CN111132069B - Data transmission method and device, storage medium and terminal - Google Patents
Data transmission method and device, storage medium and terminal Download PDFInfo
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- CN111132069B CN111132069B CN201811276472.4A CN201811276472A CN111132069B CN 111132069 B CN111132069 B CN 111132069B CN 201811276472 A CN201811276472 A CN 201811276472A CN 111132069 B CN111132069 B CN 111132069B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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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
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Abstract
A data transmission method and device, a storage medium and a terminal, wherein the method comprises the following steps: determining the association relation between at least one candidate coverage range level and data transmission parameters; selecting a preferred coverage level from the at least one candidate coverage level according to a preset reference index; and transmitting the data according to the data transmission parameters associated with the preferred coverage range level. The scheme provided by the invention can solve the signal coverage problem of different services or transmission types, can effectively cover the receiving terminal in the transmission range of the signal, reduces the interference to other data transmission and improves the QoS of NR V2X.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a data transmission method and apparatus, a storage medium, and a terminal.
Background
The existing long term evolution (Long Term Evolution, abbreviated as LTE) vehicle to external information exchange (V2X, abbreviated as V2X, also called vehicle to everything) obtains transmission resources in two modes, one is a scheduling resource mode, which can be called mode3 (mode 3); the other is that the terminal automatically selects a mode, which may be referred to as mode4 (mode 4).
New Radio, NR, also called New air interface, V2X is being studied as a key technical direction of Release 16 (R16) version of the protocol. The NR V2X as an enhancement of LTE V2X technology is a key technical means to enable vehicular networking. NR V2X communication has mainly two ports, one is a PC5 port and the other is a Uu port. Wherein the PC5 port is an interface between two terminals. The V2X communication terminal may be a network, a vehicle, a pedestrian, an infrastructure such as a Road Side Unit (RSU) or the like. Thus, the communication types of V2X may include vehicle-to-vehicle (Vehicle to Vehicle, V2V for short), vehicle-to-infrastructure (Vehicle to Infrastructure, V2I for short), vehicle-to-pedestrian (Vehicle to Pedestrian, V2P for short) and vehicle-to-network (Vehicle to Network, V2N for short).
In NR V2X direct link (also referred to as a link) communication, there are three data transmission modes of unicast, multicast and broadcast. How to ensure effective coverage of signals in these three transmission modes is a problem to be solved.
Disclosure of Invention
The technical problem solved by the invention is how to more reasonably optimize the signal coverage of data transmission so as to improve the QoS of NR V2X.
In order to solve the above technical problems, an embodiment of the present invention provides a data transmission method, including: determining the association relation between at least one candidate coverage range level and data transmission parameters; selecting a preferred coverage level from the at least one candidate coverage level according to a preset reference index; and transmitting the data according to the data transmission parameters associated with the preferred coverage range level.
Optionally, the selecting a preferred coverage level from the at least one candidate coverage level according to a preset reference index includes: and determining the preferred coverage level from the at least one candidate coverage level according to at least one or more parameters of the service type of the data, the QoS level, the transmission mode of the data, the moving speed of the terminal and the like.
Optionally, the association relation between the candidate coverage level and the data transmission parameter is obtained through broadcasting, proprietary signaling and/or pre-configuration.
Optionally, the association between the candidate coverage level and the data transmission parameter includes: the larger the coverage corresponding to the candidate coverage class, the greater the transmit power of the data and/or the lower the transmission frequency.
Optionally, the data transmission parameter is selected from: transmit power, MCS, and transmission frequency.
Optionally, the data is data of V2X service.
In order to solve the above technical problem, an embodiment of the present invention further provides a data transmission device, including: the determining module is used for determining the association relation between at least one candidate coverage range grade and the data transmission parameters; the selection module is used for selecting a preferred coverage range grade from the at least one candidate coverage range grade according to a preset reference index; and the transmission module is used for transmitting the data according to the data transmission parameters associated with the preferred coverage range class.
Optionally, the selecting module includes: and the determining submodule is used for determining the preferred coverage range level from the at least one candidate coverage range level at least according to one or more parameters of the service type, the QoS level, the data transmission mode and the moving speed of the terminal.
To solve the above technical problem, an embodiment of the present invention further provides a storage medium having stored thereon computer instructions that execute the steps of the above method when the computer instructions are run.
In order to solve the technical problem, the embodiment of the invention also provides a terminal, which comprises a memory and a processor, wherein the memory stores computer instructions capable of running on the processor, and the processor executes the steps of the method when running the computer instructions.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a data transmission method, which comprises the following steps: determining the association relation between at least one candidate coverage range level and data transmission parameters; selecting a preferred coverage level from the at least one candidate coverage level according to a preset reference index; and transmitting the data according to the data transmission parameters associated with the preferred coverage range level. Compared with the prior art, the scheme of the embodiment optimizes the signal coverage according to the preset parameter index, can fully consider the influence of different services or transmission types on the signal coverage, and reduces the interference on other data transmission and improves the QoS of NR V2X while ensuring that the signal transmission range can effectively cover the receiving terminal.
Further, the association relationship between the candidate coverage class and the data transmission parameter includes: the larger the coverage corresponding to the candidate coverage class, the greater the transmit power of the data and/or the lower the transmission frequency. Thus, the signal coverage of the transmitting terminal for data transmission can be ensured to effectively cover the receiving terminal, and the QoS of NR V2X can be improved.
Drawings
FIG. 1 is a flow chart of a data transmission method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a data transmission device according to an embodiment of the present invention.
Detailed Description
As will be appreciated by those skilled in the art, as the background art implies, existing data transmission schemes do not guarantee an efficient coverage of signals in NR V2X scenarios.
In order to solve the above technical problems, an embodiment of the present invention provides a data transmission method, including: determining the association relation between at least one candidate coverage range level and data transmission parameters; selecting a preferred coverage level from the at least one candidate coverage level according to a preset reference index; and transmitting the data according to the data transmission parameters associated with the preferred coverage range level.
It is understood by those skilled in the art that the scheme of the present embodiment optimizes the signal coverage according to the preset parameter index, and can fully consider the influence of different services or transmission types on the signal coverage, so as to reduce interference on other data transmission and improve the quality of service (Quality of Service, qoS for short) of NR V2X while ensuring that the signal transmission range can effectively cover the receiving terminal.
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart of a data transmission method according to an embodiment of the present invention. The scheme of the embodiment can be applied to a car networking scene, such as NR V2X, and by executing the scheme of the embodiment, the sending terminal can reasonably adjust data transmission parameters according to factors such as service types, transmission types and the like so as to ensure effective coverage of the receiving terminal.
The scheme of the embodiment can be applied to other data transmission scenes needing to optimize the effective coverage effect of the signal.
Specifically, referring to fig. 1, the data transmission method according to the present embodiment may include the following steps:
step S101, determining the association relation between at least one candidate coverage range level and data transmission parameters;
step S102, selecting a preferred coverage level from the at least one candidate coverage level according to a preset reference index;
step S103, transmitting the data according to the data transmission parameters associated with the preferred coverage range level.
More specifically, the larger the coverage area corresponding to the candidate coverage area level, the better the data transmission effect corresponding to the data transmission parameter. Thus, the signal coverage of the transmitting terminal for data transmission can be ensured to effectively cover the receiving terminal, and the QoS of NR V2X can be improved.
In one non-limiting embodiment, the data transmission parameter may be selected from: transmit power, modulation and coding strategy (Modulation and Coding Scheme, MCS for short) and transmission frequency. It will be appreciated that in practical applications, the data transmission parameters may also include other parameters that can affect the reliability of the transmission of data.
In a preferred embodiment, the larger the coverage range corresponding to the candidate coverage range level is, the larger the transmission power of the data is and/or the lower the transmission frequency is, so as to ensure that the receiving terminals in the corresponding coverage range can successfully receive the data transmitted by the transmitting terminal.
In one non-limiting embodiment, at least one candidate coverage class may be pre-partitioned and associated data transmission parameters determined to ensure that data transmitted using a particular data transmission parameter is efficiently transmitted to all peers within a signal coverage (which may simply be referred to as coverage) corresponding to the particular candidate coverage class.
For example, three candidate coverage levels may be determined, where the first candidate coverage level corresponds to a coverage of 500 meters, the second candidate coverage level corresponds to a coverage of 1000 meters, and the third candidate coverage level corresponds to a coverage of 1500 meters.
When the minimum coverage required by the data transmission is 800 m according to the preset reference index, a second candidate coverage level can be determined to be the preferred coverage level, and the data is transmitted according to the data transmission parameters associated with the second candidate coverage level.
In one non-limiting embodiment, the step S101 may include: and determining the association relation between the at least one candidate coverage level and the data transmission parameters according to whether the at least one candidate coverage level is in the coverage range of the base station signal so as to determine the data transmission parameters associated with the more proper preferred coverage level in the subsequent steps.
Specifically, the base station may preconfigure the association relationship between the at least one candidate coverage level and the data transmission parameter, and send the association relationship by broadcasting or proprietary signaling.
When the terminal is within the signal coverage of the base station, the association relationship between the at least one candidate coverage level configured by the base station through broadcasting or proprietary signaling and the data transmission parameter may be received, and the step S102 and the step S103 may be performed based on the association relationship.
Further, the terminal may store the received association relationship between the at least one candidate coverage class and the data transmission parameter. When a terminal requiring data transmission is out of the signal coverage of the base station, the terminal may preferably perform the steps S102 and S103 using the stored association relationship between the at least one candidate coverage class and the data transmission parameter.
Therefore, even if the terminal is out of the signal coverage range of the base station, the proper association relation can be determined, further, more proper data transmission parameters are determined when data transmission is needed, the transmitted data can be ensured to be timely and accurately transmitted to the receiving terminal, and the reliability of the NR V2X user is improved.
In one non-limiting embodiment, different base stations, such as base stations belonging to different operators, may be configured with different associations of at least one candidate coverage class with data transmission parameters.
When the terminal generates a data transmission requirement during the movement from the base station 1 to the base station 2, the terminal may preferably receive the association relationship between at least one candidate coverage class configured by the base station 2 and the data transmission parameter, and perform the steps S102 and S103 based on this.
If the terminal cannot successfully receive the association relationship between the at least one candidate coverage class configured by the base station 2 and the data transmission parameter, the terminal may execute the step S102 and the step S103 according to the association relationship between the at least one candidate coverage class configured by the base station 1 and the data transmission parameter received during the residence in the base station 1.
In one non-limiting embodiment, the preset reference index may be selected from: the traffic type of the data, the moving speed of the terminal, the QoS class (which may also be called QoS parameter), and the transmission mode (which may also be called transmission type) of the data.
Further, the step S102 may include: and determining the preferred coverage range level from the at least one candidate coverage range level at least according to one or more parameters of the service type, the QoS level, the data transmission mode and the moving speed of the terminal.
In one non-limiting embodiment, the data transmission parameter may be selected from: transmit power, MCS, and transmission frequency.
For example, the transmit power may also be referred to as transmit power, which may be a minimum transmit power.
For example, the transmission frequency may be frequency information where a transmission resource for transmitting the data is located.
In one non-limiting embodiment, the data may be data of V2X traffic.
Specifically, the service type may be selected from: service identification (Provider Service Identifier, PSID for short), intelligent transportation system identification (Intelligent Transportation System Identifier, ITS-ID for short) or Destination identification (Destination ID).
Further, different service types may be applied to different V2X application scenarios, and the effective coverage of the signals required by different service types may also be different. Thus, the requirements of different V2X application scenarios for signal coverage may also be different.
For example, in an autopilot scenario, the minimum communication range required by two terminals in case of emergency trajectory alignment is 500m; in a fleet scenario, the minimum communication range required in the highest automation case is 80m; in the extended sensor scenario, the minimum communication range required in the case of low degree of automation is 1000m. Therefore, the corresponding preferable signal coverage range grade can be reasonably determined, and further, the proper data transmission parameters can be determined.
Specifically, the QoS parameters may include parameters such as delay, reliability, priority, and the like, and may further include a transmission rate. Different QoS requirements may correspond to different minimum communication range requirements, so that appropriate transmit power and frequency information may be determined based on QoS parameters.
For example, a data transmission scenario with less latency and reliability requirements may correspond to a lower preferred signal coverage level, and thus to a smaller coverage, associated data transmission parameters such as transmit power may be less.
Specifically, the higher the moving speed of the terminal, the worse the doppler effect, and the worse the channel condition, the transmit power needs to be adjusted upward to ensure that the data transmitted by the transmitting terminal can be successfully transmitted to the receiving terminal.
Specifically, the NR V2X service may support three transmission types, broadcast, unicast, and multicast, and the requirements of the three on signal coverage may be different. For example, in a multicast scenario, it is required to ensure that all terminals in the multicast group can receive data; in a broadcasting scene, a certain coverage area is required to be ensured according to service requirements; in the unicast scene, the opposite terminal needs to be ensured to successfully receive the transmitted data.
Thus, for a specific transmission type, a preferred coverage level, and thus a suitable data transmission parameter, can be determined in a targeted manner.
By adopting the scheme of the embodiment, the signal coverage area is optimized according to the preset parameter index, the influence of different services or transmission types on the signal coverage area can be fully considered, the transmission range of the signal can be ensured to effectively cover the receiving terminal, the interference on other data transmission is reduced, and the QoS of NR V2X is improved.
Specifically, the base station may configure at least one candidate coverage class and associated data transmission parameters, and issue the association relationship to each terminal through broadcasting or proprietary signaling. When a data transmission requirement is generated, the terminal may determine a preferred coverage level according to its traffic type, transmission mode (which may also be referred to as transmission type), moving speed, etc. And then, the physical layer of the terminal can determine specific transmitting power and/or frequency information according to the data transmission parameters related to the preferred coverage range level, and perform data transmission according to the specific transmitting power and/or frequency information.
Fig. 2 is a schematic structural diagram of a data transmission device according to an embodiment of the present invention. Those skilled in the art will appreciate that the data transmission device 2 according to the present embodiment may be used to implement the method technical solution described in the embodiment shown in fig. 1.
Specifically, in the present embodiment, the data transmission apparatus 2 may include: a determining module 21, configured to determine an association relationship between at least one candidate coverage class and a data transmission parameter; a selection module 22, configured to select a preferred coverage level from the at least one candidate coverage levels according to a preset reference index; a transmission module 23, configured to transmit the data according to the data transmission parameters associated with the preferred coverage class.
In one non-limiting embodiment, the selection module 22 may include: a determining submodule 221, configured to determine the preferred coverage level from the at least one candidate coverage level according to at least one or more parameters of the service type, qoS level, transmission mode of the data, and moving speed of the terminal.
In one non-limiting embodiment, the association between the candidate coverage class and the data transmission parameter may be obtained by broadcasting, proprietary signaling, and/or pre-configuration.
In one non-limiting embodiment, the association between the candidate coverage class and the data transmission parameter may include: the larger the coverage corresponding to the candidate coverage class, the greater the transmit power of the data and/or the lower the transmission frequency.
In one non-limiting embodiment, the preset reference index may be selected from: the service type of the data, the moving speed of the terminal, the QoS parameter and the transmission type of the data.
In one non-limiting embodiment, the data transmission parameter may be selected from: transmit power, MCS, and transmission frequency.
In one non-limiting embodiment, the data may be data of V2X traffic.
For more details on the working principle and the working manner of the data transmission device 2, reference may be made to the above description related to fig. 1, which is not repeated here.
The full flow of end-to-end data transmission from the V2X scenario is specifically set forth below.
First, before transmitting data, the transmitting terminal may determine the transmission resource for performing the data transmission according to the time-frequency position, quality and/or size of the available transmission resource (hereinafter referred to as candidate transmission resource).
Specifically, if the MAC entity of the transmitting terminal is set to receive the transmission resource configuration (i.e., the scheduling resource pattern) sent by the downlink control signaling and the current SC cycle cannot be completed for transmitting data, the transmitting terminal may determine the time-frequency resource for transmitting SCI and data as a candidate transmission resource according to the received direct link Grant (SL Grant). The SL Grant may be used to indicate candidate transmission resources corresponding to different mathematical parameters. After receiving the SL Grant, the transmitting terminal may perform data transmission after 4 subframes.
Alternatively, if the MAC entity of the transmitting terminal is configured by an upper layer to transmit using a resource pool (i.e., an automatic selection mode) and the current SC period cannot be transmitted with data, the transmitting terminal may randomly select or perceptually select transmission resources for transmitting SCI and data from the resource pool as candidate transmission resources.
Further, the sending terminal may select an appropriate transmission resource from among the candidate transmission resources for data transmission according to the time-frequency resource configuration, quality and/or size of each candidate transmission resource.
Specifically, the MAC entity of the transmitting terminal may transmit SCI and data in the same subframe. Wherein the data may also be referred to as direct data.
Further, in the case of data transmission, the transmitting terminal may execute the scheme of this embodiment to perform data transmission using appropriate data transmission parameters.
On the other hand, there is a hybrid automatic repeat request (Hybrid Automatic Repeat reQuest, HARQ) entity in the MAC entity of the receiving terminal to be responsible for multiple direct link processes. That is, the receiving terminal can simultaneously and concurrently receive data transmitted by a plurality of transmitting terminals. The number of link procedures supported by the receiving terminal is 8 at maximum. Each HARQ process is associated with a target group of interest to the receiving terminal.
Further, the receiving terminal may first receive a direct link control signaling SCI located on a physical direct link control channel (Physical Sidelink Control Channel, abbreviated PSCCH), and then receive direct data on corresponding time-frequency resources according to the SCI indication. For the same direct data packet, the receiving terminal may receive at most 4 times in one direct link control period.
The receiving terminal filters SCI through 8 bit (bit) information in the interested target group, and for the filtered SCI, the receiving terminal can receive the direct data packet and then determine whether the data is the data of the interested target group according to the 16bit target group information in the MAC layer in the data packet. If so, the data is submitted to a multiplexing entity (Disassembly and Demultiplexing entity).
Further, the embodiment of the invention also discloses a storage medium, on which computer instructions are stored, and the computer instructions execute the technical scheme of the method described in the embodiment shown in fig. 1 when running. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile (non-volatile) memory or a non-transitory (non-transitory) memory. The storage medium may include ROM, RAM, magnetic or optical disks, and the like.
Further, the embodiment of the invention also discloses a terminal, which comprises a memory and a processor, wherein the memory stores computer instructions capable of running on the processor, and the processor executes the technical scheme of the method in the embodiment shown in the figure 1 when running the computer instructions. Preferably, the terminal may be a User Equipment (UE).
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (8)
1. A data transmission method, comprising:
determining the association relation between at least one candidate coverage range level and data transmission parameters;
selecting a preferred coverage level from the at least one candidate coverage level according to a preset reference index;
transmitting the data according to the data transmission parameters associated with the preferred coverage class;
wherein the selecting a preferred coverage level from the at least one candidate coverage level according to a preset reference index comprises:
determining the preferred coverage range level from the at least one candidate coverage range level according to at least two parameters of the service type, the QoS level, the data transmission mode and the moving speed of the terminal, wherein different service types are applied to different V2X application scenarios, and the V2X application scenarios comprise: an autopilot scenario, a fleet scenario, and an extended sensor scenario;
wherein, different base stations configure different association relations between at least one candidate coverage level and data transmission parameters, and the determining the association relation between the at least one candidate coverage level and the data transmission parameters comprises:
receiving and using the association relation between at least one candidate coverage range grade configured by the target base station and the data transmission parameters during the moving from the source base station to the target base station;
if the association relationship between the at least one candidate coverage level of the target base station configuration and the data transmission parameter cannot be successfully received, the association relationship between the at least one candidate coverage level of the source base station configuration received during the residence of the source base station and the data transmission parameter is used.
2. The data transmission method according to claim 1, wherein the association between the candidate coverage class and the data transmission parameter is obtained by broadcasting, proprietary signaling and/or pre-configuration.
3. The data transmission method according to claim 1, wherein the association between the candidate coverage class and the data transmission parameter includes:
the larger the coverage corresponding to the candidate coverage class, the greater the transmit power of the data and/or the lower the transmission frequency.
4. The data transmission method according to claim 1, wherein the data transmission parameter is selected from the group consisting of: transmit power, MCS, and transmission frequency.
5. The data transmission method according to claim 1, wherein the data is data of V2X service.
6. A data transmission apparatus, comprising:
the determining module is used for determining the association relation between at least one candidate coverage range grade and the data transmission parameters;
the selection module is used for selecting a preferred coverage range grade from the at least one candidate coverage range grade according to a preset reference index;
a transmission module, configured to transmit the data according to the data transmission parameters associated with the preferred coverage class;
wherein the selection module comprises:
a determining submodule, configured to determine the preferred coverage level from the at least one candidate coverage level according to at least two parameters of a service type, a QoS level, a data transmission mode and a terminal movement speed of the data, where different service types are applied to different V2X application scenarios, and the V2X application scenarios include: an autopilot scenario, a fleet scenario, and an extended sensor scenario;
wherein, different base stations configure different association relations between at least one candidate coverage range level and data transmission parameters, and the determining module executes the following steps:
receiving and using the association relation between at least one candidate coverage range grade configured by the target base station and the data transmission parameters during the moving from the source base station to the target base station;
if the association relationship between the at least one candidate coverage level of the target base station configuration and the data transmission parameter cannot be successfully received, the association relationship between the at least one candidate coverage level of the source base station configuration received during the residence of the source base station and the data transmission parameter is used.
7. A storage medium having stored thereon computer instructions which, when executed by a processor, perform the steps of the method of any of claims 1 to 5.
8. A terminal comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method of any of claims 1 to 5.
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