WO2016078054A1

WO2016078054A1 - Data transmission method and station supporting device-to-device communication

Info

Publication number: WO2016078054A1
Application number: PCT/CN2014/091790
Authority: WO
Inventors: 苏宏家; 朱俊; 林英沛
Original assignee: 华为技术有限公司
Priority date: 2014-11-20
Filing date: 2014-11-20
Publication date: 2016-05-26

Abstract

Provided are a data transmission method and a station supporting device-to-device communication. The method is executed by a station supporting device-to-device communication. The method comprises: determining a current state of a transmission channel at the current moment; when the current state is an idle state, initiating data transmission; and when the current state is a busy state, and when the start moment of the next busy period arrives, jumping back to the step of determining the current state of the transmission channel at the current moment. By means of the data transmission method and device, it is only when a station needing to perform device-to-device communication and supporting device-to-device communication determines that a transmission channel is in an idle state that the transmission channel can be used to initiate data transmission, so that interference brought about when a station which does not support device-to-device communication performs data transmission can be avoided. Therefore, an access point which is responsible for allocating transmission channels in a communication network can allocate the same transmission channel for the station which supports device-to-device communication and the station which does not support device-to-device communication, thereby realizing undifferentiated reuse of a transmission resource and improving the utilization rate of the transmission resource.

Description

Data transfer method and site that supports device-to-device communication

Technical field

The embodiments of the present invention relate to the field of wireless communications technologies, and in particular, to a data transmission method and a station that supports device-to-device communication.

Background technique

Device-to-device communication is a new technology that allows devices that support device-to-device communication to communicate directly using transmission resources under the control of the system. Specifically, terminal 1 and terminal 2 are sites that support device-to-device communication, and the terminal The distance between the terminal 1 and the terminal 2 is small. When the terminal 1 and the terminal 2 communicate using the transmission resources allocated by the access device (such as the base station), the information sent by the terminal 1 to the terminal 2 can be transferred without going through other transmission nodes. Directly sent to the terminal 2; and device-to-device communication, the terminal performing the transmitting operation can adopt a smaller transmitting power, and the interference caused to other terminals is limited, and the device is also far away from the terminal 1 and the terminal 2 To the terminal 3 and the terminal 4 of the device communication capability, the same transmission resource as the terminal 1 and the terminal 2 can be used when performing device-to-device communication, and the device-to-device communication between the terminal 1 and the terminal 2 and the terminal 3 and The device-to-device communication of the terminal 4 does not interfere with each other, that is, a plurality of different devices that perform device-to-device communication can reuse the same transmission resource. It can solve the shortage of wireless spectrum communication system resources to a certain extent.

In the prior art, an access device divides a dedicated transmission resource among all transmission resources and allocates it to a terminal that needs to perform device-to-device communication, so that other communication and device-to-device communication are not interfered with each other; The dedicated transmission resource can be multiplexed by multiple terminals that perform device-to-device communication; specifically, the access device receives a neighbor list reported by the terminal that can perform device-to-device communication, and the two devices that can perform device-to-device communication are in the same neighbor list. For example, the terminal 1 can perform device-to-device communication with the terminal 2, and the neighbor list reported by the terminal 1 includes the identifier of the terminal 2, and the terminal 3 is far away from the terminal 1, and the terminal 1 cannot discover the terminal 3. Or the terminal 3 does not enable the device-to-device communication function, and the terminal 1 cannot perform device-to-device communication with the terminal 3. Therefore, the neighbor list reported by the terminal 1 does not include the identifier of the terminal 3; when the access device sends the terminal 1 and the terminal 2 After allocating dedicated transmission resources for device-to-device communication, access settings It is known that the terminal 3 requests to perform device-to-device communication with the terminal 4, and the access device learns according to the neighbor list reported by each terminal, and the identifiers of the terminal 3 and the terminal 4 are not located in the neighbor list reported by the terminal 1 or the terminal 2, and the terminal 3 is illustrated. And the terminal 4 is not in the vicinity of the terminal 1 and the terminal 2, the device-to-device communication of the terminal 1 and the terminal 2 does not interfere with the device-to-device communication of the terminal 3 and the terminal 4, and the terminal 1 and the terminal 4 can be allocated with the terminal 1 and The same dedicated transmission resource of the terminal 2 realizes multiplexing of dedicated transmission resources; when the neighbor list reported by the terminal 1 or the terminal 2 has the identifiers of the terminal 3 and the terminal 4, the access device can determine that the terminal 3 and the terminal 4 are at the terminal. 1 and the vicinity of the terminal 2, if the same dedicated transmission resources as the terminal 1 and the terminal 2 are allocated to the terminal 3 and the terminal 4, the device-to-device communication of the terminal 1 and the terminal 2 and the device-to-device communication of the terminal 3 and the terminal 4 will mutually Interference, therefore the access device will assign to Terminal 3 and Terminal 4 a dedicated transmission resource that is different from Terminal 1 and Terminal 2.

However, when the device-to-device communication is performed by using the prior art, it is found that the above-mentioned dedicated transmission resource can only be used by the device-to-device communication terminal, and the terminal that performs other communication except the device-to-device communication cannot use the dedicated transmission resource; It can be said that the access device sacrifices the transmission resources that can be used by the non-supported device to the device communication site, and the device-to-device communication is used for the device-supported device communication site, and the non-support device-to-device communication site is performed. The impact of other communication activities other than device-to-device communication.

Summary of the invention

Embodiments of the present invention provide a data transmission method and a station that supports device-to-device communication, which is used to improve utilization of transmission resources.

In a first aspect, an embodiment of the present invention provides a data transmission method performed by a station supporting device-to-device communication to initiate data transmission on a transport channel, where the transport channel is connected to the device by the support device and at least one Site sharing that does not support device-to-device communication, characterized in that the method comprises:

A. determining a current state of the transport channel at a current moment;

B. Initiating data transmission when the current state is an idle state, where a termination time of the data transmission does not exceed a start time of a next busy period of the transport channel, and the transport channel is in the busy period One of the stations within the communication of the at least one non-supported device to the device is occupied for data transmission;

C. When the current state is a busy state, the start time of the next busy time period arrives. When you jump back to step A.

With reference to the first aspect, in the first implementation, when the current state is idle, the data transmission is initiated. Specifically, when the current state is an idle state, the duration of the idle state exceeds a preset. The data transmission is initiated when the time is long.

With reference to the first aspect, in the second embodiment, before the step A, the method further includes receiving a transmission scheduling notification from the access point, where the access point is recorded in the transmission scheduling notification The transport channel allocated for the station supporting device-to-device communication, and the start time of each busy period of the transport channel.

With reference to the second embodiment of the first aspect, in the third embodiment, the next busy period is a busy period that is not yet reached in the busy period corresponding to the transmission channel, which is closest to the busy period in which the current time is located.

In conjunction with the first aspect, in the fourth embodiment, the determining the current state of the transport channel is specifically determining a current state of the transport channel by performing a device-to-device idle channel assessment.

In a second aspect, an embodiment of the present invention provides a station that supports device-to-device communication, where the support device-to-device communication station shares a transmission channel with at least one non-supported device-to-device communication station, and the support device-to-device communication The sites include:

a determining module, configured to determine a current state of the transport channel at a current time;

a transmitting module, configured to initiate a data transmission when the current state is an idle state, where a termination time of the data transmission does not exceed a start time of a next busy period of the transport channel, where the transport channel is in the One of the stations communicated by the at least one unsupported device to the device during the busy period is occupied for data transmission;

The determining module is further configured to determine, when the current state is a busy state, that the current state of the transport channel is determined at a current time when a start time of the next busy period arrives.

With reference to the first aspect, in the first embodiment, the transmission module is specifically configured to initiate data transmission when the current state is an idle state, when the duration of the idle state exceeds a preset duration.

With reference to the first aspect, in a second implementation, the transmitting module is further configured to receive a transmission scheduling notification from an access point, where the access scheduling notification records that the access point is the supporting device to The transport channel allocated by the station of device communication, and the start time of each busy period of the transport channel.

With reference to the second embodiment of the first aspect, in the third embodiment, the next busy period is The busy time period corresponding to the busy time period in which the current time is located, which has not yet arrived, in the busy period corresponding to the transmission channel.

In conjunction with the first aspect, in the fourth embodiment, the determining module is specifically configured to determine a current state of the transport channel by performing a device-to-device idle channel assessment.

In a third aspect, an embodiment of the present invention provides a station that supports device-to-device communication, where the support device-to-device communication station shares a transmission channel with at least one non-supported device-to-device communication station, and the support device-to-device communication The sites include:

a processor, configured to determine a current state of the transport channel at a current time;

a transmitter, configured to initiate a data transmission when the current state is an idle state, where a termination time of the data transmission does not exceed a start time of a next busy period of the transport channel, where the transport channel is at One of the stations communicated by the at least one unsupported device to the device during the busy period is occupied for data transmission;

The processor is further configured to determine, when the current state is a busy state, that the current state of the transport channel is determined at a current time when a start time of the next busy period arrives.

In combination with the third aspect, in the first embodiment, the transmitter is specifically configured to initiate data transmission when the current state is an idle state, when the duration of the idle state exceeds a preset duration.

With reference to the third aspect, in the second embodiment, the station supporting device-to-device communication further includes a receiver, where the receiver is further configured to receive a transmission scheduling notification from an access point, where the transmission scheduling notification is The transmission channel allocated by the access point to the station supporting device-to-device communication, and the start time of each busy period of the transmission channel are recorded therein.

With reference to the second embodiment of the third aspect, in the third embodiment, the next busy period is a busy period that is not yet reached in the busy period corresponding to the transmission channel, which is closest to the busy period in which the current time is located.

In conjunction with the third aspect, in a fourth implementation, the processor is specifically configured to determine a current state of the transport channel by performing a device-to-device idle channel assessment.

In this embodiment, the device that needs device-to-device communication supports the device-to-device communication. Only when the transmission channel is determined to be in an idle state, the transmission channel is used to initiate data transmission, thereby avoiding the site that is not supported by the device to the device. Interference with data transmission, so the access point responsible for allocating the transmission channel in the communication network can allocate the same transmission channel to the station supporting device-to-device communication and the non-supporting device-to-device communication, and the transmission resource can be realized without difference. Reuse improves the utilization of transmission resources.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a schematic diagram of an application scenario of Embodiment 1 of a data transmission method according to the present invention;

2 is a schematic flowchart of Embodiment 1 of a data transmission method according to the present invention;

3 is a schematic flowchart of Embodiment 2 of a data transmission method according to the present invention;

4 is a schematic flowchart of Embodiment 3 of a data transmission method according to the present invention;

FIG. 5 is a schematic flowchart diagram of Embodiment 4 of a data transmission method according to the present invention;

6 is a schematic structural diagram of Embodiment 1 of a station supporting device-to-device communication according to the present invention;

7 is a schematic structural diagram of Embodiment 2 of a station supporting device-to-device communication according to the present invention;

FIG. 8 is a schematic structural diagram of Embodiment 3 of a station supporting device-to-device communication according to the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a schematic diagram of an application scenario of Embodiment 1 of a data transmission method according to the present invention. As shown in FIG. 1 , the transmission resources in the communication network in this embodiment may be shared by multiple sites; specifically, in the coverage of the access point AP (Access Point), each site is managed by the AP, and the AP is managed. Each of the stations allocates transmission resources for communication, and the two stations that are closer to each other can directly communicate with the transmission resources allocated by the AP without relying on the access node AP, for example, the mobile terminal A1 and the mobile terminal A2 are close to each other. And the mobile terminal A1 and the mobile terminal A2 have device-to-device The function of the communication, that is, the station that supports the device-to-device communication, the mobile terminal A1 and the mobile terminal A2 can use the transmission resource allocated by the AP to perform device-to-device communication; specifically, the mobile terminal A1 has the function of device-to-device communication. And in the vicinity of the mobile terminal A1, there is a mobile terminal A2 having a function of device-to-device communication, and the mobile terminal A1 can discover the mobile terminal A2, and the mobile terminal A1 initiates data transmission as a site supporting device-to-device communication, that is, as a supporting device. The mobile terminal A1 of the station that communicates with the device transmits data to its peer station, that is, the mobile terminal A2, using the resources allocated by the AP, wherein the mobile terminal A1 and the mobile terminal A2 form a transmission pair A, similarly, to form a transmission pair B, Each of the mobile terminals that transmit pair C, transport pair D, transport pair E, and transport pair F are devices that support device-to-device communication; in the AP coverage area, there are non-supported devices in addition to the devices that support device-to-device communication. To the site where the device communicates, the data transmission performed by the non-supported device to the device communication site is specifically to the AP. Sending data, for example, STA1 that sends data to the AP as shown in FIG. 1 is a non-supported device-to-device communication site; the transmission resources occupied by the above-mentioned device-to-device communication site and non-support device-to-device communication site may be used for data transmission. The same or different; in the communication activity, when the AP allocates the transmission resource, specifically allocates the device-to-device communication site and the non-support device-to-device communication site in the form of a transmission channel, and the data transmission method is as follows:

FIG. 2 is a schematic flowchart diagram of Embodiment 1 of a data transmission method according to the present invention. As shown in FIG. 2, the present embodiment is performed by a station supporting device-to-device communication to initiate data transmission on a transport channel, the transport channel being communicated by the support device-to-device communication station and at least one non-supported device-to-device communication The site sharing is applied to the application scenario shown in Figure 1, as follows:

S101. Determine a current state of the transmission channel at the current time.

The current moment is a relative concept. For example, when the device supporting device-to-device communication needs to perform device-to-device communication at the objective time t1, the time t1 is the current time; and as the objective time changes, at time t2, the supporting device When the device to the device communication needs to perform device-to-device communication again, the time t2 is the new current time; specifically, the transmission pair A in FIG. 1 is described, and at the current moment, the mobile device A1 sends data to the mobile device A2, then the mobile device A1 needs to perform a device-to-device communication transmission operation. At this time, the mobile device A1 serves as an execution subject of the embodiment. When the mobile device A2 feeds back information to the mobile device A1, the mobile device A2 also serves as an execution subject of the embodiment.

The above transport channel is supported by the supporting device to the device and at least one non-supported device To the site sharing of the device communication, the time period in which the above-mentioned transmission channel is occupied by at least one non-supported device-to-device communication site for data transmission is a busy period of the transmission channel, and the data transmission performed by the non-supporting device to the device communication site is specific. In order to send data to the AP, the site that supports the device-to-device communication is the mobile terminal A1, and the site that does not support the device-to-device communication is the STA1 and the STA3. At the same time, the STA1 occupies the transmission channel and sends data to the AP. And the mobile terminal A1 also uses the transmission channel to transmit information to the opposite site, that is, the mobile terminal A2; since the location of STA1 and the mobile terminal A1 and the mobile terminal A2 in the transmission pair A are relatively close, STA1 transmits on the transmission channel. The data may interfere with the data that the mobile terminal A2 receives from the mobile terminal A1, that is, the mobile terminal A2 cannot correctly receive the information sent by the mobile terminal A1 because it receives a strong interference signal from the STA1; but for the STA3 in FIG. Because STA3 is far away from the location of the mobile terminal A1 and the mobile terminal A2 in the transmission pair A, even if STA3 is used at the same time. The transmission channel sends data to the AP, and does not cause interference to the mobile terminal A2; since any station supporting the device communication in the communication network is not aware of the geographical location of other non-supported device-to-device communication sites, the device-to-device is supported. In order to enable the peer station in the transmission center to correctly receive data, the station needs to determine the current state of the transmission channel before transmitting the data; if the current state is in the idle state, it indicates that the station supporting the device to communicate with the device is shared. The non-supported device-to-device communication site of the transport channel is far away from the site where the support device communicates with the device. The non-support device-to-device communication site transmits data on the transport channel without affecting the pair of devices supporting device-to-device communication. The end station receives data sent by the station supporting device-to-device communication; if the current status is busy, indicating that the non-supported device-to-device communication station sharing the transmission channel with the device that supports the device-to-device communication and the supporting device-to-device Communication site distance is relatively close, non-supported device to device communication The station transmits data in the transmission channel affect the support devices to the peer device communication station receiving station apparatus to support data transmission device communication station.

S102: Initiate data transmission when the current state is an idle state.

If the station supporting the device-to-device communication determines that the transmission channel is in an idle state, that is, when the transmission channel is determined to use the transmission channel to transmit data to the opposite site, the opposite site can successfully receive data without being occupied by at least one of the transmission channels at the current time. Interference from a device that does not support device-to-device communication, that is, at a current moment, a station that supports device-to-device communication can use the transmission channel to transmit data to the opposite site, and then support the device-to-device communication to the pair in the transmission pair The end station initiates a data transfer.

S103. When the current state is the busy state, when the start time of the next busy period arrives, the process returns to S101.

If the device supporting the device-to-device communication determines that the transmission channel is in a busy state, that is, when the transmission channel is determined to use the transmission channel to send data to the opposite site, the receiving operation of the opposite site is affected by at least one non-supporting device occupying the transmission channel at the current time. The interference from the station communicating with the device cannot successfully receive the data sent by the station supporting the device-to-device communication, that is, at the current moment, the station supporting the device-to-device communication cannot use the transmission channel to send data to the opposite site; The station to the device communication needs to be at the start time of the next busy hour, that is, at the start time of the objective busy time to the next busy time, the starting time of the next busy time is taken as the new current time, and the support is supported. The device-to-device communication site again determines at a new current time whether the transport channel can be used to send data to the correspondent site.

For example, the transport channel is allocated by the AP to the mobile terminal A1 and the mobile terminal A2 as stations supporting device-to-device communication, and also to STA1 and STA3 as sites of non-supported device-to-device communication, specifically, T1 time It is the starting time of STA1 occupying the transmission channel, that is, the starting time of a busy period of the transmission channel, and the time T2 is the starting time of STA3 occupying the transmission channel, and also the start of the next busy period of the transmission channel. At the moment, the mobile terminal A1 needs to send data to the mobile terminal A2 at the current time (T1 time or after the T1 time and before the T2 time), and then S101 is performed to determine the current state of the transport channel; since the STA1 and the transmission pair A distance If the current state of the mobile terminal A1 is determined to be in a busy state, the S1 is performed in the S101, and the S10 is performed as the objective time passes. When the start time of the busy hour comes, that is, at time T2, the time T2 is taken as the new current time, and the T2 time corresponding to the new current time is determined. The current state of the transmission channel, because the transmission distance of A farther STA3, STA3 not receive data transmitted from the mobile terminal A1 to the mobile terminal A2 cause interference, the step S102 is performed, i.e., data transfer initiated directly.

In addition, in S102, the termination time of the data transmission does not exceed the start time of the next busy period of the transport channel, and one of the stations that the communication channel is communicated by the at least one non-supported device to the device during the busy period Occupied for data transmission, it may be that the next busy period is occupied by the non-supported device to the device communication site that is closer to the device supporting the device communication, so the termination time of one data transmission of the device supporting the device to device communication is not Exceeding the transmission channel a starting time of the next busy time period; the next busy time period is a busy time period that is not yet reached in the busy time period corresponding to the transmission channel, which is closest to the busy time period in which the current time is located.

FIG. 3 is a schematic flowchart diagram of Embodiment 2 of a data transmission method according to the present invention. As shown in FIG. 3, this embodiment is further described on the basis of the embodiment shown in FIG. 2, and specifically includes:

S201. Discover a neighbor site that can perform device-to-device communication, and generate a neighbor list.

For example, if there is a mobile terminal A2, a mobile terminal C1, and a mobile terminal C2 having a function of device-to-device communication in the vicinity of the mobile terminal A1 in the communication network, the mobile terminal A1 can discover the mobile terminal A2, the mobile terminal C1, and the mobile terminal C2, and The mobile terminal A1, the mobile terminal A2, the mobile terminal C1, and the mobile terminal C2 are mutually neighbor sites;

Any device that supports device-to-device communication capability from a device-to-device communication site discovers a neighboring site with device-to-device communication capabilities, and generates a neighbor list. The neighbor list contains the identifiers of the neighboring sites that have device-to-device communication capabilities. The link quality of device-to-device communication between the device-to-device communication site and each neighbor site.

S202. Send a neighbor list to the AP.

S203. Receive a transmission scheduling notification sent by the AP.

The transmission scheduling notification records the transmission channel allocated by the AP for the station supporting the device to communicate with the device, and the starting time of each busy period of the transmission channel.

Specifically, the station supporting the device-to-device communication may read the resource indication information for the station supporting the device-to-device communication from the downlink broadcast packet sent by the AP, thereby determining the transmission channel allocated by the AP to the device supporting the device-to-device communication. At the same time, the starting time of each busy period of the transmission channel is also known.

The foregoing transport channel is allocated by the AP to a station supporting device-to-device communication for device-to-device communication; and is also allocated by the AP to a non-supported device-to-device communication site for the non-supported device-to-device communication site to send to the AP Data; for example, within the coverage of the AP, access STA1, STA2, and STA3, STA1, STA2, and STA3 all request allocation of transmission resources for transmitting data to the AP, and the AP allocates corresponding transmission channels for STA1, STA2, and STA3 according to the requests of STA1, STA2, and STA3; After the AP allocates the corresponding transport channel for STA1, STA2, and STA3, when the station supporting the device-to-device communication also requests the AP to allocate the transmission resource for device-to-device communication, the AP allocates the above to the non-supported device to the device. At least part of the transport channel in the transport channel of the communicating station is allocated to the station supporting device-to-device communication; Table 1 below is used to illustrate the transport channel allocated by the AP:

Table 1

设备标识Equipment Identity	信道分配指示Channel assignment indication
设备标识Equipment Identity	信道分配指示Channel assignment indication	STA1STA1	{1,2}{1,2}
STA2STA2	{3}{3}	STA1STA1	{1,2}{1,2}
STA2STA2	{3}{3}	STA3STA3	{4}{4}
传输对A：A1、A2Transmission pair A: A1, A2	{1,2}{1,2}	STA3STA3	{4}{4}
传输对A：A1、A2Transmission pair A: A1, A2	{1,2}{1,2}	传输对B：B1、B2Transfer pair B: B1, B2	{1,2,3,4}{1,2,3,4}
传输对C：C1、C2Transmission pair C: C1, C2	{3,4}{3,4}	传输对B：B1、B2Transfer pair B: B1, B2	{1,2,3,4}{1,2,3,4}
传输对C：C1、C2Transmission pair C: C1, C2	{3,4}{3,4}	传输对D：D1、D2Transfer pair D: D1, D2	{1,2}{1,2}
传输对E:E1、E2Transmission pair E: E1, E2	{3}{3}	传输对D：D1、D2Transfer pair D: D1, D2	{1,2}{1,2}
传输对E:E1、E2Transmission pair E: E1, E2	{3}{3}	传输对F：F1、F2Transfer pair F:F1, F2	{4}{4}

With reference to FIG. 1 and Table 1, for sites that do not support device-to-device communication (ie, STA1, STA2, and STA3), the AP allocates transmission channels 1 to 4 to STA1, STA2, and STA3, respectively; and at the same time, the AP receives according to S202. The neighbor list shows that the transmission pair A and the transmission pair C are relatively close, and the transmission channel allocated to the transmission pair A and the transmission channel allocated to the transmission pair C are completely different, but the transmission pair A and the transmission pair B are far apart, and then the allocation is performed. The transport channel to the transport pair A can also be assigned to the transport pair C; the AP does not know the distance between the non-supported device-to-device communication site and the support device-to-device communication site, but the device-to-device communication in this embodiment The station may initiate data transmission when determining that the receiving operation of the opposite site is not affected by the non-supported device-to-device communication site, so the AP allocates a transport channel for the non-supported device-to-device communication site. It can also be assigned to sites that support device-to-device communication.

However, it should be noted that the foregoing transport channel is only used by the site that supports device-to-device communication during the period in which the non-supported device-to-device communication transmits data to the AP, because the non-supported device communicates with the device. The site uses the AP to communicate with each device from the non-supported device. In the process of transmitting data to the AP, the AP acts as the only receiving end, and the AP has the function of avoiding interference from device to device communication. The sending operation is also not interfered by the surrounding support device-to-device communication station; and the non-supported device-to-device communication station receives the data sent by the AP through the transport channel allocated by the AP for each non-supported device-to-device communication station. In the process, if each of the supporting device-to-device communication site multiplexing APs allocates a transmission channel allocated by each non-supporting device to the device communication station, the non-supporting device-to-device communication site that receives the data sent by the AP is subjected to the surrounding The interference of the data transmission performed by the device that supports the device-to-device communication cannot correctly receive the data sent by the AP; therefore, in the embodiment, the foregoing transmission channel only transmits the data to the AP when the non-supported device-to-device communication station sends data to the AP. The site can be multiplexed by the device-to-device communication, so in S203, the transmission The transmission notification channel records the transmission channel allocated by the AP for the device supporting device-to-device communication, and the start time of each busy period of the transmission channel, where the busy period is a site usage of non-supported device-to-device communication The period of time that the transport channel uses to send data to the AP.

It should be additionally noted that a transmission pair needs to perform the foregoing S201 to S203 when performing device-to-device communication for the first time; and then, the station that transmits the two supporting devices to the device communication in the pair is in the process of device-to-device communication, The foregoing S201 to S203 are not executed.

S204. Determine the current state of the transport channel by performing a device-to-device idle channel assessment at the current moment.

The device supporting device-to-device communication adopts Clear Channel Assessment (CCA), performs energy detection on the transmission channel, and determines the current state of the transmission channel according to the energy detection result;

Specifically, a site that has defined non-supported device-to-device communication causes effective interference to a device-to-device communication site (Non-AP-STA-to-Non-AP-STA Interference Area, NIA). That is, when STA1 transmits data to the AP by occupying the transmission channel 1 and the transmission channel 2, if a mobile terminal is in the NIA of STA1 (as shown in FIG. 1, the transmission pair A and the transmission pair B are located in a solid circle, The area enclosed by the solid circle is the NIA of STA1. At this time, the mobile terminal A1 also uses the transmission channel 1 and the transmission channel 2 to transmit data to the mobile terminal A2, and the mobile terminal A2 is interfered by the STA1 and cannot receive the data correctly. Therefore, the device supporting device-to-device communication in this embodiment When performing S204, the Clear Channel Assessment (CCA) is used to perform energy detection on the transmission channel to determine whether the energy detection result is greater than the NIA Detection Threshold (NIA-DT). And determining that the current state of the transport channel is a busy state; if not, determining that the current state of the transport channel is an idle state.

S205. If the current state is an idle state, initiate data transmission when determining that the duration of the idle state exceeds a preset duration.

The preset duration should not exceed the most basic one symbol length specified in the system, for example, half OFDMA (Orthogonal Frequency Division Multiple Access) symbol length.

It should be noted that, in order to avoid the judgment error of the foregoing S204, the device-to-device idle channel evaluation is repeatedly performed within a preset time, and the data transmission is initiated only when it is determined that the duration of the idle state exceeds the preset duration.

S206. If the current state is a busy state, when the start time of the next busy time period arrives, the process returns to S204.

Specifically, in the device-to-device communication, the station that supports the device as the transmitting end to the device communicates with the peer station that is the receiving end, so that the transmitting end does not need to use a large power, so that the opposite end station can accurately receive the data. In this embodiment, the device-to-device communication is further prevented from causing interference to other communications except the device-to-device communication (such as the non-supported device-to-device communication site sending data to the AP). The foregoing device supporting device-to-device communication transmits data to the opposite site by using preset transmit power; the preset transmit power is smaller than the transmit power of the site where the non-supported device communicates with the device.

Further, in the device-to-device communication process, the data that the device-to-device communication station sends to the opposite site is specifically M consecutive data frames (M is a positive integer greater than 1), according to different sending mechanisms. The sending operation performed by the station supporting the device-to-device communication is used to send one or at least two data frames; specifically, the station supporting the device-to-device communication performs only the N data frames in the above data when executing S205 (N is not A positive integer greater than M); when N is not equal to M, the station that supports device-to-device communication needs to perform multiple transmission operations before data transmission can be completed, and then the transmission channel needs to be determined before performing each transmission operation. The current state is idle or busy.

In this embodiment, the device that needs to perform device-to-device communication to support device communication only uses the transmission channel to initiate data transmission only when it is determined that the transmission channel is in an idle state. To avoid interference from data transmission from sites that are not supported by the device to the device, the access point responsible for allocating the transport channel in the communication network can assign the same to the site that supports device-to-device communication and the site where the non-supported device communicates with the device. The transmission channel can realize the non-differential multiplexing of transmission resources and improve the utilization of transmission resources.

FIG. 4 is a schematic flowchart diagram of Embodiment 3 of a data transmission method according to the present invention. As shown in FIG. 4, this embodiment is an optional implementation manner based on the embodiment shown in FIG. 2, and specifically includes:

S301. Discover a neighbor site that can perform device-to-device communication, and generate a neighbor list.

S302. Send a neighbor list to the AP.

S303. Receive a transmission scheduling notification sent by the AP.

The foregoing S301-S303 are similar to the above-mentioned S201-S203. Similarly, in this embodiment, a transmission pair needs to perform the foregoing S301-S303 when performing device-to-device communication for the first time; then, the two supporting devices to the device communication are transmitted. The S301 to S303 may not be executed in the process of device-to-device communication.

S304. Perform a data transmission using the transport channel and determine that the correct response is not received.

Considering that in practical applications, it is possible that there is no non-supported device-to-device communication site around the transmission pair formed by the site supporting device-to-device communication, so in order to reduce the load of the judgment operation of the site supporting the device-to-device communication, Alternatively, the station supporting device-to-device communication can directly use the transmission channel to initiate data transmission to the opposite site, that is, the station supporting the device-to-device communication does not need to determine whether the transmission channel is idle before performing the transmission operation ( That is, it is judged whether the transmission channel is available. However, after the device that supports the device-to-device communication performs the sending operation, if the feedback information of the opposite site is not correctly received multiple times (for example, 5 times), the feedback information may be an acknowledgement (ACK), that is, Sites that support device-to-device communication determine that the correct response has not been received, indicating that the site that supports device-to-device communication and the peer site may be in the NIA of a site that is not supported device-to-device communication, and the current data transfer needs to be stopped, immediately Execute S305.

It can be understood that if the device supporting the device-to-device communication performs the sending operation and receives the ACK of the opposite site, it indicates that the data is transmitted to the opposite site by using the transmission channel at the current moment, and the peer station can receive the data correctly without being affected. ; can continue to transfer data.

S305. Determine the current state of the transport channel by performing device-to-device idle channel estimation at the current moment.

S306. If the current state is an idle state, initiate data transmission when determining that the duration of the idle state exceeds a preset duration.

S307. If the current state is the busy state, when the start time of the next busy period comes, the process returns to step S305.

In this embodiment, the device that needs device-to-device communication supports the device-to-device communication. Only when the transmission channel is determined to be in an idle state, the transmission channel is used to initiate data transmission, thereby avoiding the site that is not supported by the device to the device. Interference with data transmission, so the access point responsible for allocating the transmission channel in the communication network can allocate the same transmission channel to the station supporting device-to-device communication and the non-supporting device-to-device communication, and realize the indiscriminate complex transmission resource. Use, improve the utilization of transmission resources.

FIG. 5 is a schematic flowchart diagram of Embodiment 4 of a data transmission method according to the present invention. As shown in FIG. 4, this embodiment is an optional implementation manner based on the embodiment shown in FIG. 2, and specifically includes:

S401. Discover a neighbor site that can perform device-to-device communication, and generate a neighbor list.

S402. Send a neighbor list to the AP.

S403. Receive a transmission scheduling notification sent by the AP.

The above S401 to S403 are similar to the foregoing S201 to S203. Similarly, in this embodiment, a transmission pair needs to perform the foregoing S401 to S403 when performing device-to-device communication for the first time; then, the two supporting devices to the device communication are transmitted. The S401 to S403 may not be executed in the process of device-to-device communication.

S404. Determine whether the number of times of initiating data transmission is 0 by using the transport channel; if yes, execute S405; if not, execute S408.

Considering that in practical applications, possible, resource competition is not intense, when a station supporting device-to-device communication determines that the transport channel is idle (ie, the transport channel is available), even if the site supporting device-to-device communication needs to be directed to the opposite site The data is sent multiple times, but when the data is first sent to the opposite site for the first time, it is determined that the transmission channel is in an idle state, and it can be predicted that the transmission channel remains idle for a long period of time, and then each time to the opposite site is initiated. When data transmission is performed, it is not necessary to determine whether the transmission channel is in an idle state, and S408 can be directly executed.

S405. Determine the current state of the transport channel by performing a device-to-device idle channel assessment at the current time.

S406. If the current state is a busy state, when the start time of the next busy time period arrives, The process returns to step S405.

S407. If the current state is an idle state, determine that the duration of the idle state exceeds a preset duration.

S408. Initiate data transmission.

FIG. 6 is a schematic structural diagram of Embodiment 1 of a station supporting device-to-device communication according to the present invention. As shown in FIG. 6, the station supporting device-to-device communication shares a transmission channel with at least one non-supported device-to-device communication station, and the device includes:

a determining module 51, configured to determine a current state of the transport channel at a current time;

The transmitting module 52 is configured to initiate data transmission when the current state is an idle state, where a termination time of the data transmission does not exceed a start time of a next busy period of the transport channel, where the transport channel is One of the stations communicated by the at least one non-supported device to the device during the busy period is used for data transmission;

The determining module 51 is further configured to determine, when the current state is a busy state, that the current state of the transport channel is determined at the current moment when a start time of the next busy period arrives.

Further, the transmission module 52 is specifically configured to initiate data transmission when the current state is an idle state, when the duration of the idle state exceeds a preset duration.

The transmission module 52 is further configured to receive a transmission scheduling notification from the access point, where the transmission scheduling notification records the transmission channel allocated by the access point to the station supporting the device to communicate with the device, And a start time of each busy period of the transmission channel.

Further, the next busy period is a busy period that is not yet reached in the busy period corresponding to the transmission channel, which is closest to the busy period in which the current time is located.

Further, the determining module 51 is specifically configured to determine a current state of the transport channel by performing a device-to-device idle channel assessment.

In this embodiment, the device-to-device communication support device-to-device communication site is only required. When the transmission channel is determined to be in an idle state, the transmission channel is used to initiate data transmission, thereby avoiding interference of data transmission by a site that is not supported by the device to the device, and therefore the access point responsible for allocating the transmission channel in the communication network. The same transport channel can be allocated to the site that supports device-to-device communication and the site where the non-supported device communicates with the device, which realizes the indiscriminate multiplexing of transmission resources and improves the utilization of transmission resources.

FIG. 7 is a schematic structural diagram of Embodiment 2 of a station supporting device-to-device communication according to the present invention. As shown in FIG. 7, the station supporting device-to-device communication shares a transmission channel with at least one non-supported device-to-device communication station, and the device includes:

The processor 61 is configured to determine a current state of the transport channel at a current time;

The transmitter 62 is configured to initiate data transmission when the current state is an idle state, where a termination time of the data transmission does not exceed a start time of a next busy period of the transport channel, where the transport channel is One of the stations communicated by the at least one non-supported device to the device during the busy period is used for data transmission;

The processor 61 is further configured to determine, when the current state is a busy state, that the current state of the transport channel is determined at a current time when a start time of the next busy period arrives.

FIG. 8 is a schematic structural diagram of Embodiment 3 of a station supporting device-to-device communication according to the present invention. As shown in FIG. 8, the embodiment is further described on the basis of the embodiment shown in FIG. 7. Specifically, the transmitter 62 is specifically configured to: when the current state is an idle state, The data transmission is initiated when the duration of the idle state exceeds the preset duration.

Further, the device further includes a receiver 63, configured to receive a transmission scheduling notification from the access point, where the transmission scheduling notification records that the access point is allocated to the station that supports device-to-device communication. The transport channel, and a start time of each busy period of the transport channel.

Further, the next busy period is the distance between the busy periods corresponding to the transmission channel, and the distance The most recent rush hour that has not yet arrived during the busy hour of the current time.

Further, the processor 61 is specifically configured to determine a current state of the transport channel by performing a device-to-device idle channel assessment.

It should be noted that each module in the foregoing embodiments of the device that supports device-to-device communication corresponds to each step in the foregoing various method embodiments. For specific implementation details and technical effects, refer to various method embodiments.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to the program instructions. The foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

A data transmission method performed by a station supporting device-to-device communication to initiate data transmission on a transport channel shared by the support device-to-device communication site with at least one non-device-to-device communication site , characterized in that the method comprises:

A. determining a current state of the transport channel at a current moment;

B. Initiating data transmission when the current state is an idle state, where a termination time of the data transmission does not exceed a start time of a next busy period of the transport channel, and the transport channel is in the busy period One of the stations within the communication of the at least one non-supported device to the device is occupied for data transmission;

C. When the current state is the busy state, when the start time of the next busy period comes, the process returns to step A.
The method according to claim 1, wherein the data transmission is initiated when the current state is idle, and specifically, when the current state is an idle state, the duration of the idle state exceeds a pre- The data transmission is initiated when the duration is set.
The method of claim 1, wherein prior to said step A, the method further comprises receiving a transmission scheduling notification from the access point, wherein the access is recorded in the transmission scheduling notification The point is the transport channel allocated by the device-to-device communication station, and the start time of each busy period of the transport channel.
The method according to claim 3, wherein the next busy period is a busy period that is not yet reached in the busy period corresponding to the transmission channel, which is closest to the busy period in which the current time is located.
The method of claim 1, wherein the determining the current state of the transport channel is specifically determining a current state of the transport channel by performing a device-to-device idle channel assessment.
A station supporting device-to-device communication, wherein the station supporting the device to communicate with the device shares a transmission channel with the at least one non-supported device-to-device communication station, and the supporting device-to-device communication site includes:

a determining module, configured to determine a current state of the transport channel at a current time;

a transmitting module, configured to initiate data transmission when the current state is an idle state, where a termination time of the data transmission does not exceed a start time of a next busy period of the transport channel, The transport channel is occupied by one of the at least one non-supported device-to-device communication site during the busy period for data transmission;

The determining module is further configured to determine, when the current state is a busy state, that the current state of the transport channel is determined at a current time when a start time of the next busy period arrives.
The device for supporting device-to-device communication according to claim 6, wherein the transmission module is specifically configured to: when the current state is an idle state, initiate data when the duration of the idle state exceeds a preset duration transmission.
The device for supporting device-to-device communication according to claim 6, wherein the transmission module is further configured to receive a transmission scheduling notification from an access point, wherein the access is recorded in the transmission scheduling notification. The point is the transport channel allocated by the station supporting device-to-device communication, and the start time of each busy period of the transport channel.
The station supporting device-to-device communication according to claim 8, wherein the next busy period is a busy period of the busy period corresponding to the transport channel, which is closest to the busy period in which the current time is located. .
The station supporting device-to-device communication according to claim 9, wherein the determining module is specifically configured to determine a current state of the transport channel by performing a device-to-device idle channel assessment.
A station supporting device-to-device communication, wherein the station supporting the device to communicate with the device shares a transmission channel with the at least one non-supported device-to-device communication station, and the supporting device-to-device communication site includes:

a processor, configured to determine a current state of the transport channel at a current time;

a transmitter, configured to initiate a data transmission when the current state is an idle state, where a termination time of the data transmission does not exceed a start time of a next busy period of the transport channel, where the transport channel is at One of the stations communicated by the at least one unsupported device to the device during the busy period is occupied for data transmission;

The processor is further configured to determine, when the current state is a busy state, that the current state of the transport channel is determined at a current time when a start time of the next busy period arrives.
The device for supporting device-to-device communication according to claim 11, wherein the transmitter is specifically configured to: when the current state is an idle state, initiate data when the duration of the idle state exceeds a preset duration transmission.
The device supporting device-to-device communication according to claim 11, wherein the station supporting device-to-device communication further comprises a receiver, wherein the receiver is further configured to receive a transmission scheduling notification from the access point, The transmission scheduling notification records the transmission channel allocated by the access point to the station supporting the device to communicate with the device, and the starting time of each busy period of the transmission channel.
The station for supporting device-to-device communication according to claim 13, wherein the next busy period is a busy period of the busy period corresponding to the transmission channel, which is closest to the busy period in which the current time is located. .
The station supporting device-to-device communication according to claim 14, wherein the processor is specifically configured to determine a current state of the transport channel by performing a device-to-device idle channel assessment.