CN110958682A

CN110958682A - Method and device for point-to-point physical layer communication in ad hoc network, sending UE (user equipment) and receiving UE

Info

Publication number: CN110958682A
Application number: CN201911203354.5A
Authority: CN
Inventors: 董宇; 刘文明; 冷欣
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-04-03
Anticipated expiration: 2039-11-29
Also published as: CN110958682B

Abstract

A method, a device, a sending UE and a receiving UE for point-to-point physical layer communication in an ad hoc network are provided, wherein the method comprises the following steps: sending a synchronous signal frame carrying beacon indication information, wherein the synchronous signal frame is used for realizing time domain and frequency domain synchronization of both communication parties; sending a beacon frame according to the beacon indication information, wherein the beacon frame is used for indicating the sending information of the data frame; transmitting the data frame according to the transmission information; wherein the synchronization signal frame, the beacon frame and the data frame are contained in the same superframe of the ad hoc network communication. By the method, the transmission efficiency of effective data can be improved, and self-adaptive adjustment can be flexibly carried out according to the communication condition of the ad hoc network.

Description

Method and device for point-to-point physical layer communication in ad hoc network, sending UE (user equipment) and receiving UE

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for peer-to-peer physical layer communication in an ad hoc network, a sending UE, and a receiving UE.

Background

Compared with a common wireless network combining a base station and a terminal, the ad hoc network has no central scheduling unit of wireless resources, so that each node in the ad hoc network plays the role of the base station and is also the terminal, generally fixed frequency resources and error correction codes and modulation modes are used, and the sharing of the wireless resources among different nodes is realized by a time division method.

For the networking mode, ad hoc network point-to-point communication generally adopts a superframe structure and a frame structure of an Institute of Electrical and Electronics Engineers (IEEE for short) 802.15.4 protocol, as shown in fig. 1, fig. 1 provides a superframe structure schematic diagram of an ad hoc network in the prior art; the beacon frame of the superframe indicates a Contention Access Period (CAP for short), a duration of a non-Contention Access Period (CFP for short), an address and time of a sender and a receiver in the CAP, and the like within the superframe time.

As shown in fig. 2, fig. 2 provides a schematic diagram of the structure of each frame in a superframe in the prior art; including the MAC sublayer 201 and the Physical layer 202, time Synchronization is achieved using a Synchronization Header (SHR), and a length of a Presentation Service Data Unit (PSDU) is indicated using a Physical Header (PHR). However, in this way, each frame in the superframe needs to transmit the SHR synchronization header, which reduces the effective data transmission efficiency, and only PHY indicates the PSDU length, and at the same time, the time and frequency domain resource scheduling and modulation modes are fixed, which cannot perform adaptive adjustment according to the radio link loss and intra-network interference condition of the current service.

Disclosure of Invention

The technical problem to be solved by the application is how to provide a point-to-point communication method in an ad hoc network, so that the transmission efficiency of effective data is improved, and self-adaptive adjustment can be flexibly performed according to the communication condition of the ad hoc network.

In order to solve the foregoing technical problem, an embodiment of the present application provides a peer-to-peer communication method in an ad hoc network, where the method includes: sending a synchronous signal frame carrying beacon indication information, wherein the synchronous signal frame is used for realizing time domain and frequency domain synchronization of both communication parties; sending a beacon frame according to the beacon indication information, wherein the beacon frame is used for indicating the sending information of the data frame; transmitting the data frame according to the transmission information; wherein the synchronization signal frame, the beacon frame and the data frame are contained in the same superframe of the ad hoc network communication.

Optionally, the synchronization signal frame includes a primary synchronization signal frame and a secondary synchronization signal frame; the main synchronization signal frame is used for realizing the initial synchronization of both communication parties; and the auxiliary synchronization signal frame is used for realizing the accurate synchronization of both communication parties.

Optionally, the duration of the superframe includes a contention access period and a non-contention access period, and the beacon frame includes one or more of the following: attribute information of a contention access period and a non-contention access period in the duration of the superframe, beacon frame confirmation requirement information, and data frame confirmation requirement information.

Optionally, after sending the beacon frame according to the beacon indication information, before sending the data frame according to the sending information, the method further includes: and when the beacon frame confirmation requirement information represents that the beacon frame needs to be confirmed, receiving a beacon reply frame corresponding to the beacon frame.

Optionally, after the sending the data frame according to the sending information, the method further includes: and when the data frame confirmation requirement information represents that the data frame needs to be confirmed, receiving a data reply frame corresponding to the data frame.

Optionally, the data frame is sent in the contention access period, and the data reply frame is received in the non-contention access period.

Optionally, in the ad hoc network communication superframe, the synchronization signal frame and the beacon frame use the same carrier frequency.

Optionally, the method further includes: and sending a reverse frame, wherein the reverse frame comprises a synchronization head and a data frame, and the synchronization head is used for realizing the synchronization of both communication parties.

The embodiment of the present application further provides a peer-to-peer communication method in an ad hoc network, where the method includes: receiving a synchronous signal frame sent by sending UE, and carrying out time-frequency domain synchronization with the sending UE according to the synchronous signal frame, wherein the synchronous signal frame carries beacon indication information; receiving a beacon frame corresponding to the beacon indication information, wherein the beacon frame is used for indicating the sending information of a data frame; receiving a data frame corresponding to the sending information of the data frame; wherein the synchronization signal frame, the beacon frame and the data frame are contained in the same superframe of the ad hoc network communication.

Optionally, after receiving the beacon frame indicated by the synchronization signal frame, the method further includes: and generating a beacon reply frame according to the beacon frame, and sending the beacon reply frame.

Optionally, after receiving the data frame corresponding to the sending information of the data frame, the method further includes: and generating a data recovery frame according to the data frame, and sending the data recovery frame.

An embodiment of the present application provides a peer-to-peer physical layer communication device in an ad hoc network, where the device includes: a synchronous signal frame sending module, configured to send a synchronous signal frame carrying beacon indication information, where the synchronous signal frame is used to implement time-domain and frequency-domain synchronization between two communication parties; a beacon frame sending module, configured to send a beacon frame according to the beacon indication information, where the beacon frame is used to indicate sending information of a data frame; a data frame sending module, configured to send the data frame according to the sending information; wherein the synchronization signal frame, the beacon frame and the data frame are contained in the same superframe of the ad hoc network communication.

An embodiment of the present application provides a peer-to-peer physical layer communication device in an ad hoc network, where the device includes: a synchronization signal frame receiving module, configured to receive a synchronization signal frame sent by a sending UE, and perform time-domain and frequency-domain synchronization with the sending UE according to the synchronization signal frame, where the synchronization signal frame carries beacon indication information; a beacon frame receiving module, configured to receive a beacon frame corresponding to the beacon indication information, where the beacon frame is used to indicate sending information of a data frame; the data frame receiving module is used for receiving a data frame corresponding to the sending information of the data frame; wherein the synchronization signal frame, the beacon frame and the data frame are contained in the same superframe of the ad hoc network communication.

An embodiment of the present application provides a sending UE, including a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the computer instructions to perform any one of the steps of the method described above.

An embodiment of the present application provides a receiving UE, including a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the computer instructions to perform any one of the steps of the method described above.

Compared with the prior art, the technical scheme of the embodiment of the application has the following beneficial effects:

the embodiment of the application provides a point-to-point communication method in an ad hoc network, which comprises the following steps: sending a synchronous signal frame carrying beacon indication information, wherein the synchronous signal frame is used for realizing time domain and frequency domain synchronization of both communication parties; sending a beacon frame according to the beacon indication information, wherein the beacon frame is used for indicating the sending information of the data frame; transmitting the data frame according to the transmission information; wherein the synchronization signal frame, the beacon frame and the data frame are contained in the same superframe of the ad hoc network communication. Compared with the prior art, in the method of the scheme, the synchronous signal frames carrying the beacon indication information are transmitted only in the first frames in the superframe so as to realize the time-frequency domain synchronization of both communication parties in the superframe, and the synchronous heads do not need to be transmitted in each frame in the superframe, so that the transmission efficiency of effective data can be obviously improved.

Further, the synchronization signal frame may further include a primary synchronization signal frame and a secondary synchronization signal frame, which carry different synchronization information, respectively, and thereby, initial synchronization and precise synchronization of both communication parties are respectively achieved.

Furthermore, in the communication superframe of the ad hoc network, after the sending UE sends the beacon frame, the receiving UE may be instructed to return the corresponding beacon reply frame according to the beacon frame confirmation requirement information included in the beacon frame to determine whether the rest of the superframe is sent, thereby ensuring effective transmission of data in superframe communication; in addition, invalid data transmission can be judged in time according to the beacon reply frame, corresponding resources are released, and effective utilization of channel resources in the ad hoc network is guaranteed.

Furthermore, in the communication superframe of the ad hoc network, whether the data frame in the superframe needs to receive the data recovery frame returned by the UE or not can be indicated in the beacon frame, after the data frame is sent by the UE, whether the transmission of the transmission data is successful or not can be judged according to whether the data recovery frame to be transmitted is received or not, and if the transmission is not successful, the data retransmission can be arranged, so that the accuracy of data transmission is improved, and the flexibility of both communication parties is improved.

Drawings

Fig. 1 is a schematic diagram of a superframe structure of an ad hoc network in the prior art;

FIG. 2 is a diagram illustrating the structure of each frame in a superframe according to the prior art;

fig. 3 is a flowchart illustrating a peer-to-peer communication method in an ad hoc network according to an embodiment of the present application;

FIG. 4 is a diagram illustrating a data frame structure according to an exemplary embodiment of the present application;

FIG. 5 is a diagram illustrating a structure of a beacon reply frame in an exemplary application of the present application;

FIG. 6 is a block diagram illustrating a data recovery frame according to an exemplary application of the present invention;

fig. 7 is a schematic structural diagram of a beacon frame for peer-to-peer communication in an ad hoc network according to an application example of the present application;

fig. 8 is a schematic structural diagram of a frame control field of a beacon frame in an application example of the present application;

FIG. 9 is a block diagram of a superframe according to an embodiment of the present application;

FIG. 10 is a diagram illustrating a structure of a reverse frame according to an embodiment of the present application;

FIG. 11 is a block diagram of a superframe according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a peer-to-peer physical layer communication device in an ad hoc network according to an embodiment of the present application;

fig. 13 is a flowchart illustrating a peer-to-peer communication method in an ad hoc network according to another embodiment of the present application;

fig. 14 is a schematic structural diagram of a peer-to-peer physical layer communication device in an ad hoc network according to another embodiment of the present application.

Detailed Description

As mentioned in the background, the SHR sync header is transmitted every frame in the superframe in the prior art, which reduces the effective data transmission efficiency.

Compared with the prior art, the technical scheme of the application is adopted, the synchronous signal frame carrying the beacon indication information is transmitted only at the beginning in the superframe so as to realize the time-frequency domain synchronization of both communication parties in the superframe, an SHR synchronous head does not need to be transmitted in each frame in the superframe, and the transmission efficiency of effective data can be obviously improved.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings.

In the ad hoc Network system, a Personal Area Network (PAN) coordinator, one or more relay nodes and one or more terminal nodes of each relay node may be included, and the number of PAN coordinators is usually one but not limited thereto. The PAN coordinator is used for maintaining information of all nodes in the ad hoc network system and managing communication relations among all nodes in the ad hoc network. Each relay node and the terminal nodes thereof form a group of communication routes, and the terminal nodes of the relay nodes can communicate with each other through the relay nodes; each relay node can directly or indirectly communicate with the PAN coordinator through other relay nodes to acquire the routing information of the other relay nodes, and terminal nodes belonging to different relay nodes communicate through the different relay nodes. The relay nodes can comprise a primary relay node directly connected with the PAN coordinator, a secondary relay node … connected with the primary relay node, and an n-level relay node connected with the n-1 level relay node, and the terminal node can be directly connected with the PAN coordinator or can be connected with the primary relay node or any other relay node according to the needs.

Please refer to fig. 3, in which fig. 3 provides a flowchart illustrating a peer-to-peer communication method in an ad hoc network according to an embodiment of the present application; one superframe of the ad hoc network comprises a synchronization signal frame, a beacon frame and a data frame, and the point-to-point communication method specifically comprises the following steps:

s301, sending a synchronization signal frame carrying beacon indication information, wherein the synchronization signal frame is used for realizing time domain and frequency domain synchronization of both communication parties.

The superframe of the ad hoc network communication may include: a synchronization signal frame, a beacon frame, and a data frame. The synchronization signal frame is used for enabling the two communication parties to realize synchronization in a time domain and a frequency domain, and the synchronization signal frame also carries beacon frame indication information used for indicating relevant information of a subsequent beacon frame.

S302, sending a beacon frame according to the beacon indication information, wherein the beacon frame is used for indicating the sending information of the data frame.

The beacon frame in the ad hoc network is used for indicating the transmission information of the subsequent data frame, and the transmission information may be the addresses of the transceivers of the data frame, and the like. The beacon frame may include a superframe description field and the like in addition to transmission information of the data frame. In the same superframe, after the synchronization signal frame is sent, the corresponding beacon frame can also be sent according to the beacon frame indication information carried in the synchronization signal frame.

S303, sending the data frame according to the sending information.

In the same superframe, the corresponding data frame is continuously transmitted after the beacon frame, and the data transmitting end (also referred to as transmitting UE) completes the transmission operation of the data carried in the data frame by transmitting the superframe.

Through the scheme in the embodiment, in the peer-to-peer communication process in the ad hoc network, the sending UE completes the data sending operation to the receiving node (i.e., the receiving UE) by sending the superframe. The synchronous signal frame carrying the beacon indication information is transmitted only at the beginning in the superframe so as to realize the synchronization of both communication parties in the superframe, an SHR synchronous head does not need to be transmitted in each frame in the superframe, and the transmission efficiency of effective data can be obviously improved. The scheme can be applied to the sending UE side in the communication process of the ad hoc network.

Specifically, referring to fig. 4, fig. 4 provides a schematic diagram of a data frame structure in an application example; the data frame is mapped into the MAC frame structure without a header portion. The payload portion includes a frame sequence number of 8 bytes and a data frame payload of several bytes. The Frame end is divided into a Frame Check Sequence (FCS).

In one embodiment, the synchronization signal frames include a primary synchronization signal frame and a secondary synchronization signal frame; the main synchronization signal frame is used for realizing the initial synchronization of both communication parties; and the auxiliary synchronization signal frame is used for realizing the accurate synchronization of both communication parties.

The synchronization signal frame is a part of a super frame transmitted by the transmitting UE, and the frame is used for enabling the receiving UE to realize time domain and frequency domain synchronization with the transmitting UE according to the frame. The synchronization Signal frame may include two parts, a primary synchronization Signal frame (PSS) and a Secondary synchronization Signal frame (SSS).

The primary synchronization information can be carried in the primary synchronization signal frame, and the receiving UE can realize primary synchronization with the sending UE according to the primary synchronization information. The initial synchronization may be time alignment and frequency domain synchronization between the receiving UE and the transmitting UE.

The auxiliary synchronization signal frame may carry accurate synchronization information, and the receiving UE may implement accurate synchronization with the sending UE according to the auxiliary synchronization signal frame, where the accurate synchronization may be frame synchronization of the receiving UE and the sending UE.

In this embodiment, the synchronization signal frame may further include a main synchronization signal frame and an auxiliary synchronization signal frame, which carry different synchronization information, and respectively implement initial synchronization and precise synchronization of both communication parties.

In one embodiment, the duration of the superframe includes a contention access period and a non-contention access period, and the beacon frame includes one or more of: attribute information of a contention access period and a non-contention access period in the duration of the superframe, beacon frame confirmation requirement information, and data frame confirmation requirement information.

Among them, similar to the superframe structure in ZigBee, a Contention Access Period (CAP) and a non-contention access period (CFP) may be included in the duration of a superframe in the ad hoc network communication.

According to the current service and the wireless environment of the ad hoc network, in the duration that the beacon frame may indicate a superframe, attribute information of a contention access period and a non-contention access period may specifically include: the number of occupied frames of CFP and CAP, the carrier frequency number used by CFP and CAP, the number of times of CFP and CAP repeating in superframe, the modulation mode of CFP and CAP, the error correction coding mode of CFP and CAP, the HARQ process number used for data transmission in CFP and CAP, and whether it is newly transmitted or not.

In addition, the beacon frame may further include information for beacon frame acknowledgement requirement and data frame acknowledgement requirement. The beacon frame confirmation requirement information indicates whether the beacon frame needs to receive the UE reply confirmation or not; the data frame acknowledgement requirement information indicates whether the data frame sent in the super frame needs to receive the UE reply acknowledgement.

In an embodiment, please continue to refer to fig. 3, after the step S302 in fig. 3 transmits a beacon frame according to the beacon indication information, before the step S303 transmits the data frame according to the transmission information, the method may further include the steps of: and when the beacon frame confirmation requirement information represents that the beacon frame needs to be confirmed, receiving a beacon reply frame corresponding to the beacon frame.

If beacon frame acknowledgement requirement information is included in the beacon frame, it may indicate that this beacon frame needs to receive a UE reply acknowledgement. If the receiving UE correctly receives the beacon frame, the receiving UE returns a beacon reply frame to the sending UE, where the beacon reply frame includes a reply field of the receiving UE to the beacon frame, and is used to represent that the receiving UE releases the remaining part capable of receiving the superframe, and when the sending UE receives the beacon reply frame, the sending UE continues to execute step S303 to send the remaining part of the superframe according to the beacon reply frame.

The beacon frame acknowledgement requirement information is indicated by a byte, 0 and 1 of the byte can be used to indicate whether the receiving UE needs to acknowledge the beacon frame, for example, 0 indicates that acknowledgement is needed, 1 indicates that acknowledgement is not needed, and the meanings of 0 and 1 can be interchanged or defined otherwise.

In addition, if the superframe sending UE does not receive the beacon reply frame or receives the beacon reply frame indicating that the remaining part of the superframe cannot be received or sent, the reception or sending of the remaining part of the superframe is stopped, and the corresponding channel resource is released.

For the beacon reply frame, see fig. 5 in particular, fig. 5 provides a schematic structural diagram of the beacon reply frame in an application example; the beacon reply frame is mapped to an MAC frame structure, and a frame header of the beacon reply frame comprises a frame control domain and an addressing domain; the frame load region comprises a field for indicating time and frequency domain resources of the data frame and confirmation information; and the frame end is the frame check sequence.

The time and frequency domain resource fields of the data frame are used for indicating the occupation duration of the data frame and a Carrier group or a frequency hopping sequence, and are used for avoiding Carrier Sense multiple access with Collision avoidance (CSMA/CA for short) by the receiving and transmitting adjacent nodes.

The acknowledgement information, which is information indicating acknowledgement of the beacon frame, may be represented by 4 bits, for example, 1111 indicates success, and others indicate failure and a reason for failure.

In this embodiment, in a communication superframe of an ad hoc network, after a sending UE sends a beacon frame, the receiving UE may be instructed to return a corresponding beacon reply frame according to beacon frame confirmation requirement information included in the beacon frame to determine whether the rest of the superframe is sent, thereby ensuring effective transmission of data in superframe communication; in addition, invalid data transmission can be judged in time according to the beacon reply frame, corresponding resources are released, and effective utilization of channel resources in the ad hoc network is guaranteed.

In an embodiment, please continue to refer to fig. 3, after step S303 in fig. 3 transmits the data frame according to the transmission information, the method may further include: and when the data frame confirmation requirement information represents that the data frame needs to be confirmed, receiving a data reply frame corresponding to the data frame.

And if the beacon frame contains the data frame acknowledgement requirement information, indicating that the data frame indicated by the beacon frame needs to receive the UE reply acknowledgement. If the receiving UE correctly receives the data frame, the receiving UE includes information (ACK) of successful sending in the data reply frame; if the receiving UE does not correctly receive the data frame, the data reply frame includes a transmission failure message (NACK) to notify the transmitting UE to retransmit the data frame.

Referring to fig. 6, fig. 6 is a schematic diagram illustrating a structure of a data recovery frame in an application example; the data reply frame is mapped to an MAC frame structure, and a frame header of the data reply frame comprises a frame control domain and an addressing domain; the frame load area comprises data confirmation information and routing confirmation information; and the frame end is the frame check sequence.

The data confirmation information is used for confirming whether the HARQ process is available, and the maximum number can indicate 8 HARQ processes. Available (ACK) may be represented by 1, and unavailable (NACK) may be represented by 0.

The route confirmation information is used to indicate whether a route is available. Can be represented by 2 bits. For example, 00 may indicate that the route is normal; 01, 10, 11 represent the route interruption and the reason.

In this embodiment, in a communication superframe of an ad hoc network, whether a data frame in the superframe needs to receive a data reply frame returned by a UE can be indicated in a beacon frame, after the UE sends the data frame, whether transmission of transmission data is successful can be determined according to the received data reply frame, and if not, data retransmission can be arranged, so that accuracy of data transmission is improved, and flexibility of both communication parties is improved. The data reply frame indicates the rapid reply of the receiving UE to the demodulation and decoding of the data frame, and if the correct demodulation (such as CRC check) passes, the data reply frame indicates success information; if the decoding fails (for example, the CRC fails), failure information is indicated in the data reply frame, so that the sending US can be retransmitted quickly, and the transmission efficiency is improved.

In one example of an application, the structure of the beacon frame may refer to fig. 7, fig. 8, and table 1.

FIG. 7 provides a schematic diagram of a beacon frame for point-to-point communication in an ad hoc network in an application example; the beacon frame includes a frame control field, an addressing field, an address of a PAN coordinator in the ad hoc network (PAN addresses, i.e., PANADDR in fig. 7), a superframe ID corresponding to the beacon, a description field of the superframe, and a frame check sequence.

The beacon frame is similar to the MAC frame in IEEE802.3, the frame control field and the addressing field are equivalent to the frame header of the MAC frame, the PAN ADDR is equivalent to the load of the MAC frame, the superframe ID corresponding to the beacon, and the description field and the frame check sequence of the superframe are equivalent to the frame end. The beacon frame can use a fixed QPSK modulation mode, and the channel coding adopts a convolutional code.

The addressing field is used for indicating the addresses of the sender and the receiver in the beacon frame, namely a source address and a target address. The destination address is the address corresponding to the receiving UE, the source address is the address of the sending UE, and the two addresses are respectively represented by 16 bits.

The beacon frame acknowledgement requirement information may be indicated in a frame control field of the beacon frame, specifically please refer to fig. 8, where fig. 8 provides a schematic structural diagram of the frame control field of the beacon frame in an application example; the 10 bytes of this frame control field indicate the following information, respectively:

the first 4 bytes (i.e., bytes 0-3) are used to indicate the frame type, then 2 bytes (bytes 4 and 5) are used to indicate the mode of the source address, and then 2 bytes (bytes 6 and 7) are used to indicate the mode of the target address, 1 byte (i.e., byte 8) indicates the beacon frame acknowledgement requirement information, and 1 byte (i.e., byte 9) serves as the frame pending bit.

The description field of the superframe in the beacon frame may contain data frame acknowledgement requirement information, and the structure of the description field of the superframe may be referred to the following table 1, where table 1 provides the structure of the control field of the superframe in an application example.

TABLE 1

In table 1, a Modulation and Coding Scheme (MCS) sub-field for indicating a combination of a Modulation Scheme (for example, QPSK/QAM16/QAM64) and a rate matching format of channel redundancy error correction Coding may define 16 combinations.

A Hybrid Automatic Repeat reQuest (HARQ) process, configured to divide a data frame into N HARQ processes with equal length, perform ACK/NACK reply on the N HARQ processes in a last ACK/NACK frame of the super frame, if feedback obtained by the nth HARQ is ACK, send new data in the HARQ process in a next super frame, and if the obtained feedback is NACK, retransmit the erroneous data in the HARQ process in the next super frame.

Carrier mapping mode in carrier group: both continuous and distributed may be included.

A carrier group number subfield/hopping indicator for indicating that the physical carrier frequency and the carrier group number or the hopping pattern have a mutual correspondence.

In one embodiment, the data frame is transmitted in the contention access period and the data reply frame is received in the non-contention access period.

Referring specifically to fig. 9, fig. 9 provides a schematic structural diagram of a superframe according to an embodiment of the present application; in the duration of the superframe, the data frame of the communication is sent in the contention access period (i.e. CAP in the figure), and in order to not occupy the data transmission resource of the contention access period, the data recovery frame of the data frame returned by the UE in the non-contention access period (i.e. CFP in the figure) of the superframe is received.

In this embodiment, the data reply frame is received in the CFP, so that transmission resources can be saved as much as possible for data transmission while ensuring the accuracy of communication. Compared with the superframe structure of the IEEE 802.15.4 protocol, the superframe structure provided by the embodiment of the application is more compact, improves the data transmission efficiency, and can dynamically schedule time and frequency domain resources and adjust the error correction coding and modulation mode of the physical layer in real time according to the current wireless environment.

In one embodiment, in the ad hoc network communication superframe, the synchronization signal frame and the beacon frame use the same carrier frequency.

The synchronization signal frame and the beacon frame may be transmitted using the same carrier frequency, and the data frame may be transmitted using the same or a different carrier frequency than the synchronization signal frame. In one embodiment, the peer-to-peer communication method in the ad hoc network may further include: and sending a reverse frame, wherein the reverse frame comprises a synchronization head and a data frame, and the synchronization head is used for realizing time domain and frequency domain synchronization of both communication parties.

Referring to fig. 10, fig. 10 is a schematic diagram of a structure of a reverse frame in an embodiment. The reverse frame in the frame structure is the sender of the non-superframe beacon frame of the sender, so in order to realize synchronization, a synchronization head needs to be added before a data unit, and the description of time and frequency domain resources related to the number of data frames, carrier frequency numbers, frame number, repetition times, modulation mode, error correction coding mode, retransmission or new transmission, whether confirmation is needed or not is described in the beacon frame, so that extra bit indication is not needed.

That is, in ad hoc network peer-to-peer communication, each transmitting UE may also serve as a receiving UE in another communication process to transmit a reverse frame to the transmitting UE in the communication. The beacon reply frame and the data reply frame are both reverse frames transmitted by the transmitting UE.

The forward frame in the frame structure refers to a data frame sent by a super frame beacon frame sending UE, and because a synchronization signal is existed before the beacon frame, the data frame is directly the data frame, and the time and frequency domain resource description related to the number of the data frame, the carrier frequency number, the frame number, the repetition times, the modulation mode, the error correction coding mode, the retransmission or the new transmission, whether the confirmation is needed or not is described in the beacon frame, so that the extra bit indication is not needed.

In an application example, please refer to fig. 11, fig. 11 provides a schematic diagram of a structure of a superframe according to an embodiment; the superframe includes a synchronization signal frame 111 (including a primary synchronization signal frame PSS and a secondary synchronization signal frame SSS), a beacon frame 112(beacon), a beacon reply frame 113 (which includes a synchronization header and a reply field (RL _ CFP) of the receiving UE to the beacon frame since the beacon reply frame is a reverse frame), a data frame 114 (for carrying communication data in the present superframe), and a data reply frame 115 (which also is a reverse frame and includes a synchronization header and a reply field (FL/RL _ CFP) of the receiving UE to the data frame). A transmission GAP (GAP) may be left between frames in the superframe.

An embodiment of the present application further provides a peer-to-peer physical layer communication device in an ad hoc network, please refer to fig. 12, where fig. 12 provides a schematic structural diagram of a peer-to-peer physical layer communication device in an ad hoc network; the synchronization signal frame, the beacon frame, and the data frame transmitted in the apparatus are included in the same superframe of the ad hoc network communication. The apparatus may include:

a synchronization signal frame sending module 121, configured to send a synchronization signal frame carrying beacon indication information, where the synchronization signal frame is used to implement time-domain and frequency-domain synchronization between two communication parties.

A beacon frame sending module 122, configured to send a beacon frame according to the beacon indication information, where the beacon frame is used to indicate sending information of a data frame.

A data frame sending module 123, configured to send the data frame according to the sending information.

For more details of the operating principle and the operating mode of the peer-to-peer physical layer communication device in the ad hoc network, reference may be made to the description in fig. 3 to fig. 11, which is not described herein again.

An embodiment of the present application further provides a peer-to-peer communication method in an ad hoc network, please refer to fig. 13, where fig. 13 provides a schematic flow diagram of another peer-to-peer communication method in an ad hoc network; the method comprises the following steps:

s131, receiving a synchronization signal frame sent by the sending UE, and carrying out time-frequency domain synchronization with the sending UE according to the synchronization signal frame, wherein the synchronization signal frame carries beacon indication information.

S132, receiving a beacon frame corresponding to the beacon indication information, where the beacon frame is used to indicate the transmission information of the data frame.

S133, receiving the data frame corresponding to the transmission information of the data frame.

Wherein the synchronization signal frame, the beacon frame and the data frame are contained in the same superframe of the ad hoc network communication.

The steps S131 to S133 are performed on the receiving UE side in the ad hoc network peer-to-peer communication. Corresponding to the transmitting UE, please refer to fig. 3, the receiving UE receives the superframe transmitted by the transmitting UE, wherein the superframe comprises a synchronization signal frame, a beacon frame and a data frame.

In one embodiment, after receiving the beacon frame indicated by the synchronization signal frame in step 132 in fig. 13, the method may further include: and generating a beacon reply frame according to the beacon frame, and sending the beacon reply frame.

The beacon reply frame includes acknowledgement information for the beacon frame, which is used to indicate information for acknowledging the beacon frame, and may be represented by 4 bits, for example 1111 bits, indicating success, that is, indicating that the sending UE continues to send other frames; other codes than 1111 indicate a failure and the reason for the failure, indicating that the sending UE is no longer sending other frames. The acknowledgement is carried in the frame loading area. The specific structure of the beacon reply frame can be seen in the example of the structure of the beacon reply frame provided in fig. 5.

In this embodiment, the receiving UE determines whether to continue communication according to the current communication status, and sends the determination result carried in the beacon reply frame to the sending UE.

In an embodiment, after receiving the data frame corresponding to the transmission information of the data frame in step 133 in fig. 13, the method may further include: and generating a data recovery frame according to the data frame, and sending the data recovery frame.

The data reply frame includes data confirmation information for the data frame, and the data confirmation information is carried in the frame load area. The data confirmation information is obtained according to the condition that the receiving UE receives the data frame and the condition that the data frame is decoded. The data reply frame indicates the rapid reply of the receiving UE to the demodulation and decoding of the data frame, and if the correct demodulation (such as CRC check) passes, the data reply frame indicates success; if the decoding fails (for example, the CRC fails), the indication in the data reply frame fails, so that the sending UE can quickly retransmit, and the transmission efficiency is improved. The specific structure of the beacon reply frame can be seen in the example of the structure of the data reply frame provided in fig. 6.

In this embodiment, after the UE sends the data frame, it can determine whether the transmission data is successfully sent according to the received data reply frame, and if not, it can arrange data retransmission, thereby improving the accuracy of data transmission and the flexibility of both communication parties.

An embodiment of the present application further provides a peer-to-peer physical layer communication device in an ad hoc network, please refer to fig. 14, where fig. 14 provides a schematic structural diagram of a peer-to-peer physical layer communication device in another ad hoc network; the synchronization signal frame, the beacon frame, and the data frame transmitted in the apparatus are included in the same superframe of the ad hoc network communication. The apparatus may include:

the synchronization signal frame receiving module 141 is configured to receive a synchronization signal frame, and perform time-domain and frequency-domain synchronization with the sending UE according to the synchronization signal frame.

A beacon frame receiving module 142, configured to receive a beacon frame indicated by the synchronization signal frame, where the beacon frame is used to indicate sending information of a data frame.

A data frame receiving module 143, configured to receive the data frame according to the sending information of the data frame.

An embodiment of the present application further provides a sending UE, including a memory and a processor, where the memory stores computer instructions executable on the processor. The processor, when executing the computer instructions, may perform the steps of the methods shown in fig. 3-11. The user equipment includes but is not limited to a mobile phone, a computer, a tablet computer and other terminal equipment.

The embodiment of the present application further provides a receiving UE, which includes a memory and a processor, where the memory stores computer instructions executable on the processor. The processor, when executing the computer instructions, may perform the steps of the method shown in fig. 13. The user equipment includes but is not limited to a mobile phone, a computer, a tablet computer and other terminal equipment.

In an application scenario, a sending UE and a receiving UE in an ad hoc network perform physical layer communication through a superframe, and an operation flow of the sending UE includes:

step one, a sender uses carrier sense multiple access with collision avoidance (CSMA/CA) when sending beacon frame carrier frequency, if the carrier frequency accords with the sending condition, the PSS, SSS and beacon frame are sent, otherwise, the CSMA/CA process is repeated. And if the beacon frame reply is needed, going to step two, and if the beacon frame reply is not needed, going to step three.

And step two, the sending UE receives the reply of the beacon frame, if the reply in the beacon reply frame can be continuously received, the sending UE sends the complete superframe data, and if the reply is not received or the reply cannot be continuously received, the sending UE stops continuously sending and returns to the step one.

And step three, sending the CAP data domain frame according to the current service and the reply in the previous beacon reply frame.

And step four, receiving a reply frame of the CAP data field frame.

The operation flow of the superframe receiving UE is as follows:

step one, receiving a primary synchronization frame PSS sequence ID detected by UE, and going to step two when a valid ID is detected.

And step two, detecting the ID of the SSS sequence of the auxiliary synchronization frame, and obtaining the frame length and the repetition times of the beacon frame.

Step three, demodulating and decoding the beacon frame to obtain the address of the receiving UE and the receiving parameter of the CAP data field, if the address of the receiving party is consistent with the address of the receiving party, determining whether to continue to receive the superframe according to the current state, if the superframe can be completely received and the beacon frame needs to be replied, sending the beacon reply frame to continue to receive, and going to step four, if the beacon reply frame cannot be sent to continue to receive or not send the beacon frame reply frame, ending the superframe receiving.

And step four, receiving the CAP data field frame according to the indication of the beacon frame, and going to step five after the receiving is finished.

And step five, sending the data recovery frame according to the demodulation and decoding result of the CAP number domain frame.

In this embodiment of the present application, the Core Network may be an evolved packet Core (EPC for short), a 5G Core Network (5G Core Network), or may be a novel Core Network in a future communication system. The 5G core is composed of a set of devices, and implements Access and mobility Management functions (AMF) for mobility Management and other functions, a User Plane Function (UPF) for providing packet routing forwarding and Quality of service (QoS) Management and other functions, and a Session Management Function (SMF) for providing Session Management, IP address allocation and Management and other functions.

A Base Station (BS) in the embodiment of the present application, which may also be referred to as a base station device, is a device deployed in a Radio Access Network (RAN) to provide a wireless communication function. For example, a device providing a base station function in a 2G network includes a Base Transceiver Station (BTS), a device providing a base station function in a 3G network includes a node b (nodeb), apparatuses for providing base station functionality in 4G networks include evolved node bs (enbs), which, in Wireless Local Area Networks (WLANs), the devices providing the base station function are an Access Point (AP), a device gNB providing the base station function in a New Radio (NR) of 5G, and a node B (ng-eNB) continuing to evolve, the gNB and the terminal communicate with each other by adopting an NR (NR) technology, the ng-eNB and the terminal communicate with each other by adopting an E-UTRA (evolved Universal Terrestrial Radio Access) technology, and both the gNB and the ng-eNB can be connected to a 5G core network. The base station in the embodiment of the present application also includes a device and the like that provide a function of the base station in a future new communication system.

The network on the network side in the embodiment of the present application refers to a communication network providing communication services for a terminal, and includes a base station of a radio access network, a base station controller of the radio access network, and a device on the core network side.

Definitions or descriptions of commonly used words:

a terminal in this embodiment may refer to various forms of User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station (mobile station, MS), a remote station, a remote terminal, a mobile device, a user terminal, a terminal device (terminal equipment), a wireless communication device, a user agent, or a user equipment. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with a Wireless communication function, a computing device or other processing devices connected to a Wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G Network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which is not limited in this embodiment.

In the embodiments of the present application, a unidirectional communication link from an access network to a terminal is defined as a downlink, data transmitted on the downlink is downlink data, and a transmission direction of the downlink data is referred to as a downlink direction; the unidirectional communication link from the terminal to the access network is an uplink, the data transmitted on the uplink is uplink data, and the transmission direction of the uplink data is referred to as an uplink direction.

It should be understood that the term "and or" is used herein to describe an association that describes an associated object, meaning that there may be three relationships, for example, a and or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "or" herein indicates that the former and latter related objects are in an "or" relationship.

"plurality" appearing in the embodiments of the present application means two or more.

The descriptions of the first, second, etc. appearing in the embodiments of the present application are for illustrative purposes and for distinguishing the objects of description, and do not indicate any particular limitation on the number of devices in the embodiments of the present application, and do not constitute any limitation on the embodiments of the present application.

"connect" in the embodiments of the present application refers to various connection manners, such as direct connection or indirect connection, to implement communication between devices, which is not limited in this embodiment of the present application.

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

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

The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions or computer programs. The procedures or functions according to the embodiments of the present application are wholly or partially generated when the computer instructions or the computer program are loaded or executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire or wirelessly. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more collections of available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. The semiconductor medium may be a solid state disk.

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

In the several embodiments provided in the present application, it should be understood that the disclosed method, apparatus and system may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative; for example, the division of the unit is only a logic function division, and there may be another division manner in actual implementation; for example, various elements or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

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

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a terminal (which may be a personal computer, a server, or a network device) to perform some steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

Although the present application is disclosed above, the present application is not limited thereto. Various changes and modifications can be easily made by those skilled in the art without departing from the spirit and scope of the present application, and it is intended to cover various combinations of functions, implementation steps, software and hardware, which are described above, and embodiments of the present application.

Claims

1. A method of peer-to-peer communication in an ad hoc network, the method comprising:

sending a synchronous signal frame carrying beacon indication information, wherein the synchronous signal frame is used for realizing time domain and frequency domain synchronization of both communication parties;

sending a beacon frame according to the beacon indication information, wherein the beacon frame is used for indicating the sending information of the data frame;

transmitting the data frame according to the transmission information;

2. The method of claim 1, wherein the synchronization signal frames comprise primary synchronization signal frames and secondary synchronization signal frames; the main synchronization signal frame is used for realizing the initial synchronization of both communication parties;

and the auxiliary synchronization signal frame is used for realizing the accurate synchronization of both communication parties.

3. The method of claim 1, wherein the duration of the superframe comprises a contention access period and a non-contention access period, and wherein the beacon frame comprises one or more of:

attribute information of a contention access period and a non-contention access period in the duration of the superframe, beacon frame confirmation requirement information, and data frame confirmation requirement information.

4. The method of claim 3, wherein after the transmitting a beacon frame according to the beacon indication information, before the transmitting the data frame according to the transmission information, further comprises:

and when the beacon frame confirmation requirement information represents that the beacon frame needs to be confirmed, receiving a beacon reply frame corresponding to the beacon frame.

5. The method of claim 4, wherein after the transmitting the data frame according to the transmission information, further comprising:

and when the data frame confirmation requirement information represents that the data frame needs to be confirmed, receiving a data reply frame corresponding to the data frame.

6. The method of claim 5, wherein the data frame is transmitted in the contention access period and the data reply frame is received in the non-contention access period.

7. The method of claim 1, wherein the synchronization signal frame and the beacon frame use the same carrier frequency in the ad hoc network communication superframe.

8. The method of claim 1, further comprising:

and sending a reverse frame, wherein the reverse frame comprises a synchronization head and a data frame, and the synchronization head is used for realizing time domain and frequency domain synchronization of both communication parties.

9. A method of peer-to-peer communication in an ad hoc network, the method comprising:

receiving a synchronous signal frame sent by sending UE, and carrying out time-frequency domain synchronization with the sending UE according to the synchronous signal frame, wherein the synchronous signal frame carries beacon indication information;

receiving a beacon frame corresponding to the beacon indication information, wherein the beacon frame is used for indicating the sending information of a data frame;

receiving a data frame corresponding to the sending information of the data frame;

10. The method of claim 9, wherein after receiving the beacon frame indicated by the synchronization signal frame, further comprising:

and generating a beacon reply frame according to the beacon frame, and sending the beacon reply frame.

11. The method according to claim 9, wherein after receiving the data frame corresponding to the transmission information of the data frame, further comprising:

and generating a data recovery frame according to the data frame, and sending the data recovery frame.

12. An apparatus for peer-to-peer physical layer communication in an ad hoc network, the apparatus comprising:

a synchronous signal frame sending module, configured to send a synchronous signal frame carrying beacon indication information, where the synchronous signal frame is used to implement time-domain and frequency-domain synchronization between two communication parties;

a beacon frame sending module, configured to send a beacon frame according to the beacon indication information, where the beacon frame is used to indicate sending information of a data frame;

a data frame sending module, configured to send the data frame according to the sending information;

13. An apparatus for peer-to-peer physical layer communication in an ad hoc network, the apparatus comprising:

a synchronization signal frame receiving module, configured to receive a synchronization signal frame sent by a sending UE, and perform time-domain and frequency-domain synchronization with the sending UE according to the synchronization signal frame, where the synchronization signal frame carries beacon indication information;

a beacon frame receiving module, configured to receive a beacon frame corresponding to the beacon indication information, where the beacon frame is used to indicate sending information of a data frame;

the data frame receiving module is used for receiving a data frame corresponding to the sending information of the data frame; wherein the synchronization signal frame, the beacon frame and the data frame are contained in the same superframe of the ad hoc network communication.

14. A transmitting UE comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method of any one of claims 1 to 8.

15. A receiving UE comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method of any of claims 9 to 11.