CN106162924B - Method, device and system for accessing network - Google Patents
Method, device and system for accessing network Download PDFInfo
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- CN106162924B CN106162924B CN201510185794.8A CN201510185794A CN106162924B CN 106162924 B CN106162924 B CN 106162924B CN 201510185794 A CN201510185794 A CN 201510185794A CN 106162924 B CN106162924 B CN 106162924B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
Abstract
The method, the device and the access system for accessing the network provided by the embodiment of the invention comprise the following steps: the OBU receives the random access parameters sent by the RSU; wherein, the random access parameters comprise: the method comprises the steps that time frequency resources and random access preambles of an access channel are used for bearing random access preambles sent by an OBU when the OBU is accessed to an RSU, the random access preambles comprise non-competitive random access preambles and competitive random access preambles, and when the OBU has high-priority service and needs to be accessed to the RSU, the non-competitive random access preambles and the time frequency resources of the access channel are used for carrying out non-competitive random access; the services needing to be accessed to the RSU comprise: high priority traffic and/or normal traffic. By the scheme, the problem that disordered competition is generated for obtaining bandwidth and channel resources by vehicles due to uneven distribution of RSUs can be solved.
Description
Technical Field
The present invention relates to mobile communication technologies, and in particular, to a method, an apparatus, and a system for accessing a network.
Background
With the rapid development of economic society, the quantity of automobile reserves in China is rapidly increased, road traffic accidents frequently occur, the road traffic accidents become one of important factors influencing the public security sense of China in recent years, and the problem of road traffic safety becomes one of basic problems influencing society and harmoniously improving civilian life. China urgently needs to improve traffic safety in the aspects of technology, policy, education and the like, wherein the improvement of vehicle safety design is an important component.
Technologies for improving vehicle safety are mainly classified into passive safety technologies and active safety technologies. The passive safety technology is used for protecting personnel and articles inside and outside the vehicle after an accident occurs; the active safety technology is used for preventing and reducing vehicle accidents and avoiding personnel from being injured; active safety technology is the focus and trend of modern vehicle safety technology development.
The collision early warning system based on communication realizes real-time information interaction between vehicles and road side infrastructures by utilizing advanced wireless communication technology and new generation information processing technology, informs current states (including positions, speeds, accelerations and driving paths of the vehicles) and acquired road environment information of each other, cooperatively senses road dangerous conditions, provides various collision early warning information in time, prevents road traffic safety accidents from happening, and becomes a new idea for trying to solve the road traffic safety problems in all countries at present.
Vehicle networking (Vehicle to influencing, V2X): the Vehicle information is provided through sensors, Vehicle terminals and electronic tags which are arranged on the Vehicle, various communication technologies are adopted to realize interconnection and intercommunication between vehicles (V2V), vehicles and people (V2P), vehicles and roads (Infrastructure) (V2I), and information is effectively utilized such as extracted and shared on an information network platform, so that the Vehicle is effectively controlled and comprehensive services are provided. Fig. 1 is a schematic diagram of traffic and scheduling information transmitted to vehicles through a network information platform.
With the development of new mobile communication technology in recent years, research for solving communication applications based on the internet of vehicles using Long Term Evolution (LTE) technology has internationally emerged.
The roadside communication unit RSU (road Side Unit) can receive a vehicle request, ensure that the vehicle accesses the Internet and has the function of a gateway; in addition, the system also has the functions of data operation, storage and forwarding.
Vehicle to Road Side Unit (V2R), also known as V2I. The main characteristics of V2R communication include: (1) when RSU broadcasts, the broadcast information is only sent to all vehicles in the coverage area; (2) single-hop transmission is adopted between the RSU and the vehicle, so that adverse effects of low packet transmission success rate, low network throughput and the like caused by multiple hops are prevented; (3) the RSU can quickly receive the detected passing vehicles, traffic lights and some road condition information, and process, reorder and filter the information and then send the information to the vehicles. The three aspects ensure that the vehicle can reliably access the Internet or download data stored by the RSU in real time by establishing connection with the RSU when the vehicle passes through the RSU.
The RSU has the features of short range coverage (hundreds of meters), low cost, easy deployment and high data access speed (about l0Mbps), and the following problems exist when an On Board Unit (OBU) accesses the RSU in the existing V2R communication:
the deployment of the RSUs has no unified management, the RSUs have limited bandwidth and channel resources, which causes the problem of uneven distribution of the RSUs and the out-of-order competition behavior of vehicles for obtaining more bandwidth and channel resources. For example, in an urban scene, when an overlapping region exists among a plurality of RSUs, when a vehicle is not properly accessed to the RSU policy, load imbalance among the RSUs is caused, and network resource utilization rate is reduced.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention provide a method, an apparatus, and a system for accessing a network, which can solve the problem of out-of-order contention generated by a vehicle for obtaining bandwidth and channel resources due to uneven distribution of RSUs.
The embodiment of the invention provides a method for accessing a network, which comprises the following steps:
the OBU receives the random access parameters sent by the RSU; wherein the random access parameters include: time frequency resources and random access preambles of an access channel, wherein the time frequency resources of the access channel are used for bearing the random access preambles transmitted by the OBU when the OBU is accessed to the RSU, and the random access preambles comprise non-competitive random access preambles and competitive random access preambles;
when the OBU has high priority service to be accessed to the RSU, the non-competitive random access preamble and the time frequency resource of the access channel are used for carrying out non-competitive random access; the services needing to access the RSU comprise: high priority traffic and/or normal traffic.
Further, the method further comprises:
and when the OBU does not have high-priority service to be accessed to the RSU, using the competitive random access preamble and the time-frequency resource of the access channel to perform competitive random access.
Further, the receiving, by the on-board unit OBU, the random access parameter sent by the roadside unit RSU includes:
if the OBU is in a Radio Resource Control (RRC) connection mode, the OBU receives an RRC signaling sent by the RSU, wherein the RRC signaling contains the random access parameter.
Further, the receiving, by the on-board unit OBU, the random access parameter sent by the roadside unit RSU includes:
and if the OBU is in an idle mode, the OBU receives a broadcast message sent by the RSU, wherein the broadcast message comprises the random access parameter.
The embodiment of the invention also provides another method for accessing the network, which comprises the following steps:
a roadside unit RSU determines a random access parameter; wherein the random access parameters include: the time frequency resource of the access channel is used for bearing the random access preamble sent by the OBU when the OBU is accessed to the RSU, and the random access preamble comprises a non-competitive random access preamble and a competitive random access preamble;
the road side unit RSU sends the random access parameters to all vehicle-mounted units OBUs within a coverage range;
wherein the random access parameters include: the time frequency resource of the access channel is used for bearing the random access preamble sent by the OBU when accessing the RSU, and the random access preamble comprises a non-competitive random access preamble and a competitive random access preamble.
Further, the sending, by the roadside unit RSU, the random access parameter to all on-board units OBUs within a coverage area includes:
and when the OBU is in a Radio Resource Control (RRC) connection mode, the RSU sends RRC signaling to the OBU, wherein the RRC signaling contains the random access parameters.
Further, the sending, by the roadside unit RSU, the random access parameter to all on-board units OBUs within a coverage area includes:
and when the OBU is in an idle mode, the RSU sends a broadcast message to the OBU, wherein the broadcast message contains the random access parameter.
An embodiment of the present invention provides a user equipment, where the user equipment includes:
the receiving unit is used for receiving the random access parameters sent by the roadside unit RSU; wherein the random access parameters include: time frequency resources and random access preambles of an access channel, wherein the time frequency resources of the access channel are used for bearing the random access preambles sent by the user equipment when the user equipment is accessed to the RSU, and the random access preambles comprise non-competitive random access preambles and competitive random access preambles;
an access unit, configured to perform non-contention random access using the non-contention random access preamble and the time-frequency resource of the access channel when the user equipment has a high-priority service and needs to access the RSU; the services needing to access the RSU comprise: high priority traffic and/or normal traffic.
Further, the access unit is further configured to:
and when the user equipment does not have high-priority service to be accessed to the RSU, performing competitive random access by using the competitive random access preamble and the time-frequency resource of the access channel.
Further, the receiving unit is specifically configured to:
and if the user equipment is in a Radio Resource Control (RRC) connection mode, receiving an RRC signaling sent by the RSU, wherein the RRC signaling contains the random access parameter.
Further, the receiving unit is specifically configured to:
and if the user equipment is in an idle mode, receiving a broadcast message sent by the RSU, wherein the broadcast message comprises 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; wherein the random access parameters include: the time frequency resource of the access channel is used for bearing the random access preamble sent by the OBU when the OBU is accessed to the RSU, and the random access preamble comprises a non-competitive random access preamble and a competitive random access preamble;
and the sending unit is used for sending the random access parameters to all On Board Units (OBUs) in a coverage range.
Further, the sending unit is specifically configured to:
and when the OBU is in a Radio Resource Control (RRC) connection mode, sending an RRC signaling to the OBU, wherein the RRC signaling contains the random access parameter.
Further, the sending unit is specifically configured to:
and when the OBU is in an idle mode, sending a broadcast message to the OBU, wherein the broadcast message comprises the random access parameter.
The embodiment of the invention also provides an access system, which comprises the user equipment and the base station.
In the method, the device and the system for accessing the network provided by the embodiment of the invention, the OBU receives the random access parameter sent by the RSU; wherein, the random access parameters comprise: the method comprises the steps that time frequency resources and random access preambles of an access channel are used for bearing random access preambles sent by an OBU when the OBU is accessed to an RSU, the random access preambles comprise non-competitive random access preambles and competitive random access preambles, and when the OBU has high-priority services and needs to be accessed to the RSU, the non-competitive random access preambles and the time frequency resources of the access channel are used for non-competitive random access; the services needing to access the RSU comprise: high priority traffic and/or normal traffic. By the scheme, the problem that disordered competition is generated for obtaining bandwidth and channel resources by vehicles due to uneven distribution of RSUs can be solved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic diagram of traffic and scheduling information sent to vehicles via a network information platform;
fig. 2 is a flowchart illustrating a method for accessing a network according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart according to a first embodiment of the present invention;
FIG. 4 is a schematic flow chart of a second embodiment of the present invention;
FIG. 5 is a schematic flow chart of a third embodiment of the present invention;
fig. 6 is a schematic structural diagram of a user equipment according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an access system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
The on-board unit (OBU) in the embodiment of the invention is arranged in User Equipment (UE), and the roadside unit (RSU) is arranged in a base station, wherein the user equipment comprises but is not limited to terminals such as a handheld terminal, a tablet computer, a smart phone and a Personal Computer (PC), and the base station comprises but is not limited to a base station of an LTE system.
An embodiment of the present invention provides a method for accessing a network, based on an OBU side, as shown in fig. 2, the method includes:
The RSU can divide the random access preamble into a competitive random access preamble and a non-competitive random access preamble according to a predefined rule; the services that the OBU needs to access the RSU include: high priority service or common service, non-competitive random access preamble aiming at high priority service, such as traffic accident information, road emergency information, etc.; the contention random access preamble is directed to general services, such as peripheral hotel information, gas station information, and the like.
Further, for step 101: the receiving, by the OBU, the random access parameter sent by the RSU may specifically be:
and if the OBU is in the RRC connection mode, the OBU receives an RRC signaling sent by the RSU, wherein the RRC signaling contains random access parameters.
Specifically, for an OBU in an RRC connected mode, the RSU transmits the random access parameter using an RRC signaling, and particularly, when the OBU has a high priority service access request to be switched to another RSU from the current RSU or the OBU transmits a new acknowledgement message to the RSU, the OBU directly transmits a non-contention random access preamble and a time-frequency resource of an access channel using the RRC signaling.
Further, for step 101: the receiving, by the OBU, the random access parameter sent by the RSU may specifically be:
and if the OBU is in an idle mode, the OBU receives a broadcast message sent by the RSU, wherein the broadcast message contains the random access parameter.
Specifically, for the OBU in the idle mode, the random access parameter may be sent by using a broadcast message, and the type of the service that may use the non-contention random access preamble may also be indicated as a high-priority service.
It should be noted that, in the embodiment of the present invention, for the contention random access preamble, the contention random access preamble may be transmitted using a broadcast message, and the periodic transmission may be adopted, and for all OBUs in the coverage area of the RSU, the case of initial access of the OBU may be used.
102, when the OBU has high priority service to access the RSU, using the non-competitive random access preamble and the time frequency resource of the access channel to perform non-competitive random access; the services needing to be accessed to the RSU comprise: high priority traffic and/or normal traffic.
Specifically, if the OBU is in the RRC connected state, the OBU selects one non-contention random access preamble from the RSU and transmits the time-frequency resource of the access channel to the RSU to request access to the RSU, the RSU allocates an uplink resource to the OBU, and the OBU transmits a scheduling request on the allocated uplink resource; if the OBU is in an idle state, the OBU selects one from non-competitive random access preambles contained in a broadcast message sent by an RSU and sends the selected one to the RSU by using a time-frequency resource of an access channel; the OBU sends a non-competitive random access preamble to the RSU to request to access the RSU, the RSU allocates uplink resources for the OBU, and the OBU sends a scheduling request on the allocated uplink resources.
It should be noted that the OBU may determine whether the service that needs to access the RSU has a high priority service by itself. For example: when the OBU has a plurality of services to be accessed to the RSU, judging whether the attribute of each service meets the preset attribute condition of the high-priority service; when the attribute of one service meets the preset attribute condition of the high-priority service, determining that the high-priority service needs to be accessed to the RSU; and when the attribute of each service does not meet the preset attribute condition of the high-priority service, determining that no high-priority service needs to be accessed to the RSU, namely that the service needing to be accessed to the RSU is a common service.
For example, it is assumed that the attribute conditions of the preset high-priority service are as follows: and if the attribute of one service in the services of the OBU contains the traffic accident information, determining that the high-priority service needs to be accessed to the RSU.
Further, as shown in fig. 2, the method may further include:
and 103, when the OBU does not have a high-priority service to access the RSU, performing competitive random access by using the competitive random access preamble and the time-frequency resource of the access channel.
Specifically, the OBU selects one of the contention random access preambles included in the broadcast message transmitted by the RSU for access.
It should be noted that: if two or more OBUs select the same random access preamble to send the access request in step 102 or step 103, the OBU identifier in the response message sent by the RSU is the same as the uplink resource, that is, each OBU sending the same random access preamble receives the same response message, and at this time, a random access request collision occurs. If a preamble collision occurs, the OBU selects a back-off re-access, where the back-off time may be specified by the RSU. And if the access is successful, the RSU allocates uplink resources for the OBU, and the OBU sends a scheduling request on the allocated uplink resources.
In the method for accessing a network provided by the embodiment of the invention, an OBU receives a random access parameter sent by an RSU; wherein, the random access parameters comprise: the method comprises the steps that time frequency resources and random access preambles of an access channel are used for bearing random access preambles sent by an OBU when the OBU is accessed to an RSU, the random access preambles comprise non-competitive random access preambles and competitive random access preambles, and when the OBU has high-priority service and needs to be accessed to the RSU, the non-competitive random access preambles and the time frequency resources of the access channel are used for carrying out non-competitive random access; the services needing to be accessed to the RSU comprise: high priority traffic and/or normal traffic. By the scheme of the embodiment of the invention, the problem of disordered competition of vehicles for obtaining bandwidth and channel resources caused by uneven distribution of RSUs can be solved.
The embodiment of the invention also provides another network access method, which is based on the RSU side and comprises the following steps:
the RSU sends random access parameters to all OBUs within the coverage range;
wherein, the random access parameters comprise: the time frequency resource of the access channel is used for bearing the random access preamble sent by the OBU when the OBU is accessed to the RSU, and the random access preamble comprises a non-competitive random access preamble and a competitive random access preamble.
Further, the sending, by the RSU, the random access parameter to all on-board units OBUs within the coverage area may specifically be:
and when the OBU is in an RRC connection mode, the RSU sends an RRC signaling to the OBU, wherein the RRC signaling contains random access parameters.
Further, the sending, by the RSU, the random access parameter to all on-board units OBUs within the coverage area may specifically be:
and when the OBU is in an idle mode, the RSU sends a broadcast message to the OBU, wherein the broadcast message contains the random access parameter.
It should be noted that, in the existing scheme for accessing the RSU by the OBU, the RSU sends the random access preamble to all OBUs that want to access itself, and then receives the OBUs with the random access preamble to perform the contention random access, so, compared with the existing technical scheme, the RSU in the embodiment of the present invention sends the non-contention random access preamble, the contention random access preamble, and the time-frequency resource of the access channel for carrying the two types of random access preambles to all OBUs within the coverage, thereby solving the problem of the disordered contention generated by the vehicle for obtaining the bandwidth and the channel resource due to the non-uniform distribution of the RSU.
In order to make those skilled in the art understand the technical solution provided by the present invention more clearly, the following describes the method for accessing the network in detail by using specific embodiments:
the first embodiment is as follows:
the embodiment aims at the scene that the OBU in the RRC connection state has high priority service and needs non-competitive random access; fig. 3 is a flowchart of the first embodiment, and as shown in fig. 3, the present embodiment includes the following steps:
step 201, the RSU allocates a non-contention random access preamble to the OBU.
The OBU is in RRC connection state, and the RSU sends the allocated non-competitive access preamble and the time frequency resource of the access channel to the OBU through dedicated RRC signaling. For example, the OBU prepares to switch to access the current RSU from other RSUs, or the RSU prepares to send downlink data but finds out the uplink out-of-step of the OBU, and so on, 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 adopting the received non-competitive leader sequence, wherein the random access request can contain an uplink signaling type to be sent.
And step 203, the RSU allocates uplink resources for the OBU.
And the RSU allocates uplink resources according to the request of the OBU, and the uplink resources are used for sending the scheduling request of the OBU.
And step 204, the OBU sends a scheduling request.
And the OBU sends a scheduling request on the allocated uplink resource. The scheduling request includes the resource requirement of the high-priority service sent by the OBU.
It should be noted that, the OBU sends a scheduling request to the RSU to indicate that the OBU has successfully accessed the RSU.
Example two:
the embodiment is a scene aiming at the situation that an OBU of a common service competes for random access to an RSU; as shown in fig. 4, the present embodiment includes the following steps:
step 301, the RSU sends the random access parameter.
The RSU sends random access parameters through a broadcast message, wherein the random access parameters at least comprise: and accessing time-frequency resources of the channel and competing for random access preamble. The contention random access preamble is a resource pool formed by a plurality of preamble sequences, and the OBU can randomly select one from the resource pool to send an access request. The time frequency resource of the access channel is used for sending a competitive random access leader sequence;
step 302, the OBU requests access to the RSU.
The OBU selects one of the competition 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.
After receiving the random access request, the RSU sends a random access request response message to the OBU, wherein the response message at least comprises: an OBU identifier (e.g., cell-radio network temporary identifier C-RNTI), and uplink resources. The OBU identification is used for identifying the OBU in subsequent communication, and the uplink resource is used for the OBU to send a scheduling request.
It should be noted that: if two or more OBUs select the same random access preamble to transmit the access request in step 302, the OBU identifier in the response message transmitted by the RSU is the same as the uplink resource, i.e. each OBU transmitting the same preamble receives the same response message. At which point a random access request collision occurs.
And step 304, the OBU judges whether the conflict occurs. If so, go to step 305, otherwise go to step 306.
The OBU judges whether conflict occurs by the following method: and the OBU sends a scheduling request on the allocated uplink resource, and determines that the collision of the random access request occurs if the OBU does not receive the response message of the RSU or receives the response message of the RSU but cannot decode correctly or finds the identification of other OBUs in the response message. If the OBU receives the RSU's response message and decodes it correctly and detects its own identity in the response message, it is indicated that no collision has occurred.
Step 305, the OBU re-initiates the random access request.
The OBU re-initiates the random access request after backing for a period of time, wherein the range of the back-off time T is specified by the RSU, as sent to the OBU in step 303, the OBU randomly selects a back-off time T in (0, T), and the OBU re-initiates the random access request process at time T.
The maximum number of re-initiations is specified by the RSU, and if the random request initiated the most number of times at the OBU is not yet successful, the random access procedure fails.
Step 306, the OBU sends an acknowledgement message to the RSU.
The OBU sends an acknowledgement message "ACK" to the RSU indicating that the random access was successful.
Example three:
the embodiment is directed to a scenario that an idle OBU has a high priority service and needs non-competitive access to an RSU; as shown in fig. 5, the present embodiment includes the following steps:
step 401, the RSU sends the random access parameter.
The RSU sends the random access parameters through a broadcast message. The random access parameters include: random access preamble and time-frequency resources of an access channel, the random access preamble comprising: the random access preamble may further include a service type identifier for indicating 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.
Because the service of the OBU is a high-priority service, the OBU may select a non-contention random access preamble according to the service type identifier in the random access preamble to direct the RSU to transmit a random access request message.
In step 403, the RSU sends a response message to the OBU.
The RSU receiving the access request sends a response message to the OBU, wherein the response message at least comprises: an OBU identifier (e.g., cell-radio network temporary identifier C-RNTI), and uplink resources. The OBU identification is used for identifying the OBU in subsequent communication, and the uplink resource is used for the OBU to send a scheduling request.
It should be noted that: if two or more OBUs select the same random access preamble to transmit the access request in step 402, the OBU identifier in the response message transmitted by the RSU is the same as the uplink resource, i.e. each OBU transmitting the same preamble receives the same response message. At which point a random access request collision occurs. Even if there are fewer OBUs transmitting high priority traffic simultaneously, access request collisions may occur as long as there are two or more OBUs initiating requests simultaneously.
This step is similar to step 304 and will not be described herein.
In step 405, the OBU re-initiates the random access request.
This step is similar to step 305, except that: for the high priority service, the interval time of the OBU reinitiating the random request is shorter than that of the ordinary service, and the maximum value of the interval time is set by the RSU.
At step 406, the OBU sends an acknowledgement message to the RSU.
The acknowledgement message is used to indicate that the OBU successfully accesses the RSU, and then the OBU may further transmit data of high priority traffic with the RSU.
An embodiment of the present invention provides a user equipment 10, where an OBU is disposed in the user equipment, and as shown in fig. 6, the user equipment 10 includes:
a receiving unit 11, configured to receive a random access parameter sent by a roadside unit RSU; wherein, the random access parameters comprise: the time frequency resource of the access channel is used for bearing the random access preamble sent by the OBU when the OBU is accessed to the RSU, and the random access preamble comprises a non-competitive random access preamble and a competitive random access preamble;
an access unit 13, configured to perform non-contention random access by using a non-contention random access preamble and a time-frequency resource of an access channel when the user equipment 10 has a high-priority service that needs to access the RSU; the services needing to be accessed to the RSU comprise: high priority traffic and/or normal traffic.
Further, the access unit 13 is further configured to:
when the user equipment 10 does not have the high priority service to access the RSU, the contention random access preamble and the time-frequency resource of the access channel are used for contention random access.
Further, the receiving unit 11 is specifically configured to:
if the ue 10 is in the RRC connected mode, the ue receives an RRC signaling sent by the RSU, where the RRC signaling includes a random access parameter.
Further, the receiving unit 11 is specifically configured to:
if the ue 10 is in the idle mode, a broadcast message sent by the RSU is received, where the broadcast message includes a random access parameter.
The present embodiment is used to implement the above method embodiments, and the working process and the working principle of each unit in the present embodiment refer to the description in the above method embodiments, which are not described herein again.
The user equipment provided by the embodiment of the invention receives the random access parameters sent by the RSU; wherein, the random access parameters comprise: the time frequency resource of the access channel and the random access preamble are used for bearing the random access preamble sent by the user equipment when the user equipment accesses the RSU, the random access preamble comprises a non-competitive random access preamble and a competitive random access preamble, and when the user equipment needs to access the RSU due to high priority service, the non-competitive random access preamble and the time frequency resource of the access channel are used for non-competitive random access; the services needing to be accessed to the RSU comprise: high priority traffic and/or normal traffic. By the scheme of the embodiment of the invention, the problem of disordered competition of vehicles for obtaining bandwidth and channel resources caused by uneven distribution of RSUs can be solved.
An embodiment of the present invention provides a base station 20, where the base station 20 is provided with an RSU, and as shown in fig. 7, the base station 20 includes:
a determining unit 21, configured to determine a random access parameter; wherein, the random access parameters comprise: and the time frequency resource of the access channel is used for bearing the random access preamble sent by the OBU when the OBU is accessed to the RSU, and the random access preamble comprises a non-competitive random access preamble and a competitive random access preamble.
And the sending unit 22 is used for sending the random access parameters to all the On Board Units (OBUs) in the coverage area.
Further, the sending unit 22 is specifically configured to:
and when the OBU is in an RRC connection mode, sending an RRC signaling to the OBU, wherein the RRC signaling contains random access parameters.
Further, the sending unit 22 is specifically configured to:
and when the OBU is in an idle mode, sending a broadcast message to the OBU, wherein the broadcast message contains the random access parameter.
The present embodiment is used to implement the above method embodiments, and the working process and the working principle of each unit in the present embodiment refer to the description in the above method embodiments, which are not described herein again.
An embodiment of the present invention further provides an access system, as shown in fig. 8, the system includes: the user equipment 10 and the base station 20, wherein the user equipment 10 and the base station 20 are connected over the air interface.
It should be noted that, for the operation flows and the operation principles of the user equipment 10 and the base station 20 included in the access system, reference is made to the description in the embodiments of the methods described above, and details are not described here again.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (15)
1. A method for accessing a network, comprising:
the OBU receives the random access parameters sent by the RSU; wherein the random access parameters include: time frequency resources and random access preambles of an access channel, wherein the time frequency resources of the access channel are used for bearing the random access preambles transmitted by the OBU when the OBU is accessed to the RSU, and the random access preambles comprise non-competitive random access preambles and competitive random access preambles;
when the OBU has high priority service to be accessed to the RSU, the non-competitive random access preamble and the time frequency resource of the access channel are used for carrying out non-competitive random access; the services needing to access the RSU comprise: high priority traffic and/or ordinary traffic;
the OBU sends a scheduling request on the uplink resource allocated by the RSU; and the RSU distributes the uplink resource to the OBU after receiving the non-contention random access preamble sent by the OBU.
2. The method of claim 1, further comprising:
and when the OBU does not have high-priority service to be accessed to the RSU, using the competitive random access preamble and the time-frequency resource of the access channel to perform competitive random access.
3. The method of claim 1, wherein the receiving, by the on-board unit (OBU), the random access parameters transmitted by the roadside unit (RSU) comprises:
and if the OBU is in a Radio Resource Control (RRC) connection mode, the OBU receives an RRC signaling sent by the RSU, wherein the RRC signaling contains the random access parameters.
4. The method of claim 1, wherein the receiving, by the on-board unit (OBU), the random access parameters transmitted by the roadside unit (RSU) comprises:
and if the OBU is in an idle mode, the OBU receives a broadcast message sent by the RSU, wherein the broadcast message comprises the random access parameter.
5. A method for accessing a network, comprising:
a roadside unit RSU determines a random access parameter; wherein the random access parameters include: the time frequency resource of the access channel is used for bearing the random access preamble sent by the OBU when the OBU is accessed to the RSU, and the random access preamble comprises a non-competitive random access preamble and a competitive random access preamble;
the roadside unit RSU sends the random access parameters to all vehicle-mounted units OBUs within a coverage range, so that the OBUs use the non-competitive random access preamble and the time-frequency resources of the access channel to perform non-competitive random access when high-priority services need to be accessed to the RSUs;
and after receiving the non-contention random access preamble sent by the OBU, the roadside unit RSU allocates uplink resources for the OBU, so that the OBU sends a scheduling request on the uplink resources allocated by the RSU.
6. The method of claim 5, wherein the transmitting the random access parameters to all On Board Units (OBUs) within a coverage area by the roadside unit (RSU) comprises:
and when the OBU is in a Radio Resource Control (RRC) connection mode, the RSU sends RRC signaling to the OBU, wherein the RRC signaling contains the random access parameters.
7. The method of claim 5, wherein the transmitting the random access parameters to all On Board Units (OBUs) within a coverage area by the roadside unit (RSU) comprises:
and when the OBU is in an idle mode, the RSU sends a broadcast message to the OBU, wherein the broadcast message contains the random access parameter.
8. A user device, comprising:
the receiving unit is used for receiving the random access parameters sent by the roadside unit RSU; wherein the random access parameters include: time frequency resources and random access preambles of an access channel, wherein the time frequency resources of the access channel are used for bearing the random access preambles sent by the user equipment when the user equipment is accessed to the RSU, and the random access preambles comprise non-competitive random access preambles and competitive random access preambles;
an access unit, configured to perform non-contention random access using the non-contention random access preamble and the time-frequency resource of the access channel when the user equipment has a high-priority service and needs to access the RSU; the services needing to access the RSU comprise: high priority traffic and/or ordinary traffic;
the access unit is further configured to send a scheduling request on the uplink resource allocated by the RSU; wherein the uplink resource is allocated by the RSU after receiving the non-contention random access preamble.
9. The UE of claim 8, wherein the access unit is further configured to:
and when the user equipment does not have high-priority service to be accessed to the RSU, performing competitive random access by using the competitive random access preamble and the time-frequency resource of the access channel.
10. The ue of claim 8, wherein the receiving unit is specifically configured to:
and if the user equipment is in a Radio Resource Control (RRC) connection mode, receiving an RRC signaling sent by the RSU, wherein the RRC signaling contains the random access parameter.
11. The ue of claim 8, wherein the receiving unit is specifically configured to:
and if the user equipment is in an idle mode, receiving a broadcast message sent by the RSU, wherein the broadcast message comprises the random access parameter.
12. A base station, comprising:
a determining unit, configured to determine a random access parameter; wherein the random access parameters include: the time frequency resource of the access channel is used for bearing the random access preamble sent by the OBU when the OBU is accessed to the RSU, and the random access preamble comprises a non-competitive random access preamble and a competitive random access preamble;
a sending unit, configured to send the random access parameter to all on-board units (OBUs) in a coverage area, so that when a high-priority service needs to access the RSU, the OBUs performs non-contention random access by using the non-contention random access preamble and the time-frequency resource of the access channel;
the sending unit is further configured to allocate uplink resources to the OBU after receiving the non-contention random access preamble sent by the OBU, so that the OBU sends a scheduling request on the allocated uplink resources.
13. The base station of claim 12, wherein the sending unit is specifically configured to:
and when the OBU is in a Radio Resource Control (RRC) connection mode, sending an RRC signaling to the OBU, wherein the RRC signaling contains the random access parameter.
14. The base station of claim 12, wherein the sending unit is specifically configured to:
and when the OBU is in an idle mode, sending a broadcast message to the OBU, wherein the broadcast message comprises the random access parameter.
15. An access system comprising a user equipment according to any one of claims 8 to 11 and a base station according to any one of claims 12 to 14.
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| WO2018058303A1 (en) * | 2016-09-27 | 2018-04-05 | 中兴通讯股份有限公司 | Method, apparatus and system for accessing network |
| CN108391319B (en) * | 2017-02-03 | 2023-05-16 | 华为技术有限公司 | Method and device for transmitting random access preamble |
| KR102364108B1 (en) | 2017-11-22 | 2022-02-18 | 지티이 코포레이션 | Coexistence of different random access resources and associations |
| CN110545586B (en) * | 2018-05-28 | 2023-03-24 | 中兴通讯股份有限公司 | Random access sequence resource allocation method, related device and storage medium |
| CN111836183B (en) * | 2019-04-12 | 2023-04-07 | 中信科智联科技有限公司 | Method and device for selecting sending resource pool and vehicle-mounted unit |
| CN111918406A (en) * | 2019-05-09 | 2020-11-10 | 中兴通讯股份有限公司 | Wireless access method and device |
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| US8892028B2 (en) * | 2011-09-27 | 2014-11-18 | Broadcom Corporation | Method and apparatus for a cellular assisted intelligent transportation system |
| CN103441847B (en) * | 2013-08-13 | 2016-06-22 | 广东工业大学 | A kind of vehicle identity authentication method based on virtual machine migration technology |
| CN104486172A (en) * | 2014-11-20 | 2015-04-01 | 北京交控科技有限公司 | Urban track traffic integrated wireless transmission system based on LTE (long term evolution) |
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