WO2009055969A1

WO2009055969A1 - Method of automatic retransmission in wireless communication network and device thereof

Info

Publication number: WO2009055969A1
Application number: PCT/CN2007/003106
Authority: WO
Inventors: Qing Shi; Wei Ni; Jimin Liu; Jiming Chen
Original assignee: Alcatel Shanghai Bell Company, Ltd.; Alcatel Lucent
Priority date: 2007-11-01
Filing date: 2007-11-01
Publication date: 2009-05-07
Also published as: CN101855857B; CN101855857A

Abstract

A method of automatic retransmission in source equipment of wireless communication network and device thereof are disclosed. The source equipment first receives an automatic retransmission request message from a next level network equipment; second, it retransmits the signal previously sent with an increased output power according to the automatic retransmission request message. During the process of retransmission, the source equipment adjusts its output power (increasing its output power) to retransmit the signal previously sent every time that it receives an automatic request message. Because the original equipment retransmits the signal previously sent with an increased output power, the reliability of signal retransmission is greatly increased, and average network delay time is thereby reduced.

Description

Method and apparatus for automatic retransmission in a wireless communication network

The present invention relates to wireless communication networks, and more particularly to an apparatus and method for retransmitting signals based on automatic repeat request in a wireless communication network. Background technique

Currently, wireless communication networks typically employ an automatic retransmission mechanism (ARQ) to solve the problem of data transmission failure. Specifically, when the next-level network device receives the signal from the upper-level network device, it will check the signal. When the verification result is correct, the next-level network device forwards the signal to the next-level network device; when the verification result is an error, the next-level network device sends an automatic repeat request (ARQ) message to the upper level. The network device, when the upper-level network device receives the automatic repeat request (ARQ) message, retransmits the previously transmitted signal until the next-level network device receives the correct transmission signal or reaches the preset maximum The number of retransmissions, the next-level network device forwards the received signal from the upper-level network device to the next-level network device.

Specifically, FIG. 1 shows a schematic diagram of a network structure of a wireless relay network according to the prior art, and shows a user equipment 1, a relay station 2, and a base station 3. Those skilled in the art will appreciate that although only one relay station is shown in the figures, multiple relay stations may be included in a particular application. More specifically, when the relay station 2 shown in FIG. 1 operates in the decoding forward relay mode, after receiving the signal from the user equipment 1, the relay station checks the signal, and when the verification result is correct, The relay station 2 forwards the signal to the base station 3; when the check result is an error, the relay station 2 sends an automatic repeat request (ARQ) message to the user equipment 1, when the user equipment 1 receives the automatic repeat request (ARQ) message The previously transmitted signal is retransmitted until the relay station 2 receives the correct transmission signal or reaches the preset maximum number of retransmissions, and the relay station 2 forwards the received signal from the user equipment 1 to the base station 3. Those skilled in the art should understand that the verification may include a cyclic redundancy (CRC) check or parity, and may also include other types of code check methods. When the relay station 2 shown in FIG. 1 operates in the amplifying forward relay mode, after receiving the signal from the user equipment 1, the relay station 2 does not decode the signal, but only amplifies the signal and forwards it to The base station 3, i.e., the relay station 2, does not verify the signal from the user equipment 1. When the base station 3 receives the signal forwarded from the relay station 2, it checks it. When the check result is an error, the base station 3 sends an automatic repeat request (ARQ) message to the relay station 2, and then the relay station 2 forwards it to the user again. Device 1, after receiving the automatic repeat request (ARQ) message, the user equipment 1 retransmits the previously transmitted signal until the base station 3 receives the correct transmission signal or reaches the preset maximum number of retransmissions. Stop retransmitting the previously sent signal.

In the signal retransmission process of the wireless communication network based on the automatic repeat request according to the prior art, the upper-level network device periodically increases its output power to retransmit the previously transmitted signal for a fixed period of time. Internally, the upper-level network devices retransmit the previously transmitted signals with the same output power. Therefore, in the case where the signal-to-noise ratio is low, there is a high possibility that the retransmission error occurs again when the upper-level network device retransmits the previously transmitted signal with the same output power in a fixed time period. This leads to an increase in the number of retransmissions, which further leads to an increase in the average delay time of the entire network. Summary of the invention

In order to solve the above-mentioned shortcomings in the prior art, the present invention provides a method and apparatus for automatically retransmitting a signal based on an automatic retransmission request in a source device of a wireless communication network, by which the source device receives an automatic weight. After transmitting the request message, the previously transmitted signal is retransmitted with increased output power to improve the reliability of signal retransmission, thereby reducing the average delay time of the entire network.

According to an aspect of the present invention, a method for automatically retransmitting a signal based on an automatic retransmission request in a source device of a wireless communication network is provided, comprising the steps of: receiving a device from a next-level network Automatic retransmission request message; retransmitting the previously transmitted signal with increased output power according to the automatic retransmission request message. According to another aspect of the present invention, there is provided an automatic retransmission apparatus for automatically retransmitting a signal based on an automatic retransmission request in a source device of a wireless network, comprising: receiving means for receiving An automatic retransmission request message from the next-level network device; a signal retransmission device, configured to retransmit the previously transmitted signal with the increased output power according to the automatic retransmission request message.

In the present invention, when the result of the verification of the received signal from the source device by the next-level network device is an error, the next-level network device sends an automatic retransmission request to the source device, and the source device according to the automatic The retransmission request retransmits the previously transmitted signal with increased output power. During signal retransmission, each time the source device receives an automatic retransmission request message, it adjusts its output power (increases its output power) to retransmit the previously transmitted signal, since the source device is at increased output power. The previously transmitted signal is retransmitted, so the reliability of the signal retransmission is greatly increased, thereby reducing the average delay time of the network. DRAWINGS

Other features, objects, and advantages of the present invention will become more apparent from the detailed description of the accompanying drawings.

1 is a schematic diagram showing the network structure of a wireless relay network according to the prior art; FIG. 2a is a schematic diagram showing the network structure of a wireless relay network according to the present invention, wherein the relay station operates in a decoding forward relay mode of operation. ;

2b is a schematic diagram showing the network structure of a wireless relay network according to the present invention, wherein the relay station operates in an amplified forward relay mode of operation;

3 illustrates a flow diagram of a method for automatically retransmitting a signal based on an automatic repeat request in a source device of a wireless communication network, in accordance with an embodiment of the present invention;

4 shows a flow diagram of a method for automatically retransmitting a signal based on an automatic repeat request in a source device of a wireless communication network, in accordance with a preferred embodiment of the present invention;

Figure 5 illustrates a wireless communication network in accordance with another preferred embodiment of the present invention. A flowchart of a method for automatically retransmitting a signal based on an automatic repeat request in a source device;

6 is a block diagram showing an automatic retransmission apparatus for automatically retransmitting a signal based on an automatic retransmission request in a source device of a wireless network according to an embodiment of the present invention;

Figure 7 is a block diagram showing the structure of an automatic retransmission apparatus for automatically retransmitting signals based on an automatic retransmission request in a source device of a wireless network, in accordance with a preferred embodiment of the present invention;

Figure 8 is a block diagram showing the structure of an automatic retransmission apparatus for automatically retransmitting signals based on an automatic retransmission request in a source device of a wireless network in accordance with another preferred embodiment of the present invention.

The same or similar reference numerals in the drawings denote the same or similar components. detailed description

The invention will be described in detail below with reference to the accompanying drawings.

Figure 2a shows a schematic diagram of the network structure of a wireless relay network in accordance with the present invention, wherein the relay station operates in a decoding forward relay mode of operation.

The network structure diagram shown in Fig. 2a includes a user equipment 1, a relay station 2, and a base station 3. It will be understood by those skilled in the art that although only one relay station is shown in the figure, in a specific application, a plurality of relay stations, that is, a multi-hop relay network may be included. The relay station 2 in the figure operates in the decoding forward relay mode of operation.

Specifically, since the relay station 2 operates in the decoding forward relay operation mode, when the relay station 2 receives the signal from the user equipment 1, the relay station 2 does not directly forward the signal to the base station 3, but performs the signal calibration. Test. When the check result is correct, the relay station 2 forwards the signal to the base station 3; when the check result is an error, the relay station 2 transmits an automatic repeat request (ARQ) message to the user equipment 1. After the user equipment 1 receives the automatic repeat request (ARQ) message from the relay station 2, its output power is adjusted according to the automatic repeat request (increase the output power), and then the previously transmitted signal is increased in output power. Retransmit. If the relay station 2 receives the retransmitted signal, the retransmitted signal If the result of the verification is still an error, the above steps are repeated until the relay station 2 receives the correct retransmission signal or reaches the preset maximum number of retransmissions, and then forwards the received signal from the user equipment 1 to Base station 3.

Similarly, when the base station 3 receives the signal from the relay station 2, it checks the signal. When the check result is an error, the base station 3 transmits an automatic repeat request (ARQ) message to the relay station 2. When the relay station 2 receives the automatic repeat request (ARQ) message from the base station 3, adjusts its output power (increases the output power) according to the automatic repeat request, and then performs the previously transmitted signal with the increased output power. Retransmission. If the result of verifying the retransmitted signal is still an error after receiving the retransmitted signal, the above steps are repeated until the base station 3 receives the correct retransmission signal or reaches the preset maximum. The number of retransmissions stops retransmitting the previously transmitted signal.

In the wireless relay network shown in FIG. 2a, after receiving the automatic retransmission request message from the next-level network device, the user equipment and the relay station can adjust their output power (increase their output power) and The transmitted signal is retransmitted with increased output power.

Figure 2b is a diagram showing the network structure of a wireless relay network in accordance with the present invention, wherein the relay station operates in an amplified forward relay mode of operation.

The network structure diagram shown in Fig. 2b includes user equipment Γ, relay station 2, and base station 3. Those skilled in the art will appreciate that although only one relay station is shown in the figures, in a particular application, multiple relay stations may be included. The relay station 2 shown in the figure operates in the extended forward relay mode.

Specifically, since the relay station 2 operates in the forward forward relay operation mode, when the relay station 2 receives the signal from the user equipment 1, the signal is not verified, but the signal is directly amplified. Forwarding to the base station 3, when the base station 3 receives the signal forwarded from the relay station 2, it checks the signal. When the check result is an error, the base station 3' sends an automatic repeat request (ARQ) message to the relay station 2, and the relay station 2 receives the automatic repeat request message and forwards it to the user equipment 1, and then forwards it to the user equipment 1. When the user equipment 1 receives the automatic retransmission request (ARQ) message from the relay station 2, adjusts its output power according to the automatic retransmission request (increases the output power), and then increases the previously transmitted signal. The output power is retransmitted. If the base station 3 receives the retransmitted signal, the weight is If the result of the signal verification is still an error, the above steps are repeated until the base station 3 receives the correct retransmission signal or reaches the preset maximum number of retransmissions, and stops the heavy transmission of the previously transmitted signal. pass.

In the wireless relay network shown in FIG. 2b, only the user equipment 调整 adjusts its output power (increases its output power) according to the automatic retransmission request message received from the base station, and increases the previously transmitted signal. The output power is retransmitted, while the relay station 2 does not make power adjustments.

In the above-mentioned FIG. 2a and FIG. 2b, a schematic diagram of the network structure of the wireless relay network according to the present invention in two relay modes of operation is briefly described. The present invention will be further described in detail below with reference to FIGS. 3-8. Description:

3 shows a flow diagram of a method for automatically retransmitting a signal based on an automatic repeat request in a source device of a wireless communication network, in accordance with an embodiment of the present invention.

In this embodiment, step S11 is first performed to receive an automatic retransmission request message from the next-level network device.

Next, step S12 is performed to determine a new output power according to the automatic retransmission request message, and the new discovery power should be increased by a certain amount compared with the original output power, thereby improving the reliability of the retransmission signal;

Finally, step S13 is performed to retransmit the previously transmitted signal with the new output power.

In this embodiment, after the next-level network device receives the signal from the source device, the signal is code-checked. The code check may include cyclic redundancy code (CRC) calibration or parity, and may also include other types of code check methods, as long as the signal from the source device can be correctly or not transmitted during transmission. It is to be understood that it should be understood by those skilled in the art and will not be described herein.

If the verification result is correct, the next-level network device sends a positive acknowledgment signal (ACK) to the source device, and forwards the received signal from the source device to the next-level network device; if the verification result is an error, the next The primary network device sends an automatic repeat request message (ARQ, or NAK) to the source device. The source device may include a user equipment, and may also include The mobile relay station can be adjusted as long as the source device can adjust the output power according to the received automatic retransmission request, which should be understood by those skilled in the art, and will not be described herein.

For step S12, in a preferred embodiment, in the event of one or more retransmission failures, the source device may receive multiple automatic retransmission requests for the same signal (within a predetermined number of times), such that each retransmission The reliability is improved compared with the previous transmission, and the source device needs to adjust the output power of each retransmission. Preferably, the source device can save the output power of each retransmission, and when another retransmission request is received, simply add the source output power value to the power delta value to determine a new output power value. More preferably, when the source device can also count the automatic repeat request (ARQ) message for the same signal from the next-level network device, then the source device according to the number of automatic retransmission request messages and each power The increment of the adjustment determines the new output power corresponding to the retransmission request.

In step S12, in another preferred embodiment, after the source device receives the automatic repeat request (ARQ) message from the next-level network device, the power adjustment indication information is obtained from the automatic repeat request message, and then, The new output power is determined according to the power adjustment indication information. Specifically, the power adjustment indication information may directly include an output power that the source device should retransmit the previously transmitted signal, or include an output power that the source device should retransmit the previously transmitted signal and an output of the current source device. The difference in power. Further, the power adjustment indication information may also be adaptively determined according to a specific state of a channel transmitted by the current signal.

The previously transmitted signal is retransmitted with the new output power when the source device determines a new output power based on the automatic repeat request message.

The above two preferred embodiments will be described in detail below with reference to Figs.

4 is a flow diagram of a method for automatically retransmitting a signal based on an automatic repeat request in a source device of a wireless communication network in accordance with a preferred embodiment of the present invention.

In this embodiment, step sir is first performed to receive an automatic retransmission request message from a next-level network device;

Secondly, step S12 is performed to determine a new output function according to the automatic repeat request message. Rate

Specifically, step S12 includes step S121 and step S122.

In step S12, step S121 is first performed, and the received automatic retransmission request message for the same signal is counted;

Next, in step S122, the new output power is determined according to the number of times of the automatic retransmission request message and the increment of each power adjustment.

Figure 4 is a preferred embodiment of the present invention. Although step S121' is included in the preferred embodiment, those skilled in the art will appreciate that in a particular application, step S121 is optional.

Specifically, in a case where the source device resets the output power to the initial value after the next-level network device receives the correct retransmission signal or reaches the preset maximum number of retransmissions, the source device may pre-set The increment of each power is determined. When the source device receives the automatic retransmission request message from the next network device, it adjusts the output power according to the power increment, that is, on the original output power. Adding this power increment, a new output power is obtained to retransmit the previously transmitted signal. If the next-level network device receives the retransmission signal and the verification result of the retransmission signal is still an error, repeat the above steps until the next-level network device receives the correct retransmission signal or reaches the preset. The maximum number of retransmissions, the next-level network device forwards the received signal from the source device to the next-level network device, and the source device resets its output power value to the initial value.

When the source device resets its output power to the initial value after each retransmission, the source device may preset its increment of each power, when the source device receives the next time from the next After the automatic retransmission request message of the network device, the automatic retransmission request is counted and the output power is adjusted according to a preset increment, that is, the predetermined power increment is added to the initial value of the output power. , the new output power is obtained to retransmit the previously transmitted signal, and the output power of the source device is reset to the initial value after the retransmission. If the next-level network device receives the retransmission signal, the retransmitted signal If the result of the verification is still an error, the second time the retransmission request message is sent to the source device, the source device counts the 'automatic retransmission request message, and adjusts the output power according to the preset increment. That is, adding twice the value of the predetermined power increment based on the initial value of the output power, obtaining a new output power to retransmit the previously transmitted signal, and resetting the output power of the source device after the retransmission Set as the initial value. If the result of verifying the retransmitted signal is still an error after the next-level network device receives the retransmission signal, repeat the above steps, that is, before the third retransmission, based on the initial value of the output power. Adding three times the value of the predetermined power increment, in the fourth retransmission, adding four times the value of the predetermined power increment based on the initial value of the output power, at the time of the Nth retransmission, at the output The power initial value is added by a value of N times the predetermined power increment, where N is less than a preset maximum number of retransmissions. Until the next-level network device receives the correct retransmission signal or reaches the preset maximum number of retransmissions, the next-level network device forwards the received signal from the source device to the next-level network device.

More specifically, the predetermined power increment may be set according to the specific conditions of the channel. Figure 5 is a flow diagram showing a method for automatically retransmitting a signal based on an automatic repeat request in a source device of a wireless communication network in accordance with another preferred embodiment of the present invention.

In this embodiment, step S11" is first performed to receive an automatic retransmission request message from the next-level network device;

Secondly, step S12" is performed to determine a new output power according to the automatic repeat request message;

Finally, step S13" is performed to retransmit the previously transmitted signal with the new output power.

Specifically, step S12 "includes step S121" and step S122".

In step S12", step S121 is first performed, and the power adjustment indication information is obtained by the automatic retransmission request message;

Next, step S122" is performed to determine a new output power based on the power adjustment indication information.

Figure 5 is another preferred embodiment of the present invention. In this embodiment, After receiving the signal from the source device, the next-level network device performs code verification on the signal. The code check may include a cyclic redundancy code (CRC) check or a parity check, and may also include other types of code check as long as it can judge whether the signal from the source device is correct during transmission. That is, it should be understood by those skilled in the art, and details are not described herein.

If the verification result is correct, the next-level network device sends a positive acknowledgment signal (ACK) to the source device, and forwards the received signal from the source device to the next-level network device; if the verification result is an error, the next The primary network device sends an automatic repeat request message (ARQ, or NAK) to the source device. The source device may include a user equipment, and may also include a mobile relay station, as long as the source device can adjust its output power according to the received automatic retransmission request, which should be understood by those skilled in the art, and will not be described herein. .

After the source device receives the automatic repeat request (ARQ) message from the next-level network device, the power adjustment indication information is obtained from the automatic repeat request message. Specifically, the power adjustment indication information may directly include an output power that the source device should retransmit the previously transmitted signal, or include an output power that the source device should retransmit the previously transmitted signal and an output of the current source device. The difference in power. When the power adjustment indication information includes a difference between an output power that the source device should retransmit the previously transmitted signal and an output power of the current source device, the difference may be added to the output power of the current source device. Obtain the output power that the source device should use to retransmit the previously transmitted signal.

Further, the power adjustment indication information may also be adaptively determined according to a specific state of a channel transmitted by the current signal. If the state of the channel transmitted by the current signal is poor, the output power required by the source device included in the power adjustment indication information to retransmit the previously transmitted signal should be increased by one correspondingly based on the original output power. a larger amplitude; if the state of the channel transmitted by the current signal is good, the output power required by the source device included in the power adjustment indication information to retransmit the previously transmitted signal should be based on the original output power. Add a smaller amplitude accordingly.

After determining the new output power based on the power indication information, the source device transmits the previously transmitted signal at the new output power. If the next-level network device receives the retransmission signal and the verification result is still incorrect, repeat the above steps until the next step. When the network device receives the correct retransmission signal or reaches the preset maximum number of retransmissions, the next-level network device forwards the received signal from the source device to the next-level network device, and at the same time, the source device Reset its output power value to the initial value. Further, the source device may also set its output power to an initial value after each retransmission, and at the second retransmission, the output power of the source device is again adjusted based on the initial output power. .

6 is a block diagram showing the structure of an automatic retransmission apparatus for automatically retransmitting signals based on an automatic retransmission request in a source device of a wireless network, in accordance with an embodiment of the present invention. The automatic repeater 1 includes a receiving device 11 and a signal retransmission device 12.

First, the receiving device 11 is configured to receive an automatic retransmission request message from a next-level network device;

Next, the signal retransmission device 12 is configured to retransmit the previously transmitted signal with the increased output power according to the automatic retransmission request message.

In this embodiment, after the next-level network device receives the signal from the source device, the signal is code-checked. The code check may include a cyclic redundancy (CRC) check or a parity check, and may also include other types of code check, as long as it can judge whether the signal from the source device is correct in the transmission process. However, it should be understood by those skilled in the art, and details are not described herein.

If the calibration result is correct, the next-level network device sends a positive acknowledgment signal (ACK) to the source device, and forwards the received signal from the source device to the next-level network device; if the verification result is an error, the next The primary network device sends an automatic repeat request message (ARQ, or NAK) to the source device. The source device may include a user equipment, and may also include a mobile relay station, as long as the source device can adjust its output power according to the received automatic retransmission request, which should be understood by those skilled in the art, and will not be described herein. .

In a preferred embodiment, in the event of one or more retransmission failures, the receiving device 11 may receive multiple automatic retransmission requests for the same signal (within a predetermined number of times) in order to make the reliability of each retransmission Compared with the previous transmission, the source device needs to adjust the output power of each retransmission. Preferably, the source device can save the input of each retransmission Output power, when another retransmission request is received, the new output power value is determined by simply adding the source output power value to the power increment value in the above manner. More preferably, the automatic repeat request (ARQ) message for the same signal from the next-level network device may also be counted by the counting device, and then the power determining device according to the automatic retransmission request; The increment of each power adjustment determines the new output power corresponding to the retransmission request.

In another preferred embodiment, after the receiving device 11 receives the automatic repeat request (ARQ) message from the next-level network device, the obtaining device obtains power adjustment indication information from the automatic repeat request message, and then, the power The determining means determines the new output power based on the power adjustment indication information. Specifically, the power adjustment indication information may directly include an output power that the source device should retransmit the previously transmitted signal, or include an output power that the source device should retransmit the previously transmitted signal and an output of the current source device. The difference in power. Further, the power adjustment indication information may also be adaptively determined according to a specific state of a channel transmitted by the current signal.

After the power determining means determines the new output power based on the automatic repeat request message, the signal retransmission means 12 retransmits the previously transmitted signal with the new output power.

Figure 7 is a block diagram showing the structure of an automatic retransmission apparatus for automatically retransmitting signals based on an automatic retransmission request in a source device of a wireless network, in accordance with a preferred embodiment of the present invention. The automatic retransmission device Γ includes a receiving device 1 , a signal retransmission device 12 , and a counting device 13 ; the signal retransmission device 12 includes a first power determining device 123 and a first retransmission device 124. Among them, the receiving device 11 and the receiving device 11 described in Fig. 4 are the same device, which realize the same function.

Second, the counting means 13 is configured to count the received automatic retransmission request message for the same signal;

Finally, the signal retransmission device 12 is configured to: according to the automatic retransmission request message, The previously transmitted signal is retransmitted with increased output power.

Specifically, the first power determining device 123 of the signal retransmission device 12 is configured to determine the new output power according to the number of times of the automatic retransmission request cancellation and the increment of each power adjustment;

The first retransmission device 124 is configured to retransmit the previously transmitted signal with the new output power.

After the next-level network device performs code check on the signal received from the source device, the receiving device 11 in the source device receives an automatic repeat request (ARQ) message from the next-level network device, and then the counting device 13' The received automatic repeat request message for the same signal is counted. After counting the automatic retransmission request, the first power determining means 123 determines the new output power based on the number of times of the automatic retransmission request message and the increment of each power adjustment.

Figure 7 is a preferred embodiment of the present invention, although the counting device 13 is included in the preferred embodiment, those skilled in the art will appreciate that in a particular application, the counting device 13 is optional.

The source device may preset the source device after the next-level network device receives the correct retransmission signal or reaches the preset maximum number of retransmissions before the source device resets its output power to the initial value. Each time the power is incremented, when receiving device 11, each After receiving the automatic retransmission request message from the next network device, the output power is adjusted according to the power increment, that is, the power output is added to the original output power to obtain a new output power. The previously transmitted signal is retransmitted. If the next-level network device receives the retransmission signal and the verification result of the retransmission signal is still an error, repeat the above steps until the next-level network device receives the correct retransmission signal or reaches the preset. The maximum number of retransmissions, the next-level network device forwards the received signal from the source device to the next-level network device, and the source device resets its output power value to the initial value.

When the source device resets its output power to the initial value after each retransmission, the source device may preset its increment of each power, when the receiving device 11 receives the first time from After the automatic retransmission request message of the next network device, the counting device

13. Counting the automatic retransmission request and adjusting its output power according to a preset increment, that is, adding the predetermined power increment to the initial value of the output power to obtain a new output power. The previously transmitted signal is retransmitted, and the output power of the source device is reset to the initial value after the retransmission. If the result of the verification of the retransmission signal is still an error after receiving the retransmission signal, the second transmission of the retransmission request message to the source device, the counting device 13 in the source device, The automatic repeat request message is counted, and the output power is adjusted according to a preset increment, that is, a value of twice the predetermined power increment is added to the initial value of the output power to obtain a new output. The power is used to retransmit the previously transmitted signal, and the output power of the source device is reset to the initial value after the retransmission. If the result of verifying the retransmitted signal is still an error after the next-level network device receives the retransmission signal, repeat the above steps, that is, before the third retransmission, based on the initial value of the output power. Adding three times the value of the predetermined power increment, in the fourth retransmission, adding four times the value of the predetermined power increment based on the initial value of the output power, at the time of the Nth retransmission, at the output The initial value of the power is added by a value of N times the predetermined power increment, wherein N. is less than a preset maximum number of retransmissions. Until the next-level network device receives the correct retransmission signal or reaches the preset maximum number of retransmissions, the next-level network device forwards the received signal from the source device to the next-level network device. More specifically, the predetermined power increment may be set according to the specific conditions of the channel. FIG. 8 is a block diagram showing the structure of an automatic retransmission apparatus for performing automatic retransmission in a source device of a wireless network according to another preferred embodiment of the present invention. The automatic retransmission device 1" includes a receiving device 11" and a signal retransmission device 12"; the signal retransmission device 12" includes an obtaining device 121" and a second retransmission device 122"; the second retransmission device 122" includes a second power determining device 1221" and a third retransmission device 1222".

First, the receiving device 11" is configured to receive an automatic retransmission request message from the next-level network device;

Next, the signal retransmission device 12" is configured to retransmit the previously transmitted signal with the increased output power according to the automatic retransmission request message.

Specifically, the acquiring device 121 in the signal retransmission device 12" is configured to obtain the power adjustment indication information from the automatic repeat request message;

The second retransmission device 122" in the signal retransmission device 12" is configured to retransmit the previously transmitted signal with the increased output power based on the power adjustment indication information;

More specifically, the second power determining means 1221" in the second retransmission means 122" is configured to determine a new output power based on the power adjustment indication information;

The third retransmission device 1222" of the second retransmission device 122, is for retransmitting the previously transmitted signal with the new output power.

FIG. 8 is another preferred embodiment of the present invention. In this embodiment, after the next-level network device receives the signal from the source device, the signal is code-checked. The code check may include a cyclic redundancy (CRC) check or a parity check, and may also include other types of code check, as long as it can judge whether the signal from the source device is correct during transmission, that is, However, it should be understood by those skilled in the art, and details are not described herein.

If the verification result is correct, the next-level network device sends a positive acknowledgment signal (ACK) to the source device, and forwards the received signal from the source device to the next-level network device; if the verification result is an error, the next The primary network device sends an automatic repeat request message (ARQ, or NAK) to the source device. The source device may include a user equipment, and may also include a mobile relay station, as long as the source device can adjust the received automatic retransmission request according to the received The output power is sufficient, which should be understood by those skilled in the art, and will not be described herein. After the next-level network device performs code check on the signal received from the source device, the receiving device 11" in the source device receives an automatic repeat request (ARQ) message from the next-level network device, and then the signal retransmission device The power adjustment indication information is obtained from the automatic retransmission request message. The power adjustment indication information may directly include the output power that the source device should retransmit the previously transmitted signal. Or including the difference between the output power that the source device should retransmit the previously transmitted signal and the output power of the current source device. The power adjustment indication information includes the output power that the source device should use to retransmit the previously transmitted signal. When the difference between the output power of the current source device is added, the output power that the source device should retransmit the previously transmitted signal can be obtained by adding the difference to the output power of the current source device.

After the obtaining means 121 in the source device "obtains the power adjustment indication information from the automatic repeat request message, the second power determining means 1221" determines a new output power according to the power indication information, and then the third retransmission device 1222" retransmitting the previously transmitted signal with the new output power. If the next-level network device receives the retransmission signal and the verification result is still an error, repeat the above steps until the next level After the network device receives the correct retransmission signal or reaches the preset maximum number of retransmissions, the next-level network device forwards the received signal from the source device to the next-level network device, and the source device will The output power value is reset to the initial value. Further, the source device can also set its output power to an initial value after each retransmission, and at the second retransmission, the output power of the source device is initial. The power is adjusted again based on the output power. The specific embodiments of the present invention have been described above, and it is understood that the invention is not limited to the specific embodiments described above, and various modifications and changes can be made by those skilled in the art within the scope of the appended claims.

Claims

Rights request

A method for automatically retransmitting a signal based on an automatic repeat request in a source device of a wireless communication network, comprising the steps of:

a. receiving an automatic retransmission request message from a next-level network device;

c. Retransmitting the previously transmitted signal with increased output power based on the automatic repeat request message.

2. The method according to claim 1, wherein the step c further comprises the following steps:

Cl '. determining a new output power based on the predetermined power increment according to the automatic repeat request message;

C2'. Retransmit the previously transmitted signal with the new output power.

3. The method according to claim 2, wherein the step a further comprises the following steps:

b. The received automatic retransmission request message for the same signal is counted; wherein, the step cl further includes:

- determining the new output power based on the number of automatic retransmission request messages and the increment of each power adjustment.

The method according to claim 1, wherein the automatic retransmission request message includes power adjustment indication information, and the step c includes the following steps:

Obtaining the power adjustment indication information from the automatic repeat request message; c2. retransmitting the previously transmitted signal with the increased output power based on the power adjustment indication information.

The method according to claim 4, wherein the step c2 comprises the following steps:

- determining a new output power based on the power adjustment indication information;

- retransmitting the previously transmitted signal with the new output power.

The method according to any one of claims 1 to 5, wherein the source device comprises a user equipment or a relay station.

An automatic retransmission apparatus for automatically retransmitting a signal based on an automatic retransmission request in a source device of a wireless network, comprising:

And a receiving device, configured to receive an automatic retransmission request message from the next-level network device, and a signal retransmission device, configured to retransmit the previously transmitted signal with the increased output power according to the automatic retransmission request message.

The automatic retransmission device according to claim 7, wherein the signal retransmission device further comprises:

a first power determining device, configured to determine a new output power based on the predetermined power increment according to the automatic repeat request message;

a first retransmission device, configured to retransmit the previously transmitted signal at the new output power.

The automatic retransmission apparatus according to claim 8, further comprising: counting means, configured to count the received automatic retransmission request message for the same signal; wherein, the first power determination The apparatus is further configured to determine the new output power according to the number of times of the automatic retransmission request message and the increment of each power adjustment.

The automatic retransmission device according to claim 7, wherein the automatic retransmission request message includes power adjustment indication information, and the signal retransmission device comprises: acquisition means, configured to be used by the automatic retransmission Obtaining the power adjustment indication information in the request message;

And a second retransmission device, configured to retransmit the previously transmitted signal with the increased output power based on the power adjustment indication information.

The automatic retransmission device according to claim 10, wherein the second retransmission device comprises:

a second power determining device, configured to determine a new output power according to the power adjustment indication information;

And a third retransmission device, configured to retransmit the previously transmitted signal with the new output power.

The automatic retransmission device according to any one of claims 7-11, wherein the source device comprises a user equipment or a relay station.