CN113660643A - Communication method and device for vehicle-road cooperation - Google Patents

Communication method and device for vehicle-road cooperation Download PDF

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Publication number
CN113660643A
CN113660643A CN202110868136.4A CN202110868136A CN113660643A CN 113660643 A CN113660643 A CN 113660643A CN 202110868136 A CN202110868136 A CN 202110868136A CN 113660643 A CN113660643 A CN 113660643A
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time slot
information
vehicle
equipment
road side
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CN202110868136.4A
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CN113660643B (en
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朱源泉
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Shenzhen Chenggu Technology Co ltd
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Shenzhen Chenggu Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0289—Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Traffic Control Systems (AREA)

Abstract

The application is suitable for the technical field of vehicle-road cooperation, and provides a communication method for vehicle-road cooperation, which comprises the following steps: the method comprises the steps that the road side equipment manages time slots in frames of wireless frames, time slot management information is broadcasted to vehicle-mounted equipment in a communication area of the road side equipment, and the time slot management information comprises time slot distribution information and time slot distribution information; and the road side equipment and the vehicle-mounted equipment respectively send time slot information in corresponding time slots of the wireless frame based on the time slot management information, and the time slot information is used for communication between the road side equipment and the vehicle-mounted equipment. The method and the device can realize stable and reliable communication between the vehicle-mounted equipment and the road side equipment in the communication area of the vehicle-mounted equipment.

Description

Communication method and device for vehicle-road cooperation
Technical Field
The application belongs to the technical field of vehicle-road cooperation, and particularly relates to a communication method and equipment for vehicle-road cooperation.
Background
The vehicle-road cooperation is an important means for improving the environmental protection, safety, efficiency and comfort of road traffic, road facilities need to send road-road cooperation information such as roads, traffic and environment to vehicles and travelers, and the vehicles and travelers also need to send information such as vehicle states and sensing states to the road facilities. Therefore, one or more wireless communication technologies are needed between the road side facilities and the vehicles to support the vehicle-road cooperative information transceiving. The existing vehicle road wireless communication technology mainly comprises the following steps:
1. electronic Toll Collection (ETC): the ETC system is one of the service functions of an intelligent transportation system, and is currently widely used for highway or parking charging and the like due to low product cost. The domestic ETC communication standard is GB/T20851-series 2019. The ETC system adopts the vehicle automatic identification technology to finish the wireless data communication between the vehicle and the toll station, and carries out the vehicle automatic induction identification and the exchange of the related toll data. When the vehicle passes through the toll station or the road portal frame, the roadside device sends out awakening and inquiry signals, and the vehicle-mounted device responds, and carries out bidirectional communication and data exchange.
Defects of ETC: ETC carries out wireless communication based on an Amplitude Shift Keying (ASK) modulation mode and an FM0 coding mode, has simple communication technology, low communication speed (the downlink bit rate is only 256kbps), low performances such as anti-jamming capability, transmission distance, communication delay and the like, and is difficult to meet the current and future vehicle-road communication requirements.
2. Vehicle Long Term Evolution technology (Long Term Evolution Vehicle, LTE-V): LTE-V is a wireless communication standard defined by the 3GPP standard organization, is a communication protocol extended based on the 4G LTE standard, and is mainly used for vehicle-to-road and vehicle-to-vehicle wireless communication. At present, the technology is not widely applied, and the technology has small-scale pilot application in China, America, Europe and other countries and regions.
Defects of LTE-V: LTE-V supports two different communication modes (mode 3 and mode 4). In the mode 4, the wireless resources of the LTE-V terminal are acquired by competition of other LTE-V terminals, network congestion is likely to occur and minimum performance guarantee is lacked, so that the coverage area is limited and the large-scale application performance is unstable. In mode 3, the base station can manage and allocate radio resources required for LTE-V terminal communication, but this mode requires base station participation and is costly to deploy. In addition, the LTE-V terminal itself is also expensive and difficult to be applied on a large scale.
In summary, in the related art, it is necessary to realize stable and reliable communication between the roadside facility and the vehicle at a cost saving.
Disclosure of Invention
The embodiment of the application provides a communication method and equipment for vehicle-road cooperation, and aims to solve the problem that stable and reliable communication between road side facilities and vehicles cannot be achieved under the condition of saving cost in the related art.
In a first aspect, an embodiment of the present application provides a communication method for vehicle-road coordination, where the method includes:
broadcasting time slot management information to vehicle-mounted equipment in a communication area of the road side equipment by the road side equipment in a first time slot of a wireless frame, wherein the time slot management information comprises time slot distribution information and time slot distribution information;
the time slot distribution information is used for describing the distribution condition of various time slots of the wireless frame, the time slot distribution information is used for indicating target equipment and a modulation and coding mode of the target equipment, which correspond to each time slot respectively, and the target equipment comprises road side equipment and vehicle-mounted equipment;
and the road side equipment and the vehicle-mounted equipment respectively send time slot information in corresponding time slots of the wireless frame based on the time slot management information, and the time slot information is used for communication between the road side equipment and the vehicle-mounted equipment.
Further, the radio frame includes the following four types of slots that appear in sequence: the wireless frame comprises a frame management time slot, a downlink packet data time slot, an uplink packet data time slot and a random access time slot, wherein the time lengths corresponding to the time slots in the wireless frame are the same.
Further, the method for transmitting the time slot information in the wireless frame by the road side device and the vehicle-mounted device based on the time slot management information includes:
the method comprises the steps that the road side equipment sends downlink time slot information to corresponding vehicle-mounted equipment in a downlink packet data time slot corresponding to the vehicle-mounted equipment, and the downlink time slot information is obtained by coding data to be transmitted in a modulation coding mode corresponding to the downlink packet data time slot;
the vehicle-mounted equipment sends uplink time slot information to the roadside equipment at the corresponding uplink packet data time slot, and the uplink time slot information is obtained by coding data to be transmitted in a modulation coding mode corresponding to the uplink packet data time slot;
the time slot information includes downlink time slot information and uplink time slot information.
Further, the method for transmitting the time slot information in the wireless frame by the road side device and the vehicle-mounted device based on the time slot management information includes:
and broadcasting or multicasting downlink time slot information to vehicle-mounted equipment in a communication area of the road side equipment by the road side equipment at the corresponding downlink packet data time slot, wherein the downlink time slot information is obtained by coding the data to be transmitted in a modulation coding mode corresponding to the downlink packet data time slot.
Further, if the timeslot management information indicates that the random access timeslot has a plurality of random access channels, the roadside device and the vehicle-mounted device each send timeslot information in a corresponding timeslot of the wireless frame based on the timeslot management information, including:
the target vehicle-mounted equipment sends time slot request information for requesting resource time slots to the road side equipment in any random access channel of the random access time slots;
the resource time slot comprises at least one of a downlink packet data time slot and an uplink packet data time slot, the target vehicle-mounted equipment is the vehicle-mounted equipment which is not allocated with the resource time slot in the communication area of the road side equipment, and the time slot information comprises time slot request information.
Further, the multiple random access channels of the random access time slot are multiple parallel transmission channels, the structure of the time slot information corresponding to each random access channel is the same, and the time slot information corresponding to each random access channel includes at least one of the following: the method comprises the steps of area identification of a communication area where the vehicle-mounted equipment is located, priority information, service type information and expected modulation and coding mode information.
Further, the structure of the timeslot information corresponding to the downlink packet data timeslot and the uplink packet data timeslot is the same, and the timeslot information corresponding to the downlink packet data timeslot or the uplink packet data timeslot includes at least one of the following: communication data, data direction information, data type information, data length information and data transmitting power;
wherein, the data transmission direction indicated by the data direction information comprises: the data type indicated by the data type information in the uplink direction and the downlink direction comprises the following data types: command type, response type.
Further, the timeslot management information further includes at least one of: the method comprises the steps of identifying the area of a communication area where the road side equipment is located, service type information and power configuration information;
the service type information is used for indicating the service type supported by the current communication, and the power configuration information is used for indicating the signal receiving power or the signal transmitting power respectively corresponding to each type of time slot.
In a second aspect, an embodiment of the present application provides a roadside apparatus, including:
the radio frequency transceiver is used for broadcasting time slot management information to vehicle-mounted equipment in a communication area at a first time slot of a wireless frame, sending time slot information to the vehicle-mounted equipment at a corresponding time slot of road-side equipment, and receiving the time slot information sent by the vehicle-mounted equipment at a corresponding time slot of the vehicle-mounted equipment, wherein the time slot management information comprises time slot distribution information and time slot distribution information, the time slot distribution information is used for describing distribution conditions of various time slots of the wireless frame, the time slot distribution information is used for indicating modulation and coding modes of target equipment and target equipment corresponding to the time slots respectively, the target equipment comprises the road-side equipment and the vehicle-mounted equipment, and the time slot information is used for communication between the road-side equipment and the vehicle-mounted equipment;
and the processor is used for determining the corresponding time slot of the road side equipment in the wireless frame and determining the corresponding time slot of the vehicle-mounted equipment in the wireless frame based on the time slot management information.
In a third aspect, an embodiment of the present application provides an on-vehicle device, including:
the radio frequency transceiver is used for receiving time slot management information broadcasted by the road side equipment at a first time slot of a wireless frame, receiving time slot information sent by the road side equipment at a corresponding time slot shared by the road side equipment and the vehicle-mounted equipment, and sending the time slot information to the road side equipment at a corresponding time slot of the vehicle-mounted equipment, wherein the time slot management information comprises time slot distribution information and time slot distribution information, the time slot distribution information is used for describing distribution conditions of various time slots of the wireless frame, the time slot distribution information is used for indicating a target equipment and a modulation coding mode of the target equipment, which correspond to each time slot, respectively, the target equipment comprises the road side equipment and the vehicle-mounted equipment, and the time slot information is used for communication between the road side equipment and the vehicle-mounted equipment;
and the processor is used for determining the corresponding time slot of the road side equipment in the wireless frame and determining the corresponding time slot of the vehicle-mounted equipment in the wireless frame based on the time slot management information.
Compared with the related technology, the embodiment of the application has the beneficial effects that: the vehicle-mounted equipment distributes time slots for communicating with the road side equipment through the wireless frames, the vehicle-mounted equipment and the road side equipment can send time slot information at respective corresponding time slots, so that the vehicle-mounted equipment can send data to the road side equipment in order or receive data from the road side equipment, the vehicle-mounted equipment and the road side equipment are communicated in order, network congestion caused by competition of a plurality of road side equipment for network resources of the vehicle-mounted equipment can be avoided, and stable and reliable communication between the vehicle-mounted equipment and the road side equipment in a communication area of the vehicle-mounted equipment and the vehicle-mounted equipment is facilitated. In addition, the road side equipment broadcasts the time slots and the modulation and coding modes distributed by the vehicle-mounted equipment to each vehicle-mounted equipment through the first time slot of the wireless frame, so that the road side equipment can communicate with various types of vehicle-mounted equipment adopting different modulation and coding modes, the communication mode is more flexible, and the stability of communication between the vehicle-mounted equipment and the road side equipment is further improved. In addition, the cost of the roadside equipment is much lower than that of the base station, which contributes to cost saving.
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 flowchart of a communication method for vehicle-road coordination according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a radio frame according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a random access slot according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of timeslot information corresponding to a random access channel according to an embodiment of the present application;
fig. 5 is a diagram illustrating a data structure of timeslot information corresponding to a packet data timeslot according to another embodiment of the present application;
fig. 6 is a schematic data structure diagram of timeslot management information according to an embodiment of the present application;
fig. 7 is a timing diagram of the broadcast data of the roadside device in the downlink packet data slot according to an embodiment of the present application;
fig. 8 is a timing diagram of the roadside device transmitting communication data in downlink packet data slots according to an embodiment of the present application;
fig. 9 is a timing chart of transmitting communication data by the vehicle-mounted device in the communication process according to an embodiment of the present application;
FIG. 10 is a schematic structural diagram of a roadside apparatus provided in an embodiment of the present application;
fig. 11 is a schematic structural diagram of an in-vehicle 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 for vehicle-road coordination, including:
step 101, the road side device broadcasts time slot management information to the vehicle-mounted devices in the communication area of the road side device in the first time slot of the wireless frame.
The time slot management information includes time slot distribution information and time slot allocation information. The communication area is generally referred to as a signal coverage area. Every two adjacent time slots are consecutive in time.
The time slot distribution information is used for describing the distribution condition of various time slots of the wireless frame, the time slot distribution information is used for indicating target equipment and a modulation and coding mode of the target equipment, which correspond to each time slot, and the target equipment comprises road side equipment and vehicle-mounted equipment.
For example, if there are 3 types of slots, the slot distribution information may indicate: there are 1 slot of the first type, 1 slot of the second type and 2 slots of the third type. And the slot allocation information may indicate: the vehicle-mounted device corresponding to the 2 nd time slot is device 1, the modulation and coding scheme of the device 1 is M1, the vehicle-mounted device corresponding to the 3 rd time slot is device 1, the modulation and coding scheme of the device 1 is M1, and the vehicle-mounted device corresponding to the 4 th time slot is device 2, and the modulation and coding scheme of the device 2 is M2. In this example, the first type of time slot may be a time slot for the road side device to manage each time slot of the wireless frame, the second type of time slot may be a time slot for the road side device to send data to the vehicle mounted device, and the third type of time slot may be a time slot for the vehicle mounted device to send data to the road side device.
Here, a plurality of types of slots may be included in each radio frame, and the number of each type of slot may be one or more. The road side device may broadcast the slot management information to all vehicle-mounted devices in the communication area of the road side device in the first slot of the wireless frame.
And 102, the road side equipment and the vehicle-mounted equipment respectively send time slot information in corresponding time slots of the wireless frame based on the time slot management information, and the time slot information is used for communication between the road side equipment and the vehicle-mounted equipment.
Here, each vehicle-mounted device in the communication area of the roadside device may receive the timeslot management information broadcast by the roadside device through the first timeslot. Then, each vehicle-mounted device can transmit the time slot information obtained by coding in the corresponding modulation coding mode in the corresponding time slot according to the indication of the time slot management information.
In the method provided by this embodiment, the vehicle-mounted device allocates, to the vehicle-mounted device, a time slot for communicating with the roadside device through the wireless frame, and the vehicle-mounted device and the roadside device may transmit time slot information at respective corresponding time slots, so that the vehicle-mounted device may sequentially transmit data to the roadside device or receive data from the roadside device, thereby achieving sequential communication between the vehicle-mounted device and the roadside device, avoiding a network congestion situation caused by competition of multiple roadside devices for a network resource of the vehicle-mounted device, and facilitating stable and reliable communication between the vehicle-mounted device and the roadside device in a communication area of the vehicle-mounted device. In addition, the road side equipment broadcasts the time slots and the modulation and coding modes distributed by the vehicle-mounted equipment to each vehicle-mounted equipment through the first time slot of the wireless frame, so that the road side equipment can communicate with various types of vehicle-mounted equipment adopting different modulation and coding modes, the communication mode is more flexible, and the stability of communication between the vehicle-mounted equipment and the road side equipment is further improved.
It is noted that the data link layer can be divided into 2 sub-layers: a Media Access Control (MAC) sublayer and a Logical Link Control (LLC) sublayer. The MAC sublayer is mainly responsible for radio resource allocation and the LLC sublayer is mainly responsible for logical link management and error retransmission. The allocation of radio resources by the MAC sublayer is based on the management of radio frames. One wireless frame can realize one-time allocation of wireless resources of the roadside device, which can be understood as a communication back and forth between the roadside device and the vehicle-mounted device. The two adjacent radio frames may be continuous in time or discontinuous.
In practical application, the roadside device may determine whether to start a new wireless frame according to a network deployment situation, a relevant configuration, and the like. For example, the roadside device may continuously turn on a new radio frame according to the configuration, or discontinuously turn on a new radio frame every configured time period.
In an optional implementation manner of various embodiments of the present application, the radio frame may include the following four types of slots that occur in sequence: a Frame Management Slot (FMS), a downlink packet Data Slot (DL-PDS), an uplink packet Data Slot (UL-PDS), and a Random Access Slot (RAS). The time lengths corresponding to the time slots in the radio frame are the same.
Wherein FMS, DL-PDS, UL-PDS, and RAS in a radio frame are consecutive in time. The FMS is the first slot of a radio frame. The FMS is generally a time slot for the roadside device to manage each time slot of the wireless frame, the DL-PDS is generally a time slot for the roadside device to transmit data to the vehicle-mounted device, and the UL-PDS is generally a time slot for the vehicle-mounted device to transmit data to the roadside device. The RAS is generally a time slot for the in-vehicle device to transmit time slot request information for requesting a resource time slot to the roadside device. The RAS is typically located at the end of a radio frame.
Here, there is usually only one FMS in each radio frame, there may be a first number of DL-PDSs, there may be a second number of UL-PDSs, and the first number and the second number may be the same or different. In a radio frame, there may be one RAS, or there may be multiple RAS, or there may not be RAS, and the specific number of RAS is usually allocated and implemented by the roadside device through the timeslot management information.
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 roadside device in combination with the preset allocation rule and the actual communication scenario requirement.
In practical applications, after the road side device broadcasts the timeslot management information in the FMS of the wireless frame, the vehicle-mounted device may determine one or more DL-PDSs and/or one or more UL-PDSs allocated to the vehicle-mounted device according to the timeslot management information. In this way, the vehicle-mounted device can receive the time slot information from the roadside device in each DL-PDS, and can transmit the time slot information to the roadside device in each UL-PDS. It should be noted that if there are a plurality of UL-PDS allocated to a certain vehicle-mounted device, the plurality of UL-PDS are a plurality of temporally consecutive UL-PDS, and if there are a plurality of DL-PDS allocated to a certain vehicle-mounted device, the plurality of DL-PDS are a plurality of temporally consecutive DL-PDS.
Note that the RAS in the radio frame may allocate time slots to the vehicle-mounted devices that are not allocated time slots as needed. The road side equipment actively allocates the time slot and requests the vehicle-mounted equipment to allocate the time slot, and the coexistence of the two allocation modes is beneficial to the road side equipment to allocate the time slot to the vehicle-mounted equipment more flexibly, so that the communication stability between the vehicle-mounted equipment and the road side equipment is further improved. In addition, each time slot has a fixed time length, so that the roadside equipment and the vehicle-mounted equipment can conveniently acquire accurate time slot positions.
Fig. 2 is a schematic structural diagram of a radio frame according to an embodiment of the present application. In fig. 2, 1 radio frame may include a plurality of time slots, which are sequentially appeared and are consecutive in time, i.e., 1 FSM, m DL-PDS, n UL-PDS, and k RAS.
In some optional implementation manners, the sending, by the roadside device and the vehicle-mounted device, the slot information in a corresponding slot of the wireless frame based on the slot management information may include:
and the road side equipment sends downlink time slot information to corresponding vehicle-mounted equipment at the DL-PDS corresponding to the vehicle-mounted equipment, wherein the downlink time slot information is obtained by coding the data to be transmitted in a modulation coding mode corresponding to the DL-PDS.
And the vehicle-mounted equipment sends uplink time slot information to the roadside equipment at the corresponding UL-PDS, wherein the uplink time slot information is obtained by coding the data to be transmitted in a modulation coding mode corresponding to the UL-PDS.
The time slot information comprises downlink time slot information and uplink time slot information.
Here, the roadside device may transmit the downlink slot information to the vehicle-mounted device at the DL-PDS of the vehicle-mounted device. And the vehicle-mounted equipment can send the uplink time slot information to the roadside equipment in the UL-PDS of the vehicle-mounted equipment. Therefore, orderly communication between the road side equipment and the vehicle-mounted equipment can be realized. In addition, different modulation and coding modes can be adopted for the time slot information of the same vehicle-mounted device at different moments, and different modulation and coding modes can be adopted for different vehicle-mounted devices by the road-side device, so that the stability and flexibility of communication between the vehicle-mounted device and the road-side device are improved.
In some optional implementation manners, the sending, by the roadside device and the vehicle-mounted device, the slot information in a corresponding slot of the wireless frame based on the slot management information includes:
and the roadside equipment broadcasts or multicasts downlink time slot information to vehicle-mounted equipment in a communication area of the roadside equipment in the corresponding DL-PDS, wherein the downlink time slot information is obtained by coding the data to be transmitted in a modulation coding mode corresponding to the DL-PDS.
Here, the roadside device may send the downlink timeslot information to the vehicle-mounted device in a broadcast manner or a multicast manner in the DL-PDS of the roadside device, and may improve communication efficiency between the roadside device and the vehicle-mounted device.
In some optional implementations, if the timeslot management information indicates that the RAS has multiple Random Access Channels (RAC), the roadside device and the vehicle-mounted device each send timeslot information in a corresponding timeslot of a radio frame based on the timeslot management information, including: and the target vehicle-mounted equipment sends time slot request information for requesting resource time slots to the road-side equipment in any RAC of the RAS.
The resource time slot comprises at least one of DL-PDS and UL-PDS, the target vehicle-mounted equipment is the vehicle-mounted equipment which is not allocated with the resource time slot in the communication area of the road side equipment, and the time slot information comprises time slot request information.
Here, the target in-vehicle device may transmit the time slot request information to the roadside device in any one of the RACs when the time slot management information indicates that the RAS has the plurality of RACs after receiving the time slot management information.
In practical applications, after the vehicle-mounted device enters the communication area of the roadside device and before the vehicle-mounted device is allocated with the resource time slot for the first time, the vehicle-mounted device may request allocation of the resource time slot through the RAS. After the vehicle-mounted device is allocated with the resource time slot, the vehicle-mounted device can actively communicate with the roadside device through the resource time slot. After the vehicle-mounted device is allocated with the resource time slot, the roadside device may dynamically allocate the resource time slot to the vehicle-mounted device in the subsequent wireless frame based on the communication requirement of the vehicle-mounted device.
Fig. 3 is a schematic structural diagram of a random access slot according to an embodiment of the present application. In fig. 3, the RAS may have N RACs.
In the foregoing implementation manner, the plurality of RACs of the RAS are a plurality of parallel transmission channels, the time slot information corresponding to each RAC has the same structure, and the time slot information corresponding to each RAC includes at least one of the following: the method comprises the steps of area identification of a communication area where the vehicle-mounted equipment is located, priority information, service type information and expected modulation and coding mode information.
Here, when requesting the resource timeslot from the roadside device, the vehicle-mounted device may simultaneously transmit the traffic type information and the expected modulation and coding scheme information to the roadside device, so that the roadside device may perform docking communication in the next radio frame in the modulation and coding scheme expected by the vehicle-mounted device. Which helps to improve communication flexibility.
Fig. 4 is a schematic structural diagram of timeslot information corresponding to a random access channel according to an embodiment of the present application. As shown in fig. 4, the timeslot information corresponding to the RAC may include: short PR, long PR, CM, LID, LRI, CRC, PAD.
Wherein, short PR is a short sequence code, long PR is a long sequence code, CM is a communication area identifier for indicating a communication area where the vehicle-mounted device is located, LID is a link layer identifier of the vehicle-mounted device, LRI is information for indicating a priority of a resource request, a service type of the request, an expected modulation coding mode, and the like, CRC is a cyclic redundancy code, and PAD is a padding bit.
In the present application, the CRC is used to detect whether data causes errors during transmission. The PAD is used for data padding, and is usually added after the data when the data length does not satisfy an integer multiple of the minimum length.
In an optional implementation manner of various embodiments of the present application, the structures of the timeslot information corresponding to the DL-PDS and the UL-PDS are the same, and the timeslot information corresponding to the DL-PDS or the UL-PDS includes at least one of the following: communication data, data direction information, data type information, data length information and data transmitting power.
Wherein, the data transmission direction indicated by the data direction information comprises: the data type indicated by the data type information in the uplink direction and the downlink direction comprises the following data types: command type, response type.
Fig. 5 is a diagram illustrating a data structure of timeslot information corresponding to a packet data timeslot according to an embodiment of the present application. The packet data slots include UL-PDS and DL-PDS. As shown in fig. 5, the time slot information corresponding to the PDS may include: short PR, long PR, MAC, LPDU, CRC, PAD.
Wherein short PR is short sequence code, long PR is long sequence code. The MAC part is a data header of a MAC sublayer in the PDS, and at least comprises the following information: data transmission direction (uplink or downlink), data type (command or response), data length of LPDU, data transmission power of PDS. The LPDU portion is a packet data unit of the LLC sublayer. CRC is the cyclic redundancy code and PAD is the padding bits.
In an optional implementation manner of various embodiments of the present application, the timeslot management information further includes at least one of the following: the method comprises the steps of area identification of a communication area where the road side equipment is located, service type information and power configuration information.
The service type information is used for indicating the service type supported by the current communication, and the power configuration information is used for indicating the signal receiving power or the signal transmitting power respectively corresponding to each type of time slot.
Fig. 6 is a schematic data structure diagram of timeslot management information according to an embodiment of the present application. As shown in fig. 6, the slot management information may include: short PR, long PR, SIG, CM, FRI, FP, MP, AP, SRV, SCI, CRC, PAD.
Wherein short PR is short sequence code, long PR is long sequence code. CRC is the cyclic redundancy code and PAD is the padding bits.
SIG contains at least the following information: FMS information version number, carrier information of the current communication domain (e.g., 5MHz carrier, 10MHz carrier, etc.), and a coverage type of the current communication domain (e.g., long-distance coverage or short-distance coverage).
The CM is an identifier of a current communication domain and is used for indicating a communication area where the road side equipment is located.
The FRI is time slot structure information of the current wireless frame, can describe distribution conditions of various time slots of the wireless frame, and is used for the vehicle-mounted equipment to obtain the quantity ratio of the various time slots.
FP is used to indicate the corresponding transmit power of the FMS.
The MP is used to indicate the target received power corresponding to the PDS.
The AP is used for indicating the target receiving power corresponding to the RAS.
The SRV is used to indicate the service types supported by the current communication domain.
The SCI is used to indicate a target device and a modulation and coding scheme of the target device corresponding to each timeslot. Each radio frame carries multiple SCIs.
As shown in fig. 6, the slot management information may include M SCIs, each SCI including a CI part indicating a physical layer coding modulation scheme used for data transmission of the slot and an LID part indicating a link layer identifier of a device assigned to the corresponding slot.
Here, after the vehicle-mounted device receives the timeslot management information, it can learn the timeslot allocated for the roadside device broadcast information transmission, the timeslot used for the uplink data transmission of the vehicle-mounted device, and the timeslot used for the downlink data transmission of the vehicle-mounted device.
Fig. 7 is a timing diagram of the road side device broadcasting data in the downlink packet data slot according to the embodiment of the present application. The method for the roadside device to broadcast the data in the DL-PDS can be realized by the following steps:
in step 701, the roadside device sends PDS slot information of the broadcast data in the FMS.
Here, the roadside device transmits, at the FMS, time slot management information in which a DL-PDS time slot for the roadside device to transmit broadcast data to the vehicle-mounted device in the form of a broadcast is allocated to the roadside device in the time slot allocation information of the time slot management information.
In step 702, the vehicle-mounted device acquires the PDS time slot information of the broadcast data.
Here, each vehicle-mounted device in the communication area of the roadside device may receive the timeslot management information transmitted by the roadside device in the FMS, so as to acquire information such as the position of the DL-PDS timeslot where the broadcast data is located and the corresponding modulation and coding scheme.
In step 703, the roadside device transmits the broadcast data in the specified PDS time slot.
Here, the roadside device transmits the broadcast data to the vehicle-mounted device in the DL-PDS slot allocated to the roadside device for transmitting the broadcast data.
In step 704, the vehicle-mounted device acquires broadcast data.
Here, the in-vehicle device may receive broadcast data broadcast by the roadside device.
Fig. 8 is a timing diagram of the roadside device transmitting communication data in a downlink packet data slot according to the embodiment of the present application. The method for the roadside device to send the unicast data in the DL-PDS can be realized by the following steps:
in step 801, the roadside device indicates the PDS slot for the unicast data at the FMS via the SCI.
Here, the roadside device transmits, at the FMS, slot management information whose slot allocation information indicates that the vehicle-mounted device is allocated with a DL-PDS for the roadside device to transmit unicast data to the vehicle-mounted device.
Step 802, the vehicle-mounted equipment acquires a PDS time slot position.
Here, the vehicle-mounted device may receive the timeslot management information sent by the roadside device in the FMS, so as to obtain the DL-PDS and the timeslot position of the vehicle-mounted device. The time slot position of the DL-PDS is acquired by the vehicle-mounted equipment, so that the vehicle-mounted equipment can accurately monitor unicast data.
In step 803, the roadside device transmits unicast data at the designated PDS.
Here, the roadside device transmits unicast data to the vehicle-mounted device at the DL-PDS allocated to the vehicle-mounted device.
And step 804, the vehicle-mounted equipment sends the response and the data.
Here, the vehicle-mounted device may transmit a response and data to the roadside device at the UL-PDS allocated to the vehicle-mounted device.
Fig. 9 is a timing chart of transmitting communication data by the vehicle-mounted device in the communication process according to the embodiment of the present application. As shown in fig. 9, the sending of the communication data by the vehicle-mounted device during the communication process can be realized by the following steps:
in step 901, the roadside device indicates a time slot structure of a radio frame through FRI in the FMS.
Here, the FRI is slot distribution information included in the slot management information. The slot structure of a radio frame generally refers to the number and distribution of various types of slots of the radio frame.
Step 902, the vehicle-mounted device acquires a RAS time slot structure.
Here, the RAS time slot structure generally refers to the number of RACs in the RAS. The vehicle-mounted equipment can receive the time slot management information, so that RAS time slot structure information in the wireless frame is obtained through processing.
Step 903, the vehicle-mounted device randomly selects an RAC channel and sends an access request.
Here, the access request is the slot request information for requesting the resource slot. The vehicle-mounted device may send an access request to the roadside device from any RAC channel.
In step 904, the roadside device allocates a PDS slot to the vehicle-mounted device through the SCI in the FMS.
Here, the roadside device may allocate a PDS slot to the corresponding vehicle-mounted device based on the access request sent by the vehicle-mounted device in the last radio frame. The allocated PDS slots may include UL-PDS and/or DL-PDS.
Step 905, the vehicle-mounted device acquires a PDS time slot position.
Here, the vehicle-mounted device may receive the timeslot management information sent by the roadside device in the FMS, so as to obtain the UL-PDS and the timeslot position of the vehicle-mounted device.
In step 906, the in-vehicle device transmits the communication data in the designated PDS slot.
Here, the vehicle-mounted device transmits communication data to the roadside device at the UL-PDS allocated to the vehicle-mounted device.
At step 907, the roadside device transmits the response and the data.
Here, the roadside device may transmit a response and data to the in-vehicle device for the DL-PDS of the in-vehicle device in the next wireless frame.
With continued reference to fig. 10, embodiments of the present application further provide a roadside apparatus including a radio frequency transceiver 1001 and a processor 1002, wherein,
the radio frequency transceiver 1001 is used for broadcasting time slot management information to vehicle-mounted equipment in a communication area at a first time slot of a wireless frame, sending time slot information to the vehicle-mounted equipment at a corresponding time slot of road-side equipment, and receiving the time slot information sent by the vehicle-mounted equipment at a corresponding time slot of the vehicle-mounted equipment, wherein the time slot management information comprises time slot distribution information and time slot allocation information, the time slot distribution information is used for describing distribution conditions of various time slots of the wireless frame, the time slot allocation information is used for indicating a target equipment and a modulation and coding mode of the target equipment, which correspond to each time slot, respectively, the target equipment comprises the road-side equipment and the vehicle-mounted equipment, and the time slot information is used for communication between the road-side equipment and the vehicle-mounted equipment;
the processor 1002 is configured to determine, based on the timeslot management information, a corresponding timeslot of the roadside device in the wireless frame, and a corresponding timeslot of the vehicle-mounted device in the wireless frame.
With continuing reference to fig. 11, embodiments of the present application further provide an in-vehicle device, including a radio frequency transceiver 1101 and a processor 1102, wherein,
the radio frequency transceiver 1101 is used for receiving time slot management information broadcasted by the road side device at a first time slot of a wireless frame, receiving time slot information sent by the road side device at a corresponding time slot shared by the road side device and the vehicle-mounted device, and sending time slot information to the road side device at a corresponding time slot of the vehicle-mounted device, wherein the time slot management information comprises time slot distribution information and time slot allocation information, the time slot distribution information is used for describing distribution conditions of various time slots of the wireless frame, the time slot allocation information is used for indicating a target device and a modulation and coding mode of the target device, which correspond to each time slot, respectively, the target device comprises the road side device and the vehicle-mounted device, and the time slot information is used for communication between the road side device and the vehicle-mounted device;
and a processor 1102, configured to determine, based on the timeslot management information, a corresponding timeslot of the roadside device in the wireless frame, and a corresponding timeslot of the vehicle-mounted device in the wireless frame.
In the embodiment of the application, the vehicle-mounted device allocates the time slot for communicating with the road side device through the wireless frame, the vehicle-mounted device and the road side device can send the time slot information at respective corresponding time slots, so that the vehicle-mounted device can send data to the road side device in order or receive data from the road side device, the vehicle-mounted device and the road side device can communicate in order, network congestion caused by competition of multiple road side devices for network resources of the vehicle-mounted device can be avoided, and stable and reliable communication between the vehicle-mounted device and the road side device in a communication area of the vehicle-mounted device is facilitated. In addition, the road side equipment broadcasts the time slots and the modulation and coding modes distributed by the vehicle-mounted equipment to each vehicle-mounted equipment through the first time slot of the wireless frame, so that the road side equipment can communicate with various types of vehicle-mounted equipment adopting different modulation and coding modes, the communication mode is more flexible, and the stability of communication between the vehicle-mounted equipment and the road side equipment is further improved.
It should be noted that, because the contents of information interaction, execution process, and the like between the roadside device and the vehicle-mounted 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 (10)

1. A communication method for vehicle-road coordination, the method comprising:
the method comprises the steps that the road side equipment broadcasts time slot management information to vehicle-mounted equipment in a communication area of the road side equipment in a first time slot of a wireless frame, wherein the time slot management information comprises time slot distribution information and time slot distribution information;
the time slot distribution information is used for describing distribution conditions of various time slots of the wireless frame, the time slot distribution information is used for indicating target equipment and modulation and coding modes of the target equipment which correspond to the time slots respectively, and the target equipment comprises the road side equipment and the vehicle-mounted equipment;
and the road side equipment and the vehicle-mounted equipment respectively send time slot information in corresponding time slots of the wireless frames based on the time slot management information, and the time slot information is used for communication between the road side equipment and the vehicle-mounted equipment.
2. The communication method for vehicle-road coordination according to claim 1, wherein said wireless frame comprises the following four types of time slots in sequence: the wireless frame comprises a frame management time slot, a downlink packet data time slot, an uplink packet data time slot and a random access time slot, wherein the time lengths corresponding to the time slots in the wireless frame are the same.
3. The communication method for vehicle-road coordination according to claim 2, wherein the roadside device and the vehicle-mounted device each transmit time slot information in a corresponding time slot of the wireless frame based on the time slot management information, and the method comprises:
the road side equipment sends downlink time slot information to corresponding vehicle-mounted equipment in a downlink packet data time slot corresponding to the vehicle-mounted equipment, wherein the downlink time slot information is obtained by coding data to be transmitted in a modulation coding mode corresponding to the downlink packet data time slot;
the vehicle-mounted equipment sends uplink time slot information to the roadside equipment at the corresponding uplink packet data time slot, wherein the uplink time slot information is obtained by coding data to be transmitted in a modulation coding mode corresponding to the uplink packet data time slot;
the time slot information includes the downlink time slot information and the uplink time slot information.
4. The communication method for vehicle-road coordination according to claim 2, wherein the roadside device and the vehicle-mounted device each transmit time slot information in a corresponding time slot of the wireless frame based on the time slot management information, and the method comprises:
and the roadside equipment broadcasts or multicasts downlink time slot information to vehicle-mounted equipment in a communication area of the roadside equipment in the corresponding downlink packet data time slot, wherein the downlink time slot information is obtained by coding the data to be transmitted in a modulation coding mode corresponding to the downlink packet data time slot.
5. The communication method for vehicle-road cooperation according to claim 2, wherein if the timeslot management information indicates that the random access timeslot has multiple random access channels, the roadside device and the vehicle-mounted device each transmit timeslot information in a corresponding timeslot of the wireless frame based on the timeslot management information, including:
the target vehicle-mounted equipment sends time slot request information for requesting resource time slots to the roadside equipment in any random access channel of the random access time slots;
the resource time slot comprises at least one of a downlink packet data time slot and an uplink packet data time slot, the target vehicle-mounted device is a vehicle-mounted device which is not allocated with the resource time slot in a communication area of the road side device, and the time slot information comprises the time slot request information.
6. The communication method for vehicle-road cooperation according to claim 5, wherein the plurality of random access channels of the random access time slot are a plurality of parallel transmission channels, the time slot information corresponding to each random access channel has the same structure, and the time slot information corresponding to each random access channel includes at least one of: the method comprises the steps of area identification of a communication area where the vehicle-mounted equipment is located, priority information, service type information and expected modulation and coding mode information.
7. The communication method for vehicle-road coordination according to claim 2, wherein the structure of the timeslot information corresponding to the downlink packet data timeslot and the uplink packet data timeslot is the same, and the timeslot information corresponding to the downlink packet data timeslot or the uplink packet data timeslot includes at least one of the following: communication data, data direction information, data type information, data length information and data transmitting power;
wherein the data transmission direction indicated by the data direction information includes: the data type indicated by the data type information comprises the following data types: command type, response type.
8. The communication method for vehicle-road coordination according to any of claims 1-7, characterized in that said timeslot management information further comprises at least one of: the method comprises the steps of identifying the area of a communication area where the road side equipment is located, service type information and power configuration information;
the service type information is used for indicating the service type supported by the current communication, and the power configuration information is used for indicating the signal receiving power or the signal transmitting power respectively corresponding to each type of time slot.
9. A roadside apparatus characterized by comprising:
the radio frequency transceiver is used for broadcasting time slot management information to vehicle-mounted equipment in a communication area at a first time slot of a wireless frame, sending time slot information to the vehicle-mounted equipment at a corresponding time slot of the road side equipment, and receiving the time slot information sent by the vehicle-mounted equipment at a corresponding time slot of the vehicle-mounted equipment, wherein the time slot management information comprises time slot distribution information and time slot distribution information, the time slot distribution information is used for describing distribution conditions of various time slots of the wireless frame, the time slot distribution information is used for indicating target equipment and modulation and coding modes of the target equipment, which correspond to the time slots respectively, the target equipment comprises the road side equipment and the vehicle-mounted equipment, and the time slot information is used for communication between the road side equipment and the vehicle-mounted equipment;
and the processor is used for determining the corresponding time slot of the road side equipment in the wireless frame and determining the corresponding time slot of the vehicle-mounted equipment in the wireless frame based on the time slot management information.
10. An in-vehicle apparatus, characterized by comprising:
the radio frequency transceiver is used for receiving time slot management information broadcasted by road side equipment at a first time slot of a wireless frame, receiving time slot information sent by the road side equipment at a corresponding time slot shared by the road side equipment and the vehicle-mounted equipment, and sending time slot information to the road side equipment at a corresponding time slot of the vehicle-mounted equipment, wherein the time slot management information comprises time slot distribution information and time slot distribution information, the time slot distribution information is used for describing distribution conditions of various time slots of the wireless frame, the time slot distribution information is used for indicating a target equipment and a modulation and coding mode of the target equipment corresponding to each time slot, the target equipment comprises the road side equipment and the vehicle-mounted equipment, and the time slot information is used for communication between the road side equipment and the vehicle-mounted equipment;
and the processor is used for determining the corresponding time slot of the road side equipment in the wireless frame and determining the corresponding time slot of the vehicle-mounted equipment in the wireless frame based on the time slot management information.
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