CN111865503A

CN111865503A - Method and equipment for sending and receiving feedback information

Info

Publication number: CN111865503A
Application number: CN201910360645.9A
Authority: CN
Inventors: 刘德平
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-10-30
Also published as: WO2020221247A1

Abstract

The application relates to a method and equipment for sending and receiving feedback information, wherein the sending method comprises the following steps: the receiving equipment generates feedback information, wherein the feedback information comprises information of a data packet to be fed back in the data packet which is not received by the receiving equipment, and the feedback information also comprises a first field, the first field carries information of a sequence number (n +1), and n is the sequence number of the latest data packet in the data packet indicated by the feedback information; the receiving device sends feedback information to the sending device. The first field included in the feedback information carries information of the sequence number (n +1), so that the receiving device does not need to determine which the next unreceived data packet is except the data packet indicated by the feedback information, but only needs to add the sequence number of the next data packet of the latest data packet in the data packets indicated by the feedback information to the feedback information, the workload of the receiving device is reduced, and the power consumption of the device is saved.

Description

Method and equipment for sending and receiving feedback information

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for sending and receiving feedback information.

Background

At present, after receiving a data packet, a receiving end device sends feedback information to a sending end device, if the data packet is successfully received, the feedback is not needed, and if the data packet is unsuccessfully received or temporarily not received, the information of the data packet which is unsuccessfully received or not received can be sent to the sending end device through the feedback information, and after the sending end device receives the feedback information, the data packets can be retransmitted.

In the feedback information, a field of Acknowledgement (ACK) _ Sequence Number (SN) is included, and the field carries a sequence number of a next unreceived packet of the receiving device. For example, the data packets that the receiving end device does not receive are data packet 1, data packet 2, data packet 4, and data packet 7, while data packet 3, data packet 5, and data packet 6 are all received successfully. If the receiving end device needs to send the feedback information, the receiving end device may add the information of the data packet 1, the data packet 2, the data packet 4, and the data packet 7 to the feedback information. However, the feedback information has a limited capacity and may not accommodate the information of packet 1, packet 2, packet 4, and packet 7. The receiving end device adds the information of the data packet 1, the data packet 2, the data packet 4 and the data packet 7 to the feedback information in the sequence of the sequence number of the data packet, for example, after the information of the data packet 4 is added, the feedback information cannot contain more information, and therefore the information of the data packet 7 cannot be added to the feedback information. Then in the ACK _ SN field of the feedback information the sequence number of packet 7 is filled, e.g. 7.

In this way, although the receiving-end device cannot add the information of the packet 7 to the feedback information, the receiving-end device needs to determine which packet the next unreceived packet is in addition to the packets corresponding to the feedback information. Therefore, a further search process is required for the receiving end device, which is not favorable for saving power consumption.

Disclosure of Invention

The embodiment of the application provides a method and equipment for sending and receiving feedback information, which are used for saving the power consumption of the equipment.

In a first aspect, a method for sending feedback information is provided, where the method includes: the method comprises the steps that a receiving device generates feedback information, wherein the feedback information comprises information of a data packet to be fed back in the data packets which are not received by the receiving device, the feedback information also comprises a first field, the first field carries information of a sequence number (n +1), and n is the sequence number of the latest data packet in the data packets indicated by the feedback information. And the receiving equipment sends the feedback information to the sending equipment.

The method may be performed by a first communication device, which may be a communication apparatus or a communication device, such as a system-on-a-chip, capable of supporting the communication apparatus to implement the functionality required for the method. Illustratively, the communication device is a receiving device. Illustratively, the receiving device may be a terminal device or a network device.

In the embodiment of the present application, the first field included in the feedback information carries information of a sequence number (n +1), and n is a sequence number of the latest data packet in the data packets indicated by the feedback information. For example, the data packets that are not received by the receiving device are data packet 1, data packet 2, data packet 4 and data packet 7, while data packet 3, data packet 5 and data packet 6 are successfully received, and because the capacity of the feedback information is limited, the receiving device can only add the information of data packet 1, data packet 2 and data packet 4 to the feedback information, but the information of data packet 7 cannot be added to the feedback information. Then the first field of the feedback information carries information of the sequence number of packet 5 and not the sequence number of packet 7. In this way, the receiving device does not need to determine which of the next unreceived packets is, but only needs to add the sequence number of the next packet of the latest packet of the packets indicated by the feedback information to the feedback information, which reduces the workload of the receiving device and thus helps to save the power consumption of the device.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the first field is an acknowledgement sequence number field.

That is, the first field may be an ACK _ SN field. Of course, the implementation of the first field is not limited in this embodiment of the application, and the first field may also be another existing field or an additional field.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the feedback information includes information of a data packet to be fed back in a data packet that is not received by the receiving device, and may include one of the following three cases:

the feedback information comprises a sequence number of a first data packet to be fed back in data packets which are not received by the receiving equipment; or,

the feedback information comprises a serial number of a second data packet to be fed back in data packets which are not received by the receiving equipment, and start position information and end position information of sub data packets which are not received in the second data packet; or,

the feedback information includes a sequence number of a first data packet to be fed back in data packets not received by the receiving device, and includes a sequence number of a second data packet to be fed back in data packets not received by the receiving device, and start position information and end position information of sub data packets not received in the second data packet.

The capacity of one data packet may be relatively large, and when receiving the data packet, the receiving device may receive the whole data packet successfully or fail to receive the whole data packet, or may receive part of the content of the data packet successfully and receive the rest of the content of the data packet unsuccessfully. Then, if the receiving device fails to receive the whole data packet, the receiving device only needs to add the sequence number of the data packet to the feedback information, and the data packet can be indicated through the sequence number. Alternatively, if the receiving device successfully receives a part of the content of a packet and the remaining part of the content fails to receive, the receiving device may add the sequence number of the packet and the location information (the start location information and the end location information) of the part that failed to receive to the feedback information, so that the sending device can clearly identify which part of the packet the receiving device failed to receive, indicating clearly.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the second data packet includes a plurality of non-received discontinuous sub-packets, and each sub-packet of the plurality of non-received discontinuous sub-packets is indicated by a sequence number of the second data packet and start position information and end position information of each sub-packet.

With reference to the second possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the unreceived subpackets are multiple discontinuous subpackets, the start position information includes start position information of each subpacket in the unreceived subpackets, and the end position information includes end position information of each subpacket in the unreceived subpackets.

If the receiving device does not receive a plurality of discontinuous portions of the second data packet (each portion is regarded as one sub-packet) for the second data packet, the receiving device may add the start position information and the end position information of each portion that is not received to the feedback information, so that the sending device can more clearly determine which contents of the second data packet the receiving device fails to receive at all.

With reference to the first aspect or any possible implementation manner of the first aspect to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the information of the sequence number (n +1) is used to indicate a reception status of a packet with the sequence number (n +1), where the reception status of the packet includes successful reception or non-reception.

The sequence number (n +1) included in the first field may be used to indicate a reception status of the data packet having the sequence number (n +1), so that the transmitting apparatus may determine the reception status of the data packet having the sequence number (n +1) as successful reception or non-reception according to the first field. Alternatively, the sequence number (n +1) included in the first field may not indicate the reception status of the packet, and the transmitting device does not determine the reception status of the packet with the sequence number (n +1) according to the sequence number (n +1) included in the first field. The details are not intended to be limiting.

In a second aspect, a method for receiving feedback information is provided, the method comprising: the sending equipment receives feedback information from the receiving equipment; the sending device determines information of a data packet to be fed back in data packets which are not received by the receiving device according to the feedback information, and the feedback information further includes a first field, the first field carries information of a sequence number (n +1), and n is a sequence number of the latest data packet in the data packets indicated by the feedback information.

The method may be performed by a second communication device, and the first communication device may be a communication apparatus or a communication device capable of supporting a communication apparatus to implement the functions required by the method, such as a system-on-a-chip. Illustratively, the communication device is a transmitting device. Illustratively, the sending device may be a terminal device or a network device.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the first field is an acknowledgement sequence number field.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the determining, by the sending device, information of a data packet to be fed back in data packets that are not received by the receiving device according to the feedback information includes one of:

the sending equipment determines the sequence number of a first data packet to be fed back in the data packets which are not received by the receiving equipment according to the feedback information; or,

the sending equipment determines a serial number of a second data packet to be fed back in the data packets which are not received by the receiving equipment, and initial position information and end position information of sub data packets which are not received in the second data packet according to the feedback information; or,

and the sending equipment determines the sequence number of a first data packet to be fed back in the data packets which are not received by the receiving equipment according to the feedback information, and the sequence number of a second data packet to be fed back in the data packets which are not received by the receiving equipment, and the start position information and the end position information of the sub data packet which is not received in the second data packet.

With reference to the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the second data packet includes a plurality of non-received discontinuous sub-packets, and each sub-packet of the plurality of non-received discontinuous sub-packets is indicated by a sequence number of the second data packet and start position information and end position information of each sub-packet.

With reference to the second possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the unreceived subpackets are discontinuous subpackets, the start position information includes start position information of each subpacket in the unreceived subpackets, and the end position information includes end position information of each subpacket in the unreceived subpackets.

With reference to the second aspect or any possible implementation manner of the first possible implementation manner of the second aspect to the fourth possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, the information of the sequence number (n +1) is used to indicate a reception status of a data packet with a sequence number (n +1), where the reception status of the data packet includes successful reception or non-reception.

With regard to the technical effects brought by the second aspect or various possible embodiments of the second aspect, reference may be made to the introduction of the technical effects of the first aspect or the corresponding embodiments of the first aspect, which is not repeated herein.

In a third aspect, a first communication device is provided, for example, the first communication device as described above. The communication device is configured to perform the method of the first aspect or any possible implementation manner of the first aspect. In particular, the communication device may comprise means, for example comprising a processing means and a transceiver means, for performing the method of the first aspect or any possible implementation manner of the first aspect. Illustratively, the communication device is a receiving device. Illustratively, the receiving device may be a terminal device or a network device. Wherein,

the processing module is configured to generate feedback information, where the feedback information includes information of a data packet to be fed back in a data packet that is not received by the communication apparatus, and the feedback information further includes a first field, where the first field carries information of a sequence number (n +1), and n is a sequence number of a latest data packet in the data packet indicated by the feedback information;

And the transceiver module is used for transmitting the feedback information to the transmitting equipment.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the first field is an acknowledgement sequence number field.

With reference to the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the feedback information includes information of a data packet to be fed back in a data packet that is not received by the communication device, and may include one of the following three cases:

the feedback information comprises a sequence number of a first data packet to be fed back in data packets which are not received by the communication device; or,

the feedback information comprises a sequence number of a second data packet to be fed back in data packets which are not received by the communication device, and start position information and end position information of sub data packets which are not received in the second data packet; or,

the feedback information comprises a sequence number of a first data packet to be fed back in data packets not received by the communication device, and comprises a sequence number of a second data packet to be fed back in the data packets not received by the communication device, and start position information and end position information of sub data packets not received in the second data packet.

With reference to the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the second data packet includes a plurality of non-received discontinuous sub-packets, and each sub-packet of the plurality of non-received discontinuous sub-packets is indicated by a sequence number of the second data packet and start position information and end position information of each sub-packet.

With reference to the second possible implementation manner of the third aspect, in a fourth possible implementation manner of the third aspect, the unreceived sub packet is a plurality of discontinuous sub packets, the start position information includes start position information of each sub packet in the unreceived sub packet, and the end position information includes end position information of each sub packet in the unreceived sub packet.

With reference to the third aspect or any possible implementation manner of the first possible implementation manner of the third aspect to the fourth possible implementation manner of the third aspect, in a fifth possible implementation manner of the third aspect, the information of the sequence number (n +1) is used to indicate a reception status of a packet with the sequence number (n +1), where the reception status of the packet includes successful reception or non-reception.

With regard to the technical effects brought by the third aspect or various possible embodiments of the third aspect, reference may be made to the introduction of the technical effects of the first aspect or the corresponding embodiments of the first aspect, and details are not repeated.

In a fourth aspect, a second communication device is provided, for example a second communication device as described above. The communication device is configured to perform the method of the second aspect or any possible implementation manner of the second aspect. In particular, the communication device may comprise means for performing the method of the second aspect or any possible implementation manner of the second aspect, for example comprising a processing means and a transceiver means. Illustratively, the communication device is a transmitting apparatus. Illustratively, the sending device may be a terminal device or a network device. Wherein,

the transceiver module is used for receiving feedback information from the receiving equipment;

the processing module is configured to determine, according to the feedback information, information of a data packet to be fed back in data packets that are not received by the receiving device, and the feedback information further includes a first field, where the first field carries information of a sequence number (n +1), and n is a sequence number of a latest data packet in the data packets indicated by the feedback information.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the first field is an acknowledgement sequence number field.

With reference to the fourth aspect or the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the processing module is configured to determine, according to the feedback information, information of a data packet to be fed back in a data packet that is not received by the receiving device, by one of:

determining a sequence number of a first data packet to be fed back in data packets which are not received by the receiving equipment according to the feedback information; or,

determining a sequence number of a second data packet to be fed back in data packets which are not received by the receiving equipment, and start position information and end position information of sub data packets which are not received in the second data packet according to the feedback information; or,

and determining a sequence number of a first data packet to be fed back in data packets which are not received by the receiving equipment according to the feedback information, and including a sequence number of a second data packet to be fed back in the data packets which are not received by the receiving equipment, and start position information and end position information of sub data packets which are not received in the second data packet.

With reference to the second possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the second data packet includes a plurality of non-received discontinuous sub-packets, and each sub-packet of the plurality of non-received discontinuous sub-packets is indicated by a sequence number of the second data packet and start position information and end position information of each sub-packet.

With reference to the second possible implementation manner of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the unreceived subpackets are discontinuous subpackets, the start position information includes start position information of each subpacket in the unreceived subpackets, and the end position information includes end position information of each subpacket in the unreceived subpackets.

With reference to the fourth aspect or any possible implementation manner of the first possible implementation manner of the fourth aspect to the fourth possible implementation manner of the fourth aspect, in a fifth possible implementation manner of the fourth aspect, the information of the sequence number (n +1) is used to indicate a reception status of a data packet with a sequence number (n +1), where the reception status of the data packet includes successful reception or non-reception.

With regard to the technical effects brought by the fourth aspect or various possible embodiments of the fourth aspect, reference may be made to the introduction of the technical effects of the second aspect or the corresponding embodiments of the second aspect, which is not repeated herein.

In a fifth aspect, a third communication device is provided, for example a third communication device as described above. The communication device comprises a processor and a transceiver coupled to each other for implementing the method as described in the third aspect or in various possible designs of the third aspect. Illustratively, the communication means is a chip provided in the communication device. Illustratively, the communication device is a receiving device. Illustratively, the receiving device may be a terminal device or a network device. Wherein, the transceiver is implemented by an antenna, a feeder, a codec, etc. in the communication device, for example, or, if the communication device is a chip disposed in the communication device, the transceiver is, for example, a communication interface in the chip, and the communication interface is connected with a radio frequency transceiving component in the communication device to implement transceiving of information by the radio frequency transceiving component. Wherein,

the processor is configured to generate feedback information, where the feedback information includes information of a data packet to be fed back in a data packet that is not received by the communication device, and the feedback information further includes a first field, where the first field carries information of a sequence number (n +1), and n is a sequence number of a latest data packet in the data packets indicated by the feedback information;

The transceiver is configured to send the feedback information to a sending device.

With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the first field is an acknowledgement sequence number field.

With reference to the fifth aspect or the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect, the feedback information includes information of a data packet to be fed back in a data packet that is not received by the communication device, and may include one of the following three cases:

With reference to the second possible implementation manner of the fifth aspect, in a third possible implementation manner of the fifth aspect, the second data packet includes a plurality of non-received discontinuous sub-packets, and each sub-packet of the plurality of non-received discontinuous sub-packets is indicated by a sequence number of the second data packet and start position information and end position information of each sub-packet.

With reference to the second possible implementation manner of the fifth aspect, in a fourth possible implementation manner of the fifth aspect, the unreceived subpackets are discontinuous subpackets, the start position information includes start position information of each subpacket in the unreceived subpackets, and the end position information includes end position information of each subpacket in the unreceived subpackets.

With reference to the fifth aspect or any possible implementation manner of the first possible implementation manner of the fifth aspect to the fourth possible implementation manner of the fifth aspect, in a fifth possible implementation manner of the third aspect, the information of the sequence number (n +1) is used to indicate a reception status of a packet with a sequence number (n +1), where the reception status of the packet includes successful reception or non-reception.

With regard to the technical effects brought by the fifth aspect or various possible embodiments of the fifth aspect, reference may be made to the introduction of the technical effects of the first aspect or the corresponding embodiments of the first aspect, and details are not repeated.

In a sixth aspect, a fourth communication device is provided, for example, the fourth communication device as described above. The communication device comprises a processor and a transceiver coupled to each other for implementing the method as described in the above fourth aspect or in various possible designs of the fourth aspect. Illustratively, the communication means is a chip provided in the communication device. Illustratively, the communication device is a transmitting device. Illustratively, the sending device may be a terminal device or a network device. Wherein, the transceiver is implemented by an antenna, a feeder, a codec, etc. in the communication device, for example, or, if the communication device is a chip disposed in the communication device, the transceiver is, for example, a communication interface in the chip, and the communication interface is connected with a radio frequency transceiving component in the communication device to implement transceiving of information by the radio frequency transceiving component. Wherein,

the transceiver is used for receiving feedback information from receiving equipment;

The processor is configured to determine, according to the feedback information, information of a data packet to be fed back in data packets that are not received by the receiving device, and the feedback information further includes a first field, where the first field carries information of a sequence number (n +1), and n is a sequence number of a latest data packet in the data packets indicated by the feedback information.

With reference to the sixth aspect, in a first possible implementation manner of the sixth aspect, the first field is an acknowledgement sequence number field.

With reference to the sixth aspect or the first possible implementation manner of the sixth aspect, in a second possible implementation manner of the fourth aspect, the processor is configured to determine, according to the feedback information, information of a data packet to be fed back in a data packet that is not received by the receiving device, by one of:

With reference to the second possible implementation manner of the sixth aspect, in a third possible implementation manner of the sixth aspect, the second data packet includes a plurality of non-received discontinuous sub-packets, and each sub-packet of the plurality of non-received discontinuous sub-packets is indicated by a sequence number of the second data packet and start position information and end position information of each sub-packet.

With reference to the second possible implementation manner of the sixth aspect, in a fourth possible implementation manner of the sixth aspect, the unreceived subpackets are discontinuous subpackets, the start position information includes start position information of each subpacket in the unreceived subpackets, and the end position information includes end position information of each subpacket in the unreceived subpackets.

With reference to the sixth aspect or any possible implementation manner of the first possible implementation manner of the sixth aspect to the fourth possible implementation manner of the sixth aspect, in a fifth possible implementation manner of the sixth aspect, the information of the sequence number (n +1) is used to indicate a reception status of a packet with a sequence number (n +1), where the reception status of the packet includes successful reception or non-reception.

With regard to the technical effects brought by the sixth aspect or various possible embodiments of the sixth aspect, reference may be made to the introduction of the technical effects of the second aspect or the corresponding embodiments of the second aspect, and details are not repeated.

In a seventh aspect, a fifth communication device is provided. The communication device may be the first communication device in the above method design. Illustratively, the communication means is a chip provided in the receiving device. Illustratively, the receiving device may be a terminal device or a network device. The communication device includes: a memory for storing computer executable program code; and a processor coupled with the memory. Wherein the program code stored by the memory comprises instructions that, when executed by the processor, cause the fifth communication device to perform the method of the first aspect or any one of the possible implementations of the first aspect.

Wherein, the fifth communication device may further comprise a communication interface, which may be a transceiver in the receiving apparatus, for example, implemented by an antenna, a feeder, a codec, etc. in the communication device, or, if the fifth communication device is a chip disposed in the receiving apparatus, the communication interface may be an input/output interface of the chip, for example, an input/output pin, etc.

In an eighth aspect, a sixth communications apparatus is provided. The communication device may be the second communication device in the above method design. Illustratively, the communication means is a chip provided in the transmitting device. Illustratively, the sending device may be a terminal device or a network device. The communication device includes: a memory for storing computer executable program code; and a processor coupled with the memory. Wherein the program code stored by the memory comprises instructions which, when executed by the processor, cause the sixth communication device to perform the method of the second aspect or any one of the possible embodiments of the second aspect.

Wherein the sixth communication means may further comprise a communication interface, which may be a transceiver in the sending device, for example, implemented by an antenna, a feeder, a codec, etc. in the communication means, or, if the sixth communication means is a chip provided in the sending device, the communication interface may be an input/output interface of the chip, for example, an input/output pin, etc.

A ninth aspect provides a communication system, which may include the first communication apparatus of the third aspect, the third communication apparatus of the fifth aspect, or the fifth communication apparatus of the seventh aspect, and include the second communication apparatus of the fourth aspect, the fourth communication apparatus of the sixth aspect, or the sixth communication apparatus of the eighth aspect.

A tenth aspect provides a computer storage medium having stored therein instructions that, when executed on a computer, cause the computer to perform the method of the first aspect or any one of the possible designs of the first aspect.

In an eleventh aspect, there is provided a computer storage medium having instructions stored thereon, which when run on a computer, cause the computer to perform the method as set forth in the second aspect or any one of the possible designs of the second aspect.

In a twelfth aspect, there is provided a computer program product comprising instructions stored thereon, which when run on a computer, cause the computer to perform the method of the first aspect or any one of the possible designs of the first aspect.

In a thirteenth aspect, there is provided a computer program product comprising instructions stored thereon, which when run on a computer, cause the computer to perform the method of the second aspect described above or any one of the possible designs of the second aspect.

In the embodiment of the present application, the first field included in the feedback information carries information of the sequence number (n +1), so that the receiving device does not need to determine which of the next unreceived data packets is except the data packet indicated by the feedback information, but only needs to add the sequence number of the next data packet of the latest data packet in the data packets indicated by the feedback information to the feedback information, thereby reducing the workload of the receiving device and helping to save the power consumption of the device.

Drawings

Fig. 1A is a schematic diagram of a protocol stack of a transmitting device and a receiving device according to an embodiment of the present application;

FIG. 1B is a diagram illustrating the structure of the count value of a packet;

FIG. 2 is an example of the PDCP layer receiving and ordering packets;

fig. 3A is a schematic view of an application scenario according to an embodiment of the present application;

fig. 3B is a schematic view of another application scenario according to the embodiment of the present application;

Fig. 4 is a flowchart of a method for sending and receiving feedback information according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram illustrating a portion of a data packet that is not received in the embodiment of the present application in a sequential manner;

FIG. 6 is a diagram illustrating a non-received portion of a data packet in an embodiment of the present application is discontinuous;

fig. 7 is a schematic diagram of feedback information in an embodiment of the present application;

fig. 8 is a schematic block diagram of a first receiving device provided in an embodiment of the present application;

fig. 9 is another schematic block diagram of a first receiving device according to an embodiment of the present application;

fig. 10 is a schematic block diagram of a first transmitting device according to an embodiment of the present application;

fig. 11 is another schematic block diagram of a first sending device according to an embodiment of the present application;

fig. 12 is a schematic block diagram of a communication device provided by an embodiment of the present application;

fig. 13 is another schematic block diagram of a communication device provided by an embodiment of the present application;

fig. 14 is a further schematic block diagram of a communication device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

Hereinafter, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

1) Terminal equipment, including equipment providing voice and/or data connectivity to a user, in particular, including equipment providing voice to a user, or including equipment providing data connectivity to a user, or including equipment providing voice and data connectivity to a user. For example, may include a handheld device having wireless connection capability, or a processing device connected to a wireless modem. The terminal device may communicate with a core network via a Radio Access Network (RAN), exchange voice or data with the RAN, or interact with the RAN. The terminal device may include a User Equipment (UE), a wireless terminal device, a mobile terminal device, a device-to-device communication (D2D) terminal device, a vehicle-to-all (V2X) terminal device, a machine-to-machine/machine-type communication (M2M/MTC) terminal device, an internet of things (internet of things) terminal device, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (IoT), a remote station (remote station), an access point (access point, AP), a remote terminal (remote), an access terminal (access terminal), a user terminal (user terminal), a user agent (user), or a user equipment (user), etc. For example, mobile telephones (or so-called "cellular" telephones), computers with mobile terminal equipment, portable, pocket, hand-held, computer-included mobile devices, and the like may be included. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. Also included are constrained devices, such as devices that consume less power, or devices that have limited storage capabilities, or devices that have limited computing capabilities, etc. Examples of information sensing devices include bar codes, Radio Frequency Identification (RFID), sensors, Global Positioning Systems (GPS), laser scanners, and the like.

By way of example and not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable equipment can also be called wearable smart device or intelligent wearable equipment etc. is the general term of using wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets, smart helmets, smart jewelry and the like for monitoring physical signs.

The various terminal devices described above, if located on a vehicle (e.g., placed in or installed in the vehicle), may be considered to be vehicle-mounted terminal devices, which are also referred to as on-board units (OBUs), for example.

In this embodiment, the terminal device may further include a relay (relay). Or, it is understood that any device capable of data communication with a base station may be considered a terminal device.

2) Network devices, including, for example, Access Network (AN) devices, such as base stations (e.g., access points), may refer to devices in AN access network that communicate with wireless terminal devices over one or more cells over AN air interface. Or, for example, a network device in vehicle-to-everything (V2X) technology is a Road Side Unit (RSU). Or, for example, the cloud device may also serve as the sending device, such as a cloud server or the like.

The base station may be configured to interconvert received air frames and IP packets as a router between the terminal device and the rest of the access network, which may include an IP network. The RSU may be a fixed infrastructure entity supporting the V2X application and may exchange messages with other entities supporting the V2X application. The network device may also coordinate attribute management for the air interface. For example, the network device may include an evolved Node B (NodeB or eNB or e-NodeB) in a Long Term Evolution (LTE) system or a long term evolution-advanced (LTE-a) system, or may also include a fifth generation mobile communication technology (the 5 th generation mobile communication technology) ^thgeneration, 5G) new radio interface (NR) system (also referred to as NR system for short), or may also include a Centralized Unit (CU) and a Distributed Unit (DU) in a Cloud RAN (Cloud RAN) system.

The receiving device described in the embodiments of the present application may be a terminal device, or may also be a network device. In the embodiment of the present application, the sending device for sending the data packet may also be a terminal device or a network device. For example, in one case, the sending device is a network device, the receiving device is a terminal device, or in another case, both the sending device and the receiving device are network devices, or in yet another case, both the sending device and the receiving device are terminal devices (for example, transmission is performed between the sending device and the receiving device through a Sidelink (SL)), or in yet another case, the sending device is a terminal device, and the receiving device is a network device, and so on, which are not limited specifically.

3) The terms "system" and "network" in the embodiments of the present application may be used interchangeably. "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

And, unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing a plurality of objects, and do not limit the sequence, timing, priority, or importance of the plurality of objects. For example, the first packet and the second packet are only for distinguishing different packets, and do not indicate differences in the contents, priorities, transmission orders, importance levels, and the like of the two packets.

The foregoing has described some of the noun concepts to which embodiments of the present application relate, and the following has described some features of the embodiments of the present application.

Referring to fig. 1A, a schematic diagram of a part of a protocol stack of a sending device and a receiving device is shown. In fig. 1A, both the transmitting device and the receiving device include a PDCP layer, an RLC layer, a MAC layer, and a physical layer (PHY). In addition, both the transmitting device and the receiving device also include an upper layer of the PDCP layer, and fig. 1A takes an example in which the upper layer of the PDCP layer is an IP/Transmission Control Protocol (TCP) layer. When the transmitting device transmits the data packet, the transmission sequence of the data packet is IP/TCP layer-PDCP layer-RLC layer-MAC layer-physical layer, and then the data packet is transmitted from the physical layer of the transmitting device to the physical layer of the receiving device. After the data packet arrives at the physical layer of the receiving device, the transmission sequence in the receiving device is physical layer-MAC layer, RLC layer, PDCP layer-IP/TCP layer. Such as the arc arrows in fig. 1A, are used to indicate the transmission path of the data packets.

In air interface transmission, each data packet has a corresponding number. The number of a packet may be formed by two parts, i.e., a Sequence Number (SN) and a Hyper Frame Number (HFN), which together form the number of the packet, or a count value of the packet. The PDCP layer of the transmitting device adds SNs to a data packet to be transmitted. Meanwhile, the transmitting device and the receiving device also need to maintain the same HFN. The sum of SN and HFN constitutes the packet count. The count value of the packet may also be referred to as a packet number, and the name of the feature is not limited in the embodiment of the present application. Referring to fig. 1B, a diagram of the structure of the count value of the data packet is shown.

Wherein, the sending device needs to maintain the total number of the sent SNs not to exceed half of the total number of the SNs so as to avoid causing frame number confusion. Likewise, the receiving device will also use half the SN total length as the receive window. The total number of SNs is the number of all values corresponding to the number of bits (bits) occupied by the SNs. For example, the number of bits of SN is 3, and 3 bits correspond to 8 values in total, and the total SN number is 8. The transmitting device needs to ensure that the total number of the transmitted SNs, which may be understood as the SNs corresponding to the data packet maintained in the transmission state in which the transmitting device has transmitted but has not received the response message (e.g., Acknowledgement (ACK)/Negative Acknowledgement (NACK)) fed back by the receiving device for the data packet, needs to be less than or equal to 4. For example, the transmitting device has transmitted data packet 0, data packet 1, data packet 2, and data packet 3, and has not received the response message fed back by the receiving device for these 4 data packets, so the transmitting device cannot transmit other data packets any more. Subsequently, for example, the transmitting device receives the ACK for packet 0 from the receiving device, and then a packet, for example, packet 4, may be transmitted.

In air interface transmission, although a transmitting device transmits data packets in sequence according to the numbers of the data packets, a Medium Access Control (MAC) layer supports a hybrid automatic repeat request (HARQ) mechanism, and the data packets received by a receiving device are likely to be out of order due to parallel operation of multiple HARQ processes. For AM, the Radio Link Control (RLC) layer supports an automatic repeat request (ARQ) mechanism, which also results in out-of-order packets received by the receiving device.

In the LTE system, the layer 2 protocol stack RLC in the receiving device is responsible for reordering the received out-of-order data packets and delivering the reordered data packets to an upper layer of the RLC layer, i.e., the PDCP layer. In the 5G NR system, the layer 2 protocol stack RLC no longer has a reordering function, but the layer 2 protocol stack PDCP (alternatively referred to as PDCP layer) in the receiving device is responsible for reordering out-of-order received packets.

After receiving a data packet, the PDCP layer of the receiving device first determines a COUNT value of the data packet according to the SN carried by the data packet and the HFN maintained by the receiving device, where the COUNT value of the data packet is represented by RCVD _ COUNT, for example. Then, the PDCP layer determines whether the count value of the packet is within a valid reception window, i.e., whether the count value of the packet is greater than or equal to RX _ DELIV and less than (RX _ DELIV + SN total/2). Wherein RX _ DELIV indicates the number of the first packet that the PDCP layer has not previously delivered to the upper layer. If it is determined that the count value of the packet is greater than or equal to RX _ DELIV and less than (RX _ DELIV + SN total/2), it is determined that the count value of the packet is within a valid time window and the PDCP layer may temporarily store the packet; alternatively, if it is determined that the count value of the packet is less than RX _ DELIV, or that the count value of the packet is less than (RX _ DELIV + SN total/2), or that the count value of the packet is less than both RX _ DELIV and (RX _ DELIV + SN total/2), it is determined that the count value of the packet is not within the valid time window, and the PDCP layer may discard the packet. For the buffered data packets, the PDCP layer may order them, or reorder them.

The PDCP layer sequences packets, and there are four variables involved:

RCVD _ COUNT: a count value indicating a currently received packet;

RX _ DELIV: the count value of the first packet not submitted to the upper layer of the PDCP layer is represented, wherein the first packet not submitted to the upper layer of the PDCP layer is understood to be the packet with the smallest count value among the packets not submitted to the upper layer by the PDCP layer;

RX _ NEXT: a count value indicating a currently expected next packet to be received, or a value indicating that a maximum count value in the currently received packet is increased by 1;

RX _ REORD: represents the value of RX _ NEXT at which the reordering timer (t-reordering timer) is turned on.

In the following, using fig. 2 as an example, how the PDCP layer sequences the data packets will be described.

The first row in fig. 2 indicates that the PDCP layer at the receiving end does not receive any packet, at this time, the value of RCVD _ COUNT and the value of RX _ REORD do not exist, the value of RX _ DELIV is 0, which indicates that the COUNT value of the first packet that is not currently delivered to the upper layer of the PDCP layer is 0, and the value of RX _ NEXT is 0, which indicates that the COUNT value of the NEXT packet to be received is currently expected to be 0, that is, the NEXT packet to be received is currently expected to be 0.

The second row of fig. 2 shows that the PDCP layer has received packet 0. The PDCP layer determines whether the count value of packet 0 is within a valid time window. The PDCP layer may determine whether the count value of the packet 0 is within the valid time window according to the value of the un-updated RX _ DELIV. For example, the PDCP layer determines that the count value of the packet 0 is within the valid time window, and temporarily stores the packet 0. NEXT, the PDCP layer determines whether RCVD _ COUNT is greater than or equal to RX _ NEXT, and if RCVD _ COUNT is greater than or equal to RX _ NEXT, RX _ NEXT needs to be updated. At this time, the value of RCVD _ COUNT is 0, and the value of RX _ NEXT before update is 0, then RCVD _ COUNT is equal to RX _ NEXT, so the value of RX _ NEXT is updated to RCVD _ COUNT +1, that is, the value of RX _ NEXT is updated to 1. As packet 0 is received and equal to the count value of the first packet not delivered to the upper layer, the PDCP layer delivers packet 0 to the upper layer, and when the count value of the first packet not delivered to the upper layer becomes 1, RX _ DELIV is updated to 1. In addition, the PDCP layer may further determine whether RX _ DELIV is greater than or equal to RX _ NEXT when the reordering timer is not running, and if RX _ DELIV is less than RX _ NEXT, it indicates that the received data packet is out of order. At this time, the value of RX _ DELIV and the value of RX _ NEXT are both 1, and thus it can be determined that no disorder exists. In the description of FIG. 2, the upper layer of the PDCP layer is the IP/TCP layer.

The third row of fig. 2 shows that the PDCP layer has received packet 3. The PDCP layer determines whether the count value of the packet 3 is within a valid time window. The PDCP layer may determine whether the count value of packet 3 is within the valid time window according to the value of RX _ DELIV that is not updated. For example, the PDCP layer determines that the count value of the packet 3 is within the valid time window, and temporarily stores the packet 3. NEXT, the PDCP layer determines whether RCVD _ COUNT is greater than or equal to RX _ NEXT, and if RCVD _ COUNT is greater than or equal to RX _ NEXT, RX _ NEXT needs to be updated. At this time, the value of RCVD _ COUNT is 3, and the value of RX _ NEXT before update is 1, then RCVD _ COUNT is greater than RX _ NEXT, so the PDCP layer can update the value of RX _ NEXT to RCVD _ COUNT +1, that is, update the value of RX _ NEXT to 4. At this time, if an out of order delivery (out of order delivery) function is configured for the PDCP layer, the PDCP layer may deliver the packet 3 to an upper layer, and at this time, the PDCP layer may not sequence the packet. Alternatively, if the out-of-order delivery function is not configured for the PDCP layer, the PDCP layer does not need to deliver the packet to the upper layer because the packet 1 is not received, and thus the value of RX _ DELIV is set to 1. In addition, the PDCP layer may further determine whether RX _ DELIV is greater than or equal to RX _ NEXT when the reordering timer is not running, and if RX _ DELIV is less than RX _ NEXT, it indicates that the received data packet is out of order. Since RX _ DELIV is less than RX _ NEXT 4, the PDCP layer may start the reordering timer and update the value of RX _ REORD to 4, so that the reordering timer runs to indicate that there is out-of-order. Herein, the case where the out-of-order delivery function is not configured for the PDCP layer is mainly described.

The fourth row of fig. 2 shows that the PDCP layer has received packet 5. The PDCP layer determines whether the count value of the packet 5 is within a valid time window. The PDCP layer may determine whether the count value of the packet 5 is within the valid time window according to the value of RX _ DELIV that is not updated (i.e., the value of RX _ DELIV is 1). For example, the PDCP layer determines that the count value of packet 5 is within the valid time window, and buffers packet 5 temporarily. NEXT, the PDCP layer determines whether RCVD _ COUNT is greater than or equal to RX _ NEXT, and if RCVD _ COUNT is greater than or equal to RX _ NEXT, RX _ NEXT needs to be updated. At this time, the value of RCVD _ COUNT is 5, and the value of RX _ NEXT before update is 4, then RCVD _ COUNT is greater than RX _ NEXT, so the PDCP layer can update the value of RX _ NEXT to RCVD _ COUNT +1, that is, update the value of RX _ NEXT to 6. At this time, since packet 1 is not received, RX _ DELIV still takes a value of 1, and no packet is delivered to the upper layer. In addition, when RX _ delay is greater than or equal to RX _ REORD while the reordering timer is running, the PDCP layer may start the reordering timer to indicate that the data packet which is not received and has a number less than RX _ REORD has been received. Since the reordering timer is running at this time, but RX _ DELIV is smaller than RX _ REORD by 1, it means that the missing packets are not completely received when the reordering timer is started.

The fifth row of fig. 2 shows that the PDCP layer has received packet 6. The PDCP layer determines whether the count value of the packet 6 is within a valid time window. The PDCP layer may determine whether the count value of the packet 6 is within the valid time window according to the value of RX _ DELIV that is not updated (i.e., the value of RX _ DELIV is 1). For example, the PDCP layer determines that the count value of the packet 6 is within the valid time window, and buffers the packet 6. NEXT, the PDCP layer determines whether RCVD _ COUNT is greater than or equal to RX _ NEXT, and if RCVD _ COUNT is greater than or equal to RX _ NEXT, RX _ NEXT needs to be updated. At this time, the value of RCVD _ COUNT is 6, and the value of RX _ NEXT before update is 6, then RCVD _ COUNT is equal to RX _ NEXT, so the PDCP layer can update the value of RX _ NEXT to RCVD _ COUNT +1, that is, update the value of RX _ NEXT to 7. At this time, since packet 1 is not received, RX _ DELIV still takes a value of 1, and no packet is delivered to the upper layer. In addition, when RX _ delay is greater than or equal to RX _ REORD while the reordering timer is running, the PDCP layer may start the reordering timer to indicate that the data packet which is not received and has a number less than RX _ REORD has been received. Since the reordering timer is running but RX _ delay is 1 smaller than RX _ REORD is 4, it means that the packets missing when the reordering timer is started are not completely received, i.e. the reordering timer is started to wait for receiving packet 1 and packet 2, and if the reordering timer is not timed out, the reordering timer will not be stopped and will continue to run.

The sixth row of fig. 2 shows that the PDCP layer has received packet 1. The PDCP layer determines whether the count value of the packet 1 is within a valid time window. The PDCP layer may determine whether the count value of packet 1 is within the valid time window according to the value of RX _ DELIV that is not updated (i.e., the value of RX _ DELIV is 1). For example, the PDCP layer determines that the count value of packet 1 is within the valid time window, and temporarily stores packet 1. NEXT, the PDCP layer determines whether RCVD _ COUNT is greater than or equal to RX _ NEXT, and if RCVD _ COUNT is greater than or equal to RX _ NEXT, RX _ NEXT needs to be updated. At this time, the value of RCVD _ COUNT is 1, the value of RX _ NEXT before update is 7, and then RCVD _ COUNT is smaller than RX _ NEXT, the value of RX _ NEXT does not need to be updated, and the value of RX _ NEXT is still 7. At this time, because the received packet is 1 and the value RX _ DELIV of the first non-received packet is equal, the packet No. 1 is submitted to the upper layer, and RX _ DELIV is updated to 2. In addition, when RX _ delay is greater than or equal to RX _ REORD while the reordering timer is running, the PDCP layer may start the reordering timer to indicate that the data packet which is not received and has a number less than RX _ REORD has been received. Since the reordering timer is running but RX _ delay 2 is smaller than RX _ REORD 4, it means that the packets missing when the reordering timer is started are not completely received, i.e. the starting reordering timer is to wait for receiving packet 1 and packet 2, and only packet 1 is received, and if the reordering timer is not timed out, the reordering timer will not be stopped and will continue to run.

The seventh row of fig. 2 shows that the PDCP layer has received packet 2. The PDCP layer determines whether the count value of packet 2 is within a valid time window. The PDCP layer may determine whether the count value of packet 2 is within the valid time window according to the value of RX _ DELIV that is not updated (i.e., the value of RX _ DELIV is 1). For example, the PDCP layer determines that the count value of packet 2 is within the valid time window, and buffers packet 2 temporarily. NEXT, the PDCP layer determines whether RCVD _ COUNT is greater than or equal to RX _ NEXT, and if RCVD _ COUNT is greater than or equal to RX _ NEXT, RX _ NEXT needs to be updated. At this time, the value of RCVD _ COUNT is 2, the value of RX _ NEXT before update is 7, and then RCVD _ COUNT is smaller than RX _ NEXT, the value of RX _ NEXT does not need to be updated, and the value of RX _ NEXT is still 7. At this time, since the received data packet is 2, which is equal to the value RX _ DELIV of the first unreceived data packet, the packet No. 2 and the consecutive packet No. 3 after the packet No. 2 are delivered to the upper layer, and the first unreceived data packet is updated to the unreceived packet No. 4, that is, RX _ DELIV is updated to 4. In addition, when RX _ delay is greater than or equal to RX _ REORD while the reordering timer is running, the PDCP layer may start the reordering timer to indicate that the data packet which is not received and has a number less than RX _ REORD has been received. Since the reordering timer is running but RX _ DELIV-4 equals RX _ REORD-4, it means that the missing packets are completely received when the reordering timer is started, and the reordering timer is stopped and reset. In the eighth row of fig. 2, it can also be determined whether RX _ DELIV is greater than or equal to RX _ NEXT because the PDCP layer is not running at the reordering timer, and if RX _ DELIV is less than RX _ NEXT, it indicates that the received packet is out of order. Since RX _ DELIV-4 is smaller than RX _ NEXT-7, the PDCP layer may start the reordering timer and update the value of RX _ REORD to 7. The reordering timer is started at this time to wait for the reception of the data packet 4. The values of the other variables are the same as those in the seventh row of fig. 2.

Fig. 2 is an example in which the PDCP layer receives packet 1 and packet 2 during the running time of the reordering timer. Alternatively, when the PDCP layer has not received packet 1 and packet 2, the reordering timer expires, and then the PDCP layer delivers packet 3 directly to the upper layer and updates the value of RX _ DELIV, and considers that packet 1 and packet 2 are lost. If the PDCP layer has subsequently received packet 1, since the PDCP layer has updated the value of RX _ DELIV, the count value of the subsequently received packet 1 is likely not within the valid time window, and the PDCP layer will discard packet 1, as well as packet 2. It can be seen that the PDCP layer may lose the data packet due to the timeout of the reordering timer.

The reception process for subsequent data packets may be analogized.

As described above, the PDCP reordering process is performed on the data packets, and the similar process is performed if the data packets are reordered by the RLC layer. However, for the RLC layer, the upper layer is the PDCP layer.

Currently, after receiving a data packet, a receiving device sends feedback information to a sending device. Wherein, if the data packet reception is successful, the feedback may not be necessary, and if the data packet reception fails or is not received temporarily, the information of the data packet reception failed or not received may be transmitted to the transmitting device through the feedback information. After receiving the feedback information, the transmitting device may retransmit the data packet indicated by the feedback information.

In the feedback information, an ACK _ SN field is included, which carries the sequence number of the next unreceived packet by the receiving device. For example, the packets that the receiving device did not receive are packet 1, packet 2, packet 4, and packet 7, while packet 3, packet 5, and packet 6 were all received successfully. Of course, the receiving device does not necessarily receive the

data packets

3, 5 and 6 sequentially, and if the data packets are not received sequentially, reordering may be performed after reception, and the specific reordering process may refer to the foregoing. If the receiving device needs to send feedback information, the receiving device may add the information of data packet 1, data packet 2, data packet 4, and data packet 7 to the feedback information. Taking the RLC layer of the receiving device to determine the feedback information as an example, for example, the RLC layer may carry the feedback information in an RLC Protocol Data Unit (PDU). However, the rlc pdu has a limited capacity, so that the capacity of the feedback information is also limited. The receiving device may add the information of the data packet 1, the data packet 2, the data packet 4, and the data packet 7 to the feedback information in the order of the sequence numbers of the data packets, for example, after the information of the data packet 4 is added, the feedback information cannot accommodate more information, and therefore the information of the data packet 7 cannot be added to the feedback information. Then in the ACK _ SN field of the feedback information the sequence number of packet 7, e.g. 7, may be filled in.

In this manner, although the receiving apparatus cannot add the information of the packet 7 to the feedback information, the receiving apparatus needs to determine which packet the next unreceived packet is in addition to the packets corresponding to the feedback information. Therefore, a further search process is required for the receiving end device, which is not favorable for saving power consumption.

In view of this, the technical solutions of the embodiments of the present application are provided. In the embodiment of the present application, the first field included in the feedback information carries information of a sequence number (n +1), and n is a sequence number of the latest data packet in the data packets indicated by the feedback information. For example, the data packets that are not received by the receiving device are data packet 1, data packet 2, data packet 4 and data packet 7, while data packet 3, data packet 5 and data packet 6 are successfully received, and because the capacity of the feedback information is limited, the receiving device can only add the information of data packet 1, data packet 2 and data packet 4 to the feedback information, but the information of data packet 7 cannot be added to the feedback information. Then the first field of the feedback information carries information of the sequence number of packet 5 and not the sequence number of packet 7. In this way, the receiving device does not need to determine which of the next unreceived packets is, but only needs to add the sequence number of the next packet of the latest packet of the packets indicated by the feedback information to the feedback information, which reduces the workload of the receiving device and thus helps to save the power consumption of the device.

The technical solution provided in the embodiments of the present application may be applied to an LTE system, for example, may be applied to a general LTE system or a vehicle networking system, for example, V2X, LTE-V, etc., or may also be applied to an NR system, for example, may be applied to a general NR system or a vehicle networking system, for example, V2X, NR-V, etc., or may also be applied to other similar communication systems or a next generation communication system.

Please refer to fig. 3A, which is an application scenario of the present application. Fig. 3A includes a network device and a terminal device. Wherein the network device operates in an evolved universal mobile telecommunications system terrestrial radio access (E-UTRA) system, for example, or in an NR system. Of course, in the embodiment of the present application, one network device may serve multiple terminal devices, and fig. 3A only exemplifies one terminal device. The network device may serve as a transmitting device and the terminal device as a receiving device, or the network device may serve as a receiving device and the network device as a transmitting device.

The network device in fig. 3A is, for example, a base station. The network device corresponds to different devices in different systems, for example, the network device may correspond to an eNB in a 4G system, and the network device corresponds to a network device in a 5G system, for example, a gNB in a 5G system. Fig. 3A illustrates that the network device is a base station, and actually, referring to the foregoing description, the network device may also be an RSU or the like. Of course, the technical solution provided in the embodiment of the present application may also be applied to a future mobile communication system, and therefore, the network device in fig. 3A may also correspond to an access network device in the future mobile communication system. The terminal device in fig. 3A is a mobile phone as an example, but is not limited thereto.

Please refer to fig. 3B, which is another application scenario of the present application. In fig. 3B, terminal device 1 and terminal device 2 are included, and these two terminal devices can communicate with each other through sidelink. The two terminal devices may be within the coverage of the same network device, or within the coverage of different network devices, or terminal device 1 may be within the coverage of one network device, while terminal device 2 is not within the coverage of either network device. Network devices such as base stations or RSUs, etc. The terminal device 1 and the terminal device 2 in fig. 3B are both exemplified by a vehicle, and are not limited thereto in practice.

In addition, the embodiments of the present application are not limited to the communication between the network device and the terminal device, or the communication between the terminal device and the terminal device, or the communication between the network device and the network device. For example, the sending device described in this embodiment may be a network device or a terminal device, and the receiving device described in this embodiment may be a network device or a terminal device, and the combination of the types of the sending device and the receiving device is not limited.

The technical scheme provided by the embodiment of the application is described below with reference to the accompanying drawings.

An embodiment of the present application provides a method for sending and receiving feedback information, please refer to fig. 4, which is a flowchart of the method. In the following description, the method is applied to the network architecture shown in fig. 3A or fig. 3B as an example. In addition, the method may be performed by two communication apparatuses, for example, a first communication apparatus and a second communication apparatus, where the first communication apparatus may be a network device or a communication apparatus capable of supporting the network device to implement the functions required by the method, or the first communication apparatus may be a terminal device or a communication apparatus capable of supporting the terminal device to implement the functions required by the method, and may of course be other communication apparatuses such as a system on chip. The same applies to the second communication apparatus, which may be a network device or a communication apparatus capable of supporting the network device to implement the functions required by the method, or a terminal device or a communication apparatus capable of supporting the terminal device to implement the functions required by the method, and of course, other communication apparatuses such as a system on a chip may also be used. The implementation manners of the first communication device and the second communication device are not limited, for example, the first communication device may be a network device, the second communication device is a terminal device, or both the first communication device and the second communication device are network devices, or both the first communication device and the second communication device are terminal devices, or the first communication device is a network device, and the second communication device is a communication device capable of supporting the terminal device to implement the functions required by the method, and so on. The network device is, for example, a base station.

For convenience of introduction, in the following, it is exemplified that the method is performed by a receiving device and a transmitting device, that is, it is exemplified that the first communication apparatus is the receiving device, the second communication apparatus is the transmitting device, and there is no limitation on whether the receiving device is a network device or a terminal device, and there is no limitation on whether the transmitting device is a network device or a terminal device. If the present embodiment is applied to the network architecture shown in fig. 3A, the receiving device described below may be a network device in the network architecture shown in fig. 3A, and the sending device described below may be a terminal device in the network architecture shown in fig. 3A, or the receiving device described below may be a terminal device in the network architecture shown in fig. 3A, and the sending device described below may be a network device in the network architecture shown in fig. 3A. Alternatively, if the present embodiment is applied to the network architecture shown in fig. 3B, the receiving device described below may be the terminal device 2 in the network architecture shown in fig. 3B, and the transmitting device described below may be the terminal device 1 in the network architecture shown in fig. 3B. Of course, in the embodiment of the present application, both the sending device and the receiving device may be network devices, and are not limited specifically.

S41, the receiving device generates feedback information, where the feedback information includes information of a data packet to be fed back in a data packet that is not received by the receiving device, and the feedback information further includes a first field, where the first field carries information of a sequence number (n +1), and n is a sequence number of a latest data packet in the data packet indicated by the feedback information.

As described above, each data packet has a corresponding number in air interface transmission. The number of a packet may consist of two parts, a sequence number and a hyper frame number. And the embodiment of the application mainly focuses on the sequence number of the data packet.

The sending device sends the data packet to the receiving device, and the receiving device may send the feedback information to the sending device periodically, or, if the sending device needs to receive the feedback information, may send the trigger information to the receiving device, and after the receiving device receives the trigger information from the sending device, the receiving device may also send the feedback information to the sending device. When the receiving device sends the feedback information to the sending device, the receiving device may have received the data packet, or may be in the process of receiving the data packet.

The data packet indicated by the feedback information may be understood that the feedback information includes information of the data packet, for example, the feedback information includes information of the data packet 1, and it may be considered that the feedback information indicates the data packet 1. Some of the data packets indicated by the feedback information may not be received yet, but may be subsequently received, or some of the data packets may be acknowledged and lost (e.g., may not be subsequently received, or even if subsequently received, the receiving device may discard the data packets as invalid because the valid time window has been exceeded). For these two cases, they are collectively referred to as "no reception" in the embodiment of the present application. That is to say, the "unreceived packet" described in the embodiment of the present application may include a packet that has not been received yet and may or may not be subsequently received, and may correspond to a packet whose reception status is uncertain, and may also include a packet whose reception status is confirmed to be lost.

For example, if the received data packets are out of order during the process of receiving the data packets, the RLC layer or PDCP layer of the receiving device may reorder the data packets. And if the receiving device needs to send the feedback information, the receiving device can generate the feedback information according to the result after reordering. For example, the transmitting device transmits packets 1 to 10, and the receiving device receives

packets

1, 2, 4, 7, and 10 in the following order: data packet 1-data packet 4-data packet 7-data packet 2-data packet 10, and at this time, the receiving device needs to send feedback information, for example, it may be that a period for sending feedback information arrives, or it receives trigger information from the sending device, and determines that the feedback information needs to be sent. Then the receiving device and also data packet 3, data packet 5, data packet 6, data packet 8 and data packet 9 are not received, so in principle, the feedback information sent by the receiving device can indicate data packet 3, data packet 5, data packet 6, data packet 8 and data packet 9, because data packet 1, data packet 2, data packet 4, data packet 7 and data packet 10 have been successfully received, so the receiving device does not need to indicate these data packets that have been successfully received through the feedback information.

The receiving device may add information of packet 3, information of packet 5, information of packet 6, information of packet 8, and information of packet 9 to the feedback information in sequence. The amount of feedback information is limited, and may not accommodate all the information of the several data packets, for example, after the receiving device has added the information of the data packet 6, the feedback information is already fully added, or although the feedback information is not fully added, the remaining area of the feedback information is not enough to add the information of the data packet 8, then the receiving device may stop adding, the feedback information is generated, and the feedback information indicates the data packet 3, the data packet 5, and the data packet 6, but cannot indicate the data packet 8 and the data packet 9.

In addition, the feedback information may include information of one or more data packets, or the feedback information may indicate one or more data packets. For the feedback information, n is the sequence number of the latest data packet in the data packets indicated by the feedback information, and "latest" here is the latest determined by the sequence number of the data packets.

If the sequence number of the data packet is incremented without limit, the latest data packet in the data packets indicated by the feedback information can be understood as the data packet with the largest sequence number in the data packets indicated by the feedback information. However, the sequence numbers of the data packets may not be incremented indefinitely, but are recycled, for example, the sequence numbers of the data packets are 1024 in total, then the next data packet after the data packet 1023 is not the data packet 1024 but the data packet 0 (or the next data packet after the data packet 1024 is not the data packet 1025 but the data packet 1), so that the latest data packet in the data packets indicated by the feedback information is not always the data packet with the largest sequence number in the data packets indicated by the feedback information. It should be understood only that, among the data packets indicated by the feedback information, if the data packets are received normally in the order of the sequence numbers of the data packets, the latest data packet among the data packets indicated by the feedback information should be the data packet received last by the receiving device among the data packets indicated by the feedback information.

For example, the receiving device does not receive the data packet 3, the data packet 5, the data packet 6, the data packet 8, and the data packet 9, and the receiving device adds the information including the data packet 3, the data packet 5, and the data packet 6 to the feedback information, so that the latest data packet in the data packets indicated by the feedback information is the data packet 6. For packet 3, packet 5, and packet 6, if the receiving device receives in the normal order, packet 6 should be the latest packet received by the receiving device of these 3 packets.

As another example, the receiving apparatus does not receive the packet 1021, the packet 1022, the packet 1023, the packet 0 and the packet 3, and the receiving apparatus adds the information of the packet 1021, the information of the packet 1022, the information of the packet 1023 and the information of the packet 0 to the feedback information, so that the latest packet in the packets indicated by the feedback information is the packet 0. For packet 1021, packet 1022, packet 1023, and packet 0, if the receiving device receives in the normal order, packet 0 should be the latest packet received by the receiving device of these 4 packets. Packet 0 is the next packet after packet 1023.

In addition, the feedback information may include a first field, which may carry information of the sequence number (n +1), in addition to information of the data packet. For example, the first field may carry the sequence number (n +1) itself, and the sequence number (n +1) carried in the first field may be in binary form, or in octal form, or in other binary forms, depending on the format of the feedback information. Or the first field may also carry indication information, which may indicate the sequence number (n +1), and is not limited specifically.

As an alternative, the first field may be an ACK _ SN field, or possibly other fields.

If according to the prior art, the ACK _ SN field in the feedback information carries the sequence number of the next unreceived data packet of the receiving device, except the data packet indicated by the feedback information. For example, the receiving device does not receive the data packet 3, the data packet 5, the data packet 6, the data packet 8 and the data packet 9, but the receiving device adds the information of the data packet 3, the information of the data packet 5 and the information of the data packet 6 to the feedback information, and the ACK _ SN field included in the feedback information includes the sequence number of the data packet 8. As can be seen from the foregoing description, the receiving device adds information of the data packets to the feedback information in order of the data packets that are not received. If in this way the receiving device is full of feedback information after adding the information of packet 6, the receiving device needs to further determine which packet the next unreceived packet is in addition to packet 3, packet 5 and packet 6 to which the feedback information corresponds (or indicates). It can be seen that a further search process is required for the receiving device, which is not beneficial to saving power consumption of the device.

In the embodiment of the present application, the ACK _ SN field in the feedback information may carry information of the sequence number (n + 1). For example, the receiving device does not receive the data packet 3, the data packet 5, the data packet 6, the data packet 8 and the data packet 9, but the receiving device adds the information of the data packet 3, the information of the data packet 5 and the information of the data packet 6 to the feedback information, and the ACK _ SN field included in the feedback information includes the sequence number of the data packet 8. As can be seen from the foregoing description, the receiving device adds information of the data packets to the feedback information in order of the data packets that are not received. Then, after the receiving device adds the information of the data packet 6, if the feedback information is full, the receiving device directly adds the information of the sequence number (n +1) in the ACK _ SN field, and does not need to search which data packet is not received next, which helps to save the power consumption of the receiving device.

As an optional implementation manner, the information of the sequence number (n +1) carried in the first field may also indicate a reception status of the data packet with the sequence number (n +1), where the reception status of the data packet includes successful reception or non-reception. That is, after receiving the feedback information, the transmitting device may determine, according to the information of the sequence number (n +1) carried in the first field, that the reception status of the packet with the sequence number (n +1) is successful in reception or not received, or that the reception status of the packet with the sequence number (n +1) is considered to be a pending status. Alternatively, the information of the sequence number (n +1) carried in the first field may not be used to indicate the reception status of the data packet with the sequence number (n +1), but may be used as a flag information.

The feedback information may include information of a packet to be fed back among packets not received by the receiving apparatus. The data packets to be fed back mean that the information of these data packets waits to be sent to the sending device by the feedback information. The information of the data packet to be fed back may have never been fed back to the sending device before, or may have been fed back to the sending device before, which is repeated this time. For example, the information including the data packet 3 added to the feedback information by the receiving device may never be sent to the sending device, or the feedback information sent before may already include the information of the data packet 3, and then the information of the data packet 3 is added to the feedback information this time, which belongs to repeated feedback, so as to improve the reading success rate of the sending device for the feedback information.

Slicing may also be performed for one packet, and it is understood that one packet may include a plurality of subpackets. Then the receiving device may not receive the entire data packet or may not receive only a part of sub-data packets in one data packet, and may receive successfully for the remaining part of sub-data packets. The information of the data packets included in the feedback information may also be different for these two different cases.

In this embodiment of the present application, the feedback information may include a sequence number of a first data packet to be fed back in data packets that are not received by the receiving device; or, the sequence number of a second data packet to be fed back in the data packets not received by the receiving device is included, and the start position information and the end position information of the sub data packets not received in the second data packet are included; or, the sequence number of a first data packet to be fed back in data packets not received by the receiving device, the sequence number of a second data packet to be fed back in data packets not received by the receiving device, and the start position information and the end position information of sub data packets not received in the second data packet are included.

For example, the receiving apparatus does not receive the first packet as a whole, and if the first packet also includes a plurality of subpackets, the receiving apparatus does not receive all of the subpackets included in the first packet. Therefore, the information of the first data packet added to the feedback information by the receiving device only needs to include the sequence number of the first data packet, and the sequence number of the first data packet can be used for indicating the first data packet.

And for the second data packet, the receiving device receives part of sub data packets included in the second data packet successfully, and for the rest of sub data packets included in the second data packet, the receiving device does not receive the rest of sub data packets. Therefore, the information of the second packet added to the feedback information by the receiving device may include the sequence number of the second packet and the start position information and the end position information of the sub-packet not received in the second packet. The sending device may determine the second data packet according to the sequence number of the second data packet, and may determine which sub data packets in the second data packet are not received according to the start position information and the end position information of the sub data packets that are not received in the second data packet, so that the sending device may only need to retransmit the part of sub data packets. For example, if the sub-packet within the second packet that is not received is sub-packet 1, the receiving device may add the sequence number of the second packet, and the start position information and the end position information of sub-packet 1 to the feedback information.

The data packets are not strictly sized, but are sliced. Or it will be appreciated that the receiving device may determine the sub-packets based on the receipt of the data packets. For example, please refer to fig. 5, which is a diagram illustrating a data packet. The portion labeled "1" in fig. 5 indicates a portion of the packet that was successfully received by the receiving device, and the portion labeled "0" indicates a portion of the packet that was not received by the receiving device. It can be seen that the non-received portion of the receiving device is continuous, and there is no discontinuous area, so that the receiving device can regard the non-received portion as a sub-packet, which is equivalent to that the receiving device has 1 sub-packet not received.

For another example, please refer to fig. 6, which is a diagram illustrating a data packet. The portion labeled "1" in fig. 6 indicates a portion of the packet that was successfully received by the receiving device, and the portion labeled "0" indicates a portion of the packet that was not received by the receiving device. It can be seen that the portions not received by the receiving device are discontinuous, that is, in fig. 6, there are discontinuous portions that are not received. The receiving device may treat the two parts that are not received as one sub-packet, which corresponds to 2 sub-packets that the receiving device does not receive. It can also be seen from fig. 6 that the size of the two unreceived subpackets is different. Of course, the size of the unreceived sub-packets may also be the same, depending on the size of the particular unreceived portion.

Then, for example, only one sub-packet in the second data packet is not received by the receiving device, the information of the second data packet added to the feedback information by the receiving device may include the sequence number of the second data packet and the start position information and the end position information of the sub-packet. For example, for the data packet shown in fig. 5, the information of the data packet added to the feedback information by the receiving device includes the number of the data packet, and the start position information and the end position information of the portion marked as "1".

Or, for example, if the second data packet has a plurality of discontinuous sub-data packets that are not received by the receiving device, the information of the second data packet added to the feedback information by the receiving device may include the sequence number of the second data packet and the start position information and the end position information of each sub-data packet included therein. Or, if the second data packet includes a plurality of non-received discontinuous sub-packets, in the feedback information, each of the plurality of non-received discontinuous sub-packets may be indicated by a sequence number of the second data packet and the start position information and the end position information of each sub-packet. For example, for the data packet shown in fig. 6, the information of the data packet added to the feedback information by the receiving device includes the number of the data packet, and the respective start position information and end position information of two portions marked with "1" therein.

Take the RLC layer of the receiving device to generate the feedback information as an example. Referring to fig. 7, a schematic diagram of a format of feedback information generated for the RLC, or in other words, a schematic diagram of an RLC PDU carrying the feedback information. Fig. 7 exemplifies that the receiving apparatus adds the information of the first packet and the information of the second packet to the feedback information, and the receiving apparatus does not receive the first packet as a whole, and does not receive the second packet, which is a partial sub-packet. In addition, the first packet should be received before the second packet in the normal reception order (of course the actual reception order may not be the case, and is only for the purpose of describing the normal order of the packets).

The uppermost partition of fig. 7, representing a bit (bit) and one cell representing one bit, can be seen as an RLC PDU in octal format, so one row comprises 8 bits. D/C in fig. 7 denotes data (data, D)/control (C), and CPT denotes a control PDU type (control PDU type). The ACK _ SN in fig. 7 (shown as the ACK/nack sequence number field in fig. 7) represents the first field, since the first row in fig. 7 has only 8 bits, so the remaining space of the first row is not enough to carry the ACK _ SN field, and therefore the beginning of the second row in fig. 7 also includes the ACK _ SN, and the ACK _ SN of the first row and the ACK _ SN of the second row in fig. 7 represent the same field. E1 and E2 may be considered intervals. The ACK _ SN may carry information of a sequence number (n +1), and if the feedback information includes only information of the first data packet and information of the second data packet, n may be a sequence number of the second data packet, and if the feedback information includes information of other data packets in addition to the information of the first data packet and the information of the second data packet, n is a sequence number of a latest data packet among the data packets indicated by the feedback information.

The blank region after E1 of the second row of fig. 7 may be a NACK _ SN field (denoted as a negative acknowledgement sequence number field in fig. 7), for example, referred to as a first NACK _ SN field. A blank region until E1 of the third row may be a first NACK _ SN field. Wherein, one NACK _ SN field may be used to carry a sequence number of one data packet. Since the receiving device adds information of the non-received data packets to the feedback information sequentially, the first NACK _ SN field may carry a sequence number of the first data packet. Since the receiving device is not receiving the first packet as a whole, it is only necessary to add the sequence number of the first packet, and it is not necessary to add the location information of the sub-packets of the first packet, so it can be seen in fig. 7 that after the first NACK _ SN field is finished, the intervals E1 and E2 are completed, and then the next NACK _ SN field is started, indicating that the receiving device does not add the location information of the sub-packets of the first packet.

After the first NACK _ SN field ends, the next NACK _ SN field starts, e.g., referred to as a second NACK _ SN field, at intervals E1 and E2. Until E1 of the fifth row, there is a second NACK _ SN field. The second NACK _ SN field may carry a sequence number of the second data packet. Since the receiving device does not receive part of the sub-packets of the second packet, the information of the second packet added to the feedback information by the receiving device needs to include the start position information and the end position information of the sub-packets not received in the second packet, in addition to the sequence number of the second packet. The blank area after E2 in the fifth row, the blank area before the SOend (in fig. 7, the SOend field is referred to as an end position information field) in the sixth row, and the SOend (in fig. 7, the SOend field is referred to as a start position information field) in the seventh row are SOstart fields (in fig. 7, the SOstart fields are referred to as start position information fields), and one SOstart field is used to carry one start position information. Following the SOstart field is a SOend field, one for carrying an end position information.

If only one sub-packet in the second packet is not received (or, the portion of the second packet that is not received is continuous), the receiving apparatus may add the start position information of the sub-packet to the SOstart field formed by the blank area after E2 of the fifth row, the blank area before the SOend of the sixth row, and the seventh row, and add the end position information of the sub-packet to the SOend field formed by the blank area after the SOstart of the seventh row, the eighth row, and the blank area before the NACK _ SN field of the ninth row. In the NACK _ SN field (for example, referred to as the third NACK _ SN field) in the ninth row, the receiving device may continue to sequentially add the sequence numbers of other non-received data packets to be fed back, in the manner described above.

Alternatively, if a plurality of discontinuous sub-packets are not received in the second packet (or, the non-received portion of the second packet is discontinuous), the receiving apparatus may add the start position information of a first sub-packet of the plurality of discontinuous sub-packets to the SOstart field configured by the blank area after E2 of the fifth row, the blank area before the SOend of the sixth row, and the seventh row, and add the end position information of the sub-packet to the SOend field configured by the blank area after the SOstart of the seventh row, the eighth row, and the blank area before the NACK _ SN field of the ninth row. And in the third NACK _ SN field in the ninth row, the receiving device may add the sequence number of the second packet, and after the third NACK _ SN field, there may also be a start field and a start field, which are respectively used to add the start position information and the end position information of the second sub packet in the multiple discontinuous sub packets, and so on, until after the start position information and the end position information of the last sub packet in the multiple discontinuous sub packets are added to the feedback information, the receiving device may continue to sequentially add the sequence numbers of other non-received packets to be fed back.

Fig. 7 illustrates an example in which the feedback information includes information of a packet having only a sequence number, and information of a packet having a sequence number and position information. In practical applications, the feedback information may include only the sequence number of the data packet, and not the location information of the data packet. For example, the receiving device adds to the feedback information the information of packet 1 and the information of packet 2, while the receiving device is not receiving for both packet 1 and packet 2 as a whole, so the feedback information may include only the sequence number of packet 1 and the sequence number of packet 2.

Alternatively, the feedback information may include only the information of the packet having the sequence number and the position information. For example, the receiving device adds the information of the data packet 1 and the information of the data packet 2 to the feedback information, and the receiving device does not receive the

data packets

1 and 2 for part of the sub-data packets, so the information of the data packet 1 included in the feedback information may include the sequence number of the data packet 1 and the start position information and the end position information of the sub-data packets not received in the data packet 1, and similarly, the information of the data packet 2 included in the feedback information may include the sequence number of the data packet 2 and the start position information and the end position information of the sub-data packets not received in the data packet 2.

The information of the data packet included in the feedback information, which content is included in the data packet, is related to the receiving condition of the data packet by the receiving device, and is not limited specifically.

S42, the receiving device sends the feedback information to the sending device, and the sending device receives the feedback information from the receiving device.

After generating the feedback information, the receiving device may send the feedback information to the sending device, so that the sending device obtains the feedback information.

S43, the sending device determines, according to the feedback information, information of a data packet to be fed back in data packets that are not received by the receiving device, and the feedback information further includes a first field, where the first field carries information of a sequence number (n +1), and n is a sequence number of a latest data packet in the data packets indicated by the feedback information.

After the sending device receives the feedback information, the serial number of a first data packet to be fed back in data packets which are not received by the receiving device can be determined; or, determining a sequence number of a second data packet to be fed back in the data packets not received by the receiving device, and start position information and end position information of sub data packets not received in the second data packet; or, determining a sequence number of a first data packet to be fed back in data packets which are not received by the receiving device, and a sequence number of a second data packet to be fed back in the data packets which are not received by the receiving device, and start position information and end position information of sub data packets which are not received in the second data packet.

The transmitting device can determine that the data packets are not received by the receiving device according to the information of the data packets included in the feedback information, so that the transmitting device can determine whether to retransmit the data packets. For example, for a data packet whose feedback information includes only a sequence number, the transmitting device may determine that the receiving device is not receiving the data packet as a whole, and if retransmission is required, the transmitting device may retransmit the data packet as a whole; for the data packet whose feedback information includes the sequence number and the position information, the sending device may determine that the receiving device does not receive the part indicated by the position information in the data packet, and if retransmission is required, the sending device may retransmit only the unreceived sub-data packet without retransmitting the entire data packet, thereby saving transmission resources.

If the receiving device is a terminal device, the feedback information may be generated by a baseband chip of the terminal device, and the feedback information sent in S43 may refer to a signal that is sent out through an antenna of the terminal device and is processed by modulation and coding, or the feedback information may also be a digital signal that is sent to a radio frequency chip by the baseband chip of the terminal device through an interface with the radio frequency chip of the terminal device.

Alternatively, if the receiving device is a base station, the feedback information is generated by the base station, e.g. by some or some processing component of the base station, e.g. by one or more chips in the base station. The feedback information transmitted in S43 may be a signal transmitted through an antenna of the base station and processed by modulation and coding, or the feedback information may be a digital signal transmitted by a component of the base station for generating the feedback information to a radio frequency processing component of the base station through an interface with the radio frequency processing component.

In the embodiment of the present application, the first field included in the feedback information carries information of a sequence number (n +1), and n is a sequence number of the latest data packet in the data packets indicated by the feedback information. In this way, the receiving apparatus does not need to determine which of the next unreceived packets of the receiving apparatus is other than the packet indicated by the feedback information, but only needs to add the sequence number of the next packet of the latest packet of the packets indicated by the feedback information to the feedback information, thereby reducing the workload of the receiving apparatus and contributing to saving the power consumption of the apparatus.

The following describes an apparatus for implementing the above method in the embodiment of the present application with reference to the drawings. Therefore, the above contents can be used in the subsequent embodiments, and the repeated contents are not repeated.

Fig. 8 is a schematic block diagram of a communication device 800 provided in an embodiment of the present application. Illustratively, the communication device 800 is, for example, a receiving device 800. The receiving device 800 may be a terminal device, a network device, or a module for performing functions of the receiving device, such as a system on a chip. The receiving device 800 includes a processing module 810 and a transceiver module 820. Among other things, the processing module 810 may be used to perform all operations performed by a receiving device in the embodiment shown in fig. 4 except transceiving operations, e.g., S41, and/or other processes for supporting the techniques described herein. Transceiver module 820 may be used to perform all transceiving operations performed by a receiving device in the embodiment illustrated in FIG. 4, such as S42 in the embodiment illustrated in FIG. 4, and/or other processes for supporting the techniques described herein.

A processing module 810, configured to generate feedback information, where the feedback information includes information of a data packet to be fed back in a data packet that is not received by the receiving apparatus 800, and the feedback information further includes a first field, where the first field carries information of a sequence number (n +1), and n is a sequence number of a latest data packet in the data packet indicated by the feedback information;

A transceiving module 820, configured to send the feedback information to a sending device.

As an optional implementation manner, the first field is an acknowledgement sequence number field. That is, the first field is an ACK _ SN field.

As an optional implementation manner, the feedback information includes information of a data packet to be fed back in a data packet not received by the receiving apparatus 800, including:

the feedback information includes a sequence number of a first data packet to be fed back in data packets not received by the receiving apparatus 800; or,

the feedback information includes a sequence number of a second data packet to be fed back in data packets not received by the receiving device 800, and start position information and end position information of sub data packets not received in the second data packet; or,

the feedback information includes a sequence number of a first data packet to be fed back in data packets not received by the receiving apparatus 800, and includes a sequence number of a second data packet to be fed back in data packets not received by the receiving apparatus 800, and start position information and end position information of sub-data packets not received in the second data packet.

As an alternative to the above-described embodiment,

the second data packet comprises a plurality of non-received discontinuous sub-packets, and each sub-packet in the plurality of non-received discontinuous sub-packets is indicated by a sequence number of the second data packet and start position information and end position information of each sub-packet.

As an optional implementation manner, the unreceived sub-packet is a plurality of discontinuous sub-packets, the start position information includes start position information of each sub-packet in the unreceived sub-packet, and the end position information includes end position information of each sub-packet in the unreceived sub-packet.

As an optional implementation manner, the information of the sequence number (n +1) is used to indicate a receiving status of a data packet with the sequence number (n +1), where the receiving status of the data packet includes successful receiving or non-receiving.

It should be understood that the processing module 810 in the embodiments of the present application may be implemented by a processor or a processor-related circuit component, and the transceiver module 820 may be implemented by a transceiver or a transceiver-related circuit component.

As shown in fig. 9, an embodiment of the present application further provides a communication device 900. Illustratively, the communication device 900 is, for example, a receiving device 900. The receiving device 900 may be a terminal device, a network device, or a module for performing functions of the receiving device, such as a system on a chip. The receiving device 900 comprises a processor 910, a memory 920 and a transceiver 930, wherein the memory 920 stores instructions or programs and the processor 910 is configured to execute the instructions or programs stored in the memory 920. When the instructions or programs stored in the memory 920 are executed, the processor 910 is configured to perform the operations performed by the processing module 810 in the above embodiments, and the transceiver 930 is configured to perform the operations performed by the transceiver module 820 in the above embodiments.

It should be understood that the receiving device 800 or the receiving device 900 according to the embodiment of the present application may correspond to the receiving device in the embodiment shown in fig. 4, and operations and/or functions of the respective modules in the receiving device 800 or the receiving device 900 are respectively for implementing the corresponding flows in the embodiment shown in fig. 4, and are not described herein again for brevity.

Fig. 10 is a schematic block diagram of a communication device 1000 according to an embodiment of the present application. Illustratively, the communication device 1000 is, for example, a transmitting device 1000. The transmitting device 1000 may be a terminal device, a network device, or a module for performing functions of the transmitting device, such as a system on a chip. The transmitting device 1000 includes a processing module 1010 and a transceiver module 1020. Among other things, the processing module 1010 may be used to perform all operations performed by a transmitting device in the embodiment shown in fig. 4 except transceiving operations, e.g., S43, and/or other processes for supporting the techniques described herein. Transceiver module 1020 may be used to perform all transceiving operations performed by a transmitting device in the embodiment illustrated in FIG. 4, such as S42 in the embodiment illustrated in FIG. 4, and/or other processes for supporting the techniques described herein.

A transceiver module 1020 for receiving feedback information from a receiving device;

the processing module 1010 is configured to determine, according to the feedback information, information of a data packet to be fed back in a data packet that is not received by the receiving device, where the feedback information further includes a first field, the first field carries information of a sequence number (n +1), and n is a sequence number of a latest data packet in the data packets indicated by the feedback information.

As an optional implementation manner, the processing module 1010 is configured to determine, according to the feedback information, information of a data packet to be fed back in a data packet that is not received by the receiving device, by:

As an optional implementation manner, the second data packet includes a plurality of non-received discontinuous sub-packets, and each sub-packet in the plurality of non-received discontinuous sub-packets is indicated by a sequence number of the second data packet and start position information and end position information of each sub-packet.

It should be understood that the processing module 1010 in the embodiments of the present application may be implemented by a processor or a processor-related circuit component, and the transceiver module 1020 may be implemented by a transceiver or a transceiver-related circuit component.

As shown in fig. 11, an embodiment of the present application further provides a communication device 1100. Illustratively, the communication device 1100 is, for example, a transmitting device 1100. The transmitting device 1100 may be a terminal device, a network device, or a module for performing functions of the transmitting device, and the transmitting device 1100 includes a processor 1110, a memory 1120 and a transceiver 1130, where the memory 1120 stores instructions or programs, and the processor 1110 is configured to execute the instructions or programs stored in the memory 1120. When the instructions or programs stored in the memory 1120 are executed, the processor 1110 is configured to perform the operations performed by the processing module 1010 in the above embodiments, and the transceiver 1030 is configured to perform the operations performed by the transceiver module 1020 in the above embodiments.

It should be understood that the sending device 1000 or the sending device 1100 according to the embodiment of the present application may correspond to the sending device in the embodiment shown in fig. 4, and operations and/or functions of respective modules in the sending device 1000 or the sending device 1100 are respectively for implementing corresponding flows in the embodiment shown in fig. 4, and are not described herein again for brevity.

The embodiment of the application also provides a communication device, and the communication device can be terminal equipment or a circuit. The communication apparatus may be used to perform the actions performed by the transmitting device or the receiving device of the method embodiment shown in fig. 4 described above. It is to be understood that when the sending device in the embodiment shown in fig. 4 is a terminal device or a circuit, one way is realized by the communication apparatus. When the receiving device in the embodiment shown in fig. 4 is a terminal device or a circuit, one way is to implement this method by using the communication apparatus.

When the communication apparatus is a terminal device, fig. 12 shows a schematic structural diagram of a simplified terminal device. For easy understanding and convenience of illustration, in fig. 12, the terminal device is exemplified by a mobile phone. As shown in fig. 12, the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and an input-output device. The processor is mainly used for processing communication protocols and communication data, controlling the terminal equipment, executing software programs, processing data of the software programs and the like. The memory is used primarily for storing software programs and data. The radio frequency circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user. It should be noted that some kinds of terminal devices may not have input/output devices.

When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs baseband signals to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signals and sends the radio frequency signals to the outside in the form of electromagnetic waves through the antenna. For example, the feedback information described in this embodiment may refer to a baseband signal output by the processor to the radio frequency circuit, or may also refer to a signal sent out by the radio frequency circuit through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data. For ease of illustration, only one memory and processor are shown in FIG. 12. In an actual end device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be provided independently of the processor, or may be integrated with the processor, which is not limited in this embodiment.

In the embodiment of the present application, the antenna and the radio frequency circuit having the transceiving function may be regarded as a transceiving unit of the terminal device, and the processor having the processing function may be regarded as a processing unit of the terminal device. As shown in fig. 12, the terminal device includes a transceiving unit 1210 and a processing unit 1220. A transceiver unit may also be referred to as a transceiver, a transceiving device, etc. A processing unit may also be referred to as a processor, a processing board, a processing module, a processing device, or the like. Optionally, a device in the transceiver unit 1210 for implementing a receiving function may be regarded as a receiving unit, and a device in the transceiver unit 1210 for implementing a transmitting function may be regarded as a transmitting unit, that is, the transceiver unit 1210 includes a receiving unit and a transmitting unit. A transceiver unit may also sometimes be referred to as a transceiver, transceiving circuitry, or the like. A receiving unit may also be referred to as a receiver, a receiving circuit, or the like. A transmitting unit may also sometimes be referred to as a transmitter, or a transmitting circuit, etc.

It should be understood that the transceiving unit 1210 is configured to perform the transmitting operation and the receiving operation on the receiving device side in the method embodiment shown in fig. 4, and the processing unit 1220 is configured to perform other operations besides the transceiving operation on the receiving device side in the method embodiment shown in fig. 4.

For example, in one implementation, the transceiving unit 1210 is configured to perform transceiving steps on the receiving device side in the embodiment shown in fig. 4, e.g., S42, and/or other processes for supporting the techniques described herein. Processing unit 1220 is used to perform operations on the receiving device side in the embodiment shown in fig. 4 other than transceiving operations, such as S41, and/or other processes for supporting the techniques described herein.

Alternatively, the transceiver 1210 is configured to perform the transmitting operation and the receiving operation on the transmitting device side in the method embodiment shown in fig. 4, and the processing unit 1220 is configured to perform other operations besides the transmitting and receiving operation on the transmitting device side in the method embodiment shown in fig. 4.

For example, in one implementation, the transceiving unit 1210 is configured to perform transceiving steps on the side of the transmitting device in the embodiment shown in fig. 4, e.g., S42, and/or other processes for supporting the techniques described herein. Processing unit 1220 is configured to perform operations on the transmitting device side in the embodiment shown in fig. 4, such as S43, in addition to transceiving operations, and/or other processes for supporting the techniques described herein.

When the communication device is a chip, the chip includes a transceiver unit and a processing unit. The transceiver unit can be an input/output circuit and a communication interface; the processing unit is a processor or a microprocessor or an integrated circuit integrated on the chip.

When the communication apparatus in the embodiment of the present application is a terminal device, reference may be made to the device shown in fig. 13. As an example, the device may perform functions similar to processor 1310 in FIG. 13. In fig. 13, the apparatus includes a processor 1310, a transmit data processor 1320, and a receive data processor 1330. The processing module 810 in the above embodiments may be the processor 1310 in fig. 13, and performs the corresponding functions; the transceiver module 820 in the above embodiments may be the transmission data processor 1320 and/or the reception data processor 1330 in fig. 13. Alternatively, the processing module 1010 in the above embodiments may be the processor 1310 in fig. 13, and perform the corresponding functions; the transceiver module 1020 in the above embodiments may be the transmit data processor 1320 and/or the receive data processor 1330 in fig. 13.

Although fig. 13 shows a channel encoder and a channel decoder, it is understood that these blocks are not limitative and only illustrative to the present embodiment.

Fig. 14 shows another form of the present embodiment. The processing device 1400 includes modules such as a modulation subsystem, a central processing subsystem, and peripheral subsystems. The communication device in this embodiment may serve as a modulation subsystem therein. In particular, the modulation subsystem may include a processor 1403, an interface 1404. The processor 1403 completes the functions of the processing module 810, and the interface 1404 completes the functions of the transceiver module 820. Alternatively, the processor 1403 completes the functions of the processing module 1010, and the interface 1404 completes the functions of the transceiver module 1020. As another variation, the modulation subsystem includes a memory 1406, a processor 1403, and a program stored on the memory 1406 and operable on the processor, and the processor 1403 when executing the program implements the method of the transmitting device side or the receiving device side in the method embodiment shown in fig. 4. It should be noted that the memory 1406 may be non-volatile or volatile, and may be located within the modulation subsystem or within the processing device 1400, as long as the memory 1406 is connected to the processor 1403.

Embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, may implement the process related to the receiving device in the embodiment shown in fig. 4 provided in the foregoing method embodiments.

Embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, may implement the process related to the sending device in the embodiment shown in fig. 4 provided in the foregoing method embodiments.

Embodiments of the present application further provide a computer program product containing instructions, where the instructions, when executed, perform the method on the receiving device side in the method embodiment shown in fig. 4.

Embodiments of the present application further provide a computer program product containing instructions, where the instructions, when executed, perform the method on the transmitting device side in the method embodiment shown in fig. 4.

It should be understood that the processor mentioned in the embodiments of the present application may be a Central Processing Unit (CPU), and may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It will also be appreciated that the memory referred to in the embodiments of the application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

It should be noted that when the processor is a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, the memory (memory module) is integrated in the processor.

It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific implementation of the present application, but the scope of the embodiments of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the embodiments of the present application, and all the changes or substitutions should be covered by the scope of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for transmitting feedback information, comprising:

the method comprises the steps that a receiving device generates feedback information, wherein the feedback information comprises information of a data packet to be fed back in the data packets which are not received by the receiving device, the feedback information also comprises a first field, the first field carries information of a sequence number (n +1), and n is the sequence number of the latest data packet in the data packets indicated by the feedback information;

and the receiving equipment sends the feedback information to the sending equipment.

2. The method of claim 1, wherein the first field is an acknowledgement sequence number field.

3. The method according to claim 1 or 2, wherein the feedback information includes information of a data packet to be fed back in a data packet not received by the receiving device, and includes:

4. The method of claim 3,

5. The method of claim 3,

the unreceived sub-packets are a plurality of discontinuous sub-packets, the start position information includes start position information of each sub-packet in the unreceived sub-packets, and the end position information includes end position information of each sub-packet in the unreceived sub-packets.

6. The method according to any one of claims 1 to 5, wherein the information of the sequence number (n +1) is used to indicate a reception status of a data packet with the sequence number (n +1), wherein the reception status of the data packet includes successful reception or non-reception.

7. A method of receiving feedback information, comprising:

the sending equipment receives feedback information from the receiving equipment;

the sending device determines information of a data packet to be fed back in data packets which are not received by the receiving device according to the feedback information, and the feedback information further includes a first field, the first field carries information of a sequence number (n +1), and n is a sequence number of the latest data packet in the data packets indicated by the feedback information.

8. The method of claim 7, wherein the first field is an acknowledgement sequence number field.

9. The method according to claim 7 or 8, wherein the determining, by the sending device, information of a data packet to be fed back in the data packets not received by the receiving device according to the feedback information comprises:

10. The method of claim 9,

11. The method of claim 9,

12. The method according to any one of claims 7 to 11, wherein the information of the sequence number (n +1) is used to indicate a reception status of a data packet with the sequence number (n +1), wherein the reception status of the data packet includes successful reception or non-reception.

13. A communication device, comprising:

a processor, configured to generate feedback information, where the feedback information includes information of a data packet to be fed back in a data packet that is not received by the communication device, and the feedback information further includes a first field, where the first field carries information of a sequence number (n +1), and n is a sequence number of a latest data packet in the data packets indicated by the feedback information;

a transceiver for transmitting the feedback information to a transmitting device.

14. The communications device of claim 13, wherein the first field is an acknowledgement sequence number field.

15. The communication apparatus according to claim 13 or 14, wherein the feedback information includes information of a data packet to be fed back among data packets not received by the communication apparatus, and includes:

the feedback information comprises a sequence number of a first data packet to be fed back in data packets which are not received by the communication equipment; or,

the feedback information comprises a serial number of a second data packet to be fed back in data packets which are not received by the communication equipment, and start position information and end position information of sub data packets which are not received in the second data packet; or,

The feedback information comprises a sequence number of a first data packet to be fed back in data packets which are not received by the communication equipment, and comprises a sequence number of a second data packet to be fed back in the data packets which are not received by the communication equipment, and start position information and end position information of sub data packets which are not received in the second data packet.

16. The communication device of claim 15,

17. The communication device of claim 15,

18. The communication device according to any one of claims 13 to 17, wherein the information of the sequence number (n +1) is used to indicate a reception status of a data packet with the sequence number (n +1), wherein the reception status of the data packet comprises successful reception or non-reception.

19. A communication device, comprising:

a transceiver for receiving feedback information from a receiving device;

and the feedback information further comprises a first field, the first field carries information of a sequence number (n +1), and n is the sequence number of the latest data packet in the data packets indicated by the feedback information.

20. The communications device of claim 19, wherein the first field is an acknowledgement sequence number field.

21. The communication device according to claim 19 or 20, wherein the processor is configured to determine information of a data packet to be fed back in the data packets not received by the receiving device according to the feedback information by:

22. The communication device of claim 21,

23. The communication device of claim 21,

24. The communication device according to any one of claims 10 to 23, wherein the information of the sequence number (n +1) is used to indicate a reception status of a data packet with the sequence number (n +1), wherein the reception status of the data packet comprises successful reception or non-reception.

25. A communication system comprising a communication device according to any of claims 1 to 6 and a communication apparatus according to any of claims 7 to 12.

26. A computer-readable storage medium, characterized in that it stores a computer program which, when run on a computer, causes the computer to perform the method of any of claims 1-6, or causes the computer to perform the method of any of claims 7-12.

27. A chip system, comprising:

a memory: for storing instructions;

a processor configured to call and execute the instructions from the memory, so that a communication device installed with the chip system executes the method according to any one of claims 1 to 6, or so that the communication device executes the method according to any one of claims 7 to 12.

28. A computer program product, characterized in that it comprises a computer program which, when run on a computer, causes the computer to carry out the method according to any one of claims 1 to 6, or causes the computer to carry out the method according to any one of claims 7 to 12.