CN106686724B - Cooperative diversity application method in 3GPP V2X - Google Patents
Cooperative diversity application method in 3GPP V2X Download PDFInfo
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- CN106686724B CN106686724B CN201510744722.2A CN201510744722A CN106686724B CN 106686724 B CN106686724 B CN 106686724B CN 201510744722 A CN201510744722 A CN 201510744722A CN 106686724 B CN106686724 B CN 106686724B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/30—Resource management for broadcast services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a cooperative diversity application method in 3GPP V2X, which comprises the following steps: the V2X broadcast service initiator sends control message in the control resource pool, and then sends the data message in the data resource pool; the control message and the data message are both possible to be retransmitted, and the control message carries scheduling information of the first transmission and the possible retransmission of the data message; after the V2X broadcast service initiator sends a data broadcast message, each relay node forwards the data broadcast message in a cooperative diversity mode with a random phase difference, and the forwarding behavior includes forwarding first transmission and forwarding retransmission of data and/or control messages. The invention can improve the QoS performance of the service message on the premise of not changing parameters such as resource occupation, time delay and the like.
Description
Technical Field
The invention relates to a vehicle networking communication technology, in particular to a cooperative diversity application method in 3GPP V2X.
Background
With the rapid increase of vehicle holding rate and density and the frequent occurrence of road traffic accidents, the internet of vehicles has gradually become one of the hot concerns in the communication field. The car networking can greatly improve the perception range and the perception degree of the active safety system of the car, reduce the probability of traffic accidents, indirectly realize the effects of relieving traffic jam, improving road bearing capacity and the like by the mutual communication between the car and the traffic facility and combining the technologies of a positioning system, a sensor, an intelligent car control system, machine vision analysis and the like.
V2X is a communication technology dedicated to the field of car networking in 3GPP, and includes different types of car communication technologies, such as V2V (Vehicle to Vehicle), V2I (Vehicle to Infrastructure), and V2P (Vehicle to peer). The V2X communication mainly depends on the direct connection of terminals, a specific communication mechanism is not determined, and the basic idea is to improve and enhance the existing 3GPP D2D communication technology based on the technical indexes of low delay, high reliability, support of dense networking and the like in the Internet of vehicles.
In the D2D technology, when a node has a service message that needs to be broadcasted, it needs to send two types of message messages, namely the service message itself and a control message corresponding to the service message. The node needs to acquire the time-frequency resources used for sending the two types of messages, and for the UE in the network coverage, the node can make a sending request to the eNodeB and assign sending resources to the eNodeB, or autonomously select the sending resources to be used in a resource region (called scheduling resource pool/data resource pool) configured by the network and dedicated to sending the D2D control message and the D2D service message. After determining the resource sending position, the node firstly needs to broadcast the control message of the service message in the scheduling resource pool, declare the relevant control message of the service message, including the service message sending position and the like; the traffic message is then sent on the resource location indicated in the control message.
For the broadcast service message needing multi-hop forwarding, the relay UE receives the service message and repeats the broadcast message sending process after judging that the message needs forwarding. For the multi-hop broadcast service, the process of sending the service message messages among different nodes is independent. It has not been determined in V2X whether multi-hop forwarding behavior of various types of messages is supported. After the D2D communication mechanism is transplanted to the V2X field, the performance of the mechanism cannot meet the requirements of the V2X system due to the characteristics of the V2X system such as high node density, frequent periodic communication, and high moving speed, and needs to be enhanced.
Disclosure of Invention
In order to solve the above problem, the present invention provides a cooperative diversity application method in 3GPP V2X, including:
the V2X broadcast service initiator sends control message in the control resource pool, and then sends the data message in the data resource pool;
the control message and the data message are both possible to be retransmitted, and the control message carries scheduling information of the first transmission and the possible retransmission of the data message;
after the V2X broadcast service initiator sends a data broadcast message, each relay node forwards the data broadcast message in a cooperative diversity mode with a random phase difference, and the forwarding behavior includes forwarding first transmission and forwarding retransmission of data and/or control messages.
Further, the V2X broadcast service initiator also declares the forwarding level and/or forwarding authority of the data broadcast message and/or control message when sending the message.
Further, the forwarding classes include: no forwarding, retransmission forwarding, normal forwarding, a combination of retransmission forwarding and normal forwarding,
the behavior of the non-forwarding level includes: and the relay node does not forward the message after receiving the message.
The actions of the retransmission forwarding level include: the relay node forwards the data, the forwarding behavior is used as an auxiliary enhancement of the first sending behavior of the V2X broadcast service initiator, and the series first transmission and retransmission resources used by the forwarding behavior are overlapped with the series first transmission and retransmission resources used by the service initiator:
the behavior of the conventional forwarding level includes: the relay node forwards, the forwarding behavior and the first sending behavior of the V2X broadcast service initiator are independent two-time communication behaviors, and the series first transmission and retransmission resources used by the forwarding behavior are not overlapped with the series first transmission and retransmission resources used by the service initiator.
The combined level of retransmission forwarding and normal forwarding behavior includes: the relay node performs primary retransmission and primary conventional retransmission, and the series of primary transmission and retransmission resources used by the retransmission and retransmission behavior and the series of primary transmission and retransmission resources used by the conventional retransmission behavior can be overlapped or not overlapped; when resource overlapping occurs, single forwarding transmission is carried out on the resource, and two types of forwarding behaviors are considered to be completed on one resource.
Further, the forwarding class informs the relay node by means of a direct declaration, an indirect declaration, or a combination of both:
the direct declaration mode is realized by declaring the following information by the sending end node: an identification bit dedicated to identifying a forwarding class;
and the indirect declaration mode is jointly judged through the relay node parameters of the receiving end and the forwarding authority.
Further, the receiving-end relay node parameter is implemented by any combination of the following information:
the relay node attribute comprises Vehicle, Infrastructure, Peer, network side or any combination thereof;
a subordinate group of relay nodes;
location information of the relay node;
the geographical direction of travel of the relay node.
Further, the forwarding authority is realized by the sending end declaring any combination of the following information:
information related to the service type, including: a service attribute, a service priority, a service urgency, or any combination thereof of the message;
the attribute of the sending end node comprises Vehicle, Infrastructure, Pedestrian, a network side or any combination thereof;
the sending end node is a forwarding node or a service initiator;
the threshold value of the forwarding decision parameter comprises: a received power threshold, an RSRP measurement threshold, a received distance threshold, or any combination thereof;
a subordinate group of the message;
location information of an originating source node of the message;
a geographic direction of the forwarding behavior;
a maximum hop limit;
a network congestion condition.
Further, the mapping relationship between the forwarding level and the indirect declaration related information is configured by: pre-configured at the V2X relay node, or configured by relay node higher layers, or configured by V2X broadcast service originator, or configured by the network, or configured by other nodes within the network.
Further, the air conditioner is provided with a fan,
when configured by the network, the related information is carried in SIB message broadcast by eNodeB or carried in special signaling unicast by eNodeB,
the broadcast service configuration by the V2X originator or other nodes in the network is performed through newly defined V2X control information, or carried in the control message and/or data message of the service.
Further, still include:
when the V2X broadcast service initiator/relay node sends/forwards a data broadcast message, it also obtains the current hop count of the data broadcast message and the number of single-hop retransmissions under the current hop count;
the current hop count and the number of single-hop retransmissions under the current hop count are carried in the data broadcast message or in a control message corresponding to the data message.
Further, the current hop count is informed to the relay node by means of direct declaration, indirect declaration or a combination of the two,
the direct declaration mode is realized by declaration control of a sending end and/or hop number identification bits carried in a data message;
the indirect declaration mode is realized by mapping the time-frequency position of the transmission resource and/or the scrambling mode.
Further, the single-hop retransmission times are informed to the relay node through a direct declaration, an indirect declaration or a combination of the two methods,
the direct declaration mode is realized by the sending end declaring any combination of the following information: retransmission times identification bits carried in control and/or data messages;
the indirect declaration mode is obtained through a mapping relation by using any combination of the following information:
current hop count;
total business weight transmission times;
the first transmission and retransmission times completed by the current service initiator and/or each previous hop and/or the relay node of the previous hop;
the previous hop node is a service initiator or a relay node;
information related to the service type, including: a service attribute, a service priority, a service urgency, or any combination thereof of the message;
the node attributes of the sending end and/or the receiving end comprise Vehicle, Infrastructure, Peer, network side or any combination thereof;
a service initiator and/or a previous hop node and/or a subordinate group of each previous hop node;
a subordinate group of the message;
the threshold value of the forwarding decision parameter comprises: a received power threshold, an RSRP measurement threshold, a received distance threshold, or any combination thereof.
Further, still include: when the current hop count and the single-hop retransmission times use an indirect declaration mode, the association relationship between the hop count, the single-hop retransmission times and the information combination is configured in the following mode: pre-configured at the V2X relay node, or configured by relay node higher layers, or configured by V2X broadcast service originator, or configured by the network, or configured by other nodes within the network.
Further, still include:
when the V2X node receives the data broadcast message, if the forwarding level of the node is analyzed not to belong to non-forwarding, determining the time-frequency resource position used by the forwarding behavior, and under the scene that the control message corresponding to the data message needs to be sent, the V2X node also determines the sending resource position of the corresponding control message; the sending resource positions of the data information and the control information comprise time-frequency resource positions of forwarding first transmission and each time of forwarding retransmission.
Further, the resource location information is carried in the received data broadcast message and/or in the control message corresponding to the data message, and is directly declared by a field value or indirectly declared by a resource location of the broadcast message:
in the direct declaration, the multiplexing D2D specifies the mapping mechanism of the data resource location in the control message, or uses a new mapping mechanism;
in indirect declaration, the forwarding behavior is mapped to the sending resource location with a fixed criterion according to the receiving resource location, the current hop count, and the number of single-hop transmissions.
Further, the fixed criteria is UE-specific, UE communication group-specific, message type-specific, or cell-specific; pre-configured at the relay node, or configured by the relay node higher layer, or configured by the network, or configured by the V2X service originator, or configured by other nodes within the network.
Further, the scheduling information of the Data message carried in the control message is determined by the V2X broadcast service initiator before sending the Data broadcast message, or is requested to an eNodeB, and in the case of the request to the eNodeB, the scheduling information is carried in a control/Data Grant message sent by the eNodeB to the V2X broadcast service initiator;
the scheduling information comprises scheduling resources of the current sending or the current sending and relevant forwarding.
Further, the forwarding behavior of each relay node under a given hop count uses the same control resource and the same data resource, and the forwarding content is the same control message and data broadcast message.
Further, still include: when the forwarding level is retransmission forwarding or a combination of retransmission forwarding and conventional forwarding,
the relay node forwards the control message and/or the data message at the retransmission resource position of the V2X broadcast service initiator, and the forwarding behavior of the relay node cooperates with the retransmission sending behavior of the service initiator;
alternatively, the first and second electrodes may be,
the relay node forwards the data at other resource positions.
Further, the initiator of the V2X broadcast service includes: V2X node and/or network side.
Further, the forwarding applies to the periodic regular message CAM and the emergency trigger message DENM in V2X, and specifically includes: any combination of any number of types of emergency trigger messages and periodic regular messages.
The invention introduces the cooperative diversity technology into the field of V2X, enhances the existing D2D communication mechanism, improves the transmission reliability and the communication range of the communication message in the V2X system, and can be used as an auxiliary means for multi-service priority transmission.
Drawings
Fig. 1 is a topology diagram of a V2X node used in embodiment 1 of the present invention;
fig. 2 is a topology diagram of a V2X node used in embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
One embodiment of the present invention provides a cooperative diversity application method in 3GPP V2X, including:
the V2X broadcast service initiator sends control message in the control resource pool, and then sends the data message in the data resource pool;
the control message and the data message are both possible to be retransmitted, and the control message carries scheduling information of the first transmission and the possible retransmission of the data message;
after the V2X broadcast service initiator sends a data broadcast message, each relay node forwards the data broadcast message in a cooperative diversity mode with a random phase difference, and the forwarding behavior includes forwarding first transmission and forwarding retransmission of data and/or control messages.
In an alternative embodiment, the V2X broadcast service originator also declares the forwarding level and/or forwarding authority of the data broadcast message and/or control message when sending the message.
In an alternative embodiment, the forwarding classes include: no forwarding, retransmission forwarding, normal forwarding, a combination of retransmission forwarding and normal forwarding; the behavior of the non-forwarding level includes: the relay node does not forward the message after receiving the message; the actions of the retransmission forwarding level include: the relay node forwards the data, the forwarding behavior is used as auxiliary enhancement of the first sending behavior of the V2X broadcast service initiator, and series first transmission and retransmission resources used by the forwarding behavior are overlapped with series first transmission and retransmission resources used by the service initiator; the behavior of the conventional forwarding level includes: the relay node forwards the data, the forwarding behavior and the first sending behavior of the V2X broadcast service initiator are independent two-time communication behaviors, and series first transmission and retransmission resources used by the forwarding behavior are not overlapped with series first transmission and retransmission resources used by the service initiator; the combined level of retransmission forwarding and normal forwarding behavior includes: the relay node performs primary retransmission and primary conventional retransmission, and the series of primary transmission and retransmission resources used by the retransmission and retransmission behavior and the series of primary transmission and retransmission resources used by the conventional retransmission behavior can be overlapped or not overlapped; when resource overlapping occurs, single forwarding transmission is carried out on the resource, and two types of forwarding behaviors are considered to be completed on one resource.
In an optional embodiment, the forwarding class informs the relay node by means of a direct declaration, an indirect declaration, or a combination of both: the direct declaration mode is realized by declaring the following information by the sending end node: an identification bit dedicated to identifying a forwarding class; and the indirect declaration mode is jointly judged through the relay node parameters of the receiving end and the forwarding authority.
In an alternative embodiment, the receiver-side relay node parameter is implemented by any combination of the following information:
the relay node attribute comprises Vehicle, Infrastructure, Peer, network side or any combination thereof;
a subordinate group of relay nodes;
location information of the relay node;
the geographical direction of travel of the relay node.
In an alternative embodiment, the forwarding authority is implemented by the sender declaring any combination of the following information:
information related to the service type, including: a service attribute, a service priority, a service urgency, or any combination thereof of the message;
the attribute of the sending end node comprises Vehicle, Infrastructure, Pedestrian, a network side or any combination thereof;
the sending end node is a forwarding node or a service initiator;
the threshold value of the forwarding decision parameter comprises: a received power threshold, an RSRP measurement threshold, a received distance threshold, or any combination thereof;
a subordinate group of the message;
location information of an originating source node of the message;
a geographic direction of the forwarding behavior;
a maximum hop limit;
a network congestion condition.
In an optional embodiment, the mapping relationship between the forwarding level and the indirect declaration related information is configured by: pre-configured at the V2X relay node, or configured by relay node higher layers, or configured by V2X broadcast service originator, or configured by the network, or configured by other nodes within the network.
In an optional embodiment, when configured by the network, the relevant information is carried in an SIB message broadcast by the eNodeB or carried in dedicated signaling unicast by the eNodeB; the broadcast service configuration by the V2X originator or other nodes in the network is performed through newly defined V2X control information, or carried in the control message and/or data message of the service.
In an optional embodiment, further comprising: when the V2X broadcast service initiator/relay node sends/forwards a data broadcast message, it also obtains the current hop count of the data broadcast message and the number of single-hop retransmissions under the current hop count; the current hop count and the number of single-hop retransmissions under the current hop count are carried in the data broadcast message or in a control message corresponding to the data message.
In an optional embodiment, the current hop count is notified to the relay node by a direct declaration, an indirect declaration, or a combination of both; the direct declaration mode is realized by declaration control of a sending end and/or hop number identification bits carried in a data message; the indirect declaration mode is realized by mapping the time-frequency position of the transmission resource and/or the scrambling mode.
In an optional embodiment, the number of single-hop retransmissions is notified to the relay node by a direct declaration, an indirect declaration, or a combination of both;
the direct declaration mode is realized by the sending end declaring any combination of the following information: retransmission times identification bits carried in control and/or data messages;
the indirect declaration mode is obtained through a mapping relation by using any combination of the following information:
current hop count;
total business weight transmission times;
the first transmission and retransmission times completed by the current service initiator and/or each previous hop and/or the relay node of the previous hop;
the previous hop node is a service initiator or a relay node;
information related to the service type, including: a service attribute, a service priority, a service urgency, or any combination thereof of the message;
the node attributes of the sending end and/or the receiving end comprise Vehicle, Infrastructure, Peer, network side or any combination thereof;
a service initiator and/or a previous hop node and/or a subordinate group of each previous hop node;
a subordinate group of the message;
the threshold value of the forwarding decision parameter comprises: a received power threshold, an RSRP measurement threshold, a received distance threshold, or any combination thereof.
In an optional embodiment, further comprising: when the current hop count and the single-hop retransmission times use an indirect declaration mode, the association relationship between the hop count, the single-hop retransmission times and the information combination is configured in the following mode: pre-configured at the V2X relay node, or configured by relay node higher layers, or configured by V2X broadcast service originator, or configured by the network, or configured by other nodes within the network.
In an optional embodiment, further comprising: when the V2X node receives the data broadcast message, if the forwarding level of the node is analyzed not to belong to non-forwarding, determining the time-frequency resource position used by the forwarding behavior, and under the scene that the control message corresponding to the data message needs to be sent, the V2X node also determines the sending resource position of the corresponding control message; the sending resource positions of the data information and the control information comprise time-frequency resource positions of forwarding first transmission and each time of forwarding retransmission.
In an optional embodiment, the resource location information is carried in the received data broadcast message and/or in a control message corresponding to the data message, and is directly declared by a field value or indirectly declared by a resource location of the broadcast message: in the direct declaration, the multiplexing D2D specifies the mapping mechanism of the data resource location in the control message, or uses a new mapping mechanism; in indirect declaration, the forwarding behavior is mapped to the sending resource location with a fixed criterion according to the receiving resource location, the current hop count, and the number of single-hop transmissions.
In an alternative embodiment, the fixed criterion is UE-specific, UE communication group-specific, message type-specific, or cell-specific; pre-configured at the relay node, or configured by the relay node higher layer, or configured by the network, or configured by the V2X service originator, or configured by other nodes within the network.
In an optional embodiment, the scheduling information of the Data message carried in the control message is determined by the V2X broadcast service initiator before sending the Data broadcast message, or is requested from the eNodeB, and in the case of the request from the eNodeB, the scheduling information is carried in the control/Data Grant message sent by the eNodeB to the V2X broadcast service initiator; the scheduling information comprises scheduling resources of the current sending or the current sending and relevant forwarding.
In an alternative embodiment, the forwarding behavior of each relay node at a given hop count uses the same control resource and the same data resource, and the forwarding content is the same control message and data broadcast message.
In an optional embodiment, further comprising: when the forwarding level is retransmission forwarding or a combination of retransmission forwarding and conventional forwarding, the relay node forwards the control message and/or the data message at a retransmission resource position of a V2X broadcast service initiator, and the forwarding behavior of the relay node cooperates with the sending and retransmission behavior of the service initiator; or the relay node forwards the data at other resource positions.
In an alternative embodiment, the initiator of the V2X broadcast service includes: V2X node and/or network side.
In an alternative embodiment, the forwarding applies to the periodic regular message CAM and the emergency trigger message DENM in V2X, and specifically includes: any combination of any number of types of emergency trigger messages and periodic regular messages.
The enodebs mentioned in the above embodiments may also be replaced by V2X infrastructure in a V2X communication system, and the broadcast messages mentioned above are also applicable to the case of multicast messages.
In the embodiments, the relay node assists the source node to perform blind retransmission in a cooperative diversity manner, and cooperative forwarding is used as an enhancement measure for the blind retransmission of the message of the source node, so that the purpose of improving the QoS performance of the service message is achieved on the premise that parameters such as resource occupation and time delay are not changed.
Example one
The V2X node topology employed in the present embodiment is shown in fig. 1.
1. The UE1 generates an emergency stop Message1 needing broadcast flooding, multiplexes a D2D communication mechanism, and makes a transmission request to an eNodeB; the eNodeB sends the SA Grant and the Data Grant to the UE1, carries scheduling information, and specifies the time-frequency resource position used by each hop in the multi-hop forwarding process in the scheduling information;
2. the UE1 resolves that the first hop SA and the data retransmission times of the emergency stop type service message are both 1 time according to the local pre-configuration information; the UE1 carries out the first transmission of a scheduling Message SA1 corresponding to the Message1 according to the resource scheduling of the eNodeB (SA1A), and states that the Message type of the Message1 is emergency stop and the maximum hop count is 2 hops (the 3 rd hop node stops forwarding) by using a field identification bit in SA 1A;
3. the UE2/UE3/UE4/UE5 receives SA1A and resolves the receiving position of Message 1; analyzing the forwarding level of the emergency stop type service message as retransmission forwarding according to the local pre-configuration information, wherein the retransmission times of the forwarding node is 0 time, namely only forwarding first transmission is carried out, and forwarding retransmission is not carried out; judging that SA1A is 1-hop first-pass according to a resource position mapping relation preset locally; determining that retransmission forwarding should be sent on a resource position of the first retransmission of the UE1 by using a mapping relation preconfigured locally according to the fact that the local current hop count is 2 hops;
4. the UE1 calculates the first retransmission (SA1B) resource position according to the first transmission (SA1A) resource position according to the locally pre-configured resource position mapping relation; the UE2/UE3/UE4/UE5 calculates the SA resource position to be used by the UE1 for the first retransmission (SA1B) by using the mapping relation pre-configured locally according to the receiving resource position of SA1A and the first transmission of SA 1A; the UE1/UE2/UE3/UE4/UE5 sends SA1B on the same resource position, and the SA1B and SA1A have the same content;
5. the UE6/UE7/UE8 receives SA1B and resolves the receiving position of the Message 1; judging that the SA1B is 1-hop retransmission + 2-hop first transmission according to a resource position mapping relation preset locally; judging whether the forwarding grade is non-forwarding according to the fact that the current local hop count is 3 hops and the maximum hop count is 2 hops;
6. the UE1 makes the first transmission of Message1 (Message1A) according to the eNodeB's resource schedule; the UE2/UE3/UE4/UE5 receives the Message1A, determines that the forwarding first transmission is transmitted on the resource position of the first retransmission of the UE1 by using the mapping relation pre-configured locally according to the local current hop count being 2 hops;
7. the UE1 calculates the first retransmission (Message1B) resource position according to the first transmission (Message1A) resource position according to the locally pre-configured resource position mapping relation; the UE2/UE3/UE4/UE5 calculates the data resource position to be used by the UE1 for the first retransmission (Message1B) by using a mapping relation pre-configured locally according to the receiving resource position of the Message1A and the Message1A as the first transmission; UE1/UE2/UE3/UE4/UE5 send Message1B on the same resource position, and the content of the Message1B is completely the same as that of Message 1A;
8. UE6/UE7/UE8 receives Message1B and does not forward any more; the broadcast flooding process ends.
Example two
The V2X node topology employed in this embodiment is shown in fig. 2. In the figure, UE 1-UE 8 are all vessel type nodes.
1. The UE1 generates an emergency stop Message1 needing broadcast flooding, multiplexes a D2D communication mechanism, and makes a transmission request to an eNodeB; the eNodeB sends the SA Grant and the Data Grant to the UE1, carries scheduling information, and specifies the time-frequency resource position used by each hop in the multi-hop forwarding process in the scheduling information;
2. the UE1 resolves that the first hop SA and the data retransmission times of the emergency stop type service message are both 1 time according to the local pre-configuration information; the UE1 carries out the first transmission of a scheduling Message SA1 corresponding to the Message1 according to the resource scheduling of the eNodeB (SA1A), the Message type of the Message1 is declared to be emergency stop by using a field identification bit in SA1A, the geographical position information of the UE1 is declared, the receiving distance threshold is declared, and the total number of times of current service total retransmission is declared to be 0;
3. the UE2/UE3/UE4/UE5 receives SA1A and resolves the receiving position of Message 1; according to the local geographical position information and the received geographical position information of the UE1, judging that the distance from the service source node is smaller than a receiving distance threshold value, and judging that the forwarding level is not forwarded; resolving that the emergency stop type service message belongs to aperiodic trigger messages according to local pre-configuration information, wherein the forwarding level of the message is retransmitted and forwarded by a vessel type node, and the retransmission times of the forwarding node is 1 time; determining a resource position corresponding to the total weight transmission times of the service for the first local forwarding use as 1 by using a mapping relation pre-configured locally according to the total weight transmission times of the received service as 0;
4. the UE1 calculates the resource location of the first retransmission (SA1B), namely the 1 st service total retransmission (SA1 3526), according to the resource location mapping relationship pre-configured locally and according to the resource location of the first transmission, namely the 0 th service total retransmission (SA 1A); the UE2/UE3/UE4/UE5 calculates the SA resource position to be used by the 1 st total service retransmission (SA1B) by using the mapping relation pre-configured locally according to the receiving resource position of the 0 th total service retransmission SA 1A; the UE1/UE2/UE3/UE4/UE5 sends SA1B on the same resource position, and the SA1B and SA1A have the same content;
5. the UE2/UE3/UE4/UE5 calculates the SA resource position to be used by the 2 nd total service retransmission (SA1C) by using the mapping relation pre-configured locally according to the sending resource position of the 1 st total service retransmission SA 1B; the UE2/UE3/UE4/UE5 sends SA1C on the same resource position, and SA1C and SA1A have the same content;
6. the UE6/UE7/UE8 receives SA1B and SA1C and resolves the receiving position of the Message 1; according to the local geographical position information and the received geographical position information of the UE1, judging that the distance from the service source node is greater than a receiving distance threshold value, and judging that the forwarding grade is not forwarding;
7. the UE1 makes the first transmission of Message1 (Message1A) according to the eNodeB's resource schedule; UE2/UE3/UE4/UE5 received Message 1A;
8. the UE1 calculates the first retransmission (Message1B) resource position according to the first transmission (Message1A) resource position according to the locally pre-configured resource position mapping relation; the UE2/UE3/UE4/UE5 determines the resource position corresponding to the number of times of forwarding the first transmission, namely the total transmission of the next service, by using a mapping relation pre-configured locally according to the receiving resource position of the Message 1A; UE1/UE2/UE3/UE4/UE5 send Message1B on the same resource position, and the content of the Message1B is completely the same as that of Message 1A;
9. the UE2/UE3/UE4/UE5 calculates the SA resource position to be used by the next total service retransmission (Message1C) by using the mapping relation pre-configured locally according to the sending resource position of the Message 1B; UE2/UE3/UE4/UE5 sends Message1C at the same resource position, and Message1C and Message1A have the same content;
10. UE6/UE7/UE8 receives Message1B and Message1C and does not forward any more; the broadcast flooding process ends.
The invention provides an implementation scheme for sending data information in a V2X communication system by combining a cooperative diversity thought, which can realize efficient, reliable and easy-to-implement service message broadcast flooding under the scenes and requirement standards of high density of nodes, low time delay requirement, information transmission reliability requirement and the like, and can improve the performance of QoS (quality of service) performances such as the reliability, the transmission range and the like of partial important or emergency services by adjusting the application range of the implementation scheme.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (19)
1. A method for cooperative diversity application in 3GPP V2X, comprising:
the V2X broadcast service initiator sends control message in the control resource pool, and then sends data message in the data resource pool;
the control message and the data message are both possible to be retransmitted, and the control message carries scheduling information of the first transmission and the possible retransmission of the data message;
after the V2X broadcast service initiator sends a data broadcast message, each relay node forwards the data broadcast message in a cooperative diversity mode with random phase difference, and the forwarding behavior comprises forwarding first transmission and forwarding retransmission of data and/or control messages;
when the V2X broadcast service initiator/relay node sends/forwards a data broadcast message, it also obtains the current hop count of the data broadcast message and the number of single-hop retransmissions under the current hop count;
the current hop count and the number of single-hop retransmissions under the current hop count are carried in the data broadcast message or in a control message corresponding to the data message.
2. The method of claim 1, wherein the V2X broadcast service originator further declares the forwarding level and/or forwarding authority of the data broadcast message and/or control message when sending the message.
3. The method of claim 2, wherein the forwarding class comprises: no forwarding, retransmission forwarding, normal forwarding, a combination of retransmission forwarding and normal forwarding,
the behavior of the non-forwarding level includes: the relay node does not forward the message after receiving the message;
the actions of the retransmission forwarding level include: the relay node forwards the data, the forwarding behavior is used as auxiliary enhancement of the first sending behavior of the V2X broadcast service initiator, and series first transmission and retransmission resources used by the forwarding behavior are overlapped with series first transmission and retransmission resources used by the service initiator;
the behavior of the conventional forwarding level includes: the relay node forwards the data, the forwarding behavior and the first sending behavior of the V2X broadcast service initiator are independent two-time communication behaviors, and series first transmission and retransmission resources used by the forwarding behavior are not overlapped with series first transmission and retransmission resources used by the service initiator;
the combined level of retransmission forwarding and normal forwarding behavior includes: the relay node performs primary retransmission and primary conventional retransmission, and the series of primary transmission and retransmission resources used by the retransmission and retransmission behavior and the series of primary transmission and retransmission resources used by the conventional retransmission behavior can be overlapped or not overlapped; when resource overlapping occurs, single forwarding transmission is carried out on the resource, and two types of forwarding behaviors are considered to be completed on one resource.
4. The method of claim 3, wherein the forwarding class informs the relay node by a direct declaration, an indirect declaration, or a combination thereof:
the direct declaration mode is realized by declaring the following information by the sending end node: an identification bit dedicated to identifying a forwarding class;
and the indirect declaration mode is jointly judged through the relay node parameters of the receiving end and the forwarding authority.
5. The method of claim 4, wherein the receiving-end relay node parameter is implemented by any combination of the following information:
the relay node attribute comprises Vehicle, Infrastructure, Peer, network side or any combination thereof;
a subordinate group of relay nodes;
location information of the relay node;
the geographical direction of travel of the relay node.
6. The method of claim 4, wherein the forwarding authority is implemented by the sender declaring any combination of the following information:
information related to the service type, including: a service attribute, a service priority, a service urgency, or any combination thereof of the message;
the attribute of the sending end node comprises Vehicle, Infrastructure, Pedestrian, a network side or any combination thereof;
the sending end node is a forwarding node or a service initiator;
the threshold value of the forwarding decision parameter comprises: a received power threshold, an RSRP measurement threshold, a received distance threshold, or any combination thereof;
a subordinate group of the message;
location information of an originating source node of the message;
a geographic direction of the forwarding behavior;
a maximum hop limit;
a network congestion condition.
7. The method of claim 4, wherein the mapping relationship between the forwarding class and the indirect declaration related information is configured by: pre-configured at the V2X relay node, or configured by relay node higher layers, or configured by V2X broadcast service originator, or configured by the network, or configured by other nodes within the network.
8. The method of claim 7,
when configured by the network, the related information is carried in SIB message broadcast by eNodeB or carried in special signaling unicast by eNodeB,
the broadcast service configuration by the V2X originator or other nodes in the network is performed through newly defined V2X control information, or carried in the control message and/or data message of the service.
9. The method of claim 1, wherein the current hop count is signaled to a relay node by a direct declaration, an indirect declaration, or a combination thereof,
the direct declaration mode is realized by declaration control of a sending end and/or hop number identification bits carried in a data message;
the indirect declaration mode is realized by mapping the time-frequency position of the transmission resource and/or the scrambling mode.
10. The method of claim 1, wherein the number of single-hop retransmissions is signaled to a relay node by a direct declaration, an indirect declaration, or a combination thereof,
the direct declaration mode is realized by the sending end declaring any combination of the following information: retransmission times identification bits carried in control and/or data messages;
the indirect declaration mode is obtained through a mapping relation by using any combination of the following information:
current hop count;
total business weight transmission times;
the first transmission and retransmission times completed by the current service initiator and/or each previous hop and/or the relay node of the previous hop;
the previous hop node is a service initiator or a relay node;
information related to the service type, including: a service attribute, a service priority, a service urgency, or any combination thereof of the message;
the node attributes of the sending end and/or the receiving end comprise Vehicle, Infrastructure, Peer, network side or any combination thereof;
a service initiator and/or a previous hop node and/or a subordinate group of each previous hop node;
a subordinate group of the message;
the threshold value of the forwarding decision parameter comprises: a received power threshold, an RSRP measurement threshold, a received distance threshold, or any combination thereof.
11. The method of claim 9 or 10, further comprising: when the current hop count and the single-hop retransmission times use an indirect declaration mode, the association relationship between the hop count, the single-hop retransmission times and the information combination is configured in the following mode: pre-configured at the V2X relay node, or configured by relay node higher layers, or configured by V2X broadcast service originator, or configured by the network, or configured by other nodes within the network.
12. The method of claim 2, further comprising:
when the V2X node receives the data broadcast message, if the forwarding level of the node is analyzed not to belong to non-forwarding, determining the time-frequency resource position used by the forwarding behavior, and under the scene that the control message corresponding to the data message needs to be sent, the V2X node also determines the sending resource position of the corresponding control message; the sending resource positions of the data information and the control information comprise time-frequency resource positions of forwarding first transmission and each time of forwarding retransmission.
13. The method of claim 12, wherein the resource location information is carried in the received data broadcast message and/or in a control message corresponding to the data message, and is directly declared by a field value or indirectly declared by a resource location of the broadcast message:
in the direct declaration, the multiplexing D2D specifies the mapping mechanism of the data resource location in the control message, or uses a new mapping mechanism;
in indirect declaration, the forwarding behavior is mapped to the sending resource location with a fixed criterion according to the receiving resource location, the current hop count, and the number of single-hop transmissions.
14. The method of claim 13, wherein the fixed criteria is UE-specific, UE communication group-specific, message type-specific, or cell-specific; pre-configured at the relay node, or configured by the relay node higher layer, or configured by the network, or configured by the V2X service originator, or configured by other nodes within the network.
15. The method of claim 1, wherein the scheduling information of the Data message carried in the control message is determined by the V2X broadcast service originator itself before sending the Data broadcast message or requested from an eNodeB, in which case the scheduling information is carried in a control/Data Grant message sent by an eNodeB to the V2X broadcast service originator;
the scheduling information comprises scheduling resources of the current sending or the current sending and relevant forwarding.
16. The method of claim 1, wherein the forwarding comprises: the forwarding behaviors of the relay nodes under the given hop count use the same control resource and the same data resource, and the forwarding contents are the same control message and data broadcast message.
17. The method of claim 2, further comprising: when the forwarding level is retransmission forwarding or a combination of retransmission forwarding and conventional forwarding,
the relay node forwards the control message and/or the data message at the retransmission resource position of the V2X broadcast service initiator, and the forwarding behavior of the relay node cooperates with the retransmission sending behavior of the service initiator;
alternatively, the first and second electrodes may be,
the relay node forwards the data at other resource positions.
18. The method of claim 1, wherein the originator of the V2X broadcast service comprises: V2X node and/or network side.
19. The method according to claim 1, wherein said forwarding of periodic regular messages CAM and emergency trigger messages DENM applied in V2X specifically comprises: any combination of any number of types of emergency trigger messages and periodic regular messages.
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| CN109474913B (en) * | 2017-09-06 | 2021-01-15 | 中国移动通信有限公司研究院 | Multi-hop transmission method and device |
| CN111147202A (en) * | 2018-11-02 | 2020-05-12 | 电信科学技术研究院有限公司 | Data transmission method, sending terminal and network side equipment of Internet of vehicles |
| CN113596804B (en) * | 2020-04-30 | 2022-07-08 | 维沃移动通信有限公司 | State indication method, device and system |
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