Data transmission method, data transmission device, non-transitory computer-readable medium and chip

Abstract

The present invention provides a data transmission method, a data transmission device, a non-transitory computer-readable medium, and a chip for sidelink communication.

Description

[Technical field]

[0001] The present disclosure relates to communications technologies, and in particular to sidelink communications. [Background technology]

[0002] The statements in this section are merely intended to provide information related to the present disclosure and do not constitute prior art. Furthermore, the contents of this section may be used to define concepts related to the present invention.

[0003] During the development of Long Term Evolution-V2X (LTE-V2X) communications, two sidelink resource selection modes are supported: Mode 3 for network scheduling and Mode 4 for UE autonomous selection. To avoid multiple UEs selecting the same or overlapping sidelink resources for transmission and causing collisions, the transmitting UE needs to first perform resource sensing to identify the resources already reserved by other UEs, and then select an unused / free resource for its own transmission. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention relates to The present invention can be used to solve the above-mentioned problems. The present invention relates to a data transmission method, a data transmission device, a non-transitory computer-readable medium, and a chip for sidelink communication. [Means for solving the problem]

[0005] A data transmission method is performed by an apparatus configured for sidelink communication, the method comprising the steps of determining a reception priority level of received data, determining a transmission priority level of transmitted data, and excluding resources for the sidelink communication based on a threshold. Effect of the Invention

[0006] The technical solutions provided by the embodiments of the present disclosure may involve resource conflicts.

[0007] The drawings are for illustrative purposes only and are not intended to be limiting of the invention. [Brief description of the drawings]

[0008] [Figure 1] A flowchart of one method is shown. [Diagram 2] 1 shows an example of a UE. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] According to various embodiments, a sidelink priority threshold selection method for LTE V2X communications can be provided in vehicles (e.g., automobiles) and user equipment (e.g., smartphones) equipped with, for example, 3GPP Release 15 or later 4G LTE-V2X and 5G NR-V2X capable communications modem chipsets.

[0010] According to the LTE sidelink mode 4 resource selection procedure, a UE may first identify reserved resources by decoding sidelink control information (SCI) transmitted from other UEs and measure the physical sidelink shared channel (PSSCH) reference signal received power (RSRP) in the associated data resources. If the measured PSSCH RSRP level is above a certain threshold level, the UE may consider that the associated sidelink resources are not available for selection, i.e., they should be excluded from the candidate resource set for selection. Similarly, if the measured PSSCH RSRP is below a threshold level (e.g., due to long distance), the UE considers that the reserved resources are available for selection. The PSSCH RSRP threshold may be defined as a function of the priority level of the transmitted message and the priority level of the received message. There are eight levels of sensing priority, defined as sensingPriority=integer(1···8) for LTE-V2X messages. Considering 8 levels of priority for transmitted messages and 8 levels of priority for received messages, there are a total of 64 different priority combinations, and therefore 64 different threshold levels for each transmitted and received message priority pair. These threshold levels are (pre-)configurable and are represented in 3GPP TS 36.331 and TS 38.331 as information elements SL-ThresPSSCH-RSRP-List. According to various embodiments, the exact PSSCH RSRP threshold level to be used for resource exclusion can be derived.

[0011] According to various embodiments, in order for an LTE sidelink mode 4 UE or an NR sidelink mode 2 UE to correctly select the correct thresholds from the configured threshold set (SL-ThresPSSCH-RSRP-List) to decide whether a reserved sidelink resource should be excluded from the candidate resource set based on the corresponding transmission and reception priorities, a priority threshold selection formula can be defined as i=(a-1)x8+b, where a denotes the priority of the transmitted message and b denotes the priority of the received message. In this way, the i-th SL-ThresPSSCH-RSRP field in the SL-ThresPSSCH-RSRP-List may have a current value range from ((1-1)x8+1)=1 to ((8-1)x8+8)=64, which range may indicate the full range of the specified SL-ThresPSSCH-RSRP-List. Thus, the UE can select the correct and appropriate threshold levels corresponding to the correct Tx and Rx message priorities in the resource exclusion and selection procedures.

[0012] According to various embodiments,

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[0013] In this way, the i-th SL-ThresPSSCH-RSRP field in the SL-ThresPSSCH-RSRP-List may have a current value range from ((1-1) x 8 + 1) = 1 to ((8-1) x 8 + 8) = 64, which may point to the full range of the intended SL-ThresPSSCH-RSRP-List.

[0014] Therefore, the UE can select accurate and appropriate threshold levels corresponding to correct Tx and Rx message priorities in resource deselection and selection procedures.

[0015] As a result, the UE will be able to find appropriate resources to send messages (and will no longer be frustrated by not being able to find them), which is expected to improve V2X communication performance.

[0016] Furthermore, this definition of the priority threshold selection equation is applicable to cases where partial sensing is configured in the upper layer as well as cases where partial sensing is not configured in the upper layer.

[0017] The methods and apparatus according to various embodiments may be applied to TS 36.213 v16.2.0(2020-06) for LTE V2X as described below.

[0018] According to various embodiments, a UE procedure for determining the subset of resources to be reported to higher layers for PSSCH resource selection in LTE sidelink transmission mode 4 and sensing measurements in LTE sidelink transmission mode 3 is provided as follows:

[0019] In LTE sidelink transmission mode 4, the UE may determine the set of resources to be reported to higher layers for PSSCH transmission, if requested by higher layers in subframe n of the carrier, according to the steps described herein. subCH is the number of subchannels used for PSSCH transmission in a subframe. rsvp_TX is the resource reservation interval, and prio TX is related by the UE sidelink control information ( SCI ) Priorities transmitted in format 1, all of which are provided by higher layers, e.g. the medium access control (MAC) layer, whenever there is SL data available for transmission.

[0020] The number of subframes in one set of time and frequency resources for PSSCH transmission opportunities is Cresel and may be determined by 10 × SL_RESOURCE_RESELECTION_COUNTER, where SL_RESOURCE_RESELECTION_COUNTER is configured, and other C resel is set to 1 (if configured, else C resel is set to 1).

[0021] In sidelink transmission mode 3, the UE may determine the set of resources to be reported to higher layers in sensing measurements, if requested by higher layers in subframe n of the carrier, according to the steps described herein. subCH , P rsvp_TX , and prio TX is provided by a higher layer (e.g., the MAC layer).

[0022] C resel is C resel = 10 × SL_RESOURCE_RESELECTION_COUNTER, where SL_RESOURCE_RESELECTION_COUNTER is provided by a higher layer (e.g., the MAC layer).

[0023] If partial sensing is not configured in higher layers, it can be achieved by the following steps.

[0024] 1) PSSCH transmission R x,y The candidate single subframe resources for

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[0025] 2) The UE is not aware of any transmissions other than those that originate from it.

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[0026] 3) Parameter Th a,bmay be set to the value indicated in the i-th SL-ThresPSSCH-RSRP field in the SL-ThresPSSCH-RSRP-List, where i=(a-1)×8+b.

[0027] 4) Set S A is initialized to the union of all candidate single-subframe resources. B is initialized to the empty set.

[0028] 5) The UE selects any candidate single subframe resource R x,y Set S A can be excluded from

[0029] - in step 2, the UE

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[0030] - y+j×P′ rsvp_TX =z+P step ×k×q, where j=0, 1, …, C resel -1, P′ rsvp_TX =P step ×P rsvp_TX / 100, k is any value allowed by the higher layer parameter restrictResourceReservationPeriod, and q = 1, 2, ..., Q, where k < 1 and n'-z ≤ P,

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[0031] 6) The UE selects any candidate single subframe resource R x,y Set S A can be excluded from

[0032] - UE

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[0033] - PSSCH-RSRP measurements with received SCI format 1 are

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[0034] -

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[0035] When partial sensing is configured at higher layers, the following steps are utilized.

[0036] 1) PSSCH transmission R x,y The candidate single subframe resources for

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[0037] 2) In step 1

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[0038] 3) Parameter Th a,b is set to the value indicated in the i-th SL-ThresPSSCH-RSRP field in the SL-ThresPSSCH-RSRP-List, where i=(a-1)x8+b.

[0039] 4) Set S A may be initialized to the union of all candidate single-subframe resources. B may be initialized to the empty set.

[0040] 5) The UE selects any candidate single subframe resource R x,y Set S A can be excluded from

[0041] - UE

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[0042] - PSSCH-RSRP measurements with received SCI format 1 are

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[0043] -

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[0044] The methods and apparatus according to various embodiments may be applied to TS 38.214 v16.2.0(2020-06) or TS 38.214 v16.3.0(2020-09) for NR sidelink, as described below.

[0045] According to various embodiments, a UE procedure for determining the subset of resources reported to higher layers for PSSCH / PSCCH resource selection in NR sidelink resource allocation mode 2 can be provided as follows.

[0046] In NR sidelink resource allocation mode 2, higher layers may request the UE to determine a subset of resources from which the higher layers can select resources for PSSCH / PSCCH transmission. To trigger this procedure, in slot n, the higher layers may provide the following parameters for this PSSCH / PSCCH transmission:

[0047] - The resource pool that reports the resource. - L1 priority,prio TX . - The remaining packet delay budget. - the number of subchannels used for PSSCH / PSCCH transmission in a slot, L subCH . - Optionally, the resource reservation interval in milliseconds, P rsvp_TX .

[0048] - If higher layers request the UE to determine a subset of resources from which the higher layers can select resources for PSSCH / PSCCH transmission as part of a re-evaluation or pre-emption procedure, the higher layers can provide a set of resources subject to re-evaluation (r0, r1, r2, ...) and a set of resources subject to pre-emption (r'0, r'1, r'2, ...).

[0049] Slot R i The decision of the subset of resources requested by higher layers before or after "-T3" is up to the UE implementation. i ″ is the slot with the smallest slot index among (r0, r1, r2, …) and (r′0, r′1, r′2, …), and T3 is

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[0050] The following higher layer parameters influence this procedure: - sl-SelectionWindowList: Internal parameter T 2min is,prio TX For a given value of sl-SelectionWindowList, it can be set to the corresponding value from the higher layer parameter sl-SelectionWindowList.

[0051] - sl-ThresPSSCH-RSRP-List: This higher layer parameter isi ,p j ), where p i is the value of the priority field of the received SCI format 1-A, and p j is the transmission priority of the UE selected resource, and for a given invocation of this procedure, p j =prio TX It is.

[0052] -sl-RS-ForSensing allows the UE to select whether to use PSSCH-RSRP or PSCCH-RSRP measurements.

[0053] -sl-ResourceReservePeriodList-r16.

[0054] - sl-SensingWindow: An internal parameter T0 can be defined as the number of slots corresponding to sl-SensingWindow ms.

[0055] - sl-TxPercentageList: the given prio TX The inner parameter X is the sl-TxPercentageList(prio TX ) can be defined as

[0056] - sl-PreemptionEnable: If sl-PreemptionEnable-r16 is provided and is not equal to "enabled", the internal parameter prio pre is set in the higher layer provided with the parameter sl-PreemptionEnable.

[0057] Resource reservation interval P rsvp_TX If provided, it may be converted from units of milliseconds to units of logical slots, so that P' rsvp_TX become.

[0058]

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[0059] The following steps can be used: 1) Send R x,y Candidate single slot resources for

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[0060] - T1 selection is

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[0061] - T 2min If T is less than the remaining packet delay budget (in slots), then T 2min Subject to T2≦remaining packet delay budget (in slots), it is determined by the UE implementation, otherwise T2 is set to the remaining packet delay budget (in slots). The total number of candidate single slot resources is M total It is expressed as:

[0062] 2) The sensing window is

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[0063] 3) Internal parameter Th(p i ,p j ) may be set to the corresponding value of the RSRP threshold indicated in the i-th field of sl-ThresPSSCH-RSRP-List-r16, where i=p i +(p j -1) × 8.

[0064] 4) Set S A is initialized to the set of all candidate single-slot resources.

[0065] 5) The UE selects any candidate single-slot resource R if all of the following conditions are met: x,y Set S A can be excluded from

[0066] - in step 2, the UE

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[0067] - a periodicity value allowed by the higher layer parameter sl-ResourceReservePeriodList-r16 and the "Resource reservation period" field is set to that periodicity value to indicate all subchannels of the resource pool in this slot

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[0068] 6) The UE selects any candidate single-slot resource R if all of the following conditions are met: x,y Set S A can be excluded from

[0069] a) The UE:

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[0070] b) The RSRP measurement performed on the received SCI format 1-A is Th(prio RX ,prio TX ) higher.

[0071] c)

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[0072] 7) Set S A The number of candidate single slot resources remaining in is X M total If less than Th(pi ,p j ) is the priority value Th(p i ,p j ) is increased by 3 dB and the procedure proceeds to step 4.

[0073] The methods and apparatus described herein may be applied to the 4G standard (TS 36.213) for the LTE sidelink. Similarly, the methods and apparatus described herein may be applied to the 5G standard (TS 38.214) for the NR sidelink. Similarly, the methods and apparatus described herein may be applied to the 5G standard (TS 38.214 v16.2.0 2020-06 or TS 38.214 v16.3.0 2020-09).

[0074] As mentioned above,

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[0075] FIG. 1 shows a flow diagram illustrating a data transmission method performed by a device configured for sidelink communication. At S100, a reception priority level of data to be received is determined. At S120, a transmission priority level of data to be transmitted is determined. At S140, a threshold is determined (e.g., based on the reception priority level and the transmission priority level). However, it is understood that the threshold may be determined based on any other mechanism. At S160, resources for sidelink communication may be excluded based on the threshold.

[0076] According to various embodiments, the receive priority level and / or the transmit priority level may be provided to the device by a higher communication layer.

[0077] According to various embodiments, the reception priority levels and / or transmission priority levels may be provided to the device in an SCI format, such as SCI format 1 or SCI format 1-A. For example, in an NR sidelink, the reception priority levels are provided in SCI format 1-A. For example, in an LTE sidelink, the reception priority levels are provided in SCI format 1.

[0078] According to various embodiments, the threshold may be determined based on a threshold index.

[0079] According to various embodiments, the threshold index i may be determined by the formula i=(a-1)x8+b, where a denotes the transmission priority level and b denotes the reception priority level.

[0080] According to various embodiments, the threshold may be determined based on a threshold index and a table of thresholds.

[0081] According to various embodiments, the data transmission method may further include resource sensing to determine the threshold value.

[0082] According to various embodiments, the data transmission method may further include determining whether to remove a resource from the list of candidate resources for sidelink communication based on the resource sensing and a threshold.

[0083] According to various embodiments, resource The sensing may include sensing in which partial sensing is configured, or may be sensing in which partial sensing is configured.

[0084] According to various embodiments, resource The sensing may include sensing in which partial sensing is not configured, or may be sensing in which partial sensing is not configured.

[0085] According to various embodiments, the apparatus may include or be a user equipment (UE), e.g., as shown in FIG. 2, and the sidelink communication may include or be communication between the user equipment and other user equipment.

[0086] According to various embodiments, the sidelink communication may include or be 4G based communication for sidelink communication.

[0087] According to various embodiments, the sidelink communication may include 5G based communication for sidelink communication or may be 5G based communication for sidelink communication.

[0088] According to various embodiments, sidelink communications may include or be communications via NR sidelink mode 2 operation.

[0089] According to various embodiments, the sidelink communications may include or may be communications via LTE Sidelink Mode 4 operation.

[0090] According to various embodiments, the threshold is determined based on the receiving priority level and the transmitting priority level.

[0091] An apparatus configured to perform the methods described herein may be, for example, a UE as shown in FIG.

[0092] According to various embodiments, an apparatus may include transmitting means configured to transmit data using sidelink communication and receiving means configured to receive data using sidelink communication.

[0093] According to various embodiments, an apparatus includes one or more processors and one or more memories that store program instructions, and is configured to perform the methods described herein when the program instructions are executed by the one or more processors.

[0094] A computer program may be provided comprising program instructions that, when executed by one or more processors in the apparatus, cause the apparatus to carry out the methods described herein.

[0095] A carrier (eg, a computer readable medium) may be provided for carrying a computer program as described herein.

[0096] The following references may be helpful in understanding this disclosure:

[0097] [Table 1]

[0098] Some of the abbreviations used in this disclosure are listed below.

[0099] [Table 2]

[0100] item: [Item 1] A data transmission method performed by a device configured for sidelink communication, comprising: determining a reception priority level of the received data; determining a transmission priority level for the data to be transmitted; and removing resources for the sidelink communication based on a threshold.

[0101] [Item 2] A data transmission method according to Item 1, wherein the receiving priority level and / or the transmitting priority level are provided to the device by an upper communication layer.

[0102] [Item 3] A data transmission method described in items 1 or 2, wherein the receiving priority level and / or the transmitting priority level are provided to the device in SCI format.

[0103] [Item 4] A data transmission method according to at least one of items 1 to 3, wherein the threshold is determined based on a threshold index.

[0104] [Item 5] A data transmission method according to Item 4, wherein the threshold index i is determined by the formula i=(a-1)×8+b, where a indicates the transmission priority level and b indicates the reception priority level.

[0105] [Item 6] A data transmission method according to at least one of Items 1 to 5, wherein the threshold is determined based on the threshold index and a threshold table.

[0106] [Item 7] A data transmission method described in at least one of items 1 to 6, further comprising resource sensing for determining a threshold value.

[0107] [Item 8] The data transmission method described in Item 7, further comprising a step of determining whether to exclude a resource from a list of candidate resources for sidelink communication based on the resource sensing and the threshold.

[0108] [Item 9] The above resource 9. The data transmission method according to claim 7 or 8, wherein the sensing comprises sensing that is configured as partial sensing.

[0109] [Item 10] The above resource 9. The data transmission method according to at least one of items 7 or 8, wherein the sensing comprises sensing in which partial sensing is not configured.

[0110] [Item 11] A data transmission method described in at least one of items 1 to 10, wherein the device includes a user equipment (UE), and the sidelink communication includes communication between the user equipment and another user equipment.

[0111] [Item 12] A data transmission method described in at least one of items 1 to 11, wherein the sidelink communication includes communication via 4G sidelink communication.

[0112] [Item 13] A data transmission method described in at least one of items 1 to 12, wherein the sidelink communication includes communication via 5G sidelink communication.

[0113] [Item 14] A data transmission method described in at least one of items 1 to 13, wherein the sidelink communication includes communication by operation of NR sidelink mode 2.

[0114] [Item 15] A data transmission method described in at least one of items 1 to 14, wherein the sidelink communication includes communication by operation of LTE sidelink mode 4.

[0115] [Item 16] The data transmission method according to at least one of Items 1 to 15, wherein the threshold value is determined based on the reception priority level and the transmission priority level.

[0116] [Item 17] A data transmission device configured for sidelink communication, comprising: a processing module for determining a receive priority level for data to be received and a transmit priority level for data to be transmitted; and an exclusion module for excluding resources for the sidelink communication based on a threshold.

[0117] [Item 18] The device described in Item 17, wherein the receiving priority level and / or the transmitting priority level are provided to the device by an upper communication layer.

[0118] [Item 19] An apparatus described in Items 17 or 18, wherein the receiving priority level and / or the transmitting priority level are provided to the apparatus in SCI format.

[0119] [Item 20] An apparatus described in at least one of Items 17 to 19, wherein the threshold is determined based on a threshold index.

[0120] [Item 21] The apparatus described in Item 20, wherein the threshold index i is determined by the formula i=(a-1)×8+b, where a indicates the transmission priority level and b indicates the reception priority level.

[0121] [Item 22] An apparatus described in at least one of Items 17 to 21, wherein the threshold is determined based on the threshold index and a table of thresholds.

[0122] [Item 23] An apparatus described in at least one of Items 17 to 22, wherein the processing module is configured to perform resource sensing to determine a threshold value.

[0123] [Item 24] The device described in Item 23, wherein the processing module is configured to determine whether to exclude a resource from a list of candidate resources for sidelink communication based on the resource sensing and the threshold.

[0124] [Item 25] The above resource 25. The apparatus according to claim 23 or 24, wherein the sensing comprises sensing in which partial sensing is configured.

[0125] [Item 26] The above resource 25. The apparatus of claim 23 or 24, wherein the sensing comprises sensing in which partial sensing is not configured.

[0126] [Item 27] ​​The device includes a user equipment (UE), and the sidelink communication includes communication between the user equipment and another user equipment, the device being described in at least one of items 17 to 26.

[0127] [Item 28] An apparatus described in at least one of Items 17 to 27, wherein the sidelink communication includes communication via 4G sidelink communication.

[0128] [Item 29] An apparatus described in at least one of items 17 to 28, wherein the sidelink communication includes communication via 5G sidelink communication.

[0129] [Item 30] An apparatus described in at least one of Items 17 to 29, wherein the sidelink communication includes communication via operation of NR sidelink mode 2.

[0130] [Item 31] An apparatus described in at least one of items 17 to 30, wherein the sidelink communication includes communication via operation of LTE sidelink mode 4.

[0131] [Item 32] The device described in at least one of Items 17 to 31, wherein the threshold is determined based on the receiving priority level and the transmitting priority level.

[0132] [Item 33] The data transmission device is equipped with one or more processors and one or more memories that store program instructions, and is configured to perform the method described in any one of items 1 to 16 when the program instructions are executed by the one or more processors.

[0133] [Item 34] A computer program comprising program instructions that, when executed by one or more processors in an apparatus, cause the apparatus to perform the method according to any one of items 1 to 16.

[0134] [Item 35] A non-transitory computer-readable medium having instructions that are executed by a processor to perform the method according to any one of items 1 to 16.

[0135] [Item 36] A chip having one or more processors configured to execute program instructions stored in one or more memories to perform the methods described in any one of items 1 to 16.

[0136] It should be understood that the present invention should not be limited by the details of the preceding description, but should rather be broadly interpreted based on the principles defined in the appended claims, and therefore all changes and modifications falling within the scope of the claims, or their equivalents, are intended to be included in the scope of protection. [Industrial Applicability]

[0137] The data transmission method, data transmission device, non-transitory computer-readable medium and chip for sidelink communication of the present invention can be utilized in communication technology. [Explanation of symbols]

[0138] S100, S120, S140, S160 Step

Claims

1. 1. A method of data transmission performed by a device configured for sidelink communication, comprising: determining a reception priority level of the received data; determining a transmission priority level for the data to be transmitted; and excluding resources for the sidelink communication based on a threshold. The method for transmitting data, characterized in that the threshold is determined based on a threshold index and used for comparison with a signal received power in the resources for the sidelink communication, the threshold index i being determined by the formula i=(a-1)x8+b, where a indicates the transmission priority level and b indicates the reception priority level.

2. 2. The method of claim 1, wherein the receiving priority level and / or the transmitting priority level is provided to the device by a higher communication layer.

3. 3. The method of claim 1 or 2, characterized in that the receiving priority level and / or the transmitting priority level are provided to the device in a sidelink control information (SCI) format.

4. The data transmission method according to any one of claims 1 to 3, characterized in that the threshold is determined based on a threshold index and a table of thresholds.

5. The method of data transmission according to any one of claims 1 to 4, further comprising resource sensing for determining a threshold value.

6. 6. The method of claim 5, further comprising the step of determining whether to exclude the resource from a list of candidate resources for sidelink communication based on the resource sensing and the threshold.

7. 7. The method of claim 5 or 6, wherein the resource sensing comprises sensing that comprises partial sensing.

8. 7. The method of claim 5 or 6, wherein the resource sensing comprises sensing in which partial sensing is not configured.

9. The data transmission method according to any one of claims 1 to 8, wherein the sidelink communication comprises communication by operation of new radio (NR) sidelink mode 2.

10. A data transmission device, A data transmission device, comprising one or more processors configured to cause the data transmission device to perform the method of any one of claims 1 to 9 when program instructions stored in one or more memories are executed by the one or more processors.

11. A non-transitory computer readable medium, characterized in that it stores computer executable instructions for causing said device to carry out the method according to any one of claims 1 to 9.

12. A chip, A chip comprising one or more processors configured to cause a device comprising the chip to execute program instructions stored in one or more memories to perform the method according to any one of claims 1 to 9.

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