WO2018058303A1 - Procédé, appareil et système d'accès à un réseau - Google Patents

Procédé, appareil et système d'accès à un réseau Download PDF

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Publication number
WO2018058303A1
WO2018058303A1 PCT/CN2016/100333 CN2016100333W WO2018058303A1 WO 2018058303 A1 WO2018058303 A1 WO 2018058303A1 CN 2016100333 W CN2016100333 W CN 2016100333W WO 2018058303 A1 WO2018058303 A1 WO 2018058303A1
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Prior art keywords
random access
rsu
obu
access preamble
preamble
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PCT/CN2016/100333
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English (en)
Chinese (zh)
Inventor
许辉
马子江
谢玉堂
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中兴通讯股份有限公司
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Priority to PCT/CN2016/100333 priority Critical patent/WO2018058303A1/fr
Publication of WO2018058303A1 publication Critical patent/WO2018058303A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • This document relates to, but is not limited to, mobile communication technologies, and more particularly to a method, apparatus and system for accessing a network.
  • the technologies to improve vehicle safety are mainly divided into passive safety technology and active safety technology.
  • Passive safety technology is used to protect people inside and outside the vehicle after accidents.
  • Active safety technology is used to prevent and reduce accidents in vehicles and avoid injuries.
  • Active safety technology is the focus of modern vehicle safety technology development. And trends.
  • the communication-based collision warning system realizes real-time information interaction between the vehicle, the vehicle and the roadside infrastructure by using advanced wireless communication technology and a new generation of information processing technology, and informs each other of the current state (including the position and speed of the vehicle). Acceleration, driving route) and learned road environment information, collaboratively aware of road hazard conditions, timely providing a variety of collision warning information to prevent road traffic safety accidents, and become a new way for countries to solve road traffic safety problems. .
  • FIG. 1 is a schematic diagram of sending traffic and scheduling information to a vehicle through a network information platform.
  • LTE Long Term Evolution
  • the Road Side Unit can receive vehicle requests, ensure that the vehicle accesses the Internet, and has the function of a gateway. In addition, it also has the functions of data calculation, storage, and forwarding.
  • V2R vehicle to road side unit
  • V2I Vehicle to Infrastructure
  • the main features of V2R communication include: (1) When RSU broadcasts, broadcast information is only sent to all vehicles in its coverage; (2) Single-hop transmission between RSU and vehicle prevents packet transmission from multi-hop transmission. The low rate, low network throughput and other adverse effects; (3) RSU can quickly receive the detected passing vehicles, traffic lights and some road condition information, and process, reorder, filter and then send the information to the vehicle.
  • the above three aspects ensure that when the vehicle passes through the RSU, the connection with the RSU ensures that the vehicle can access the Internet reliably or in real time or download data stored by the RSU.
  • RSU has short-range coverage (hundreds of meters), cheap, easy to deploy, and high data access speed (about l0Mbps), but the following problems exist when the On Board Unit (OBU) is connected to the RSU in the related V2R communication. :
  • the RSU deployment has no unified management, RSU bandwidth, and limited channel resources. This leads to uneven distribution of RSUs and unordered contention behavior of vehicles in order to obtain more bandwidth and channel resources. For example, when there is an overlapping area between multiple RSUs in an urban scenario, if the vehicle accesses the RSU policy improperly, the load between the RSUs will be unbalanced and the network resource utilization will be reduced.
  • the embodiments of the present invention provide a method, an apparatus, and a system for accessing a network, which can avoid the problem that the vehicle generates disordered competition for obtaining bandwidth and channel resources due to uneven distribution of RSUs.
  • An embodiment of the present invention provides a method for accessing a network, where the method includes:
  • the onboard unit OBU receives the random access parameter sent by the roadside unit RSU;
  • the access parameters of the access channel include: a time-frequency resource of the access channel and a random access preamble, where the time-frequency resource of the access channel is used to carry the random access preamble sent by the OBU when accessing the RSU,
  • the random access preamble includes a non-contention random access preamble and a contention random access preamble;
  • the non-contention random access preamble and the time-frequency resources of the access channel are used for non-contention random access; wherein, the access station is required
  • the RSU business includes: high priority services and/or general services.
  • the method further includes:
  • the contention random access preamble and the time-frequency resources of the access channel are used for contention random access.
  • the random access parameter sent by the onboard unit OBU to receive the roadside unit RSU includes:
  • the OBU receives the RRC signaling sent by the RSU, where the RRC signaling includes the random access parameter.
  • RRC Radio Resource Control
  • the random access parameter sent by the onboard unit OBU to receive the roadside unit RSU includes:
  • the OBU receives a broadcast message sent by the RSU, where the broadcast message includes the random access parameter.
  • the embodiment of the present invention further provides another method for accessing a network, where the method includes:
  • the roadside unit RSU determines a random access parameter, where the random access parameter includes: a time-frequency resource of the access channel and a random access preamble, and the time-frequency resource of the access channel is used to carry the OBU at the access station.
  • the random access preamble sent by the RSU where the random access preamble includes a non-contention random access preamble and a contention random access preamble;
  • the roadside unit RSU transmits the random access parameter to all the onboard units OBU in the coverage area;
  • the random access parameter includes: a time-frequency resource of the access channel and a random access preamble, where the time-frequency resource of the access channel is used to carry the random access sent by the OBU when accessing the RSU Preamble, the random access preamble includes non-contention random access preamble and pre-competition random access guide.
  • the sending, by the roadside unit RSU, the random access parameters to all the onboard units OBUs in the coverage area includes:
  • the RSU When the OBU is in the radio resource control RRC connection mode, the RSU sends RRC signaling to the OBU, where the RRC signaling includes the random access parameter.
  • the sending, by the roadside unit RSU, the random access parameters to all the onboard units OBUs in the coverage area includes:
  • the RSU When the OBU is in an idle mode, the RSU sends a broadcast message to the OBU, where the broadcast message includes the random access parameter.
  • An embodiment of the present invention provides a user equipment, where the user equipment includes:
  • a receiving unit configured to receive a random access parameter sent by the roadside unit RSU, where the random access parameter includes: a time-frequency resource of the access channel and a random access preamble, where the time-frequency resource of the access channel is used And the random access preamble that is sent by the user equipment when accessing the RSU, where the random access preamble includes a non-contention random access preamble and a contention random access preamble;
  • An access unit configured to use the non-contention random access preamble and the time-frequency resources of the access channel to perform non-contention random access when the user equipment has a high priority service to access the RSU
  • the service that needs to access the RSU includes: a high priority service and/or a normal service.
  • the access unit is further configured to:
  • the contention frequency random access preamble and the time-frequency resources of the access channel are used for contention random access.
  • the receiving unit is configured to:
  • the RRC signaling sent by the RSU is received, where the RRC signaling includes the random access parameter.
  • the receiving unit is configured to:
  • the user equipment If the user equipment is in an idle mode, receiving a broadcast message sent by the RSU, where the broadcast message includes the random access parameter.
  • An embodiment of the present invention provides a base station, where the base station includes:
  • a determining unit configured to determine a random access parameter, where the random access parameter includes: a time-frequency resource of the access channel and a random access preamble, where the time-frequency resource of the access channel is used to carry the OBU in the access
  • the random access preamble sent by the RSU where the random access preamble includes a non-contention random access preamble and a contention random access preamble;
  • the sending unit is configured to send the random access parameter to all onboard units OBU in the coverage area.
  • the sending unit is configured to:
  • the RRC signaling is sent to the OBU, where the RRC signaling includes the random access parameter.
  • the sending unit is configured to:
  • a broadcast message is sent to the OBU, where the random access parameter is included in the broadcast message.
  • An embodiment of the present invention further provides an access system, where the system includes a user equipment and a base station as described above.
  • the OBU receives a random access parameter sent by the RSU, where the random access parameter includes: a time-frequency resource of the access channel and a random access preamble
  • the time-frequency resource of the access channel is used to carry the random access preamble sent by the OBU when accessing the RSU, and the random access preamble includes a non-contention random access preamble and a contention random access preamble, when the OBU has a high priority
  • the non-contention random access preamble and the time-frequency resources of the access channel are used for non-contention random access; wherein the service that needs to access the RSU includes: high priority Level business and / or general business.
  • FIG. 1 is a schematic diagram of sending traffic and scheduling information to a vehicle through a network information platform
  • FIG. 2 is a schematic flowchart of a method for accessing a network according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart diagram of another method for accessing a network according to an embodiment of the present disclosure
  • FIG. 4 is a schematic flowchart diagram of Embodiment 1 according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic flowchart of Embodiment 2 according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic flowchart of Embodiment 3 according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of a user equipment according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a base station according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of an access system according to an embodiment of the present invention.
  • the in-vehicle unit OBU in the embodiment of the present invention is disposed in the user equipment UE, and the roadside unit RSU is disposed in the base station, wherein the user equipment includes a terminal such as a handheld terminal, a tablet computer, a smart phone, a personal PC, and the base station includes a base station of the LTE system. .
  • An embodiment of the present invention provides a method for accessing a network. Based on the OBU side, as shown in FIG. 2, the method includes:
  • Step 101 The OBU receives the random access parameter sent by the RSU, where the random access parameter includes: a time-frequency resource of the access channel and a random access preamble, and the time-frequency resource of the access channel is used to carry the OBU when accessing the RSU.
  • the random access preamble is sent, and the random access preamble includes a non-contention random access preamble and a contention random access preamble.
  • the non-contention random access preamble or the contention random access preamble refers to a digital sequence of a certain length, and the RSU may divide the random access preamble into a competitive random access preamble and a non-contention random access according to a pre-defined rule.
  • the services that the OBU needs to access the RSU include: high Priority service or common service, non-competitive random access preamble for high priority services, such as car accident information, road emergency information, etc.; competitive random access preamble for ordinary services, such as surrounding hotel information, gas station information.
  • step 101 the OBU receives the random access parameter sent by the RSU, and the method includes:
  • the OBU receives the RRC signaling sent by the RSU, and the RRC signaling includes a random access parameter.
  • the RSU sends the random access parameter by using the RRC signaling.
  • the RSU is switched from the current RSU to the other RSU or the OBU to the RSU.
  • the non-contention random access preamble and the time-frequency resource of the access channel are directly directly transmitted by using RRC signaling.
  • step 101 the OBU receives the random access parameter sent by the RSU, and the method includes:
  • the OBU receives the broadcast message sent by the RSU, and the broadcast message includes the random access parameter.
  • the random access parameter may be sent by using a broadcast message, and the service type of the non-contention random access preamble may be indicated as a high priority service.
  • the broadcast message may be used for the transmission, and the periodic transmission may be used, and all the OBUs in the coverage area of the RSU may be used for the initial access of the OBU.
  • Step 102 When the OBU has a high-priority service and needs to access the RSU, the non-contention random access preamble and the time-frequency resource of the access channel are used for the non-contention random access; wherein the service that needs to access the RSU includes: Priority business and/or general business.
  • the OBU selects one of the non-contention random access preambles sent by the RSU, and sends the time-frequency resource of the access channel to the RSU, requesting access to the RSU, where the RSU is The OBU allocates an uplink resource, and the OBU sends a scheduling request to the allocated uplink resource; if the OBU is in an idle state, the OBU sends a broadcast message from the RSU.
  • the OBU sends a non-contention random access preamble request to the RSU to access the RSU, where the RSU allocates the OBU The uplink resource, the OBU sends a scheduling request on the allocated uplink resource.
  • the OBU can determine whether the service that needs to access the RSU has high priority services. For example, when multiple services of the OBU need to access the RSU, determine whether the attributes of each service meet the attribute conditions of the preset high-priority service; when the attributes of one service meet the attribute conditions of the preset high-priority service. When it is determined that there is a high-priority service that needs to access the RSU; if the attributes of all the services do not meet the attribute conditions of the preset high-priority service, it is determined that no high-priority service needs to access the RSU, that is, the RSU needs to be accessed.
  • the business is ordinary business.
  • the attribute condition of the preset high-priority service includes: including the vehicle accident information, if the attribute of one of the services of the OBU includes the vehicle accident information, it is determined that the high priority service needs to access the RSU.
  • the method may further include:
  • Step 103 When the OBU does not have a high priority service and needs to access the RSU, the contention frequency resource of the contending random access preamble and the access channel is used for competitive random access.
  • the OBU selects one of the contention random access preambles included in the broadcast message sent by the RSU to perform access.
  • step 102 or step 103 select the same random access preamble to send an access request
  • the OBU identifier and the uplink resource in the response message sent by the RSU are the same, that is, each The OBUs that send the same random access preamble will receive the same response message, and a random access request conflict occurs. If a preamble collision occurs, the OBU chooses to rewind and re-access, where the backoff time can be specified by the RSU. If the access is successful, the RSU allocates an uplink resource to the OBU, and the OBU sends a scheduling request on the allocated uplink resource.
  • a method for accessing a network is provided by the embodiment of the present invention.
  • the OBU receives the random access parameter sent by the RSU.
  • the random access parameter includes: a time-frequency resource of the access channel and a random access preamble, and when the channel is accessed.
  • the frequency resource is used to carry the random access preamble sent by the OBU when accessing the RSU, and the random access preamble includes a non-contention random access preamble and a contention random access preamble.
  • the non-contention random access preamble and the time-frequency resources of the access channel are used for non-contention random access; wherein the services that need to access the RSU include: high priority service and/or common business.
  • the embodiment of the present invention further provides another method for accessing a network. Based on the RSU side, as shown in FIG. 3, the method includes the following steps:
  • the roadside unit RSU determines a random access parameter
  • the RSU sends random access parameters to all OBUs in the coverage area;
  • the random access parameter includes: a time-frequency resource of the access channel and a random access preamble, and the time-frequency resource of the access channel is used to carry a random access preamble sent by the OBU when accessing the RSU, and the random access preamble includes a non- Competing random access preamble and competing random access preamble.
  • the sending, by the RSU, the random access parameters to all the onboard units OBUs in the coverage area may include:
  • the RSU When the OBU is in the RRC connection mode, the RSU sends RRC signaling to the OBU, where the RRC signaling includes a random access parameter.
  • the sending, by the RSU, the random access parameters to all the onboard units OBUs in the coverage area may include:
  • the RSU When the OBU is in the idle mode, the RSU sends a broadcast message to the OBU, where the broadcast message includes a random access parameter.
  • the RSU sends a random access preamble to all the OBUs that want to access itself, and then receives the OBU of the random access preamble to perform random access, so
  • the RSU in the embodiment of the present invention sends a non-contention random access preamble, a contention random access preamble, and a time-frequency resource for the access channel of the foregoing two random access preambles to all the OBUs in the coverage area. Therefore, it is possible to avoid the problem that the vehicle generates disorderly competition for obtaining bandwidth and channel resources due to uneven distribution of the RSU.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • FIG. 4 is a flowchart of Embodiment 1. As shown in FIG. 4, the embodiment includes the following steps:
  • Step 201 The RSU allocates a non-contention random access preamble to the OBU.
  • the OBU is in an RRC connected state, and the RSU sends the allocated non-contention access preamble and the time-frequency resource of the access channel to the OBU through dedicated RRC signaling.
  • the OBU is ready to switch from the other RSU to the current RSU, or the RSU is ready to send downlink data but finds the uplink out of synchronization of the OBU, etc., and the RSU sends a non-contention access preamble to the OBU.
  • Step 202 The OBU sends a random access request to the RSU.
  • the OBU sends a random access request message by using the received non-contention preamble sequence, and the random access request may include an uplink signaling type that needs to be sent.
  • Step 203 The RSU allocates an uplink resource to the OBU.
  • the RSU allocates an uplink resource according to the request of the OBU, and the uplink resource is used to send a scheduling request of the OBU.
  • Step 204 The OBU sends a scheduling request.
  • the OBU sends a scheduling request on the allocated uplink resource.
  • the scheduling request includes the resource requirements of the high priority service sent by the OBU.
  • the OBU sends a scheduling request to the RSU to indicate that the OBU has successfully accessed the RSU.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • This embodiment is a scenario in which the OBU of the common service contends for the random access RSU. As shown in FIG. 5, the embodiment includes the following steps:
  • Step 301 The RSU sends a random access parameter.
  • the RSU sends a random access parameter by using a broadcast message, and the random access parameter includes: a time-frequency resource of the access channel, and a random access preamble.
  • the contention competition random access preamble is a resource pool formed by multiple preamble sequences, and the OBU can randomly select one transmission access request from among them.
  • the time-frequency resource of the access channel is used to send a contention random access preamble sequence;
  • Step 302 The OBU requests to access the RSU.
  • the OBU selects one of the contention random access preamble sequences allocated by the RSU to send a random access request.
  • Step 303 The RSU sends a response message to the OBU.
  • the RSU After receiving the random access request, the RSU sends a random access request response message to the OBU.
  • the response message includes an OBU identifier (such as a cell-radio network temporary identifier C-RNTI) and an uplink resource.
  • the OBU identifier is used to identify the OBU in the subsequent communication, and the uplink resource is used by the OBU to send a scheduling request.
  • step 302 selects the same random access preamble to send an access request, the OBU identifier and the uplink resource in the response message sent by the RSU are the same, that is, each sends the same preamble. The OBU will receive the same response message. A random access request conflict occurs at this time.
  • Step 304 The OBU determines whether a conflict occurs. If yes, go to step 305, if no, go to step 306.
  • the OBU determines whether a collision occurs by the following method: the OBU sends a scheduling request to the allocated uplink resource, does not receive the response message of the RSU or receives the response message of the RSU but cannot decode it correctly, or receives the response message of the RSU, but responds If the identifier of another OBU is found in the message, the OBU determines that a random access request conflict has occurred. If the OBU receives the response message from the RSU and decodes it correctly, and detects its own identity in the response message, then no conflict has occurred.
  • Step 305 The OBU re-initiates a random access request, and the process ends.
  • the random access request is re-initiated, and the range of the backoff time t is specified by the RSU. If the OBU is sent to the OBU in step 303, the OBU randomly selects a backoff time T in (0, t), and the OBU at the time T. Re-initiate the random access request process.
  • the maximum number of re-initiation is specified by the RSU. If the random number of random requests initiated by the OBU is still unsuccessful, the random access procedure fails.
  • Step 306 The OBU sends an acknowledgement message to the RSU, and the process ends.
  • the OBU sends an acknowledgement message "ACK" to the RSU, indicating that the random access is successful.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • This embodiment is a scenario in which a high-priority service of an idle state OBU needs a non-competitive access RSU. As shown in FIG. 6, the embodiment includes the following steps:
  • Step 401 The RSU sends a random access parameter.
  • the RSU sends a random access parameter through a broadcast message.
  • the random access parameters include: a random access preamble and a time-frequency resource of the access channel, and the random access preamble includes: a non-contention random access preamble and a contention random access preamble, and in particular, may also be added in the random access preamble
  • a service type identifier is used to indicate whether the random access preamble is a non-contention random access preamble or a contention random access preamble.
  • Step 402 The OBU sends an access request message to the RSU.
  • the OBU may select a non-contention random access pre-direction RSU to send a random access request message according to the service type identifier in the random access preamble.
  • Step 403 The RSU sends a response message to the OBU.
  • the RSU that receives the access request sends a response message to the OBU, where the response message includes: an OBU identifier (such as a cell-radio network temporary identifier C-RNTI), and an uplink resource.
  • OBU identifier such as a cell-radio network temporary identifier C-RNTI
  • uplink resource is used by the OBU to send a scheduling request.
  • the OBU identifier and the uplink resource in the response message sent by the RSU are the same, that is, each sends the same preamble.
  • the OBU will receive the same response message.
  • a random access request conflict occurs at this time. Even if there are fewer OBUs transmitting high-priority services at the same time, an access request conflict may occur as long as two or more OBUs simultaneously initiate a request.
  • Step 404 The OBU determines whether there is a conflict. If yes, go to step 405, if no, go to step 406.
  • This step is similar to step 304 and will not be described here.
  • step 405 the OBU re-initiates the random access request, and the process ends.
  • This step is similar to the step 305.
  • the difference is that for the high-priority service, the interval for the OBU to re-initiate the random request is shorter than that of the normal service, and the maximum value of the time interval is set by the RSU.
  • Step 406 The OBU sends an acknowledgement message to the RSU, and the process ends.
  • the acknowledgment message is used to indicate that the OBU successfully accesses the RSU, and then the OBU can further transmit data of the high priority service with the RSU.
  • An embodiment of the present invention provides a user equipment 10, where the user equipment is provided with an OBU. As shown in FIG. 7, the user equipment 10 includes:
  • the receiving unit 11 is configured to receive the random access parameter sent by the roadside unit RSU.
  • the random access parameter includes: a time-frequency resource of the access channel and a random access preamble, and the time-frequency resource of the access channel is used to carry the OBU.
  • the random access preamble transmitted when accessing the RSU, the random access preamble includes a non-contention random access preamble and a contention random access preamble;
  • the access unit 13 is configured to perform non-contention random access by using a non-contention random access preamble and an access channel time-frequency resource when the user equipment 10 has a high priority service to access the RSU;
  • RSU's business includes: high priority business and / or general business.
  • the access unit 13 is further configured to:
  • the contending random access preamble and the time-frequency resources of the access channel are used for contention random access.
  • the receiving unit 11 is configured to:
  • the RRC signaling sent by the RSU is received, and the RRC signaling includes a random access parameter.
  • the receiving unit 11 is configured to:
  • the broadcast message sent by the RSU is received, and the broadcast message includes a random access parameter.
  • the user equipment provided by the embodiment of the present invention receives the random access parameter sent by the RSU, where the random access parameter includes: a time-frequency resource of the access channel and a random access preamble, and the time-frequency resource of the access channel is used to carry the Random access preamble sent by the user equipment when accessing the RSU, before random access
  • the non-contention random access preamble and the contention random access preamble are used.
  • the non-contention random access preamble and the time channel resources of the access channel are used for non-competitive random access.
  • the services that need to access the RSU include: high-priority services and/or general services.
  • the embodiment of the present invention provides a base station 20, where the base station 20 is provided with an RSU. As shown in FIG. 8, the base station 20 includes:
  • the determining unit 21 is configured to determine a random access parameter, where the random access parameter includes: a time-frequency resource of the access channel and a random access preamble, and the time-frequency resource of the access channel is used to carry the OBU to access the RSU
  • the random access preamble includes a non-contention random access preamble and a contention random access preamble.
  • the transmitting unit 22 is configured to transmit random access parameters to all onboard units OBU within the coverage.
  • the sending unit 22 is configured to:
  • the RRC signaling is sent to the OBU, where the RRC signaling includes a random access parameter.
  • the sending unit 22 is configured to:
  • a broadcast message is sent to the OBU, where the broadcast message includes a random access parameter.
  • the embodiment of the present invention further provides an access system.
  • the system includes: a user equipment 10 and a base station 20, wherein the user equipment 10 and the base station 20 are connected through air interfaces.
  • the embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the foregoing embodiments. method.
  • each module/unit in the above embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program stored in the memory by a processor. / instruction to achieve its corresponding function.
  • the invention is not limited to any specific form of combination of hardware and software.
  • the above solution can avoid the problem that the vehicle generates disorderly competition for obtaining bandwidth and channel resources due to uneven distribution of RSU.

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Abstract

La présente invention concerne un procédé, un appareil et un système d'accès à un réseau. Le procédé comprend les étapes au cours desquelles : une OBU reçoit un paramètre d'accès aléatoire envoyé par une RSU, le paramètre d'accès aléatoire comprenant une ressource temps-fréquence de canal d'accès et un préambule d'accès aléatoire, la ressource temps-fréquence de canal d'accès étant utilisée pour véhiculer le préambule d'accès aléatoire envoyé par l'OBU lors d'un accès à la RSU, le préambule d'accès aléatoire comprenant un préambule d'accès aléatoire non compétitif et un préambule d'accès aléatoire compétitif ; et lorsque l'OBU a un service à haute priorité qui doit accéder à la RSU, effectuer un accès aléatoire non compétitif à l'aide du préambule d'accès aléatoire non compétitif et de la ressource temps-fréquence de canal d'accès, le service qui doit accéder à la RSU comprenant un service à haute priorité et/ou un service commun. La solution peut éviter le problème d'une compétition désordonnée entre des véhicules pour obtenir une bande passante et des ressources de canal à cause de la répartition irrégulière des RSU.
PCT/CN2016/100333 2016-09-27 2016-09-27 Procédé, appareil et système d'accès à un réseau WO2018058303A1 (fr)

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