CN114375052A

CN114375052A - Communication method and apparatus

Info

Publication number: CN114375052A
Application number: CN202111682195.9A
Authority: CN
Inventors: 张宏彬; 朱源泉
Original assignee: Shenzhen Chenggu Technology Co ltd
Current assignee: Shenzhen Chenggu Technology Co ltd
Priority date: 2021-07-30
Filing date: 2021-12-28
Publication date: 2022-04-19

Abstract

The application is applicable to the technical field of traffic communication, and provides a communication method, which comprises the following steps: the method comprises the steps that a main device initiates a frame management time slot of a wireless frame, and relevant information is distributed to a slave device broadcast time slot in a communication area of the main device in the frame management time slot, wherein the wireless frame comprises the frame management time slot, a downlink packet data time slot and an uplink packet data time slot; the master device and the slave device respectively transmit communication contents in corresponding time slots of the wireless frame based on the time slot allocation related information, and the communication contents are used for communication between the master device and the slave device. The method and the device can realize ordered communication between the master device and the slave devices, can avoid network congestion caused by competition of network resources of the master device by a plurality of slave devices, and are favorable for realizing stable and reliable communication between the master device and the slave devices in a communication area of the master device.

Description

Communication method and apparatus

Technical Field

The present application relates to the field of traffic communication technologies, and in particular, to a communication method and device.

Background

In the existing communication technology, when wireless communication is performed between a master device and a slave device, the slave device generally acquires wireless network resources of the master device in a resource autonomous contention manner.

In the related art, if the number of slave devices to be accessed is larger, network congestion or even blocking is more likely to occur, which results in unstable communication between the master device and the slave devices.

Disclosure of Invention

The embodiment of the application provides a communication method and equipment, and aims to solve the problem that in the related art, if the number of accessed slave equipment is larger, network congestion or even blocking is more likely to occur, so that communication between master equipment and slave equipment is unstable.

In a first aspect, an embodiment of the present application provides a communication method, where the method includes:

the method comprises the steps that a main device initiates a frame management time slot of a wireless frame, and relevant information is distributed to a slave device broadcast time slot in a communication area of the main device in the frame management time slot, wherein the wireless frame comprises the frame management time slot, a downlink packet data time slot and an uplink packet data time slot;

the master device and the slave device respectively transmit communication contents in corresponding time slots of the wireless frame based on the time slot allocation related information, and the communication contents are used for communication between the master device and the slave device.

Further, the radio frame further includes: randomly accessing a time slot;

the random access time slot is used for a target slave device to send an access request to a master device, the access request is used for requesting the master device to allocate a resource time slot to the target slave device in a next wireless frame, the resource time slot comprises at least one of a downlink packet data time slot and an uplink packet data time slot, and the target slave device is a slave device which is not allocated with the resource time slot in a communication area of the master device.

Further, the master device and the slave device each transmit communication content in a corresponding time slot of the radio frame based on the time slot allocation related information, including:

if the slot allocation-related information indicates that there are multiple random access slots, the target slave device may send an access request to the master device in any of the multiple random access slots.

if the time slot allocation related information indicates that the master device is allocated with the downlink packet data time slot aiming at the slave device, the master device sends the communication content aiming at the corresponding slave device to the corresponding slave device in the corresponding downlink packet data time slot.

and for each slave device in the communication area of the master device, if the time slot allocation related information indicates that the slave device is allocated with an uplink packet data time slot, the slave device transmits communication content to the master device in the corresponding uplink packet data time slot.

Further, each slave device within the communication area of the master device may receive the communication content transmitted by the master device by:

the slave device determines the monitoring starting time of the downlink packet data time slot aiming at the slave device according to the time slot distribution related information, and starts the monitoring of the communication content sent to the slave device by the master device at the determined monitoring starting time, wherein the monitoring starting time is close to and earlier than the arrival time of the downlink packet data time slot.

Further, the master device is a road side unit, and the slave device is an on-board unit.

Further, the data structure of the communication content of each time slot in the radio frame comprises: a preamble part and a data part, the preamble part including a short sequence and a long sequence connected in sequence;

the long sequence corresponding to the frame management time slot is a first long sequence, the long sequence corresponding to the time slot except the frame management time slot in the wireless frame is a second long sequence, and the first long sequence and the second long sequence are in an orthogonal relation.

In a second aspect, an embodiment of the present application provides a master device, including:

the radio frequency transceiver is used for broadcasting time slot allocation related information to the slave equipment in a communication area of the master equipment in a frame management time slot of a radio frame initiated by the master equipment, transmitting communication content to the slave equipment in a corresponding time slot of the master equipment and receiving the communication content transmitted by the slave equipment in a corresponding time slot of the slave equipment, wherein the radio frame comprises the frame management time slot, a downlink packet data time slot and an uplink packet data time slot, and the communication content is used for communication between the master equipment and the slave equipment;

and the processor is used for initiating a frame management time slot of the wireless frame, determining a corresponding time slot of the master device in the wireless frame based on the time slot allocation related information, and determining a corresponding time slot of the slave device in the wireless frame.

In a third aspect, an embodiment of the present application provides a slave device, including:

the radio frequency transceiver is used for receiving time slot management information broadcasted by the master equipment in a frame management time slot of a radio frame, receiving communication content sent by the master equipment in a corresponding time slot shared by the master equipment and the slave equipment, and sending the communication content to the master equipment in the corresponding time slot of the slave equipment, wherein the radio frame comprises the frame management time slot, a downlink packet data time slot and an uplink packet data time slot, and the communication content is used for communication between the master equipment and the slave equipment;

and the processor is used for determining the corresponding time slot of the master device in the wireless frame and determining the corresponding time slot of the slave device in the wireless frame based on the time slot allocation related information.

Compared with the related technology, the embodiment of the application has the beneficial effects that: the master device allocates time slots for communication to the master device and the slave device through the wireless frame, the master device and the slave device can send communication contents in the respective allocated time slots, ordered communication between the master device and the slave device is achieved, network congestion caused by competition of network resources of the master device by a plurality of slave devices can be avoided, and stable and reliable communication between the master device and the slave device in a communication area of the master device is facilitated.

It is to be understood that, the beneficial effects of the second to third aspects may be referred to the related description of the first aspect, and are not described herein again.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments or the related technical descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic flow chart of a communication method according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a radio frame according to an embodiment of the present application;

FIG. 3 is a timing diagram illustrating communication between a master device and a slave device according to an embodiment of the present application;

FIG. 4 is a schematic diagram illustrating a road information communication scenario in which the communication method provided by an embodiment of the present application is applied;

fig. 5 is a schematic data structure diagram of communication contents of each time slot according to another embodiment of the present application;

fig. 6 is a schematic flowchart of a receiving apparatus of a master device or a slave device receiving communication content of each time slot according to an embodiment of the present application;

FIG. 7 is a schematic structural diagram of a host device according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a slave device according to an embodiment of the present application.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to" determining "or" in response to detecting ". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".

Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.

Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.

In order to explain the technical means of the present application, the following examples are given below.

Referring to fig. 1, an embodiment of the present application provides a communication method, including:

step 101, the master device initiates a frame management timeslot of a radio frame, and broadcasts timeslot allocation related information to the slave devices in the communication area of the master device at the frame management timeslot.

The radio Frame may include a Frame Management Slot (FMS), a DownLink Packet Data Slot (DL-PDS), and an UpLink Packet Data Slot (UL-PDS) that are consecutive in time. The FMS is the first slot of a radio frame. In practical applications, there is usually only one FMS in each radio frame, there may be a first number of DL-PDSs, and there may be a second number of UL-PDSs, and the first number and the second number may be the same or different. The communication area is generally referred to as a signal coverage area.

The timeslot allocation related information is generally information describing allocation of each timeslot in a radio frame. For example, in the timeslot allocation related information, 2 DL-PDS and 3 UL-PDS may be indicated, and 1 st DL-PDS may be indicated for the master device to transmit communication content to the slave device 1, 2 nd DL-PDS may be indicated for the master device to transmit communication content to the slave device 2, 1 st UL-PDS may be indicated for the slave device 1 to transmit communication content to the master device, and 2-3 rd UL-PDS may be indicated for the slave device 2 to transmit communication content to the master device.

Here, the master device may generate timeslot allocation related information, and then broadcast the timeslot allocation related information to the slave devices in the communication area of the master device in the FMS of the radio frame in a broadcast manner, so that the master device controls the master device and the slave devices to perform ordered communication through the timeslot allocation related information.

In practice, the master device may generate the slot allocation-related information according to the number of slave devices in the current communication area, device identifications of the slave devices, the channel occupancy, and the like. As an example, the master device may generate the slot allocation-related information using the device identification of each slave device when the channel occupancy is less than the preset occupancy threshold.

It should be noted that two adjacent radio frames may be continuous in time or discontinuous.

In practical applications, the master device may determine whether to initiate a new radio frame according to a network deployment situation, a related configuration, and the like. As an example, the master device may continuously initiate a new radio frame according to the configuration, or discontinuously initiate a new radio frame every configured duration period.

And 102, the master device and the slave device respectively transmit communication contents in corresponding time slots of a wireless frame based on the time slot allocation related information, wherein the communication contents are used for communication between the master device and the slave device.

Here, after the master device broadcasts the slot allocation related information at the FMS of the radio frame, the master device may determine one or more DL-PDSs allocated to the master device and slave devices to which each DL-PDS is directed, based on the slot allocation related information, so that the master device may transmit communication contents to the corresponding slave devices in each DL-PDS. In addition, the slave device may determine one or more UL-PDSs allocated to the slave device according to the slot allocation-related information after receiving the slot allocation-related information, so that the slave device may transmit communication contents to the master device in the respective UL-PDSs. Note that if there are a plurality of UL-PDS allocated to a slave device, the plurality of UL-PDS are temporally consecutive.

According to the method provided by the embodiment, the master device allocates the time slots for communication to the master device and the slave device through the wireless frame, the master device and the slave device can send communication contents in the respective allocated time slots, ordered communication between the master device and the slave device is realized, network congestion caused by competition of network resources of the master device by a plurality of slave devices can be avoided, and stable and reliable communication between the master device and the slave device in a communication area of the master device is facilitated.

It should be noted that, in the present application, on the basis of the existing Wi-Fi physical layer technology, a master device is introduced as a scheduling center management mode, and by redesigning a Media Access Control (MAC) packet mode and adjusting a physical frame structure, an unordered resource contention mode is improved to an ordered radio frame timing structure, so as to achieve the purposes of stable low latency and high reliability.

In an optional implementation manner of each embodiment of the present application, the radio frame may further include: random Access Slot (RAS).

The RAS is used for the target slave device to send an access request to the master device, the access request is used for requesting the master device to allocate resource time slots to the target slave device in the next wireless frame, the resource time slots comprise at least one of UL-PDS and DL-PDS, and the target slave device is a slave device which is not allocated with the resource time slots in a communication area of the master device.

Here, the RAS is usually a timeslot located at the end of a radio frame, and there may be one RAS, multiple RAS, or no RAS in a radio frame, and the specific number of RAS is usually allocated and implemented by the master device through timeslot allocation related information. In addition, the number of UL-PDS may be different, the number of DL-PDS may be different, and the number of RAS may be different in every two radio frames. In practical applications, the number of UL-PDS, DL-PDS, and RAS in each radio frame is usually determined by the master device in combination with a preset allocation rule and actual communication scenario requirements.

Fig. 2 is a schematic structural diagram of a radio frame according to an embodiment of the present application. The radio frame in fig. 2 has m + n + k +1 slots, where the first slot is the FMS followed by m DL-PDS, m DL-PDS followed by n UL-PDS, and n UL-PDS followed by k RAS. Each two adjacent time slots in fig. 2 are consecutive in time.

It should be noted that, by setting the RAS in the radio frame, it is possible to allocate resource slots to slave devices that are not allocated resource slots as needed. The master device actively allocates the resource time slot and the slave device requests to allocate the resource time slot, and the two allocation modes coexist, so that the master device can allocate the resource time slot to the slave device more flexibly.

In practical applications, the slave may request allocation of resource slots through the RAS, usually after the slave enters the communication area of the master and before the slave is first allocated with resource slots. After the slave device is allocated the resource slot, it can actively communicate with the master device through the resource slot. After a slave device is assigned a resource slot, the master device may dynamically assign the slave device a resource slot in a subsequent radio frame based on the communication needs of the slave device.

In the foregoing implementation, the method for a master device and a slave device to transmit communication content in a corresponding timeslot of a radio frame based on timeslot allocation related information includes:

The target slave device is a slave device which is not allocated with the resource time slot in the communication area of the master device.

Here, the target slave device, after receiving the slot allocation-related information, may learn the number of RAS in the current radio frame by analyzing the slot allocation-related information, and then may transmit an access request to the master device at any one random access slot. In practical applications, if two or more first target devices simultaneously compete for the same RAS, there may be a collision of the access request, and at this time, the collided slave device may continue to initiate the access request at the RAS of the next frame. It should be noted that, because the number of target slave devices is usually small in the communication area of a certain master device, the collision probability of access requests is usually very small, and stable communication between the master device and the slave devices in the communication area of the master device can still be ensured.

Fig. 3 is a timing diagram of communication between a master device and a slave device according to an embodiment of the present application. In fig. 3, the Frame1 is the 1 st radio Frame for communication between the master device and the slave device, the Frame2 is the 2 nd radio Frame, and the Frame3 is the 3 rd radio Frame.

In the 1 st radio frame, the master broadcasts the timeslot allocation related information to the slave at the FSM, and the slave is a slave to which no resource timeslot is allocated.

In the 2 nd radio frame, the master broadcasts at the FSM slot allocation related information to the slaves, which are allocated resource slots, in particular a DL-PDS for the slaves to receive traffic and a UL-PDS for the slaves to send traffic to the master. At this time, the master device transmits the data resource to the slave device at the DL-PDS, and the slave device transmits information for confirming the successful reception of the data resource to the master device at the UL-PDS.

In the 3 rd wireless frame, the master device broadcasts time slot allocation related information to the slave device in the FSM, and the master device and the slave device respectively send communication contents in corresponding time slots of the wireless frame according to the time slot allocation modes indicated by the time slot allocation related information. The following radio frames and so on.

In an optional implementation manner of each embodiment of the present application, the sending, by the master device and the slave device, communication content in a corresponding timeslot of a radio frame based on timeslot allocation related information may include:

if the slot allocation-related information indicates that the master device is allocated with a DL-PDS for the slave device, the master device transmits communication contents for the corresponding slave device to the corresponding slave device at the corresponding DL-PDS.

Here, the master device may obtain one or more DL-PDSs and the slave device to which each DL-PDS points according to the indication of the timeslot allocation related information, so that the master device may sequentially transmit communication contents to the corresponding slave devices in the time sequence of each DL-PDS.

In an optional implementation manner of each embodiment of the present application, the master device and the slave device each transmit communication content in a corresponding timeslot of a radio frame based on timeslot allocation related information, including:

for each slave device in the communication area of the master device, if the time slot allocation related information indicates that the slave device is allocated with the UL-PDS, the slave device transmits communication content to the master device at the corresponding UL-PDS.

Here, each slave device may transmit communication content to the master device at the corresponding allocated one or more UL-PDS.

In an optional implementation manner of various embodiments of the present application, each slave device in the communication area of the master device may receive the communication content sent by the master device by:

the slave device determines the listening starting time of the DL-PDS aiming at the slave device according to the time slot allocation related information, and starts to listen the communication content sent to the slave device by the master device at the determined listening starting time.

Wherein the listening start time is close to and earlier than the arrival time of the DL-PDS. The listen start time is generally the time for starting the listen.

In practical applications, since the duration occupied by each time slot is usually fixed, such as 1 ms, the slave device may determine the arrival time of the DL-PDS for the slave device based on the time slot allocation related information. Thereafter, the slave device may initiate a listening function prior to the arrival time to receive the communication content transmitted by the master device to the slave device. In practice, the listen start time is typically one slot ahead of the arrival time by a corresponding length of time.

Here, the slave device may be in a low power consumption state, e.g., a sleep state, after the FSM, before the DL-PDS for the slave device arrives, so that power may be saved and device power consumption may be reduced.

In an optional implementation manner of each embodiment of the present application, the master device is a Roadside Unit (RSU), and the slave device is an On Board Unit (OBU). There is at least one RSU and at least one OBU within the communication area of each RSU.

It should be noted that, the master device is an RSU, and the slave device is an OBU, and the method provided by the present application may be applied to the field of highway information communication. With the RSU as the master, the communication area can reach hundreds or even kilometers. The communication management of a large number of OBUs with a small number of RSUs can be realized. Which helps to reduce the communication costs for communication between the RSU and the OBU.

Fig. 4 is a schematic view illustrating that the communication method provided in the embodiment of the present application is applied to a road information communication scenario. As shown in fig. 4, the RSUs are deployed on highway gantries, and the distance between every two gantries can reach more than 1 km. One OBU for each vehicle. There may be one or more OBUs in all lanes within the RSU coverage area. In fig. 4, there are 4 OBUs, namely OBU1, OBU2, OBU3 and OBU4, within the RSU coverage area.

In this application scenario, the RSU as a master device generally broadcasts the timeslot allocation related information at the FSM, and coordinates all OBUs in the coverage area for resource scheduling. The OBU as a slave may request access or request resources. The RSU can realize the broadcasting or unicasting function by configuring the IP address of the MAC frame header, and through the function, the RSU can broadcast the road condition information to all OBUs in the coverage area and can also issue instructions and the like to a specific OBU. The OBU can apply for wireless resources to download and upload data packets and the like in the access state.

In an optional implementation manner of various embodiments of the present application, the data structure of the communication content of each time slot in the radio frame includes: the data transmission device comprises a preamble part and a data part, wherein the preamble part comprises a short sequence and a long sequence which are connected in sequence.

The long sequence corresponding to the FMS is a first long sequence, the long sequence corresponding to the time slot except the FMS in the wireless frame is a second long sequence, and the first long sequence and the second long sequence are in an orthogonal relation.

In practical applications, the communication content of each time slot generally needs to follow a preset data structure.

Fig. 5 is a schematic data structure diagram of communication content of each time slot according to an embodiment of the present application. The data structure shown in fig. 5 includes a short sequence, a long sequence, and a data portion arranged in order.

In practical applications, the short sequence may be: {0, 0, 1+ j, 0, 0, 0, -1-j, 0, 0, 0, 1+ j, 0, 0, 0, -1-j, 0, 0, 0, -1-j, 0, 0, 0, 0, 1+ j, 0, 0, 0, 0, 0, 0, 0, -1-j, 0, 0, 0, 0, 1+ j, 0, 0, 0, 1+ j, 0, 0, 0, 1+ j, 0, 0 }.

The first long sequence may be: {1,1, -1, -1,1,1, -1,1, -1,1,1,1,1,1,1, -1, -1,1,1, -1,1, -1,1,1,1,1,0,1, -1, -1,1,1, -1,1, -1,1, -1, -1, -1, -1, -1,1,1, -1, -1,1, -1,1, -1,1,1,1,1}.

The second long sequence may be: {1,1,1,1, -1,1, -1,1, -1, -1,1,1, -1, -1, -1, -1, -1,1, -1,1, -1,1,1, -1, -1,1,0,1,1,1,1, -1,1, -1,1,1, -1, -1,1,1,1,1,1,1, -1,1, -1,1,1, -1, -1,1,1}.

It should be noted that the second long sequence may also be another sequence orthogonal to the first long sequence, and this embodiment is not particularly limited.

Here, the long sequence corresponding to the FSM is different from the long sequences corresponding to other timeslots, so that the slave device can accurately identify the data of the FSM and the data of the non-FMS. In addition, the first long sequence and the second long sequence are in an orthogonal relation, so that the first long sequence and the second long sequence can be identified more quickly and accurately, and the accurate identification of the FSM data and the non-FMS data by the slave device can be further improved.

It should be noted that before sending out the communication content of each time slot, the master device or the slave device generally needs to process the communication content to be sent into baseband time domain data convenient for the transmitting device to transmit, and in addition, the transmitting device may up-convert the baseband time domain data of each time slot and transmit the baseband time domain data through the radio frequency port.

Specifically, the transmitting device may process the communication content of the time slot into baseband time domain data for transmission by the transmitting device by performing the following steps:

first, the transmitting apparatus performs Inverse Fast Fourier Transform (IFFT) on the short sequence to generate corresponding time domain data, performs Fast Fourier Transform (FFT) points with a length of 1/4, and copies 10 cycles to obtain time domain data corresponding to the short sequence. Here, the operation of copying 10 cycles can achieve the receiving device with sufficient time for power adaptation and frame header synchronization during frame header detection.

Then, the transmitting device selects according to the time slot type, if the time slot type is FMS, the first long sequence is selected; if not FMS, then choose the second long sequence. The transmitting device performs IFFT on the selected long sequence to generate corresponding time domain data, adds a half-length prefix and copies 2 periods, thereby obtaining the time domain data corresponding to the long sequence. Here, the long sequence may be used for frequency offset estimation, fine timing, and the like.

Finally, the transmitting device converts the data of the data portion into Orthogonal Frequency Division Multiplexing (OFDM) data symbols. Here, the generation process of the OFDM data symbol is completely consistent with the OFDM technology operation given in the IEEE 802.11-2016 standard, and is not described herein again.

It should be noted that, the sequential combination of the time domain data corresponding to the short sequence, the time domain data corresponding to the long sequence, and the data symbol corresponding to the data portion is the baseband time domain data convenient for the transmitting apparatus to transmit.

Fig. 6 is a schematic flowchart of a receiving apparatus of a master device or a slave device receiving communication content of each time slot according to an embodiment of the present application.

As shown in fig. 6, the receiving device receiving the communication content of each time slot may include the following

steps

601 and 604.

Step 601, the receiving device starts listening.

Here, the receiving apparatus may receive the down-converted baseband time domain data from the radio frequency port in a listening state.

Step 602, the receiving device performs short sequence frame header detection.

Here, the receiving apparatus may detect a frame header start coarse position of the communication content of the slot based on the short sequence of the preamble portion.

Step 603, the receiving device performs long sequence frame header detection.

Here, the receiving apparatus can detect the frame header start fine position of the communication content of the slot based on the long sequence of the preamble portion.

Specifically, the receiving device may detect the FMS frame header start fine position by using the first long sequence, and detect the non-FMS frame header start fine position by using the second long sequence.

Here, the coarse positioning and the fine positioning are two relative concepts, and the combination of the short sequence and the long sequence can realize accurate positioning of the frame header of the data transmitted by each time slot.

In practice, for each radio frame, the receiving apparatus of the slave device may perform a synchronization search using the first long sequence before listening to the FSM and perform a synchronization search using the second long sequence after listening to the FSM. The data processing efficiency can be improved.

In step 604, the receiving device demodulates the data portion to obtain the effective communication data.

Here, the receiving apparatus may extract data of a corresponding length symbol by symbol after confirming the data symbol position, thereby obtaining data transmitted by a corresponding slot.

With continuing reference to fig. 7, embodiments of the present application further provide a master device that includes a radio frequency transceiver 701 and a processor 702, wherein,

a radio frequency transceiver 701, configured to broadcast, at a frame management timeslot of a radio frame initiated by a master device, information related to timeslot allocation to a slave device in a communication area of the master device, transmit communication content to the slave device at a corresponding timeslot of the master device, and receive, at a corresponding timeslot of the slave device, the communication content transmitted by the slave device, where the radio frame includes the frame management timeslot, a downlink packet data timeslot, and an uplink packet data timeslot, and the communication content is used for communication between the master device and the slave device;

a processor 702 configured to initiate a frame management slot of the wireless frame, and determine a corresponding slot of the master device in the wireless frame and a corresponding slot of the slave device in the wireless frame based on the slot allocation related information.

With continuing reference to fig. 8, embodiments of the present application further provide a slave device including a radio frequency transceiver 801 and a processor 802, wherein,

a radio frequency transceiver 801, configured to receive timeslot management information broadcasted by a master device in a frame management timeslot of a radio frame, receive communication content sent by the master device in a corresponding timeslot shared by the master device and a slave device, and send the communication content to the master device in a corresponding timeslot of the slave device, where the radio frame includes the frame management timeslot, a downlink packet data timeslot, and an uplink packet data timeslot, and the communication content is used for communication between the master device and the slave device;

a processor 802 configured to determine a corresponding slot of the master device in the radio frame and determine a corresponding slot of the slave device in the radio frame based on the slot allocation related information

In the embodiment of the application, the master device allocates the time slots for communication to the master device and the slave device through the wireless frame, and the master device and the slave device can transmit communication contents in the respective allocated time slots, so that the master device and the slave device can communicate in order, network congestion caused by competition of network resources of the master device by a plurality of slave devices can be avoided, and stable and reliable communication between the master device and the slave device in a communication area of the master device is facilitated.

It should be noted that, because the contents of information interaction, execution process, and the like between the master device and the slave device are based on the same concept as that of the embodiment of the method of the present application, specific functions and technical effects thereof may be referred to specifically in the section of the embodiment of the method, and are not described herein again.

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

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

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

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

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

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

Claims

1. A method of communication, the method comprising:

the method comprises the steps that a master device initiates a frame management time slot of a wireless frame, and distributes related information to a slave device broadcast time slot in a communication area of the master device in the frame management time slot, wherein the wireless frame comprises the frame management time slot, a downlink packet data time slot and an uplink packet data time slot;

the master device and the slave device respectively transmit communication content in corresponding time slots of the wireless frame based on the time slot allocation related information, and the communication content is used for communication between the master device and the slave device.

2. The communication method of claim 1, wherein the radio frame further comprises: randomly accessing a time slot;

the random access time slot is used for a target slave device to send an access request to the master device, the access request is used for requesting the master device to allocate resource time slots to the target slave device in a next radio frame, the resource time slots comprise at least one of downlink packet data time slots and uplink packet data time slots, and the target slave device is a slave device which is not allocated with the resource time slots in a communication area of the master device.

3. The communication method according to claim 2, wherein the master device and the slave device each transmit communication content in a corresponding time slot of the radio frame based on the time slot allocation-related information, and the method comprises:

if the timeslot allocation related information indicates that a plurality of random access timeslots exist, the target slave device may send the access request to the master device in any one of the plurality of random access timeslots.

4. The communication method according to claim 1, wherein the master device and the slave device each transmit communication content in a corresponding time slot of the radio frame based on the time slot allocation-related information, and the method comprises:

if the time slot allocation related information indicates that the master device is allocated with a downlink packet data time slot for the slave device, the master device sends communication content for the corresponding slave device to the corresponding slave device in the corresponding downlink packet data time slot.

5. The communication method according to claim 1, wherein the master device and the slave device each transmit communication content in a corresponding time slot of the radio frame based on the time slot allocation-related information, and the method comprises:

6. The communication method according to claim 1, wherein each slave device within the communication area of the master device receives the communication content transmitted by the master device by:

the slave device determines the monitoring starting time of the downlink packet data time slot aiming at the slave device according to the time slot distribution related information, and starts to monitor the communication content sent to the slave device by the master device at the determined monitoring starting time, wherein the monitoring starting time is close to and earlier than the arrival time of the downlink packet data time slot.

7. The communication method according to claim 1, wherein the master device is a roadside unit and the slave device is an on-board unit.

8. The communication method according to any of claims 1 to 7, wherein the data structure of the communication content of each time slot in the radio frame comprises: a preamble part and a data part, the preamble part including a short sequence and a long sequence connected in sequence;

the frame management time slot is a long sequence corresponding to the frame management time slot, the wireless frame is a long sequence corresponding to the time slot except the frame management time slot, and the first long sequence and the second long sequence are in an orthogonal relation.

9. A master device, comprising:

the radio frequency transceiver is used for broadcasting time slot allocation related information to the slave equipment in a communication area of the master equipment in a frame management time slot of a radio frame initiated by the master equipment, transmitting communication content to the slave equipment in a corresponding time slot of the master equipment, and receiving the communication content transmitted by the slave equipment in a corresponding time slot of the slave equipment, wherein the radio frame comprises the frame management time slot, a downlink packet data time slot and an uplink packet data time slot, and the communication content is used for communication between the master equipment and the slave equipment;

a processor, configured to initiate a frame management timeslot of the wireless frame, and determine, based on the timeslot allocation-related information, a corresponding timeslot of the master device in the wireless frame, and a corresponding timeslot of the slave device in the wireless frame.

10. A slave device, comprising:

the radio frequency transceiver is used for receiving time slot management information broadcasted by a master device in a frame management time slot of a radio frame, receiving communication content sent by the master device in a corresponding time slot shared by the master device and a slave device, and sending the communication content to the master device in a corresponding time slot of the slave device, wherein the radio frame comprises the frame management time slot, a downlink packet data time slot and an uplink packet data time slot, and the communication content is used for communication between the master device and the slave device;

a processor configured to determine a corresponding slot of the master device in the radio frame and determine a corresponding slot of the slave device in the radio frame based on the slot allocation-related information.