WO2021016805A1 - Resource selection method and apparatus - Google Patents

Abstract

The embodiments in the present application provide a resource selection method and apparatus. The method comprises: when a candidate resource and a reserved resource overlap, a terminal device comparing a corresponding resource selection threshold for the candidate resource and a measurement result for the reserved resource, wherein at least two types of candidate resource correspond to different resource selection thresholds; according to a comparison result, determining whether to remove the candidate resource or whether to lower a priority level for the candidate resource.

Description

Resource selection method and device Technical field

The embodiments of the application relate to the field of communication technology.

Background technique

V2X (Vehicle to Everything) is a vehicle communication technology. The sending device of V2X communicates directly with the receiving device through a sidelink. Long Term Evolution (LTE, Long Term Evolution) V2X only supports broadcast services at the physical layer, such as broadcasting road safety information. Periodic business is the main business of LTE V2X, so LTE V2X is mainly designed and optimized for periodic business. LTE V2X does not support hybrid automatic repeat request (HARQ, Hybrid Automatic Repeat reQuest) feedback (which can be called HARQ-ACK, including ACK and NACK) and channel state information (CSI, Channel State Information) feedback.

New Radio (NR, New Radio) V2X is an important project of 5G NR. Compared with LTE V2X, NR V2X needs to support many new scenarios and new services, such as remote driving, autonomous driving, and fleet driving. It also needs to meet higher requirements. Technical indicators, such as high reliability, low latency, high data rate, etc. Therefore, in addition to broadcast services, NR V2X also provides support for unicast services and multicast services; in addition to periodic services, NR V2X also needs to support aperiodic services, and NR V2X supports HARQ-ACK and CSI feedback.

At present, NR V2X defines the physical side link control channel (PSCCH, Physical Sidelink Control Channel), the physical side link shared channel (PSSCH, Physical Sidelink Shared Channel), and the physical side link feedback channel (PSFCH, Physical Sidelink Feedback Channel) , Respectively used to carry control information, data information and feedback information.

Compared with LTE V2X, NR V2X newly introduces HARQ mechanism, including HARQ-ACK feedback, HARQ-based retransmission, etc. In addition, time slot aggregation is also a new feature discussed in NR V2X. It uses time-continuous time slots for transmission. Since more resources are used, it can carry a larger data load and/or improve transmission reliability.

On the other hand, similar to Mode 3 and Mode 4 defined by LTE V2X, NR V2X also defines two working modes. For NR V2X mode 1 (Mode 1), the time-frequency resources (hereinafter referred to as resources) used by terminal equipment for V2X communication are scheduled by network equipment (such as base stations); for NR V2X mode 2 (Mode 2), the terminal equipment can Based on the perception result, the resource for V2X communication is selected autonomously. The sensing can include SCI decoding, side link signal measurement and so on.

It should be noted that the above introduction to the technical background is only for the convenience of a clear and complete description of the technical solution of the present application, and to facilitate the understanding of those skilled in the art. It should not be considered that the above technical solutions are well-known to those skilled in the art just because these solutions are described in the background art part of this application.

Summary of the invention

The inventor found that by following the design of LTE V2X, NR V2X mode 2 can support basic PSSCH collision avoidance and resource reuse. However, the current solution does not provide good support for the newly introduced HARQ features of NR V2X, for example, HARQ cannot be avoided. -The PSFCH collision of ACK cannot reuse the resources reserved for HARQ retransmission, etc.

In view of at least one of the above-mentioned problems, embodiments of the present application provide a resource selection method and device.

According to an aspect of the embodiments of the present application, a resource selection method is provided, including:

When the candidate resource and the reserved resource overlap, the terminal device compares the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, wherein at least two types of candidate resources correspond to different resource selection thresholds; as well as

According to the comparison result, it is determined whether to exclude the candidate resource or whether to reduce the priority of the candidate resource.

According to another aspect of the embodiments of the present application, there is provided a resource selection device, including:

The comparing unit compares the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource when the candidate resource and the reserved resource overlap, wherein at least two types of candidate resources correspond to different resource selections Threshold; and

A determining unit, which determines whether to exclude the candidate resource or whether to reduce the priority of the candidate resource according to the comparison result.

According to another aspect of the embodiments of the present application, a communication system is provided, including:

A terminal device that compares the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource when the candidate resource and the reserved resource overlap, wherein at least two types of candidate resources correspond to different resource selections Threshold; and determining whether to exclude the candidate resource or whether to reduce the priority of the candidate resource according to the comparison result.

One of the beneficial effects of the embodiments of the present application is that when the candidate resource and the reserved resource overlap, the terminal device compares the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, wherein at least two types of candidate resources Corresponding to different resource selection thresholds; and determining whether to exclude candidate resources or reduce the priority of candidate resources according to the comparison result. As a result, it is possible to provide good support for the HARQ feature introduced by NR V2X.

With reference to the following description and drawings, specific implementations of the application are disclosed in detail, and the manner in which the principles of the application can be adopted is indicated. It should be understood that the scope of the implementation of the present application is not limited thereby. Within the scope of the spirit and terms of the appended claims, the implementation of the present application includes many changes, modifications and equivalents.

Features described and/or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or substituted for features in other embodiments .

It should be emphasized that the term "comprising/comprising" when used herein refers to the existence of features, components, steps or components, but does not exclude the existence or addition of one or more other features, components, steps or components.

Description of the drawings

The elements and features described in one drawing or one embodiment of the embodiment of the present application may be combined with the elements and features shown in one or more other drawings or embodiments. In addition, in the drawings, similar reference numerals indicate corresponding parts in several drawings, and may be used to indicate corresponding parts used in more than one embodiment.

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application;

Figure 2 is a schematic diagram of a resource selection method according to an embodiment of the present application;

FIG. 3 is an example diagram of side link communication according to an embodiment of the present application;

FIG. 4 is another example diagram of side link communication according to an embodiment of the present application;

FIG. 5 is an example diagram of candidate resources and reserved resources in an embodiment of the present application;

FIG. 6 is another example diagram of candidate resources and reserved resources in an embodiment of the present application;

FIG. 7 is an example diagram of side link communication and candidate resources in an embodiment of the present application;

FIG. 8 is an example diagram of candidate resources in an embodiment of the present application;

FIG. 9 is another example diagram of candidate resources in an embodiment of the present application;

FIG. 10 is another example diagram of candidate resources according to an embodiment of the present application;

FIG. 11 is another example diagram of candidate resources according to an embodiment of the present application;

FIG. 12 is an example diagram of reserving resources for retransmission according to an embodiment of the present application;

FIG. 13 is another example diagram of candidate resources according to an embodiment of the present application;

FIG. 14 is another example diagram of candidate resources according to an embodiment of the present application;

FIG. 15 is another example diagram of candidate resources according to an embodiment of the present application;

FIG. 16 is another example diagram of candidate resources according to an embodiment of the present application;

FIG. 17 is another example diagram of candidate resources according to an embodiment of the present application;

FIG. 18 is a schematic diagram of a perception window and a resource selection window of an embodiment of the present application;

FIG. 19 is a schematic diagram of a resource selection device according to an embodiment of the present application;

FIG. 20 is a schematic diagram of a network device according to an embodiment of the present application;

FIG. 21 is a schematic diagram of a terminal device according to an embodiment of the present application.

Detailed ways

With reference to the drawings, the foregoing and other features of this application will become apparent through the following description. In the specification and drawings, specific implementations of the application are specifically disclosed, which indicate some implementations in which the principles of the application can be adopted. It should be understood that the application is not limited to the described implementations, on the contrary, the The application includes all modifications, variations and equivalents falling within the scope of the appended claims.

In the embodiments of this application, the terms "first", "second", etc. are used to distinguish different elements from the terms, but they do not indicate the spatial arrangement or temporal order of these elements. These elements should not be used by these terms. Limited. The term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprising", "including", "having" and the like refer to the existence of the stated features, elements, elements or components, but do not exclude the presence or addition of one or more other features, elements, elements or components.

In the embodiments of the present application, the singular forms "a", "the", etc. include plural forms, which should be broadly understood as "a" or "a type" rather than being limited to the meaning of "a"; in addition, the term "so" "Said" should be understood to include both singular and plural forms, unless the context clearly indicates otherwise. In addition, the term "based on" should be understood as "based at least in part on..." and the term "based on" should be understood as "based at least in part on..." unless the context clearly dictates otherwise.

In the embodiments of this application, the term "communication network" or "wireless communication network" may refer to a network that meets any of the following communication standards, such as Long Term Evolution (LTE), and Enhanced Long Term Evolution (LTE-A, LTE-A). Advanced), Wideband Code Division Multiple Access (WCDMA, Wideband Code Division Multiple Access), High-Speed Packet Access (HSPA, High-Speed Packet Access), etc.

In addition, the communication between devices in the communication system can be carried out according to any stage of communication protocol, for example, it can include but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and 5G , New Radio (NR, New Radio), etc., and/or other currently known or future communication protocols.

In the embodiments of the present application, the term “network device” refers to, for example, a device in a communication system that connects a terminal device to a communication network and provides services for the terminal device. Network equipment may include but is not limited to the following equipment: base station (BS, Base Station), access point (AP, Access Point), transmission and reception point (TRP, Transmission Reception Point), broadcast transmitter, mobile management entity (MME, Mobile Management Entity), gateway, server, radio network controller (RNC, Radio Network Controller), base station controller (BSC, Base Station Controller), etc.

Among them, the base station may include but is not limited to: Node B (NodeB or NB), evolved Node B (eNodeB or eNB), 5G base station (gNB), etc., and may also include remote radio head (RRH, Remote Radio Head) , Remote Radio Unit (RRU, Remote Radio Unit), relay (relay) or low-power node (such as femeto, pico, etc.). And the term "base station" can include some or all of their functions, and each base station can provide communication coverage for a specific geographic area. The term "cell" may refer to a base station and/or its coverage area, depending on the context in which the term is used.

In the embodiments of the present application, the term "User Equipment" (UE, User Equipment) or "Terminal Equipment" (TE, Terminal Equipment or Terminal Device), for example, refers to a device that accesses a communication network through a network device and receives network services. The terminal device may be fixed or mobile, and may also be called a mobile station (MS, Mobile Station), terminal, subscriber station (SS, Subscriber Station), access terminal (AT, Access Terminal), station, etc.

Among them, terminal devices may include but are not limited to the following devices: cellular phones (Cellular Phone), personal digital assistants (PDAs, Personal Digital Assistant), wireless modems, wireless communication devices, handheld devices, machine-type communication devices, laptop computers, Cordless phones, smart phones, smart watches, digital cameras, etc.

For another example, in scenarios such as the Internet of Things (IoT), a terminal device may also be a machine or device that performs monitoring or measurement. For example, it may include, but is not limited to: Machine Type Communication (MTC) terminals, Vehicle-mounted communication terminals, device to device (D2D, Device to Device) terminals, machine to machine (M2M, Machine to Machine) terminals, etc.

In addition, the term "network side" or "network device side" refers to a side of the network, which may be a certain base station, or may include one or more network devices as described above. The term "user side" or "terminal side" or "terminal device side" refers to a side of a user or terminal, which may be a certain UE, or may include one or more terminal devices as above. Unless otherwise specified in this article, "device" can refer to network equipment or terminal equipment.

The following uses examples to illustrate the scenarios of the embodiments of the present application, but the present application is not limited to this.

FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present application, schematically illustrating a case where a terminal device and a network device are taken as an example. As shown in FIG. 1, the communication system 100 may include a network device 101 and terminal devices 102 and 103. For the sake of simplicity, FIG. 1 only uses two terminal devices and one network device as an example for description, but the embodiment of the present application is not limited to this.

In the embodiment of the present application, the network device 101 and the terminal devices 102 and 103 can perform existing service or service transmission that can be implemented in the future. For example, these services may include, but are not limited to: enhanced Mobile Broadband (eMBB), massive machine type communication (mMTC, massive Machine Type Communication), and high-reliability, low-latency communication (URLLC, Ultra-Reliable and Low). -Latency Communication), etc.

It is worth noting that FIG. 1 shows that two terminal devices 102 and 103 are both within the coverage of the network device 101, but the application is not limited to this. The two terminal devices 102 and 103 may not be within the coverage area of the network device 101, or one terminal device 102 is within the coverage area of the network device 101 and the other terminal device 103 is outside the coverage area of the network device 101.

In the embodiment of the present application, side link transmission may be performed between the two terminal devices 102 and 103. For example, the two terminal devices 102 and 103 may both perform side link transmission within the coverage area of the network device 101 to implement V2X communication, or both may perform side link transmission outside the coverage area of the network device 101 to implement V2X communication. For communication, it is also possible that one terminal device 102 is within the coverage area of the network device 101 and the other terminal device 103 is outside the coverage area of the network device 101 to perform side link transmission to implement V2X communication.

In the embodiment of the present application, the terminal device 102 and/or 103 can independently select the side link resource (that is, Mode 2). In this case, the side link transmission can be independent of the network device 101, that is, the network device 101 is optional of. In addition, it is also possible to combine the terminal device's autonomous selection of side link resources (that is, Mode 2) and the allocation of side link resources by the network device (that is, Mode 1); this is not limited in the embodiment of the application.

At present, NR V2X mode 2 is still in the open discussion stage in 3GPP, but at least some of the functions used to realize collision avoidance and resource reuse can follow the design principles of LTE V2X, which is also the independent resource selection mode of NR V2X mode 2. One of the functions. More specifically, for a terminal device operating in NR V2X mode 2, it can be known that a certain resource is reserved by other devices through sensing. The reserved resource in the embodiment of this application refers to, for example, reserved for PSCCH and/or PSSCH. resource of.

The terminal device can estimate the PSCCH/PSSCH received signal reference power (RSRP, Reference Signal Receiving Power) on the reserved resource. When the RSRP is greater than a certain threshold, it means that if the terminal device uses the reserved resource, it will experience strong interference Therefore, the terminal device will not select or use the reserved resource to avoid collision and interference; when the RSRP is less than or equal to a certain threshold, it means that even if the terminal device uses the reserved resource, the interference is acceptable. Within the range, the terminal device can still select and use the reserved resource, that is, reuse the resource, thereby improving the spectrum efficiency and resource utilization of the system.

Compared with LTE V2X, NR V2X newly introduces HARQ mechanism, including HARQ-ACK feedback, HARQ-based retransmission, etc. By following the mechanism of LTE V2X, NR V2X mode 2 can support PSSCH collision avoidance and resource reuse, but it cannot provide good support for the newly introduced HARQ features of NR V2X. For example, PSFCH collisions carrying HARQ-ACK cannot be avoided and cannot be reused. Resources reserved for HARQ retransmission, etc. In addition, the current NR V2X Mode 2 cannot avoid collisions when NR V2X uses time slot aggregation.

In the embodiments of the present application, some solutions for sensing and resource selection in NR V2X mode 2 are provided, and multiple thresholds are introduced for signal measurement results and/or distance measurement results obtained based on sensing. For example, when the terminal device selects resources for transmitting PSSCH, by setting a lower threshold for the PSSCH that may cause PSFCH collisions than other PSSCHs, collisions between PSFCHs can be avoided; by setting resources reserved for HARQ-based retransmission A higher threshold than other resources can improve the utilization of reserved but unused resources.

In addition, the embodiments of the present application also provide other solutions for sensing and resource selection in NR V2X mode 2. The terminal device excludes the time slots used by time slot aggregation that extend to its own resource selection window, which can avoid time-lag The time slots of the slot aggregation collide.

The following examples will further illustrate this application.

In the embodiments of the present application, V2X is taken as an example to describe PSFCH, etc., but the present application is not limited to this, and may also be applied to side link transmission scenarios other than V2X. In the following description, the terms "side link" and "V2X" can be interchanged without causing confusion, and the terms "PSFCH" and "physical side link feedback channel" or "side link feedback channel" can be Interchangeably, the terms "PSSCH" and "physical side link shared channel" or "side link data" or "side link data channel" can also be interchanged.

In this embodiment of the application, side link control information (SCI, Sidelink Control Information) is carried by PSCCH, side link data is carried by PSSCH, and side link feedback information (HARQ-ACK) is carried by PSFCH. In addition, sending or receiving PSSCH can be understood as sending or receiving side link data carried by PSSCH; sending or receiving PSFCH can be understood as sending or receiving side link feedback information carried by PSFCH.

Embodiments of the first aspect

The embodiment of the present application provides a resource selection method, which is described from the side of the first terminal device. The first terminal device serves as the sender and sends side link data to the second terminal device; and the first terminal device serves as the receiver and receives the side link feedback information sent by the second terminal device.

Fig. 2 is a schematic diagram of a resource selection method according to an embodiment of the present application. As shown in Fig. 2, the method includes:

201: When the candidate resource and the reserved resource overlap, the terminal device compares the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, where at least two types of candidate resources correspond to different resource selection thresholds; and

202. The terminal device determines, according to the comparison result, whether to exclude the candidate resource or whether to reduce the priority of the candidate resource.

It should be noted that Figure 2 above only schematically illustrates an embodiment of the present application, but the present application is not limited thereto. For example, the order of execution among various operations can be appropriately adjusted, and some other operations can be added or some operations can be reduced. Those skilled in the art can make appropriate modifications based on the foregoing content, and are not limited to the description of the foregoing FIG. 2.

The following first exemplifies the PSFCH collision in the embodiment of the present application. The overlap between the candidate resource and the reserved resource mentioned in the embodiment of the present application, for example, means that the candidate resource and the reserved resource overlap at least partially in the time domain and/or the frequency domain.

Fig. 3 is an example diagram of side link communication according to an embodiment of the present application. As shown in Fig. 3, device 1 sends side link data to device 2 via PSSCH, and based on the PSSCH decoding result, device 2 feeds back to device 1 via PSFCH HARQ-ACK (ACK or NACK). The device 1 needs to decide (or determine, select) resources for transmitting the PSSCH based on perception.

Assume that there are devices 3 and 4 communicating around. The SCI used for scheduling the PSSCH of the device 3 is actually equivalent to indicating the resources that need to be reserved in the future. By demodulating and decoding the SCI of the device 3, the device 1 can know the resources reserved by the device 3, and the device 1 can obtain the measurement results at the reserved resources, for example, obtain the RSRP of the PSSCH at the reserved resources.

Device 1 compares the RSRP with a certain threshold. When RSRP≤th_s1, device 1 can use resources that overlap with the reserved resources of device 3 for side link transmission; conversely, when RSRP>th_s1, device 1 cannot use Device 3 reserves overlapping resources for side link transmission. Assuming that the scenario in Figure 3 satisfies RSRP≤th_s1, device 1 can use resources that overlap with the reserved resources of device 3 for side link transmission. However, perceiving based on this criterion will cause problems in the case of Figure 4.

Fig. 4 is another example diagram of side link communication according to an embodiment of the present application. The difference from Fig. 3 is that device 4 in Fig. 4 needs to feed back HARQ-ACK to device 3 through PSFCH. Satisfying RSRP≤th_s1 only means that the interference caused by device 3 to device 1 receiving PSSCH is within an acceptable range, but because device 4 is close to device 1, and the PSFCH resource location is determined by the PSSCH resource location, device 4 will 1 Receiving PSFCH causes strong interference, so that device 1 cannot correctly decode the HARQ-ACK fed back by device 2.

For devices that need to receive HARQ-ACK feedback through PSFCH, not only need to avoid PSSCH interference, but also need to avoid PSFCH interference. In view of the above problems, for devices that send PSCCH/PSSCH and need to receive PSFCH feedback (for example, device 1 in FIG. 3 and FIG. 4), it is necessary to determine appropriate resources for sending PSCCH/PSSCH based on perception.

In response to the above problems, the embodiments of this application introduce multiple resource selection thresholds, for example, each type of candidate resource has an independent resource selection threshold; the thresholds corresponding to different types of candidate resources can be the same or different; and at least two types of candidate resources correspond to different The resource selection threshold.

In some embodiments, the measurement result of the reserved resource includes a signal measurement result between a terminal device and other terminal devices that reserve the reserved resource, and the resource selection threshold includes a signal threshold of the signal measurement result.

In some embodiments, the measurement result of the reserved resource includes a distance measurement result between the terminal device and other terminal devices that reserve the reserved resource, and the resource selection threshold includes a distance threshold of the distance measurement result.

For example, a sensing device (such as device 1 in Figure 3 and Figure 4, that is, a device that needs to send PSCCH/PSSCH) sends a message to other devices (such as device 3 in Figure 3 and Figure 4) to indicate the location of reserved resources. The reserved signal is demodulated and decoded to obtain the reserved resource positions of other devices.

The embodiment of the application does not limit the specific form of the above reserved signal. For example, the above reserved signal may be an SCI that schedules the PSSCH. The SCI also indicates the reserved resources while scheduling the PSSCH, or the above reserved signal may be only A standalone SCI for indicating reserved resources, that is, the SCI is not used for demodulation and decoding of the scheduled PSSCH, but only used for indicating reserved resources.

By demodulating and decoding the reserved signal, the sensing device can know the resources reserved by other devices, and the sensing device can obtain the signal measurement result (interference measurement result) at the reserved resource in some way, and/or, and The distance measurement result between other devices (for example, d in Figure 3 and Figure 4).

The above-mentioned signal measurement result can be at least one of the following: Reference Signal Received Power (RSRP); Received Signal Strength Indication (RSSI, Received Signal Strength Indication); Reference Signal Received Quality (RSRQ, Reference Signal Receiving Quality); Signal to Noise Ratio (SNR) , Signal to Noise Ratio); Signal to Interference and Noise Ratio (SINR, Signal to Interference plus Noise Ratio); but the implementation of this application is not limited to this.

For ease of presentation, the embodiments of the present application only take RSRP as an example for description, and other forms of signal measurement results can be easily extended and applied. For convenience, the embodiment of the present application also uses d to describe the foregoing distance. This application does not limit the specific method of obtaining RSRP and/or distance d. For example, the sensing device can estimate the RSRP at the reserved resource based on the nearest RSRP measurement result of other devices, and for example, the sensing device can decode other devices through demodulation. The SCI obtains the location information contained therein, and then calculates the distance d between other devices and itself based on its own location. This application does not impose restrictions on what kind of signal is used to perform RSRP measurement. For example, it may be based on PSSCH and/or PSCCH, that is, RSRP may be for PSSCH and/or PSCCH.

In some embodiments, the sensing device can obtain the size of the reserved resources by sensing, for example, the reserved resources occupy F1 (F1≥1) sub-channels in the frequency domain and T1 (T1≥1) in the time domain. 1) Slots, where the sub-channels can be defined similarly to LTE V2X, and one sub-channel contains several resource blocks (RB, Resource Block). In addition, the sensing device knows the size of the candidate resources for the PSCCH/PSSCH to be transmitted. For example, the PSCCH/PSSCH resource occupies F2 (F2≥1) subchannels in the frequency domain and T2 (T2≥1) in the time domain. Slots; the size of the candidate resource and the reserved resource may not be the same. In order to support HARQ-ACK feedback based on PSFCH, there is a one-to-one mapping relationship between PSFCH and PSCCH/PSSCH, that is, PSFCH resources are determined by PSCCH/PSSCH resources.

FIG. 5 is an exemplary diagram of candidate resources and reserved resources in an embodiment of the present application, and FIG. 6 is another exemplary diagram of candidate resources and reserved resources in an embodiment of the present application. As shown in Figures 5 and 6, candidate resources and reserved resources have different sizes. When the candidate resource overlaps the reserved resource (partially or fully overlaps), that is, when the reserved resource is reused, for some candidate resources, the associated PSFCH will overlap with the PSFCH associated with the reserved resource, as shown in Figure 5 As shown; for some candidate resources, the PSFCH associated with the reserved resource will not overlap with the PSFCH associated with the reserved resource, as shown in Figure 6.

In some embodiments, the terminal device assumes (or determines, defaults) that each reserved resource is associated with a PSFCH, or uses a reservation signal to indicate that the reserved resource is associated with a PSFCH. That is, for each candidate resource, the sensing device can determine whether the PSFCH associated with the candidate resource will overlap with the PSFCH of other devices. This application does not limit the specific manner in which the sensing device determines and distinguishes whether the PSFCH associated with the candidate resource will overlap with the PSFCH of other devices.

For example, in the case of candidate resources reusing reserved resources, the reservation signal may indicate whether HARQ-ACK is enabled, and the sensing device may learn whether the reserved resource is associated with the PSFCH based on the reserved signal. When the reserved resource is associated with the PSFCH, the sensing device can determine whether the PSFCH associated with the candidate resource overlaps the PSFCH of the reserved resource according to the established mapping relationship between PSFCH and PSCCH/PSSCH, as shown in Figures 5 and 6; When the reserved resource is not associated with the PSFCH, the PSFCH associated with the candidate resource will not overlap with the PSFCH of other devices.

For another example, in the case of candidate resources reusing reserved resources, the reservation signal does not indicate whether HARQ-ACK is enabled. At this time, the sensing device can make a conservative assumption, that is, assuming that each reserved resource is associated with a PSFCH; the sensing device Furthermore, according to the predetermined mapping relationship between PSFCH and PSCCH/PSSCH, it is determined whether the PSFCH associated with the candidate resource overlaps with the PSFCH of the reserved resource, as shown in Figures 5 and 6. When the candidate resource does not overlap the reserved resource, it means that the resource is not reserved by any device. Therefore, the PSFCH associated with the candidate resource does not overlap with the PSFCH of other devices. When the sensing device does not detect that any resource reserved by the reserved signal overlaps the candidate resource, it is considered that the candidate resource does not overlap the reserved resource.

In some embodiments, the candidate resource includes at least one of the following: the first candidate resource where the associated PSFCH and the PSFCH associated with the reserved resource do not overlap; the associated PSFCH and the PSFCH associated with the reserved resource overlap The second candidate resource.

In some embodiments, determining whether to exclude the candidate resource or reduce the priority of the candidate resource according to the comparison result includes: the signal measurement result of the reserved resource is higher than the first signal threshold and/or the distance measurement result of the reserved resource is less than In the case of the first distance threshold, the first candidate resource is excluded or the priority of the first candidate resource is reduced, and/or the signal measurement result of the reserved resource is higher than the second signal threshold and/or the distance of the reserved resource When the measurement result is less than the second distance threshold, the second candidate resource is excluded or the priority of the second candidate resource is reduced.

For example, for a device that needs to receive PSFCH, it distinguishes two types of candidate resources that can be used to transmit PSCCH/PSSCH when sensing: For the first type of candidate resource (the first candidate resource), it overlaps with the reserved resource, and The associated PSFCH does not overlap with the PSFCH associated with the reserved resource; for the second type of candidate resource (the second candidate resource), it overlaps with the reserved resource, and the associated PSFCH and the PSFCH associated with the reserved resource Overlapped.

For type 1 candidate resources, when the RSRP at the resource is higher than a certain threshold th_s1 (RSRP>th_s1) and/or the distance d from the resource reserved device is less than a certain threshold th_d1 (d<th_d1), The foregoing type 1 candidate resources are excluded, that is, the sensing device will not use the type 1 candidate resources that meet the foregoing conditions to transmit PSCCH/PSSCH.

For the second type of candidate resource, when the RSRP at the resource is higher than a certain threshold th_s2 (RSRP>th_s2) and/or the distance d from the resource reserved device is less than a certain threshold th_d2 (d<th_d2), The above-mentioned type 2 candidate resources are excluded, that is, the sensing device will not use the type 2 candidate resources that meet the above conditions to transmit the PSCCH/PSSCH.

In some embodiments, the second signal threshold is less than the first signal threshold, and/or the second distance threshold is greater than the first distance threshold.

For example, here two sets of independent thresholds (th_s1, th_d1) and (th_s2, th_d2) are used for type 1 and type 2 candidate resources respectively, and th_s2<th_s1, th_d2>th_d1. This is because type 1 candidate resources only need to avoid PSCCH/PSSCH collision interference, and type 2 candidate resources not only need to avoid PSCCH/PSSCH collision interference, but also need to avoid PSFCH collision interference, that is, the requirements for avoiding interference are more stringent. Therefore, the RSRP threshold th_s2 of the second type of candidate resources is set to be lower than the RSRP threshold th_s1 of the first type of candidate resources, that is, only the second type of candidate resources with lower interference levels have the opportunity to be used for side link transmission. In the same way, the distance threshold th_d2 of the type 2 candidate resource is set to be greater than the distance threshold th_d1 of the type 1 candidate resource, that is, the type 2 candidate resource that is farther from the interference source has the chance to be used for the side link transmission.

For another example, a threshold th_s1 or th_d1 may be associated with the QoS parameters of the PSSCH to be sent by the sensing device and/or the QoS parameters of the PSSCH scheduled by the SCI received by the sensing device. For example, the QoS parameters may include priority, reliability, and delay. For each or each group of QoS parameters, there can be multiple sets of thresholds, and th_s2<th_s1 or th_d2>th_d1 is established.

FIG. 7 is an example diagram of side link communication and candidate resources according to an embodiment of the present application. From the perspective of the sensing device 1_0, taking distance as an example, the necessity of using multiple sets of thresholds is schematically illustrated. The left part of Figure 7 shows the category 1 candidate resources, and the distance d>th_d1, the distance is greater than the threshold means that the interference caused by device 3_0 to device 1_0 is within the acceptable range, so device 1_0 does not exclude the use of the above category 1 candidate resources .

The middle part of Figure 7 shows the second type of candidate resources, and th_d1<d<th_d2, although the distance between the device 3_1 and the device 1_1 is greater than the threshold th_d1, because the device 4_1 is close to the device 1_1, the PSFCH sent by it will affect the device 1_1 The reception of PSFCH causes greater interference, so the threshold th_d1 is not suitable for judging the availability of the second type of candidate resources, that is, a single threshold cannot be applied to both the first and second types of candidate resources.

In order to further avoid PSFCH collision interference, a larger distance threshold th_d2 is used for type 2 resources. The right part of Figure 7 illustrates this situation. The second type of candidate resource satisfies d>th_d2, so that the interference source device 3_2 of PSCCH/PSSCH and the interference source device 4_2 of PSFCH are far away from the device 1_2 and the device 2_2, thus The interference to PSCCH/PSSCH can be avoided, and the interference to PSFCH can be avoided. On the contrary, for the second type candidate resource with d≤th_d2, because the PSFCH will be excessively interfered, the device 1_2 will exclude the use of the second type candidate resource.

In some embodiments, when the number of candidate resources remaining in the first set is less than the threshold, the first signal threshold and/or the second signal threshold are increased, and/or the first distance threshold is decreased and/or A second distance threshold; and comparing the updated resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, and determining whether to exclude the candidate resource or whether to reduce the priority of the candidate resource according to the comparison result.

For example, after the device eliminates some candidate resources through perception, it must ensure that the number of remaining candidate resources is greater than or equal to a threshold M, for example, M=x%×M_total, where M_total represents the number of all candidate resources, and the threshold M is Percent x of the total number of candidate resources, for example x=20; the embodiment of the present application does not limit how to determine the threshold M. When the number of remaining candidate resources is less than the threshold M, the device can lower the selection threshold by increasing the RSRP thresholds th_s1, th_s2, and/or reducing the distance thresholds th_d1, th_d2, thereby reducing the number of excluded candidate resources, so that the remaining The number of candidate resources is higher than the threshold M.

Table 1 shows an example of the resource selection method in the embodiment of the present application.

Table 1

In the above operation 15, x1, x2 represent the adjustment step size of the RSRP, y1, y2 represent the adjustment step size of the distance, and the values of x1, x2, y1, and y2 are non-negative values. This application does not limit the specific values and units of x1, x2, y1, y2, and does not limit the size relationship between x1 and x2, and the size relationship between y1 and y2, for example, x1=x2, y1 =y2.

It should be noted that before comparing the number of remaining candidate resources with the threshold value in operation 14, a number of candidate resources are excluded from the set SA, and operations 12 and 13 only mention the exclusion of candidate resources related to the current discussion issue (here: Candidate resources of the first and second types), in fact, before the comparison in operation 14, other candidate resources can also be excluded. Since other candidate resources have nothing to do with the current discussion issue, they are omitted here for simplicity. This principle also applies to other similar situations in the invention.

Taking RSRP as an example, assuming that the thresholds th_s1 and th_s2 are in decibels dB, and th_s2 is 3dB smaller than th_s1, let th_s1=th, then th_s2=th_s1–3=th-3, and the step size x1=x2=3dB.

FIG. 8 is an example diagram of candidate resources in an embodiment of the present application, and FIG. 9 is another example diagram of candidate resources in an embodiment of the present application. Figures 8 and 9 take RSRP as an example for illustration, which can be easily extended to the case where physical distance is used as the criterion.

For the convenience of presentation, a category 0 candidate resource can be defined. For category 0 candidate resources, they do not overlap with reserved resources, that is, they are not reserved by any reserved signals, so they are not interfered by other devices. After each operation in Table 1 (operation 11 to operation 13) is performed, the three types of candidate resources in FIG. 8 and FIG. 9 will remain in the set SA. The arrangement of the three types of candidate resources in the set SA in FIGS. 8 and 9 is only for convenience of description, and does not represent the actual situation.

As shown in Figure 8, after the operations in Table 1 are executed once, the number of candidate resources remaining in the set SA has exceeded the threshold M, so the second time will not be executed, and the candidate resources in the current set SA will be used as available Candidate resources.

As shown in Figure 9, after the operations in Table 1 are executed once, the number of remaining candidate resources in the set SA is less than the threshold M, so the thresholds th_s1 and th_s2 are both increased by 3dB, and then continue to be executed a second time. Since the threshold limit is relaxed, after the second execution, the number of candidate resources remaining in the set SA exceeds the threshold M, and the set SA obtained as a result of the second execution is used as the available candidate resource.

In some embodiments, the first signal threshold and the second signal threshold are alternately updated, and/or, the first distance threshold and the second distance threshold are alternately updated. For example, update th_s2 during the first execution, update th_s1 during the second execution, and so on. In the same way, th_d1 and th_d2 can also be updated alternately.

Table 2 is another example of the resource selection method in the embodiment of the present application.

Table 2

Taking RSRP as an example, assuming that the thresholds th_s1 and th_s2 are in decibels dB, and th_s2 is 3dB smaller than th_s1, let th_s1=th, then th_s2=th_s1–3=th-3, and the step size x1=x2=3dB.

FIG. 10 is another example diagram of candidate resources according to an embodiment of the present application, and FIG. 11 is another example diagram of candidate resources according to an embodiment of the present application. Figures 10 and 11 take RSRP as an example for illustration, which can be easily extended to the case where physical distance is used as the criterion. Figure 10 shows an example of meeting the threshold condition through two executions, and Figure 11 shows an example of meeting the threshold condition through three executions.

As shown in FIG. 10, alternate update means, for example, that after the first execution, the number of candidate resources remaining in the set SA is less than the threshold value M. At this time, only th_s2 is increased by 3 dB, and th_s1 remains unchanged. Through this operation, in the second execution, all candidate resources satisfying RSRP>th_s1 are actually excluded from the set SA, regardless of whether the candidate resources are the first type or the second type candidate resources. At this time, it actually falls back to a single threshold, so it is possible to switch between multiple thresholds and a single threshold.

This has the following beneficial effects on system performance: when the system is not congested, there are many candidate resources that meet the conditions, and multiple thresholds can be used to distinguish two types of candidate resources, which can not only avoid PSCCH/PSSCH collision interference, but also have the ability to choose more Good resources avoid PSFCH collision interference; when the system is congested, there are fewer candidate resources that meet the conditions. At this time, you can fall back to using a single threshold and focus only on avoiding PSCCH/PSSCH collision interference. By switching between multiple thresholds and a single threshold, better performance can be obtained than simply using a single threshold.

The realization of switching between multiple thresholds and a single threshold is not limited to the foregoing embodiments. Although the execution operations may be different, the implementation effects shown in FIGS. 10 and 11 can be achieved in the end (the number of executions may be different).

Table 3 is another example of the resource selection method in the embodiment of the present application.

table 3

In some embodiments, when the RSSI is calculated (RSSI is a statistical average value), the signal strength of the physical side link shared channel (PSSCH) that carries at least the channel state information is excluded.

For example, when calculating and acquiring RSSI signal measurement results, LTE V2X performs RSSI statistics for periodic subframes, because LTE V2X is mainly used to support periodic services. NR V2X supports both periodic and aperiodic services. In the device perception window, the periodic services of other devices detected will extend to the moment the device selects resources and cause interference, while the detected aperiodic services of other devices will not Interfere with the moment when future equipment selects resources.

Therefore, when calculating the RSSI, the signal energy contributed by the detectable aperiodic services can be excluded, thereby improving the accuracy of the RSSI estimation. The aperiodic services that need to be excluded include not only the aperiodic PSSCH carrying data information, but also the PSSCH carrying CSI feedback. For example, the device detects CSI requests sent by other devices, so that it can know that there is CSI feedback at a certain time in the future. When the device counts RSSI, it excludes the signal energy contributed by the PSSCH carrying the CSI feedback.

The above embodiments only exemplify the embodiments of the present application, but the present application is not limited to this, and appropriate modifications may also be made on the basis of the above various embodiments. For example, each of the above embodiments may be used alone, or one or more of the above embodiments may be combined.

It can be seen from the above embodiment that when the candidate resource and the reserved resource overlap, the terminal device compares the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, wherein at least two types of candidate resources correspond to different resource selections. Threshold; and determining whether to exclude candidate resources or whether to reduce the priority of candidate resources according to the comparison result. As a result, it is possible to provide good support for the HARQ feature introduced by NR V2X.

Embodiments of the second aspect

The embodiment of the first aspect describes PSFCH collision, the embodiment of this application describes the HARQ retransmission, and the same content as the embodiment of the first aspect will not be repeated. At present, NR V2X has agreed to support the reservation of resources for HARQ-ACK (ACK/NACK feedback)-based retransmission.

FIG. 12 is an example diagram of reserving resources for retransmission according to an embodiment of the present application. For example, as shown in Figure 12, the reserved signal reserves resources for HARQ-ACK-based retransmission. The embodiment of this application does not impose restrictions on how to reserve resources for feedback-based retransmission. For example, the SCI of the initial transmission may be scheduled to indicate the resources reserved for retransmission, and so on.

However, a problem that currently exists is that although resources are reserved for retransmissions, if the previous feedback is ACK, indicating that the data has been received correctly, the reserved resources will not be used to send retransmissions, thus causing resources Waste.

Regarding the foregoing problem, the embodiment of the present application assumes that for a certain reserved resource, the device can identify whether it belongs to the resource reserved for feedback-based retransmission. For example, the sensing device receives the SCI, which indicates that the scheduled PSSCH requires ACK/NACK feedback (that is, the PSFCH is associated), and indicates that retransmission resources are reserved. This application does not limit how the device knows whether a certain reserved resource is reserved for feedback-based retransmission. For ease of presentation, the resources reserved for feedback-based retransmission will be referred to as the first reserved resource for short below.

In some embodiments, the candidate resource includes at least one of the following: a third candidate resource that does not overlap with the reserved resource reserved for feedback-based retransmission; and a third candidate resource that does not overlap with the reserved resource reserved for feedback-based retransmission. Overlapping fourth candidate resource.

For example, the device distinguishes two types of candidate resources that can be used to transmit PSCCH/PSSCH during sensing: For the i1th type of candidate resource (third candidate resource), it does not overlap with the first reserved resource, but is different from the first reserved resource. The reserved resources outside the reserved resources overlap; for the i2th type candidate resource (the fourth candidate resource), it overlaps with the first reserved resource.

In some embodiments, determining whether to exclude the candidate resource or whether to reduce the priority of the candidate resource according to the comparison result includes: when the signal measurement result of the reserved resource is higher than the third signal threshold and/or the reservation When the distance measurement result of the resource is less than the third distance threshold, the third candidate resource is excluded or the priority of the third candidate resource is lowered, and/or the signal measurement result of the reserved resource is higher than In a case where the fourth signal threshold and/or the distance measurement result of the reserved resource is less than the fourth distance threshold, the fourth candidate resource is excluded or the priority of the fourth candidate resource is reduced.

For example, for the i1th type of candidate resource, when the RSRP at the resource is higher than a certain threshold thi_s1 (RSRP>thi_s1) and/or the distance d from the resource reserved device is less than a certain threshold thi_d1 (d<thi_d1) When the above-mentioned candidate resource of type i1 is excluded, that is, the sensing device will not use the candidate resource of type i1 that meets the above condition to send PSCCH/PSSCH.

For example, for the i2th type of candidate resource, when the RSRP at the resource is higher than a certain threshold thi_s2 (RSRP>thi_s2) and/or the distance d from the resource reserved device is less than a certain threshold thi_d2 (d<thi_d2) When the above-mentioned candidate resource of type i2 is excluded, that is, the sensing device will not use the candidate resource of type i2 that meets the above-mentioned condition to send PSCCH/PSSCH.

In some embodiments, the fourth signal threshold is greater than the third signal threshold, and/or the fourth distance threshold is less than the third distance threshold.

For example, here two sets of independent thresholds (thi_s1, thi_d1) and (thi_s2, thi_d2) are used for the i1 and i2 candidate resources respectively, and thi_s2>thi_s1, thi_d2<thi_d1. This is because when the ACK is fed back, the first reserved resource will not actually be used for retransmission. Therefore, although the estimated RSRP on the i2th candidate resource is large (that is, the estimated interference exceeds the tolerable limit), the device Can still use the i2 type candidate resource without being interfered by retransmission. And in the actual system, there is a high probability (for example, 90% is a relatively common design goal) that the ACK will be fed back, so the device has a high probability that the i2-th candidate resource can be used without interference.

Setting a higher RSRP threshold for the i2 type candidate resource than the i1 type candidate resource is equivalent to relaxing the restriction on the use of the i2 type candidate resource. Therefore, it will increase the probability of the device using the i2 type resource, thereby avoiding Waste of i2 resources. The above description takes RSRP as an example, and the same principle can be extended to the case of using distance as the measurement result, and will not be repeated. Different implementation manners may be used for the device's perception of the above-mentioned type i1 and type i2 candidate resources.

In some embodiments, when the number of candidate resources remaining in the first set is less than the threshold, the third signal threshold and/or the fourth signal threshold are increased, and/or the third distance threshold and/or A fourth distance threshold; and comparing the updated resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, and determining whether to exclude the candidate resource or whether to reduce the priority of the candidate resource according to the comparison result level.

Table 4 shows an example of the resource selection method in the embodiment of the present application.

Table 4

In the above operation 45, j1 and j2 represent the adjustment step size of RSRP, and k1 and k2 represent the adjustment step size of the distance. Taking RSRP as an example, assuming that the threshold thi_s2 is 3dB larger than thi_s1, let thi_s1=thi, then thi_s2=thi_s1+3=thi+3, and the step size j1=j2=3dB.

FIG. 13 is an example diagram of a candidate resource in an embodiment of the present application, and FIG. 14 is another example diagram of a candidate resource in an embodiment of the present application. Figures 13 and 14 take RSRP as an example for illustration, which can be easily extended to the case where physical distance is used as the criterion.

In addition, the i0th category candidate resources can be defined. For the i0-th candidate resource, it does not overlap with any reserved resources. The arrangement of the three types of candidate resources in the set SA in Figures 13 and 14 is only for convenience of description, and does not represent the actual situation.

As shown in Figure 13, after the operations in Table 4 are performed once (operations 41 to 43), the number of candidate resources remaining in the set SA has exceeded the threshold M, so the second time will not be performed, and the current set SA As the available candidate resources.

As shown in FIG. 14, after the operations in Table 4 are executed once, the number of candidate resources remaining in the set SA is less than the threshold M, so the thresholds thi_s1 and thi_s2 are both increased by 3dB, and then continue to be executed a second time. Since the threshold limit is relaxed, after the second execution, the number of candidate resources remaining in the set SA exceeds the threshold M, and the set SA obtained as a result of the second execution is used as the available candidate resource.

In some embodiments, the third signal threshold and the fourth signal threshold are alternately updated, and/or, the third distance threshold and the fourth distance threshold are alternately updated. For example, update thi_s2 during the first execution, update thi_s1 during the second execution, and so on. In the same way, thi_d1 and thi_d2 can also be updated alternately.

Table 5 is another example of the resource selection method in the embodiment of the present application.

table 5

Taking RSRP as an example, assuming that the threshold thi_s2 is equal to thi_s1, let thi_s1=thi, then thi_s2=thi_s1=thi, and the step size j1=j2=3dB.

FIG. 15 is an example diagram of candidate resources in an embodiment of the present application, and FIG. 16 is another example diagram of candidate resources in an embodiment of the present application. Figures 15 and 16 take RSRP as an example for illustration, which can be easily extended to the case where physical distance is used as the criterion.

As shown in Figure 15, in the first execution, all candidate resources satisfying RSRP>thi_s1 are actually excluded from the set SA, regardless of whether the candidate resources are the i1 or i2 candidate resources. At this point, it actually falls back to a single threshold. After the first execution, the number of remaining candidate resources in the set SA is less than the threshold value M. At this time, only thi_s2 is increased by 3 dB, and th_s1 remains unchanged, which actually changes to a multi-threshold situation. Since there is a high probability that the i2th type candidate resource will not be used for retransmission, when the resource is insufficient, first consider using the i2th type candidate resource by relaxing the restriction conditions, which can avoid interference and improve resource utilization. The above operation can switch between multiple thresholds and a single threshold.

Figure 16 shows an example of meeting the threshold condition through three executions. The realization of switching between multiple thresholds and a single threshold is not limited to the above one embodiment. Although the execution steps may be different, the implementation effects shown in Figure 15 and Figure 16 can be achieved in the end (the number of executions may be different). The implementation modes and their variants are not listed in this application.

The above embodiments only exemplify the embodiments of the present application, but the present application is not limited to this, and appropriate modifications may also be made on the basis of the above various embodiments. For example, each of the above embodiments may be used alone, or one or more of the above embodiments may be combined.

It can be seen from the above embodiment that when the candidate resource and the reserved resource overlap, the terminal device compares the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, wherein at least two types of candidate resources correspond to different resource selections. Threshold; and determining whether to exclude candidate resources or whether to reduce the priority of candidate resources according to the comparison result. As a result, it is possible to provide good support for the HARQ feature introduced by NR V2X.

Embodiments of the third aspect

The embodiments of the present application are further described on the basis of the embodiments of the first aspect and the second aspect, and the same content as the embodiments of the first aspect and the second aspect will not be repeated.

In some embodiments, the candidate resource includes at least one of the following:

The associated PSFCH does not overlap with the PSFCH associated with the reserved resource, and does not overlap the fifth candidate resource with the reserved resource reserved for feedback-based retransmission;

The associated PSFCH overlaps with the PSFCH associated with the reserved resource, and is a sixth candidate resource that does not overlap with the reserved resource reserved for feedback-based retransmission;

The associated PSFCH does not overlap with the PSFCH associated with the reserved resource, and overlaps the seventh candidate resource with the reserved resource reserved for feedback-based retransmission;

The associated PSFCH overlaps with the PSFCH associated with the reserved resource, and overlaps the eighth candidate resource with the reserved resource reserved for feedback-based retransmission.

For example, for a device that enables the embodiment of the first aspect and the embodiment of the second aspect at the same time, the device may record a candidate resource that does not overlap with any reserved resource as the c0-th candidate resource; Candidate resources with overlapping resources can be divided into the following four types of candidate resources, c1, c2, c3, and c4, corresponding to the fifth, sixth, seventh, and eighth candidate resources respectively.

Table 6

In some embodiments, determining whether to exclude the candidate resource or whether to reduce the priority of the candidate resource according to the comparison result includes at least one or any combination of the following:

In the case where the signal measurement result of the reserved resource is higher than the fifth signal threshold and/or the distance measurement result of the reserved resource is less than the fifth distance threshold, the fifth candidate resource is excluded or the first Five priority of candidate resources;

In the case where the signal measurement result of the reserved resource is higher than the sixth signal threshold and/or the distance measurement result of the reserved resource is smaller than the sixth distance threshold, the sixth candidate resource is excluded or the first Six priority of candidate resources;

In the case where the signal measurement result of the reserved resource is higher than the seventh signal threshold and/or the distance measurement result of the reserved resource is less than the seventh distance threshold, the seventh candidate resource is excluded or the first candidate resource is reduced. 7. Priority of candidate resources;

In the case where the signal measurement result of the reserved resource is higher than the eighth signal threshold and/or the distance measurement result of the reserved resource is less than the eighth distance threshold, the eighth candidate resource is excluded or the first 8. Priority of candidate resources.

Table 7 is another example of the resource selection method in the embodiment of the present application.

Table 7

The following only takes RSRP as an example for explanation, which is easy to extend to the case of using distance as a criterion.

Since the c2 type candidate resource is actually equivalent to the type 2 candidate resource in the embodiment of the first aspect, for the c2 type candidate resource, thc_s2<thc_s1 can be set to further avoid PSFCH collision; because the c3 type candidate resource In fact, it is equivalent to the i2th type candidate resource in the embodiment of the second aspect, so for the c3th type candidate resource, thc_s3>thc_s1 can be set to further improve the resource utilization; for the c4th type candidate resource, from the perspective of avoiding interference To start, you can set thc_s4<thc_s1 to further avoid PSFCH collisions. From the perspective of maximizing system spectrum efficiency, you can set thc_s4>thc_s1 to further improve resource utilization.

Similar to the embodiments of the first and second aspects, the thresholds thc_s1, thc_s2, thc_s3, and thc_s4 are not necessarily updated at the same time, and the thresholds may be updated alternately. Assuming that initially thc_s1=thc, thc_s2=thc-3, thc_s3=thc_s4=thc, and the RSRP adjustment steps are all 3dB.

FIG. 17 is an example diagram of candidate resources in an embodiment of the present application. As shown in FIG. 17, after the first execution, the number of candidate resources remaining in the SA is less than the threshold M, and the threshold of the c2 type candidate resources is first increased; After the second execution, if the number of candidate resources is still less than the threshold M, the thresholds of the c3 and c4 types of candidate resources are increased; after the third execution, if the number of candidate resources is still less than the threshold M, then the c1 is increased The threshold of class candidate resources; and so on, until the number of candidate resources is greater than or equal to the threshold M. Through this alternate update, it is possible to switch between a single threshold and multiple thresholds. For example, the second execution, the fifth execution, etc. are all with a single threshold.

The above embodiments only exemplify the embodiments of the present application, but the present application is not limited to this, and appropriate modifications may also be made on the basis of the above various embodiments. For example, each of the above embodiments may be used alone, or one or more of the above embodiments may be combined.

It can be seen from the above embodiment that when the candidate resource and the reserved resource overlap, the terminal device compares the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, wherein at least two types of candidate resources correspond to different resource selections. Threshold; and determining whether to exclude candidate resources or whether to reduce the priority of candidate resources according to the comparison result. As a result, it is possible to provide good support for the HARQ feature introduced by NR V2X.

Embodiment of the fourth aspect

The embodiments of the present application are further described on the basis of the embodiments of the first aspect to the third aspect, and the same content as the embodiments of the first aspect to the third aspect will not be repeated.

In some embodiments, whether to enable the function of “using different resource selection thresholds for different candidate resources” is pre-configured or predefined; or, whether to enable “use different resource selection thresholds for different candidate resources” "This function is configured by network equipment or other terminal equipment, for example, through RRC signaling and/or DCI.

For example, whether to enable the sensing methods (methods, solutions) of the embodiments of the first aspect to the third aspect may be mandatory, or configurable or pre-configured or predefined.

For example, different sensing methods can be enabled for devices with different business requirements. For example, devices with high reliability requirements can perform perception and resource selection based on the principle of avoiding interference, that is, resources can be reused only under very low interference conditions, so they can only be enabled to perform the first aspect of the embodiment; and reliable Devices with low performance requirements can perform perception and resource selection based on the principle of maximizing resource utilization, that is, reusing resources as much as possible, so they can only be enabled to execute the embodiments of the second aspect.

For example, different sensing methods can be enabled for devices that support different functions. For example, for a device that does not need to feed back ACK/NACK, since it does not need to consider ACK/NACK collision, it may not be enabled to execute the embodiment of the first aspect, but only be enabled to execute the embodiment of the second aspect; A device that needs to feed back ACK/NACK may be enabled to execute the embodiment of the first aspect and/or the embodiment of the second aspect.

For example, if it is necessary to support avoidance of PSFCH collisions carrying HARQ-ACK, the method in the embodiment of the first aspect may be enabled. Each type of resource (for example, the first resource, the second resource) independently corresponds to the resource selection threshold.

For another example, if the resources reserved for HARQ retransmission need to be reused, the method in the embodiment of the second aspect may be enabled. Each type of resource (for example, the third resource, the fourth resource) independently corresponds to the resource selection threshold.

For another example, if it is necessary to support the avoidance of PSFCH collisions carrying HARQ-ACK, and to reuse resources reserved for HARQ retransmission, the method in the embodiment of the third aspect may be enabled. Each type of resource (for example, the fifth resource to the eighth resource) independently corresponds to the resource selection threshold.

Embodiment of the fifth aspect

The foregoing describes the obtaining of the candidate resource set SA (first set). The embodiments of the present application are further described on the basis of the embodiments of the first aspect to the fourth aspect, and the same content as the embodiments of the first aspect to the fourth aspect will not be repeated.

After the set SA is obtained, a candidate resource that can finally be used for PSCCH/PSSCH transmission needs to be selected from the set SA. It is possible to generate a candidate resource set SB (second set) and select a candidate resource in the set SB for actual transmission.

In some embodiments, candidate resources are moved from the first set to the second set; wherein, at least two types of candidate resources in the first set are moved into the second set with different priorities.

For example, a metric is calculated for each candidate resource in the set SA, and the metric may be any signal measurement result described in the embodiment of the first aspect, such as RSSI. Put the candidate resource with the smallest metric in the set SA into the set SB, and repeat this step until the number of candidate resources in the set SB is greater than or equal to a certain threshold M1. For example, M1=x1%×M_total, where M_total represents the number of all candidate resources, and the threshold value M1 is x1 percent of the total number of candidate resources, for example, x1=20. This application does not limit how to determine the threshold value M1.

For another example, move the candidate resources in the set SA into the set SB according to their types, that is, move the candidate resources of a certain type into the SB, and then move the candidate resources of another type into the SB, until the number of candidate resources in the set SB is greater than or equal to a certain A threshold value M1.

Taking the embodiment of the first aspect as an example, as shown in Figure 8, the set SA includes category 0, category 1, and category 2 candidate resources; first move the category 0 candidate resources into the set SB, if the number of candidate resources is less than the gate If the number of candidate resources is less than the threshold M1, then the candidate resources of the second type are moved into the set SB if the number of candidate resources is less than the threshold M1. It can be moved in in ascending order of type number, or in other order, which is not limited in this application. The same principle can be applied to different types of candidate resources in the collection SA in the embodiment of the second aspect and the embodiment of the third aspect.

In some embodiments, the candidate resources are moved from the first set to the second set, and resources for side link transmission are selected from the second set; wherein, at least two types of candidate resources in the second set have Different selection probabilities.

For example, the device may select a candidate resource in the candidate resource set SB (when no SB is generated, use the set SA) for actual side link transmission. The generation of the candidate resource set SB is optional. When the set SB is not generated, the device selects a candidate resource in the set SA for actual transmission.

For example, the device randomly selects a candidate resource from the candidate resource set; for another example, the device applies different selection probabilities for different types of candidate resources. Taking the embodiment of the first aspect as an example, for example, the probability of selecting the category 0 candidate resource by the device is greater than the probability of selecting the category 1 candidate resource, and the probability of selecting the category 1 candidate resource is greater than the probability of selecting the category 2 candidate resource, namely The device has a greater probability to select candidate resources with less interference, and the device also has a certain probability to select other candidate resources, so as to avoid too many devices to select candidate resources with less interference and cause congestion. For another example, it is possible to set successively decreasing selection probabilities for the type number in the descending order of the type number, or in other order, which is not limited in this application. The same principle can be applied to different types of candidate resources in the collection SA in the embodiment of the second aspect and the embodiment of the third aspect.

The above embodiments only exemplify the embodiments of the present application, but the present application is not limited to this, and appropriate modifications may also be made on the basis of the above various embodiments. For example, each of the above embodiments may be used alone, or one or more of the above embodiments may be combined.

It can be seen from the above embodiment that when the candidate resource and the reserved resource overlap, the terminal device compares the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, wherein at least two types of candidate resources correspond to different resource selections. Threshold; and determining whether to exclude candidate resources or whether to reduce the priority of candidate resources according to the comparison result. As a result, it is possible to provide good support for the HARQ feature introduced by NR V2X.

Embodiments of the sixth aspect

The embodiments of the present application may be combined with the embodiments of the first aspect to the fifth aspect, or may be implemented separately, and the same content as the embodiments of the first aspect to the fifth aspect will not be repeated.

As described in the previous embodiment, when the device performs sensing, it will exclude candidate resources that do not meet the threshold condition. In addition, the device will exclude some other candidate resources, including at least resources that may be used for time slot aggregation. Time slot aggregation uses more than one time-consecutive time slot for transmission. Because more resources are used, it can carry a larger data load and ensure reliability. The device also performs side link transmission in the sensing window.

FIG. 18 is a schematic diagram of the sensing window and resource selection window of the embodiment of the present application. For example, as shown in FIG. 18, device 1 uses one time slot to transmit PSCCH/PSSCH in the sensing window. Due to the limitation of half-duplex, device 1 transmits Reception cannot be performed in the slot, so the transmission of other devices in the slot cannot be sensed.

Assuming that in the time slot sent by device 1, there is device 2 sending, and device 2 uses time slot aggregation, then the resources occupied by device 2 will extend to the resource selection window of device 1. Since device 1 fails to detect the transmission of device 2 through perception, device 1 cannot avoid the resources occupied by device 2's time slot aggregation when selecting resources in the resource selection window, so it may collide and interfere with device 2. In the same way, other devices may also send in the time slot of device 1, such as device 3 and device 4 in Figure 18. The resources occupied by the time slot aggregation are all extended to the resource selection window of device 1, so Will exacerbate the impact on the resource selection of device 1.

To solve this problem, the device can exclude the time slots used by time slot aggregation that extend into the resource selection window of its own. The device can assume that there are other devices in its own transmission time slot for transmission in a time slot aggregation mode, and assume that the time slot is the first time slot in the time slot aggregation.

In some embodiments, the terminal device determines a candidate resource corresponding to a resource that is included in the sensing window but is not sensed, wherein the candidate resource includes at least two time slots consecutive in time; and excludes the candidate resource Or reduce the priority of the candidate resource.

For example, when multiple timeslot aggregation lengths are supported (for example, K timeslot aggregation and L timeslot aggregation are supported, and K<L), it is assumed that the maximum timeslot aggregation length (L) is used. The device assumes that from its own transmission time slot, there are L time slots occupied by time slot aggregation. If there are L0 time slots in the L time slots extending into the resource selection window of the device, the device will use these L0 time slots Candidate resources within are excluded, that is, the device will not select and use resources within these L0 time slots for side link transmission.

For ease of presentation, the above operation is simply referred to as excluding time slot aggregation. And the resource pool is defined as a series of time and frequency resources for side link transmission and/or reception, as shown in Figure 18. Considering that excluding time slot aggregation, several consecutive time slots in the resource selection window cannot be used, which leads to resource waste to a certain extent.

In some embodiments, the time slot aggregation function can be enabled in the unit of resource pool. In the resource pool where time slot aggregation is enabled, the device can perform the operation to exclude time slot aggregation. In the resource pool where time slot aggregation is not enabled, The device does not perform the operation to exclude time slot aggregation. Configuring time slot aggregation per resource pool provides greater flexibility. Time slot aggregation can be concentrated in a part of the resource pool, thereby reducing the waste of resources caused by the sensing device avoiding continuous resources.

In some embodiments, when a resource pool is configured or pre-configured to support one or more timeslot numbers of at least two timeslots continuous in time, the number of timeslots contained in the candidate resource is one or The largest number of time slots in the number of multiple time slots.

For example, a resource pool with time slot aggregation enabled can be configured or pre-configured with multiple time slot aggregation lengths. In addition, the above-mentioned excluded time slot aggregation function can be enabled only for a certain device or certain service. For example, for devices that need to meet high reliability requirements, the excluded timeslot aggregation function can be enabled, so that potential interference can be avoided to the greatest extent and the reliability of side link transmission can be guaranteed.

The above embodiments only exemplify the embodiments of the present application, but the present application is not limited to this, and appropriate modifications may also be made on the basis of the above various embodiments. For example, each of the above embodiments may be used alone, or one or more of the above embodiments may be combined.

It can be seen from the above-mentioned embodiments that the terminal device is configured or pre-configured with one or more resource pools for side link transmission; among them, one resource pool is configured or pre-configured to be able to use at least two consecutive time slots. The slots perform side link transmission, and/or are configured or pre-configured to support one or more number of time slots of at least two time slots that are continuous in time. As a result, it is possible to provide good support for the HARQ feature introduced by NR V2X.

Embodiments of the seventh aspect

The embodiment of the present application provides a resource selection device. The apparatus may be, for example, a terminal device, or may be some or some parts or components configured in the terminal device, and the same content as the embodiments of the first aspect to the sixth aspect will not be repeated.

FIG. 19 is a schematic diagram of a resource selection device according to an embodiment of the present application. As shown in FIG. 19, the resource selection device 1900 includes:

A comparing unit 1901, which compares the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource when the candidate resource and the reserved resource overlap, wherein at least two types of candidate resources correspond to different resource selection thresholds; and

The determining unit 1902 determines whether to exclude the candidate resource or whether to reduce the priority of the candidate resource according to the comparison result.

In some embodiments, the measurement result of the reserved resource includes a signal measurement result between the terminal device and other terminal devices that reserve the reserved resource, and the resource selection threshold includes a signal threshold of the signal measurement result.

In some embodiments, the measurement result of the reserved resource includes the distance measurement result between the terminal device and other terminal devices that reserve the reserved resource, and the resource selection threshold includes the distance threshold of the distance measurement result.

In some embodiments, the signal measurement result includes at least one of the following: reference signal received power, received signal strength indicator, reference signal received quality, signal-to-noise ratio, and signal-to-interference and noise ratio.

In some embodiments, when calculating the received signal strength indicator, the signal strength of the physical side link shared channel that carries at least the channel state information is excluded.

In some embodiments, the candidate resource includes at least one of the following:

The first candidate resource in which the associated physical side link feedback channel and the physical side link feedback channel associated with the reserved resource do not overlap;

The second candidate resource where the associated physical side link feedback channel overlaps with the physical side link feedback channel associated with the reserved resource.

In some embodiments, the determining unit 1902 is used to:

When the signal measurement result of the reserved resource is higher than the first signal threshold and/or the distance measurement result of the reserved resource is smaller than the first distance threshold, the first candidate resource is excluded or the first candidate resource is reduced. The priority of a candidate resource; and/or

In the case where the signal measurement result of the reserved resource is higher than the second signal threshold and/or the distance measurement result of the reserved resource is smaller than the second distance threshold, the second candidate resource is excluded or the first candidate resource is reduced. 2. Priority of candidate resources.

In some embodiments, the second signal threshold is less than the first signal threshold, and/or the second distance threshold is greater than the first distance threshold.

In some embodiments, the resource selection device 1900 further includes:

The adjusting unit 1903, which increases the first signal threshold and/or the second signal threshold, and/or reduces the first distance threshold and/or the first distance threshold when the number of candidate resources remaining in the first set is less than the threshold Two distance threshold;

In addition, the comparing unit 1901 compares the updated resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, and the determining unit 1902 determines whether to exclude the candidate resource or reduce the priority of the candidate resource according to the comparison result.

In some embodiments, the first signal threshold and the second signal threshold are alternately updated, and/or, the first distance threshold and the second distance threshold are alternately updated.

In some embodiments, the terminal device assumes that each reserved resource is associated with a physical side link feedback channel, or indicates that the reserved resource is associated with a physical side link feedback channel through a reservation signal.

In some implementations, the candidate resources include at least one of the following: a third candidate resource that does not overlap with the reserved resources reserved for feedback-based retransmission; and overlaps with the reserved resources reserved for feedback-based retransmission. The fourth candidate resource.

In some embodiments, the determining unit 1902 is used to:

In the case where the signal measurement result of the reserved resource is higher than the third signal threshold and/or the distance measurement result of the reserved resource is smaller than the third distance threshold, the third candidate resource is excluded or the first Priority of three candidate resources; and/or

In the case where the signal measurement result of the reserved resource is higher than the fourth signal threshold and/or the distance measurement result of the reserved resource is less than the fourth distance threshold, the fourth candidate resource is excluded or the first Four priority of candidate resources.

In some embodiments, the fourth signal threshold is greater than the third signal threshold, and/or the fourth distance threshold is less than the third distance threshold.

In some embodiments, the adjustment unit 1903 increases the third signal threshold and/or the fourth signal threshold, and/or reduces the third distance threshold when the number of candidate resources remaining in the first set is less than the threshold. And/or the fourth distance threshold;

In addition, the comparing unit 1901 compares the updated resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, and the determining unit 1902 determines whether to exclude the candidate resource or reduce the priority of the candidate resource according to the comparison result.

In some embodiments, the third signal threshold and the fourth signal threshold are alternately updated, and/or, the third distance threshold and the fourth distance threshold are alternately updated.

In some embodiments, the reservation signal indicates the reserved resources for the resources reserved for feedback-based retransmission.

In some embodiments, the candidate resource includes at least one of the following:

The associated physical side link feedback channel does not overlap with the physical side link feedback channel associated with the reserved resource, and does not overlap with the fifth reserved resource reserved for feedback-based retransmission. Candidate resources;

The associated physical side link feedback channel overlaps the physical side link feedback channel associated with the reserved resource, and does not overlap the sixth candidate with the reserved resource reserved for feedback-based retransmission Resources;

The seventh candidate whose associated physical side link feedback channel does not overlap with the physical side link feedback channel associated with the reserved resource, and overlaps with the reserved resource reserved for feedback-based retransmission Resources;

The eighth candidate resource whose associated physical side link feedback channel overlaps with the physical side link feedback channel associated with the reserved resource, and overlaps with the reserved resource reserved for feedback-based retransmission .

In some embodiments, the determining unit 1902 performs at least one or any combination of the following operations:

In the case where the signal measurement result of the reserved resource is higher than the fifth signal threshold and/or the distance measurement result of the reserved resource is less than the fifth distance threshold, the fifth candidate resource is excluded or the first Five priority of candidate resources;

In the case where the signal measurement result of the reserved resource is higher than the sixth signal threshold and/or the distance measurement result of the reserved resource is smaller than the sixth distance threshold, the sixth candidate resource is excluded or the first Six priority of candidate resources;

In the case where the signal measurement result of the reserved resource is higher than the seventh signal threshold and/or the distance measurement result of the reserved resource is less than the seventh distance threshold, the seventh candidate resource is excluded or the first candidate resource is reduced. 7. Priority of candidate resources;

In the case where the signal measurement result of the reserved resource is higher than the eighth signal threshold and/or the distance measurement result of the reserved resource is less than the eighth distance threshold, the eighth candidate resource is excluded or the first 8. Priority of candidate resources.

In some embodiments, the resource selection device 1900 further includes:

A move-in unit 1904, which moves the candidate resource from the first set into the second set; wherein at least two types of candidate resources in the first set are moved into the second set with different priorities; or

Move the candidate resources from the first set to the second set, and select resources for side link transmission from the second set; wherein at least two types of candidate resources in the second set have different selection probabilities .

In some embodiments, the determining unit 1902 is further configured to: determine a candidate resource corresponding to a resource included in the sensing window but not being sensed, wherein the candidate resource includes at least two consecutive time slots in time; and Excluding the candidate resource or lowering the priority of the candidate resource.

In some embodiments, when a resource pool is configured or pre-configured to support one or more timeslot numbers of at least two timeslots continuous in time, the number of timeslots contained in the candidate resource is one or The largest number of time slots in the number of multiple time slots.

The above embodiments only exemplify the embodiments of the present application, but the present application is not limited to this, and appropriate modifications may also be made on the basis of the above various embodiments. For example, each of the above embodiments may be used alone, or one or more of the above embodiments may be combined.

It is worth noting that the above only describes the components or modules related to the application, but the application is not limited thereto. The resource selection device 1900 may also include other components or modules. For the specific content of these components or modules, reference may be made to related technologies.

In addition, for the sake of simplicity, FIG. 19 only exemplarily shows the connection relationship or signal direction between various components or modules, but it should be clear to those skilled in the art that various related technologies such as bus connection can be used. The foregoing components or modules may be implemented by hardware facilities such as a processor, a memory, a transmitter, and a receiver; the implementation of this application does not limit this.

It can be seen from the above embodiment that when the candidate resource and the reserved resource overlap, the terminal device compares the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, wherein at least two types of candidate resources correspond to different resource selections. Threshold; and determining whether to exclude candidate resources or whether to reduce the priority of candidate resources according to the comparison result. As a result, it is possible to provide good support for the HARQ feature introduced by NR V2X.

Embodiment of the eighth aspect

An embodiment of the present application also provides a communication system, which may refer to FIG. 1, and the same content as the embodiments of the first aspect to the seventh aspect will not be repeated.

In some embodiments, the communication system 100 may at least include:

The terminal device 102 compares the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource when the candidate resource and the reserved resource overlap, wherein at least two types of candidate resources correspond to different resources Selecting a threshold; and determining whether to exclude the candidate resource or whether to reduce the priority of the candidate resource according to the comparison result.

The embodiment of the present application also provides a network device, which may be a base station, for example, but the present application is not limited to this, and may also be other network devices.

FIG. 20 is a schematic diagram of the structure of a network device according to an embodiment of the present application. As shown in FIG. 20, the network device 2000 may include: a processor 2010 (for example, a central processing unit CPU) and a memory 2020; the memory 2020 is coupled to the processor 2010. The memory 2020 can store various data; in addition, it also stores an information processing program 2030, and the program 2030 is executed under the control of the processor 2010.

In addition, as shown in FIG. 20, the network device 2000 may further include: a transceiver 2040, an antenna 2050, etc.; wherein the functions of the above-mentioned components are similar to those of the prior art, and will not be repeated here. It is worth noting that the network device 2000 does not necessarily include all the components shown in FIG. 20; in addition, the network device 2000 may also include components not shown in FIG. 20, and the prior art can be referred to.

The embodiment of the present application also provides a terminal device, but the present application is not limited to this, and may also be other devices.

FIG. 21 is a schematic diagram of a terminal device according to an embodiment of the present application. As shown in FIG. 21, the terminal device 2100 may include a processor 2110 and a memory 2120; the memory 2120 stores data and programs, and is coupled to the processor 2110. It is worth noting that this figure is exemplary; other types of structures can also be used to supplement or replace this structure to achieve telecommunication functions or other functions.

For example, the processor 2110 may be configured to execute a program to implement the resource selection method as described in the embodiments of the first to fifth aspects. For example, the processor 2110 may be configured to perform the following control: in the case where the candidate resource and the reserved resource overlap, compare the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, where at least The two types of candidate resources correspond to different resource selection thresholds; and according to the comparison result, it is determined whether to exclude the candidate resource or whether to reduce the priority of the candidate resource.

As shown in FIG. 21, the terminal device 2100 may further include: a communication module 2130, an input unit 2140, a display 2150, and a power supply 2160. Among them, the functions of the above-mentioned components are similar to those of the prior art, and will not be repeated here. It is worth noting that the terminal device 2100 does not necessarily include all the components shown in FIG. 21, and the above-mentioned components are not necessary; in addition, the terminal device 2100 may also include components not shown in FIG. 21. There is technology.

An embodiment of the present application further provides a computer program, wherein when the program is executed in a terminal device, the program causes the terminal device to execute the resource selection method described in the embodiments of the first aspect to the sixth aspect.

An embodiment of the present application also provides a storage medium storing a computer program, wherein the computer program enables a terminal device to execute the resource selection method described in the embodiments of the first aspect to the sixth aspect.

The above devices and methods of this application can be implemented by hardware, or by hardware combined with software. This application relates to such a computer-readable program, when the program is executed by a logic component, the logic component can realize the above-mentioned device or constituent component, or the logic component can realize the above-mentioned various methods Or steps. This application also relates to storage media for storing the above programs, such as hard disks, magnetic disks, optical disks, DVDs, flash memory, etc.

The method/device described in conjunction with the embodiments of the present application may be directly embodied as hardware, a software module executed by a processor, or a combination of the two. For example, one or more of the functional block diagrams and/or one or more combinations of the functional block diagrams shown in the figure may correspond to each software module of the computer program flow or each hardware module. These software modules can respectively correspond to the steps shown in the figure. These hardware modules can be implemented by curing these software modules by using a field programmable gate array (FPGA), for example.

The software module can be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM or any other form of storage medium known in the art. A storage medium may be coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be a component of the processor. The processor and the storage medium may be located in the ASIC. The software module can be stored in the memory of the mobile terminal, or can be stored in a memory card that can be inserted into the mobile terminal. For example, if the device (such as a mobile terminal) uses a larger-capacity MEGA-SIM card or a large-capacity flash memory device, the software module can be stored in the MEGA-SIM card or a large-capacity flash memory device.

One or more of the functional blocks described in the drawings and/or one or more combinations of the functional blocks can be implemented as general-purpose processors, digital signal processors (DSPs) for performing the functions described in this application. ), Application Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component or any appropriate combination thereof. One or more of the functional blocks described in the drawings and/or one or more combinations of the functional blocks can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, or multiple micro-processing Processor, one or more microprocessors in communication with the DSP, or any other such configuration.

The application is described above in conjunction with specific implementations, but it should be clear to those skilled in the art that these descriptions are all exemplary and do not limit the scope of protection of the application. Those skilled in the art can make various variations and modifications to the application according to the spirit and principle of the application, and these variations and modifications are also within the scope of the application.

Regarding the implementation including the above examples, the following supplementary notes are also disclosed:

Supplement 1. A method of resource selection, including:

When the candidate resource and the reserved resource overlap, the terminal device compares the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, wherein at least two types of candidate resources correspond to different resource selection thresholds; as well as

According to the comparison result, it is determined whether to exclude the candidate resource or whether to reduce the priority of the candidate resource.

Appendix 2. The method according to Appendix 1, wherein the measurement result of the reserved resource includes a signal measurement result between the terminal device and other terminal devices that reserve the reserved resource, and the resource The selection threshold includes the signal threshold of the signal measurement result.

Appendix 3. The method according to Appendix 2, wherein the signal measurement result includes at least one of the following: reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), Signal to noise ratio (SNR), signal to interference and noise ratio (SINR).

Supplement 4. The method according to Supplement 3, wherein when calculating the RSSI, the signal strength of the physical side link shared channel (PSSCH) carrying at least the channel state information is excluded.

Supplement 5. The method according to any one of Supplements 1 to 4, wherein the measurement result of the reserved resource includes a distance measurement between the terminal device and other terminal devices that reserve the reserved resource As a result, the resource selection threshold includes the distance threshold of the distance measurement result.

Supplement 6. The method according to any one of Supplements 1 to 5, wherein the candidate resource includes at least one of the following: the associated physical side link feedback channel (PSFCH) is associated with the reserved resource The physical side link feedback channel (PSFCH) does not overlap the first candidate resource; the associated physical side link feedback channel (PSFCH) and the physical side link feedback channel (PSFCH) associated with the reserved resource occur Overlapping second candidate resource.

Appendix 7. The method according to Appendix 6, wherein the determining whether to exclude the candidate resource or whether to reduce the priority of the candidate resource according to the comparison result includes:

When the signal measurement result of the reserved resource is higher than the first signal threshold and/or the distance measurement result of the reserved resource is smaller than the first distance threshold, the first candidate resource is excluded or the first candidate resource is reduced. The priority of a candidate resource; and/or

In the case where the signal measurement result of the reserved resource is higher than the second signal threshold and/or the distance measurement result of the reserved resource is smaller than the second distance threshold, the second candidate resource is excluded or the first candidate resource is reduced. 2. Priority of candidate resources.

Appendix 8. The method according to Appendix 7, wherein the second signal threshold is less than the first signal threshold, and/or the second distance threshold is greater than the first distance threshold.

Supplement 9. The method according to Supplement 7, wherein the method further includes:

In the case that the number of remaining candidate resources in the first set is less than the threshold, increase the first signal threshold and/or the second signal threshold, and/or decrease the first distance threshold and/or The second distance threshold; and

The updated resource selection threshold corresponding to the candidate resource is compared with the measurement result of the reserved resource, and it is determined whether to exclude the candidate resource or whether to reduce the priority of the candidate resource according to the comparison result.

Appendix 10. The method according to Appendix 9, wherein the first signal threshold and the second signal threshold are alternately updated, and/or the first distance threshold and the second distance threshold are updated Update alternately.

Appendix 11. The method according to appendix 6, wherein the terminal equipment assumes that each reserved resource is associated with the physical side link feedback channel (PSFCH), or indicates that each reserved resource is The reserved resources are associated with the physical side link feedback channel (PSFCH).

Supplement 12. The method according to any one of Supplements 1 to 5, wherein the candidate resource includes at least one of the following: a first resource that does not overlap with the reserved resource reserved for feedback-based retransmission Three candidate resources; the fourth candidate resource that overlaps with the reserved resources reserved for feedback-based retransmission.

Appendix 13. The method according to Appendix 12, wherein the determining whether to exclude the candidate resource or whether to reduce the priority of the candidate resource according to the comparison result includes:

In the case where the signal measurement result of the reserved resource is higher than the third signal threshold and/or the distance measurement result of the reserved resource is smaller than the third distance threshold, the third candidate resource is excluded or the first Priority of three candidate resources; and/or

In the case where the signal measurement result of the reserved resource is higher than the fourth signal threshold and/or the distance measurement result of the reserved resource is less than the fourth distance threshold, the fourth candidate resource is excluded or the first Four priority of candidate resources.

Appendix 14. The method according to Appendix 13, wherein the fourth signal threshold is greater than the third signal threshold, and/or the fourth distance threshold is less than the third distance threshold.

Appendix 15. The method according to appendix 13, wherein the method further includes:

In the case that the number of remaining candidate resources in the first set is less than the threshold, increase the third signal threshold and/or the fourth signal threshold, and/or decrease the third distance threshold and/or The fourth distance threshold; and

The updated resource selection threshold corresponding to the candidate resource is compared with the measurement result of the reserved resource, and it is determined whether to exclude the candidate resource or whether to reduce the priority of the candidate resource according to the comparison result.

Appendix 16. The method according to Appendix 15, wherein the third signal threshold and the fourth signal threshold are alternately updated, and/or the third distance threshold and the fourth distance threshold are updated Update alternately.

Supplement 17. The method according to Supplement 12, wherein a reservation signal indicates that the reserved resources are resources reserved for feedback-based retransmission.

Supplement 18. The method according to any one of Supplements 1 to 5, wherein the candidate resource includes at least one of the following:

The associated physical side link feedback channel (PSFCH) does not overlap with the physical side link feedback channel (PSFCH) associated with the reserved resource, and is identical to the reserved resource reserved for feedback-based retransmission The fifth candidate resource that does not overlap;

The associated physical side link feedback channel (PSFCH) overlaps with the physical side link feedback channel (PSFCH) associated with the reserved resource, and is different from the reserved resource reserved for feedback-based retransmission. The sixth candidate resource that overlaps;

The associated physical side link feedback channel (PSFCH) does not overlap with the physical side link feedback channel (PSFCH) associated with the reserved resource, and is identical to the reserved resource reserved for feedback-based retransmission The seventh candidate resource that has overlapped;

The associated physical side link feedback channel (PSFCH) overlaps with the physical side link feedback channel (PSFCH) associated with the reserved resource, and overlaps with the reserved resource reserved for feedback-based retransmission. Overlapping eighth candidate resource.

Appendix 19. The method according to Appendix 18, wherein the determining whether to exclude the candidate resource or reduce the priority of the candidate resource according to the comparison result includes at least one or any combination of the following:

In the case where the signal measurement result of the reserved resource is higher than the fifth signal threshold and/or the distance measurement result of the reserved resource is less than the fifth distance threshold, the fifth candidate resource is excluded or the first Five priority of candidate resources;

In the case where the signal measurement result of the reserved resource is higher than the sixth signal threshold and/or the distance measurement result of the reserved resource is smaller than the sixth distance threshold, the sixth candidate resource is excluded or the first Six priority of candidate resources;

In the case where the signal measurement result of the reserved resource is higher than the seventh signal threshold and/or the distance measurement result of the reserved resource is less than the seventh distance threshold, the seventh candidate resource is excluded or the first candidate resource is reduced. 7. Priority of candidate resources;

In the case where the signal measurement result of the reserved resource is higher than the eighth signal threshold and/or the distance measurement result of the reserved resource is less than the eighth distance threshold, the eighth candidate resource is excluded or the first 8. Priority of candidate resources.

Supplement 20. The method according to any one of Supplements 1 to 19, wherein the method further comprises:

The candidate resources are moved from the first set into the second set; wherein, at least two types of candidate resources in the first set are moved into the second set with different priorities.

Supplement 21. The method according to any one of Supplements 1 to 19, wherein the method further includes:

Move the candidate resources from the first set into the second set, and select resources for side link transmission from the second set; wherein, at least two types of candidate resources in the second set have different Probability of choice.

Supplement 22. The method according to any one of Supplements 1 to 21, wherein whether to enable the use of different resource selection thresholds for different candidate resources is pre-configured or predefined, or whether to enable the use of different candidate resources Different resource selection thresholds are configured by network devices or other terminal devices.

Supplement 23. The method according to any one of Supplements 1 to 22, wherein the method further includes:

Determining, by the terminal device, a candidate resource corresponding to a resource included in the sensing window but not being sensed; wherein the candidate resource includes at least two time slots that are continuous in time; and

Excluding the candidate resource or lowering the priority of the candidate resource.

Supplement 24. The method according to Supplement 23, wherein, in the case that a resource pool is configured or pre-configured to support one or more time slots of at least two time slots that are continuous in time, the The number of time slots included in the candidate resource is the largest number of time slots among the number of one or more types of time slots.

Supplement 25. A resource allocation method, including:

The terminal device is configured or pre-configured with one or more resource pools for side link transmission;

Among them, a resource pool is configured or pre-configured to be able to use at least two consecutive time slots in time for side link transmission, and/or is configured or pre-configured to support at least two consecutive time slots in time The number of one or more time slots of the slot.

Supplement 26. The method according to Supplement 25, wherein, in the case that the resource pool is configured or pre-configured to support one or more time slots of at least two time slots that are continuous in time, The number of time slots included in the candidate resource is the largest number of time slots among the number of one or more types of time slots.

Appendix 27. A terminal device including a memory and a processor, the memory storing a computer program, and the processor is configured to execute the computer program to implement the resource as described in any one of appendix 1 to 24 Selection method, or resource allocation method as described in Supplement 25 or 26.

Claims (20)

A resource selection device, including: The comparing unit compares the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource when the candidate resource and the reserved resource overlap, wherein at least two types of candidate resources correspond to different resource selections Threshold; and A determining unit, which determines whether to exclude the candidate resource or whether to reduce the priority of the candidate resource according to the comparison result. The apparatus according to claim 1, wherein the measurement result of the reserved resource includes a signal measurement result between the terminal equipment and other terminal equipment that reserves the reserved resource, and the resource selection threshold includes all The signal threshold of the signal measurement result; and/or The measurement result of the reserved resource includes a distance measurement result between the terminal device and other terminal devices that reserve the reserved resource, and the resource selection threshold includes a distance threshold of the distance measurement result. The device according to claim 2, wherein the signal measurement result comprises at least one of the following: reference signal received power, received signal strength indicator, reference signal received quality, signal-to-noise ratio, signal-to-interference and noise ratio; When calculating the received signal strength indicator, the signal strength of the physical side link shared channel that carries at least the channel state information is excluded. The apparatus according to claim 1, wherein the candidate resource includes at least one of the following: The first candidate resource in which the associated physical side link feedback channel and the physical side link feedback channel associated with the reserved resource do not overlap; The second candidate resource where the associated physical side link feedback channel overlaps with the physical side link feedback channel associated with the reserved resource. The device according to claim 4, wherein the determining unit is configured to: When the signal measurement result of the reserved resource is higher than the first signal threshold and/or the distance measurement result of the reserved resource is smaller than the first distance threshold, the first candidate resource is excluded or the first candidate resource is reduced. The priority of a candidate resource; and/or In the case where the signal measurement result of the reserved resource is higher than the second signal threshold and/or the distance measurement result of the reserved resource is smaller than the second distance threshold, the second candidate resource is excluded or the first candidate resource is reduced. 2. Priority of candidate resources; Wherein, the second signal threshold value is less than the first signal threshold value, and/or the second distance threshold value is greater than the first distance threshold value. The device according to claim 5, wherein the device further comprises: An adjustment unit, which increases the first signal threshold and/or the second signal threshold, and/or reduces the first distance when the number of candidate resources remaining in the first set is less than the threshold A threshold and/or the second distance threshold; In addition, the comparison unit compares the updated resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, and the determining unit determines whether to exclude the candidate resource or whether to reduce the candidate resource according to the comparison result. The priority of the candidate resource. 7. The apparatus of claim 6, wherein the first signal threshold and the second signal threshold are alternately updated, and/or the first distance threshold and the second distance threshold are alternately updated. The method according to claim 4, wherein the terminal device assumes that each of the reserved resources is associated with the physical side link feedback channel, or indicates through a reservation signal that the reserved resources are associated with The physical side link feedback channel. The apparatus according to claim 1, wherein the candidate resource includes at least one of the following: A third candidate resource that does not overlap with the reserved resource reserved for feedback-based retransmission; A fourth candidate resource that overlaps with the reserved resource reserved for feedback-based retransmission. The device according to claim 9, wherein the determining unit is configured to: In the case where the signal measurement result of the reserved resource is higher than the third signal threshold and/or the distance measurement result of the reserved resource is smaller than the third distance threshold, the third candidate resource is excluded or the first Priority of three candidate resources; and/or In the case where the signal measurement result of the reserved resource is higher than the fourth signal threshold and/or the distance measurement result of the reserved resource is less than the fourth distance threshold, the fourth candidate resource is excluded or the first Four priority of candidate resources; Wherein, the fourth signal threshold is greater than the third signal threshold, and/or the fourth distance threshold is less than the third distance threshold. The device according to claim 10, wherein the device further comprises: An adjustment unit, which increases the third signal threshold and/or the fourth signal threshold, and/or reduces the third distance when the number of candidate resources remaining in the first set is less than the threshold A threshold and/or the fourth distance threshold; In addition, the comparison unit compares the updated resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, and the determining unit determines whether to exclude the candidate resource or whether to reduce the candidate resource according to the comparison result. The priority of the candidate resource. The apparatus according to claim 11, wherein the third signal threshold and the fourth signal threshold are updated alternately, and/or the third distance threshold and the fourth distance threshold are alternately updated. The apparatus according to claim 9, wherein a reservation signal indicates that the reserved resources are resources reserved for feedback-based retransmission. The apparatus according to claim 1, wherein the candidate resource includes at least one of the following: The associated physical side link feedback channel does not overlap with the physical side link feedback channel associated with the reserved resource, and does not overlap with the fifth reserved resource reserved for feedback-based retransmission. Candidate resources; The associated physical side link feedback channel overlaps the physical side link feedback channel associated with the reserved resource, and does not overlap the sixth candidate with the reserved resource reserved for feedback-based retransmission Resources; The seventh candidate whose associated physical side link feedback channel does not overlap with the physical side link feedback channel associated with the reserved resource, and overlaps with the reserved resource reserved for feedback-based retransmission Resources; The eighth candidate resource whose associated physical side link feedback channel overlaps with the physical side link feedback channel associated with the reserved resource, and overlaps with the reserved resource reserved for feedback-based retransmission . The device according to claim 14, wherein the determining unit performs at least one or any combination of the following operations: In the case where the signal measurement result of the reserved resource is higher than the fifth signal threshold and/or the distance measurement result of the reserved resource is less than the fifth distance threshold, the fifth candidate resource is excluded or the first Five priority of candidate resources; In the case where the signal measurement result of the reserved resource is higher than the sixth signal threshold and/or the distance measurement result of the reserved resource is smaller than the sixth distance threshold, the sixth candidate resource is excluded or the first Six priority of candidate resources; In the case where the signal measurement result of the reserved resource is higher than the seventh signal threshold and/or the distance measurement result of the reserved resource is less than the seventh distance threshold, the seventh candidate resource is excluded or the first candidate resource is reduced. 7. Priority of candidate resources; In the case where the signal measurement result of the reserved resource is higher than the eighth signal threshold and/or the distance measurement result of the reserved resource is less than the eighth distance threshold, the eighth candidate resource is excluded or the first 8. Priority of candidate resources. The device according to claim 1, wherein the device further comprises: A move-in unit that moves the candidate resource from the first set to the second set; wherein at least two types of candidate resources in the first set are moved into the second set with different priorities; or Move the candidate resources from the first set into the second set, and select resources for side link transmission from the second set; wherein, at least two types of candidate resources in the second set have different Probability of choice. The device according to claim 1, wherein the determining unit is further configured to: Determine candidate resources corresponding to resources included in the sensing window but not perceived, where the candidate resources include at least two consecutive time slots in time; and exclude the candidate resources or reduce the priority of the candidate resources level. The apparatus according to claim 17, wherein, in the case that a resource pool is configured or pre-configured to support one or more timeslot numbers of at least two timeslots continuous in time, the candidate resource The number of time slots is the largest number of time slots among the number of one or more types of time slots. A method of resource selection, including: When the candidate resource and the reserved resource overlap, the terminal device compares the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource, wherein at least two types of candidate resources correspond to different resource selection thresholds; as well as According to the comparison result, it is determined whether to exclude the candidate resource or whether to reduce the priority of the candidate resource. A communication system including: A terminal device that compares the resource selection threshold corresponding to the candidate resource with the measurement result of the reserved resource when the candidate resource and the reserved resource overlap, wherein at least two types of candidate resources correspond to different resource selections Threshold; and determining whether to exclude the candidate resource or whether to reduce the priority of the candidate resource according to the comparison result.

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