CN111294751B - Data transmission method and device, storage medium and terminal - Google Patents

Data transmission method and device, storage medium and terminal Download PDF

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CN111294751B
CN111294751B CN201910027729.0A CN201910027729A CN111294751B CN 111294751 B CN111294751 B CN 111294751B CN 201910027729 A CN201910027729 A CN 201910027729A CN 111294751 B CN111294751 B CN 111294751B
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transmission
data
mcs
farthest
data transmission
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CN111294751A (en
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顾祥新
韩立锋
范慧芳
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/262—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account adaptive modulation and coding [AMC] scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/265—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the quality of service QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/563—Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources
    • 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A data transmission method and device, a storage medium and a terminal are provided, and the method comprises the following steps: acquiring available time-frequency resource blocks; determining resource authorization indication information at least according to the available time-frequency resource blocks, wherein the resource authorization indication information comprises association information of the size and the farthest transmission distance of a transmission block which can be carried by at least one of the available time-frequency resource blocks; selecting the size of a transmission block meeting the data transmission index from the resource authorization indication information according to the data transmission index of data to be transmitted in a data queue to be transmitted; and constructing a transmission block according to the size of the transmission block obtained by selection, and transmitting the data to be transmitted in the data queue to be transmitted by using the transmission block. The scheme provided by the invention can effectively improve the QoS of NR V2X.

Description

Data transmission method and device, storage medium and terminal
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
With the development of the 3rd Generation Partnership Project (3 GPP), New Radio (NR, which may also be referred to as New air interface) vehicle-to-outside information exchange (vehicle to X, V2X, which may also be referred to as vehicle to evolution) is being researched as a key technical direction of the protocol Release 16(Release 16, R16). The enhancement of NR V2X as a Long Term Evolution (LTE) V2X technology is a key technical means for enabling a vehicle network.
In recent research of 3GPP NR V2X, a requirement of a communication distance is provided for a direct link (also referred to as a link) for direct communication between User Equipments (UEs), but the existing data transmission scheme does not consider the communication distance as a factor to be considered for a QoS management mechanism, so that the UEs cannot meet the QoS requirement of NR V2X in terms of communication distance when using the existing data transmission scheme for data transmission.
Disclosure of Invention
The technical problem solved by the invention is how to further improve the QoS of NR V2X.
To solve the foregoing technical problem, an embodiment of the present invention provides a data transmission method, including: acquiring available time-frequency resource blocks; determining resource authorization indication information at least according to the available time-frequency resource blocks, wherein the resource authorization indication information comprises association information of the size and the farthest transmission distance of a transmission block which can be borne by at least one available time-frequency resource block; selecting the size of a transmission block meeting the data transmission index from the resource authorization indication information according to the data transmission index of data to be transmitted in a data queue to be transmitted; and constructing a transmission block according to the size of the transmission block obtained by selection, and transmitting the data to be transmitted in the data queue to be transmitted by using the transmission block.
Optionally, the determining resource authorization indication information according to at least the available time-frequency resource block includes: searching a preset association relation table according to the physical information of the available time-frequency resource block and the maximum transmitting power allowed by the UE to obtain at least one farthest transmission distance and associated MCS meeting the physical information and the maximum transmitting power, wherein the preset association relation table records at least one group of association information of the physical information, the transmitting power, the at least one MCS and the farthest transmission distance; for each searched MCS, calculating according to the MCS to obtain the size of the transmission block; and determining the association information of the transmission block size and the farthest transmission distance for each transmission block size in the at least one transmission block size obtained by calculation.
Optionally, when the number of the physical information, the transmission power, the at least one MCS, and the associated information of the farthest transmission distance recorded in the preset association table is a group, the preset association table records an association relationship between reference physical information, reference transmission power, a reference MCS, and a reference farthest transmission distance, and the searching for the preset association table according to the physical information of the available time-frequency resource block and the maximum transmission power allowed by the UE to obtain the at least one farthest transmission distance and associated MCS that satisfy the physical information and the maximum transmission power includes: searching the preset incidence relation table to obtain at least one reference farthest transmission distance and a relevant reference MCS; for the reference farthest transmission distance and the associated reference MCS, determining a fourth proportional relation between at least one farthest transmission distance and the reference farthest transmission distance according to a first proportional relation between the physical information of the available time-frequency resource block and the reference physical information, a second proportional relation between the maximum transmission power allowed by the UE and the reference transmission power, and a third proportional relation between at least one candidate MCS and the reference MCS; and determining at least one farthest transmission distance according to at least one fourth proportional relation and the reference farthest transmission distance.
Optionally, the preset association table corresponds to the scene where the UE is located one to one.
Optionally, the physical information of the available time-frequency resource blocks is selected from: carrier frequency and bandwidth.
Optionally, the resource authorization indication information further includes: and at least one available time frequency resource block can bear the relevant information of the size of a transmission block and an allowed data transmission mode, wherein the data transmission mode comprises unicast, multicast and broadcast.
Optionally, for the unicast and multicast data transmission modes, the determining the resource authorization indication information according to at least the available time-frequency resource block further includes: determining a target address, wherein the target address is associated with the data transmission mode; determining a target transmission distance according to the target address; searching the preset incidence relation table according to the target transmission distance to judge whether an MCS meeting the target transmission distance exists; when the judgment result shows that the MCS meeting the target transmission distance exists, determining the data transmission mode associated with the target address as an allowable data transmission mode; calculating to obtain the size of the transmission block according to the MCS meeting the target transmission distance; and determining the association information of the transmission block size and the data transmission mode.
Optionally, the data transmission index is selected from: and carrying the priority of the logic channel of the data to be sent, the target transmission distance of the data to be sent and the data transmission mode.
Optionally, the selecting, according to a data transmission indicator of data to be sent in a data queue to be sent, a size of a transport block that meets the data transmission indicator from the resource authorization indication information includes: determining a target transmission distance of data to be transmitted borne by a logical channel with the highest priority in the data queue to be transmitted; and selecting the farthest transmission distance from the resource authorization indication information to meet the target transmission distance, and taking the transmission block size with the largest value as the transmission block size meeting the data transmission index.
To solve the above technical problem, an embodiment of the present invention further provides a data transmission device, including: the acquisition module is used for acquiring available time-frequency resource blocks; a determining module, configured to determine resource authorization indication information according to at least the available time-frequency resource blocks, where the resource authorization indication information includes association information between a size of a transport block that can be carried by at least one of the available time-frequency resource blocks and a farthest transmission distance; a selection module, configured to select, according to a data transmission indicator of data to be sent in a data queue to be sent, a transport block size that meets the data transmission indicator from the resource authorization indication information; and the transmission module is used for constructing a transmission block according to the size of the transmission block obtained by selection and transmitting the data to be transmitted in the data queue to be transmitted by using the transmission block.
To solve the above technical problem, an embodiment of the present invention further provides a storage medium having stored thereon computer instructions, where the computer instructions execute the steps of the above method when executed.
In order to solve the above technical problem, an embodiment of the present invention further provides a terminal, including a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the computer instructions to perform the steps of the method.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
an embodiment of the present invention provides a data transmission method, including: acquiring available time-frequency resource blocks; determining resource authorization indication information at least according to the available time-frequency resource blocks, wherein the resource authorization indication information comprises association information of the size and the farthest transmission distance of a transmission block which can be carried by at least one of the available time-frequency resource blocks; according to a data transmission index of data to be transmitted in a data queue to be transmitted, selecting a transmission block size meeting the data transmission index from the resource authorization indication information; and constructing a transmission block according to the size of the transmission block obtained by selection, and transmitting the data to be transmitted in the data queue to be transmitted by using the transmission block. The scheme provided by the invention can effectively improve the QoS of NR V2X. Specifically, by providing at least one group of choices in the resource authorization indication information, where each group of choices includes a transport block size that can be borne by an available time-frequency resource block and a farthest transmission distance that can be transmitted when a transport block of the size is used to transmit data, the MAC layer of the UE can select the most appropriate transport block size for data transmission according to a data transmission indicator of data to be transmitted when performing LCP, so that a requirement of the data to be transmitted for a target transmission distance can be considered when performing LCP by the MAC layer, so as to meet a QoS requirement on a communication distance in an NR V2X scenario.
Drawings
FIG. 1 is a flow chart of a method of data transmission according to an embodiment of the present invention;
FIG. 2 is a flowchart of one embodiment of step S102 of FIG. 1;
FIG. 3 is a flowchart of one embodiment of step S1021 in FIG. 2;
FIG. 4 is a flow diagram of another embodiment of step S102 of FIG. 1;
FIG. 5 is a flowchart of one embodiment of step S103 of FIG. 1;
fig. 6 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention.
Detailed Description
As mentioned in the background, the existing data transmission scheme does not consider the communication distance as a factor to be considered by the QoS management mechanism, so that the UE cannot satisfy the QoS requirement of NR V2X in terms of communication distance when using the existing data transmission scheme for data transmission.
Specifically, the Quality of Service (QoS) management mechanism for communication between a User Equipment (UE) and a base station in the prior art can be briefly described as follows:
a Media Access Control (MAC) layer of the UE performs a Logical Channel Prioritization (LCP) mechanism, which may include: a) after a physical layer of the UE obtains a wireless resource block (also called a time-frequency resource block, referred to as a resource block for short) (the carrier frequency and the bandwidth of the resource block are fixed), a Modulation and Coding Scheme (MCS for short) may be determined by the physical layer of the UE or determined by the base station; then, the physical layer of the UE may calculate a size of a Transport Block (TB size for short) that can be carried according to the time-frequency domain occupied by the resource Block and the MCS, and notify the MAC layer of the UE. b) The MAC layer of the UE may extract data packets from each logical channel according to the priority of the logical channel and a variable Bj (j is a j-th logical channel, where Bj is a size of data that can be sent by the j-th logical channel this time) maintained for each logical channel to form a transport block, where the size of the transport block finally formed may be equal to or smaller than the transport block size (TB size) notified by the physical layer, and submit the transport block to the physical layer for sending.
In addition to the LCP mechanism, the UE may also use an Automatic Repeat-reQuest (ARQ) MODE (MODE) and a Packet Data Convergence Protocol (PDCP) repetition (multiplexing) MODE (Radio link control, RLC for short), but the former may bring delay and resource overhead while increasing reliability, and the latter may give consideration to both increasing reliability and reducing delay, but may still cause resource overhead.
The communication distance guarantee mechanism of the existing Uu port (between the UE and the base station) is implemented in the physical layer, for example, the base station may guarantee the communication distance by controlling the transmission power (of itself or the UE), the MCS, and the bundling (e.g. repeated transmission) configuration. In other words, existing mechanisms for guaranteeing communication distance do not involve QoS mechanisms of upper layers (such as the MAC layer).
For a New Radio (NR, which may also be referred to as a New air interface) vehicle under study, a guarantee requirement for a communication distance is provided for a legacy to X (V2X, which may also be referred to as a legacy to evolution) direct link (sidelink).
Specifically, the NR V2X scenario mainly includes three data transmission modes, namely broadcast (broadcast), multicast (groupcast) and unicast (unicast).
For the NR V2X data transmission in broadcast mode, there is no explicit target UE, and different packets have different priorities and different target transmission distances.
For NR V2X data transmission in multicast mode, the target UE is a group of UEs, the UEs in the group of UEs are far and near from the UE serving as the data transmission end, and the farthest communication distance (i.e., the farthest transmission distance) to be transmitted at a specific time is managed by the physical layer of the UE at the transmission end.
For NR V2X data transmission in unicast mode, there is a clear target UE, and the farthest communication distance required at a particular time is determined and also managed by the physical layer of the UE as the transmitting end.
The three data transmission modes may share a radio resource pool, that is, a physical layer of the UE reports a resource block to an MAC layer of the UE after obtaining the resource block, and the MAC layer may use the currently obtained resource block in any one of the three data transmission modes when performing LCP, depending on a queuing condition of a data packet waiting to be sent in each current logical channel and a current Bj of each logical channel.
The MAC LCP mechanism for the link is used for extracting data packets by taking a logical channel as a unit, wherein the logical channel has different priorities, and each target address is associated with a group of logical channels, wherein each logical channel corresponds to different priorities. The destination address may include a broadcast address, a multicast address, and a unicast address.
The inventor of the present application has analyzed and found that, for an existing MAC LCP, when a transmission resource grant indication of a specific link sent by a physical layer is received, since the existing indication only includes information of a transport block size, a MAC layer cannot meet requirements of data packets carried by different logical channels for transmission distance when performing LCP.
For example, the data to be transmitted 1, the data to be transmitted 2, and the data to be transmitted 3 in the data queue to be transmitted have three data to be transmitted, where the data to be transmitted 1 is associated with the logical channel 1, the data to be transmitted 2 is associated with the logical channel 2, and the data to be transmitted 3 is associated with the logical channel 3. It is assumed that the priorities of the logical channels are logical channel 1, logical channel 2, and logical channel 3 in sequence from high to low, the data packet of data 1 to be transmitted is 200 bits and the target transmission distance is 300m, the data packet of data 2 to be transmitted is 100 bits and the target transmission distance is 100m, and the data packet of data 3 to be transmitted is 100 bits and the target transmission distance is 200 m. Assuming that the size of a transport block indicated in the resource authorization indication sent by the physical layer this time is 200 bits, according to the existing LCP mechanism, the MAC layer selects a transport block constructed by the data 1 to be sent, which is carried by the logical channel 1 with the highest priority, to be handed over to the physical layer for data transmission. However, if the farthest transmission distance of the currently granted resource when the size of the transmission block is 200 bits is only 100m, the processing method for the UE to transmit the data 1 to be transmitted using the resource will inevitably fail to satisfy the communication distance requirement of 200m for the data 1 to be transmitted, and thus the QoS requirement of NR V2X will not be satisfied.
To solve the foregoing technical problem, an embodiment of the present invention provides a data transmission method, including: acquiring available time-frequency resource blocks; determining resource authorization indication information at least according to the available time-frequency resource blocks, wherein the resource authorization indication information comprises association information of the size and the farthest transmission distance of a transmission block which can be carried by at least one of the available time-frequency resource blocks; according to a data transmission index of data to be transmitted in a data queue to be transmitted, selecting a transmission block size meeting the data transmission index from the resource authorization indication information; and constructing a transmission block according to the size of the transmission block obtained by selection, and transmitting the data to be transmitted in the data queue to be transmitted by using the transmission block.
The scheme provided by the invention can effectively improve the QoS of NR V2X.
Specifically, by providing at least one group of choices in the resource authorization indication information, where each group of choices includes a size of a transport block that can be carried by an available time-frequency resource block and a farthest transmission distance that can be transmitted when the transport block with the size is used to transmit data, the MAC layer of the UE can select a most appropriate transport block size for data transmission according to a data transmission index of data to be transmitted when performing LCP, so that a requirement of the data to be transmitted for a target transmission distance can be considered when performing LCP in the MAC layer, so as to meet a QoS requirement for a communication distance in an NR V2X scenario.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying 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 vehicle networking scene, such as NR V2X. The scheme of this embodiment may be executed by the UE as the sending end, so as to better meet the QoS requirement of NR V2X when performing data transmission.
Specifically, the data transmission method according to this embodiment may include the following steps:
step S101, acquiring available time frequency resource blocks;
step S102, determining resource authorization indication information at least according to the available time frequency resource blocks, wherein the resource authorization indication information comprises association information of the size and the farthest transmission distance of a transmission block which can be carried by at least one available time frequency resource block;
step S103, selecting the size of a transmission block meeting the data transmission index from the resource authorization indication information according to the data transmission index of the data to be transmitted in the data queue to be transmitted;
and step S104, constructing a transmission block according to the size of the transmission block obtained by selection, and transmitting the data to be transmitted in the data queue to be transmitted by using the transmission block.
In one embodiment, the available time-frequency resource blocks may be indicated to the UE by the base station through a dedicated grant (specific grant). Specifically, the physical layer of the UE may receive the dedicated grant, and determine the physical information of the available time-frequency resource blocks according to the dedicated grant.
Further, the physical information of the available time-frequency resource blocks may be selected from: carrier frequency and bandwidth.
In one embodiment, the dedicated grant may further include a Modulation and Coding Scheme (MCS) associated with the available time-frequency resource blocks, and the MCS may be used to indicate the number of bits that can be carried on a single symbol (symbol). Further, the size of the transmission block that can be carried by the available time-frequency resource block can be determined according to the MCS, and by adopting the scheme of this embodiment, the size of the transmission block can be determined while ensuring the transmission distance. Therefore, in this embodiment, the resource grant indication information sent by the physical layer of the UE to the MAC layer includes the association information between the transport block size and the farthest transmission distance, so that the MAC layer of the UE can select, during LCP, the data carried on the logical channel with the highest priority and the target transmission distance matching the farthest transmission distance for transmission.
In a variation, the base station may be preconfigured with a resource pool, and the UE may select a suitable resource from the resource pool according to its own condition for use, where the MCS associated with the available time-frequency resource block may be determined by the UE. In this embodiment, the physical layer of the UE may select multiple MCSs as alternatives according to the dedicated grant, and thus provide multiple sets of association information of the transport block size and the farthest transmission distance to the MAC layer for the MAC layer to select when performing LCP.
The inventor of the present application has found through analysis that the factors affecting the distance in wireless communication mainly include: carrier frequency, bandwidth, transmit power, and MCS.
For the carrier frequency, a rule that the larger the carrier frequency is, the closer the transmission distance is can be summarized, where the larger the carrier frequency is, the higher the frequency range of data transmission is.
For the bandwidth, a rule that the larger the bandwidth is, the closer the transmission distance is can be summarized, wherein the bandwidth refers to the bandwidth of the carrier frequency. For example, the bandwidth may be 180kHz or 360 kHz.
For the transmission power, a rule that the transmission distance is longer when the transmission power is larger can be summarized, wherein the transmission power refers to the maximum transmission power allowed by the UE, and can be comprehensively determined by the UE according to the maximum transmission power of the UE and the path loss from the base station to the UE. Specifically, the larger the path loss, the larger the maximum transmission power allowed by the UE; the smaller the path loss, the smaller the maximum transmit power allowed by the UE.
For MCS, it can be summarized that the larger the MCS is, the larger the transport block size is, and the closer the transmission distance is. Specifically, the duration may be determined after determining the physical information of the time-frequency resource block, and the energy may be determined by combining the transmission power, so that the scheme of this embodiment determines the size of the data that can be transmitted and the association information of the transmission distance under the condition that the energy is fixed. In other words, in the case of fixed energy, the larger the desired transmission distance (i.e., the target transmission distance), the smaller the data that can be transmitted, which means the smaller the transport block size. The larger the MCS is, the larger the preset sequence number of the MCS is, and the larger the value of the parameter included in the MCS is. For example, MCS2 is greater than MCS 1.
In one embodiment, referring to fig. 2, the step S102 may include the steps of:
step S1021, searching a preset association relation table according to the physical information of the available time-frequency resource block and the maximum transmitting power allowed by the UE to obtain at least one farthest transmission distance and associated MCS meeting the physical information and the maximum transmitting power, wherein the preset association relation table records at least one group of association information of the physical information, the transmitting power, the at least one MCS and the farthest transmission distance;
step S1022, for each MCS obtained by searching, calculating according to the MCS to obtain the size of the transmission block;
step S1023, for each of the calculated at least one transport block sizes, determines the association information between the transport block size and the farthest transmission distance.
Specifically, the preset association relationship table may be predefined by a standard.
More specifically, the steps S1021 to S1023 may be performed by a physical layer of the UE.
In an alternative example, the preset association table may record four dimensions of physical information, transmission power, MCS and farthest transmission distance at the same time. The physical information may include carrier frequency and bandwidth, so that the preset association table may have five dimensions.
In another alternative, a plurality of preset association tables may be maintained in advance, wherein each preset association table records any plurality of the five dimensions. For example, a bandwidth may correspond to a predetermined association table, where each predetermined association table records association information of a carrier frequency, a transmission power, at least one MCS, and a farthest transmission distance under a specific bandwidth. For another example, a bandwidth and a carrier frequency may correspond to a preset association table, where each preset association table records association information of a specific bandwidth, transmission power at a specific carrier frequency, at least one MCS, and a farthest transmission distance.
Further, in the preset association relationship table, the same carrier frequency, bandwidth and transmission power may be associated with one or more MCSs, where each MCS may be associated with a farthest transmission distance.
Further, in step S1021, according to the physical information and the maximum allowed transmit power of the UE, the corresponding at least one MCS and the farthest transmission distance associated with each MCS may be obtained by looking up from the preset association table.
Further, in step S1022, for each MCS, the transport block size may be jointly determined according to the size of the available time-frequency resource block and the MCS.
Thus, in step S1023, the transport block size that can be transmitted using the searched MCS1 and the associated farthest transmission distance, the transport block size that can be transmitted using the searched MCS2 and the associated farthest transmission distance, the transport block size that can be transmitted using the searched MCS3 and the associated farthest transmission distance, and the like can be determined. The physical layer of the UE may generate and deliver the resource grant indication information to the MAC layer of the UE based on the obtained at least one transport block size and the associated farthest transmission distance.
In another embodiment, when the number of the physical information, the transmission power, the at least one MCS and the farthest transmission distance recorded by the preset association table is one group, the preset association table may record the association relationship between the reference physical information, the reference transmission power, the reference MCS and the reference farthest transmission distance.
Further, referring to fig. 3, the step S1021 may include the steps of:
step S10211, searching the preset association relation table to obtain at least one reference farthest transmission distance and an associated reference MCS;
step S10212, for the reference farthest transmission distance and the associated reference MCS, determining a fourth proportional relationship between at least one farthest transmission distance and the reference farthest transmission distance according to a first proportional relationship between the physical information of the available time-frequency resource block and the reference physical information, a second proportional relationship between the maximum transmission power allowed by the UE and the reference transmission power, and a third proportional relationship between at least one candidate MCS and the reference MCS;
step S10213, determining at least one farthest transmission distance according to the reference farthest transmission distance and at least one fourth proportional relationship.
Specifically, the candidate MCS may be other MCS than the reference MCS, which is not listed in the preset association table. For example, assuming that the reference MCS listed in the preset association table is MCS1, the candidate MCS may be MCS2, MCS3, or the like.
Further, the reference physical information may be a physical reference value predetermined by a standard or a protocol, and the physical reference value may be a minimum unit of carrier frequency and bandwidth. For example, the reference bandwidth may be 180 kHz.
Under the condition of fixed carrier frequency, according to the first proportional relation between the bandwidth in the physical information of the available time-frequency resource block and the reference bandwidth, and in combination with the inverse proportional relation between the bandwidth and the farthest transmission distance, the required farthest transmission distance can be obtained by scaling in equal proportion.
Under the condition of fixed physical information, according to a second proportional relation between the maximum transmitting power allowed by the UE and the reference transmitting power, and in combination with a proportional relation between the transmitting power and the farthest transmission distance, the required farthest transmission distance can be obtained by scaling in an equal manner. For example, assuming that the second proportional relationship is 2 times, the fourth proportional relationship may be
Figure BDA0001943106980000111
And (4) doubling.
Under the condition of fixing the physical information and the transmitting power, according to the third proportional relation between the candidate MCS and the reference MCS and the relation between the MCS and the farthest transmission distance, the required farthest transmission distance can be obtained. For example, MCS2 has a transmission bit number (i.e. the size of the transport block) 4/3 times MCS1 relative to MCS1, and the corresponding farthest transmission distance is the farthest transmission distance associated with MCS1
Figure BDA0001943106980000112
Similarly, the reference farthest transmission distance, the reference transmission power, and the reference MCS may all be reference values predetermined by a standard or a protocol, and in practical applications, the first proportional relationship and the second proportional relationship may be obtained by determining physical information of an available time-frequency resource block indicated by the current dedicated grant and a maximum transmission power currently allowed by the UE, and the at least one fourth proportional relationship may be obtained by combining a third proportional relationship between the at least one candidate MCS and the reference MCS.
For example, the fourth proportional relationship and the first, second, and third proportional relationships may be simple arithmetic relationships, or proportional relationships with higher accuracy obtained through experiments to obtain higher conversion accuracy. Preferably, it can be based on a formula
Figure BDA0001943106980000113
And calculating to obtain the fourth proportional relation d, wherein a is the first proportional relation, b is the second proportional relation, and c is the third proportional relation. Preferably, the reference transmit power may be 1/8 watts (w), the reference bandwidth may be 180kHz, and the reference MCS may be MCS1, so that the farthest reference transmission distance at a specific carrier frequency may be determined.
Of course, in practical applications, the first proportional relationship, the second proportional relationship, the third proportional relationship, and the fourth proportional relationship may also be corrected according to experiments to compensate for the influence on the fitting result when the linearity is poor, so as to obtain the correlation between the size of the transmission block and the farthest transmission distance that better meets the actual situation.
In practical applications, the three proportional relationships a, b, and c in the above formula may not necessarily exist at the same time, for example, when a corresponding preset association table is set for each piece of physical information (including bandwidth and carrier frequency), the parameter a in the above formula may be omitted. At this time, a suitable preset association relation table may be determined according to the physical information of the available time-frequency resource blocks, and the fourth proportional relation may be determined according to the second proportional relation and the third proportional relation.
Further, for each fourth proportional relationship, a corresponding farthest transmission distance may be determined according to the fourth proportional relationship and the reference farthest transmission distance, and the farthest transmission distance is associated with a candidate MCS associated with a third proportional relationship used for determining the fourth proportional relationship. Thereby, at least one farthest transmission distance and associated MCS (i.e. the candidate MCS) may be obtained.
In an embodiment, the preset association relationship table may correspond to a scenario in which the UE is located.
For example, when the UE is on a highway or an urban road, different preset association tables may be corresponding. Specifically, the physical layer of the UE may be aware of the current scenario in which the UE is determined to be located.
In one embodiment, the three data transmission modes of NR V2X may jointly transmit the resource, and thus, when the resource grant is indicated to the MAC layer, in addition to indicating the combination of the transport block size and the farthest transmission distance that the available time-frequency resource can be used for broadcasting in the resource grant indication information, the physical layer of the UE needs to indicate the available time-frequency resource blocks allowed unicast and multicast, and the transport block size associated with each allowed unicast or multicast, in the resource grant indication information.
For example, the indication may be performed by indicating a sequence number, a destination address, and the like of unicast or multicast that can be used in the resource authorization indication information.
In other words, the resource authorization indication information may include: and at least one available time frequency resource block can bear the relevant information of the size of a transmission block and an allowed data transmission mode, wherein the data transmission mode comprises unicast, multicast and broadcast.
Further, referring to fig. 4, for the unicast and multicast data transmission modes, the step S102 may further include the following steps:
step S1024, determining a target address, wherein the target address is associated with the data transmission mode;
step S1025, determining a target transmission distance according to the target address;
step S1026, search the said preset incidence relation table according to the said goal transmission distance, in order to judge whether there is MCS meeting the said goal transmission distance;
step S1027, when the judgment result shows that there is MCS meeting the target transmission distance, determining the data transmission mode associated with the target address as an allowed data transmission mode;
step S1028, calculating to obtain the size of the transmission block according to the MCS meeting the target transmission distance;
step S1029, determining the association information between the transport block size and the data transmission mode.
Specifically, the target address may be indicated by an application layer of the UE, and different data transmission manners may have different target addresses. For example, unicast may correspond to a unicast address and multicast may correspond to a multicast address.
Further, the physical layer of the UE may obtain the target transmission distance according to the path loss information maintained in the history during data transmission to the target address.
Further, in a multicast and unicast data transmission scenario, since the target transmission distance is known information, the physical layer of the UE may obtain the maximum MCS that can satisfy the target transmission distance by looking up the preset association table. At this time, the carrier frequency and bandwidth of the available time-frequency resource block and the maximum transmission power allowed by the UE are known at the corresponding time.
If the table lookup result indicates that no MCS capable of meeting the target transmission distance exists in the preset association relation table, it may be determined that the available time-frequency resource block cannot be used for the multicast or unicast data transmission.
In one embodiment, the data transmission indicator may be selected from: and carrying the priority of the logic channel of the data to be sent, the target transmission distance of the data to be sent and the data transmission mode.
Further, referring to fig. 5, the step S103 may include the steps of:
step S1031, determining a target transmission distance of data to be transmitted carried by a logical channel with the highest priority in the data queue to be transmitted;
step S1032, select the farthest transmission distance from the resource authorization indication information to satisfy the target transmission distance, and use the transmission block size with the largest value as the transmission block size satisfying the data transmission index.
Specifically, the steps S1031 and S1032 may be performed by a MAC layer of the UE.
More specifically, steps S1031 and S1032 may be similar to the MAC LCP process in the prior art, except that, compared to the prior art, when the MAC layer of the UE adopting the scheme in this embodiment performs LCP, the MAC layer of the UE further takes the target transmission distance of the data to be sent as one of the considerations of LCP
Further, the target transmission distance of the data to be transmitted may be determined by the physical layer of the UE and indicated to the MAC layer. For example, the target transmission distance may be determined according to a path loss between the UE of the target address of the data to be transmitted and the UE.
In step S1031, in response to receiving the resource authorization indication information, the MAC layer of the UE may prioritize an option that can match the requirement for the transmission distance in the to-be-transmitted data queue. Further, when the farthest transmission distances associated with the sizes of the multiple transmission blocks all satisfy the target transmission distance of the data to be transmitted, which is carried by the logical channel with the highest priority in the data queue to be transmitted, the MAC layer may select the size of the largest transmission block among the multiple transmission blocks to construct a corresponding transmission block and perform data transmission.
For example, it is assumed that the resource authorization indication information determined in step S102 includes two transport block sizes and respective associated farthest transmission distances, which are respectively 100 bits corresponding to 200m and 200 bits corresponding to 100m, and the to-be-transmitted data queue includes two to-be-transmitted data, which are respectively to-be-transmitted data 1, associated logical channel 1 and target transmission distance 100m, to-be-transmitted data 2, associated logical channel 2 and target transmission distance 300m, and the priority of logical channel 1 is greater than the priority of logical channel 2. Then, when executing step S1031, the MAC layer may select a suitable transport block size according to the target transmission distance of the to-be-transmitted data 1 carried by the logical channel 1 with a higher priority.
Further, in this example, since the farthest transmission distances of the two transport block sizes both satisfy the target transmission distance of the data 1 to be transmitted, the MAC layer may further select a transport block size with a larger value, that is, 200 bits, from the farthest transmission distances to construct a corresponding transport block, and perform data transmission.
For another example, it is still assumed that the resource grant indication information determined in step S102 includes two transport block sizes and respective associated farthest transmission distances, which are respectively 100 bits for 200m and 200 bits for 100m, the target transmission distance of the data to be transmitted carried by the logical channel with the highest priority (referred to as logical channel a) included in the data queue to be transmitted is 300m, since the farthest transmission distances associated with the sizes of the two transmission blocks determined this time cannot meet the transmission distance requirement of the data to be transmitted with the highest priority, thus, the MAC layer may select to match a target transmission distance of data to be transmitted carried by another logical channel with a priority next to the logical channel a with a farthest transmission distance associated with two transport block sizes until data to be transmitted satisfying the farthest transmission distance associated with any one of the two transport block sizes is found. Therefore, the data to be transmitted with the highest priority can be transmitted in time on the basis that the requirement of the transmission distance can be guaranteed.
In an embodiment, the specific process of step S104 may refer to the related specification of the existing LCP, which is not described herein again.
Therefore, the scheme provided by the invention can effectively improve the QoS of the NR V2X. Specifically, by providing at least one group of choices in the resource authorization indication information, where each group of choices includes a size of a transport block that can be carried by an available time-frequency resource block and a farthest transmission distance that can be transmitted when the transport block with the size is used to transmit data, the MAC layer of the UE can select a most appropriate transport block size for data transmission according to a data transmission index of data to be transmitted when performing LCP, so that a requirement of the data to be transmitted for a target transmission distance can be considered when performing LCP in the MAC layer, so as to meet a QoS requirement for a communication distance in an NR V2X scenario.
Fig. 6 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention. Those skilled in the art understand that the data transmission device 6 of the present embodiment may be used to implement the method technical solutions described in the embodiments shown in fig. 1 to fig. 5.
Specifically, in this embodiment, the data transmission device 6 may include: an obtaining module 61, configured to obtain an available time-frequency resource block; a determining module 62, configured to determine resource authorization indication information according to at least the available time-frequency resource blocks, where the resource authorization indication information includes association information between a size of a transmission block that can be carried by at least one of the available time-frequency resource blocks and a farthest transmission distance; a selecting module 63, configured to select, according to a data transmission indicator of data to be sent in a data queue to be sent, a transport block size that meets the data transmission indicator from the resource authorization indication information; and a transmission module 64, configured to construct a transmission block according to the size of the selected transmission block, and send data to be sent in the data queue to be sent using the transmission block.
In one embodiment, the determining module 62 may include: a first searching sub-module 621, configured to search a preset association table according to the physical information of the available time-frequency resource block and the maximum transmit power allowed by the UE, so as to obtain at least one farthest transmission distance and an associated MCS that satisfy the physical information and the maximum transmit power, where the preset association table records at least one set of association information of the physical information, the transmit power, the at least one MCS, and the farthest transmission distance; the first calculating sub-module 622, for each searched MCS, calculating to obtain the size of the transport block according to the MCS; the first determining sub-module 623 determines, for each of the calculated at least one transport block sizes, association information between the transport block size and the farthest transmission distance.
In one embodiment, when the number of the association information of the physical information, the transmission power, the at least one MCS, and the farthest transmission distance recorded by the preset association table is a group, the preset association table may record an association relationship between reference physical information, reference transmission power, a reference MCS, and a reference farthest transmission distance, and the first lookup sub-module 621 may include: a searching unit 6211, configured to search the preset association relation table to obtain at least one reference farthest transmission distance and an associated reference MCS; a first determining unit 6212, configured to determine, for the reference farthest transmission distance and the associated reference MCS, a fourth proportional relationship between at least one farthest transmission distance and the reference farthest transmission distance according to a first proportional relationship between the physical information of the available time-frequency resource blocks and the reference physical information, a second proportional relationship between the maximum transmission power allowed by the UE and the reference transmission power, and a third proportional relationship between at least one candidate MCS and the reference MCS; a second determining unit 6213, configured to determine at least one farthest transmission distance according to at least one of the fourth proportional relationships and the reference farthest transmission distance.
In an embodiment, the preset association relation table may correspond to a scene where the UE is located one to one.
In one embodiment, the physical information of the available time-frequency resource blocks may be selected from: carrier frequency and bandwidth.
In one embodiment, the resource authorization indication information may further include: and at least one available time frequency resource block can bear the relevant information of the size of a transmission block and an allowed data transmission mode, wherein the data transmission mode comprises unicast, multicast and broadcast.
Further, for the unicast and multicast data transmission modes, the determining module 62 may further include: a second determining submodule 624, configured to determine a target address, where the target address is associated with the data transmission mode; a third determining submodule 625, configured to determine a target transmission distance according to the target address; a second searching submodule 626, configured to search the preset association table according to the target transmission distance, so as to determine whether an MCS meeting the target transmission distance exists; a fourth determining sub-module 627, configured to determine, when the determination result indicates that there is an MCS that meets the target transmission distance, that the data transmission mode associated with the target address is an allowed data transmission mode; a second calculating submodule 628 configured to calculate, according to the MCS that satisfies the target transmission distance, the size of the transmission block; the fifth determining sub-module 629 is configured to determine the association information between the size of the transport block and the data transmission mode.
In one embodiment, the data transmission indicator may be selected from: and carrying the priority of the logical channel of the data to be sent, the target transmission distance of the data to be sent and the data transmission mode.
Further, the selecting module 63 may include: a sixth determining sub-module 631, configured to determine a target transmission distance of data to be transmitted, where the data to be transmitted is carried by a logical channel with a highest priority in the data queue to be transmitted; the selecting submodule 632 is configured to select, from the resource authorization indication information, a transmission block size that satisfies the target transmission distance and has a largest value as the transmission block size that satisfies the data transmission indicator.
For more details of the operation principle and the operation mode of the data transmission device 6, reference may be made to the description in fig. 1 to 5, which is not repeated herein.
Further, the embodiment of the present invention further discloses a storage medium, on which computer instructions are stored, and when the computer instructions are executed, the method technical solution described in the embodiments shown in fig. 1 to fig. 5 is executed. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile (non-volatile) memory or a non-transitory (non-transient) memory. The storage medium may include ROM, RAM, magnetic or optical disks, etc.
Further, an embodiment of the present invention further discloses a terminal, which includes a memory and a processor, where the memory stores a computer instruction capable of running on the processor, and the processor executes the method technical solution described in the embodiments shown in fig. 1 to 5 when running the computer instruction. 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 effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (12)

1. A method of data transmission, comprising:
acquiring available time-frequency resource blocks;
determining resource authorization indication information at least according to the available time-frequency resource blocks, wherein the resource authorization indication information comprises association information of the size and the farthest transmission distance of a transmission block which can be borne by at least one available time-frequency resource block;
selecting the size of a transmission block meeting the data transmission index from the resource authorization indication information according to the data transmission index of data to be transmitted in a data queue to be transmitted;
and constructing a transmission block according to the size of the transmission block obtained by selection, and transmitting the data to be transmitted in the data queue to be transmitted by using the transmission block.
2. The data transmission method according to claim 1, wherein the determining resource grant indication information at least according to the available time-frequency resource blocks comprises:
searching a preset association relation table according to the physical information of the available time-frequency resource block and the maximum transmitting power allowed by the UE to obtain at least one farthest transmission distance and associated MCS meeting the physical information and the maximum transmitting power, wherein the preset association relation table records at least one group of association information of the physical information, the transmitting power, the at least one MCS and the farthest transmission distance;
for each searched MCS, calculating according to the MCS to obtain the size of the transmission block;
and determining the association information of the transmission block size and the farthest transmission distance for each transmission block size in the at least one calculated transmission block size.
3. The data transmission method according to claim 2, wherein when the physical information, the transmission power, the at least one MCS, and the number of the associated information of the farthest transmission distance recorded in the preset association table are in a group, the preset association table records the association relationship between the reference physical information, the reference transmission power, the reference MCS, and the reference farthest transmission distance, and the searching for the preset association table according to the physical information of the available time-frequency resource block and the maximum transmission power allowed by the UE to obtain the at least one farthest transmission distance and the associated MCS that satisfy the physical information and the maximum transmission power comprises:
searching the preset incidence relation table to obtain at least one reference farthest transmission distance and a relevant reference MCS;
for the reference farthest transmission distance and the associated reference MCS, determining a fourth proportional relation between at least one farthest transmission distance and the reference farthest transmission distance according to a first proportional relation between the physical information of the available time-frequency resource block and the reference physical information, a second proportional relation between the maximum transmission power allowed by the UE and the reference transmission power, and a third proportional relation between at least one candidate MCS and the reference MCS;
and determining at least one farthest transmission distance according to at least one fourth proportional relation and the reference farthest transmission distance.
4. The data transmission method according to claim 2, wherein the preset association table corresponds to a scene where the UE is located.
5. The method according to any of claims 2 to 4, wherein the physical information of the available time-frequency resource blocks is selected from the group consisting of: carrier frequency and bandwidth.
6. The data transmission method according to any one of claims 2 to 4, wherein the resource grant indication information further includes: and at least one available time frequency resource block can carry the association information of the size of the transmission block and the allowed data transmission modes, wherein the data transmission modes comprise unicast, multicast and broadcast.
7. The data transmission method according to claim 6, wherein for unicast and multicast data transmission modes, said determining resource grant indication information at least according to the available time-frequency resource blocks further comprises:
determining a target address, wherein the target address is associated with the data transmission mode;
determining a target transmission distance according to the target address;
searching the preset incidence relation table according to the target transmission distance to judge whether an MCS meeting the target transmission distance exists;
when the judgment result shows that the MCS meeting the target transmission distance exists, determining the data transmission mode associated with the target address as an allowed data transmission mode;
calculating to obtain the size of the transmission block according to the MCS meeting the target transmission distance;
and determining the association information of the transmission block size and the data transmission mode.
8. The data transmission method according to claim 1, wherein the data transmission indicator is selected from the group consisting of: and carrying the priority of the logical channel of the data to be sent, the target transmission distance of the data to be sent and the data transmission mode.
9. The data transmission method according to claim 8, wherein the selecting, according to a data transmission indicator of data to be sent in a data queue to be sent, a transport block size that meets the data transmission indicator from the resource grant indication information includes:
determining a target transmission distance of data to be transmitted borne by a logical channel with the highest priority in the data queue to be transmitted;
and selecting the farthest transmission distance from the resource authorization indication information to meet the target transmission distance, and taking the transmission block size with the largest value as the transmission block size meeting the data transmission index.
10. A data transmission apparatus, comprising:
the acquisition module is used for acquiring available time-frequency resource blocks;
a determining module, configured to determine resource authorization indication information at least according to the available time-frequency resource blocks, where the resource authorization indication information includes association information between a size of a transmission block that can be carried by at least one of the available time-frequency resource blocks and a farthest transmission distance;
a selection module, configured to select, according to a data transmission indicator of data to be sent in a data queue to be sent, a transport block size that meets the data transmission indicator from the resource authorization indication information;
and the transmission module is used for constructing a transmission block according to the size of the transmission block obtained by selection and transmitting the data to be transmitted in the data queue to be transmitted by using the transmission block.
11. A storage medium having stored thereon computer instructions, wherein said computer instructions when executed perform the steps of the method of any of claims 1 to 9.
12. 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 one of claims 1 to 9.
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