CN101296167B - Method for requesting burst distribution transmission bandwidth for ascending mixed automatic re-transmission - Google Patents
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Abstract
The invention discloses a method for distributing transmission bandwidth for upstream HARQ bursty in a multi-hop relay network and an upstream HARQ bursty transmission method. The method for distributing transmission bandwidth comprises the following steps: when distributing retransmission bandwidth after the transmission failure on an access link and initial bandwidth transmission, a multi-hop base station selects one from two bandwidth distribution modes according to the communication quality of the access link to carry out distributing the transmission bandwidth for every HARQ bursty; when distributing retransmission bandwidth after transmission failure on a middle link, retransmission bandwidth is distributed to all links among the next grade nodes of receiving failure nodes and MR-BS. The transmission method comprises the following steps: bandwidth is distributed and the upstream HARQ bursty transmission is carried out; if the multi-hop base station receives successfully, the steps are finished; otherwise, the retransmission bandwidth is distributed to carry out retransmission. The proposal of the invention can adjust the bandwidth distribution according to the communication quality, thereby improving the utilization ratio of bandwidth and reducing the waste of transmission resources.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method for allocating a transmission bandwidth for an uplink HARQ (hybrid automatic repeat request) burst in a mobile multi-hop relay (MMR) network and transmitting the uplink HARQ burst.
Background
As shown in fig. 1, in the MMR system proposed by the ieee802.16j working group, one or several Relay Stations (Relay Stations, abbreviated as RSs) are arranged between the MMR-Base Station (Base Station, abbreviated as BS) and Mobile Stations (Mobile terminal, abbreviated as MS), and the coverage extension and the system capacity increase are achieved through continuous relaying of signals; one prior MMR system is configured as shown in fig. 1, where the signal transfer between the MR-BS and the MS is accomplished via one or several relays; wherein, the purpose of setting up RS2 and RS3 is to expand coverage; the purpose of RS1 is to increase system capacity. Proposal 802.16j-06/026r2 describes this in detail. In order to meet the requirements of different application scenarios, the RS can be set to be fixed or mobile. In addition, the RS is further differentiated into transparent and non-transparent depending on whether prefixes and MAPs need to be transmitted.
In an MMR network, two MAPs generation and resource allocation modes exist, in centralized scheduling, an MR-BS (multi-hop base station) generates MAPs and schedules resources for all links, and an RS has no resource scheduling capability; in distributed scheduling, the MR-BS and RS allocate MAPs to their neighbors, respectively. Due to the differences in the characteristics of RSs and the variable number of RSs, there are many different topologies in MMR.
In the proposal 802.16j-06_019, an access link, a relay link, a k-hop MS, a k-hop RS and a neighbor station (neighbor station) are defined. The access link is a link between the MS and its serving stations, which may be the RS, MR-BS and BS. The relay link is a link between the RS and its serving station, which may be the RS, MR-BS. k-hop MS means that the MS and MR-BS communicate over k hops. The k-hop RS means that RS and MR-BS communicate through k-hops. A station's neighbor is a station that only needs one hop to communicate with the station. The direct connection between each two network elements is called a neighbor hop (hop).
The uplink HARQ mechanism in the MMR network is different according to the characteristics of RS between the MS and the MR-BS. For a two-hop MS, if the data signal sent by the MS to the MR-BS depends on the transparent RS for relaying, the transparent RS only needs to relay the data signal sent by the MS to the MR-BS, and the MAPs broadcast message of the MR-BS can be directly received by the MS. And if the transparent RS successfully receives the data burst sent by the MS and knows that the MR-BS of the transparent RS does not correctly receive the HARQ data burst, the transparent RS replaces the MS to retransmit the HARQ burst. For MMR paths that rely on non-transparent RSs to convey signals, in order to reduce latency and save bandwidth, retransmissions start with the last node that correctly received a burst. Whether the transparent RS or the non-transparent RS without scheduling capability has no MAP generation and resource scheduling capability, bandwidth required for burst transmission on a plurality of links between the MS and the MR-BS must be allocated by the MR-BS, so that in the uplink, the MR-BS allocates a time slot of initial transmission bandwidth to the relay link in advance can affect the utilization efficiency of the bandwidth.
Therefore, there is no effective method for determining the time slot for which the MR-BS allocates transmission resources to the relay link in the UL (uplink) HARQ mechanism of the centralized resource scheduling.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method for allocating an initial transmission bandwidth to an uplink HARQ burst in a multi-hop relay network, which is used to solve the problem of resource waste caused by that a transmission resource pre-allocated to the HARQ burst on a relay link is not utilized in an MMR network.
The method comprises the following steps:
when the communication quality is high, the multi-hop base station selects a first bandwidth allocation mode to allocate initial transmission bandwidth for each HARQ burst, otherwise, selects a second bandwidth allocation mode to allocate initial transmission bandwidth for each HARQ burst:
the first method comprises the following steps: allocating the bandwidth required for the HARQ burst transmission for all links;
and the second method comprises the following steps: the multi-hop base station firstly allocates transmission bandwidth for an access link; after receiving a feedback signal that the relay station adjacent to the MS successfully receives the uplink burst, the multi-hop base station allocates a transmission bandwidth for the relay;
the method for judging the communication quality by the multi-hop base station comprises the following steps:
for an m-hop MS, the MR-BS records N continuous acknowledgement ACKm-2/failure NAKm-2 feedback signals received recently, and if the proportion of ACKm-2 is greater than a preset threshold value P, the communication quality of an access link is considered to be high; otherwise, the communication quality of the access link is considered to be low; the P is greater than 0.5 and less than 1.
Further, the selection of the bandwidth allocation mode by the multi-hop base station according to the communication quality of the access link means that: and when the communication quality is high, the multi-hop base station selects the first bandwidth allocation mode, otherwise, selects the second bandwidth allocation mode.
Further, the method for the multi-hop base station to judge the communication quality is as follows:
for an m-hop MS, the MR-BS records N continuous acknowledgement ACKm-2/failure NAKm-2 feedback signals received recently, and if the proportion of ACKm-2 is greater than a preset threshold value P, the communication quality of an access link is considered to be better; otherwise, the communication quality of the access link is considered to be poor.
The P is greater than 0.5 and less than 1.
Furthermore, one relay node correspondingly feeds back an ACK/NAK signal to the upper-level node according to the success/failure of the node in receiving the HARQ burst;
after receiving the ACKn/NAKn signal, one relay node correspondingly feeds back an ACKn +1/NAKn +1 signal to the node at the upper stage.
Further, before the first bandwidth allocation mode is carried out, the bandwidth allocation is carried out on the burst transmission in a default mode; the default mode can be any one of the two modes according to actual conditions.
Another technical problem to be solved by the present invention is to provide a method for allocating transmission bandwidth for uplink HARQ bursts in a multi-hop relay network, including:
when the retransmission bandwidth is distributed when the transmission on the intermediate link fails, the retransmission bandwidth is distributed to all links between the next-level node of the node with failed reception and the MR-BS;
when the initial transmission bandwidth and the retransmission bandwidth when the transmission on the access link fails are allocated:
when the communication quality is high, the multi-hop base station selects a first bandwidth allocation mode to allocate initial transmission bandwidth for each HARQ burst, otherwise, selects a second bandwidth allocation mode to allocate transmission bandwidth for each HARQ burst:
the first method comprises the following steps: when scheduling the initial transmission of an uplink HARQ burst, allocating the bandwidth required by the HARQ burst transmission to all links;
and the second method comprises the following steps: when scheduling an initial transmission of a HARQ burst, a multi-hop base station firstly allocates a transmission bandwidth for an access link; after receiving a feedback signal that the relay station adjacent to the MS successfully receives the uplink burst, the multi-hop base station allocates a transmission bandwidth for the relay;
the method for judging the communication quality by the multi-hop base station comprises the following steps:
for an m-hop MS, the MR-BS records N continuous acknowledgement ACKm-2/failure NAKm-2 feedback signals received recently, and if the proportion of ACKm-2 is greater than a preset threshold value P, the communication quality of an access link is considered to be high; otherwise, the communication quality of the access link is considered to be low; the P is greater than 0.5 and less than 1.
Further, the selection of the bandwidth allocation mode by the multi-hop base station according to the communication quality of the access link means that: and when the communication quality is high, the multi-hop base station selects the first bandwidth allocation mode, otherwise, selects the second bandwidth allocation mode.
Further, the method for the multi-hop base station to judge the communication quality is as follows:
for an m-hop MS, the MR-BS records N continuous acknowledgement ACKm-2/failure NAKm-2 feedback signals received recently, and if the proportion of ACKm-2 is greater than a preset threshold value P, the communication quality of an access link is considered to be better; otherwise, the communication quality of the access link is considered to be poor.
The P is greater than 0.5 and less than 1.
Furthermore, one relay node correspondingly feeds back an ACK/NAK signal to the upper-level node according to the success/failure of the node in receiving the HARQ burst;
after receiving the ACKn/NAKn signal, one relay node correspondingly feeds back an ACKn +1/NAKn +1 signal to the node at the upper stage.
Further, before the first bandwidth allocation mode is carried out, the bandwidth allocation is carried out on the burst transmission in a default mode; the default mode can be any one of the two modes according to actual conditions.
Another technical problem to be solved by the present invention is to provide a method for transmitting an uplink hybrid automatic repeat request HARQ burst in a multi-hop relay network, comprising:
(a) when the communication quality is high, the multi-hop base station selects a first bandwidth allocation mode to allocate initial transmission bandwidth for each HARQ burst, otherwise, selects a second bandwidth allocation mode to allocate transmission bandwidth for the HARQ bursts:
the first method comprises the following steps: when scheduling the initial transmission of an uplink HARQ burst, allocating the bandwidth required by the HARQ burst transmission to all links;
and the second method comprises the following steps: when scheduling an initial transmission of a HARQ burst, a multi-hop base station firstly allocates a transmission bandwidth for an access link; after receiving a feedback signal that the relay station adjacent to the MS successfully receives the uplink burst, the multi-hop base station allocates a transmission bandwidth for the relay;
the method for judging the communication quality by the multi-hop base station comprises the following steps:
for an m-hop MS, the MR-BS records N continuous acknowledgement ACKm-2/failure NAKm-2 feedback signals received recently, and if the proportion of ACKm-2 is greater than a preset threshold value P, the communication quality of an access link is considered to be high; otherwise, the communication quality of the access link is considered to be low; said P is greater than 0.5 and less than 1;
(b) performing uplink HARQ burst transmission according to the allocated bandwidth; if the multi-hop base station successfully receives the HARQ burst, ending the process; otherwise, if the transmission on the intermediate link fails, executing (c), otherwise returning to (a);
(c) and allocating retransmission bandwidth to all links between the nodes at the next stage of the nodes with failed reception and the MR-BS.
Further, in step (a): and when the communication quality is high, the multi-hop base station selects the first bandwidth allocation mode, otherwise, selects the second bandwidth allocation mode.
Further, in step (a), the method for the multi-hop base station to determine the communication quality includes:
for an m-hop MS, the MR-BS records N continuous acknowledgement ACKm-2/failure NAKm-2 feedback signals received recently, and if the proportion of ACKm-2 is greater than a preset threshold value P, the communication quality of an access link is considered to be better; otherwise, the communication quality of the access link is considered to be poor.
The P is greater than 0.5 and less than 1.
Further, in the step (b), one relay node feeds back ACK/NAK signals to the previous node according to the HARQ burst receiving success/failure of the node;
after receiving the ACKn/NAKn signal, one relay node correspondingly feeds back an ACKn + 1/NAKn + 1 signal to the node at the upper stage.
After the scheme of the invention is adopted, the bandwidth allocation can be adjusted according to the actual quality condition of communication, the utilization efficiency of the bandwidth is improved, the waste of transmission resources is reduced, and larger time delay cannot be caused.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, and are not intended to limit the invention. In the drawings:
fig. 1 is a diagram of a wireless multi-hop relay network configuration in the prior art; and
fig. 2 is a flowchart illustrating an embodiment of a method for allocating initial transmission bandwidth for an uplink hybrid automatic repeat request HARQ burst in a multi-hop relay network according to the present invention; and
FIG. 3 is an MMR network topology in an example application of the present invention;
fig. 4 is a schematic flow chart of a MR-BS pre-allocating transmission resources to all links between an MS and the MR-BS in the prior art; and
FIG. 5 is a schematic flow chart of a prior art MR-BS not allocating transmission resources to a link between an MS and the MR-BS in advance; and
FIG. 6 is a schematic flow chart of an uplink HARQ embodiment in which an MR-BS decides whether to pre-allocate transmission resources to a link between an MS and the MR-BS according to the condition of an access link in the method of the present invention; and
fig. 7 is a flowchart illustrating an uplink HARQ embodiment in case that the MR-BS and the RS1 fail to receive the initial transmission in the present invention.
Detailed Description
The technical solution of the present invention will be described in more detail with reference to the accompanying drawings and examples.
The invention provides a method for allocating transmission bandwidth for uplink HARQ burst in a multi-hop relay network, which comprises the following steps:
when the retransmission bandwidth when the transmission on the intermediate link fails is allocated, the retransmission bandwidth is allocated to all links between the next-stage node of the node with failed reception and the MR-BS.
When the initial transmission bandwidth and the retransmission bandwidth when the transmission on the access link fails are allocated:
the MR-BS allocates transmission bandwidth on each link for one uplink HARQ burst in one of the following two ways:
the first method comprises the following steps: the MR-BS first allocates the bandwidth required for this HARQ burst transmission to all links between the MS and the MR-BS.
And the second method comprises the following steps: the MR-BS firstly allocates uplink burst transmission bandwidth for an access link, if data is successfully transmitted on the access link, namely the receiving of RS which is directly communicated with the MS is successful/failed, an ACK (acknowledgement)/NAK (failure) signal is fed back to a previous-stage node, if the previous-stage node is the RS, the previous-stage node feeds back an ACK1/NAK1 signal to the previous-stage node after receiving the ACK/NAK signal, namely a relay node correspondingly feeds back the ACK/NAK signal to the previous-stage node according to the receiving of the HARQ burst success/failure of the relay node; after receiving the ACKn/NAKn signal, one relay node correspondingly feeds back an ACKn + 1/NAKn + 1 signal to the node at the upper stage. If the MS is an m-hop MS, the MR-BS allocates transmission bandwidth to the relay link after receiving the ACKm-2 signal fed back by the adjacent RS.
The expressions "first" and "second" are used herein only to distinguish between the two ways and are not limiting.
Before scheduling an uplink HARQ burst transmission, the MR-BS determines the selected bandwidth allocation mode according to the communication quality of an access link: and when the communication quality of the access link is high or better, selecting the first bandwidth allocation mode, and otherwise, selecting the second bandwidth allocation mode.
In the communication process, when the MR-BS allocates the bandwidth required by transmission for each uplink HARQ burst, the bandwidth allocation mode of the burst is selected according to the current communication quality; before the first bandwidth allocation mode is carried out, the bandwidth allocation is carried out on the burst transmission in a system default mode; the default mode here can be any one of the two modes according to actual situations.
The method for judging the communication quality of the access link by the MR-BS comprises the following steps: for an m-hop MS, the MR-BS receives ACKm-2/NAKm-2 signals fed back by the adjacent RS, and if the proportion of the ACKm-2 signals in the recently received N continuous feedback signals is greater than a threshold value P, the communication quality is high; otherwise, the communication quality is low. And P is a threshold number which is more than 0.5 and less than 1, and represents the proportion of the ACK signals in the N feedback signals.
The values of N and P are determined according to simulation results, and under the condition of the same channel change, the values of N and P are determined under the condition of minimum time delay and highest bandwidth utilization efficiency.
For an M-hop MS, the RS adjacent to the MR-BS feeds back ACKm-2/NAKm-2 signals to the MR-BS according to the receiving condition of the uplink burst: if the uplink HARQ burst receiving of the access link fails in the uplink HARQ burst transmission process, the RS adjacent to the MR-BS feeds back a NAKm-2 (negative acknowledgement) signal to the MR-BS; and if the access link uplink HARQ burst is successfully received, the RS adjacent to the MR-BS feeds back an ACKm-2 signal to the MR-BS.
In the communication process, the adjacent RS in the HARQ ACK region should feed back both ACK/NAK signals to the MR-BS for the received downlink HARQ burst and ACKm-2/NAKm-2 signals to the MR-BS for the received uplink HARQ burst, and in order to make the MR-BS distinguish the two different feedbacks, it may be, but is not limited to, put them at different positions in the uplink frame of the RS, respectively.
The present invention also provides a method for allocating initial transmission bandwidth for uplink hybrid automatic repeat request HARQ burst in a multi-hop relay network, as shown in fig. 2, which is consistent with the method for allocating initial transmission bandwidth and retransmission bandwidth when transmission fails on an access link in the above method.
The invention also provides a method for transmitting the uplink hybrid automatic repeat request HARQ in the multi-hop relay network, which comprises the following steps:
(a) when the communication quality of an access link is high, the multi-hop base station selects the first bandwidth allocation mode, otherwise, selects the second bandwidth allocation mode to allocate transmission bandwidth for HARQ burst:
the first method comprises the following steps: when scheduling the initial transmission of an uplink HARQ burst, allocating the bandwidth required by the HARQ burst transmission to all links;
and the second method comprises the following steps: when scheduling an initial transmission of a HARQ burst, a multi-hop base station firstly allocates a transmission bandwidth for an access link; after receiving a feedback signal that the relay station adjacent to the MS successfully receives the uplink burst, the multi-hop base station allocates a transmission bandwidth for the relay;
(b) performing uplink HARQ burst transmission according to the allocated bandwidth; if the multi-hop base station successfully receives the HARQ burst, ending the process; otherwise, if the transmission on the intermediate link fails, executing (c), otherwise returning to (a);
(c) and allocating retransmission bandwidth to all links between the nodes at the next stage of the nodes with failed reception and the MR-BS.
The method for judging the communication quality is the same as before, and is not repeated.
This is further illustrated below by means of several application examples.
These several application examples are illustrated in a topology in an MMR network, as shown in fig. 3, where the MS is a three-hop MS, and the communication between the MS and the MR-BS is relayed through the non-transparent centralized RS1 and the transparent RS2, which acts as a data relay in the communication. The MS cannot directly communicate with the MR-BS, the RS1 relays signals between the RS2 and the MR-BS, the RS2 relays data signals between the MS and the RS1, and the MS can directly receive the MAP message sent by the RS 1. The examples selected herein are intended only to illustrate and explain the present invention and are not intended to limit the present invention. In practical application, each level of RS can be transparent or opaque;
when an MR-BS needs to schedule an uplink HARQ burst initial transmission, firstly, whether the proportion of an ACK1 signal in N continuous ACK1/NAK1 signals fed back by a recently received RS1 is larger than a threshold value P is judged, if so, the communication quality of an access link is high, and the transmission bandwidth of the uplink HARQ burst is distributed to all links between an MS and the MR-BS; otherwise, if the communication quality of the access link is low, only the uplink HARQ burst transmission bandwidth is allocated to the access link.
For comparison, two detailed procedures for allocating transmission bandwidth for HARQ burst in the prior art are described below, and the procedures are performed in the MMR network with the topology shown in fig. 3. Fig. 4 is a flowchart of an uplink HARQ process in which an MR-BS pre-allocates uplink burst transmission resources to all links between an MS and the MR-BS in the prior art.
In the flow shown in fig. 4, it is assumed that the transmission delay of data is one frame and the processing delay of data is one frame. When one uplink HARQ burst is to be scheduled, the MR-BS allocates uplink HARQ burst transmission bandwidth to MS-to-RS 2, RS 2-RS 1, and RS 1-MR-BS links through UL MAP messages, which are relayed by RS1 to RS2 and the MS. After obtaining the transmission bandwidth, the MS sends an uplink HARQ burst to the RS2, the RS2 receives an error, feeds back a NAK signal to the RS1 in an ACKCH region, and after receiving the NAK signal fed back by the RS2, the RS1 feeds back the NAK signal to the MS through the HARQ ACK bitmap IE and simultaneously feeds back a NAK1 signal to the MR-BS in the ACKCH region. After receiving the NAK1 signal fed back by RS1, the MS knows that the transmission of the uplink HARQ burst is erroneous.
The retransmission procedure is as follows:
the MR-BS allocates uplink HARQ burst retransmission bandwidth to the links of the MS to the RS2, the RS2 to the RS1 and the RS1 to the MR-BS. And the MS performs burst retransmission on the allocated HARQ burst retransmission bandwidth. The RS2 receives the retransmission burst, combines the retransmission burst with the initially received burst, decodes the retransmission burst correctly, transmits the correctly received burst to the RS1 on the pre-allocated resource, and feeds back an ACK signal to the RS 1. After receiving the ACK signal sent by the RS2, the RS1 feeds back the ACK signal to the MS and simultaneously feeds back an ACK1 signal to the MR-BS. The MR-BS receives the ACK1 signal and knows that RS2 received correctly. RS1 receives the burst success transmitted by RS2, feeds back an ACK signal to RS2, and simultaneously transmits this correctly received burst and the feedback ACK signal to the MR-BS on the pre-allocated resources, so that RS2 knows that the burst it transmitted was correctly received by RS 1. And the MR-BS knows that the uplink HARQ burst is correctly received by the RS1 after receiving the ACK signal fed back by the RS 1. And the MR-BS correctly receives the HARQ burst sent by the RS1 and feeds back an ACK signal to the RS 1.
As can be seen from the flow shown in fig. 4, the MR-BS pre-allocated transmission bandwidth is wasted due to the reception failure of the access link.
Fig. 5 is a flowchart of an uplink HARQ process in the prior art, in which a burst transmission bandwidth is not pre-allocated to all links between an MS and an MR-BS. In the flow shown in fig. 5, it is assumed that the transmission delay of data is one frame and the processing delay of data is one frame. When one uplink HARQ burst is to be scheduled, the MR-BS allocates an uplink HARQ burst transmission bandwidth to the link between the MS and RS2 through UL MAP, which is forwarded to the MS by RS 1. After obtaining the transmission bandwidth, the MS sends an uplink HARQ burst to the RS2, the RS2 fails to receive and feeds back NAK to the RS1, the RS1 feeds back NAK to the MS through the HARQ ACK Bitmap IE after receiving the NAK signal fed back by the RS2, and simultaneously feeds back NAK1 to the MR-BS in the ACKCH region. The MS receives the NAK signal fed back by the RS1 and knows that the uplink burst transmission fails. And after receiving the NAK1 signal sent by the RS1, the MR-BS knows that the RS2 fails to receive, allocates the uplink burst retransmission bandwidth from the MS to the RS2, and the MS retransmits the uplink HARQ burst on the allocated retransmission bandwidth. And the RS2 receives the retransmitted HARQ burst, combines the retransmitted HARQ burst with the received HARQ burst, decodes the HARQ burst, successfully receives the HARQ burst by the RS2, and feeds an ACK signal back to the RS 1. The RS1 receives the ACK signal fed back by the RS2, feeds back ACK to the MS, and feeds back an ACK1 signal to the MR-BS. And after receiving the ACK1 signal fed back by the RS1, the MR-BS knows that the burst is correctly received by the RS2, and allocates the transmission bandwidth of the uplink HARQ burst to the links from the RS2 to the RS1 and from the RS1 to the MR-BS. The RS2 transmits the correctly received HARQ burst to the RS1 over the allocated bandwidth, the RS1 receives successfully, and feeds back an ACK signal to the RS2, and simultaneously transmits the correctly received burst and the feedback ACK signal to the MR-BS over the pre-allocated bandwidth. And the MR-BS receives the ACK signal fed back by the RS1, knows that the burst is correctly received by the RS1, receives the burst sent by the RS1 correctly and feeds back the ACK signal to the RS 1.
In the flow shown in fig. 5, the waste of resources is reduced compared to the flow shown in fig. 4, but the uplink HARQ burst transmission delay is increased.
Fig. 6 is a flowchart of an uplink HARQ embodiment in which the MR-BS determines whether to pre-allocate transmission resources to the link between the MS and the MR-BS according to the condition of the access link in the method of the present invention. It is assumed that the transmission delay of data is one frame and the processing delay of data is one frame.
Assuming that the MR-BS schedules an uplink HARQ burst, the following decision is made: in the recently received N consecutive ACK1/NAK1 feedback signals, the proportion of ACK1 is lower than the threshold value P. It is shown that in the communication process, the probability that the HARQ burst sent by the MS is correctly received by the RS2 is low, and the communication quality of the access link is low; therefore, the MR-BS selects the second allocation mode, that is, only allocates the transmission bandwidth to the access link between the MS and the RS2, after the MS obtains the transmission bandwidth, the MS sends the uplink HARQ burst to the RS2, and the RS2 determines whether the reception is correct. The RS2 fails to receive, and feeds back a NAK signal to the RS 1. The RS1 receives the NAK signal fed back by the RS2, feeds back the NAK signal to the MS and simultaneously feeds back the NAK1 signal to the MR-BS. After receiving the NAK signal fed back by RS1, the MS knows that its uplink HARQ burst transmission failed. After receiving the NAK1 signal fed back by the RS1, the MR-BS knows that the RS2 fails to receive the uplink HARQ burst.
At this time, the MR-BS needs to allocate retransmission resources for the uplink HARQ burst, and needs to allocate initial transmission resources for the uplink HARQ burst ready for initial transmission, and first determines the condition of the access link, at this time, the proportion of the ACK1 signal in the N ACK1/NAK1 signals fed back by the RS1 exceeds the preset threshold P, and then the MR-BS allocates uplink HARQ burst transmission resources and retransmission resources from the MS to the RS2, the RS2 to the RS1, and the RS1 to the MR-BS link. The following transmission steps are performed according to the steps shown in fig. 4; the retransmission step is performed according to the retransmission flow in fig. 4.
In the flow shown in fig. 6, the waste of resources is reduced to a certain extent without increasing the time delay.
Fig. 7 is a flowchart illustrating an uplink HARQ embodiment in case that the MR-BS and the RS1 fail to receive the initial transmission, where in the flowchart illustrated in fig. 7, it is assumed that the transmission delay of data is one frame and the processing delay of data is one frame. This embodiment is described by taking an example that the MR-BS selects to allocate the transmission bandwidth in the first manner according to the quality of the access link during initial transmission and retransmission, that is, to allocate transmission resources to all links on the path from the mobile station MS to the MR-BS in advance, but it also belongs to the protection scope of the present invention that the MR-BS allocates the bandwidth in the second manner during initial transmission, that is, the MR-BS does not allocate transmission resources from RS2 to RS1 and from RS1 to the MR-BS in advance.
Firstly, the MR-BS allocates resources to all links between the MS and the MR-BS, the RS2 successfully receives an uplink HARQ burst sent by the MS, the burst is sent to the RS1 on the pre-allocated resources, meanwhile, an ACK signal is fed back to the RS1, and the RS1 feeds back the ACK signal to the MS after receiving the ACK signal sent by the RS 2. RS1 fails reception, feeds back a NAK signal to the MR-BS, and feeds back a NAK signal to RS 2. The MR-BS receives the NAK signal sent by RS1, knows that RS1 fails to receive the burst of RS2, and at this time, it is a transmission failure on the intermediate link, and therefore when performing retransmission bandwidth allocation, allocates retransmission bandwidth to all links between the next-stage node of the node that fails to receive and the MR-BS, that is, allocates uplink HARQ burst retransmission bandwidth to the link between RS2 and RS1, and allocates uplink HARQ burst retransmission bandwidth to the link between RS1 and the MR-BS. The RS2 transmits the correctly received burst to the RS1 over the allocated bandwidth, the RS1 combines the originally received burst and the newly received burst, decodes, correctly feeds back the ACK signal to the MR-BS, feeds back the ACK signal to the RS2, and transmits the correctly received burst to the MR-BS over the pre-allocated bandwidth. And the MR-BS receives the error and feeds back NAK to the RS1, and the NAK is still failed to be transmitted on the intermediate link at the moment, so that when retransmission bandwidth allocation is carried out, retransmission bandwidth is allocated to all links between the next-level node of the node with failed reception and the MR-BS, namely, retransmission bandwidth is allocated to the link between the RS1 and the MR-BS. The RS1 sends the bursts to the MR-BS over the allocated bandwidth. After the MR-BS decodes correctly, ACK is fed back to RS 1.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (3)
1. A method for allocating initial transmission bandwidth for an uplink hybrid automatic repeat request (HARQ) burst in a multi-hop relay network comprises the following steps:
when the communication quality of an access link is high, the multi-hop base station MR-BS selects a first bandwidth allocation mode to allocate initial transmission bandwidth for each HARQ burst, otherwise, selects a second bandwidth allocation mode to allocate initial transmission bandwidth for each HARQ burst; wherein,
the first bandwidth allocation method is as follows: allocating the bandwidth required for the HARQ burst transmission for all links;
the second bandwidth allocation method: MR-BS allocates transmission bandwidth for access link; after receiving a feedback signal that the relay station RS adjacent to the MS successfully receives the uplink burst, the MR-BS allocates a transmission bandwidth for the relay link;
the method for judging the communication quality by the MR-BS comprises the following steps:
for an m-hop MS, the MR-BS records N continuous acknowledgement ACKm-2/failure NAKm-2 feedback signals received recently, and if the proportion of ACKm-2 is greater than a preset threshold value P, the communication quality of an access link is considered to be high; otherwise, the communication quality of the access link is considered to be low; said P is greater than 0.5 and less than 1;
and the feedback signal of the ACKm-2/failure NAKm-2 is fed back to the MR-BS by the RS adjacent to the MR-BS according to the receiving condition of the uplink burst: if the uplink HARQ burst receiving of the access link fails in the uplink HARQ burst transmission process, the RS adjacent to the MR-BS feeds back a NAKm-2 signal to the MR-BS; and if the uplink HARQ burst of the access link is successfully received, the RS adjacent to the MR-BS feeds back an ACKm-2 signal to the MR-BS.
2. The method of claim 1, wherein: one relay station RS correspondingly feeds back an ACK/NAK signal to the upper-level node according to the success/failure of the node to receive the HARQ burst;
after receiving the ACKn/NAKn signal, one relay station RS feeds back an ACKn +1/NAKn +1 signal to the node at the upper stage correspondingly.
3. The method of claim 1, wherein: before the first bandwidth allocation mode is selected, performing bandwidth allocation on burst transmission in a default mode; the default mode can be any one of the two modes according to actual conditions.
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| CN101807983B (en) * | 2009-02-13 | 2013-10-16 | 中兴通讯股份有限公司 | Method and system for overcoming confliction between uplink hybrid automatic retransmission request and burst traffic |
| CN101909286B (en) * | 2009-06-03 | 2013-03-27 | 普天信息技术研究院有限公司 | Cooperative communication method of relay network, multi-hop base station and relays |
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| EP2833692A4 (en) * | 2012-04-23 | 2015-09-30 | Huawei Tech Co Ltd | Method, base station, and system for data transmission |
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