CN111130724A - Feedback method and device for V2X transmission and user equipment - Google Patents
Feedback method and device for V2X transmission and user equipment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
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Abstract
The invention provides a feedback method and device for V2X transmission and user equipment. The method comprises the following steps: receiving SCI sent by a sending end UE and V2X data located on PSSCH, wherein the SCI indicates transmission resource occupied by the V2X data on PSSCH; and sending feedback information to the sending end UE on one or more frequencies. The invention can realize flexible same-carrier feedback or cross-carrier feedback according to the capability of the UE and the wireless environment.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a feedback method and apparatus for V2X transmission, and a user equipment.
Background
In Release 12, ProSe (Proximity-based Services) direct communication is introduced in LTE (Long Term Evolution). UE a and UE B (which may be multiple UEs) may communicate directly therebetween via a PC5 interface.
There are two modes of resource allocation, one is a Scheduled resource allocation (Scheduled resource allocation), which is configured by the base station through dedicated signaling; one is an automatic Resource Selection (automatic Resource Selection) mode, in which a base station may provide a Resource pool for direct communication to a UE through a system message or a Radio Resource Control (RRC) signaling, and the UE selects a Resource for direct communication from the Resource pool. If the transmitted UE (Transmitter UE) is not in the network coverage range, the UE selects resources for direct communication from a pre-configured resource pool in an automatic resource selection mode.
Vehicle-to-evolution (V2X) is also supported by 3GPP (3rd Generation Partnership Project) based on direct communication. Within network coverage, a certain UE may send a V2X message to multiple UEs. It should be noted that both the receiving UE and the sending UE may not be in the network coverage, or some UEs may be in the network coverage.
Currently, 3GPP is investigating the introduction of V2X in 5G (i.e., New Radio, NR). Because the 5G system can provide larger bandwidth and lower time delay, the service requirement of V2X can be better met. And 3GPP has agreed that NR V2X may transmit V2X traffic in unicast (unicast), multicast (groupcast) or broadcast manner. When the transmitting UE uses unicast or multicast, feedback can be introduced, however how to implement feedback of V2X is a problem to be solved.
Disclosure of Invention
The feedback method, the device and the user equipment for V2X transmission provided by the invention can realize flexible same-carrier feedback or cross-carrier feedback according to the capability of the UE and the wireless environment.
In a first aspect, the present invention provides a feedback method for V2X transmission, including:
receiving SCI sent by a sending end UE and V2X data located on PSSCH, wherein the SCI indicates transmission resource occupied by the V2X data on PSSCH;
and sending feedback information to the sending end UE on one or more frequencies.
Optionally, the sending feedback information to the sending-end UE on one or more frequencies includes: and sending feedback information to the sending-end UE on the frequency of receiving the V2X data.
Optionally, the information that needs to be fed back is known from the SCI.
Optionally, when the sender UE sends V2X data on multiple carriers simultaneously or in a time-sharing manner, the sending feedback information to the sender UE on one or more frequencies includes: and sending feedback information to the sending end UE in a cross-carrier mode according to the transmitting capacity and the channel environment of the sending end UE.
Optionally, the feedback information includes status information of V2X received on each carrier; or, the feedback information further includes the fed back receiving frequency information; or, the feedback information further includes a logical channel identifier.
Optionally, the sending, to the sending end UE, feedback information in a cross-carrier manner according to the self transmitting capability and the channel environment of the sending end UE includes:
sending feedback information to the sending-end UE only on one or partial frequency where the V2X data is received; or,
sending feedback information to the sending end UE only on the frequency where the V2X data is not received; or,
one part of the feedback information is sent to the sending-end UE on the frequency of receiving V2X data, and the other part of the feedback information is sent to the sending-end UE on the frequency of not receiving V2X data.
Optionally, the sending feedback information to the sending-end UE on one or more frequencies includes: preferentially sending feedback information to the sending end UE at the frequency of the currently received V2X data, and when the self capability does not support or a proper transmission feedback resource is not found, selecting other frequencies to send the feedback information to the sending end UE.
Optionally, the sending feedback information to the sending-end UE on one or more frequencies includes: and sending feedback information to the sending end UE according to the feedback frequency information indicated in the SCI.
In a second aspect, the present invention provides a feedback apparatus for V2X transmission, including:
a receiving unit, configured to receive an SCI sent by a sending end UE and V2X data located on a PSSCH, where the SCI indicates a transmission resource occupied by the V2X data on the PSSCH;
a sending unit, configured to send feedback information to the sending-end UE on one or multiple frequencies.
Optionally, the sending unit is configured to send feedback information to the sending-end UE on a frequency where the V2X data is received.
Optionally, the information that needs to be fed back is known from the SCI.
Optionally, when the sending-end UE sends the V2X data on multiple carriers simultaneously or in a time-sharing manner, the sending unit is configured to send the feedback information to the sending-end UE in a cross-carrier manner according to its own transmission capability and its own channel environment.
Optionally, the feedback information includes status information of V2X received on each carrier; or, the feedback information further includes the fed back receiving frequency information; or, the feedback information further includes a logical channel identifier.
Optionally, the sending unit is configured to send feedback information to the sending-end UE only on one or a part of frequencies where V2X data are received; or,
sending feedback information to the sending end UE only on the frequency where the V2X data is not received; or,
one part of the feedback information is sent to the sending-end UE on the frequency of receiving V2X data, and the other part of the feedback information is sent to the sending-end UE on the frequency of not receiving V2X data.
Optionally, the sending unit is configured to preferentially send the feedback information to the sending end UE at a frequency where the V2X data is currently received, and select another frequency to send the feedback information to the sending end UE when the self capability does not support or a suitable transmission feedback resource is not found.
Optionally, the sending unit is configured to send feedback information to the sending end UE according to the feedback frequency information indicated in the SCI.
In a third aspect, the present invention provides a user equipment, where the user equipment includes the feedback device transmitted by V2X.
The feedback method, the device and the user equipment for V2X transmission provided by the embodiment of the invention receive SCI sent by a sending end UE and V2X data located on PSSCH, the SCI indicates transmission resources occupied by the V2X data on the PSSCH, and the feedback information is sent to the sending end UE on one or more frequencies, so that flexible co-carrier feedback or cross-carrier feedback can be realized according to the capability of the UE and the wireless environment.
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Fig. 1 is a flowchart of a feedback method for V2X transmission according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a feedback device transmitted by V2X according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a feedback method for V2X transmission, where the method is applied to a receiving end UE, and as shown in fig. 1, the method includes:
s11, the receiving end UE receives SCI (Sidelink Control Information, direct link Control signaling) sent by the sending end UE and V2X data located on a PSSCH (Physical Sidelink Shared Channel), where the SCI indicates a transmission resource occupied by the V2X data on the PSSCH.
In 5G, it has not been determined whether the direct interface between UEs still continues to use the PC5 interface. For simplicity, the PC5 interface refers to the direct interface between UEs in the present invention, the physical layer control signaling transmitted through the PC5 interface is referred to as SCI, and the V2X data transmitted over the direct interface is located in the PSSCH.
S12, the receiving end UE sends feedback information to the sending end UE on one or more frequencies.
In the feedback method for V2X transmission provided in the embodiments of the present invention, a receiving end UE receives an SCI sent by a sending end UE and V2X data located on a PSSCH, where the SCI indicates a transmission resource occupied by the V2X data on the PSSCH, and the receiving end UE sends feedback information to the sending end UE on one or more frequencies, so that flexible co-carrier feedback or cross-carrier feedback can be implemented according to the capability of the UE and a wireless environment. Generally, the sending end UE may indicate that the receiving end UE needs to send feedback information to the sending end UE through the SCI, and the sending end UE may also indicate that the receiving end UE needs to send feedback information to the receiving end UE through the layer 2 or layer 3 control signaling.
Generally, for the same transmitting-end UE, the number of frequencies for receiving V2X data by the receiving-end UE is equal to or greater than the number of frequencies for sending feedback information by the receiving-end UE.
The following describes the feedback method of the transmission of V2X according to the embodiment of the present invention.
In this embodiment, both the UE a as the transmitting side and the UE B as the receiving side support 5G V2X, the embodiment takes a unicast scenario as an example for explanation, and is also applicable to multicast, in a multicast scenario, the receiving side UE may be one or more, and the following schemes are respectively adopted by a plurality of UEs.
UE a located in serving Cell 1(Cell 1) expects to send V2X data to surrounding UE B, which may be located in serving Cell 1, or in a neighboring Cell, or not within network coverage.
UE a may make the V2X transmission by network assistance or by direct discovery to ascertain that UE B is nearby.
UE a may request Cell 1 for transmission resources for transmitting V2X service, or may select transmission resources for transmitting V2X using a resource pool broadcasted in the system message of Cell 1. When UE a transmits V2X traffic to UE B, it typically contains direct link control signaling SCI and data located on the psch. SCI indicates information such as transmission resources occupied by V2X data on the psch. The SCI may also indicate that UE B needs feedback information after receiving V2X data.
The UE B learns the receiving resource pool needing to receive the V2X through system messages in the cell where the UE B resides, or adopts a pre-configured resource pool to receive the V2X when the UE B is out of the network coverage.
UE a may have the capability of performing V2X transmission on multiple carriers simultaneously or in a time-sharing manner, where the transmission resources on these multiple carriers may be allocated by Cell 1, or partly by Cell 1, and others by the strongest Cell on the frequency where it is located. Such as uplink carrier F1 of Cell 1, Cell 1 may allocate transmission resources on F1 for UE a; UE a also expects to transmit V2X on carrier F2, and detects that the strongest Cell on F2 (in TDD, the uplink and downlink carriers of the Cell are the same; in FDD, the uplink and downlink carriers of the Cell are different, because V2X transmits the timeslot located in the uplink carrier, and therefore UE detects the downlink carrier corresponding to F2 to obtain the strongest Cell) is Cell 3, and UE a can obtain the resource pool configured for V2X transmission from the system message of Cell 3, and select a suitable resource to transmit V2X service.
Suppose UE a transmits V2X traffic to UE B through F1, F2, and F3 at the same time, and different V2X traffic may be transmitted on different carriers, and the same V2X traffic may also be transmitted.
UE B simultaneously turns on the receiving functions at F1, F2, and F3, and can receive the V2X traffic from UE a on these three carriers.
The UE B may learn from the SCI sent by the UE a that feedback is needed, and perform feedback in one of the following feedback manners:
1. UE B sends feedback to UE a on the frequency at which V2X data was received. At this time, the feedback frequency and the receiving frequency are in one-to-one correspondence, that is, UE B receives V2X data at F1, and transmits the receiving status of the received V2X data at the current frequency, such as ACK or NACK, to UE a at F1. The feedback may be resource-selected from an independent feedback resource pool configured by the network to transmit feedback information, or may be dedicated feedback resource allocated by the cell in which the UE B is located. The information fed back may include information such as the identity of the transmitting UE, the identity of the receiving UE, and the sequence number of the received V2X data, in addition to ACK/NACK.
2. The UE B performs feedback in a cross-carrier manner according to its own transmitting capability and its own channel environment, which may specifically be:
UE B sends feedback to UE a on only one or a subset of carriers, e.g., F1, the feedback information including the status information of V2X received by UE B on F1, F2, F3. The carrier is the carrier where the V2X data is received or the carrier where the V2X data is not received.
For cross-carrier feedback, UE B may indicate the fed back receiving frequency information, so that UE a can identify the transmission data corresponding to the feedback information. If UE B can encode the feedback information according to the frequency information at a certain moment, the reception status at F1 is ACK, the reception status at F2 is NACK, the reception status at F3 is ACK, UE B can be encoded as F1, ACK; f2, NACK; f3, ACK. Since UE a may transmit V2X data of multiple logical channels on one frequency, the feedback information may further need to add information such as logical channel identifier, so that the sending UE can easily identify which V2X data have received reception acknowledgements and which have not received reception acknowledgements when receiving the feedback information.
UE B may send feedback to UE a on one or more different receive frequencies, e.g., UE B may send feedback to UE a on frequency F1 for receiving V2X data on F1, and send feedback to UE a on F4 for receiving V2X data on F2 and F3. UE B does not select the receiving frequency to send feedback, sometimes because UE B has insufficient capability, and sometimes because UE B does not find a transmission resource with small interference on the receiving frequency for feedback. The resource for transmitting feedback may be shared by multiple UEs, and if the number of other UEs using the feedback resource is large, the interference on the resource for transmitting feedback may be strong.
3. The UE B preferentially feeds back on the frequency for receiving the V2X data currently, if the UE capability does not support or does not find a proper resource for transmitting the feedback, the UE B selects other frequencies for feeding back, indicates the frequency for receiving the V2X data in the feedback, optionally includes logical channel information and the like, the logical channel is used for representing different V2X services, the UE A may send multiple V2X services to the UE B, the multiple V2X services are mapped onto different logical channels, and the logical channel is indicated in the feedback information so that the UE A can accurately position the transmission state of the V2X service corresponding to the feedback information.
4. In order to reduce the complexity of UE a detecting feedback, UE a may indicate feedback frequency information in SCI, e.g. may indicate that feedback is only performed on V2X data on three receiving frequencies at F1, and UE B sends feedback information to UE a according to the feedback frequency information indicated in the SCI.
It should be noted that when the feedback is required to be clear after the UE B receives the V2X data of the UE a, the protocol may set a fixed time, for example, the feedback is performed after receiving 4 slots after the V2X data, or the feedback slot may be indicated by the SCI.
An embodiment of the present invention further provides a feedback apparatus for V2X transmission, where the apparatus is located at a receiving end UE, and as shown in fig. 2, the apparatus includes:
a receiving unit 11, configured to receive an SCI sent by a sending UE and V2X data located on a PSSCH, where the SCI indicates a transmission resource occupied by the V2X data on the PSSCH;
a sending unit 12, configured to send feedback information to the sending-end UE on one or more frequencies.
In the feedback device for V2X transmission provided in the embodiments of the present invention, a receiving end UE receives an SCI sent by a sending end UE and V2X data located on a PSSCH, where the SCI indicates a transmission resource occupied by the V2X data on the PSSCH, and the receiving end UE sends feedback information to the sending end UE on one or more frequencies, so that flexible co-carrier feedback or cross-carrier feedback can be implemented according to the capability of the UE and a wireless environment.
Optionally, the sending unit 12 is configured to send feedback information to the sending-end UE on a frequency where V2X data is received.
Wherein information requiring feedback is known from the SCI.
Optionally, when the sending-end UE sends the V2X data on multiple carriers simultaneously or in a time-sharing manner, the sending unit 12 is configured to send the feedback information to the sending-end UE in a cross-carrier manner according to its own transmission capability and its own channel environment.
Wherein the feedback information comprises state information of V2X received on each carrier; or, the feedback information further includes the fed back receiving frequency information; or, the feedback information further includes a logical channel identifier.
Optionally, the sending unit 12 is configured to send feedback information to the sending-end UE only on one or a part of frequencies where V2X data is received; or,
sending feedback information to the sending end UE only on the frequency where the V2X data is not received; or,
one part of the feedback information is sent to the sending-end UE on the frequency of receiving V2X data, and the other part of the feedback information is sent to the sending-end UE on the frequency of not receiving V2X data.
Optionally, the sending unit 12 is configured to preferentially send the feedback information to the sending end UE at a frequency where the V2X data is currently received, and select another frequency to send the feedback information to the sending end UE when the self capability does not support or a suitable transmission feedback resource is not found.
Optionally, the sending unit 12 is configured to send feedback information to the sending end UE according to the feedback frequency information indicated in the SCI.
The apparatus of this embodiment may be configured to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
The embodiment of the present invention further provides a user equipment, where the user equipment includes the feedback device transmitted by V2X.
It will be understood by those skilled in the art that all or part of the processes of the embodiments of the methods described above may be implemented by a computer program, which may be stored in a computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (17)
1. A feedback method for V2X transmission, comprising:
receiving direct link control signaling SCI sent by a sending end UE and V2X data located on a physical direct link shared channel PSSCH, wherein the SCI indicates transmission resources occupied by the V2X data on the PSSCH;
and sending feedback information to the sending end UE on one or more frequencies.
2. The method of claim 1, wherein the sending feedback information to the transmitting UE on one or more frequencies comprises: and sending feedback information to the sending-end UE on the frequency of receiving the V2X data.
3. The method of claim 1 wherein the information requiring feedback is known from the SCI.
4. The method of claim 1, wherein when the sender UE sends V2X data on multiple carriers simultaneously or in a time-sharing manner, the sending feedback information to the sender UE on one or more frequencies comprises: and sending feedback information to the sending end UE in a cross-carrier mode according to the transmitting capacity and the channel environment of the sending end UE.
5. The method of claim 4, wherein the feedback information comprises status information of V2X received on each carrier; or, the feedback information further includes the fed back receiving frequency information; or, the feedback information further includes a logical channel identifier.
6. The method of claim 4, wherein the sending feedback information to the sending-end UE in a cross-carrier manner according to its own transmission capability and its own channel environment comprises:
sending feedback information to the sending-end UE only on one or partial frequency where the V2X data is received; or,
sending feedback information to the sending end UE only on the frequency where the V2X data is not received; or,
one part of the feedback information is sent to the sending-end UE on the frequency of receiving V2X data, and the other part of the feedback information is sent to the sending-end UE on the frequency of not receiving V2X data.
7. The method of claim 1, wherein the sending feedback information to the transmitting UE on one or more frequencies comprises: preferentially sending feedback information to the sending end UE at the frequency of the currently received V2X data, and when the self capability does not support or a proper transmission feedback resource is not found, selecting other frequencies to send the feedback information to the sending end UE.
8. The method of claim 1, wherein the sending feedback information to the transmitting UE on one or more frequencies comprises: and sending feedback information to the sending end UE according to the feedback frequency information indicated in the SCI.
9. A feedback apparatus for V2X transmission, comprising:
a receiving unit, configured to receive an SCI sent by a sending end UE and V2X data located on a PSSCH, where the SCI indicates a transmission resource occupied by the V2X data on the PSSCH;
a sending unit, configured to send feedback information to the sending-end UE on one or multiple frequencies.
10. The apparatus of claim 9, wherein the sending unit is configured to send the feedback information to the sending-end UE on a frequency where V2X data is received.
11. The apparatus of claim 9 wherein the information requiring feedback is known from the SCI.
12. The apparatus of claim 9, wherein when the sending-end UE sends V2X data on multiple carriers simultaneously or in a time-sharing manner, the sending unit is configured to send the feedback information to the sending-end UE in a cross-carrier manner according to its own transmission capability and its own channel environment.
13. The apparatus of claim 12, wherein the feedback information comprises status information of V2X received on each carrier; or, the feedback information further includes the fed back receiving frequency information; or, the feedback information further includes a logical channel identifier.
14. The apparatus of claim 12, wherein the sending unit is configured to send feedback information to the sending-end UE only on one or a part of frequencies where V2X data is received; or,
sending feedback information to the sending end UE only on the frequency where the V2X data is not received; or,
one part of the feedback information is sent to the sending-end UE on the frequency of receiving V2X data, and the other part of the feedback information is sent to the sending-end UE on the frequency of not receiving V2X data.
15. The apparatus of claim 9, wherein the sending unit is configured to send the feedback information to the sending-end UE preferentially at a frequency where V2X data is currently received, and when the capability of the sending-end UE does not support or a suitable transmission feedback resource is not found, select another frequency to send the feedback information to the sending-end UE.
16. The apparatus of claim 9, wherein the sending unit is configured to send feedback information to the sender-side UE according to the feedback frequency information indicated in the SCI.
17. A user equipment, characterized in that it comprises feedback means of the V2X transmission according to any of claims 9 to 16.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811286688.9A CN111130724B (en) | 2018-10-31 | 2018-10-31 | Feedback method and device for V2X transmission and user equipment |
| PCT/CN2019/105077 WO2020088112A1 (en) | 2018-10-31 | 2019-09-10 | V2x transmission feedback method and apparatus, and user equipment |
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| CN201811286688.9A CN111130724B (en) | 2018-10-31 | 2018-10-31 | Feedback method and device for V2X transmission and user equipment |
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Non-Patent Citations (1)
| Title |
|---|
| CMCC: "Discussion on channel design of HARQ and CSI feedback for V2X", 《3GPP TSG RAN WG1 MEETING #94BIS，R1-1811036，CHENGDU, CHINA, OCTOBER 8TH – 12TH, 2018》 * |
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| Publication number | Publication date |
|---|---|
| WO2020088112A1 (en) | 2020-05-07 |
| CN111130724B (en) | 2021-05-25 |
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