CN108512633B

CN108512633B - Data transmission method and device

Info

Publication number: CN108512633B
Application number: CN201710114728.0A
Authority: CN
Inventors: 王雪松; 武雨春
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-02-28
Filing date: 2017-02-28
Publication date: 2021-02-12
Anticipated expiration: 2037-02-28
Also published as: CN108512633A; WO2018157745A1

Abstract

The application provides a data transmission method and a data transmission device, which are used for solving the problem that the channel utilization rate of a communication system adopting two transmission modes of GBT and GFT in the prior art is low. In the method, when the access network device does not detect the data sent by the terminal device based on the GFT mode, the access network device can instruct the terminal device to retransmit the data through the second channel resource; after the terminal equipment acquires the retransmission instruction, determining the second channel resource used in the retransmission according to the first channel resource used at this time, and retransmitting the second channel resource; and the access network equipment obtains the data sent by the terminal equipment according to the signal received on the second channel resource. The method can transmit the inspection data packet without adding extra channel resources on the premise of ensuring the data transmission efficiency of the terminal equipment, and the utilization rate of the channel resources is improved.

Description

Data transmission method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a data transmission method and apparatus.

Background

Currently, a terminal device may transmit uplink data to an access network device in two manners, namely, Grant-Base Transmission (GBT) and Grant-Free Transmission (GFT).

Specifically, in a process of sending uplink data, a terminal device (also referred to as a GB _ terminal device) using a GBT scheme includes the following steps:

the GB _ terminal equipment sends a scheduling request (Schedule Req terminal equipment st, SR) to the access network equipment;

after the access network device successfully detects the SR, scheduling channel resources for the GB _ terminal device, and feeding back a scheduling Grant (Schedule Grant) containing a scheduling result to the GB _ terminal device;

the GB _ terminal equipment sends the uplink data to be sent to the access network equipment on the channel resources allocated by the access network equipment;

the access network device may detect in receiving data on the channel resource allocated to the GB _ terminal device, to obtain the uplink data.

In a process of sending uplink data, a terminal device (also called GF _ terminal device) adopting a GFT mode includes the following steps:

the GF _ terminal equipment directly sends the uplink data on the self-selected channel resource without waiting for the access network equipment to allocate the channel resource;

the access network device firstly needs to judge that the GF _ terminal device exists through activity detection, and determines the channel resource used by the GF _ terminal device, so as to detect the uplink data in the data received on the determined channel resource.

According to the above description of the two transmission methods, it can be found that, when the terminal device adopts the GFT method, the overhead caused by transmitting various scheduling signaling (such as SR, scheduling grant, etc.) is greatly reduced, and the transmission delay of uplink data is greatly reduced because the access network device is not required to perform uplink scheduling. Therefore, in some scenarios, for example, scenarios where the terminal device sends data with burstiness and Low rate and has a severe requirement on the transmission delay of uplink data, such as a large-scale Machine Type Communication (mtc) scenario and a Low-Latency high-reliability Communication (URLLC) scenario, the terminal device may transmit uplink data in a GFT manner.

In addition, compared with the transmission in the GFT mode, the terminal device can guarantee the uplink data transmission rate of the terminal device under the condition of the GBT mode.

In consideration of the respective advantages of the two transmission modes, the communication system can simultaneously adopt the two transmission modes to realize uplink data transmission. Thus, both GB _ terminal devices and GF _ terminal devices may be present within the coverage area of a certain access network device in the communication system.

In order to ensure the utilization rate of the channel resources, the terminal devices adopting the two transmission modes share the channel resources. However, when the access network device performs channel resource scheduling on GB _ terminal device, it cannot know the channel resource that will be used by the GF _ terminal device, and the GF _ terminal device cannot know whether the channel resource that will be used is scheduled to the GB _ terminal device by the access network device, so in the above communication system, there is a high possibility that the GB _ terminal device and the GF _ terminal device use the same channel resource for the above data transmission. This may cause mutual interference between the GB _ terminal device and the GF _ terminal device, that is, signal collision occurs, and this signal collision may cause the access network device to detect uplink data of the GB _ terminal device and the GF _ terminal device in a signal that is difficult to be received on the channel resource, which may deteriorate data transmission performance of the communication system.

Currently, the communication system may employ an Outer Code (Outer Code) technique to solve the problem of data transmission performance deterioration due to the above-mentioned signal collision. The specific scheme comprises the following steps:

after the GB _ terminal equipment determines that the communication system predicts the number M of channel resources to be used by the GF _ terminal equipment, M check data packets are added on the basis of K data packets split from first uplink data to be sent to obtain M + K data packets; transmitting the M + K data packets to the access network equipment through the distributed M + K channel resources;

meanwhile, the GF _ terminal equipment automatically transmits second uplink data to be transmitted to the access network equipment through M blocks of channel resources;

after the access network device determines that the signal collision occurs on the M channel resources, the first uplink data sent by the GB _ terminal device and the second uplink data sent by the GF _ terminal device may be accurately detected in the signal received on the M + K channel resources through the M check data packets.

However, as can be seen from the description of the above outer code scheme, when the communication system adopts the outer code technology, M check data packets need to be added to combat signal collision on M channel resources, and then when the GB _ terminal device transmits K data packets and the GF _ terminal device transmits M data packets, even if all of the M channel resources selected by the GF _ terminal device collide with the channel resources used by the GB _ terminal device, K + M channel resources are finally occupied. Obviously, the outer code scheme still transmits K + M data packets of uplink data through K + M channel resources, which is substantially equal to allocating channel resources between the GBT mode and the GFT mode, respectively, and thus does not improve the utilization rate of the channel resources.

Disclosure of Invention

The application provides a data transmission method and a data transmission device, which are used for solving the problem that the channel utilization rate of a communication system adopting two transmission modes of GBT and GFT in the prior art is low.

The specific technical scheme provided by the application is as follows:

in a first aspect, an embodiment of the present application provides a data transmission method, where the method includes: after an access network device determines that a first terminal device sends first data on a first channel resource based on a GFT mode and a second terminal device sends second data on the first channel resource based on a GBT mode, jointly detecting the first data and the second data on the first channel resource; when the access network device does not detect the first data, indicating the first terminal device to retransmit the first data, and determining the second channel resource according to the first channel resource; and then the access network equipment receives the retransmission signal of the first terminal equipment on a second channel resource, and obtains the first data according to the retransmission signal.

By the method, when the access network equipment does not detect the data transmitted by the terminal equipment based on the GFT mode successfully, the access network equipment instructs the terminal equipment to retransmit the transmitted data, and determines a second channel resource used by the terminal equipment in the retransmission according to a first channel resource used by the terminal equipment in the current transmission; since the access network device has already determined the second channel resource, the data sent by the terminal device may be obtained according to the retransmission signal received on the second channel resource. By adopting the method, on the premise of ensuring the data transmission efficiency of the terminal equipment adopting the GFT mode, additional channel resources are not required to be added for transmitting the inspection data packet and the like, and the utilization rate of the channel resources is improved.

In one possible design, the access network device instructs the first terminal device to retransmit the first data by:

the first mode is as follows: the access network equipment sends a failure response message to the first terminal equipment; the failure response message is used for notifying the first terminal device that the access network device does not detect the first data, and instructing the first terminal device to retransmit the first data;

the second mode is as follows: the access network equipment does not send a successful response message aiming at the first data to the first terminal equipment so as to instruct the first terminal equipment to retransmit the first data; wherein the successful response message is used to notify the first terminal device that the access network device has detected the first data.

Through the two modes, the access network equipment indicates the first terminal equipment to retransmit the first data when detecting the first data, so that the data transmission efficiency of the terminal equipment adopting the GFT mode is ensured.

In one possible design, the failure acknowledgement message may be a false acknowledgement command NACK and the success acknowledgement message may be a correct acknowledgement command ACK.

In one possible design, the access network device determines the second channel resource according to a preset first mapping relationship and the first channel resource; the first mapping relationship is used for representing a one-to-one correspondence relationship between the channel resources used by the first terminal device in the current transmission and the channel resources used in the next retransmission.

Through the above steps, the access network device may determine a second channel resource used by the first terminal device for retransmitting the first data, that is, may determine that information about retransmission of the first data by the first terminal device is carried in a retransmission signal subsequently received on the second channel resource, so that the access network device may obtain the first data according to the retransmission signal.

In one possible design, the first mapping relationship is agreed between the access network device and the first terminal device. In this way, it may be ensured that the second channel resources determined by the access network device and the second channel resources determined by the first terminal device when retransmitting the first data are completely consistent.

In one possible design, after the access network device determines that the first data is not detected, before the access network device obtains the first data according to a retransmission signal received on the second channel resource, the method further includes: the access network equipment determines whether the second channel resource is scheduled to other terminal equipment, and after determining that the second channel resource is scheduled to a third terminal equipment needing to send third data based on a GBT mode, the access network equipment sends a transmission instruction to the third terminal equipment, wherein the transmission instruction is used for indicating the third terminal equipment to reduce sending power and/or transmission code rate when sending the third data to the access network equipment through the second channel resource.

By the method, the access network equipment indicates the third terminal equipment using the same channel resource to reduce the sending power and/or the transmission code rate when the access network equipment retransmits the data to the first terminal equipment, so that the probability of errors occurring in the data transmission of the first terminal equipment can be reduced, and the success rate of the access network equipment for detecting the data of the first terminal equipment is improved.

In a second aspect, an embodiment of the present application further provides a data transmission method, where the method includes: after a first terminal device and a second terminal device respectively send first data and second data on a first channel resource based on a GFT mode, an access network device determines that joint detection of the first data and the second data on the first channel resource fails, instructs a target terminal device in the first terminal device and the second terminal device to retransmit data sent by the target terminal device, and determines a second channel resource used when the target terminal device retransmits according to the first channel resource; and then the access network equipment receives the retransmission signal of the target terminal equipment on the second channel resource, and obtains the data sent by the target terminal equipment according to the retransmission signal.

In one possible design, the instructing, by the access network device, the target terminal device to retransmit the data sent by the target terminal device includes:

the access network equipment does not send a successful response message to the target terminal equipment to indicate the target terminal equipment to retransmit the data sent by the target terminal equipment; wherein, the successful response message is used to notify the target terminal device that the access network device has detected the data sent by the target terminal device.

In a scenario of pilot frequency collision, the access network device cannot determine which terminal devices have unsuccessfully transmitted data, that is, the access network device cannot determine to which terminal devices send failure response messages. Therefore, in the embodiment of the present application, the target terminal device is instructed to retransmit the data sent by the target terminal device by not sending a successful response message to the target terminal device, so that the data transmission efficiency of the terminal device adopting the GFT mode is ensured.

In one possible design, the access network device determines a first pilot used by the target terminal device when sending data through the first channel resource, and determines the second channel resource according to a preset second mapping relationship, the first channel resource and the first pilot; the second mapping relation is used for representing the corresponding relation between the channel resource and the pilot frequency information used by the target terminal equipment in the current transmission and the channel resource used in the next retransmission; and in any two second mapping relations, when at least one of the two information used in the transmission is different, the channel resources used in the next retransmission are also different.

In order to avoid the signal collision of the terminal equipment which generates the signal collision in the data transmission during retransmission by using the same second channel resource; the method also aims to prevent a plurality of terminal devices which transmit data to the access network device based on the GFT mode from using the same second channel resource when retransmitting under the condition that no pilot collision or no signal collision occurs currently. Therefore, in the above method, when determining the second channel resource used by the target terminal device in retransmission, a judgment factor, i.e. pilot, may be added.

By the method, the access network device may determine the second channel resource used by the target terminal device for retransmission, that is, may determine that information of retransmission of the data sent by the target terminal device is carried in a retransmission signal subsequently received on the determined second channel resource, so that the access network device may obtain the data sent by the target terminal device according to the retransmission signal.

In a possible design, the second mapping relationship is agreed between the access network device and the target terminal device, so that it can be ensured that the second channel resources used by the target terminal device determined by the access network device during retransmission are completely consistent with the second channel resources determined by the target terminal device during retransmission of the transmitted data.

In one possible design, after the access network device determines that the joint detection of the first data and the second data on the first channel resource fails, before the access network device obtains the data sent by the target terminal device according to the retransmission signal received on the second channel resource, the method further includes: the access network equipment determines whether the second channel resource is scheduled to other terminal equipment, and after determining that the second channel resource is scheduled to a third terminal equipment needing to send third data based on a GBT mode, the access network equipment sends a transmission instruction to the third terminal equipment, wherein the transmission instruction is used for indicating the third terminal equipment to reduce sending power and/or transmission code rate when sending the third data to the access network equipment through the second channel resource.

By the method, the access network equipment indicates the third terminal equipment using the same channel resource to reduce the sending power and/or the transmission code rate when the access network equipment retransmits the target terminal equipment, so that the probability of errors occurring in data transmission of the target terminal equipment can be reduced, and the success rate of the access network equipment for detecting the data of the target terminal equipment is improved.

In one possible design, the obtaining, by the access network device, data sent by the target terminal device according to the retransmission signal received on the second channel resource includes:

and the access network equipment detects the retransmission signal to obtain the data sent by the target terminal equipment.

By the method, the access network device does not consider the signals received on the first channel resource before in the process of detecting the retransmission signals received on the second channel resource, and the success rate of detecting the data sent by the target terminal device is improved.

In a third aspect, a data transmission method in an embodiment of the present application includes:

the first terminal equipment sends first data to the access network equipment through a first channel resource based on a GFT (license-free transmission) mode; after acquiring an instruction of the access network device for retransmitting the first data, determining a second channel resource used by the first terminal device for retransmission according to the first channel resource; and retransmitting the first data to the access network equipment through the second channel resource.

By the method, after the retransmission indication of the access network equipment is obtained, the second channel resource used in the retransmission is determined according to the first channel resource used in the last transmission, and the retransmission is carried out through the second channel resource; since the access network device has already determined the second channel resource, the data sent by the terminal device may be obtained according to the signal received on the second channel resource. By the method, the communication system can transmit the inspection data packet without adding extra channel resources on the premise of ensuring the data transmission efficiency of the terminal equipment adopting the GFT mode, and the like, so that the utilization rate of the channel resources is improved.

In one possible design, the first terminal device obtains the indication of the access network device for retransmitting the first data by:

the first mode is as follows: the first terminal equipment receives a failure response message sent by the access network equipment; the failure response message is used for notifying the first terminal device that the access network device does not detect the first data, and instructing the first terminal device to retransmit the first data;

the second mode is as follows: the first terminal device determines that a successful response message for the first data sent by the access network device is not received, wherein the successful response message is used for notifying the first terminal device that the access network device has detected the first data.

Through the two manners, the first terminal device may obtain an indication of the access network device for retransmitting the first data.

In one possible design, the first terminal device determines the second channel resource according to the first channel resource by: the first terminal equipment determines the second channel resource according to a preset first mapping relation and the first channel resource; the first mapping relationship is used for representing a one-to-one correspondence relationship between the channel resources used by the first terminal device in the current transmission and the channel resources used in the next retransmission.

Through the steps, the first terminal device can determine the second channel resource according to a preset rule, and avoid randomly selecting the channel resource again during retransmission to continue to cause signal collision.

In one possible design, the first terminal device determines the second channel resource according to the first channel resource by:

the first terminal device determines a first pilot frequency used when the first data is sent to an access network device through the first channel resource; determining the second channel resource according to a preset second mapping relation, the first channel resource and the first pilot frequency; the second mapping relationship is used for representing the corresponding relationship between the channel resource and the pilot frequency information used by the first terminal device in the current transmission and the channel resource used in the next retransmission; and in any two second mapping relations, when at least one of the two information used in the transmission is different, the channel resources used in the next retransmission are also different.

By the method, the terminal equipment with signal collision in the data transmission can be prevented from using the same second channel resource during retransmission to cause signal collision; the method can also avoid that a plurality of terminal devices which send data to the access network device based on the GFT mode use the same second channel resource when retransmitting under the condition that no pilot collision or no signal collision happens currently.

In one possible design, based on the above design, the retransmitting, by the first terminal device, the first data to the access network device through the second channel resource includes:

the first terminal equipment randomly selects a second pilot frequency in a preset pilot frequency set, wherein the second pilot frequency is a pilot frequency used by the first terminal equipment when the first terminal equipment retransmits the first data to the access network equipment through the second channel resource; and sending the first data to the access network equipment through the second channel resource by using the second pilot frequency.

By the method, the pilot frequency used by the first terminal device in the retransmission of the transmitted first data is randomly selected from a preset pilot frequency set. In this way, it is also possible to reduce the probability that a plurality of target terminal apparatuses use the same pilot, thereby reducing the probability that a pilot collision occurs when the target terminal apparatuses retransmit transmitted data.

In one possible design, the second mapping relationship is agreed between the access network device and the first terminal device. In this way, it may be ensured that the second channel resources determined by the access network device and the second channel resources determined by the first terminal device when retransmitting the first data are completely consistent.

In a possible design, the retransmitting, by the first terminal device, the first data to the access network device through the second channel resource includes the following modes:

the first mode is as follows: the first terminal equipment retransmits the first data to the access network equipment through the second channel resource;

the second mode is as follows: and the first terminal equipment sends the verification data.

Through the first manner, when the first terminal device retransmits, the retransmitted data is the same as the initial data for the access network device, so that the access network device does not consider the signal received on the first channel resource any more in the process of detecting the retransmitted signal received on the second channel resource, and the success rate of detecting the data sent by the first terminal device is improved.

In the second manner, the access network device may perform inspection processing on the signal received on the first channel resource according to the retransmission signal, so as to obtain the first data.

In a fourth aspect, an embodiment of the present application further provides a data transmission method, where the method includes:

after the access network device determines that the second channel resource used when the first terminal device retransmits is scheduled to the third terminal device, the access network device sends the transmission indication to the third terminal device, so that when the third terminal device sends the third data through the second channel resource, the sending power and/or the transmission code rate can be reduced, the probability of data transmission errors of the first terminal device can be reduced, and the success rate of the access network device detecting the data sent by the first terminal device can be improved.

In a fifth aspect, an embodiment of the present application further provides a data transmission method, where the method includes:

and after receiving a transmission instruction sent by the access network equipment, the third terminal equipment reduces the sending power and/or transmission code rate when the third terminal equipment sends third data to the access network equipment through the second channel resource according to the transmission instruction.

By the method, the third terminal device can reduce the transmission power and/or transmission code rate of the third terminal device when sending the third data to the access network device through the second channel resource, so that the probability of errors occurring in the data transmitted by the first terminal device and retransmitted by using the second channel resource can be reduced, and the success rate of the access network device for detecting the data sent by the first terminal device can be improved.

In one possible design, the third terminal device may decrease the transmission rate of the third terminal device when transmitting the third data through the second channel resource according to the transmission indication by: the third terminal equipment acquires partial data in the third data according to the transmission instruction; and sending the partial data to the access network equipment through the second channel resource.

By the above method, the third terminal device may reduce the data amount of the third data to be sent, so as to reduce the transmission code rate of the third terminal device when sending the third data through the second channel resource.

In one possible design, the third terminal device obtains the partial data in the third data by: the third terminal device may select the partial data in the third data by using a preset algorithm. The partial data may be a continuous data segment in the third data, or may be composed of a plurality of discontinuous data.

In one possible design, the transmission indication includes a reduction in a transmission code rate multiple D, where D is a number greater than 1. The third terminal device obtains partial data in the third data according to the transmission indication by the following method: and the third terminal equipment selects the partial data with the length of 1/D of the third data from the third data according to the transmission indication.

In this way, the third terminal device may reduce, by D times, a transmission code rate for transmitting the third data according to the transmission instruction, thereby meeting the requirement of the access network device.

In one possible design, the third terminal device sends the partial data, and the method includes:

the first method comprises the following steps: the third terminal device may send the portion of data directly to the access network device.

The second method comprises the following steps: the third terminal device supplements invalid data, such as 0 or 1 or other fixed numerical value, to the partial data until the length of the partial data reaches the length of the third data, and then sends the supplemented data to the access network device.

The third method comprises the following steps: the third terminal equipment continues to supplement the partial data on the basis of the partial data until the obtained fourth data with the length equal to that of the third data; then, the third terminal device sends the fourth data to the access network device through the second channel resource.

By the method, the third terminal device can reduce the transmission code rate for sending the third data. In addition, because the access network device may generate a data decoding error on some data bits when detecting the fourth data, by the third method, the access network device may check the data with the decoding error through the repeated partial data supplemented in the fourth data, so as to improve the accuracy of the partial data decoded by the access network device and improve the transmission reliability of the partial data.

In a sixth aspect, an embodiment of the present application provides an access network device, where the access network device has a function of an access network device behavior in the first aspect, where the function may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.

In a possible design, the structure of the access network device includes a receiving unit, a processing unit, and a sending unit, which may perform corresponding functions in the method example of the first aspect, for which specific reference is made to detailed description in the method example, and details are not repeated here.

In one possible design, the access network device includes a transceiver, a processor, and a memory, where the transceiver is used for performing communication interaction with a terminal device, and the processor is configured to support the access network device to perform the corresponding functions in the above-described method example of the first aspect. The memory is coupled to the processor and retains program instructions and data necessary for the access network equipment.

In a seventh aspect, an embodiment of the present application provides an access network device, where the access network device has a function of an access network device behavior in the second aspect, where the function may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.

In a possible design, the structure of the access network device includes a receiving unit, a processing unit, and a sending unit, which may execute corresponding functions in the method example of the second aspect, for specific reference, detailed description in the method example is given, and details are not repeated here.

In one possible design, the access network device includes a transceiver, a processor, and a memory, where the transceiver is used for performing communication interaction with a terminal device, and the processor is configured to support the access network device to perform the corresponding functions in the above-described method example of the second aspect. The memory is coupled to the processor and retains program instructions and data necessary for the access network equipment.

In an eighth aspect, an embodiment of the present application provides a first terminal device, where the first terminal device has a function of a behavior of the first terminal device in the third aspect, and the function may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.

In a possible design, the structure of the first terminal device includes a receiving unit, a processing unit, and a sending unit, and these units may perform corresponding functions in the method example of the third aspect, for specific reference, detailed description in the method example is given, and details are not repeated here.

In one possible design, the first terminal device has a structure that includes a transceiver, a processor, and a memory, where the transceiver is used for performing communication interaction with the terminal device, and the processor is configured to support the first terminal device to perform the corresponding functions in the third aspect method example. The memory is coupled to the processor and retains program instructions and data necessary for the first terminal device.

In a ninth aspect, an embodiment of the present application further provides a communication system, where the communication system includes an access network device and a plurality of terminal devices. The access network device has the corresponding functionality of the method example of the first aspect or the second aspect, there is at least one first terminal device of the plurality of terminal devices, and the first terminal device has the corresponding functionality of the method example of the third aspect.

In a tenth aspect, embodiments of the present application further provide a computer storage medium, where a software program is stored, and when the software program is read and executed by one or more processors, the method provided by any one of the first to fifth aspects may be implemented.

In the embodiment of the application, when the access network device does not detect the data transmitted by the terminal device based on the GFT mode successfully, the access network device instructs the terminal device to retransmit the transmitted data, and determines a second channel resource used by the terminal device when retransmitting according to a first channel resource used by the terminal device for transmission at this time; after acquiring the indication of retransmission, the terminal device determines the second channel resource used in retransmission according to the first channel resource, and retransmits the second channel resource; since the access network device has already determined the second channel resource, the data sent by the terminal device may be obtained according to the retransmission signal received on the second channel resource. By adopting the method, on the premise of ensuring the data transmission efficiency of the terminal equipment adopting the GFT mode, additional channel resources are not required to be added for transmitting the inspection data packet and the like, and the utilization rate of the channel resources is improved.

Drawings

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application;

fig. 2 is a flowchart of a data transmission method according to an embodiment of the present application;

fig. 3 is a flowchart of another data transmission method according to an embodiment of the present application;

fig. 4 is a flowchart of another data transmission method provided in the embodiment of the present application;

fig. 5 is a structural diagram of an access network device according to an embodiment of the present application;

fig. 6 is a block diagram of another access network device according to an embodiment of the present application;

fig. 7 is a structural diagram of a first terminal device according to an embodiment of the present application;

fig. 8 is a structural diagram of a third terminal device according to an embodiment of the present application;

fig. 9 is a block diagram of another access network device according to an embodiment of the present application;

fig. 10 is a block diagram of still another access network device according to an embodiment of the present application;

fig. 11 is a structural diagram of another first terminal device according to an embodiment of the present application.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The embodiment of the application provides a data transmission method and a data transmission device, which are used for solving the problem that the channel utilization rate of a communication system adopting two transmission modes of GBT and GFT in the prior art is low. The method and the device are based on the same inventive concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

Hereinafter, some users in the present application will be explained to facilitate understanding by those skilled in the art.

1) The access network device related to the embodiment of the present application is a device for accessing a terminal device to a wireless network, and includes but is not limited to: a Base Station, an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a Home Base Station (e.g., Home evolved Node B, or Home Node B, HNB), a BaseBand Unit (BBU), an Access Point (Access Point, AP), and the like.

2) A terminal device, also referred to as a User Equipment (UE), is a device that provides voice and/or data connectivity to a User, such as a handheld device with wireless connectivity, a vehicle-mounted device, a wearable device, a computing device, a Mobile Station (MS) or other processing device connected to a wireless modem, and a Mobile terminal that communicates with one or more core networks via a radio access network.

3) The term "plurality" in the embodiments of the present application means two or more.

4) And/or, describing the association relationship of the associated objects, indicating that three relationships may exist. For example, a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

In addition, it is to be understood that the terms first, second, etc. in the description of the present application are used for distinguishing between the descriptions and not necessarily for describing a sequential or chronological order.

The following is a brief description of a conventional joint detection method involved in the embodiments of the present application, by way of an example.

A terminal device 1 adopting GBT mode sends u data to be sent_GBSaid terminal device 1 will said u_GBAfter Forward Error Correction (FEC) coding and Cyclic Redundancy Check (CRC), the obtained code words are equally divided into K data packets with the same length, which are denoted as a₁，a₂，…，a_KAnd K is a positive integer greater than 1. Another terminal device 2 adopting GBT mode transmits data u to be transmitted_GFAfter FEC encoding and CRC, an AND a is obtained_kData packet b of the same length₁And K is a positive integer less than or equal to K.

The terminal equipment 1 adds the pilot frequency with the same length to each data packet, namely, to a_kAdding pilot p_GB，k(ii) a Terminal equipment 2 is also pair b₁Addition of p and_GB，kpilots p of the same length_GFAnd p is_GB，kAnd p_GFAre orthogonal to each other.

Then the terminal device 1 transmits the K data packets on the K channel resources scheduled by the access network device; the terminal device 2 also selects a channel resource to transmit the data packet b₁Here, it is assumed that the data packet selected by the terminal device 2 is the 3 rd channel resource on the K channel resources. Then the access network equipment receives the signal y on the K channel resources₁，y₂，…，y_KConforms to the following formula 1

Wherein H_1，kFor channel fading, H, of terminal 1 on the k-th channel resource_2.3For channel fading of terminal device 2 on the 3 rd channel resource, n_kIs the local noise of the access network device when receiving the signal on the k channel resource.

The access network equipment firstly respectively obtains H pairs through channel estimation_1，k、H_2，3Is estimated value of

Then to y_kDetecting to obtaina_kResult of detection of

And to y₃Performing joint detection to obtain a₃、b₁Result of detection of

Then the access network equipment passes the detection result through the decoders corresponding to the two terminal equipment to respectively obtain the detection result of the terminal equipment 1

And

and the decoder corresponding to each terminal device is the decoder corresponding to the FEC code used by the corresponding terminal device.

Fig. 1 shows a possible communication system to which the data transmission method provided in the embodiment of the present application is applied, and referring to fig. 1, the communication system includes an access network device and a plurality of terminal devices, where among the plurality of terminal devices, there is a terminal device that transmits data to the access network device in a GFT manner, and there is a terminal device that transmits data to the access network device in a GBT manner.

Wherein, the process of the terminal device adopting the GBT mode (hereinafter referred to as GB _ terminal device) sending data to the access network device is:

the GB _ terminal equipment sends a scheduling request to the access network equipment;

the access network equipment schedules channel resources for the GB _ terminal equipment according to the scheduling request and feeds back the channel resources containing scheduling to the GB _ terminal equipment through scheduling permission;

and the GB _ terminal equipment sends data to the access network equipment on the channel resources scheduled by the access network equipment.

The process of sending data to the access network device by the terminal device adopting the GFT mode (hereinafter referred to as GF _ terminal device) is as follows:

and after determining that data needs to be sent to the access network equipment, the GF _ terminal equipment automatically selects channel resources and directly sends the data on the selected channel resources.

Since the channel resources used by the GF _ terminal device in transmitting data are random, in the communication system, there may be several scenarios:

the first scenario is: one GB _ terminal device and one GF _ terminal device use the same channel resource to transmit data;

in the second scenario: a plurality of GF _ terminal devices use the same channel resource to transmit data and different pilot frequencies;

in a third scenario, multiple GF _ terminal devices transmit data and the same pilot using the same channel resources.

In the second and third scenarios, a GB _ terminal device may also be included to transmit data using the channel resource.

In the above communication system, the determining, by the access network device, whether a GF _ terminal device exists through activity detection specifically includes:

the access network equipment detects a pilot frequency sent by terminal equipment in a communication system, and judges whether the terminal equipment sending the pilot frequency is GF _ terminal equipment or not according to the pilot frequency; when the access network equipment determines that the terminal equipment sending the pilot frequency is adopted GF _ terminal equipment according to the received certain pilot frequency, the channel resource used by the GF _ terminal equipment for sending data is determined as the channel resource for receiving the pilot frequency.

Therefore, the access network device may determine which of the above scenarios the current scenario belongs to through the activity detection.

For example: the access network device determines that a certain channel resource is a channel resource used by the GF _ terminal device through activity detection, and determines that the channel resource is scheduled to the GB _ terminal device in the communication system by the channel resource according to the resource configuration of the access network device, so that the access network device determines that the current scene is the first scene.

For another example, the access network device receives multiple pilots on a certain channel resource through activity detection, so the access network device may determine that multiple GF _ terminal devices use the channel resource, and at this time, the access network device determines that the current scene is the second scene.

In the first and second scenarios described above, signal collisions may occur. Therefore, in the above two scenarios, the access network device may recover the data sent by each terminal device as much as possible by using a conventional joint detection method, that is, the access network device obtains the channel information of each terminal device through channel estimation, and recovers the data sent by each terminal device as much as possible from the signal received from one channel resource according to the channel information.

Since the channel resource selected by the GF _ terminal device when transmitting data is random and the pilot frequency selected and transmitted at the same time is also random, the communication system may have a scenario in which a plurality of GF _ terminal devices all select the same pilot frequency and select the same channel resource for transmission, that is, the third scenario. In this scenario, pilot collisions may occur. The access network device can only detect one pilot frequency on the channel resource through the activity detection, so that the access network device cannot determine how many GF _ terminal devices are according to the pilot frequency, and only considers that only one GF _ terminal device currently uses the channel resource, however, the access network device receives a signal on the channel resource and contains data of a plurality of GF _ terminal devices, and therefore, through the joint detection method, the detection fails certainly, and the data sent by each GF _ terminal device cannot be recovered from the received signal.

However, since the selection of channel resources and pilots is determined by the GF _ terminal device itself and the access network device is not informed before transmitting data. Therefore, from the perspective of the access network device, the access network device can only determine, through activity detection, that there is a GF _ terminal device transmitting data using a certain channel resource in the current communication system, and cannot determine which of the above scenarios is the current scenario. Therefore, the access network device can only recover the data sent by each terminal device from the signal received on the channel resource mechanically by the above-mentioned joint detection method as much as possible.

Due to the limited error correction capability in the joint detection method, it always happens that the access network device cannot recover part or all of the data sent by the terminal device (also called as not detecting the data of the corresponding terminal device or failing to detect), and in addition, if the pilot collision occurs in the current scene, the access network device must not recover the data of the GF _ terminal devices. At present, in order to ensure the data transmission efficiency of the terminal device in the communication system, in the embodiment of the present application, a round Automatic Repeat reQ terminal device st (HARQ) mode is used to indicate a data sender with a detection failure to perform retransmission.

Since the retransmission process of the GB _ terminal device is the same as the conventional scheme when the access network device fails to detect data of the GB _ terminal device, this is not introduced in the present application, and this embodiment of the present application mainly describes the retransmission process of the GF _ terminal device when the data detection of the GF _ terminal device fails.

The embodiment of the application provides a data transmission method, which is applicable to a first scenario in the communication system, wherein the communication system comprises an access network device and a plurality of terminal devices. Referring to fig. 2, the flow of the method includes:

s201: the first terminal equipment sends first data to the access network equipment through the first channel resources based on the GFT mode, and the second terminal equipment also sends second data to the access network equipment through the first channel resources based on the GBT mode.

Wherein the first channel resource is selected by the first terminal device and is also scheduled by the access network device to the second terminal device.

S202: after determining that the first data and the data are respectively sent by the first terminal device and the second terminal device through the same first channel resource, the access network device jointly detects the second data of the first data core on the first channel resource.

Since the first channel resource is scheduled by the access network device to the second terminal device, in this step, the access network device may directly determine that the second terminal device will send the second data through the first channel resource. The access network device may determine, through activity detection, that the first terminal device also selects the first channel resource, and send the first data through the first channel resource.

Optionally, jointly detecting the first data and the second data on the first channel resource includes:

the access network device performs joint detection on the signals received on the first channel resources in an attempt to detect the first data and the second data. For a specific process of the access network device performing joint detection on the first signal, reference may be made to the above description of the joint detection method, which is not described herein again.

S203: the access network equipment determines that the first data is not detected, and the access network equipment instructs the first terminal equipment to retransmit the first data.

Due to the limitation of the joint detection method, the access network device may fail to detect, and the data sent by the first terminal device or the second terminal device is not detected. When the access network device does not detect the data sent by the first terminal device or the second terminal device, the access network device may instruct the first terminal device or the second terminal device to retransmit the data sent by the first terminal device or the second terminal device. After the access network device does not detect the second data, the access network device instructs the second terminal device to perform retransmission and subsequent processes, which are the same as the conventional data retransmission method, and are not repeated in the embodiments of the present application.

As is well known, when a data retransmission technique is used in the communication system, after a terminal device sends data to an access network device, the access network device may detect a received signal, but whether the detection is successful or not, the access network device needs to notify the terminal device of a detection result to indicate whether the terminal device needs to retransmit the data. Optionally, when the detection is successful, the access network device may send a successful response message to the terminal device, and the terminal device receives the successful response message, that is, does not perform retransmission on the data; when the detection fails, the access network device may send a failure response message to the terminal device, and the terminal device performs retransmission for the data after receiving the failure response message, or the access network device may not send a success response message to the terminal device, and the terminal device does not receive the success response message, that is, it is determined that the detection of the access network device fails and then performs retransmission for the data.

Optionally, based on the above description, the access network device may instruct the first terminal device to retransmit the first data in the following two ways:

Optionally, the failure response message may be a Negative Acknowledgement (NACK) command, and the success response message may be a correct Acknowledgement (ACK) command.

Optionally, the access network device may send the failure response message or the success response message through a control channel.

S204: and the access network equipment determines a first channel resource used by the first terminal equipment during retransmission according to the first channel resource.

Optionally, the access network device determines the second channel resource according to a preset first mapping relationship and the first channel resource; the first mapping relationship is used for representing a one-to-one correspondence relationship between the channel resources used by the first terminal device in the current transmission and the channel resources used in the next retransmission.

Optionally, the first mapping relationship may be represented by formula S_i+1＝f(S_i) Is represented by the formula (I), wherein the S_iChannel resources, S, used for the current transmission of the first terminal device_i+1And the channel resource used for the next retransmission of the first terminal equipment is obtained.

In order to ensure that the second channel resource determined by the access network device is completely consistent with the channel resource selected by the first terminal device when the first data is retransmitted, the first terminal device also needs to select the second channel resource according to the first mapping relationship. Optionally, the first mapping relationship is agreed between the access network device and the first terminal device.

Optionally, the first mapping relationship may be only applicable to determining channel resources used when the first terminal device retransmits. In this case, the access network device needs to maintain the corresponding first mapping relationships for a plurality of terminal devices in the GFT mode in the communication system, which is not favorable for the access network device to maintain and manage the plurality of first mapping relationships.

In order to avoid the foregoing situation, optionally, the first mapping relationship is adapted to determine that all terminal devices adopting the GFT method perform retransmission on the used channel resources.

It should be noted that, in the embodiment of the present application, the sequence of the access network devices S204 and S203 is not limited, and fig. 2 is only one possible execution sequence.

S205: after the first terminal device obtains the indication of the access network device for retransmitting the first data, the second channel resource used by the first terminal device for retransmission is determined according to the first channel resource.

Optionally, two manners of instructing, by the access network device, the first terminal device to perform retransmission on the first data, and correspondingly, the acquiring, by the first terminal device, an instruction of the access network device to perform retransmission on the first data also includes the following two manners:

the first mode is as follows: the first terminal equipment receives the failure response message sent by the access network equipment;

the second mode is as follows: and the first terminal equipment determines that a successful response message aiming at the first data sent by the access network equipment is not received.

Optionally, because the access network device may send the failure response message or the success response message through a control channel, correspondingly, the first terminal device may monitor in the control channel, so as to obtain the indication that the access network device retransmits the first data.

As can be seen from the description in S204, in order to ensure that the second channel resource determined by the first terminal device and the second channel resource determined by the access network device are completely consistent, the first terminal device and the access network device need to determine the second channel resource by using the same method. When the access network device determines the second channel resource through the first mapping relationship, the first terminal device also needs to determine the second channel resource through the first mapping relationship. The specific process of determining the second channel resource by the first terminal device may refer to step S204, which is not described herein again.

S206: and the first terminal equipment retransmits the first data to the access network equipment through the second channel resource.

Optionally, the first terminal device may perform S206 in the following manners:

the first mode is as follows: the first terminal device retransmits the first data, for example, the first terminal device re-encodes and transmits the first data; or the re-execution of the S201.

Optionally, the first terminal device sends a first data packet containing the first data when executing S201; accordingly, the first terminal device may transmit a second data packet containing the first data, where the second data packet is a data packet that enables the access network device to decode independently of the first data packet. In this way, the access network device may directly detect the received second signal on the second channel resource without considering the first signal, so as to obtain the first data.

The second mode is as follows: the first terminal device transmits check data, for example incremental redundancy (incremental redundancy).

S207: and the access network equipment obtains the first data sent by the first terminal equipment according to the retransmission signal received on the second channel resource.

Optionally, when the first terminal device retransmits in the first manner, the access network device may perform detection or joint detection on the retransmission signal only to obtain the first data sent by the first terminal device; or the access network device may combine the retransmission signal and a signal (initial transmission signal) received on the first channel resource, and perform detection or joint detection on the combined signal to obtain the first data.

Optionally, when the first terminal device retransmits in the second manner, the access network device may perform a check process on the initial transmission signal according to the retransmission signal, so as to obtain the first data.

Optionally, if the access network device still fails to detect this time, then the access network device continues to instruct the first terminal device to retransmit the first data until the access network device succeeds in detecting, so as to obtain the first data, which can ensure the security of data transmission of the first terminal device.

By adopting the method provided by the embodiment of the application, when the access network equipment does not detect the data which is successfully sent by the terminal equipment based on the GFT mode, the access network equipment indicates the terminal equipment to retransmit the sent data, and determines the second channel resource used by the terminal equipment in the retransmission according to the first channel resource used by the terminal equipment in the current transmission; after the terminal equipment acquires the indication of retransmission, the second channel resource used in retransmission is determined according to the used first channel resource, and retransmission is carried out through the second channel resource; since the access network device has already determined the second channel resource, the data sent by the terminal device may be obtained according to the retransmission signal received on the second channel resource. By adopting the method, on the premise of ensuring the data transmission efficiency of the terminal equipment adopting the GFT mode, additional channel resources are not required to be added for transmitting the inspection data packet and the like, and the utilization rate of the channel resources is improved.

According to the knowledge about the multiple access channels in the information theory, after the signal collision problem occurs, when the access network device simultaneously detects the data of the terminal device (GF _ terminal device) adopting the GFT mode and the terminal device (GB-terminal device) adopting the GBT mode by a joint detection method, the transmission code rates (respectively denoted as R) of the GF-terminal device and the GB-terminal device_GFAnd R_GB) The following relationship is satisfied:

wherein H_GFChannel fading, H, experienced by data transmissions sent for the GF _ terminal device to the access network device_GBChannel fading, σ, experienced by data transmission to the access network device sent by the GB _ terminal device²Is the variance of local noise, P_GFIs the transmission power, P, of the GF _ terminal device_GBIs the transmission power P of the GB _ terminal equipment_GB。

From the above relationship, one can obtain: in one aspect, R_GFIs proportional to the logarithm of the transmit power of the GF _ terminal device; in another aspect, R_GFAnd R_GBThe maximum value of the sum is proportional to the total transmission power of the GF _ terminal device and the GB _ terminal device. With the two aspects described above, the following conclusions can be drawn: in order to reduce the probability of errors occurring in the data transmission of the GF _ terminal device and increase the success rate of the access network device detecting the data of the GF _ terminal device, the transmission power and/or the transmission code rate of the GB _ terminal device should be reduced.

In the above embodiment, the access network device may determine the second channel resource used by the first terminal device for retransmitting the first data, and therefore, the access network device may accurately determine whether the second channel resource is scheduled to another terminal device based on the GBT scheme (hereinafter referred to as a third terminal device). If not already scheduled to the third terminal device, the signal received by the access network device on the second channel resource only carries the data retransmitted by the first terminal device; if the first data is scheduled to the third terminal device, in order to improve the success rate of obtaining the first data by the access network device according to the signal received on the second channel resource, it can be known from the above conclusion that the third device should reduce the transmission power and/or the transmission code rate.

With the above description, optionally, after step S204, before step S207(S206), the method further includes S208 and S209.

S208: the access network device determines that the second channel resource has been scheduled to a third terminal device; of course, the third terminal device generates third data to the access network device in a GBT manner.

S209: and the access network equipment sends a transmission instruction to the third terminal equipment, wherein the transmission instruction is used for instructing the third terminal equipment to reduce the sending power and the transmission code rate when sending the third data to the access network equipment through the second channel resource.

And the third terminal device reduces the specific process of the transmission power and/or the transmission code rate when sending the third data to the access network device through the second channel resource according to the transmission indication, which is described in detail later.

Through the above steps, the access network device instructs the third terminal device using the same channel resource to reduce the transmission power and/or the transmission code rate when performing retransmission with the first terminal device, so that the probability of data transmission error of the first terminal device can be reduced, and the success rate of the access network device for detecting the data of the first terminal device can be improved.

The embodiment of the present application further provides another data transmission method, which is applicable to a second or third scenario in the communication system, where the communication system includes an access network device and a plurality of terminal devices. For clarity of the drawing, the plurality of terminal devices are simplified in fig. 3, and only the first terminal device and the second terminal device are taken as an example. Referring to fig. 3, the flow of the method includes:

s301: and the first terminal equipment and the second terminal equipment respectively send first data and second data to the access network equipment through the first channel resource based on the GFT mode.

S302: the access network device fails to jointly detect the second data of the first data core for the first channel resource.

When the communication system is in the second scenario, the access network device may determine, through activity detection, that the first terminal device and the second terminal device transmit respective data through the first channel resource.

In this scenario, the access network device performs joint detection on the signal (first signal) received on the first channel resource, and a situation of detection failure may occur, that is, the access network device cannot detect data sent by each of the two terminal devices, or the access network device detects data sent by one terminal device, but data sent by the other terminal device is not detected.

When the communication system is in a third scenario, or both the second scenario and the third scenario exist, the access network device may not determine how many terminal devices actually transmit their respective data through the first channel resource through activity detection. In the above scenario, a problem of pilot collision may occur, and therefore, the access network device performs joint detection on the first signal, and a situation of detection failure may certainly occur.

S303: and the access network equipment indicates the target terminal equipment in the first terminal equipment and the second terminal equipment to retransmit the transmitted data after the joint detection fails.

The target terminal device is at least one of the first terminal device and the second terminal device. At this time, the access network device instructs the first terminal device to retransmit the first data through the corresponding channel resource, and/or the access network device instructs the second terminal device to retransmit the second data through the corresponding channel resource. The channel resources corresponding to the first terminal device and the second terminal device are respectively determined by the access network device according to the first channel resources.

For example, in fig. 3, the target terminal devices are the first terminal device and the second terminal device.

In the above embodiment, since the access network device may determine all terminal devices (including terminal devices adopting the GFT mode) that use a certain channel resource, the access network device may instruct the terminal devices adopting the GFT mode to retransmit the transmitted data in two modes, i.e., sending a failure response message or not sending a success response message. However, in this embodiment, due to the pilot collision problem, the access network device cannot determine to use all terminal devices on the first channel resource. Therefore, when the access network equipment fails in the joint detection due to the pilot frequency collision problem, the access network equipment cannot adopt a failure response message to inform the terminal equipment sending the pilot frequency collision.

Based on the above description, optionally, in this embodiment, the instructing, by the access network device, the target terminal device to retransmit the data sent by the target terminal device includes:

Optionally, if the problem of pilot frequency collision is not considered, the access network device may also instruct the target terminal device to retransmit the transmitted data by sending a failure response message, where this process is the same as the corresponding process in the previous embodiment, and is not described again in the following.

S304: and the access network equipment determines that the target terminal equipment uses second channel resources during retransmission according to the first channel resources.

In order to avoid the signal collision of the terminal equipment which generates the signal collision in the data transmission during retransmission by using the same second channel resource; and also in order to avoid using the same second channel resource when retransmitting under the condition that the pilot collision does not occur or the signal collision does not occur currently for a plurality of terminal devices which adopt the GFT mode to send data to the access network device. Optionally, in this embodiment, when determining the second channel resource used by each terminal device during retransmission, a judgment factor, i.e., a pilot, may be added.

Optionally, the determining, by the access network device, a second channel resource used by the target terminal device during retransmission according to the first signal resource includes:

the access network equipment determines a first pilot frequency used by the target terminal equipment when the target terminal equipment sends data through the first channel resource;

the access network equipment determines the second channel resource according to a preset second mapping relation, the first channel resource and the first pilot frequency; the second mapping relation is used for representing the corresponding relation between the channel resource and the pilot frequency information used by the target terminal equipment in the current transmission and the channel resource used in the next retransmission; and in any two second mapping relations, when at least one of the two information used in the transmission is different, the channel resources used in the next retransmission are also different.

Optionally, when there are two target terminal devices, the access network device determines, by using the method, a second channel resource used by each target terminal device during retransmission, respectively. When the first pilots used by the two target terminal devices respectively when transmitting data through the first channel resources are different, the second channel resources used by the access network device when retransmitting the two target terminal devices are also different. This also avoids the phenomenon that the two target terminal devices collide again at the time of retransmission.

In any two of the second mapping relationships, when at least one of the two pieces of information used in the current transmission is different, the channel resources used in the next retransmission are also different, so as to avoid signal collision caused by using the same channel resources during retransmission by using two terminal devices with different pilots and different channel resources.

In order to facilitate the access network device to maintain and manage the second mapping relationship and avoid that the second channel resources obtained by using different second mapping relationships for different terminal devices during retransmission are the same, in this embodiment, the second mapping relationship is suitable for determining the channel resources used by all terminal devices adopting the GFT method during retransmission.

Optionally, the second mapping relationship may be represented by formula S_i+1＝f(S_i，p_i) Is represented by the formula (I), wherein the S_iThe channel resource, p, used for this transmission by the target terminal device (or terminal device using GFT mode)_iPilot frequency used for the current transmission of the target terminal equipment, S_i+1And the channel resource used for the next retransmission of the target terminal equipment is obtained.

For example, the second mapping relationship may be represented by the following formula two:

f(S_i，p_i)＝S_i+G+g(S_i，p_i)

wherein G is a preset resource interval, that is, a minimum distance between channel resources used for retransmission and initial transmission of the terminal device in the GFT mode, the function G () is a function for mapping a combination of the channel resources and the pilot frequency to the channel resources, and G () satisfies G (S)_i，p_i)≠g(S_i，p′_i) Wherein p is_i≠p′_i。

Through the above steps, the access network device may determine the second channel resource used by the target terminal device for retransmission, that is, may determine that information of retransmission of the data sent by the target terminal device is carried in a retransmission signal subsequently received on the determined second channel resource, so that the access network device may obtain the data sent by the target terminal device according to the retransmission signal.

In order to ensure that the second channel resource used by the target terminal device determined by the access network device during retransmission is completely consistent with the channel resource selected by the target terminal device during retransmission of the transmitted data, the target terminal device also needs to select the second channel resource used during retransmission according to the second mapping relationship. Optionally, the first mapping relationship is agreed between the access network device and the target terminal device (or a terminal device adopting a GFT mode).

S305: and after acquiring the indication of the access network equipment for retransmitting the data sent by the target terminal equipment, the target terminal equipment determines the second channel resource used by the target terminal equipment during retransmission according to the first channel resource.

For clarity and simplicity of fig. 3, the first terminal device executes S305 and S306 only as an example, and of course, the second terminal device also executes S305 and S306, and only these steps are omitted in fig. 3.

Optionally, corresponding to the manner in which the access network device instructs the target terminal device to perform retransmission on the transmitted data in S303, the manner in which the target terminal device obtains the instruction of the access network device to perform retransmission on the data transmitted by the target terminal device is as follows:

and the target terminal equipment determines that a successful response message aiming at the transmitted data sent by the access network equipment is not received.

Since the access network device sends the successful response message on the control channel, in this embodiment, the terminal device adopting the GFT mode keeps monitoring the control channel after sending data to the access network device, and determines whether to retransmit the sent data by determining whether to receive the successful response message for the sent data.

As can be seen from the description in S304, in order to ensure that the second channel resource determined by the target terminal device is completely consistent with the second channel resource used by the access network device when the target terminal device retransmits, the target terminal device and the access network device need to determine the second channel resource by using the same method. When the access network device determines the second channel resource through the second mapping relationship, the target terminal device also needs to determine the second channel resource through the second mapping relationship. The specific process of the target terminal device determining the second channel resource may refer to step S304, which is not described herein again.

S306: and the target terminal equipment retransmits the transmitted data to the access network equipment through the determined second channel resource.

Optionally, the pilot frequency used by the target terminal device when retransmitting the transmitted data is randomly selected from a preset pilot frequency set. In this way, it is also possible to reduce the probability that a plurality of target terminal apparatuses use the same pilot, thereby reducing the probability that a pilot collision occurs when the target terminal apparatuses retransmit transmitted data.

For example, the retransmitting, by the first terminal device, the first data to the access network device through the second channel resource includes:

the first terminal equipment randomly selects a second pilot frequency in a preset pilot frequency set, wherein the second pilot frequency is a pilot frequency used by the first terminal equipment when the first terminal equipment retransmits the first data to the access network equipment through the second channel resource;

and the first terminal equipment uses the second pilot frequency to send the first data to the access network equipment through the second channel resource.

In this embodiment of the present application, the access network device may fail to jointly detect the first signal due to pilot collision, and when the access network device obtains data of the target terminal device according to a retransmission signal obtained by retransmission of the target terminal device subsequently, the utilization rate of the first signal is low. Therefore, optionally, when the target terminal device retransmits the transmitted data to the access network device, the target terminal device retransmits the data that was transmitted last time, that is, transmits a data packet that carries the data that was transmitted last time and can be decoded by the access network device alone.

For example, when the first terminal device sends a first data packet including the first data to the access network device through the first channel resource, the retransmitting, by the first terminal device, the first data to the access network device through the determined second channel resource includes:

and the first terminal equipment sends a second data packet containing the first data to the access network equipment through the second channel resource, wherein the second data packet is a data packet which can enable the access network equipment to independently decode the first data packet.

By the method, when the target terminal equipment retransmits, the retransmitted data is equal to the initial data transmission to the access network equipment, so that the first signal is not considered any more in the process of detecting the retransmitted signal received by the access network equipment on the second channel resource, and the success rate of detecting the data sent by the target terminal equipment is improved.

S307: and the access network equipment obtains the data sent by the target terminal equipment according to the retransmission signal received on the second channel resource.

Since fig. 3 only shows that the first terminal device executes two steps S305 and S306, accordingly, fig. 3 also only shows that the access network device executes S307 for the first terminal device, that is, the access network device obtains the first data according to the retransmission signal received on the second channel resource used by the first terminal device.

Optionally, when executing S307, the access network device includes: and the access network equipment detects the retransmission signal to obtain the data sent by the target terminal equipment.

For example, the access network device detects the retransmission signal to obtain a data packet containing data retransmitted by the target terminal device;

and the access network equipment decodes the data packet independently to obtain the data sent by the target terminal equipment.

By the method, the access network equipment does not consider the first signal any more in the process of detecting the retransmission signal received on the second channel resource, and the success rate of detecting the data sent by the target terminal equipment is improved.

By adopting the method provided by the embodiment of the application, when the access network equipment determines that the terminal equipment adopting the GFT mode sends data to the access network equipment and the detection is not successful, the access network equipment can instruct the terminal equipment to carry out retransmission, and determines the second channel resource used by the terminal equipment during retransmission according to the first channel resource used by the terminal equipment; after the terminal equipment acquires the indication of retransmission, the second channel resource used in retransmission is determined according to the used first channel resource, and retransmission is carried out through the second channel resource; since the access network device has already determined the second channel resource, the data sent by the terminal device may be obtained according to the signal received on the second channel resource. By adopting the method, on the premise of ensuring the data transmission efficiency of the terminal equipment adopting the GFT mode, the transmission of the inspection data packet and the like without adding other channel resources is not needed, and the utilization rate of the channel resources is improved.

Optionally, after step S304, before step S307(S306), the method further includes S308 and S309.

S308: and the access network equipment determines that the second channel resource is scheduled to a third terminal equipment needing to send third data.

Wherein the third data is transmitted based on a grant transmission GBT scheme.

S309: and the access network equipment sends a transmission instruction to the third terminal equipment, wherein the transmission instruction is used for instructing the third terminal equipment to reduce the sending power and/or the transmission code rate when sending the third data to the access network equipment through the second channel resource.

Through the above steps, the access network device instructs the third terminal device using the same channel resource to reduce the transmission power and/or the transmission code rate when retransmitting with one of the at least one terminal device, so that the probability of data transmission error of the terminal device can be reduced, and the success rate of the access network device for detecting the data of the terminal device can be improved.

For clarity of description and illustration, in the above embodiment, only two terminal devices send data to the access network through the first channel resource is taken as an example, and naturally, in an actual scenario, there are more than two terminal devices that send respective data to the access network device through the first channel resource based on the GFT method.

For example, when there are 3 terminal devices, namely, a first terminal device, a second terminal device, and a third terminal device, that send first data, second data, and third data through a first channel resource based on GFT, respectively, an access network device jointly detects that the three data fail, and does not detect the first data and the second data, then the access network device uses the first terminal device and the second terminal device as a target terminal device, and the subsequent process may refer to the above-mentioned embodiment, which is not described herein again.

Based on the above embodiments, an embodiment of the present application further provides a data transmission method, where the method is applied to the communication system shown in fig. 1, and referring to fig. 4, a flow of the method includes:

s401: and the third terminal equipment receives the transmission indication sent by the access network equipment.

Wherein the transmission indication is used to indicate the third terminal device to reduce the transmission power and/or the transmission code rate when sending the third data to the access network device through the second channel resource.

Based on the above embodiments, it can be known that, after the joint detection of the received first signal on the first channel resource fails, the access network device instructs at least one terminal device adopting the GFT method to retransmit the data that is sent by the access network device, and determines the second channel resource used by each terminal device during retransmission.

After the access network device determines the second channel resources used by each terminal device during retransmission, whether each determined second channel resource is scheduled to other terminal devices is judged; after the access network device determines that the second channel resource used when the first terminal device retransmits is scheduled to the third terminal device, the access network device sends the transmission indication to the third terminal device, so that when the third terminal device sends the third data through the second channel resource, the sending power and/or the transmission code rate can be reduced, the probability of data transmission errors of the first terminal device can be reduced, and the success rate of the access network device detecting the data sent by the first terminal device can be improved.

S402: and the third terminal equipment reduces the sending power and/or the transmission code rate when the third terminal equipment sends third data to the access network equipment through the second channel resource according to the transmission indication.

In the embodiment of the present application, the third terminal device may adopt various conventional methods to reduce the transmission power when transmitting the third data, and therefore, the detailed description is omitted here.

Optionally, the reducing, by the third terminal device, the transmission rate when the third terminal device sends the third data through the second channel resource according to the transmission instruction includes:

the third terminal equipment acquires partial data in the third data according to the transmission instruction;

and the third terminal equipment sends the partial data to the access network equipment through the second channel resource.

By the above method, the third terminal device may reduce the data amount of the third data to be transmitted, and therefore, the transmission code rate of the third terminal device when transmitting the third data through the second channel resource is reduced.

Optionally, the obtaining, by the third terminal device, partial data in the third data includes:

the third terminal device may select the partial data in the third data by using a preset algorithm. The partial data may be a continuous data segment in the third data, or may be composed of a plurality of discontinuous data, which is not limited in this application.

Optionally, when the access network device sends the transmission instruction, the transmission instruction may carry the reduction transmission code rate multiple D, that is, the transmission instruction includes the reduction transmission code rate multiple D, where D is a number greater than 1. In this case, the third terminal device obtains partial data in the third data according to the transmission instruction, including:

and the third terminal equipment selects the partial data with the length of 1/D of the third data from the third data according to the transmission indication.

Optionally, the third terminal device sends the partial data, including multiple methods:

Because the access network device may generate a data decoding error on some data bits when detecting the fourth data, by the third method, the access network device may check the data with the decoding error through the repeated partial data supplemented in the fourth data, thereby improving the accuracy of the partial data decoded by the access network device and improving the transmission reliability of the partial data.

By adopting the method provided by the embodiment of the application, the third terminal device can reduce the sending power and/or the transmission code rate when the third terminal device sends the third data to the access network device through the second channel resource, so that the probability of errors occurring in the data transmitted by the first terminal device and retransmitted by using the second channel resource can be reduced, and the success rate of the access network device detecting the data sent by the first terminal device can be improved.

Based on the foregoing embodiments, an embodiment of the present application further provides an access network device, where the access network device applies the communication system shown in fig. 1, to implement the data transmission method shown in fig. 2, and referring to fig. 5, the access network device 500 includes: a processing unit 501, a transmitting unit 502, a receiving unit 503, wherein,

a processing unit 501, configured to determine that a first terminal device and a second terminal device respectively send first data and second data through a same first channel resource, where the first data is transmitted based on a GFT (license exempt transmission) mode; the second data is transmitted based on a GBT (guaranteed bit rate) mode;

jointly detecting the first data and the second data on the first channel resources; and determining that the first data is not detected; and

a sending unit 502, configured to instruct the first terminal device to perform retransmission on the first data through a second channel resource, where the second channel resource is determined based on the first channel resource;

a receiving unit 503, configured to receive a retransmission signal on the second channel resource;

the processing unit 501 is further configured to obtain the first data according to the retransmission signal received on the second channel resource.

Optionally, when instructing the first terminal device to retransmit the first data, the sending unit 502 is specifically configured to:

sending a failure response message to the first terminal equipment; the failure response message is used to notify the first terminal device that the processing unit 501 does not detect the first data, and instruct the first terminal device to retransmit the first data; or

Not sending a successful response message for the first data to the first terminal device to indicate the first terminal device to retransmit the first data; wherein the successful response message is used to notify the first terminal device that the processing unit 501 has detected the first data.

Optionally, the second channel resource is determined by:

the processing unit 501 determines the second channel resource according to a preset first mapping relationship and the first channel resource; the first mapping relationship is used for representing a one-to-one correspondence relationship between the channel resources used by the first terminal device in the current transmission and the channel resources used in the next retransmission.

Optionally, the first mapping relationship is agreed between the access network device and the first terminal device.

Optionally, the processing unit 501 is further configured to:

after determining that the first data is not detected, determining that the second channel resource is scheduled to a third terminal device needing to send third data before obtaining the first data according to a retransmission signal received on the second channel resource; the third data are transmitted based on a GBT mode;

the sending unit 502 is further configured to send a transmission instruction to the third terminal device, where the transmission instruction is used to instruct the third terminal device to reduce the sending power and/or the transmission code rate when sending the third data to the access network device through the second channel resource.

The access network device provided by the embodiment of the application can indicate the terminal device to retransmit when it is determined that the terminal device adopting the GFT mode transmits data to the access network device and the detection is not successful, and determine the second channel resource used by the terminal device when the terminal device retransmits according to the first channel resource used by the terminal device. Since the access network device has already determined the second channel resource, the data sent by the terminal device may be obtained according to the signal received on the second channel resource. By adopting the access network equipment, the communication system can transmit the inspection data packet without adding extra channel resources on the premise of ensuring the data transmission efficiency of the terminal equipment adopting the GFT mode, and the like, thereby improving the utilization rate of the channel resources.

Based on the above embodiments, an embodiment of the present application further provides an access network device, where the access network device is applied to the communication system shown in fig. 1, and is used to implement the data transmission method shown in fig. 3. Referring to fig. 6, the access network apparatus 600 includes: a processing unit 601, a transmitting unit 602, a receiving unit 603, wherein,

a processing unit 601, configured to determine that joint detection of first data and second data on a first channel resource fails, where the first data is sent by a first terminal device based on a GFT (unlicensed transmission) scheme, and the second data is sent by a second terminal device based on the GFT scheme;

a sending unit 602, configured to instruct a target terminal device of the first terminal device and the second terminal device to retransmit data sent by the target terminal device through a second channel resource, where the second channel resource is determined by the processing unit 601 based on the first channel resource, and the target terminal device is at least one of the first terminal device and the second terminal device;

a receiving unit 603, configured to receive a retransmission signal on the second channel resource;

the processing unit 601 is further configured to obtain data sent by the target terminal device according to the retransmission signal received on the second channel resource.

Optionally, when instructing the target terminal device to retransmit the data sent by the target terminal device, the sending unit 602 is specifically configured to:

not sending a successful response message to the target terminal equipment to indicate the target terminal equipment to retransmit the data sent by the target terminal equipment; wherein, the successful response message is used to notify the target terminal device that the access network device has detected the data sent by the target terminal device.

Optionally, the second channel resource is determined by:

the processing unit 601 determines a first pilot used by the target terminal device when transmitting data through the first channel resource;

the processing unit 601 determines the second channel resource according to a preset second mapping relationship, the first channel resource and the first pilot; the second mapping relation is used for representing the corresponding relation between the channel resource and the pilot frequency information used by the target terminal equipment in the current transmission and the channel resource used in the next retransmission; and in any two second mapping relations, when at least one of the two information used in the transmission is different, the channel resources used in the next retransmission are also different.

Optionally, the second mapping relationship is agreed between the access network device and the target terminal device.

Optionally, the processing unit 601 is further configured to:

after determining that the joint detection of the first data and the second data on the first channel resource fails, determining that the second channel resource is scheduled to a third terminal device needing to send third data before obtaining data sent by the target terminal device according to the retransmission signal received on the second channel resource; wherein the third data is transmitted based on a GBT (guaranteed bit rate) mode;

the sending unit 602 is further configured to send a transmission instruction to the third terminal device, where the transmission instruction is used to instruct the third terminal device to reduce a sending power and/or a transmission code rate when sending the third data to the access network device through the second channel resource.

Optionally, when obtaining the data sent by the target terminal device according to the retransmission signal received on the second channel resource, the processing unit 601 is specifically configured to:

and detecting the retransmission signal to obtain the data sent by the target terminal equipment.

Based on the foregoing embodiments, an embodiment of the present application further provides a first terminal device, where the first terminal device is applied to the communication system shown in fig. 1, and is configured to implement the data transmission method shown in fig. 2 or fig. 3, with reference to fig. 7, where the first terminal device 700 includes: a processing unit 701, a receiving unit 702 and a transmitting unit 703, wherein,

a processing unit 701, configured to send first data to an access network device through a first channel resource based on a GFT (license exempt transmission) mode;

a receiving unit 702, configured to obtain an indication of the access network device to retransmit the first data;

the processing unit 701 is further configured to determine, according to the first channel resource, a second channel resource used when the first terminal device retransmits; and retransmitting the first data to the access network device through the second channel resource;

a sending unit 703 is configured to send the first data to the access network device, and retransmit the first data to the access network device.

Optionally, when acquiring the indication of the access network device to retransmit the first data, the receiving unit 702 is specifically configured to:

receiving a failure response message sent by the access network equipment; the failure response message is used for notifying the first terminal device that the access network device does not detect the first data, and instructing the first terminal device to retransmit the first data; or

Determining that a successful response message for the first data sent by the access network device is not received, wherein the successful response message is used for notifying the first terminal device that the access network device has detected the first data.

Optionally, when determining the second channel resource according to the first channel resource, the processing unit 701 is specifically configured to:

determining the second channel resource according to a preset first mapping relation and the first channel resource; the first mapping relationship is used for representing a one-to-one correspondence relationship between the channel resources used by the first terminal device in the current transmission and the channel resources used in the next retransmission.

determining a first pilot used in transmitting the first data to an access network device through the first channel resource;

determining the second channel resource according to a preset second mapping relation, the first channel resource and the first pilot frequency; the second mapping relationship is used for representing the corresponding relationship between the channel resource and the pilot frequency information used by the first terminal device in the current transmission and the channel resource used in the next retransmission; in any two second mapping relations, when at least one of the two information used in the transmission is different, the channel resources used in the next retransmission are also different;

the processing unit 701, when retransmitting the first data to the access network device through the second channel resource, is specifically configured to:

randomly selecting a second pilot frequency in a preset pilot frequency set, wherein the second pilot frequency is a pilot frequency used by the first terminal device when retransmitting the first data to the access network device through the second channel resource;

and sending the first data to the access network equipment through the second channel resource by using the second pilot frequency.

Optionally, the second mapping relationship is agreed between the access network device and the first terminal device.

Optionally, when the processing unit 701 retransmits the first data to the access network device through the second channel resource, specifically configured to:

retransmitting the first data to the access network device through the second channel resource.

After acquiring an indication of retransmission of access network equipment, a first terminal device according to the embodiment of the present application determines a second channel resource used in retransmission according to a first channel resource used in last transmission, and performs retransmission through the second channel resource; since the access network device has already determined the second channel resource, the data sent by the terminal device may be obtained according to the signal received on the second channel resource. Through the first terminal equipment, the communication system can transmit the inspection data packet and the like without adding extra channel resources on the premise of ensuring the data transmission efficiency of the terminal equipment adopting the GFT mode, and the utilization rate of the channel resources is improved.

Based on the foregoing embodiments, an embodiment of the present application further provides a third terminal device, where the third terminal device is applied to the communication system shown in fig. 1, and is configured to implement the data transmission method shown in fig. 2 or fig. 3, with reference to fig. 8, where the third terminal device 800 includes: a receiving unit 801, a processing unit 802, and a transmitting unit 803, wherein,

a receiving unit 801, configured to receive a transmission instruction sent by an access network device; wherein the transmission indication is used for indicating the third terminal device to reduce the transmission power and/or the transmission code rate when sending third data to the access network device through the second channel resource;

a processing unit 802, configured to reduce, according to the transmission indication, a transmission power and/or a transmission code rate of the third terminal device when sending the third data to the access network device through the second channel resource;

the sending unit 803 is configured to send the third data to the access network device.

Optionally, when reducing, according to the transmission instruction, a transmission code rate of the third terminal device when sending the third data through the second channel resource, the processing unit 802 is specifically configured to:

acquiring partial data in the third data according to the transmission instruction;

and sending the partial data to the access network equipment through the second channel resource.

Optionally, the transmission indication includes a reduction of a transmission code rate multiple D, where D is a number greater than 1;

the processing unit 802, when acquiring a part of the third data according to the transmission instruction, is specifically configured to:

and selecting the partial data with the length of 1/D of the third data from the third data according to the transmission indication.

Optionally, when sending the partial data to the access network device through the second channel resource, the processing unit 802 is specifically configured to:

continuing to supplement the partial data on the basis of the partial data until fourth data with the length equal to that of the third data is obtained;

and sending the fourth data to the access network equipment through the second channel resource.

The third terminal device provided by the embodiment of the application can reduce the transmission power and/or transmission code rate when the third data is sent to the access network device through the second channel resource, so that the probability of errors occurring in the data transmitted by the first terminal device and retransmitted by using the first channel resource can be reduced, and the success rate of the data sent by the first terminal device and detected by the access network device can be improved.

It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. The 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 integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit 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 may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) 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: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

Based on the foregoing embodiments, an embodiment of the present application further provides an access network device, configured to implement the data transmission method shown in fig. 2, and have the function of the access network device 500 shown in fig. 5, referring to fig. 9, where the access network device 900 includes: a transceiver 901, a processor 902 and a memory 903, wherein the transceiver 901, the processor 902 and the memory 903 are communicatively connected to each other.

The transceiver 901 is used for the terminal device to perform communication interaction.

The processor 902 is configured to implement the data transmission method shown in fig. 2, and includes:

determining that a first terminal device and a second terminal device respectively send first data and second data through the same first channel resource, wherein the first data are transmitted based on a GFT (license-free transmission) mode; the second data is transmitted based on a GBT (guaranteed bit rate) mode;

jointly detecting the first data and the second data on the first channel resources;

determining that the first data is not detected;

instructing the first terminal device to retransmit the first data over a second channel resource, the second channel resource being determined based on the first channel resource;

and obtaining the first data according to the retransmission signal received on the second channel resource.

Optionally, when instructing the first terminal device to retransmit the first data, the processor 902 is specifically configured to:

sending a failure response message to the first terminal equipment; the failure response message is used to notify the first terminal device that the processing unit does not detect the first data, and instruct the first terminal device to retransmit the first data; or

Not sending a successful response message for the first data to the first terminal device to indicate the first terminal device to retransmit the first data; wherein the successful response message is used to inform the first terminal device that the processing unit has detected the first data.

Optionally, when determining, according to the first channel resource, a second channel resource used by the first terminal device for retransmission, the processor 902 is specifically configured to:

Optionally, the processor 902 is further configured to:

after determining a second channel resource used by the first terminal device for retransmission according to the first channel resource, determining that the second channel resource is scheduled to a third terminal device needing to send third data before detecting the second signal; the third data are transmitted based on a GBT mode;

and sending a transmission instruction to the third terminal device, where the transmission instruction is used to instruct the third terminal device to reduce the sending power and/or the transmission code rate when sending the third data to the access network device through the second channel resource.

The memory 903 is used for storing programs and the like. In particular, the program may include program code comprising computer operating instructions. The memory 903 may include a Random Access Memory (RAM) and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory. The processor 902 executes the application program stored in the memory 903 to implement the above functions, thereby implementing the data transmission method shown in fig. 2.

The access network device provided by the embodiment of the application can indicate the terminal device to retransmit when it is determined that the terminal device adopting the GFT mode transmits data to the access network device and the detection is not successful, and determine the second channel resource used by the terminal device when the terminal device retransmits according to the first channel resource used by the terminal device. Since the access network device has already determined the second channel resource, the data sent by the terminal device may be obtained according to the signal received on the second channel resource. By adopting the access network equipment, the communication system can transmit the inspection data packet without adding extra channel resources on the premise of ensuring the data transmission efficiency of the terminal equipment adopting the GFT mode, and the like, thereby improving the utilization rate of the channel resources. Based on the foregoing embodiments, an access network device is further provided in the embodiments of the present application, configured to implement the data transmission method shown in fig. 3, and have the function of the access network device 600 shown in fig. 6, referring to fig. 10, where the access network device 1000 includes: a transceiver 1001, a processor 1002 and a memory 1003, wherein the transceiver 1001, the processor 1002 and the memory 1003 are communicatively coupled to each other.

The transceiver 1001 is configured to perform communication interaction with a terminal device.

The processor 1002 is configured to implement the data transmission method shown in fig. 3, and includes:

determining that joint detection of first data and second data on a first channel resource fails, wherein the first data is transmitted by a first terminal device based on a GFT (license exempt transmission) mode, and the second data is transmitted by a second terminal device based on a GFT mode;

instructing a target terminal device of the first terminal device and the second terminal device to retransmit data sent by the target terminal device through a second channel resource, where the second channel resource is determined based on the first channel resource, and the target terminal device is at least one of the first terminal device and the second terminal device;

and obtaining the data sent by the target terminal equipment according to the retransmission signal received on the second channel resource.

Optionally, when instructing the target terminal device to retransmit the data sent by the target terminal device, the processor 1002 is specifically configured to:

Optionally, when determining the second channel resource, the processor 1002 is specifically configured to:

determining a first pilot frequency used by the target terminal device when transmitting data through the first channel resource;

determining the second channel resource according to a preset second mapping relation, the first channel resource and the first pilot frequency; the second mapping relation is used for representing the corresponding relation between the channel resource and the pilot frequency information used by the target terminal equipment in the current transmission and the channel resource used in the next retransmission; and in any two second mapping relations, when at least one of the two information used in the transmission is different, the channel resources used in the next retransmission are also different.

Optionally, the processor 1002 is further configured to:

Optionally, when obtaining the data sent by the target terminal device according to the retransmission signal received on the second channel resource, the processor 1002 is specifically configured to:

The memory 1003 is used for storing programs and the like. In particular, the program may include program code comprising computer operating instructions. The memory 1003 may include a RAM, and may further include a non-volatile memory (non-volatile memory), such as at least one disk memory. The processor 1002 executes the program stored in the memory 1003 to implement the above functions, thereby implementing the data transmission method shown in fig. 3.

Based on the foregoing embodiments, an embodiment of the present application further provides a first terminal device, configured to implement the data transmission method shown in fig. 2 or fig. 3, and have the function of the first terminal device 700 shown in fig. 7, referring to fig. 11, where the first terminal device 1100 includes: the device comprises a transceiver 1101, a processor 1102 and a memory 1103, wherein the transceiver 1101, the processor 1102 and the memory 1103 are communicatively connected to each other.

The transceiver 1101 is configured to perform communication interaction with an access network device.

The processor 1102 is configured to implement the data transmission method shown in fig. 2 or fig. 3, and includes:

based on a GFT (license exemption transmission) mode, first data are sent to access network equipment through first channel resources;

after acquiring an instruction of the access network device for retransmitting the first data, determining a second channel resource used by the first terminal device for retransmission according to the first channel resource;

retransmitting the first data to the access network device over the second channel resources.

Optionally, when obtaining the indication of the access network device to retransmit the first data, the processor 1102 is specifically configured to:

Optionally, when determining the second channel resource according to the first channel resource, the processor 1102 is specifically configured to:

the processor 1102, when retransmitting the first data to the access network device through the second channel resource, is specifically configured to:

Optionally, when the processor 1102 retransmits the first data to the access network device through the second channel resource, specifically, is configured to:

The memory 1103 is used for storing programs and the like. In particular, the program may include program code comprising computer operating instructions. The memory 1103 may comprise RAM, and may also include non-volatile memory, such as at least one disk memory. The processor 1102 executes the application program stored in the memory 1103 to implement the above functions, thereby implementing the data transmission method shown in fig. 2 or fig. 3.

In summary, the embodiments of the present application provide a data transmission method and apparatus, where an access network device does not detect data that is successfully sent by a terminal device based on a GFT manner, and instructs the terminal device to retransmit the sent data, and determines, according to a first channel resource used by the terminal device for transmission this time, a second channel resource used by the terminal device for retransmission; after acquiring the indication of retransmission, the terminal device determines the second channel resource used in retransmission according to the first channel resource, and retransmits the second channel resource; since the access network device has already determined the second channel resource, the data sent by the terminal device may be obtained according to the retransmission signal received on the second channel resource. By adopting the method, on the premise of ensuring the data transmission efficiency of the terminal equipment adopting the GFT mode, additional channel resources are not required to be added for transmitting the inspection data packet and the like, and the utilization rate of the channel resources is improved.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims

1. A method of data transmission, comprising:

the access network equipment determines that a first terminal equipment and a second terminal equipment respectively send first data and second data through the same first channel resource, wherein the first data are transmitted based on a GFT (license-free transmission) mode; the second data is transmitted based on a GBT (guaranteed bit rate) mode;

the access network device jointly detects the first data and the second data on the first channel resource;

the access network device determining that the first data is not detected;

the access network device instructs the first terminal device to retransmit the first data through second channel resources, which are determined based on the first channel resources;

the access network equipment obtains the first data according to the retransmission signal received on the second channel resource;

after the access network device determines that the first data is not detected, before the access network device obtains the first data according to the retransmission signal received on the second channel resource, the method further includes:

the access network equipment determines that the second channel resource is scheduled to a third terminal equipment needing to send third data; the third data are transmitted based on a GBT mode; and the access network equipment sends a transmission instruction to the third terminal equipment, wherein the transmission instruction is used for instructing the third terminal equipment to reduce the sending power and/or the transmission code rate when sending the third data to the access network equipment through the second channel resource.

2. The method of claim 1, wherein the access network device instructing the first terminal device to retransmit the first data comprises:

the access network equipment sends a failure response message to the first terminal equipment; the failure response message is used for notifying the first terminal device that the access network device does not detect the first data, and instructing the first terminal device to retransmit the first data; or

The access network equipment does not send a successful response message aiming at the first data to the first terminal equipment so as to instruct the first terminal equipment to retransmit the first data; wherein the successful response message is used to notify the first terminal device that the access network device has detected the first data.

3. The method of claim 1 or 2, wherein the second channel resource is determined by:

the access network equipment determines the second channel resource according to a preset first mapping relation and the first channel resource; the first mapping relationship is used for representing a one-to-one correspondence relationship between the channel resources used by the first terminal device in the current transmission and the channel resources used in the next retransmission.

4. The method of claim 3, wherein the first mapping relationship is agreed upon by the access network device and the first terminal device.

5. A method of data transmission, comprising:

the access network equipment determines that joint detection of first data and second data on first channel resources fails, wherein the first data is sent by a first terminal equipment based on a GFT (message flow transmission) mode of unlicensed transmission, and the second data is sent by a second terminal equipment based on the GFT mode;

the access network device instructs a target terminal device of the first terminal device and the second terminal device to retransmit data sent by the target terminal device through a second channel resource, wherein the second channel resource is determined based on the first channel resource, and the target terminal device is at least one terminal device of the first terminal device and the second terminal device;

the access network equipment obtains data sent by the target terminal equipment according to the retransmission signal received on the second channel resource;

after the access network device determines that the joint detection of the first data and the second data on the first channel resource fails, before the access network device obtains the data sent by the target terminal device according to the retransmission signal received on the second channel resource, the method further includes:

the access network equipment determines that the second channel resource is scheduled to a third terminal equipment needing to send third data; wherein the third data is transmitted based on a GBT (guaranteed bit rate) mode;

and the access network equipment sends a transmission instruction to the third terminal equipment, wherein the transmission instruction is used for instructing the third terminal equipment to reduce the sending power and/or the transmission code rate when sending the third data to the access network equipment through the second channel resource.

6. The method of claim 5, wherein the access network device instructing the target terminal device to retransmit the data sent by the target terminal device comprises:

7. The method of claim 5, wherein the second channel resource is determined by:

8. The method of claim 7, wherein the second mapping relationship is agreed upon by the access network device and the target terminal device.

9. The method of any one of claims 5 to 8, wherein the obtaining, by the access network device, the data transmitted by the target terminal device according to the retransmission signal received on the second channel resource, comprises:

10. An access network device, comprising:

the processing unit is used for determining that a first terminal device and a second terminal device respectively send first data and second data through the same first channel resource, wherein the first data are transmitted based on a GFT (license-free transmission) mode; the second data is transmitted based on a GBT (guaranteed bit rate) mode; jointly detecting the first data and the second data on the first channel resources; and determining that the first data is not detected;

a sending unit, configured to instruct the first terminal device to perform retransmission on the first data through a second channel resource, where the second channel resource is determined based on the first channel resource;

a receiving unit, configured to receive a retransmission signal on the second channel resource;

the processing unit is further configured to obtain the first data according to a retransmission signal received on the second channel resource;

the processing unit is further configured to determine that the second channel resource is scheduled to a third terminal device that needs to send third data, after it is determined that the first data is not detected, before the first data is obtained according to a retransmission signal received on the second channel resource; the third data are transmitted based on a GBT mode;

the sending unit is further configured to send a transmission instruction to the third terminal device, where the transmission instruction is used to instruct the third terminal device to reduce the sending power and/or the transmission code rate when sending the third data to the access network device through the second channel resource.

11. The access network device of claim 10, wherein the sending unit, when instructing the first terminal device to retransmit the first data, is specifically configured to:

12. An access network device according to claim 10 or 11, characterised in that the second channel resources are determined by:

the processing unit determines the second channel resource according to a preset first mapping relation and the first channel resource; the first mapping relationship is used for representing a one-to-one correspondence relationship between the channel resources used by the first terminal device in the current transmission and the channel resources used in the next retransmission.

13. The access network device of claim 12, wherein the first mapping relationship is agreed upon by the access network device and the first terminal device.

14. An access network device, comprising:

a processing unit, configured to determine that joint detection of first data and second data on a first channel resource fails, where the first data is sent by a first terminal device based on a GFT (unlicensed transmission) scheme, and the second data is sent by a second terminal device based on the GFT scheme;

the processing unit is further configured to determine that the second channel resource is scheduled to a third terminal device that needs to send third data before obtaining data sent by a target terminal device according to a retransmission signal received on the second channel resource after determining that joint detection of the first data and the second data on the first channel resource fails; wherein the third data is transmitted based on a GBT (guaranteed bit rate) mode;

a sending unit, configured to instruct a target terminal device of the first terminal device and the second terminal device to perform retransmission on data sent by the target terminal device through a second channel resource, where the second channel resource is determined by the processing unit based on the first channel resource, and the target terminal device is at least one of the first terminal device and the second terminal device; the third terminal device is further configured to send a transmission instruction to the third terminal device, where the transmission instruction is used to instruct the third terminal device to reduce a transmission power and/or a transmission code rate when sending the third data to the access network device through the second channel resource;

the processing unit is further configured to obtain data sent by the target terminal device according to the retransmission signal received on the second channel resource.

15. The access network device of claim 14, wherein the sending unit, when instructing the target terminal device to retransmit the data sent by the target terminal device, is specifically configured to:

16. The access network device of claim 14, wherein the second channel resources are determined by:

the processing unit determines a first pilot frequency used by the target terminal device when transmitting data through the first channel resource;

the processing unit determines the second channel resource according to a preset second mapping relation, the first channel resource and the first pilot frequency; the second mapping relation is used for representing the corresponding relation between the channel resource and the pilot frequency information used by the target terminal equipment in the current transmission and the channel resource used in the next retransmission; and in any two second mapping relations, when at least one of the two information used in the transmission is different, the channel resources used in the next retransmission are also different.

17. The access network device of claim 16, wherein the second mapping relationship is agreed upon by the access network device and the target terminal device.

18. The access network device according to any one of claims 14 to 17, wherein the processing unit, when obtaining the data sent by the target terminal device according to the retransmission signal received on the second channel resource, is specifically configured to: