CN103888995B

CN103888995B - The method and apparatus that signal is retransmitted

Info

Publication number: CN103888995B
Application number: CN201210554603.7A
Authority: CN
Inventors: 李强; 周明宇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2012-12-19
Filing date: 2012-12-19
Publication date: 2017-06-06
Anticipated expiration: 2032-12-19
Also published as: CN103888995A

Abstract

The present invention provides the method and apparatus that a kind of signal is retransmitted, wherein, methods described includes：First equipment receives the data-signal that the second equipment sends according to the first scheduling scheme on the first band of frequencies, and the first scheduling scheme indicates the second equipment to send data-signal on the first band of frequencies；First equipment sends the first mistake and indicates when the data-signal of the second equipment transmission is not properly received, to the second equipment, and the first mistake is indicated for indicating the second equipment to resend data-signal；First equipment receives the second reference signal that the second equipment sends according to the second scheduling scheme over a second frequency band；First equipment sends the Dispatching adjustment information determined according to the second reference signal to the second equipment, and Dispatching adjustment information is used to indicate the second equipment to determine the 3rd scheduling scheme for sending data-signal；First equipment receives the data-signal that the second equipment sends according to the 3rd scheduling scheme over a second frequency band.Reliability reduction when the above method is used to solve the problems, such as that signal is retransmitted in the prior art.

Description

Signal retransmission method and device

Technical Field

The present invention relates to communications technologies, and in particular, to a method and a device for retransmitting a signal.

Background

In a wireless communication system, in order to improve transmission efficiency while ensuring transmission reliability, a network device typically estimates the quality of a wireless channel used for transmitting signals, and determines a scheduling scheme according to the quality of the wireless channel. If the estimated wireless channel quality is better, a scheduling scheme with higher transmission efficiency is adopted; if the estimated wireless channel quality is poor, a scheduling scheme with lower transmission efficiency but generally higher reliability is employed.

Specifically, in the current wireless communication system, the quality information of the wireless channel is usually obtained by transmission of a Reference Signal (RS). For example, in a downlink transmission process of a Long Term Evolution (LTE) system, a network device transmits a parameter of a Channel State Information Reference Signal (CSI-RS) to a User Equipment (UE), and sends the CSI-RS to the UE; the UE measures the received CSI-RS according to the parameters of the CSI-RS, thereby acquiring the quality of a downlink channel, determining a suggested scheduling scheme and feeding back the scheme to the network equipment; and the network equipment determines a final downlink scheduling scheme according to the recommended scheduling scheme fed back by the UE.

For another example, in the uplink transmission process of the LTE system, the network device sends a parameter of a Sounding Reference Signal (SRS) to the UE; after receiving the SRS parameters, the UE sends the SRS according to the parameters; therefore, the network device can obtain the quality of the uplink channel by measuring the SRS transmitted by the UE, and determine the final uplink scheduling scheme.

Acquiring the quality of a channel by measuring the CSI-RS/SRS, wherein the process specifically comprises the following steps: assuming that a signal sent by a sender is S (CSI-RS or SRS), and a channel through which the signal passes is H, the signal received by a receiver is H × S + I + Nd, wherein I represents interference of other signals on signal transmission, and Nd represents influence of noise on signal transmission; after the receiver receives the CSI-RS/SRS, since the receiver knows the CSI-RS or SRS (i.e., S) sent by the sender, the quality of a wireless channel through which the CSI-RS/SRS passes can be estimated, for example, the SINR of the received signal is calculated.

Currently, in a wireless communication system, a signal sent by one sender is interfered by signals sent by other senders, so that the interference situation needs to be measured before sending so as to determine a scheduling scheme which is beneficial to interference suppression based on the interference situation; since the measurement time is different from the signal transmission time, if the interference condition between the two times is changed drastically, the determined scheduling scheme may not meet the channel quality when the signal is transmitted. For example, in a cellular communication system, signals transmitted by UE1 to a corresponding receiver (e.g., a base station) of cell 1 may be interfered by UE2 from cell 2 and UE3 from cell 3, where UE2 is farther away from the receiver of cell 1 and thus UE2 causes less interference, while UE3 is closer to the receiver of cell 1 and thus UE3 causes more interference. If cell 1 determines the scheduling scheme of UE1 by measuring signals transmitted by UE1 at time 1, and at this time UE2 transmits signals (causing interference to signals transmitted by UE 1), and UE3 does not transmit signals (causing interference to signals transmitted by UE 1), then cell 1 determines that the transmission efficiency corresponding to the scheduling scheme of UE1 is generally higher; after cell 1 notifies UE1 of the determined scheduling scheme, UE1 transmits uplink signals according to the scheduling scheme at time 2, and if at time 2 UE3 transmits signals (causing strong interference to signals transmitted by UE 1) and UE2 does not transmit signals (causing no interference to signals transmitted by UE 1), the scheduling scheme previously determined by cell 1 for UE1 may not exactly match the channel quality of UE1 at time 2, thereby resulting in that signals transmitted by UE1 may not be correctly received by cell 1, i.e. the reliability of signal transmission is low.

To solve the above problems, the following solutions are proposed by the skilled person, for example: and at the 0 th moment, the network equipment sends a scheduling signaling to the UE to indicate the UE to send the reference signal in the first frequency band, and at the 2 nd moment, the UE sends a signal to the network equipment in the first frequency band according to the scheduling signaling. And the network equipment determines a scheduling adjustment scheme according to the received signal and sends scheduling adjustment information to the UE at the 2 nd moment. And at the 3 rd moment, the UE correspondingly adjusts the scheduling scheme of the signal according to the scheduling adjustment information and sends a data signal to the network equipment in the first frequency band. Thus, at time 1, all UEs in the cellular communication system transmit signals, so that the network device can prepare to measure the interference level in the system, and thus can predict the Signal to interference plus Noise Ratio (SINR) level at the time of actual data transmission. However, at the 3 rd time, the UE will send data to the network device, and after the network device receives the data, it will determine whether the data packet is correctly received, and if the data packet is correctly received, the base station feeds back "ACK" information to the UE through the downlink, and then the reception of the data packet is completed. Otherwise, if the base station fails to correctly receive the data, the base station feeds back "NACK" information to the UE through the downlink, if the UE receives the NACK information, the UE needs to retransmit the data, and interference is still caused to other cells during retransmission, so the above solution still does not solve the interference measurement problem, and reliability of signal transmission cannot be guaranteed.

As shown in fig. 1, in practical applications, signals transmitted by the UE1 to a receiver (e.g., a base station) corresponding to the cell 1 may be interfered by the UE2 from the cell 2 and the UE3 from the cell 3, as described in the prior art, which may eventually result in the reliability of signal transmission being reduced.

For this reason, as shown in fig. 2, those skilled in the art provide a solution to the problem of reliability degradation of signal transmission. As described in the prior art, at time 0, the network device sends a scheduling signaling to the UE to instruct the UE to send a reference signal in the first frequency band, and at time 1, the UE sends the reference signal to the network device in the first frequency band according to the scheduling signaling. And the network equipment determines a scheduling adjustment scheme according to the received signal and sends scheduling adjustment information to the UE at the 2 nd moment. And at the 3 rd moment, the UE correspondingly adjusts the scheduling scheme of the signal according to the scheduling adjustment information and sends a data signal to the network equipment in the first frequency band. The method has the advantage that the UE sending the reference signal in the network at the 1 st time is the same group of UE as the UE sending the data in the network at the 3 rd time, so that the measurement result of the network equipment at the 2 nd time can more accurately predict the transmission quality at the 3 rd time, and the measurement comprises the measurement of the channel quality and the measurement of the interference level. However, if the user equipment receives NACK information, it needs to retransmit data, and if there are a large number of retransmission users in the system, interference caused by other cells will be strong, and interference caused by the retransmission users is not considered in the prior art, so the selection of the scheduling scheme is still inaccurate.

Disclosure of Invention

In view of this, embodiments of the present invention provide a method and an apparatus for retransmitting a signal, so as to solve the problem of the prior art that the reliability of the signal is reduced during retransmission.

In a first aspect, an embodiment of the present invention provides a method for retransmitting a signal, including:

a first device receives a data signal transmitted by a second device according to a first scheduling scheme on a first frequency band, wherein the first scheduling scheme is used for instructing the second device to transmit the data signal on the first frequency band;

when the data signal sent by the second device is not correctly received, the first device sends a first error indication to the second device, wherein the first error indication is used for indicating the second device to resend the data signal;

the first device receives, on a second frequency band, a second reference signal sent by the second device according to a second scheduling scheme after receiving the first error indication, where the second scheduling scheme is used to instruct the second device to send the second reference signal on the second frequency band;

the first device sends scheduling adjustment information determined according to the second reference signal to the second device, wherein the scheduling adjustment information is used for indicating the second device to determine a third scheduling scheme for sending the data signal;

the first device receives the data signal transmitted by the second device according to the third scheduling scheme on the second frequency band

With reference to the first aspect, in a first possible implementation manner, the second scheduling scheme is the same as the first scheduling scheme, and the second frequency band is the same as the first frequency band;

or,

the second scheduling scheme is different from the first scheduling scheme, and the second frequency band is different from the first frequency band.

With reference to the first aspect and the foregoing possible implementation manners, in a second possible implementation manner, each of the first scheduling scheme, the second scheduling scheme, and the third scheduling scheme includes one or more of the following information:

sending power information, modulation mode information, coding rate information, a redundancy version adopted when the second device sends the data signal, and information whether the second device sends the data signal in a frequency hopping mode.

With reference to the first aspect and the foregoing possible implementation manners, in a third possible implementation manner, after the receiving, by the first device, the data signal sent by the second device according to the third scheduling scheme on the second frequency band, the method further includes:

if the first device still does not correctly receive the data signal sent by the second device, the first device continues to send the first error indication to the second device until the number of times that the first device sends the first error indication reaches a preset threshold value.

With reference to the first aspect and the foregoing possible implementation manners, in a fourth possible implementation manner, before the receiving, by the first device, the data signal sent by the second device according to the first scheduling scheme on the first frequency band, the method further includes:

the first device receives a first reference signal sent by the second device, determines the first scheduling scheme according to the first reference signal, and notifies the second device of the first scheduling scheme;

if the data signal comprises a plurality of independent data blocks and the first device does not correctly receive any one data block in the data signal, the RI and the PMI in the second reference signal received by the first device are the same as the RI and the PMI in the first reference signal received by the first device;

if the data signal includes a plurality of independent data blocks and the first device does not correctly receive a part of the data blocks in the data signal, the RI and PMI in the second reference signal received by the first device are different from the RI and PMI in the first reference signal received by the first device.

With reference to the first aspect and the third possible implementation, in a fifth possible implementation, if the first device still does not correctly receive the data signal sent by the second device, the sending, by the first device, a first error indication to the second device by the first device continuously includes:

when the data signal sent by the second device is not correctly received, the first device sends a first error indication of the mth time to the second device, wherein the first error indication is used for indicating the second device to resend the data signal;

the first device receives a Q reference signal transmitted by the second device according to a P scheduling scheme on an Nth frequency band;

the first device sends scheduling adjustment information determined according to the Q reference signal to the second device, wherein the scheduling adjustment information is used for indicating the second device to determine a P +1 scheduling scheme for sending the data signal;

the first device receives the data signal transmitted by the second device according to the P +1 scheduling scheme on the Nth frequency band;

wherein M is a positive integer greater than 1, P is a positive integer greater than 3, N, Q is a positive integer greater than 2, and the frequency band used by the second device to retransmit the data signal does not overlap with the frequency band in which the data signal was previously transmitted.

With reference to the first aspect and the foregoing possible implementations, in a sixth possible implementation,

if the first device is a network device and the second device is a User Equipment (UE), the second reference signal is a Sounding Reference Signal (SRS);

or,

and if the first equipment is user equipment and the second equipment is network equipment, the second reference signal is channel state information-reference signal CSI-RS.

In a second aspect, an embodiment of the present invention provides a method for retransmitting a signal, including:

a second device transmits data signals to a first device on a first frequency band according to a first scheduling scheme, wherein the first scheduling scheme is used for instructing the second device to transmit the data signals on the first frequency band;

the second device receives a first error indication sent by the first device when the data signal sent by the second device is not correctly received, wherein the first error indication is used for indicating the second device to resend the data signal;

the second device transmitting, in response to the first error indication, a second reference signal to the first device on a second frequency band according to a second scheduling scheme, the second scheduling scheme being for instructing the second device to transmit the second reference signal on a second frequency band;

the second device receives scheduling adjustment information which is sent by the first device and determined according to the second reference signal, and determines a third scheduling scheme for sending the data signal according to the scheduling adjustment information;

the second device transmits the data signal to the first device on the second frequency band according to the third scheduling scheme.

With reference to the second aspect, in a first possible implementation manner, the second scheduling scheme is the same as the first scheduling scheme, and the second frequency band is the same as the first frequency band;

or,

With reference to the second aspect and the foregoing possible implementation manners, in a second possible implementation manner, each of the first scheduling scheme, the second scheduling scheme, and the third scheduling scheme includes one or more of the following information:

With reference to the second aspect and the foregoing possible implementation manners, in a third possible implementation manner, after the second device sends the data signal to the first device on the second frequency band according to the third scheduling scheme, the method further includes:

and the second equipment continues to receive a first error indication sent by the first equipment when the data signal sent by the second equipment is not correctly received until the number of times of receiving the first error indication reaches a preset threshold value.

With reference to the second aspect and the foregoing possible implementation manners, in a fourth possible implementation manner, before the sending, by the second device, the data signal to the first device on the first frequency band according to the first scheduling scheme, the method further includes:

the second device sends a first reference signal to the first device, so that the first device determines a first scheduling scheme for sending the second device according to the first reference signal;

if the data signal includes a plurality of independent data blocks and the first device does not correctly receive any data block in the data signal, the second device uses a transmission layer number indication (RI) and a Precoding Matrix Indication (PMI) used when the second device sends the first reference signal when sending the second reference signal;

if the data signal includes a plurality of independent data blocks and the first device does not correctly receive a part of the data blocks in the data signal, the second device uses a different PI or PMI when sending the second reference signal than when sending the first reference signal.

With reference to the second aspect and the third possible implementation, in a fifth possible implementation, the continuing to receive, by the second device, a first error indication sent by the first device when the data signal sent by the second device is not correctly received includes:

the second device transmits a Qth reference signal to the first device on an Nth frequency band according to a Pth scheduling scheme in response to the first error indication;

the second device receives scheduling adjustment information which is sent by the first device and determined according to the Q reference signal, and determines a P +1 scheduling scheme for sending the data signal according to the scheduling adjustment information;

the second device transmits the data signal to the first device on the nth frequency band according to the P +1 th scheduling scheme;

wherein P is a positive integer greater than 3, N, Q is a positive integer greater than 2, and the frequency band used by the second device to retransmit the data signal does not overlap with the frequency band in which the data signal was previously transmitted.

With reference to the second aspect and the foregoing possible implementation manners, in a second possible implementation manner, if the first device is a network device and the second device is a user equipment UE, the second reference signal is a sounding reference signal SRS;

or,

and if the first equipment is User Equipment (UE) and the second equipment is network equipment, the second reference signal is channel state information-reference signal (CSI-RS).

With reference to the third aspect, an embodiment of the present invention provides a communication device, including:

a receiving unit, configured to receive, on a first frequency band, a data signal transmitted by another device according to a first scheduling scheme, where the first scheduling scheme is used to instruct the another device to transmit the data signal on the first frequency band;

a sending unit, configured to send a first error indication to the other device when the receiving unit does not correctly receive the data signal sent by the other device, where the first error indication is used to instruct the other device to resend the data signal;

the receiving unit is configured to receive, on a second frequency band, a second reference signal that is sent by the other device according to a second scheduling scheme after receiving the first error indication after the sending unit sends the first error indication, where the second scheduling scheme is used to instruct the second device to send the second reference signal on the second frequency band;

the transmitting unit is configured to transmit, to the another device, scheduling adjustment information determined according to the second reference signal after the receiving unit receives the second reference signal, where the scheduling adjustment information is used to instruct the another device to determine a third scheduling scheme for transmitting the data signal;

the receiving unit is configured to receive the data signal transmitted by the other device according to the third scheduling scheme on the second frequency band after the transmitting unit transmits the scheduling adjustment information.

With reference to the third aspect, in a first possible implementation manner, the second scheduling scheme is the same as the first scheduling scheme, and the second frequency band is the same as the first frequency band;

or,

With reference to the third aspect and the foregoing possible implementation manners, in a second possible implementation manner, each of the first scheduling scheme, the second scheduling scheme, and the third scheduling scheme includes one or more of the following information:

transmitting power information, modulation mode information, coding rate information, a redundancy version adopted when the other device transmits the data signal, and information whether the other device transmits the data signal in a frequency hopping mode.

With reference to the third aspect and the foregoing possible implementation manners, in a third possible implementation manner, the sending unit is further configured to continue to send the first error indication to the other device when the receiving unit still does not correctly receive the data signal sent by the other device, until the number of times that the sending unit sends the first error indication reaches a preset threshold.

With reference to the third aspect and the foregoing possible implementation manners, in a fourth possible implementation manner, the receiving unit is further configured to

Before receiving a data signal transmitted by another device according to a first scheduling scheme on a first frequency band, also receiving a first reference signal transmitted by the other device, determining the first scheduling scheme according to the first reference signal, and notifying the other device of the first scheduling scheme;

when the data signal comprises a plurality of independent data blocks and the receiving unit does not correctly receive any one data block in the data signal, the RI and the PMI in the second reference signal received by the receiving unit are the same as the RI and the PMI in the first reference signal received by the receiving unit;

when the data signal comprises a plurality of independent data blocks and the receiving unit does not correctly receive the partial data blocks in the data signal, the RI and PMI in the second reference signal received by the receiving unit are different from the RI and PMI in the first reference signal received by the receiving unit.

With reference to the third aspect and the third possible implementation manner, in a fifth possible implementation manner,

the sending unit is further configured to send a first error indication of an mth time to the other device when the receiving unit still does not correctly receive the data signal sent by the other device, where the first error indication is used to instruct the other device to resend the data signal;

the receiving unit is further configured to receive, on the nth frequency band, a qth reference signal transmitted by the other device according to the pth scheduling scheme after the transmitting unit transmits the mth first error indication;

the transmitting unit is further configured to transmit, to the another device, scheduling adjustment information determined according to the qth reference signal after the receiving unit receives the qth reference signal, where the scheduling adjustment information is used to instruct the another device to determine a P +1 th scheduling scheme for transmitting the data signal;

the receiving unit is further configured to receive the data signal sent by the other device according to the P +1 th scheduling scheme on the nth frequency band after the sending unit sends the scheduling adjustment information;

wherein M is a positive integer greater than 1, P is a positive integer greater than 3, N, Q is a positive integer greater than 2, and the frequency band used by the other device to retransmit the data signal is not overlapping with the frequency band in which the data signal was previously transmitted.

With reference to the third aspect and the foregoing possible implementation manners, in a sixth possible implementation manner, the communication device is a network device, the another device is a user equipment UE, and the second reference signal is a sounding reference signal SRS;

or,

the communication device is a User Equipment (UE), the other device is a network device, and the second reference signal is channel state information-reference signal (CSI-RS).

In a fourth aspect, an embodiment of the present invention provides a communication device, including:

a transmitting unit configured to transmit a data signal to another device on a first frequency band according to a first scheduling scheme, the first scheduling scheme being used to instruct a communication device to transmit the data signal on the first frequency band;

a receiving unit, configured to receive, after the transmitting unit transmits the data signal, a first error indication transmitted by the other device when the data signal transmitted by the communication device is not correctly received, where the first error indication is used to instruct the communication device to retransmit the data signal;

the transmitting unit is further configured to, after the receiving unit receives the first error indication, in response to the first error indication, transmit the second reference signal to the other device on a second frequency band according to a second scheduling scheme, where the second scheduling scheme is used to instruct the second device to transmit the second reference signal on the second frequency band;

the receiving unit is configured to receive, after the transmitting unit transmits the second reference signal, scheduling adjustment information determined according to the second reference signal and transmitted by the other device, and determine a third scheduling scheme for transmitting the data signal according to the scheduling adjustment information;

the transmitting unit is configured to transmit the data signal to the another device on the second frequency band according to a third scheduling scheme after the receiving unit receives the scheduling adjustment information and determines the third scheduling scheme.

With reference to the fourth aspect, in a first possible implementation manner, the second scheduling scheme is the same as the first scheduling scheme, and the second frequency band is the same as the first frequency band;

or,

With reference to the fourth aspect and the foregoing possible implementation manners, in a second possible implementation manner, each of the first scheduling scheme, the second scheduling scheme, and the third scheduling scheme includes one or more of the following information:

the information comprises transmission power information, modulation mode information, coding rate information, a redundancy version adopted when the communication equipment transmits the data signal, and information whether the communication equipment transmits the data signal in a frequency hopping mode.

With reference to the fourth aspect and the foregoing possible implementation manners, in a third possible implementation manner, the receiving unit is further configured to continue to receive the first error indication sent by the another device when the data signal sent by the communication device is not correctly received, until the number of times of receiving the first error indication reaches a preset threshold.

With reference to the fourth aspect and the foregoing possible implementation manners, in a fourth possible implementation manner, the sending unit is further configured to send a first reference signal to another device before sending a data signal to the another device on a first frequency band according to a first scheduling scheme, so that the another device determines, according to the first reference signal, a first scheduling scheme for sending the communication device;

if the data signal includes a plurality of independent data blocks and the other device does not correctly receive any data block in the data signal, the sending unit sends the second reference signal by using the transmission layer number indication RI and the precoding matrix indication PMI, which are used when the sending unit sends the first reference signal;

if the data signal includes a plurality of independent data blocks and the other device does not correctly receive a part of the data blocks in the data signal, the sending unit sends the second reference signal by using a different PI or PMI from that used when the sending unit sends the first reference signal.

With reference to the fourth aspect and the third possible implementation manner, in a fifth possible implementation manner,

the sending unit is further configured to, when the receiving unit continues to receive a first error indication sent by the other device when the data signal sent by the communication device is not correctly received, send, in response to the first error indication, a qth reference signal to the other device on an nth frequency band according to a pth scheduling scheme;

the receiving unit is further configured to receive scheduling adjustment information, which is sent by the other device and determined according to the qth reference signal, after the sending unit sends the qth reference signal, and determine a P +1 scheduling scheme for sending the data signal according to the scheduling adjustment information;

the transmitting unit is further configured to transmit the data signal to the other device on the nth frequency band according to the P +1 th scheduling scheme after the receiving unit determines the P +1 th scheduling scheme;

wherein P is a positive integer greater than 3, N, Q is a positive integer greater than 2, and the frequency band used by the communication device to retransmit the data signal does not overlap with the frequency band in which the data signal was previously transmitted.

With reference to the fourth aspect and the foregoing possible implementations, in a sixth possible implementation,

the communication device is User Equipment (UE), the other device is network equipment, and the second reference signal is a Sounding Reference Signal (SRS);

or,

the communication device is a network device, the other device is a User Equipment (UE), and the second reference signal is channel state information-reference signal (CSI-RS).

As can be seen from the foregoing technical solutions, in the method and device for retransmitting a signal according to the embodiments of the present invention, when a first device does not correctly receive a data signal sent by a second device, a first error indication is sent to the second device, the first device receives, on a second frequency band, a second reference signal sent by the second device according to a second scheduling scheme, and sends scheduling adjustment information determined according to the second reference signal to the second device, so that the second device determines a third scheduling scheme for sending the data signal, and the first device receives, on the second frequency band, the data signal sent by the second device according to the third scheduling scheme, thereby improving reliability of signal transmission and solving a problem that reliability of the signal is reduced during retransmission in the prior art.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings needed to be used in the examples, obviously: the following drawings are only drawings of some embodiments of the invention, and for those skilled in the art, other drawings capable of realizing the technical scheme of the invention can be obtained according to the drawings without creative efforts.

FIG. 1 is a diagram illustrating an application scenario in the prior art;

fig. 2 is a schematic diagram of an application scenario of signal transmission in the prior art;

fig. 3A to fig. 3C are schematic flow charts illustrating a signal retransmission method according to an embodiment of the present invention;

fig. 4A and fig. 4B are schematic flow charts illustrating a signal retransmission method according to another embodiment of the present invention;

fig. 5 is a flowchart illustrating a method for retransmitting a signal according to another embodiment of the present invention;

fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a communication device according to another embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is clear that the various embodiments described below are only some of the embodiments of the invention. Based on the embodiments of the present invention described below, even if no creative work is done, a person skilled in the art can obtain other embodiments capable of solving the technical problems of the present invention and achieving the technical effects of the present invention by equivalent transformation of part or even all of the technical features, and it is obvious that the various embodiments transformed by the present invention do not depart from the scope of the present invention.

Based on the technical scheme shown in fig. 2, the embodiment of the present invention provides an accurate scheduling method during signal retransmission, so as to prevent reliability from being reduced during signal retransmission.

It should be understood that the technical solutions of the embodiments of the present invention can be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), an LTE System, a LTE Frequency Division Duplex (FDD) System, a Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for microwave Access (WiMAX) communication System, and the like.

It should also be understood that, in the embodiment of the present invention, a UE may be referred to as a Terminal (Terminal), a Mobile Station (MS), a Mobile Terminal (Mobile Terminal), etc., and the user equipment may communicate with one or more core networks via a Radio Access Network (RAN), for example, the user equipment may be a Mobile phone (or referred to as a "cellular" phone), a computer with a Mobile Terminal, etc., and for example, the user equipment may also be a portable, pocket, handheld, built-in computer, or vehicle-mounted Mobile device, which exchanges voice and/or data with the RAN.

In the embodiment of the present invention, the network device may be a base station, an Access Point (referred to as "AP" for short), a Remote Radio Equipment (Remote Radio Equipment, referred to as "RRE" for short), a Remote Radio port (Remote Radio head, referred to as "RRH" for short), a Remote Radio Unit (Remote Radio Unit, referred to as "RRU" for short), a relay node (relay node, referred to as "RN") or the like. The Base Station may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB, NB) in WCDMA, or an evolved Node B (ENB or e-NodeB) in LTE. It should also be understood that, in the embodiment of the present invention, the network device may also be other devices having a scheduling function, for example, a UE having a scheduling function, and the embodiment of the present invention is not limited thereto.

For convenience of description, the following embodiments will take an LTE system, a user equipment UE as an example, and a network device including a base station as an example, but the present invention is not limited thereto.

Fig. 3A is a flowchart illustrating a method for retransmitting a signal according to an embodiment of the present invention, and as shown in fig. 3A, the method for retransmitting a signal according to the embodiment is as follows.

301. A first device receives a data signal transmitted by a second device according to a first scheduling scheme on a first frequency band, wherein the first scheduling scheme is used for instructing the second device to transmit the data signal on the first frequency band;

302. when the data signal sent by the second device is not correctly received, the first device sends a first error indication to the second device, wherein the first error indication is used for indicating the second device to resend the data signal;

303. the first device receives, on a second frequency band, a second reference signal sent by the second device according to a second scheduling scheme after receiving the first error indication, where the second scheduling scheme is used to instruct the second device to send the second reference signal on the second frequency band;

304. the first device sends scheduling adjustment information determined according to the second reference signal to the second device, wherein the scheduling adjustment information is used for indicating the second device to determine a third scheduling scheme for sending the data signal;

305. the first device receives the data signal transmitted by the second device according to the third scheduling scheme on the second frequency band.

In a first implementation scenario, the second scheduling scheme in step 303 and the first scheduling scheme in step 301 may be the same, and the second frequency band in steps 303 and 305 may be the same as the first frequency band in step 301.

That is, when the first device does not correctly receive the data signal sent by the second device, the first device may perform retransmission of the data signal by using the original signal transmission scheme.

For example, each of the first, second and third scheduling schemes described above may include one or more of the following scheduling information:

the information of the transmission power, the modulation mode, the coding rate, the redundancy version adopted when the second device transmits the data signal, the second device transmits the information of whether the data signal adopts the frequency hopping mode, etc.

The third scheduling scheme may include only the adjustment value or difference of the above information, instead of one complete scheduling information, since it is transmitted through the scheduling adjustment information. The adjustment information may also be adjusted only for at least part of the scheduling information in the first scheduling scheme or the second scheduling scheme, and not necessarily all of the scheduling information.

The first scheduling scheme may be transmitted by the first device to the second device before the first device transmits the data signal.

The second scheduling scheme may be carried in the first error indication, and notified to the second device through the first error indication, or may be pre-agreed by a wireless communication protocol. Under the condition of prearranged by a wireless communication protocol, both the first equipment and the second equipment automatically transmit the second reference signal by using the second scheduling scheme according to the arrangement after the second equipment sends the first error indication.

In addition, in practical applications, after step 305, the method for retransmitting the signal may further include the following step S01 not shown in the figure:

s01, if the first device still does not correctly receive the data signal sent by the second device, the first device continues to send the first error indication to the second device, and at this time, the data signal may also be retransmitted according to the original signaling scheme.

And when the number of times that the first error indication is sent by the first equipment reaches a preset threshold value, the first equipment stops continuously sending the first error indication.

Of course, if the first device correctly receives the data signal sent by the second device, the signal retransmission method of this embodiment may further include the following step S02 not shown in the figure:

s02, the first device sends an indication of correct reception of the data signal to the second device.

Optionally, for example, with reference to fig. 2, before the first device receives the data signal sent by the second device according to the first scheduling scheme on the first frequency band, the method for retransmitting the signal further includes step M01 not shown in the figure:

m01: the first device receives a first reference signal sent by the second device, determines the first scheduling scheme according to the first reference signal, and notifies the second device of the first scheduling scheme;

therefore, when the data signal includes a plurality of independent data blocks during signal retransmission, and the first device does not correctly receive any one of the data blocks in the data signal, the Indication of the number of transmission layers (RI for short) and the Indication of the Precoding matrix (PMI for short) in the second reference signal received by the first device are the same as the RI and the PMI in the first reference signal received by the first device;

In a second implementation scenario, the second scheduling scheme in step 303 and the first scheduling scheme in step 301 may be different, and the second frequency band in step 303 and step 305 may be different from the first frequency band in step 301.

That is, when the first device does not correctly receive the data signal transmitted by the second device, the first device may transmit the data signal by using a new signal transmission scheme.

Of course, in an implementation scenario of this embodiment, each of the first scheduling scheme, the second scheduling scheme, and the third scheduling scheme may include one or more of the following information:

The first scheduling scheme and the second scheduling scheme also indicate frequency domain resources for transmitting the data signals, i.e., the frequency bands in which the data signals are transmitted, respectively. The third scheduling scheme, which is carried in the scheduling adjustment information, does not re-indicate the frequency band in which the data signal is transmitted. The second device will naturally retransmit the data signal according to the third scheduling scheme on the second frequency band after receiving the scheduling adjustment information.

The Modulation scheme information included in the scheduling scheme may indicate what Modulation scheme the second device uses for signal transmission, where the Modulation scheme includes QPSK (Quadrature phase shift keying) with low efficiency, 16 Quadrature Amplitude Modulation (QAM for short), 64QAM, and so on.

The coding rate information included in the scheduling scheme may indicate what coding scheme the second device employs, and if the coding rate is high, the information transmission is high.

The redundancy version information included in the scheduling scheme may indicate which portion of the encoded data the second device transmitted after the encoding is complete.

The information of the frequency hopping pattern included in the scheduling scheme may indicate whether the second device divides the data into a plurality of parts when transmitting the data, and transmits the data of each part on a different frequency.

In particular, if the first device still does not correctly receive the data signal sent by the second device, the first device continues to send the first error indication to the second device, and the frequency band used by the second device each time the data signal is retransmitted may be different.

For example, the retransmission of the data signal may be performed using the following steps R01 to R04:

r01, when the data signal sent by the second device is not correctly received, the first device sends a first error indication of the Mth time to the second device, wherein the first error indication is used for indicating the second device to resend the data signal;

r02, the first device receives a Q reference signal transmitted by the second device according to a P scheduling scheme on an N frequency band;

r03, the first device sending scheduling adjustment information determined according to the qth reference signal to the second device, the scheduling adjustment information being used for instructing the second device to determine a P +1 th scheduling scheme for sending the data signal;

r04, the first device receiving the data signal transmitted by the second device according to the P +1 scheduling scheme on the Nth frequency band;

wherein M is a positive integer greater than 1, P is a positive integer greater than 3, N, Q is a positive integer greater than 2, and the frequency band used by the second device to retransmit the data signal does not overlap with the frequency band in which the data signal was previously transmitted. If M changes in these steps, P, N, Q changes in sequence.

The above process may be repeated multiple times, which is equivalent to multiple retransmissions. In each retransmission, the scheduling adjustment information may be re-determined, and the re-determined scheduling adjustment information is used to adjust any one of the previous scheduling schemes to obtain an adjusted scheduling scheme (P +1 th scheduling scheme). The nth frequency band may be the same as the frequency band used in any of the previous scheduling schemes.

As described above, the scheduling adjustment information of any time may include an adjustment value of scheduling information in any scheduling scheme adopted before, and the scheduling adjustment information may adjust only one or more pieces of scheduling information in the scheduling scheme of the previous time, and does not need to adjust the entire scheduling scheme. The adjustment value may be a difference value of the currently used scheduling information with respect to the previous scheduling information, rather than an entire value.

In practical application, a maximum threshold for signal retransmission is specified in a current protocol, and if the number of times that the first device sends the first error indication reaches the maximum threshold specified in the protocol, the first device stops sending the first error indication, that is, the first device stops continuously acquiring the incorrectly received data signal.

In addition, at the time of signal retransmission, if the data signal includes a plurality of independent data blocks and the first device does not correctly receive any one data block in the data signal, the RI and PMI in the second reference signal received by the first device are the same as the RI and PMI in the first reference signal received by the first device;

As can be seen from the above, in the signal retransmission method of this embodiment, when the first device does not correctly receive the data signal sent by the second device, the first error indication is sent to the second device, the first device receives, on the second frequency band, the second reference signal sent by the second device according to the second scheduling scheme, and sends the scheduling adjustment information determined according to the second reference signal to the second device, so that the second device determines the third scheduling scheme for sending the data signal, and the first device receives, on the second frequency band, the data signal sent by the second device according to the third scheduling scheme, thereby improving reliability of signal transmission and solving a problem that reliability of the signal is reduced during retransmission in the prior art.

Further, in step 303, the second reference signal transmitted by the second device on the second frequency band according to the second scheduling scheme may be performed according to a default manner of a wireless communication standard protocol or according to an indication of the first error indication.

Specifically, the first error indication sent by the first device to the second device may have the following indication meanings:

firstly, the method comprises the following steps: the first error indication is used for indicating the second equipment to resend the data signal, and at the moment, the second equipment resends the data signal to the first equipment according to a mode specified by a protocol;

secondly, the method comprises the following steps: the first error indication is for instructing the second device to retransmit the data signal on a first frequency band in accordance with a first scheduling scheme;

thirdly, the method comprises the following steps: the first error indication is for instructing the second device to retransmit the data signal on a second frequency band in a different scheme than a first scheduling scheme;

therefore, the second scheduling scheme of this embodiment may be different from the first scheduling scheme, and the second scheduling scheme is configured by the first device through a higher layer signaling. Of course, the second scheduling scheme may be the same as the first scheduling scheme, so that the two devices equivalently transmit the second reference signal according to the original first scheduling scheme.

The first device in the above embodiments may be a network device, such as a base station, and the second device may be a UE, and then the second reference signal in the above steps 303 and 304 may be an SRS;

or

The first device in the above embodiments may be a UE, the second device may be a network device such as a base station, and the second reference signal in the above steps 303 and 304 may be a CSI-RS.

It should be understood that in the current communication system, the UE sending the uplink signal is controlled by the network device, that is, the network device first sends a Control signaling including a scheduling scheme to the UE, for example, in the LTE system, the base station sends a Physical Downlink Control Channel (PDCCH) signal to the UE. And after receiving the control signaling, the UE sends an uplink signal according to the control signaling. For example, in an LTE system, the control signaling includes one or more of the following information: frequency band information used by the UE to transmit signals, modulation scheme and/or coding rate information used, power used to transmit signals, power adjustment amount information, and the like.

In addition, if the UE transmits the uplink signal through multiple antenna ports, the control signaling may further include the number of layers used for transmitting the signal, a precoding matrix used for transmitting the signal, or an antenna port selected by the transmission signal. After receiving the control signaling, the UE may perform channel coding on data to be transmitted according to the coding rate; modulating the coded data according to a modulation mode; mapping the modulated generated symbols to corresponding frequency bands; and finally, sending out the signal by corresponding power. Optionally, after obtaining the modulated symbols, the modulated symbols may be mapped to multiple layers of the space according to the layer number information, and then the multilayer signals are precoded according to the precoding matrix information, or sent on the selected antenna port. For brevity, no further description is provided herein.

Fig. 3B is a flowchart illustrating a method for retransmitting a signal according to an embodiment of the present invention, and as shown in fig. 3B, the method for retransmitting a signal according to the embodiment is as follows.

311. The method comprises the steps that network equipment receives a data signal sent by UE according to a first scheduling scheme on a first frequency band, wherein the first scheduling scheme is used for indicating the UE to send the data signal on the first frequency band;

for example, the first scheduling scheme in this step may include at least one of the following information: a frequency band carried by the UE for transmitting the signal, a modulation scheme and/or a coding rate used by the UE for transmitting the signal, a power/power adjustment amount used by the UE for transmitting the signal, a number of layers used by the UE for transmitting the signal (e.g., Rank in the LTE system), a Precoding Matrix (Precoding Matrix) used by the UE for transmitting the signal, an antenna port selected by the UE for transmitting the signal, and so on. The combination of the Modulation Scheme and the Coding rate may be referred to as a Modulation and Coding Scheme (MCS).

It will be appreciated that the network device interacts with U E to determine the first scheduling scheme. For example, as shown in fig. 2, the network device transmits a scheduling scheme to the UE, the scheduling scheme being used for instructing the UE to transmit data signals on a first frequency band; receiving a first reference signal sent by the UE according to the scheduling scheme on a first frequency band, and sending scheduling adjustment information determined according to the first reference signal to the UE, wherein the scheduling adjustment information is used for enabling the UE to determine the first scheduling scheme for sending the data signal; and then receiving the data signal sent by the UE according to the first scheduling scheme on the first frequency band.

312. When the data signal sent by the UE is not correctly received, the network equipment sends a first error indication to the UE, wherein the first error indication is used for indicating the second equipment to resend the data signal;

313. the network equipment receives a second reference signal sent by the UE according to a first scheduling scheme on a first frequency band;

314. the network equipment sends scheduling adjustment information determined according to the second reference signal to the UE, wherein the scheduling adjustment information is used for indicating the UE to determine a third scheduling scheme for sending the data signal;

for example, the scheduling adjustment information in this step may include at least one of transmission power information, modulation scheme information, and coding rate information. Preferably, the scheduling adjustment information includes modulation mode information and coding rate information, i.e., MCS information. Alternatively, the scheduling adjustment information includes an adjustment value of a modulation coding scheme, and the like.

It should be understood that, in this embodiment, the scheduling adjustment information may include a scheduling scheme finally determined by the network device, and may also include an adjustment value or an adjustment amount of each scheduling information compared with the first scheduling scheme. Specifically, the transmission power information may include the final transmission power value, and may also include an adjustment value of the transmission power; the modulation mode information may include a final modulation mode, or may include an adjustment value of the modulation mode; the coding rate information may include a final coding rate, an adjustment value of the coding rate, and the like.

315. And the network equipment receives the data signal transmitted by the UE according to the third scheduling scheme on the first frequency band.

It should be noted that, after receiving the data signal, the network device may demodulate the data signal by using the first scheduling scheme or the third scheduling scheme, and if the demodulation is not correct, repeat the above steps 311 to 315.

Of course, if the network device correctly demodulates the data signal, an indication of correct reception of the data signal is sent to the U E.

As can be seen from the foregoing embodiments, in the signal retransmission method of this embodiment, when the network device does not correctly receive the data signal sent by the UE using the first scheduling scheme, the network device sends the first error indication to the UE, and the UE transmits the second reference signal to the network device according to the first scheduling scheme, so that the network device determines the scheduling adjustment information according to the second reference signal, thereby determining the final third scheduling scheme, implementing the matching between the third scheduling scheme and the channel quality at the signal transmission time, improving the reliability of signal transmission, and solving the problem of reduced reliability of the signal during retransmission in the prior art.

Certainly, in practical applications, if the network device successfully receives the data signal, the network device sends a correct receiving indication of the data signal to the UE; if the network device does not correctly receive the data signal, the network device sends the first error indication mentioned in step 312 to the UE.

It should be understood that, if the network device does not correctly receive the data signal sent by the UE on the first frequency band, and the number of times that the network device sends the first error indication reaches a preset threshold, the network device stops sending the first error indication, that is, the network device stops continuously acquiring the incorrectly received data signal.

That is, a threshold for the maximum number of retransmissions that the network device can send, i.e., the number of first error indications, is defined in the current standard. And if the times of sending the first error indication by the network equipment reaches a preset threshold value and the network equipment does not receive the data signal correctly, stopping obtaining the incorrectly received data signal by the network equipment.

In a special scenario, if the network device does not correctly receive the data signal sent by the UE on the first frequency band, and the number of times that the network device sends the first error indication does not reach a preset threshold, the network device may further retransmit the data signal by using steps 401 to 405 as illustrated in the following example after performing steps 311 to 315. This embodiment is merely an example, and does not limit the combination of the embodiments.

In another optional application scenario, in the foregoing step 313, the RI and PMI adopted when the UE transmits the second reference signal may be the same as the RI and PMI adopted when the UE transmits the first reference signal; alternatively, the RI and PMI used when the UE transmits the second reference signal may be different from the RI and PMI used when the UE transmits the first reference signal.

Specifically, if the data signal includes a plurality of independent data blocks and the network device does not correctly receive any one data block (transport block) in the data signal, the RI and PMI in the second reference signal received by the network device are the same as the RI and PMI in the first reference signal received by the network device;

if the data signal comprises a plurality of independent data blocks and the network device does not correctly receive part of the data blocks in the data signal, the RI and PMI in the second reference signal received by the network device are different from the RI and PMI in the first reference signal received by the network device;

wherein the first reference signal is a reference signal transmitted by the UE before the data signal is transmitted by using the first scheduling scheme.

It should be noted that, the RI and PMI of the UE when initially transmitting the data signal are specified by the network device when scheduling the UE for transmission; wherein, RI represents the number of parallel data streams used for uplink transmission, and PMI represents a precoding matrix used for multi-antenna precoding. That is, when the network device schedules the UE to transmit data signals, the network device sends a signaling to the UE to notify the UE what RI and PMI are used, and further U E uses the network device to designate the RI and PMI to generate and transmit the data signals of the network device.

Therefore, the signal transmission method in the embodiment can improve the efficiency of signal transmission and can improve the reliability of signal transmission at the same time.

Fig. 3C is a flowchart illustrating a method for retransmitting a signal according to an embodiment of the present invention, and as shown in fig. 3C, the method for retransmitting a signal according to the embodiment is as follows.

321. The UE receives a data signal sent by a network device according to a first scheduling scheme on a first frequency band, wherein the first scheduling scheme is used for instructing the network device to send the data signal on the first frequency band;

322. u E when the data signal sent by the network device is not received correctly, sending a first error indication to the network device, the first error indication being used for instructing the network device to resend the data signal;

323. the UE receives a second reference signal (such as CSI-RS) sent by the network equipment according to a first scheduling scheme on a first frequency band;

324. the UE sends scheduling adjustment information determined according to the second reference signal to the network equipment, wherein the scheduling adjustment information is used for indicating the network equipment to determine a third scheduling scheme for sending the data signal;

325. and the UE receives the data signal transmitted by the network equipment according to the third scheduling scheme on the first frequency band.

It should be noted that, after receiving the data signal, the UE may demodulate the data signal by using the first scheduling scheme or the third scheduling scheme, and if the demodulation is not correct, repeat the above steps 321 to 325.

Of course, if the UE correctly demodulates the data signal, it sends an indication of correct reception of the data signal to the base station.

It should be appreciated that, if the UE does not correctly receive the data signal sent by the network device on the first frequency band, and the number of times the UE sends the first error indication reaches a preset threshold, the UE stops sending the first error indication, that is, stops acquiring the incorrectly received data signal.

It can be known from the foregoing embodiments that the method for retransmitting a signal according to the present embodiment can improve reliability of signal transmission, solve the problem of reliability reduction of a signal during retransmission in the prior art, and improve efficiency of signal transmission at the same time.

Fig. 4A is a flowchart illustrating a method for retransmitting a signal according to an embodiment of the present invention, and as shown in fig. 4A, the method for retransmitting a signal according to the embodiment is as follows.

401. The method comprises the steps that network equipment receives a data signal sent by UE according to a first scheduling scheme on a first frequency band, wherein the first scheduling scheme is used for indicating the UE to send the data signal on the first frequency band;

402. when the data signal sent by the UE is not correctly received, the network equipment sends a first error indication to the UE, wherein the first error indication is used for indicating the UE to resend the data signal;

403. the network equipment receives a second reference signal sent by the UE according to a second scheduling scheme on a second frequency band;

404. the network equipment sends scheduling adjustment information determined according to the second reference signal to the UE, wherein the scheduling adjustment information is used for indicating the UE to determine a third scheduling scheme for sending the data signal;

405. and the network equipment receives the data signal transmitted by the UE according to the third scheduling scheme on the second frequency band.

The first scheduling scheme and the second scheduling scheme are different, and the first frequency band and the second frequency band are also different.

In a preferred application scenario, if the network device still does not correctly receive the data signal sent by the UE, and the number of times that the network device sends the first error indication does not reach the preset threshold, the method further includes the following steps R01 'to R05':

r01', when the data signal sent by the UE is not correctly received, the network device sends a first error indication of the Mth time to the UE, wherein the first error indication is used for indicating the UE to resend the data signal;

r02', the network device receives the qth reference signal sent by the UE according to the pth scheduling scheme on the nth frequency band;

r03', the network device sending scheduling adjustment information determined according to the qth reference signal to the UE, where the scheduling adjustment information is used to instruct the UE to determine a P +1 th scheduling scheme for sending the data signal;

r04', the network device receiving the data signal transmitted by the UE according to the P +1 scheduling scheme on the nth frequency band;

wherein M is a positive integer greater than 1, P is a positive integer greater than 3, N, Q is a positive integer greater than 2, and the frequency band used by the UE to retransmit the data signal does not overlap with the frequency band in which the data signal was previously transmitted. When M changes, P, N, Q changes in turn.

That is, if the UE fails to retransmit the data signal in the second frequency band, the UE retransmits the data signal in a third frequency band, and so on, the frequency band used for retransmitting the data signal every time is different.

Fig. 4B is a flowchart illustrating a method for retransmitting a signal according to an embodiment of the present invention, and as shown in fig. 4B, the method for retransmitting a signal according to the embodiment is as follows.

411. The UE receives a data signal sent by a network device according to a first scheduling scheme on a first frequency band, wherein the first scheduling scheme is used for instructing the network device to send the data signal on the first frequency band;

412. u E when the data signal sent by the network device is not received correctly, sending a first error indication to the network device, the first error indication being used for instructing the network device to resend the data signal;

413. the UE receives a second reference signal sent by the network equipment according to a second scheduling scheme on a second frequency band;

414. the UE sends scheduling adjustment information determined according to the second reference signal to the network equipment, wherein the scheduling adjustment information is used for indicating the network equipment to determine a third scheduling scheme for sending the data signal;

415. and the UE receives the data signal transmitted by the network equipment according to the third scheduling scheme on the second frequency band.

The second scheduling scheme may be different from the first scheduling scheme, and the second frequency band may be different from the first frequency band.

In a preferred application scenario, if the UE still does not correctly receive the data signal sent by the network device, the UE continues to send a first error indication to the network device, which specifically includes the following steps N01 to N04:

n01, when the UE does not correctly receive the data signal sent by the network equipment, sending a first error indication of the Mth time to the network equipment, wherein the first error indication is used for indicating the network equipment to resend the data signal;

n02, the UE receives the Q reference signal sent by the network equipment according to the P scheduling scheme on the N frequency band;

n03, the UE sends scheduling adjustment information determined according to the Q reference signal to the network equipment, wherein the scheduling adjustment information is used for indicating the network equipment to determine a P +1 scheduling scheme for sending the data signal;

n04, the UE receives the data signal sent by the network equipment according to the P +1 scheduling scheme on the Nth frequency band;

wherein M is a positive integer greater than 1, P is a positive integer greater than 3, N, Q is a positive integer greater than 2, and the frequency band used by the network device to retransmit the data signal does not overlap with the frequency band in which the data signal was previously transmitted. When M changes, P, N, Q changes in turn.

Fig. 5 is a flowchart illustrating a method for retransmitting a signal according to another embodiment of the present invention, and as shown in fig. 5, the method for retransmitting a signal according to this embodiment is as follows.

501. The second device transmitting the data signal to the first device on the first frequency band according to a first scheduling scheme, the first scheduling scheme being used for instructing the second device to transmit the data signal on the first frequency band;

502. the method comprises the steps that a second device receives a first error indication sent by a first device when a data signal sent by the second device is not correctly received, and the first error indication is used for indicating the second device to resend the data signal;

503. the second device transmitting a second reference signal to the first device on a second frequency band according to a second scheduling scheme in response to the first error indication, the second scheduling scheme being for instructing the second device to transmit the second reference signal on a second frequency band;

504. the second equipment receives scheduling adjustment information which is sent by the first equipment and determined according to the second reference signal, and determines a third scheduling scheme for sending the data signal according to the scheduling adjustment information;

505. the second device transmits the data signal to the first device on the second frequency band according to the third scheduling scheme.

For example, each of the first scheduling scheme and the second and third scheduling schemes includes one or more of the following information:

the information of the transmission power, the modulation mode information, the coding rate information, the redundancy version adopted when the second device transmits the data signal, the information of whether the second device transmits the data signal in the frequency hopping mode, and the like.

Optionally, after step 505, the method for retransmitting the signal further includes the following step 506 not shown in the figure:

506. the second device continues to receive a first error indication sent by the first device when the data signal sent by the second device is not correctly received; the retransmission of the signal may be performed according to the method described in steps 501 to 505 above.

And if the number of times that the first error indication is sent by the first equipment reaches a preset threshold value, the second equipment does not receive the first error indication any more. At this time, the second device stops continuing to perform the operation of receiving the first error indication.

In practical applications, before step 501, the method for retransmitting signals may further include the following step 500 not shown in the figure:

500. the method comprises the steps that a second device sends a first reference signal to a first device, so that the first device determines a first scheduling scheme for sending the second device according to the first reference signal;

furthermore, if the data signal includes a plurality of independent data blocks and the first device does not correctly receive any data block in the data signal, the second device uses the RI and PMI used when the second device sends the first reference signal when sending the second reference signal;

In an application scenario, the second scheduling scheme and the first scheduling scheme may be the same, and the second frequency band and the first frequency band may be the same.

In another application scenario, the second scheduling scheme and the first scheduling scheme may be different, and the second frequency band and the first frequency band are also different.

Specifically, if the second scheduling scheme is different from the first scheduling scheme, and the second frequency band is also different from the first frequency band, the method specifically includes the following sub-steps X01 to X03, which are not shown in the figure, when the second device continues to receive the first error indication sent by the first device when the data signal sent by the second device is not correctly received, for example, the first error indication of the mth time:

the X01, the second device, in response to the first error indication, transmitting a Qth reference signal to the first device on an Nth frequency band according to a Pth scheduling scheme;

the X02 and the second device receive scheduling adjustment information which is sent by the first device and determined according to the Q reference signal, and determine a P +1 scheduling scheme for sending the data signal according to the scheduling adjustment information;

the X03, the second device transmitting the data signal to the first device on the Nth frequency band according to the P +1 scheduling scheme;

For example, if the first device in the above embodiment is a network device such as a base station and the second device is a UE, the second reference signal is an SRS;

or,

if the first device in the above embodiment is a UE and the second device is a network device, the second reference signal is a CSI-RS.

The signal retransmission method of the embodiment can improve the reliability of signal transmission, solve the problem of reduced reliability of the signal during retransmission in the prior art, and improve the efficiency of signal transmission at the same time.

According to another aspect of the embodiments of the present invention, there is also provided a communication device, as shown in fig. 6, the communication device including: a transmitting unit 61 and a receiving unit 62;

wherein the receiving unit 62 is configured to receive, on a first frequency band, a data signal transmitted by another device according to a first scheduling scheme, where the first scheduling scheme is used to instruct the another device to transmit the data signal on the first frequency band;

the sending unit 61 is configured to send a first error indication to the other device when the receiving unit 62 does not correctly receive the data signal sent by the other device, where the first error indication is used to instruct the other device to resend the data signal;

the receiving unit 62 is configured to receive, on the second frequency band, a second reference signal sent by the other device according to the second scheduling scheme after receiving the first error indication after the sending unit 61 sends the first error indication;

the transmitting unit 61 is configured to transmit, to the other device, scheduling adjustment information determined according to the second reference signal after the receiving unit 62 receives the second reference signal, where the scheduling adjustment information is used to instruct the other device to determine a third scheduling scheme for transmitting the data signal;

the receiving unit 62 is configured to receive the data signal transmitted by the other device according to the third scheduling scheme on the second frequency band after the transmitting unit 61 transmits the scheduling adjustment information.

In a possible implementation scenario, the second scheduling scheme is the same as the first scheduling scheme, and the second frequency band is the same as the first frequency band; that is, the other device retransmits the data signal on the original frequency band using the original scheme.

In a second possible implementation scenario, the second scheduling scheme is different from the first scheduling scheme, and the second frequency band is different from the first frequency band; that is, another device may retransmit the data signal on the new frequency band using another scheduling scheme.

In a specific application, each of the first scheduling scheme and the second and third scheduling schemes includes one or more of the following information:

transmission power information, modulation mode information, coding rate information, a redundancy version adopted when the other device transmits the data signal, information on whether the other device transmits the data signal in a frequency hopping mode, and the like.

In an optional application scenario, the sending unit 61 is further configured to continue to send the first error indication to the other device when the receiving unit 62 still does not correctly receive the data signal sent by the other device, until the number of times that the sending unit 61 sends the first error indication reaches a preset threshold.

For example, the receiving unit 62 is further configured to receive a first reference signal sent by another device before receiving a data signal sent by the another device according to a first scheduling scheme on a first frequency band, determine the first scheduling scheme according to the first reference signal, and notify the another device of the first scheduling scheme;

further, when the data signal includes a plurality of independent data blocks and the receiving unit 62 does not correctly receive any data block in the data signal, the RI and PMI in the second reference signal received by the receiving unit 62 are the same as the RI and PMI in the first reference signal received by the receiving unit;

when the data signal includes a plurality of independent data blocks and the receiving unit 62 does not correctly receive a part of the data blocks in the data signal, the RI and PMI in the second reference signal received by the receiving unit 62 are different from the RI and PMI in the first reference signal received by the receiving unit.

In the second possible implementation scenario described above, the sending unit 61 is further configured to send, to the other device, a first error indication of the mth time when the receiving unit 62 still does not correctly receive the data signal sent by the other device, where the first error indication is used to instruct the other device to resend the data signal;

the receiving unit 62 is further configured to receive, on the nth frequency band, the qth reference signal transmitted by the other device according to the pth scheduling scheme after the transmitting unit 61 transmits the first error indication for the mth time;

the transmitting unit 61 is further configured to transmit, to the another device, scheduling adjustment information determined according to the qth reference signal after the receiving unit 62 receives the qth reference signal, where the scheduling adjustment information is used to instruct the another device to determine a P +1 th scheduling scheme for transmitting the data signal;

the receiving unit 62 is further configured to receive the data signal transmitted by the other device according to the P +1 th scheduling scheme on the nth frequency band after the transmitting unit 61 transmits the scheduling adjustment information;

wherein M is a positive integer greater than 1, P is a positive integer greater than 3, N, Q is a positive integer greater than 2, and the frequency band used by the other device to retransmit the data signal is not overlapping with the frequency band in which the data signal was previously transmitted. When M changes, P, N, Q changes in turn.

In practical application, the communication device may be a network device or a user equipment, specifically, the communication device is a network device, the another device is a UE, and the second reference signal is an SRS;

or,

the communication device is a UE, the other device is a network device, and the second reference signal is a CSI-RS.

The communication device of the embodiment can improve the reliability of data signal transmission of another device through interaction with another device, solves the problem that the reliability of data signals is reduced during retransmission in the prior art, and simultaneously improves the efficiency of signal transmission.

According to another aspect of the embodiments of the present invention, an embodiment of the present invention further provides a communication device, as shown in fig. 7, the communication device of the present embodiment includes: a receiving unit 71 and a transmitting unit 72;

wherein the transmitting unit 72 is configured to transmit a data signal to another device on a first frequency band according to a first scheduling scheme, the first scheduling scheme being configured to instruct a communication device to transmit the data signal on the first frequency band;

the receiving unit 71 is configured to receive, after the transmitting unit 72 transmits the data signal, a first error indication sent by the other device when the data signal transmitted by the communication device is not correctly received, where the first error indication is used to instruct the communication device to retransmit the data signal;

the transmitting unit 72 is further configured to transmit the second reference signal to the other device on a second frequency band according to a second scheduling scheme in response to the first error indication after the receiving unit 71 receives the first error indication;

the receiving unit 71 is configured to receive, after the transmitting unit 72 transmits the second reference signal, scheduling adjustment information determined according to the second reference signal and transmitted by the other device, and determine a third scheduling scheme for transmitting the data signal according to the scheduling adjustment information;

the transmitting unit 72 is configured to transmit the data signal to the other device on the second frequency band according to a third scheduling scheme after the receiving unit 71 receives the scheduling adjustment information and determines the third scheduling scheme.

In a first possible implementation scenario, the second scheduling scheme is the same as the first scheduling scheme, and the second frequency band is the same as the first frequency band.

In a second possible implementation scenario, the second scheduling scheme is different from the first scheduling scheme, and the second frequency band is different from the first frequency band.

In a specific application, each of the first scheduling scheme, the second scheduling scheme, and the third scheduling scheme includes one or more of the following information:

Of course, the receiving unit 71 is further configured to continue receiving the first error indication sent by the other device when the data signal sent by the communication device is not correctly received, until the number of times of receiving the first error indication reaches a preset threshold. I.e. the receiving unit 71 may stop receiving the first error indication after the number of times the first error indication is received reaches the threshold value.

For example, the sending unit 72 is further configured to send a first reference signal to another apparatus before sending a data signal to the other apparatus on a first frequency band according to a first scheduling scheme, so that the other apparatus determines a first scheduling scheme for sending the communication apparatus according to the first reference signal;

at this time, if the data signal includes a plurality of independent data blocks and the other device does not correctly receive any one data block in the data signal, the transmitting unit 72 adopts the RI and PMI adopted when the transmitting unit transmits the first reference signal when transmitting the second reference signal;

if the data signal includes a plurality of independent data blocks and the other device does not correctly receive a part of the data blocks in the data signal, the sending unit 72 uses a different PI or PMI when sending the second reference signal than when sending the first reference signal.

In the second possible implementation scenario, the sending unit 72 is further configured to, when the receiving unit 71 continues to receive a first error indication sent by the other device when the data signal sent by the communication device is not correctly received, respond to the first error indication, and send a qth reference signal to the other device on an nth frequency band according to a pth scheduling scheme;

the receiving unit 71 is further configured to receive scheduling adjustment information, which is sent by the other device and determined according to the qth reference signal, after the sending unit 72 sends the qth reference signal, and determine a P +1 scheduling scheme for sending the data signal according to the scheduling adjustment information;

the transmitting unit 72 is further configured to transmit the data signal to the other device on the nth frequency band according to the P +1 th scheduling scheme after the receiving unit 71 determines the P +1 th scheduling scheme;

In a specific application, the communication device may be a UE, or may also be a network device such as a base station, specifically, the communication device may be a user equipment UE, the another device may be a network device, and the second reference signal is an SRS;

alternatively, the communication device may be a network device, the other device may be a UE, and the second reference signal may be a CSI-RS.

It should be noted that, in the above embodiment of the communication device, the division of each functional unit is only an example, and in practical applications, the above functions may be allocated to different functional units according to needs, for example, configuration requirements of corresponding hardware or convenience of implementation of software, that is, the internal structure of the communication device is divided into different functional units to complete all or part of the functions described above. In practical applications, the corresponding functional units in this embodiment may be implemented by corresponding hardware, or may be implemented by corresponding hardware executing corresponding software, for example, the sending unit may be hardware having the function of executing the sending unit, such as a transmitter, or a general processor or other hardware device capable of executing a corresponding computer program to perform the function; for another example, the receiving unit may be hardware that performs the function of the receiving unit, such as a receiver, or a general processor or other hardware device that can execute a corresponding computer program to perform the function; (the principles described above can be applied to various embodiments provided in this specification).

According to another aspect of the embodiments of the present invention, an embodiment of the present invention further provides a communication device, where the communication device of the present embodiment includes: a memory coupled to the processor, the memory for storing information including program routines executed by the processor, and the processor for controlling execution of the program routines; specifically, the processor is configured to perform the functions implemented by the transmitting unit 61 and the receiving unit 62 shown in fig. 6, which include the transmitting unit 61 and the receiving unit 6, or the processor is configured to perform the functions implemented by the transmitting unit 72 and the receiving unit 71 shown in fig. 7, which include the transmitting unit 72 and the receiving unit 71. Both the memory and the processor may be implemented by logic integrated circuits.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for retransmission of a signal, comprising:

the first device receives the data signal transmitted by the second device according to the third scheduling scheme on the second frequency band.

2. The method of claim 1,

the second scheduling scheme is the same as the first scheduling scheme, and the second frequency band is the same as the first frequency band;

or,

3. The method of claim 1, wherein each of the first scheduling scheme and the second and third scheduling schemes comprises one or more of the following information:

4. The method of claim 1, wherein after the first device receives the data signal transmitted by the second device according to the third scheduling scheme on the second frequency band, further comprising:

5. The method of any of claims 1 to 4, wherein before the first device receives the data signal transmitted by the second device according to the first scheduling scheme on the first frequency band, the method further comprises:

6. The method of claim 4, wherein if the data signal sent by the second device is still not correctly received by the first device, the first device continues to send a first error indication to the second device, comprising:

7. The method according to any one of claims 1 to 4,

or,

8. A method for retransmission of a signal, comprising:

9. The method of claim 8,

or,

10. The method of claim 8, wherein each of the first scheduling scheme and the second scheduling scheme and the third scheduling scheme comprises one or more of the following information:

11. The method according to any of claims 8 to 10, wherein the second device further comprises, after transmitting the data signal to the first device on the second frequency band according to the third scheduling scheme:

12. The method of any of claims 8 to 10, wherein the second device further comprises, before transmitting data signals to the first device on the first frequency band according to the first scheduling scheme:

the second device sends a first reference signal to the first device, so that the first device determines a first scheduling scheme according to the first reference signal and sends the first scheduling scheme to the second device;

13. The method of claim 11, wherein the second device continuing to receive the first error indication sent by the first device when the data signal sent by the second device is not correctly received comprises:

14. The method according to any one of claims 8 to 10,

or,

15. A communication device, comprising:

the receiving unit is configured to receive, on a second frequency band, a second reference signal that is sent by the other device according to a second scheduling scheme after receiving the first error indication after the sending unit sends the first error indication, where the second scheduling scheme is used to instruct the other device to send the second reference signal on the second frequency band;

16. The communication device of claim 15,

or,

17. The communications device of claim 15, wherein each of the first scheduling scheme and the second and third scheduling schemes comprises one or more of the following information:

18. The apparatus according to claim 15, wherein the sending unit is further configured to continue sending the first error indication to the other apparatus when the receiving unit still does not correctly receive the data signal sent by the other apparatus, until the number of times that the sending unit sends the first error indication reaches a preset threshold.

19. The communication device according to any of claims 15 to 18, wherein the receiving unit is further configured to

20. The communication device of claim 18,

21. The communication device according to any of claims 15 to 18, wherein the communication device is a network device, the other device is a user equipment UE, and the second reference signal is a sounding reference signal SRS;

or,

22. A communication device, comprising:

the transmitting unit is further configured to, in response to the first error indication after the receiving unit receives the first error indication, transmit a second reference signal to the other device on a second frequency band according to a second scheduling scheme, where the second scheduling scheme is used to instruct the communication device to transmit the second reference signal on the second frequency band;

23. The communication device of claim 22,

or,

24. The communications device of claim 22, wherein each of the first scheduling scheme and the second scheduling scheme and the third scheduling scheme comprises one or more of the following information:

25. The communication device according to any one of claims 22 to 24, wherein the receiving unit is further configured to continue receiving the first error indication sent by the other device when the data signal sent by the communication device is not correctly received, until the number of times of receiving the first error indication reaches a preset threshold.

26. The communication device according to any of claims 22 to 24, wherein the transmitting unit is further configured to transmit a first reference signal to another device before transmitting a data signal to the another device on the first frequency band according to a first scheduling scheme, so that the another device determines a first scheduling scheme according to the first reference signal and transmits the first scheduling scheme to the communication device;

27. The communication device of claim 25,

28. The communication device according to any of claims 22 to 24,

or,