CN103888995B - The method and apparatus that signal is retransmitted - Google Patents

Abstract

The present invention provides a method and device for signal retransmission, wherein the method includes: the first device receives the data signal sent by the second device on the first frequency band according to the first scheduling scheme, and the first scheduling scheme instructs the second device to Send a data signal on the first frequency band; when the first device fails to correctly receive the data signal sent by the second device, send a first error indication to the second device, and the first error indication is used to instruct the second device to resend the data signal; The first device receives the second reference signal sent by the second device according to the second scheduling scheme on the second frequency band; the first device sends scheduling adjustment information determined according to the second reference signal to the second device, and the scheduling adjustment information is used to indicate the second The second device determines a third scheduling scheme for sending the data signal; the first device receives the data signal sent by the second device according to the third scheduling scheme on the second frequency band. The above method is used to solve the problem of reduced reliability during signal retransmission in the prior art.

Description

Method and device for signal retransmission

technical field

The present invention relates to communication technology, in particular to a method and equipment for signal retransmission.

Background technique

In a wireless communication system, in order to improve transmission efficiency under the premise of ensuring transmission reliability, network devices usually estimate the quality of the wireless channel used to transmit signals, and determine a scheduling scheme according to the quality of the wireless channel. If the estimated wireless channel quality is good, 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 adopted.

Specifically, in the current wireless communication system, the quality information of the wireless channel is usually obtained through the transmission of a reference signal (Reference Signal, “RS” for short). For example, in the downlink transmission process of the Long Term Evolution (referred to as "LTE") system, the network device transmits a channel state information reference signal (Channel State Information Reference Signal) to the user equipment (User Equipment, referred to as "UE") , referred to as "CSI-RS"), and send the CSI-RS to the UE; the UE measures the received CSI-RS according to the CSI-RS parameters, so as to obtain the quality of the downlink channel and determine a recommendation The scheduling scheme is fed back to the network equipment; the network equipment determines the final downlink scheduling scheme according to the suggested scheduling scheme fed back by the UE.

For another example, in the uplink transmission process of the LTE system, the network equipment sends the parameters of the Sounding Reference Signal (Sounding Reference Signal, referred to as "SRS") to the UE; after the UE receives the parameters of the SRS, it sends the SRS according to the parameters ; Thus, the network device can obtain the quality of the uplink channel by measuring the SRS sent by the UE, and determine the final uplink scheduling scheme.

The quality of the channel is obtained by measuring CSI-RS/SRS. The process specifically includes: assuming that the signal sent by the sender is S (CSI-RS or SRS), and the channel through which the signal passes is H, the signal received by the receiver is H×S+I+Nd, where I represents the interference of other signals on signal transmission, and Nd represents the influence of noise on signal transmission; after the receiver receives the CSI-RS/SRS, because the receiver knows The CSI-RS or SRS (namely S) can estimate the quality of the wireless channel through which the CSI-RS/SRS passes, for example, calculate the SINR of the received signal.

Currently, in a wireless communication system, a signal sent by a sender will be interfered by signals sent by other senders, so it is necessary to measure the interference situation before sending to determine a scheduling scheme that is conducive to suppressing interference based on the interference situation; since the measurement time and Signal transmission times are different, and if the interference situation changes drastically between these two times, it will cause the determined scheduling scheme not to conform to the channel quality when the signal is transmitted. For example, in a cellular communication system, the signal sent by UE1 to the receiver corresponding to cell 1 (such as a base station) will be interfered by UE2 from cell 2 and UE3 from cell 3, where UE2 is far away from the receiver of cell 1, so The interference caused by UE2 is relatively weak, and because UE3 is close to the receiver of cell 1, the interference caused by UE3 is relatively strong. If cell 1 determines the scheduling scheme of UE1 by measuring the signal sent by UE1 at the first moment, and at this time UE2 sends a signal (causing interference to the signal sent by UE1), but UE3 does not send a signal (it will not interfere with the signal sent by UE1) cause interference), at this time cell 1 determines that the transmission efficiency corresponding to the scheduling scheme of UE1 is usually higher; after cell 1 notifies UE1 of the determined scheduling scheme, UE1 sends the uplink signal according to the scheduling scheme at the second moment, and If at the second moment, UE3 sends a signal (causing strong interference to the signal sent by UE1), but UE2 does not send a signal (will not cause interference to the signal sent by UE1), then the scheduling scheme determined in advance by cell 1 for UE1 is not The channel quality of UE1 at the second moment can be accurately matched, so that the signal sent by UE1 may not be correctly received by cell 1, that is, the reliability of signal transmission is low.

In order to solve the above problems, people in the industry have proposed the following solutions, for example: at the 0th moment, the network device sends a scheduling signaling to the UE, instructing the UE to send a reference signal in the first frequency band, and at the 2nd moment, the UE Scheduling signaling, sending signals to network devices in the first frequency band. The network device determines a scheduling adjustment scheme according to the received signal, and sends scheduling adjustment information to the UE at the second moment. At the third moment, the UE adjusts the signal scheduling scheme accordingly according to the scheduling adjustment information, and sends the data signal to the network device in the first frequency band. From the above, at the first moment, all UEs in the cellular communication system have sent signals, so that the network equipment can prepare to measure the interference level in the system, so that the Signal to Interference and Noise Ratio (Signal to Interference) during actual data transmission can be predicted. plus Noise Ratio, referred to as "SINR") level. However, at the third moment, the UE will send the data to the network device. After the network device receives the data, it will judge whether the data packet is received correctly. If it is received correctly, the base station will feed back "ACK" information to the UE through the downlink , the reception of the packet is complete. Otherwise, if the base station fails to receive the data correctly, the base station will feed back "NACK" information to the UE through the downlink. If the UE receives the NACK information, it needs to retransmit the data. For other cells, the retransmission is still Interference is caused, therefore, the above solution still does not solve the interference measurement problem, and the reliability of signal transmission cannot be guaranteed.

As shown in Figure 1, in practical applications, the signal sent by UE1 to the receiver corresponding to cell 1 (such as a base station) will be interfered by UE2 from cell 2 and UE3 from cell 3, as described in the prior art, Ultimately, the reliability of signal transmission is reduced.

For this reason, as shown in FIG. 2 , technical solutions provided by industry insiders to solve the reduction in reliability of signal transmission. As described in the prior art, at time 0, the network device sends a scheduling signaling to the UE, instructing the UE to send a reference signal in the first frequency band. The device sends a reference signal. The network device determines a scheduling adjustment scheme according to the received signal, and sends scheduling adjustment information to the UE at the second moment. At the third moment, the UE adjusts the signal scheduling scheme accordingly according to the scheduling adjustment information, and sends the data signal to the network device in the first frequency band. The advantage of this solution is that since the UEs sending reference signals in the network at the first moment and the UEs sending data in the network at the third moment are the same group of UEs, the measurement results of the network equipment at the second moment can be predicted more accurately The transmission quality at the third moment is obtained, and the measurement includes channel quality measurement and interference level measurement. However, if the user equipment receives NACK information, it needs to retransmit the data. If there are a large number of retransmission users in the system, the interference to other cells will be very strong. The interference caused by the retransmission users is not considered in the prior art , so the choice of scheduling scheme is still inaccurate.

Contents of the invention

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

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

The first device receives, on the first frequency band, a data signal sent by the second device according to a first scheduling scheme, where the first scheduling scheme is used to instruct the second device to send the data signal on the first frequency band;

When the first device does not correctly receive the data signal sent by the second device, send a first error indication to the second device, where the first error indication is used to instruct the second device to resend the data signal;

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

The first device sends to the second device scheduling adjustment information determined according to the second reference signal, where the scheduling adjustment information is used to instruct the second device to determine a third schedule for sending the data signal plan;

The first device receives the data signal sent 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 manner, in a second possible implementation manner, each of the first scheduling scheme, the second scheduling scheme, and the third scheduling scheme includes one of the following information Kind or more:

Sending power information, modulation mode information, coding rate information, redundancy version used when the second device sends the data signal, and information about whether the second device uses a frequency hopping mode to send the data signal.

With reference to the first aspect and the foregoing possible implementation manner, in a third possible implementation manner, the first device receives, on the second frequency band, the After the data signal, also include:

If the first device still fails to 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 first device sends The number of times of the first error indication reaches a preset threshold.

With reference to the first aspect and the foregoing possible implementation manners, in a fourth possible implementation manner, before receiving the data signal sent by the second device according to the first scheduling scheme on the first frequency band, the first device 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 includes a plurality of independent data blocks, and the first device does not correctly receive any data block in the data signal, the number of transmission layers in the second reference signal received by the first device indicating that the RI and the precoding matrix indicating PMI are the same as the RI and PMI in the first reference signal received by the first device;

If the data signal includes multiple independent data blocks, and the first device does not correctly receive some of the data blocks in the data signal, then the RI, PMI and The RI and PMI in the first reference signal received by the first device are different.

With reference to the first aspect and the third possible implementation manner, in a fifth possible implementation manner, if the first device still fails to correctly receive the data signal sent by the second device, the The first device continues to send the first error indication to the second device, including:

When the first device fails to correctly receive the data signal sent by the second device, it sends an Mth first error indication to the second device, and the first error indication is used to indicate that the second device resending said data signal;

The first device receives the Qth reference signal sent by the second device according to the Pth scheduling scheme on the Nth frequency band;

The first device sends to the second device scheduling adjustment information determined according to the Qth reference signal, where the scheduling adjustment information is used to instruct the second device to determine the P+th 1 scheduling plan;

receiving, by the first device, the data signal sent by the second device according to the P+1th 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 and Q are positive integers greater than 2, and the frequency band used by the second device to retransmit the data signal is the same as that used for sending the data signal before The frequency bands are not repeated.

In combination with the first aspect and the above possible implementation, 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,

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

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

The second device sends a data signal to the first device on the first frequency band according to a first scheduling scheme, where the first scheduling scheme is used to instruct the second device to send the data signal 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, and the first error indication is used to instruct the second device to resend the data signal ;

In response to the first error indication, the second device sends a second reference signal to the first device on a second frequency band according to a second scheduling scheme, where the second scheduling scheme is used to instruct the second device sending the second reference signal on a second frequency band;

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

The second device sends 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,

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 second aspect and the above possible implementation manner, in a second possible implementation manner, each of the first scheduling scheme, the second scheduling scheme, and the third scheduling scheme includes the following information One or more of:

Sending power information, modulation mode information, coding rate information, redundancy version used when the second device sends the data signal, and information about whether the second device uses a frequency hopping mode to send the data signal.

With reference to the second aspect and the foregoing possible implementation manners, in a third possible implementation manner, the second device sends the first device on the second frequency band according to the third scheduling scheme. After the data signal, also include:

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, until the number of times of receiving the first error indication reaches a preset threshold.

With reference to the second aspect and the foregoing possible implementation manners, in a fourth possible implementation manner, before the second device sends a 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 sends the second reference signal using the The transmission layer number indicator RI and the precoding matrix indicator PMI used when the second device sends the first reference signal;

If the data signal includes a plurality of independent data blocks, and the first device does not correctly receive some of the data blocks in the data signal, the second device sends the second reference signal using the same Different PI and PMI when the second device sends the first reference signal.

With reference to the second aspect and the third possible implementation manner, in a fifth possible implementation manner, the second device continues to receive the data signal sent by the second device when the first device fails to correctly receive The first error indication sent, including:

In response to the first error indication, the second device sends a Qth reference signal to the first device on the Nth frequency band according to the Pth scheduling scheme;

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

The second device sends the data signal to the first device on the Nth frequency band according to the P+1th scheduling scheme;

Wherein, P is a positive integer greater than 3, N and Q are positive integers greater than 2, and the frequency band used by the second device to retransmit the data signal does not overlap with the frequency band used to transmit the data signal before.

With reference to the second aspect and the foregoing possible implementation manner, in the 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,

If the first device is a user equipment UE and the second device is a network device, the second reference signal is a 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 sent by another device according to a first scheduling scheme, where the first scheduling scheme is used to instruct the other device to send the data signal on a 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, and the first error indication is used to indicate the other device resending said data signal;

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

The sending unit is configured to, after the receiving unit receives the second reference signal, send scheduling adjustment information determined according to the second reference signal to the other device, where the scheduling adjustment information is used to indicate the The other device determines a third scheduling scheme for sending the data signal;

The receiving unit is configured to receive, on the second frequency band, the data signal sent by the other device according to the third scheduling scheme after the sending unit sends 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,

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

Sending power information, modulation mode information, coding rate information, redundancy version used when the other device sends the data signal, and information about whether the other device uses a frequency hopping mode to send the data signal.

With reference to the third aspect and the above possible implementation manner, in a third possible implementation manner, the sending unit is further configured to, when the receiving unit still fails to correctly receive the data signal sent by the other device , continue to send the first error indication to the other device until the number of times the sending unit sends the first error indication reaches a preset threshold.

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

Before receiving a data signal sent by another device according to the first scheduling scheme on the first frequency band, further receiving a first reference signal sent 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 includes a plurality of independent data blocks, and the receiving unit does not correctly receive any data block in the data signal, the transmission layer number indication RI in the second reference signal received by the receiving unit . The precoding matrix indicates that the PMI is 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 does not correctly receive some data blocks in the data signal, the RI and PMI in the second reference signal received by the receiving unit and the The RI and PMI in the first reference signal received by the receiving unit are different.

In combination with the third aspect and the third possible implementation above, in the fifth possible implementation,

The sending unit is further configured to send an Mth first error indication to the other device when the receiving unit still fails to correctly receive the data signal sent by the other device, and the first error indication for instructing the other device to resend the data signal;

The receiving unit is further configured to receive, on the Nth frequency band, the Qth reference signal sent by the other device according to the Pth scheduling scheme after the sending unit sends the Mth first error indication;

The sending unit is further configured to, after the receiving unit receives the Qth reference signal, send scheduling adjustment information determined according to the Qth reference signal to the other device, where the scheduling adjustment information is used to indicate The other device determines a P+1th scheduling scheme for sending the data signal;

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

Wherein, M takes a positive integer greater than 1, P takes a positive integer greater than 3, N and Q take a positive integer greater than 2, and the frequency band used by the other device to retransmit the data signal is the same as the frequency band used to send the data signal before The frequency bands are not repeated.

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 other 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 a channel state information-reference signal CSI-RS.

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

A sending unit, configured to send a data signal to another device on a first frequency band according to a first scheduling scheme, where the first scheduling scheme is used to instruct the communication device to send the data signal on the first frequency band;

a receiving unit, configured to receive, after the sending unit sends the data signal, a first error indication sent by the other device when the data signal sent by the communication device is not correctly received, and the first error indication is used instructing the communication device to resend the data signal;

The sending unit is further configured to, after the receiving unit receives the first error indication, respond to the first error indication, and according to a second scheduling scheme, send the A second reference signal, where the second scheduling scheme is used to instruct the second device to send the second reference signal on a second frequency band;

The receiving unit is configured to receive scheduling adjustment information determined according to the second reference signal sent by the other device after the sending unit sends the second reference signal, and determine according to the scheduling adjustment information A third scheduling scheme for sending the data signal;

The sending unit is configured to, after the receiving unit receives the scheduling adjustment information and determines a third scheduling scheme, according to the third scheduling scheme, send the information to the other device on the second frequency band the data signal.

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,

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 fourth aspect and the above 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 the following information One or more of:

Sending power information, modulation mode information, coding rate information, redundancy version used when the communication device sends the data signal, and information about whether the communication device uses a frequency hopping mode to send the data signal.

With reference to the fourth aspect and the above possible implementation manners, in a third possible implementation manner, the receiving unit is further configured to continue to receive the data signal sent by the other device when the data signal sent by the communication device is not correctly received. the first error indication 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 manner, in a fourth possible implementation manner, the sending unit is further configured to, before sending a data signal to another device on the first frequency band according to the first scheduling scheme, sending a first reference signal to the other device, so that the other device determines a first scheduling scheme for sending the communication device according to the first reference signal;

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 uses the sending method when sending the second reference signal The transmission layer number indicator RI and the precoding matrix indicator PMI used when the 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 some data blocks in the data signal, the sending unit uses the same method as the sending unit when sending the second reference signal. Different PI and PMI when the units send the first reference signal.

In combination with the fourth aspect and the third possible implementation above, in the fifth possible implementation,

The sending unit is further configured to respond to the first error indication when the receiving unit continues to receive the first error indication sent by the other device when the data signal sent by the communication device is not received correctly, Sending 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 determined according to the Qth reference signal sent by the other device after the sending unit sends the Qth reference signal, and adjust the information according to the scheduling adjustment information determining the P+1th scheduling scheme for sending the data signal;

The sending unit is further configured to send the data signal to the other device on the Nth frequency band according to the P+1th scheduling scheme after the receiving unit determines the P+1th scheduling scheme ;

Wherein, P is a positive integer greater than 3, N and Q are positive integers greater than 2, and the frequency band used by the communication device to retransmit the data signal does not overlap with the frequency band used to transmit the data signal before.

In combination with the fourth aspect and the above possible implementation, in a sixth possible implementation,

The communication device is a user equipment UE, the other device is a network device, 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 a channel state information-reference signal CSI-RS.

It can be seen from the above technical solutions that the method and device for signal retransmission in the embodiments of the present invention send a first error indication to the second device when the first device does not correctly receive the data signal sent by the second device, and the first device sends the first error indication to the second device. receiving a second reference signal sent by the second device according to the second scheduling scheme on the second frequency band, and sending 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 data signals, Furthermore, the first device receives the data signal sent by the second device according to the third scheduling scheme on the second frequency band, thereby improving the reliability of signal transmission and solving the problem of reduced reliability of signals during retransmission in the prior art.

Description of drawings

In order to illustrate the technical solution of the present invention more clearly, the accompanying drawings that need to be used in the embodiments will be briefly introduced below. Obviously: the following drawings are only drawings of some embodiments of the present invention, and are common to those skilled in the art. For those skilled in the art, other drawings that can also implement the technical solution of the present invention can also be obtained based on these drawings without paying creative labor.

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

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

3A to 3C are schematic flowcharts of a method for signal retransmission according to an embodiment of the present invention;

FIG. 4A and FIG. 4B are schematic flowcharts of a method for signal retransmission according to another embodiment of the present invention;

FIG. 5 is a schematic flowchart of a method for signal retransmission provided by another embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a communication device provided by an embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a communication device provided by another embodiment of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Apparently, each of the following embodiments is only a part of the present invention. Based on the following embodiments of the present invention, even if those skilled in the art do not make creative work, they can obtain other technical features that can solve the technical problems of the present invention and realize the technical effects of the present invention by equivalently transforming some or even all of the technical features. Embodiments, and these modified embodiments obviously do not depart from the disclosed scope of the present invention.

Based on the technical solution shown in FIG. 2 above, the embodiment of the present invention provides an accurate scheduling method during signal retransmission, so as to ensure that reliability is not 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: Global System of Mobile communication (Global System of Mobile communication, referred to as "GSM") system, Code Division Multiple Access (Code Division Multiple Access, referred to as "GSM") system, CDMA") system, Wideband Code Division Multiple Access (WCDMA for short) system, General Packet Radio Service (GPRS for short), LTE system, LTE Frequency Division Duplex (Frequency Division Duplex (referred to as "FDD") system, LTE Time Division Duplex (Time Division Duplex, referred to as "TDD"), Universal Mobile Telecommunication System (Universal Mobile Telecommunication System, referred to as "UMTS"), Global Internet Microwave Access ( Worldwide Interoperability for Microwave Access, referred to as "WiMAX") communication system, etc.

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

In this embodiment of the present invention, the network device may be a base station, an access point (Access Point, "AP" for short), a remote radio equipment (Remote Radio Equipment, "RRE" for short), a remote radio port (Remote RadioHead , referred to as “RRH” for short), a remote radio unit (Remote Radio Unit, referred to as “RRU”), or a relay node (RelayNode, referred to as “RN” for short), etc. The base station can be a base station (Base Transceiver Station, "BTS" for short) in GSM or CDMA, or a base station (NodeB, "NB" for short) in WCDMA, or an evolved base station (Evolutional Node) in LTE. B, referred to as "ENB or e-NodeB"). It should also be understood that, in the embodiment of the present invention, the network device may also be other devices with a scheduling function, such as a UE with a scheduling function, and the embodiment of the present invention is not limited thereto.

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

FIG. 3A shows a schematic flowchart of a signal retransmission method provided by an embodiment of the present invention. As shown in FIG. 3A , the signal retransmission method in this embodiment is as follows.

301. The first device receives, on a first frequency band, a data signal sent by a second device according to a first scheduling scheme, where the first scheduling scheme is used to instruct the second device to send the data signal on a first frequency band;

302. When the first device does not correctly receive the data signal sent by the second device, send a first error indication to the second device, where the first error indication is used to instruct the second device to resend the data signal;

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

304. The first device sends to the second device scheduling adjustment information determined according to the second reference signal, where the scheduling adjustment information is used to instruct the second device to determine a third schedule for sending the data signal plan;

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

In the 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 to say, when the first device fails to correctly receive the data signal sent by the second device, it can use the original signal transmission scheme to retransmit the data signal.

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

Sending power information, modulation mode information, coding rate information, information about the redundancy version used when the second device sends the data signal, information about whether the second device uses a frequency hopping mode for sending the data signal, and the like.

Since the third scheduling solution is sent through scheduling adjustment information, the adjustment information may only include the adjustment value or difference of the above information, instead of a complete scheduling information. The adjustment information may also only adjust at least part of the scheduling information in the first scheduling scheme or the second scheduling scheme, but not all of them.

The first scheduling scheme may be sent by the first device to the second device before the first device sends 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-specified by a wireless communication protocol. In the case of pre-agreement by the wireless communication protocol, both the first device and the second device automatically transmit the second reference signal using the second scheduling scheme according to the agreement after the second device sends the first error indication.

In addition, in practical applications, after step 305, the above signal retransmission method may also include step S01 not shown in the following figure:

S01. If the first device still fails to correctly receive the data signal sent by the second device, the first device continues to send the first error indication to the second device. At this time, it may also The retransmission of the data signal is performed according to the original signal transmission scheme.

When the number of times the first device sends the first error indication reaches a preset threshold, the first device stops 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 also 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, referring to FIG. 2 as an example, 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 signal retransmission further includes steps not shown in the figure M01:

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 signal is retransmitted, 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 received data of the first device The transmission layer number indication (Rank Indication, RI for short) and the precoding matrix indication (Precoding Matrix Indication, PMI for short) in the second reference signal are the same as the RI and PMI in the first reference signal received by the first device;

If the data signal includes multiple independent data blocks, and the first device does not correctly receive some of the data blocks in the data signal, then the RI, PMI and The RI and PMI in the first reference signal received by the first device are different.

In the 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 steps 303 and 305 may be different from the first frequency band in step 301 .

That is to say, when the first device fails to correctly receive the data signal sent by the second device, it can use a new signal transmission scheme to transmit the data signal.

Certainly, in the 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:

Sending power information, modulation mode information, coding rate information, information about the redundancy version used when the second device sends the data signal, information about whether the second device uses a frequency hopping mode for sending the data signal, and the like.

The first scheduling scheme and the second scheduling scheme also respectively indicate frequency domain resources used for sending the data signal, that is, the above-mentioned frequency band for sending the data signal. Since the third scheduling scheme is carried in the scheduling adjustment information, it does not re-indicate the frequency band for sending the data signal. After receiving the scheduling adjustment information, the second device will naturally resend the data signal on the second frequency band according to the third scheduling scheme.

The modulation mode information included in the scheduling scheme can indicate what kind of modulation mode the second device adopts for signal transmission. The modulation mode includes QPSK (quadrature phase shift keying signal) with low efficiency and 16 quadrature amplitude modulation with high efficiency. (Quadrature Amplitude Modulation, referred to as "QAM"), 64QAM, etc.

The coding rate information included in the scheduling scheme may indicate what kind of coding method the second device adopts. If the coding rate is high, the information transmission will be high.

The redundancy version information included in the scheduling scheme may indicate which part of the encoded data to send to the second device after the encoding is completed.

The frequency hopping pattern information included in the scheduling scheme may indicate whether the second device divides the data into multiple parts when sending data, and sends 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 second device retransmits the data signal every time The frequency band used for the signal may be different.

For example, the following steps R01 to R04 can be used to retransmit the data signal:

R01. When the first device fails to correctly receive the data signal sent by the second device, it sends the Mth first error indication to the second device, and the first error indication is used to indicate the first error indication The second device resends the data signal;

R02. The first device receives the Qth reference signal sent by the second device according to the Pth scheduling scheme on the Nth frequency band;

R03. The first device sends to the second device scheduling adjustment information determined according to the Qth reference signal, where the scheduling adjustment information is used to instruct the second device to determine a Qth QS for sending the data signal P+1 scheduling scheme;

R04. The first device receives, on the Nth frequency band, the data signal sent by the second device according to the P+1th scheduling scheme;

Wherein, M is a positive integer greater than 1, P is a positive integer greater than 3, N and Q are positive integers greater than 2, and the frequency band used by the second device to retransmit the data signal is the same as that used for sending the data signal before The frequency bands are not repeated. If M is changed in these steps, P, N, and Q are changed sequentially.

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

As mentioned above, any scheduling adjustment information may include the adjustment value of the scheduling information in any previously adopted scheduling scheme, and the scheduling adjustment information may only adjust one or more scheduling information in the previous scheduling scheme, It is not necessary to adjust the entire scheduling scheme. The adjustment value may be a difference between the currently used scheduling information and the previous scheduling information, instead of a complete value.

In practical applications, the current protocol specifies a maximum threshold for signal retransmission. If the number of times 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. The first error indication, that is, the first device stops continuing to acquire the incorrectly received data signal.

In addition, when the signal is retransmitted, if the data signal includes multiple independent data blocks, and the first device does not receive any data block in the data signal correctly, the first device received by the first device RI and PMI in the second reference signal are the same as RI and PMI in the first reference signal received by the first device;

If the data signal includes multiple independent data blocks, and the first device does not correctly receive some of the data blocks in the data signal, then the RI, PMI and The RI and PMI in the first reference signal received by the first device are different.

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

In addition, in step 303, the second device sends the second reference signal on the second frequency band according to the second scheduling scheme, which may be performed according to the default mode of the wireless communication standard protocol, or according to the 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:

First: the first error indication is used to instruct the second device to resend the data signal, and at this time, the second device resends the data signal to the first device in a manner specified in the protocol;

Second: the first error indication is used to instruct the second device to resend the data signal on the first frequency band according to the first scheduling scheme;

Third: the first error indication is used to instruct the second device to resend the data signal on the second frequency band according to a scheme different from the first scheduling scheme;

Therefore, the second scheduling scheme in this embodiment may be different from the first scheduling scheme, and the second scheduling scheme is configured by the first device through high-layer signaling. Of course, the second scheduling scheme may be the same as the first scheduling scheme. In this way, the devices on both sides still send the second reference signal according to the original first scheduling scheme.

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

or

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

It should be understood that in the current communication system, the uplink signal sent by the UE will be controlled by the network device, that is, the network device first sends the control signaling including the scheduling scheme to the UE. For example, in the LTE system, the base station will send the physical downlink control signal to the UE. Channel (Physical Downlink Control Channel, referred to as "PDCCH") signal. After receiving the control signaling, the UE sends an uplink signal according to the control signaling. For example, in the LTE system, the control signaling includes one or more of the following information: information about the frequency band used by the UE to send signals, the modulation scheme and/or coding rate information used, the power or power adjustment used for sending signals Quantitative information, etc.

In addition, if the UE sends uplink signals through multiple antenna ports, the control signaling may also include the number of layers used for sending signals, the precoding matrix used for sending signals, or the antenna port selected for sending signals, etc. After receiving the control signaling, the UE can perform channel coding on the data to be sent according to the coding rate; modulate the coded data according to the modulation method; map the modulated symbols to the corresponding frequency band; go out. Optionally, after obtaining the modulated symbols, the modulated symbols can also be mapped to multiple layers of space according to the layer number information, and then the multi-layer signals can be precoded according to the precoding matrix information, or the selected antenna sent on the port. For the sake of brevity, details are not repeated here.

FIG. 3B shows a schematic flowchart of a method for signal retransmission provided by an embodiment of the present invention. As shown in FIG. 3B , the method for signal retransmission in this embodiment is as follows.

311. The network device receives, on the first frequency band, a data signal sent by the UE according to a first scheduling scheme, where the first scheduling scheme is used to instruct 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: the frequency band carried by the UE to send the signal, the modulation scheme and/or coding rate used for sending the signal, and the power used for sending the signal /Power adjustment amount, the number of layers used for sending signals (for example, the rank in the LTE system (Rank)), the precoding matrix (Precoding Matrix) used for sending signals, the antenna port selected for sending signals, etc. Wherein, the combination of the modulation scheme and the coding rate may be called a Modulation and Coding Scheme (Modulation and Coding Scheme, “MCS” for short).

It can be understood that the network device interacts with the UE to determine the first scheduling scheme. For example, as shown in FIG. 2, the network device sends a scheduling scheme to the UE, and the scheduling scheme is used to instruct the UE to send a data signal on the first frequency band; the first reference signal, and send to the UE scheduling adjustment information determined according to the first reference signal, where the scheduling adjustment information is used to enable the UE to determine a first scheduling scheme for sending the data signal; and then in the UE receiving the data signal sent by the UE according to the first scheduling scheme on the first frequency band.

312. When the network device does not correctly receive the data signal sent by the UE, send a first error indication to the UE, where the first error indication is used to instruct the second device to resend the data signal;

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

314. The network device sends to the UE scheduling adjustment information determined according to the second reference signal, where the scheduling adjustment information is used to instruct 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 mode information, and coding rate information. Preferably, the scheduling adjustment information includes modulation mode information and coding rate information, that is, MCS information. Or, the scheduling adjustment information includes the adjustment value of the modulation and coding scheme and the like.

It should be understood that, in this embodiment, the scheduling adjustment information may include the 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 the adjustment value of the transmission power; the modulation mode information may include the final modulation mode, or may include the adjustment value of the modulation mode; the coding rate information may include the final The coding rate may also include the adjustment value of the coding rate and so on.

315. The network device receives, on the first frequency band, the data signal sent by the UE according to the third scheduling scheme.

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 incorrect, repeat the above steps 311 to 315 .

Of course, if the network device correctly demodulates the above data signal, it will send an indication of correct reception of the data signal to the UE.

It can be seen from the above embodiments that, 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 first error indication according to the first scheduling scheme. The second reference signal is transmitted to the network device, so that the network device determines the scheduling adjustment information according to the second reference signal, thereby determining the final third scheduling scheme, realizing the matching between the third scheduling scheme and the channel quality at the time of signal transmission, and improving the signal quality. The transmission reliability solves the problem in the prior art that the reliability of the signal is reduced during retransmission.

Of course, in practical applications, if the network device successfully receives the above-mentioned data signal, the network device sends an indication of correct reception of the data signal to the UE; if the network device fails to receive the above-mentioned data signal correctly, the network device sends The UE sends the first error indication mentioned in step 312 above.

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 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 continuing to acquire the incorrectly received data signal.

That is to say, the current standard defines the maximum number of retransmissions that the network device can send, that is, the threshold of the number of times of the first error indication. If the number of times the network device sends the first error indication reaches a preset threshold and the network device has not correctly received the data signal, at this time, the network device stops acquiring the incorrectly received data signal.

In a special scenario, if the network device fails to correctly receive the data signal sent by the UE on the first frequency band, and the number of times the network device sends the first error indication does not reach a preset threshold, Then, after the network device executes the above steps 311 to 315, it may also use steps 401 to 405 for example as follows to retransmit the above data signal. This embodiment is only for illustration, and does not limit the combined use of each embodiment.

In another optional application scenario, in the aforementioned step 313, the RI and PMI used by the UE when sending the second reference signal may be the same as the RI and PMI used by the UE when sending the first reference signal; or, the UE sends The RI and PMI used when the second reference signal is used may be different from the RI and PMI used when the UE sends the first reference signal.

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

If the data signal includes multiple independent data blocks, and the network device does not correctly receive some of the data blocks in the data signal, the RI and PMI in the second reference signal received by the network device and the The RI and PMI in the first reference signal received by the network device are different;

Wherein, the first reference signal is a reference signal sent by the UE before sending the data signal by using the first scheduling scheme.

It should be noted that the RI and PMI of the UE when initially transmitting data signals are specified by the network device when scheduling the UE for transmission; where RI represents the number of parallel data streams used for uplink transmission, and PMI represents the number of parallel data streams used for multi-antenna precoding. The precoding matrix of . That is to say, when the network device schedules the UE to transmit data signals, it will send a signaling to the UE, informing the UE what RI and PMI to use, and then the UE uses the RI and PMI specified by the network device to generate a data signal for sending to the network device.

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

FIG. 3C shows a schematic flowchart of a method for signal retransmission provided by an embodiment of the present invention. As shown in FIG. 3C , the method for signal retransmission in this embodiment is as follows.

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

322. When the UE does not correctly receive the data signal sent by the network device, send a first error indication to the network device, where the first error indication is used to instruct the network device to resend the data signal;

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

324. The UE sends to the network device scheduling adjustment information determined according to the second reference signal, where the scheduling adjustment information is used to instruct the network device to determine a third scheduling scheme for sending the data signal;

325. The UE receives the data signal sent by the network device 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 incorrect, repeat the above steps 321 to 325.

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

It should be understood 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, stopping acquiring the incorrectly received data signal.

It can be known from the above embodiments that the method for signal retransmission in this embodiment can improve the reliability of signal transmission, solve the problem of reduced reliability of signals during retransmission in the prior art, and improve the efficiency of signal transmission at the same time.

FIG. 4A shows a schematic flowchart of a signal retransmission method provided by an embodiment of the present invention. As shown in FIG. 4A , the signal retransmission method in this embodiment is as follows.

401. The network device receives, on the first frequency band, a data signal sent by the UE according to a first scheduling scheme, where the first scheduling scheme is used to instruct 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 by the network device, send a first error indication to the UE, where the first error indication is used to instruct the UE to resend the data signal;

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

404. The network device sends to the UE scheduling adjustment information determined according to the second reference signal, where the scheduling adjustment information is used to instruct the UE to determine a third scheduling scheme for sending the data signal;

405. The network device receives, on the second frequency band, the data signal sent by the UE according to the third scheduling scheme.

The above-mentioned 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 fails to correctly receive the data signal sent by the UE, and the number of times the network device sends the first error indication does not reach the preset threshold , then the method further includes steps R01' to R05' not shown in the following figures:

R01'. When the network device fails to correctly receive the data signal sent by the UE, send the Mth first error indication to the UE, where the first error indication is used to instruct 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 sends to the UE scheduling adjustment information determined according to the Qth reference signal, where the scheduling adjustment information is used to instruct the UE to determine a P+1th scheduling scheme for sending the data signal;

R04'. A network device receives, on the Nth frequency band, the data signal sent by the UE according to the P+1th scheduling scheme;

Wherein, M is a positive integer greater than 1, P is a positive integer greater than 3, N and Q are positive integers greater than 2, and the frequency band used by the UE to retransmit the data signal is different from the frequency band used to transmit the data signal before. repeat. When the above-mentioned M changes, P, N, and Q change in sequence.

That is to say, if the UE fails to retransmit the data signal on the second frequency band, it retransmits the data signal on the third frequency band, and so on, and the frequency band used for each retransmission of the data signal is different.

It can be known from the above embodiments that the method for signal retransmission in this embodiment can improve the reliability of signal transmission, solve the problem of reduced reliability of signals during retransmission in the prior art, and improve the efficiency of signal transmission at the same time.

FIG. 4B shows a schematic flowchart of a signal retransmission method provided by an embodiment of the present invention. As shown in FIG. 4B , the signal retransmission method in this embodiment is as follows.

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

412. When the UE does not correctly receive the data signal sent by the network device, send a first error indication to the network device, where the first error indication is used to instruct the network device to resend the data signal;

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

414. The UE sends to the network device scheduling adjustment information determined according to the second reference signal, where the scheduling adjustment information is used to instruct the network device to determine a third scheduling scheme for sending the data signal;

415. The UE receives the data signal sent by the network device according to the third scheduling scheme on the second frequency band.

In the above steps, 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 fails to correctly receive the data signal sent by the network device, the UE continues to send the first error indication to the network device, specifically including the following steps N01 to step N04:

N01. When the UE fails to correctly receive the data signal sent by the network device, it sends the Mth first error indication to the network device, and the first error indication is used to instruct the network device to resend the data Signal;

N02. The UE receives the Qth reference signal sent by the network device according to the Pth scheduling scheme on the Nth frequency band;

N03. The UE sends scheduling adjustment information determined according to the Qth reference signal to the network device, where the scheduling adjustment information is used to instruct the network device to determine a P+1th scheduling scheme for sending the data signal;

N04. The UE receives, on the Nth frequency band, the data signal sent by the network device according to the P+1th scheduling scheme;

Wherein, M takes a positive integer greater than 1, P takes a positive integer greater than 3, N and Q take a positive integer greater than 2, and the frequency band used by the network device to retransmit the data signal is the same as the frequency band used to send the data signal before. Frequency bands are not repeated. When the above-mentioned M changes, P, N, and Q change in sequence.

FIG. 5 shows a schematic flowchart of a signal retransmission method provided by another embodiment of the present invention. As shown in FIG. 5 , the signal retransmission method in this embodiment is as follows.

501. The second device sends the data signal to the first device on the first frequency band according to a first scheduling scheme, where the first scheduling scheme is used to instruct the second device to send the data signal on the first frequency band said data signal;

502. 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, and the first error indication is used to instruct the second device to resend the data signal ;

503. In response to the first error indication, the second device sends a second reference signal to the first device on a second frequency band according to a second scheduling scheme, where the second scheduling scheme is used to instruct the second device sending the second reference signal on a second frequency band;

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

505. The second device sends 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, 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, redundancy version used when the second device sends the data signal, information about whether the second device uses a frequency hopping mode to send the data signal, and the like.

Since the third scheduling solution is sent through scheduling adjustment information, the adjustment information may only include the adjustment value or difference of the above information, instead of a complete scheduling information. The adjustment information may also only adjust at least part of the scheduling information in the first scheduling scheme or the second scheduling scheme, but not all of them.

The first scheduling scheme may be sent by the first device to the second device before the first device sends 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-specified by a wireless communication protocol. In the case of pre-agreement by the wireless communication protocol, both the first device and the second device automatically transmit the second reference signal using the second scheduling scheme according to the agreement after the second device sends the first error indication.

The first scheduling scheme and the second scheduling scheme also respectively indicate frequency domain resources used for sending the data signal, that is, the above-mentioned frequency band for sending the data signal. Since the third scheduling scheme is carried in the scheduling adjustment information, it does not re-indicate the frequency band for sending the data signal. After receiving the scheduling adjustment information, the second device will naturally resend the data signal on the second frequency band according to the third scheduling scheme.

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

506. 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; the signal can be repeated according to the methods described in steps 501 to 505 above pass.

If the number of times the first device sends the first error indication reaches a preset threshold, the second device no longer receives the first error indication. 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 signal retransmission may also include the following step 500 not shown in the figure:

500. 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;

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 sends the second reference signal using RI and PMI used by the second device when sending the first reference signal;

If the data signal includes a plurality of independent data blocks, and the first device does not correctly receive some of the data blocks in the data signal, the second device sends the second reference signal using the same Different PI and PMI when the second device sends the first reference signal.

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

In another application scenario, the above-mentioned second scheduling scheme may be different from the first scheduling scheme, and the second frequency band may also be different from the first frequency band.

In particular, 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, then when the second device continues to receive the The first error indication sent during the data signal, such as the Mth first error indication, specifically includes the following sub-steps X01 to sub-steps X03 not shown in the figure:

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

X02. The second device receives scheduling adjustment information determined according to the Qth reference signal sent by the first device, and determines a P+1th scheduling scheme for sending the data signal according to the scheduling adjustment information ;

X03. The second device sends the data signal to the first device on the Nth frequency band according to the P+1th scheduling scheme;

Wherein, P is a positive integer greater than 3, N and Q are positive integers greater than 2, and the frequency band used by the second device to retransmit the data signal does not overlap with the frequency band used to transmit the data signal before.

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, then 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, then the second reference signal is a CSI-RS.

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

According to another aspect of the embodiment of the present invention, the embodiment of the present invention also provides a communication device, as shown in FIG. 6 , the communication device includes: a sending unit 61 and a receiving unit 62;

Wherein, the receiving unit 62 is configured to receive a data signal sent by another device on the first frequency band according to a first scheduling scheme, and the first scheduling scheme is used to instruct the other device to send 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, and the first error indication is used to indicate that the other device the device resends the data signal;

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

The sending unit 61 is configured to send scheduling adjustment information determined according to the second reference signal to the other device after the receiving unit 62 receives the second reference signal, where the scheduling adjustment information is used to indicate The other device determines a third schedule for sending the data signal;

The receiving unit 62 is configured to receive, on the second frequency band, the data signal sent by the other device according to the third scheduling scheme after the sending unit 61 sends the scheduling adjustment information.

In a possible implementation scenario, the above-mentioned second scheduling scheme is the same as the above-mentioned first scheduling scheme, and the above-mentioned second frequency band is the same as the above-mentioned first frequency band; The data signal is retransmitted on the frequency band.

In the second possible implementation scenario, the above-mentioned second scheduling scheme is different from the above-mentioned first scheduling scheme, and the above-mentioned second frequency band is different from the above-mentioned first frequency band; that is, another device may be on the new frequency band The data signal is retransmitted using another scheduling scheme.

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:

Sending power information, modulation mode information, coding rate information, redundancy version used when the other device sends the data signal, information about whether the other device uses a frequency hopping mode to send the data signal, and the like.

In an optional application scenario, the sending unit 61 is further configured to continue sending the data signal to the other device when the receiving unit 62 still fails to correctly receive the data signal sent by the other device. The first error indication until the number of times the sending unit 61 sends the first error indication reaches a preset threshold.

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

Furthermore, when the data signal includes a plurality of independent data blocks, and the receiving unit 62 fails to correctly receive any data block in the data signal, the RI in the second reference signal received by the receiving unit 62, The PMI is the same as the RI and PMI in the first reference signal received by the receiving unit;

When the data signal includes multiple independent data blocks, and the receiving unit 62 fails to correctly receive some of the data blocks in the data signal, the RI, PMI and The RI and PMI in the first reference signal received by the receiving unit are different.

In the above-mentioned second possible implementation scenario, the sending unit 61 is further configured to send the Mth a second first error indication, 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 sent by the other device according to the Pth scheduling scheme after the sending unit 61 sends the Mth first error indication;

The sending unit 61 is further configured to send scheduling adjustment information determined according to the Qth reference signal to the other device after the receiving unit 62 receives the Qth reference signal, and the scheduling adjustment information is used for instructing the other device to determine a P+1th scheduling scheme for sending the data signal;

The receiving unit 62 is further configured to receive, on the Nth frequency band, the data signal sent by the other device according to the P+1th scheduling scheme after the sending unit 61 sends the scheduling adjustment information ;

Wherein, M takes a positive integer greater than 1, P takes a positive integer greater than 3, N and Q take a positive integer greater than 2, and the frequency band used by the other device to retransmit the data signal is the same as the frequency band used to send the data signal before The frequency bands are not repeated. When the above-mentioned M changes, P, N, and Q change in sequence.

In practical applications, the above-mentioned communication device may be a network device or a user device, specifically, the communication device is a network device, the other 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 in this embodiment can improve the reliability of the data signal transmission of another device by interacting with another device, solve the problem in the prior art that the reliability of the data signal is reduced during retransmission, and at the same time improve the signal transmission s efficiency.

According to another aspect of the embodiment of the present invention, the embodiment of the present invention also provides a communication device. As shown in FIG. 7 , the communication device in this embodiment includes: a receiving unit 71 and a sending unit 72;

Wherein, the sending unit 72 is configured to send a data signal to another device on the first frequency band according to a first scheduling scheme, and the first scheduling scheme is used to instruct the communication device to send the data signal on the first frequency band;

The receiving unit 71 is configured to, after the sending unit 72 sends the data signal, receive a first error indication sent by the other device when the data signal sent by the communication device is not correctly received, the first error indication for instructing the communication device to resend the data signal;

The sending unit 72 is further configured to, after the receiving unit 71 receives the first error indication, in response to the first error indication, according to a second scheduling scheme, send the the second reference signal;

The receiving unit 71 is configured to receive the scheduling adjustment information determined according to the second reference signal sent by the other device after the sending unit 72 sends the second reference signal, and adjust the information according to the scheduling adjustment information. determining a third schedule for sending the data signal;

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

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

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

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

Sending power information, modulation mode information, coding rate information, redundancy version used when the communication device sends the data signal, and information about whether the communication device uses a frequency hopping mode to send the data signal.

Of course, the receiving unit 71 is also configured to continue to receive 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 receiving the first error indication reaches a preset number of times. threshold. That is, after the number of times of receiving the first error indication reaches the threshold, the receiving unit 71 may stop receiving the first error indication.

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

At this time, if the data signal includes multiple independent data blocks, and the other device does not correctly receive any data block in the data signal, when the sending unit 72 sends the second reference signal using the RI and PMI 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 some data blocks in the data signal, the sending unit 72 uses the same method as the second reference signal when sending the second reference signal. Different PI and PMI when the sending unit sends the first reference signal.

In the above second possible implementation scenario, the above-mentioned sending unit 72 is further configured to receive the first data signal sent by the other device when the receiving unit 71 continues to receive the data signal sent by the communication device incorrectly. In case of an error indication, in response to the first error indication, according to the Pth scheduling scheme, send the Qth reference signal to the other device on the Nth frequency band;

The receiving unit 71 is further configured to, after the sending unit 72 sends the Qth reference signal, receive scheduling adjustment information sent by the other device and determined according to the Qth reference signal, and adjust according to the scheduling The information determines the P+1th scheduling scheme for sending the data signal;

The sending unit 72 is further configured to send the data to the other device on the Nth frequency band according to the P+1th scheduling scheme after the receiving unit 71 determines the P+1th scheduling scheme Signal;

Wherein, P is a positive integer greater than 3, N and Q are positive integers greater than 2, and the frequency band used by the communication device to retransmit the data signal does not overlap with the frequency band used to transmit the data signal before.

In a specific application, the aforementioned communication device may be a UE, or a network device such as a base station. Specifically, the communication device may be a user equipment UE, the other device may be a network device, and the second reference signal is 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.

The communication device in this embodiment can improve the reliability of the data signal transmission of another device by interacting with another device, solve the problem in the prior art that the reliability of the data signal is reduced during retransmission, and at the same time improve the signal transmission s efficiency.

It should be noted that, in the above embodiment of the communication device, the division of each functional unit is only an example. In actual application, the above function allocation can be done according to needs, such as the configuration requirements of corresponding hardware or the convenience of software implementation. Different functional units are completed, that is, the internal structure of the communication device is divided into different functional units, so as to complete all or part of the functions described above. Moreover, in practical applications, the corresponding functional units in this embodiment may be implemented by corresponding hardware, and may also be completed by corresponding hardware executing corresponding software. For example, the aforementioned sending unit may have the function of executing the aforementioned sending unit hardware, such as a transmitter, may also be a general processor or other hardware device capable of executing a corresponding computer program to complete the aforementioned functions; for another example, the aforementioned receiving unit may be hardware capable of executing the aforementioned receiving unit function, such as a receiver , may also be a general processor or other hardware device capable of executing a corresponding computer program to complete the foregoing functions; (the foregoing description principles can be applied to each of the embodiments provided in this specification).

According to another aspect of the embodiment of the present invention, the embodiment of the present invention also provides a communication device. The communication device in this embodiment includes: a memory and a processor, wherein the memory and the processor are coupled, and the memory is used for storing The information of the program routine executed by the processor, the processor is used to control the execution of the program routine; specifically, the processor is used to execute the functions realized by the sending unit 61 and the receiving unit 62 shown in FIG. 6 above, It includes a sending unit 61 and a receiving unit 6 , or the processor executes the functions realized by the sending unit 72 and receiving unit 71 shown in FIG. 7 , which includes the sending unit 72 and the receiving unit 71 . Both the memory and the processor can be implemented by logic integrated circuits.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by program instructions and related hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (28)

1. A method for signal retransmission, comprising: The first device receives, on the first frequency band, a data signal sent by the second device according to a first scheduling scheme, where the first scheduling scheme is used to instruct the second device to send the data signal on the first frequency band; When the first device does not correctly receive the data signal sent by the second device, send a first error indication to the second device, where the first error indication is used to instruct the second device to resend the data signal; The first device receives, on the second frequency band, the second reference signal sent by the second device according to a second scheduling scheme after receiving the first error indication, and the second scheduling scheme is used to instruct the second device sending the second reference signal on a second frequency band; The first device sends to the second device scheduling adjustment information determined according to the second reference signal, where the scheduling adjustment information is used to instruct the second device to determine a third schedule for sending the data signal plan; The first device receives, on the second frequency band, the data signal sent by the second device according to the third scheduling scheme. 2. The method of claim 1, wherein, 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. 3. The method according to claim 1, wherein 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, redundancy version used when the second device sends the data signal, and information about whether the second device uses a frequency hopping mode to send the data signal. 4. The method according to claim 1, wherein after the first device receives the data signal sent by the second device according to the third scheduling scheme on the second frequency band, further comprising: : If the first device still fails to 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 first device sends The number of times of the first error indication reaches a preset threshold. 5. The method according to any one of claims 1 to 4, wherein the first device, before receiving the data signal sent by the second device according to the first scheduling scheme on the first frequency band, further comprises: 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 includes a plurality of independent data blocks, and the first device does not correctly receive any data block in the data signal, the number of transmission layers in the second reference signal received by the first device indicating that the RI and the precoding matrix indicating PMI are the same as the RI and PMI in the first reference signal received by the first device; If the data signal includes multiple independent data blocks, and the first device does not correctly receive some of the data blocks in the data signal, then the RI, PMI and The RI and PMI in the first reference signal received by the first device are different. 6. The method according to claim 4, wherein if the first device still fails to correctly receive the data signal sent by the second device, the first device continues to send The second device sends a first error indication, including: When the first device fails to correctly receive the data signal sent by the second device, it sends an Mth first error indication to the second device, and the first error indication is used to indicate that the second device resending said data signal; The first device receives the Qth reference signal sent by the second device according to the Pth scheduling scheme on the Nth frequency band; The first device sends to the second device scheduling adjustment information determined according to the Qth reference signal, where the scheduling adjustment information is used to instruct the second device to determine the P+th 1 scheduling plan; receiving, by the first device, the data signal sent by the second device according to the P+1th 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 and Q are positive integers greater than 2, and the frequency band used by the second device to retransmit the data signal is the same as that used for sending the data signal before The frequency bands are not repeated. 7. The method according to any one of claims 1 to 4, characterized in that, 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, If the first device is a user equipment UE and the second device is a network device, the second reference signal is a channel state information-reference signal CSI-RS. 8. A method for signal retransmission, comprising: The second device sends a data signal to the first device on the first frequency band according to a first scheduling scheme, where the first scheduling scheme is used to instruct the second device to send the data signal 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, and the first error indication is used to instruct the second device to resend the data signal ; In response to the first error indication, the second device sends a second reference signal to the first device on a second frequency band according to a second scheduling scheme, where the second scheduling scheme is used to instruct the second device sending the second reference signal on a second frequency band; The second device receives scheduling adjustment information determined according to the second reference signal sent by the first device, and determines a third scheduling scheme for sending the data signal according to the scheduling adjustment information; The second device sends the data signal to the first device on the second frequency band according to the third scheduling scheme. 9. The method of claim 8, wherein 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. 10. The method according to claim 8, wherein 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, redundancy version used when the second device sends the data signal, and information about whether the second device uses a frequency hopping mode to send the data signal. 11. The method according to any one of claims 8 to 10, wherein the second device sends the data signal to the first device on the second frequency band according to the third scheduling scheme After that, also include: 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, until the number of times of receiving the first error indication reaches a preset threshold. 12. The method according to any one of claims 8 to 10, wherein the second device, before sending a data signal to the first device on the first frequency band according to the first scheduling scheme, further includes: 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 first device. Two equipment; 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 sends the second reference signal using the The transmission layer number indicator RI and the precoding matrix indicator PMI used when the second device sends the first reference signal; If the data signal includes a plurality of independent data blocks, and the first device does not correctly receive some of the data blocks in the data signal, the second device sends the second reference signal using the same Different PI and PMI when the second device sends the first reference signal. 13. The method according to claim 11, wherein 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, including : In response to the first error indication, the second device sends a Qth reference signal to the first device on the Nth frequency band according to the Pth scheduling scheme; The second device receives scheduling adjustment information determined according to the Qth reference signal sent by the first device, and determines a P+1th scheduling scheme for sending the data signal according to the scheduling adjustment information; The second device sends the data signal to the first device on the Nth frequency band according to the P+1th scheduling scheme; Wherein, P is a positive integer greater than 3, N and Q are positive integers greater than 2, and the frequency band used by the second device to retransmit the data signal does not overlap with the frequency band used to transmit the data signal before. 14. The method according to any one of claims 8 to 10, characterized in that, 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, If the first device is a user equipment UE and the second device is a network device, the second reference signal is a channel state information-reference signal CSI-RS. 15. A communication device, comprising: a receiving unit, configured to receive, on a first frequency band, a data signal sent by another device according to a first scheduling scheme, where the first scheduling scheme is used to instruct the other device to send the data signal on a 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, and the first error indication is used to indicate the other device resending said data signal; The receiving unit is configured to receive, on the second frequency band, the second reference sent by the other device according to the second scheduling scheme after receiving the first error indication after the sending unit sends the first error indication a signal, the second scheduling scheme is used to instruct the other device to send the second reference signal on a second frequency band; The sending unit is configured to, after the receiving unit receives the second reference signal, send scheduling adjustment information determined according to the second reference signal to the other device, where the scheduling adjustment information is used to indicate the The other device determines a third scheduling scheme for sending the data signal; The receiving unit is configured to receive, on the second frequency band, the data signal sent by the other device according to the third scheduling scheme after the sending unit sends the scheduling adjustment information. 16. The communication device of claim 15, wherein: 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. 17. The communication device according to claim 15, wherein 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, redundancy version used when the other device sends the data signal, and information about whether the other device uses a frequency hopping mode to send the data signal. 18. The communication device according to claim 15, wherein the sending unit is further configured to, when the receiving unit still fails to correctly receive the data signal sent by the other device, continue to send the data signal to the The other device sends the first error indication until the number of times the sending unit sends the first error indication reaches a preset threshold. 19. The communication device according to any one of claims 15 to 18, wherein the receiving unit is also used to Before receiving a data signal sent by another device according to the first scheduling scheme on the first frequency band, further receiving a first reference signal sent 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 includes a plurality of independent data blocks, and the receiving unit does not correctly receive any data block in the data signal, the transmission layer number indication RI in the second reference signal received by the receiving unit , the precoding matrix indicates that the PMI is 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 does not correctly receive some data blocks in the data signal, the RI and PMI in the second reference signal received by the receiving unit and the The RI and PMI in the first reference signal received by the receiving unit are different. 20. The communication device of claim 18, wherein The sending unit is further configured to send an Mth first error indication to the other device when the receiving unit still fails to correctly receive the data signal sent by the other device, and the first error indication for instructing the other device to resend the data signal; The receiving unit is further configured to receive, on the Nth frequency band, the Qth reference signal sent by the other device according to the Pth scheduling scheme after the sending unit sends the Mth first error indication; The sending unit is further configured to, after the receiving unit receives the Qth reference signal, send scheduling adjustment information determined according to the Qth reference signal to the other device, where the scheduling adjustment information is used to indicate The other device determines a P+1th scheduling scheme for sending the data signal; The receiving unit is further configured to receive, on the Nth frequency band, the data signal sent by the other device according to the P+1th scheduling scheme after the sending unit sends the scheduling adjustment information; Wherein, M takes a positive integer greater than 1, P takes a positive integer greater than 3, N and Q take a positive integer greater than 2, and the frequency band used by the other device to retransmit the data signal is the same as the frequency band used to send the data signal before The frequency bands are not repeated. 21. The communication device according to any one 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, The communication device is a user equipment UE, the other device is a network device, and the second reference signal is a channel state information-reference signal CSI-RS. 22. A communication device, comprising: A sending unit, configured to send a data signal to another device on a first frequency band according to a first scheduling scheme, where the first scheduling scheme is used to instruct the communication device to send the data signal on the first frequency band; a receiving unit, configured to receive, after the sending unit sends the data signal, a first error indication sent by the other device when the data signal sent by the communication device is not correctly received, and the first error indication is used instructing the communication device to resend the data signal; The sending unit is further configured to, after the receiving unit receives the first error indication, respond to the first error indication, and according to a second scheduling scheme, send a second error message to the other device on a second frequency band. a reference signal, the second scheduling scheme is used to instruct the communication device to send the second reference signal on a second frequency band; The receiving unit is configured to receive scheduling adjustment information determined according to the second reference signal sent by the other device after the sending unit sends the second reference signal, and determine according to the scheduling adjustment information A third scheduling scheme for sending the data signal; The sending unit is configured to, after the receiving unit receives the scheduling adjustment information and determines a third scheduling scheme, according to the third scheduling scheme, send the information to the other device on the second frequency band the data signal. 23. The communication device of claim 22, wherein 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. 24. The communication device according to claim 22, wherein each of the first scheduling scheme, the second scheduling scheme, and the third scheduling scheme includes one or more of the following information kind: Sending power information, modulation mode information, coding rate information, redundancy version used when the communication device sends the data signal, and information about whether the communication device uses a frequency hopping mode to send the data signal. 25. The communication device according to any one of claims 22 to 24, wherein the receiving unit is further configured to continue to receive the data signal sent by the other device when the data signal sent by the communication device is not correctly received. the first error indication until the number of times of receiving the first error indication reaches a preset threshold. 26. The communication device according to any one of claims 22 to 24, wherein the sending unit is further configured to, before sending a data signal to another device on the first frequency band according to the first scheduling scheme, send The other device sends a first reference signal, so that the other device determines a first scheduling scheme according to the first reference signal, and sends the first scheduling scheme to 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 uses the sending method when sending the second reference signal The transmission layer number indicator RI and the precoding matrix indicator PMI used when the 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 some data blocks in the data signal, the sending unit uses the same method as the sending unit when sending the second reference signal. Different PI and PMI when the units send the first reference signal. 27. The communication device of claim 25, wherein The sending unit is further configured to respond to the first error indication when the receiving unit continues to receive the first error indication sent by the other device when the data signal sent by the communication device is not received correctly, Sending 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 determined according to the Qth reference signal sent by the other device after the sending unit sends the Qth reference signal, and adjust the information according to the scheduling adjustment information determining the P+1th scheduling scheme for sending the data signal; The sending unit is further configured to send the data signal to the other device on the Nth frequency band according to the P+1th scheduling scheme after the receiving unit determines the P+1th scheduling scheme ; Wherein, P is a positive integer greater than 3, N and Q are positive integers greater than 2, and the frequency band used by the communication device to retransmit the data signal does not overlap with the frequency band used to transmit the data signal before. 28. The communication device according to any one of claims 22 to 24, characterized in that, The communication device is a user equipment UE, the other device is a network device, 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 a channel state information-reference signal CSI-RS.