of retransmission bursts in a three-hop centralized scheduling relay network is used to compare different HARQ designs, so as to further illustrate the embodiments of the present invention. In the following analysis, it is assumed that the first hop burst fails and retransmission is required. For ease of comparison, assume that all delays are one frame. It can be seen from FIG. 4 that in the prior art, if end-to-end HARQ is adopted, the first hop fails to transmit a burst in the first frame, and the MR-BS cannot receive feedback until the sixth frame. However, if the method described in the embodiment of the present invention is adopted, it can be seen from Figure 5 that when there is an uplink data channel, the MR-BS in the second frame can receive feedback, and it can be seen from Figure 6 that when there is no uplink data channel, the fourth frame MR-BS -BS will be able to receive feedback.

Compared with the existing end-to-end feedback downlink HARQ design shown in Figure 4 (in which, the MR-BS has allocated uplink feedback channels to each RS before sending the HARQ burst, all uplink feedback must follow this configuration ), the method described in the embodiment of the present invention can more quickly feed back the sudden failure to the upstream site.

The method described in the embodiment of the present invention can realize the instant feedback of the HARQ burst failure message, reduce resource waste and improve transmission efficiency.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes All modifications and variations should belong to the scope of protection of the appended claims of the present invention.

Claims (1)

1. the method for an immediately feeding back burst failure message is characterized in that, may further comprise the steps:

(1) confirms the immediate feedback method for channel allocation: when having uplink data channels, distribute uplink data channels as the immediate feedback channel; When not having uplink data channels, utilize the specific ranging code uplink bandwidth application of base station assigns, if the upstream bandwidth success application, then the base station assigns upstream bandwidth is as the immediate feedback channel;

(2) when send mixing automatic resend messages burst failure, distribute the immediate feedback channel according to said immediate feedback method for channel allocation;

(3) utilize said immediate feedback channel feedback to mix automatic resend messages burst failure message.

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