TW201924371A - User equipment and resource sensing and selection method thereof - Google Patents

Abstract

A user equipment (UE) and a resource sensing and selection method thereof, which is adapted for vehicle-to-everything (V2X) mode 4, are provided. The resource sensing and selection method includes the following steps. Channel usage situations of all the component carriers (CCs) are measured and obtained. Multiple candidate CCs are determined from all the CCs according to the measurement values of the channel usage situations and ProSe per-packet priority (PPPP) of the UE. Resource sensing and selection is performed on the selected usable CCs, which are at least one CCs selected from the candidate CCs.

Description

User equipment and its resource sensing and selection method

The invention relates to a user equipment and a resource sensing and selection method thereof.

The Third Generation Partnership Project (3GPP) created Cellular Vehicle-to-Everything (C-) in Long Term Evolution (LTE) Release 14 V2X) standard. C-V2X is mainly a LTE-based vehicle communication technology for various objects. For example, communicating with other vehicles, transportation infrastructure, and users. In addition, the architecture of C-V2X is based on Proximity-based Services (ProSe) technology for device-to-device (D2D) communication. Vehicle-to-vehicle (V2V) communication is an extension of device-to-device communication, and a device-to-device PC5 Interface is a technology that enhances the direct connection and communication between two vehicles.

In the discussion topics of the 3GPP V2X Phase 2 Study Item and Work Item of Release 15, Carrier Aggregation (CA) and the reduction of physical layer packets Two issues of PC5 functions, such as arrival and resource selection maximum latency, have been proposed as targets, and these two issues will be compatible with the Resource Pool and Scheduling Assignment defined in version 14. , SA) format coexist. Among them, in order to reduce the delay time of the physical layer, the 3GPP standard conference has concluded that the resource selection window is reduced (that is, the T2 parameter is reduced). Figure 1 is a schematic diagram of the resource sensing and selection window of the 14th version. Please refer to FIG. 1. The parameter T2 of the original resource selection (reselection) window time length is between 20 and 100 milliseconds (ms), so reducing it may make it less than 20ms. As shown in FIG. 1, n is a time reference point, and n + T1 ~ n + T2 are time ranges of the resource selection window. The reduction of the resource selection window will result in a shortage of resources that can be selected for data transmission, thereby increasing the chances of different user equipment (User Equipment, UE) selecting the same resource (ie, collision). And the use of carrier aggregation can add multiple component carriers (CCs) to alleviate the problem of collision of resource selection mentioned above. However, in the context of carrier aggregation, how to make more user equipment improve the spectrum utilization efficiency without the assistance of a base station (ie, V2X Mode 4) is one of the main problems. It can be known that, for the issues of carrier aggregation and reduction of the resource selection window, a solution needs to be proposed to solve.

The invention provides a user equipment and a resource sensing and selecting method thereof.

In an embodiment of the present invention, the resource sensing and selection method of the present invention is applicable to a user equipment (User Equipment, UE) using Vehicle-to-Everything (V2X) mode four, that is, The method of resource sensing and selection for a vehicle-connected communication user equipment without a base station assistance includes the following steps. Measure and obtain the channel usage of all component carriers (CCs). Based on the channel usage measurement values of these component carriers and the ProSe Per-Packet Priority (PPPP) of the proximity service corresponding to this user equipment, a number of candidate component carriers are determined from those component carriers. Selecting at least one of these candidate component carriers is selecting a component carrier to be used and performing resource sensing and selection.

In an embodiment of the present invention, the above-mentioned user equipment of the present invention uses the vehicle-to-vehicle communication mode IV. This user equipment includes at least, but not limited to, a receiver, a transmitter, and a processor. The receiver is used for receiving signals. The transmitter is used for transmitting signals. The processor is coupled to the receiver and the transmitter. The processor is configured to perform the following steps. Through the receiver, the channel usage of all component carriers is obtained through measurement. Several candidate component carriers are determined from those component carriers based on the channel usage measurement values of these component carriers and the individual packet priority of the proximity service corresponding to this user equipment. At least one of these candidate component carriers is selected as the component carrier that is selected for use, and resource sensing and selection are performed on the selected component carrier by the receiver.

In order to make the above features and advantages of the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram illustrating components of the user equipment 100 according to an embodiment of the present invention. Please refer to FIG. 2, the user equipment 100 uses Vehicle-to-Everything (V2X) mode 4 (also may be Vehicle-to-Vehicle (V2V), device-to-device (V2V) Device-to-Device (D2D) and other two devices communicate directly) and support Carrier Aggregation (CA) technology. The user equipment 100 may have various implementations, which may be a device or a device fixed on a movable vehicle (for example, an automobile, a locomotive, a bicycle, a ship, an airplane, etc.), or a device on a movable vehicle ( (E.g. mobile phone, laptop, tablet or watch, etc.).

The user equipment 100 includes at least, but not limited to, one or more antennas 110, receivers 120, transmitters 130, analog-to-digital (A / D) and digital-to-analog (D / A) converters 140, storage 150, and Processor 160.

The receiver 120 and the transmitter 130 are respectively used to wirelessly receive signals and transmit signals through the antenna 110. The receiver 120 and the transmitter 130 may also perform analog signal processing operations such as low-noise amplification, impedance matching, mixing, up- or down-conversion, filtering, amplification, and the like. The analog-to-digital and digital-to-analog converter 140 is configured to convert an analog signal format into a digital signal format, and convert a digital signal format into an analog signal format.

The memory 150 may be any type of fixed or removable random access memory (RAM), read-only memory (ROM), flash memory (Flash Memory), or similar elements Or a combination of the above. The storage 150 is used to store code, device configuration, codebook, buffered or permanent data (e.g., channel usage threshold-ProSe Per-packet Priority (PPPP) mapping table , Channel usage measurement, user equipment capability (Capability) information, resource occupancy information, energy thresholds, previous information, etc., and the details of which will be explained later), and records such as the physical layer , Media Access Control (MAC) layer, Logical Link Control (LLC) layer, network service layer, and other software modules related to various other communication protocols.

The processor 160 is configured to process digital signals and execute a program according to an exemplary embodiment of the present invention, and may access or load data and software modules recorded in the storage 150. The functions of the processor 160 can be achieved by using, for example, a central processing unit (CPU), a microprocessor, a microcontroller, a digital signal processing (DSP) chip, and a field programmable logic gate array (Field). Programmable Gate Array (FPGA) and other programmable units. The functions of the processor 160 may also be implemented by an independent electronic device or an integrated circuit (IC), and the operations of the processor 160 may also be implemented by software.

In order to facilitate the understanding of the operation flow of the embodiments of the present invention, the following describes the operation flow of the user equipment 100 in the embodiments of the present invention in detail.

FIG. 3 is a flowchart illustrating a resource sensing and selection method according to an embodiment of the present invention. Referring to FIG. 3, the method in this embodiment is applicable to the user equipment 100 in FIG. 2. In the following, the method according to the embodiment of the present invention will be described with various components and modules of the user equipment 100. Each process of the method can be adjusted according to the implementation situation, and is not limited to this.

The processor 160 measures and obtains the channel usage of all component carriers through the receiver 120 (step S310). Specifically, the CA technology can combine two or more continuous or discontinuous specific bandwidths (for example, 10, 20, or 50 MHz) component carriers at the same time to increase the total bandwidth of data transmission and thus the transmission speed. The increase in the number of component carriers that the user equipment 100 can select (for example, 3GPP V2X phase 2 Study Item / Work Item has defined that CA can use up to eight component carriers), which will increase the available (radio) resources. If the user equipment 100 can effectively schedule the resource selection, it will help improve the transmission efficiency of a single user equipment or even the entire system. Among them, the channel usage can be information to evaluate whether the resource is occupied, busy, idle, and / or interference, and its measured value can be the Channel Busy Ratio (CBR) value, the channel occupancy rate (Channel Occupancy Ratio (CR), Received Signal Strength Indication (RSSI), Reference Signal Received Quality (RSRQ), Reference Signal Received Power (RSRP), Signal-to-Noise Ratio, etc. Use relevant values.

In an embodiment, the time of resource sensing of each component carrier is related to a specific period (for example, the sensing window shown in FIG. 1 has a duration of 1000 milliseconds (ms)), and the processor 160 senses this. The window or other period for resource sensing is divided in one or more measurement periods (for example, 50, 100, 200, and / or 500 ms, which can be randomly determined or defined in advance). For example, if the measurement period is 500 ms, a sensing window can be divided into two measurement periods. The processor 160 can obtain the channel usage of all the component carriers in one or more measurement cycles through the measurement through the receiver 120.

4A and 4B are schematic diagrams illustrating resource sensing in two examples. Please refer to FIG. 4A first, assuming that the sensing window SW for resource sensing is 1000 ms, and the measurement periods MP1, MP2, MP3, and MP4 are 50, 100, 200, and 500 ms, respectively. The processor 160 may randomly / arbitrarily or specifically select a certain measurement period MP1 ~ MP4 (may overlap or not overlap with each other) in a sensing window SW of each component carrier, and select these measurement periods MP1 ~ MP4 Measure the CBR value during the process. The processor 160 may arbitrarily or specifically select one or more measured CBR values from these measurement periods MP1 to MP4; if the processor 160 only selects one measurement period MP1, MP2, MP3 or MP4, then directly select this The CBR corresponding to the measurement period MP1, MP2, MP3 or MP4 is used as the measurement value of the rough estimation channel usage of the component carrier; and if the processor 160 selects more than one from the measurement periods MP1, MP2, MP3 and MP4, then The average value of the selected CBR is used as the measurement value of the rough estimation channel usage of the component carrier.

Please refer to FIG. 4B. Assume that the sensing window SW is 1000 ms, and the measurement periods MP1, MP2, MP3, and MP4 are 50, 100, 200, and 500 ms, respectively. The processor 160 may equally share a sensing window SW of each carrier with different measurement periods MP1 to MP4, and measure the CBR value during each measurement period MP1 to MP4. For each measurement period MP1 to MP4, the processor 160 first obtains the average value of the corresponding CBR value. The processor 160 may arbitrarily or specifically select the average value of one or more measured CBRs from these measurement periods MP1 to MP4; if the processor 160 selects only one measurement period MP1, MP2, MP3 or MP4, it will directly The average value of the CBR corresponding to the selected measurement period MP1, MP2, MP3, or MP4 is used as the measurement value of the rough estimation channel usage of the component carrier. If more than one is selected, the average value of the selected CBR average is re-averaged (the average of the selected measurement period corresponds to the average of the CBR and divided by the number of selected measurement periods) as a rough estimation channel for the component carrier Measurements of usage.

It should be noted that the size and channel usage of the measurement periods MP1 to MP4 shown in Figs. 4A and 4B are only suitable for illustration, and those applying the embodiments of the present invention may change according to actual needs.

The processor 160 may determine a plurality of candidate constituent carriers from those constituent carriers according to the channel usage measurement values of all constituent carriers and the ProSe Per-Packet Priority (PPPP) of the proximity service corresponding to this user equipment 100. (Step S330). Specifically, the transmission between the two user equipments 100 in the V2X mode 4 is via the PC5 interface. According to 3GPP TS 23.303 and TS 36.300 standards, when the ProSe upper layer transmits the protocol data unit on the PC5 interface, the ProSe upper layer will provide PPPP information for this transmission (from 8 possible numerical values). Pick from range). And this PPPP information is a quantified value related to the agreement data unit, and it gives priority to the transmission of the agreement data unit. Each user equipment 100 will be assigned a specific PPPP value, so that PC5-S messages or other protocol data units transmitted by each user equipment 100 can be given priority (for example, higher priority transmissions are processed preferentially, Lower priority transmissions are processed later).

FIG. 5 is a schematic diagram illustrating information exchanged at different layers according to an embodiment of the present invention. Please refer to FIG. 5. From the perspective of a protocol stack, the processor 160 executes the physical layer 161 software module and measures the rough channel usage measurements (for example, CBR value, CR value, (Signal strength, etc.) (please refer to the description of step S310) to the upper layer 163. The processor 160 executes the upper layer 163 software module, and determines candidate constituent carriers from all constituent carriers based on channel usage measurement values of all constituent carriers and PPPP assigned by the user equipment 100, and transmits the determined candidate constituent carriers. To the physical layer 161. The method for determining candidate component carriers will be described below.

In an embodiment, the processor 160 compares the channel usage measurement value of each component carrier with the PPPP corresponding channel of the user equipment 100 in each corresponding component carrier using a threshold value to determine whether the component carrier is a busy component carrier. Or idle to form a carrier. The channel use threshold value is, for example, a CBR threshold value, a CR threshold value, a signal-to-noise ratio threshold value, and the like, and corresponds to the type of channel usage. Data transmission during the busy component carrier transmission will be severely disrupted, and it may cause transmission failure or excessive failure. On the other hand, the idle component carrier can be used as a candidate component carrier, and the data transmission on it is less affected than the transmission on the busy component carrier. The measured value of the channel usage of a component carrier among all the component carriers is smaller than the corresponding channel usage threshold, and the processor 160 uses this component carrier as a candidate component carrier. In response to the measurement of the channel usage of this component carrier being not less than the corresponding channel usage threshold, the processor 160 does not use (or disable \ stop) this component carrier as a candidate component carrier. It can be known that the decision of the channel usage threshold may affect the decision of candidate constituent carriers.

In one embodiment, the processor 160 obtains the channel usage threshold-PPPP mapping table (defined in advance or receiving instructions from other devices). And this channel use threshold value-PPPP mapping table records all component carrier use threshold values for all channels corresponding to all corresponding PPPPs. The processor 160 may match the channel usage measurement value of the user equipment 100 with a PPPP in each component carrier with the channel usage threshold value-the corresponding PPPP in the PPPP mapping table corresponding to each corresponding component carrier. Of channels use threshold matching. The usage threshold of this channel can be between an upper and lower limit, and the upper and lower limits may be fixed or adjustable. For example, the upper limit value for the CBR threshold value is 0.8 and the lower limit value is 0.35.

In one embodiment, all PPPPs recorded in the channel use threshold-PPPP mapping table include their corresponding indexes and can be arranged according to the priority order. For example, the channel usage threshold-PPPP mapping table records the first PPPP to the m-th PPPP (that is, PPPP1 to PPPPm, where the PPPPi index i is a positive integer between 1 and m). The first PPPP has the highest priority, the second PPPP has the second highest priority, and so on, the mth PPPP has the lowest priority. Each PPPP corresponds to at least one service type, and the priority order of these service types is the same.

In addition, for each PPPP, a specific number of component carriers is assigned. In an embodiment, the number of component carriers corresponding to all PPPPs recorded in the channel usage threshold-PPPP mapping table is that the higher the priority of PPPP (that is, the higher the priority), the number of component carriers is greater than Or the number of component carriers of the lower priority order of PPPP (ie, the lower priority), expressed mathematically as follows: … (1) where Represents the number of component carriers corresponding to the first PPPP, and so on. In other words, the higher the priority of PPPP, the more it can be allocated to more component carriers, in order to reduce the probability of resource selection collision and improve its reliability.

In one embodiment, all component carriers corresponding to each PPPP recorded in the channel use threshold-PPPP mapping table, including their corresponding indexes, are arranged according to the priority order. The priority order of the component carriers corresponding to each PPPP is that the index of the component carrier with the higher priority is less than or equal to the index of the component carrier with the lower priority. For example, the channel uses a threshold-PPPP mapping table to record that PPPP1 corresponds to M component carriers, including the first component carrier to the Mth component carrier (that is, CC1 to CCM, where the component carrier CCi index i is a positive value between 1 and M). Integer), the priority is CC1³ CC2³ ••• ³ CCM. In addition, this channel uses the threshold-PPPP mapping table to record the index of the former in the constituent carriers corresponding to each PPPP. The index of the former in the constituent carriers with the higher priority of PPPP is less than or equal to The lower priority of PPPP is the index of the former in the component carrier. The relationship is expressed mathematically as follows: … (2) where It represents the index offset of the component carrier corresponding to the first PPPP (the index offset value plus one is the index of the former in the highest order), and so on. The index of the component carrier corresponding to the i-th PPPP (the index i is a positive integer between 1 and m) is ,among them . For example, the number of component carriers of the first PPPP is eight, and corresponds to the first component carrier to the eighth component carrier, where And (The index of the former of the former is l ₁ + 1 = 1); the number of constituent carriers of the eighth PPPP is 1, and corresponds to the eighth constituent carrier, where And (The index of the former of the sort order is l ₈ + 1 = 8). In other words, the higher the priority of PPPP, the more likely it will be assigned to the component carrier whose index is earlier in the ranking order. In summary, the higher the priority of PPPP, the higher the priority of the component carrier assigned to the index in the ranking order, and the priority of the component carrier corresponding to each PPPP. It is possible to decentralize the configuration of the component carriers corresponding to PPPP as much as possible and help As far as possible, each PPPP corresponds to a different component carrier as a candidate component carrier to reduce the probability of resource selection collision and improve its reliability.

In different embodiments, the channel use thresholds-PPPP recorded in the PPPP mapping table may have different channel use thresholds corresponding to different component carriers. In an embodiment, the channel use threshold value in the component carriers corresponding to each PPPP is an arrangement order higher than the former (that is, a smaller index value) than an arrangement order higher than the latter (that is, a larger index value). In mathematical terms: … (3) where It means that the i-th PPPP uses the threshold value on the n- _th channel forming the carrier, and the rest can be deduced by analogy. For example, the CBR threshold value of the first PPPP corresponding to the first component carrier is 0.8, and the CBR threshold value of the second component carrier corresponds to 0.75. In other words, the same PPPP has a higher channel usage threshold corresponding to the index of the corresponding component carrier. If the channel usage threshold is lower, it means that the chance that the component carrier is determined as a candidate component carrier is lower. That is, based on this configuration, if the channel measurement values obtained for each component carrier are roughly the same, the processor 160 determines the opportunity for the component carrier with the index earlier (that is, the smaller the value) as the candidate component carrier. Relatively high. This can help make each PPPP correspond to different component carriers as candidate component carriers as much as possible to reduce the probability of resource selection collision and improve its reliability.

And there may be more than one PPPP corresponding to any component carrier, and a single component carrier may correspond to a PPPP group that includes one or several PPPPs. All PPPPs in the same PPPP group have corresponding component carrier numbers and component carrier index offset The values are the same. In one embodiment, the channel usage thresholds recorded in the PPPP mapping table and the corresponding channel usage thresholds of all corresponding PPPPs in each component carrier may be different. For example, in the third component carrier, the channel usage threshold of the first PPPP is 0.65, and the channel usage threshold of the second PPPP is 0.7.

In addition, the channel selection thresholds corresponding to the resource selection windows of different lengths of time (as shown in FIG. 1, that is, parameter T2)-the channel usage thresholds recorded in the PPPP mapping table may be different, and the user equipment 100 in this resource selection window Make resource selection. In an embodiment, assuming that the time length of the first resource selection window is shorter than the time length of the second resource selection window, the channel corresponding to the first resource selection window uses a channel corresponding to a component carrier recorded in the threshold-PPPP mapping table. The usage threshold value should be greater than the channel usage threshold value corresponding to the second resource selection window-the channel usage threshold value of the same component carrier recorded in the PPPP mapping table. That is, in response to the shortening of the time length of the resource selection window, the channel usage threshold corresponding to the same component carrier will be increased, thereby increasing the chance of determining the component carrier as a candidate component carrier and reducing the probability of resource selection collision. For example, a mapping table corresponding to a time length of 10ms for the first resource selection window corresponds to a channel usage threshold of 0.7 for a third PPPP in a third component carrier, and a mapping corresponding to a time length of 20ms for the second resource selection window. The channel usage threshold value corresponding to the third PPPP in the same third component carrier is 0.6.

In order to facilitate the reader's understanding, Tables (1) to (10) are taken as examples below, which are examples of the CBR-PPPP-service type mapping table. The parameter m of the number of PPPPs in the table (1) to the table (6) and the parameter M of the number of the carriers are 8. Among them, the PPPP groups in Table (1), Table (3), and Table (5) include one, two, and three PPPPs, respectively, and the parameter T2 of the resource selection window is 20 ms; and Table (2), Table (4) and Table (6) The PPPP groups also include one, two, and three PPPPs, respectively, and the parameter T2 of the resource selection window is 10 ms. Each of the PPPP groups in Tables (7) to (10) includes two PPPPs. Among them, the combination of the parameter m of the number of PPPPs in the table (7) and the table (9) and the parameter (m, M) of the parameter M of the number of carriers are (8, 4) and (4, 8), and The parameter T2 of the resource selection window is 20ms; and the combination of the parameter m of the number of PPPPs in the table (8) and table (10) and the parameter (m, M) of the number of parameters constituting the number of carriers are also (8, 4) ) And (4,8), the parameter T2 of the resource selection window is 10ms. In addition, there are two service types in Tables (1) to (10), including two service types such as # 1 and # 2.

The PPPP group corresponding to a single component carrier in Table (1) includes one PPPP. The parameter T2 of the resource selection window is 20ms, and the number of component carriers corresponding to PPPP1 to PPPP8 is And the index deviation of the component carriers corresponding to PPPP1 ~ PPPP8 is . Table 1)

The PPPP group corresponding to a single component carrier in Table (2) includes one PPPP. The parameter T2 of the resource selection window is 10ms, and the number of component carriers corresponding to PPPP1 to PPPP8 is And the index deviation of the component carriers corresponding to PPPP1 ~ PPPP8 is . Table 2)

The PPPP group corresponding to a single component carrier in Table (3) includes two PPPPs. The parameter T2 of the resource selection window is 20ms, and the number of component carriers corresponding to PPPP1 to PPPP8 is And the index deviation of the component carriers corresponding to PPPP1 ~ PPPP8 is . table 3)

The PPPP group corresponding to a single component carrier in Table (4) includes two PPPPs. The parameter T2 of the resource selection window is 10ms, and the number of component carriers corresponding to PPPP1 to PPPP8 is And the index deviation of the component carriers corresponding to PPPP1 ~ PPPP8 is . Table 4)

The PPPP group corresponding to a single component carrier in Table (5) includes three PPPPs. The parameter T2 of the resource selection window is 20ms, and the number of component carriers corresponding to PPPP1 to PPPP8 is And the index deviation of the component carriers corresponding to PPPP1 ~ PPPP8 is . table 5)

The PPPP group corresponding to a single component carrier in Table (6) includes three PPPPs. The parameter T2 of the resource selection window is 10ms, and the number of component carriers corresponding to PPPP1 to PPPP8 is And the index deviation of the component carriers corresponding to PPPP1 ~ PPPP8 is . Table (6)

The PPPP group corresponding to a single component carrier in Table (7) includes two PPPPs. The parameter T2 of the resource selection window is 20ms, and the number of component carriers corresponding to PPPP1 to PPPP8 is And the index deviation of the component carriers corresponding to PPPP1 ~ PPPP8 is . Table (7)

The PPPP group corresponding to a single component carrier in Table (8) includes two PPPPs. The parameter T2 of the resource selection window is 10ms, and the number of component carriers corresponding to PPPP1 to PPPP8 is And the index deviation of the component carriers corresponding to PPPP1 ~ PPPP8 is . Table (8)

The PPPP group corresponding to a single component carrier in Table (9) includes two PPPPs. The parameter T2 of the resource selection window is 20ms, and the number of component carriers corresponding to PPPP1 to PPPP4 is And the index deviation of the component carriers corresponding to PPPP1 ~ PPPP4 is . Table (9)

The PPPP group corresponding to a single component carrier in Table (10) includes two PPPPs. The parameter T2 of the resource selection window is 10ms, and the number of component carriers corresponding to PPPP1 to PPPP4 is And the index deviation of the component carriers corresponding to PPPP1 ~ PPPP4 is . Table (10)

Taking table (10) as an example, it is assumed that the user equipment 100 is set to the fourth PPPP (ie, PPPP4) and the channel usage measurement values of all the constituent carriers calculated by its processor 160 (this example is CBR Value) are all 0.68. It can be seen from Table (10) that the fourth PPPP corresponds to the fifth, sixth, seventh, and eighth component carriers, and the corresponding CBR thresholds are 0.75, 0.7, 0.65, and 0.6, respectively. Because the channel usage measurements of the fifth and sixth component carriers corresponding to PPPP4 (0.68, 0.68, respectively) are less than the corresponding CBR thresholds (0.75, 0.7, respectively), the fifth and sixth component carriers can be used as Candidates of the user equipment 100 constitute a carrier. The channel usage measurements of the seventh and eighth component carriers corresponding to PPPP4 (0.68, 0.68, respectively) are greater than the corresponding CBR thresholds (0.65, 0.6 respectively), so the seventh and eighth component carriers cannot be used as Candidates of the user equipment 100 constitute a carrier.

Then, the processor 160 selects at least one of the candidate component carriers as a component carrier to be used and performs resource sensing and selection on the at least one component carrier to be selected through the receiver 120 (step S350). In an embodiment, the processor 160 may determine at least one component carrier to be selected for use from among the candidate component carriers based on the priority order of those candidate component carriers and the capability of the user equipment 100 (ie, UE capability). In this embodiment, the higher the index of the component carrier corresponding to each PPPP in the arrangement order, the higher the priority of the component carrier. For example, the first component carrier has a higher priority than the second component carrier. The capability of the user equipment 100 is related to the number of concurrent carriers supported by the user equipment 100 (including the transmitting end, the receiving end, or both), the supported frequency bands, whether carrier aggregation is supported, and / or the allowed bandwidth And other parameters.

FIG. 6 is a schematic diagram illustrating selection of a component carrier to be selected for use according to an embodiment of the present invention. Referring to FIG. 6, it is assumed that the user equipment 100 obtains the candidate component carriers as the first to fourth component carriers through the foregoing steps S310 and S330, and the capability of the user equipment 100 is to be able to use two component carriers to transmit data. Therefore, the processor 160 selects the two with the highest priority (ie, the first and second component carriers) as the component carriers for selection.

In another embodiment, if the number of component carriers that the user equipment 100 can simultaneously use to transmit data is greater than or equal to the number of candidate component carriers obtained in step S330, the processor 160 directly combines all the candidate components. The carrier is used as a constituent carrier.

After deciding which component carrier to use, please refer to FIG. 7, which is a flowchart illustrating resource sensing and selection of the component carrier to be used according to an embodiment of the present invention. The processor 160 performs resource sensing and selection on at least one component carrier selected for use through the receiver 120 (step S710). That is, there is no need to perform resource sensing and selection for other component carriers that are not selected for use. To perform resource sensing for each selected component carrier, first, each selected component carrier resource is divided into multiple resource units (RUs) by time and / or frequency. The size of the resource unit is determined by The upper layer is configured and includes at least one resource block (RB). In one embodiment, the processor 160 may determine the idle resource units in the component carriers selected for use according to the resource occupation information. This resource occupation information is related to the resource allocation situation of data transmission, and this idle resource unit is a candidate resource for resource selection. For example, the processor 160 may receive a Scheduling Assignment (SA) message (to indicate which of the resources are used to transmit data when the receiver 120 is received), or a physical side link control channel (Physical Sidelink Control) Channel (PSCCH) message), and parse the SA message to obtain resource occupation information (for example, a resource is allocated or scheduled for data transmission and a resource pattern of the data transmission (Resource pattern)).

8A to 8D are schematic diagrams illustrating resource sensing according to an embodiment of the present invention. Please refer to FIG. 8A first. The left side of the figure shows that the resource R (Resource) is divided into several SA periodic resource areas by time (such as a subframe) and frequency. The SA periodic resource area is composed of multiple resource units. Each resource unit includes at least one resource block, and its size is set by the upper layer. The processor 160 parses the SA message to obtain, for example, a Time Resource Pattern of Transmission (T-RPT), which includes resource location information for data transmission. The right side of the figure shows the format of the SA cycle resource area. In an SA cycle resource area, the resource area is divided into an SA area and a data area. The T-RPT is recorded in the SA area, and the data area carries the data to be transmitted. The processor 160 may determine whether each resource unit in the data area is a busy resource unit or an idle resource unit by receiving and analyzing the resource scheduling assignment information of the SA area in each SA cycle resource area. As shown in FIG. 8B, the busy resource unit indicates that it is occupied or that data transmission is scheduled, and the idle resource unit indicates that it is not occupied or that no data transmission is scheduled.

If the resource locations of the SA part and the data part shown in FIG. 8A are configured in advance (that is, the positions of the resources of the SA part and the data part corresponding to each user equipment are fixed and known by other user equipment in advance ), The idle resource area, the decodable resource area and the collision resource area can be determined as described in the following embodiments. For the free resource area, if the signal strength of the SA part is less than the preset threshold, and the processor 160 cannot decode the T-RPT information, the processor 160 will recognize the SA part and the corresponding data part as the free resource area (for example, information The field is indicated by "00"). For the decodable resource area in the busy resource area, if the signal strength of the SA part is greater than a preset threshold, and the processor 160 can decode the T-RPT information, the processor 160 will consider the SA part and the corresponding data part to be decodable. Decode resource area (for example, represented by "01"). For the collision resource area in the busy resource area, if the intensity of the SA part signal is greater than a preset threshold, and the processor 160 cannot decode the T-RPT information, the processor 160 will consider the SA part and the data part to be collision resources. Zone (for example, represented by "10").

On the other hand, if the resource positions of the SA part and the data part shown in FIG. 8A are not configured in advance (that is, the positions of the resources of the SA part and the data part corresponding to each user equipment are not fixed and are Other user equipments are not known in advance), the idle resource area, the decodable resource area and the collision resource area are determined as described below. Regarding the free resource area, it is different from the embodiment in which the foregoing location is configured in advance, in that only the SA part is determined as the free resource area. The decodable resource area in the busy resource area is the same as the embodiment in which the foregoing location has been configured in advance. Regarding the collision resource area in the busy area, the difference from the embodiment in which the position is configured in advance is that only the SA portion is determined as the collision resource area.

In another embodiment for resource sensing, the process is divided into two phases, one is based on Subchannel resources, and the other is based on Resource Block Group (RBG). For the first stage of resource sensing based on sub-channel resources, firstly, each selected carrier component resource is divided into multiple sub-channel resources by time and / or frequency. The size of the sub-channel resources is set by the upper layer and includes at least A resource block group. The processor 160 receives and measures the signal strengths of all sub-channel resources in the selected component carriers through the receiver 120, and according to a first energy threshold (can be determined in advance or dynamically adjusted, and based on the average of background noise) Power) determines the usage of all sub-channel resources in each component carrier that is selected for use. In response to measuring the energy (average or a certain section) of a sub-channel resource in a component carrier selected for use not exceeding this energy threshold, the processor 160 determines that the sub-channel resource is an idle sub-channel resource, The idle subchannel resource is a candidate resource for resource selection. In response to the energy measured for the sub-channel resource being greater than the energy threshold, the processor 160 determines that the sub-channel resource is not an idle sub-channel resource (but a busy sub-channel resource). As shown in FIG. 8C, all resources R can be divided into busy subchannel resources and idle subchannel resources. In addition, each sub-channel resource can be distinguished by different location information (the coordinates are taken as an example in the figure, (1,1) represents the sub-channel 1 of the sub-frame 1) and its resource location.

For the second stage resource sensing based on the resource block group, in order to provide more accurate sensing, the processor 160 further determines the busy sub-channel resources determined in the first stage (for example, the busy resources shown in FIG. 8C) It is divided into several resource block groups by time and / or frequency, the number of which is set by the upper layer. The processor 160 then receives and measures the signal strength of all resource block groups in each busy sub-channel resource through the receiver 120, and determines all resource block groups in each busy sub-channel resource according to another first energy threshold. Usage. In response to measuring the energy (average or a certain section) of a resource block group in a busy subchannel resource not exceeding the energy threshold, the processor 160 determines that the resource block group is an idle resource Block group. In response to the energy measured for the resource block group being greater than the energy threshold, the processor 160 determines that the resource block group is not an idle resource block group (but a busy resource block group).

Taking FIG. 8D as an example, a busy subchannel resource can be divided into four resource block groups 1 to 4. The processor 160 determines whether the four resource block groups 1 to 4 are busy or idle resource block groups based on another first energy threshold, and determines that the resource block group 1 is an idle resource block group Idle resource block group (IRBG) (corresponding to idle resources) and resource block groups 2 to 4 are busy resource block groups (BRBG) (corresponding to busy resources).

In an embodiment, for busy resources, the processor 160 may further determine the busy resource block based on a second energy threshold (which may be determined in advance or dynamically adjusted and based on the energy threshold used in the SA decoding process). The group is a decodable resource area or a collision resource area. In response to the measured energy (average or a certain section) of a busy resource block group not being greater than the second energy threshold, the processor 160 determines that the busy resource block group is a decodable resource area. In response to the energy measured for the resource block group being greater than the energy threshold, the processor 160 determines that the busy resource block group is a collision resource area.

In another embodiment for resource sensing, the processor 160 may also combine the foregoing resource sensing method based on the resource occupancy information and the two-stage energy measurement, and provide an indication of resource usage (including whether the resource is occupied, Decodable or idle, etc.) are compared with the weight coefficients (for example, determining whether the results obtained by the two methods are the same), so as to obtain a more reliable and accurate mixed resource indication. For example, in the case where the resource locations of the SA part and the data part have been configured in advance, the resource usage instruction obtained by using the resource occupancy information method will give a higher weight coefficient to the decodable resource area and the collision resource area. In the case where the resource locations of the SA part and the data part are not configured in advance, the resource usage instruction obtained by using the resource occupation information method will only give higher weight coefficients to the decodable resource area.

The resource pool of each component carrier selected for use can be distinguished based on PPPP. In one embodiment, the processor 160 may divide the resource pool (RP) (for example, the resource R in FIGS. 8B and 8C) corresponding to the component carriers selected for use into the same equal division or different proportions according to PPPP. FIG. 9A and FIG. 9B are schematic diagrams illustrating resource pool division in two examples. Please refer to FIG. 9A first. Assume that there are first PPPP to fourth PPPP (that is, PPPP1 to PPPP4), and the processor 160 divides the resource pool RP into four equal divisions, and the four divisions are assigned to the 4 Different PPPP user equipments 100 are used. That is, the user equipment 100 only performs resource sensing and selection from the resource portion corresponding to its PPPP.

In another embodiment, the processor 160 may divide the resource pool (for example, resource R of FIGS. 8B and 8C) corresponding to each component carrier selected for use according to the channel usage threshold corresponding to PPPP into different proportions according to PPPP. Referring to FIG. 9B, it is assumed that there are first PPPP to fourth PPPP (that is, PPPP1 to PPPP4), and the corresponding channel use threshold ratio is 0.2: 0.4: 0.6: 0.8. The processor 160 divides the resource pool RP into four resource areas according to the ratio of 1: 2: 3: 4, and assigns them to PPPP1 ~ PPPP4, respectively. In other words, the four resource areas are respectively allocated to the user equipment 100 with the four different PPPPs. That is, the user equipment 100 only performs resource sensing and selection from the resource area corresponding to its PPPP.

For resource selection, the processor 160 may sequentially assign a corresponding location number to each resource unit in each selected component carrier, wherein the size of the resource unit is set by an upper layer and includes at least one resource block. 10A and 10B are schematic diagrams illustrating resource selection and resource reselection according to an example. Please refer to FIG. 10A first, here it is assumed that the resource unit includes a resource block, and each resource block in the resource pool RP2 has a corresponding location number that is set in advance and known to all user equipment, and the location numbers are continuous and not repeat. The processor 160 can obtain a resource location corresponding to a busy resource block (BRB) after performing resource sensing (the corresponding set of busy resource location numbers is {1, 2, 5, 12, 13, 14, 14 , 26}) and the resource location corresponding to the Idle Resource Block (IRB) (the corresponding set of idle resource location numbers is {3, 4, 6, 7, 8, 9, 10, 11, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28, 29, 30}).

The processor 160 randomly performs initial resource selection on an idle resource block (for example, the idle resource block IRB in FIG. 10A) corresponding to one of the position numbers of the corresponding idle resource blocks. For example, the processor 160 selects a location number from the above set of idle resource location numbers, performs data transmission in the idle resource block corresponding to the location number, and then determines whether the selected resources collide (step S715). In response to the collision of the selected resources not occurring, the processor 160 will periodically and continuously use the selected corresponding resources for data transmission in a semi-persistent schedule (step S730). Taking FIG. 10B as an example, a non-collided resource block (NCRB) is only selected by a single user equipment 100, and the user equipment 100 selecting these non-collised resource blocks NCRB can continue to use the institute. Select the corresponding resource for data transmission.

In response to the collision of the selected resources, the processor 160 determines the resource selection of all idle resources or all collision resources that are subsequently sensed according to the size of the position number corresponding to the resource selection. The collision resource indicates that they are selected at the same time when at least two user equipments 100 perform resource selection. Taking FIG. 10B as an example, a collided resource block (CRB) is selected by two or more user equipments 100 simultaneously. In an embodiment, the user equipments 100 that have encountered the resource selection collision will re-sense the resources during the subsequent sensing window process, and judge the resources again as busy resource blocks, free resource blocks, and collision resources. One of the blocks, and determine the number of user equipments 100 in each collision resource block that have selected this resource block at the same time. Then, the user equipments 100 that have encountered the resource selection collision will perform resource reselection. The user equipment 100 that encountered a resource selection collision with a smaller position number in the previous resource selection will perform the above resource selection on all collision resource blocks again, that is, the position numbers of these corresponding collision resource blocks are randomly selected. The collision resource block corresponding to one of the resources is selected. On the other hand, the user equipment 100 that encountered a resource selection collision with a larger location number in the previous resource selection or the new user equipment 100 that made the resource selection for the first time will perform the above resource selection on all free resource blocks. Without performing the above-mentioned resource selection on all collision resource blocks, it is a random selection of the resource blocks corresponding to one of the position numbers of the corresponding free resource blocks. In this way, different types of user equipment 100 are distributed to select different types of resource blocks to reduce the probability of resource selection collisions and improve their reliability.

Taking FIG. 10B as an example, it is assumed that two user equipments 100 collided at a resource block with a location number of 17 in the previous resource selection, and the other two user equipments 100 had a location number of 19 in the previous resource selection. The resource block collided, and the three user devices 100 collided at the resource block with the previous resource selection location number 27, and the three user devices 100 collided at the previous resource with the location number selected 29 resource blocks collided. Next, at the next resource selection period, two persons at the previous resource selection location number 17 (its position number is less than the position numbers 19, 27, and 29 corresponding to the other three collision resource blocks mentioned above) encountered a resource selection collision Of the user equipment 100 will be randomly selected from all collision resource blocks whose location numbers are 17, 19, 27, 29 corresponding to all collision resource blocks, and the remaining eight user equipment 100 encountering a resource selection collision Then randomly select from all the free resource blocks whose position numbers corresponding to all the free resource blocks are 3, 4, 6, 10, 11, 15, 16, 20, 21, 25, 30.

It should be noted that the aforementioned determination of whether the position number is larger or smaller is based on the position number threshold, and this number threshold is related to the number of all free or collision resource blocks to be selected (for example, in the above example, The position number threshold value is half the number of all collision resource blocks, so the position number threshold value is 2, and the first two digits that have the smallest corresponding position number to encounter a resource selection collision will be removed from all collision resource blocks. The corresponding position numbers are randomly selected from all (4) collision resource blocks of 17, 19, 27, and 29). In addition, in other embodiments, the user equipment 100 with a smaller location number may also randomly select an idle resource, and the user equipment 100 with a larger location number may randomly select a collision resource.

In addition to reselecting the resources of the component carriers used in the same selection, the number of collisions in response to selecting resources from a component carrier used in a first selection exceeds a threshold (for example, 3, 5, or 7 times), and processing The device 160 performs resource sensing and selection on another newly selected component carrier different from the first selected component carrier (step S750), and performs resource sensing and selection on the first selected component carrier used by the resource. The selection will stop, in which the other newly selected component carrier is selected from the component carriers with the highest priority among the other candidate component carriers. Taking FIG. 6 as an example, the user equipment 100 originally selects the first and second component carriers from the four candidate component carriers as the component carriers to be selected for use. However, for example, when the user equipment 100 selects a resource on the second component carrier and the number of collisions exceeds a threshold (for example, 5 times), the user equipment 100 selects from other candidate component carriers according to the priority order. The one with the highest priority (for example, the third component carrier) is used as a new component carrier to be selected for resource sensing and selection.

In summary, the user equipment and resource sensing and selection method according to the embodiments of the present invention propose an improvement scheme for V2X mode 4. The user equipment consults the upper-layer set channel usage threshold value-PPPP mapping table based on its PPPP to obtain the component carrier corresponding to its PPPP and its channel usage threshold value, and will measure the channel usage measurement value from the corresponding component carrier measurement Compare it with the threshold value of the corresponding channel to get the candidate component carrier. Then, according to the capability of the user equipment and the priority order of the component carriers, at least one component carrier selected for use is selected from the candidate component carriers, and resource sensing and selection are performed on the selected component carriers simultaneously. For resource sensing, resource location information of busy resources and idle resources can be obtained based on resource occupancy information, energy measurement, or a combination thereof. With regard to resource selection, if the selection result encounters a resource selection collision, the subsequent resource selection will be determined based on the position number of the previous resource selection to perform resource selection on all idle resources or all collision resources.

Although the present invention has been disclosed as above with the examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some modifications and retouching without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

100, 100’‧‧‧ user equipment

110‧‧‧antenna

120‧‧‧ Receiver

130‧‧‧ transmitter

140‧‧‧ Digital to Analog and Analog to Digital Converter

150‧‧‧Storage

160‧‧‧Processor

S310 ~ S350, S710 ~ S750‧‧‧step

SW‧‧‧Sensing window

MP1 ~ MP4‧‧‧Measurement period

161‧‧‧ entity layer

163‧‧‧ Upper Level

R‧‧‧ resources

RU‧‧‧Resource Unit

RB‧‧‧Resource Block

BRB‧‧‧ Busy Resource Block

IRB‧‧‧Free Resource Block

BRBG ‧‧‧ Busy Resource Block Group

IRBG‧‧‧Free Resource Block Group

RP, RP2‧‧‧ resource pool

NCRB‧‧‧Non-collision resource block

CRB‧‧‧ Collision Resource Block

FIG. 1 is a schematic diagram of a resource sensing and selection window. FIG. 2 is a block diagram illustrating components of a user equipment according to an embodiment of the present invention. FIG. 3 is a flowchart illustrating a resource sensing and selection method according to an embodiment of the present invention. 4A and 4B are schematic diagrams illustrating resource sensing in two examples. FIG. 5 is a schematic diagram illustrating information exchanged at different layers according to an embodiment of the present invention. FIG. 6 is a schematic diagram illustrating selection of a component carrier to be selected for use according to an embodiment of the present invention. FIG. 7 is a flowchart illustrating resource sensing and selection of component carriers to be selected for use according to an embodiment of the present invention. 8A to 8D are schematic diagrams illustrating resource sensing according to an embodiment of the present invention. FIG. 9A and FIG. 9B are schematic diagrams illustrating resource pool division in two examples. 10A and 10B are schematic diagrams illustrating resource selection and resource reselection according to an example.

Claims (50)

A resource sensing and selection method is applicable to a user equipment (UE). The resource sensing and selection method includes: measuring and obtaining channel usage of all component carriers (CCs); according to the The measurement values of the channel usage of the component carriers and the ProSe Per-packet Priority (PPPP) corresponding to the user equipment are used to determine candidate component carriers from the component carriers. The number is an integer greater than or equal to zero; and selecting at least one of the candidate constituent carriers as a constituent carrier to be used and performing resource sensing and selection on the at least one constituent carrier to be used. The resource sensing and selection method according to item 1 of the scope of the patent application, wherein the steps of determining the candidate component carriers include: comparing channel usage measurements of each component carrier and each corresponding component carrier The channel usage threshold value corresponding to the individual packet priority of the corresponding proximity service is used; the channel usage measurement value of a first component carrier among the component carriers is less than the corresponding channel usage threshold value, and the first A component carrier is used as one of the candidate component carriers; and the channel usage measurement value of the first component carrier is not less than the corresponding channel usage threshold value, and the first component carrier is not used as the candidates. One of the carriers. The resource sensing and selection method according to item 2 of the scope of patent application, wherein the channel usage measurement value of each component carrier and each corresponding component carrier's individual packet priority in the corresponding proximity service are compared. The steps of the corresponding channel usage threshold value include: obtaining a channel usage threshold value-proximity service individual packet priority mapping table, wherein the channel usage threshold value-proximity service individual packet priority mapping table records all constituent carriers in all correspondences All channel usage thresholds corresponding to the individual packet priority of the proximity service; and the channel usage measurement value and the channel usage threshold value of the user equipment of the proximity service individual packet priority for each of the constituent carriers- In the proximity service individual packet priority mapping table, the corresponding proximity service individual packet priority is compared using a threshold value on each channel corresponding to the corresponding component carrier. The resource sensing and selection method as described in item 3 of the scope of the patent application, wherein the channel uses a threshold-proximity service individual packet priority mapping table for all of the proximity service individual packet priorities including their corresponding index basis A priority order. The resource sensing and selection method as described in item 4 of the scope of the patent application, wherein the channel uses a threshold-proximity service individual packet priority mapping table to record all the component carriers corresponding to the individual packet priority of the proximity services. The number is that the number of component carriers corresponding to the higher priority of the individual packet priority of the proximity service is greater than or equal to the number of component carriers corresponding to the lower priority of the individual packet priority of the proximity service. The resource sensing and selection method according to item 4 of the scope of the patent application, wherein the channel uses the threshold-proximity service individual packet priority mapping table to record the corresponding components of each of the proximity service individual packet priorities. The carriers include their corresponding indexes arranged according to a priority order. The resource sensing and selection method according to item 6 of the scope of patent application, wherein the channel uses the threshold-proximity service individual packet priority mapping table to record the corresponding components of each of the proximity service individual packet priorities. The priority order of the constituent carriers in the carriers including their corresponding indexes is that the index of the constituent carrier with the higher priority is less than or equal to the index of the constituent carrier with the lower priority; and all the neighboring services The index of the former of the constituent carriers corresponding to the individual packet priority is that the index of the former of the constituent carriers corresponding to the higher priority of the individual packet priority of the proximity service is less than or equal to The lower the priority of the packet priority of the proximity service, the lower the corresponding index of the former of the component carriers. The resource sensing and selection method according to item 4 of the scope of the patent application, wherein the channel uses a threshold-proximity service individual packet priority mapping table to record all the corresponding different proximity services in each of the component carriers. The channel usage thresholds corresponding to individual packet priorities are different. The resource sensing and selection method according to item 3 of the scope of the patent application, wherein the channel uses a threshold-proximity service individual packet priority mapping table for each of the proximity service individual packet priorities in all the corresponding ones. The thresholds for the channels corresponding to different component carriers are different. The resource sensing and selection method according to item 8 of the scope of the patent application, wherein the channel uses a threshold-proximity service individual packet priority mapping table for each of the neighboring service individual packet priorities in the corresponding all of these. The channel usage threshold corresponding to the component carrier is that the channel usage threshold corresponding to the smaller component carrier index is greater than the channel usage threshold corresponding to the larger component carrier index. According to the resource sensing and selection method described in item 3 of the scope of patent application, a channel corresponding to a first resource selection window uses a threshold-proximity service individual packet priority mapping table corresponding to a channel corresponding to the component carrier The usage threshold value is greater than the channel usage threshold value corresponding to a second resource selection window-the channel usage threshold value corresponding to the same carrier recorded in the proximity service individual packet priority mapping table, wherein the time length of the first resource selection window Less than the duration of the second resource selection window. The resource sensing and selection method according to item 3 of the scope of the patent application, wherein the channel uses a threshold-proximity service individual packet priority mapping table for all of the proximity service individual packet priorities corresponding to at least one service type , And the priority order of the at least one service type is the same. According to the resource sensing and selection method described in item 2 of the scope of the patent application, wherein the measurement value of each channel usage condition is a Channel Busy Ratio (CBR) value. According to the resource sensing and selection method described in item 1 of the scope of the patent application, wherein the steps of obtaining the channel usage measurement values of all of the constituent carriers include: dividing a sensing window by at least one measurement period; and measuring Measure and obtain channel use measurement values of all the component carriers in the at least one measurement period. According to the resource sensing and selection method described in item 1 of the patent application scope, wherein the step of selecting at least one of the candidate component carriers as a component carrier for selection includes: according to the priority order of the candidate component carriers and the The capability of the user equipment, and at least one of the candidate component carriers is selected as a component carrier to be used; and resource sensing and selection are performed on the at least one component carrier to be used. According to the resource sensing and selection method described in item 1 of the scope of the patent application, wherein the step of performing resource sensing and selection on the at least one selected component carrier includes: time-consuming each resource of the selected component carrier in time. And / or frequency division into multiple resource units, where the size of the resource unit is set by the upper layer and includes at least one resource block; and at least one idle resource unit in each of the selected component carriers is determined according to a resource occupation information , Wherein the resource occupation information is related to a resource allocation situation of data transmission, and the at least one idle resource unit is a candidate resource for resource selection. The resource sensing and selection method according to item 16 of the scope of the patent application, wherein determining the at least one idle resource unit in each of the selected component carriers according to the resource occupation information includes: from at least one scheduling assignment (Scheduling Assignment (SA) message to obtain the resource occupation information. According to the resource sensing and selection method described in item 1 of the scope of the patent application, wherein the step of performing resource sensing and selection on the at least one selected component carrier includes: time-consuming each resource of the selected component carrier in time. And / or frequency division into a plurality of sub-channel resources, wherein the size of the sub-channel resources includes at least one resource block group; the usage of each of the sub-channel resources in each of the selected component carriers is determined according to an energy threshold value Responding to measuring the energy of a first sub-channel resource in the selected component carrier that is not greater than the energy threshold, determining that the first sub-channel resource is an idle sub-channel resource, where the idle sub-channel resource is Candidate resources for resource selection; and in response to the energy measured for the first sub-channel resource being greater than the energy threshold, determining that the first sub-channel resource is a busy sub-channel resource. According to the resource sensing and selection method described in item 18 of the scope of patent application, wherein the step of performing resource sensing and selection on the at least one selected component carrier includes: determining each of each of the selected component carriers. The busy sub-channel resource; dividing each busy sub-channel resource into multiple resource block groups in time and / or frequency; determining the usage of each resource block group according to an energy threshold; The energy measured for a first resource block group in a busy sub-channel resource is not greater than the energy threshold, it is determined that the first resource block group is an idle resource block group, and the idle resource area The block group is a candidate resource for resource selection; and in response to the energy measured for the first resource block group being greater than the energy threshold, it is determined that the first resource block group is not the idle resource area. Block group. According to the resource sensing and selection method described in item 1 of the scope of patent application, wherein the step of performing resource sensing and selection on the at least one selected component carrier includes: according to a previous information, each of the selected component carriers is used. The idle resources in the resource are reselected, wherein the previous information is based on a resource selection result of a component carrier used previously for each of the selections, and the resource selection result is related to a resource selection collision. According to the resource sensing and selection method described in claim 20, wherein the step of performing resource sensing and selection on the at least one selected component carrier includes: each of the at least one selected component carrier. The resource unit sequentially assigns corresponding location numbers, where the size of the resource unit is set by the upper layer to include at least one resource block; and the idle resource unit corresponding to one of the location numbers of the corresponding idle resource unit is randomly performed for the first time Resource selection. The resource sensing and selection method as described in item 20 of the scope of the patent application, which further includes: in response to the initial resource selection or the resource reselection, a resource selection collision does not occur, and the initial resource selection or the resource re-use is continued. Selecting the corresponding resource for data transmission; and in response to the initial resource selection or the resource reselection corresponding to the resource selection collision of the resource selection, the subsequent sensing is determined according to the size of the initial resource selection or the resource reselection corresponding to the location number All idle resources or all collision resources are used for resource selection, where the collision resource indicates that the resource unit is selected at the same time when at least two of the user equipments perform resource selection. According to the resource sensing and selection method described in item 1 of the scope of the patent application, the resource sensing and selection method for the at least one component carrier selected for use includes: the resource pool basis corresponding to the at least one component carrier used for selection The individual packets of the corresponding neighboring services are divided into the same equal priority or different proportions. The resource sensing and selection method according to item 1 of the scope of patent application, wherein the resource sensing and selection method for the at least one component carrier selected for use includes: responding to one of the component carriers selected for use from the at least one component carrier. The first selected component carrier selects resources and the number of collisions exceeds a threshold. A new candidate component carrier with the highest priority is selected as the newly selected component carrier and the selected component carrier is used. Resource sensing and selection. According to the resource sensing and selection method described in item 1 of the scope of the patent application, the user equipment is suitable for Vehicle-to-Everything (V2X) mode four. A user equipment includes: a receiver that receives a signal; a transmitter that transmits a signal; a processor that is coupled to the receiver and the transmitter, and is configured to: obtain by measurement through the receiver Channel usage of all component carriers; candidate component carriers are determined from the component carriers based on the channel usage measurements of the component carriers and the priority of individual packets corresponding to the proximity services of the user equipment. The number is an integer greater than or equal to zero; and selecting at least one of the candidate constituent carriers as a constituent carrier to be used and performing resource sensing and selection on the at least one constituent carrier through the receiver. The user equipment as described in claim 26, wherein the processor is configured to: compare a channel usage measurement value of each component carrier with each corresponding component carrier in the corresponding neighborhood The channel usage threshold corresponding to serving individual packet priorities; the channel usage measurement value corresponding to a first component carrier among the component carriers is smaller than the corresponding channel usage threshold, and the first component carrier is used as the One of the candidate component carriers; and the channel usage measurement value that is responsive to the first component carrier is not less than the corresponding channel usage threshold, and the first component carrier is not used as one of the candidate component carriers By. The user equipment as described in claim 27, wherein the processor is configured to: obtain a channel usage threshold value-proximity service individual packet priority mapping table, wherein the channel usage threshold value-proximity service individual The packet priority mapping table records all channel usage thresholds corresponding to the individual packet priorities of all corresponding carrier services in all corresponding proximity services; and the user equipment of the individual service packet priorities of the proximity services in each of the constituent carriers. The channel usage measurement value is compared with the channel usage threshold value-proximity service individual packet priority mapping table for the corresponding proximity service individual packet priority in the channel usage threshold value corresponding to each corresponding component carrier. The user equipment according to item 28 of the scope of patent application, wherein the channel uses a threshold-proximity service individual packet priority mapping table records all the proximity service individual packet priorities including their corresponding indexes according to a priority order arrangement. The user equipment according to item 29 of the scope of patent application, wherein the channel usage threshold-proximity service individual packet priority mapping table records the number of component carriers corresponding to all the proximate service individual packet priorities, The higher the priority of the individual packet priority of the proximity service, the corresponding the number of component carriers is greater than or equal to the lower the priority of the individual packet priority of the proximity service, the corresponding the number of component carriers. The user equipment as described in claim 29, wherein the channel use threshold-proximity service individual packet priority mapping table records each component carrier corresponding to each of the proximity service individual packet priorities including its The corresponding indexes are arranged according to a priority order. The user equipment according to item 31 of the scope of patent application, wherein the channel uses the threshold-proximity service individual packet priority mapping table in each of the constituent carriers corresponding to each of the proximity service individual packet priorities. The priority order of the constituent carriers including their corresponding indexes is that the index of the constituent carrier with the higher priority is less than or equal to the index of the constituent carrier with the lower priority; and the individual packets of all the neighboring services have priority. The index of the former order of the constituent carriers corresponding to the weight is that the index of the first order of the constituent carriers corresponding to the higher priority of individual packets of the proximity service is less than or equal to the proximity service. The lower the priority of the individual packet priority, the lower the corresponding index of the former of the component carriers. The user equipment as described in claim 29, wherein the channel uses a threshold-proximity service individual packet priority mapping table and records all the corresponding different proximity service individual packets in each of the constituent carriers. The thresholds for channel usage are different. The user equipment as described in claim 28, wherein the channel uses a threshold-proximity service individual packet priority mapping table for each of the proximity service individual packet priorities in all the corresponding different constituent carriers. Corresponding channels use different thresholds. The user equipment as described in claim 33, wherein the channel uses a threshold-proximity service individual packet priority mapping table for each of the proximity service individual packet priorities in all corresponding component carriers. The corresponding channel usage threshold is that the channel usage threshold corresponding to the smaller index of the component carrier is greater than the channel usage threshold corresponding to the larger index of the component carrier. The user equipment according to item 28 of the scope of patent application, wherein a channel usage threshold value corresponding to a first resource selection window-the channel usage threshold value corresponding to the component carrier recorded in the proximity service individual packet priority mapping table is greater than Channel usage threshold value corresponding to a second resource selection window-the channel usage threshold value corresponding to the same component carrier recorded in the proximity service individual packet priority mapping table, wherein the time length of the first resource selection window is less than the second resource Select the duration of the window. The user equipment according to item 28 of the scope of patent application, wherein the channel uses a threshold-proximity service individual packet priority mapping table records all the neighboring service individual packet priorities corresponding to at least one service type, and the The priority of at least one service type is the same. The user equipment according to item 27 of the scope of patent application, wherein the measured value of each channel usage is a channel busy rate value. The user equipment as described in claim 26, wherein the processor is configured to: divide a sensing window by at least one measurement cycle; and obtain the at least one quantity through measurement by the receiver. Measurements of the channel usage of all the constituent carriers in the measurement period. The user equipment as described in claim 26, wherein the processor is configured to: select from the candidate component carriers according to the priority order of the candidate component carriers and the capability of the user equipment. At least one of the selected component carriers is used; and resource sensing and selection of the at least one selected component carrier is performed. The user equipment according to item 26 of the patent application scope, wherein the processor is configured to: divide each of the resources constituting the carrier to be selected into a plurality of resource units in time and / or frequency, where the The resource unit size is set by the upper layer and includes at least one resource block; at least one idle resource unit in each of the selected component carriers is determined according to a resource occupation information, wherein the resource occupation information is related to the resource allocation situation of data transmission And the at least one idle resource unit is a candidate resource for resource selection. The user equipment as described in claim 41, wherein the processor is configured to: obtain the resource occupation information from at least one scheduling assignment message through the receiver. The user equipment according to item 26 of the scope of patent application, wherein the processor is configured to: divide each of the selected constituent carrier resources into time and / or frequency into a plurality of sub-channel resources, wherein the The sub-channel resource size includes at least one resource block group; the usage of each of the sub-channel resources in each of the component carriers selected for use is determined according to an energy threshold; The energy measured by the first sub-channel resource is not greater than the energy threshold, determining that the first sub-channel resource is an idle sub-channel resource, wherein the idle sub-channel resource is a candidate resource for resource selection; and The energy measured by the first sub-channel resource is greater than the energy threshold, and it is determined that the first sub-channel resource is a busy sub-channel resource. The user equipment according to item 43 of the scope of patent application, wherein the processor is configured to: determine each busy subchannel resource in each component carrier selected for use; and each busy subchannel The resource is divided into multiple resource block groups by time and / or frequency; the usage of each resource block group is determined according to an energy threshold; and a response to a first resource region of a busy subchannel resource The energy measured by the block group is not greater than the energy threshold, and it is determined that the first resource block group is an idle resource block group, where the idle resource block group is a candidate resource for resource selection; And in response to the energy measured for the first resource block group being greater than the energy threshold, it is determined that the first resource block group is not the idle resource block group. The user equipment according to item 26 of the patent application scope, wherein the processor is configured to: perform resource reselection on idle resources in each of the selected component carriers according to a previous information, wherein the previous information It is based on a resource selection result previously used for each component carrier used for the selection, and the resource selection result is related to a resource selection collision. The user equipment according to item 45 of the patent application scope, wherein the processor is configured to: sequentially assign a corresponding location number to each resource unit in the at least one selected component carrier, where the resource The unit size is set by the upper layer to include at least one resource block; and the initial resource selection is performed randomly for the idle resource unit corresponding to one of the position numbers of the corresponding idle resource units. The user equipment according to item 45 of the scope of patent application, wherein the processor is configured to: in response to the initial resource selection or the resource reselection, a resource selection collision does not occur, and the initial resource selection is continuously used. Or the resource reselects the corresponding resource for data transmission; and the resource selection collision occurs in response to the initial resource selection or the resource corresponding to the resource reselection, and is determined based on the size of the corresponding location number for the initial resource selection or the resource reselection All subsequent idle resources or all collision resources are selected, where the collision resource indicates that the resource unit is selected at the same time when at least two of the user equipments perform resource selection. The user equipment as described in claim 26, wherein the processor is configured to: divide the resource pool corresponding to the at least one selected component carrier into the same according to the priority of individual packets of the proximity services, etc. Points or different proportions. The user equipment as described in claim 26, wherein the processor is configured to: collide in response to selecting a component carrier resource selected from a first selected component carrier among the at least one selected component carrier for collision The number of times exceeds the threshold of one time, and a candidate carrier with the highest priority among other candidate constituent carriers is selected again as a newly selected constituent carrier, and resource sensing and selection are performed on the selected constituent carrier. The user equipment as described in item 26 of the scope of patent application, which is applicable to the connected vehicle communication mode four.