TWI682673B - User equipment and resource sensing and selection method thereof - Google Patents

Abstract

A user equipment (UE) and a resource sensing and selection method thereof 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 resource sensing and selection method

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

The Third Generation Partnership Project (3GPP) creates 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, to communicate with other vehicles, transportation infrastructure and users. In addition, the C-V2X architecture 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. The device-to-device PC5 interface (PC5 Interface) is used to enhance a technology for direct connection and communication between two vehicles.

Carrier Aggregation (CA) and reduction of physical layer (Carrier Aggregation, CA) in the discussion topics of 3GPP V2X Phase 2 Study Item and Work Item of Release 15 (Release 15) Arrival and resource selection maximum latency (Latency) and other two PC5 function issues are proposed as targets, and these two issues will be able to match the resource pool (Resource Pool) and scheduling assignment (Scheduling Assignment) defined in version 14 , SA) format coexistence. Among them, in order to reduce the delay time of the physical layer, the 3GPP standard meeting has reached a conclusion that the resource selection window is reduced (ie, the T2 parameter is reduced). FIG. 1 is a schematic diagram of the 14th version of the resource sensing and selection window. Please refer to FIG. 1, the parameter T2 of the original resource selection (reselection) window duration is between 20 and 100 milliseconds (ms), so its reduction may make the value less than 20 ms. As shown in Figure 1, n is the time reference point, and n+T1~n+T2 is the time range 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 chance that different user equipments (User Equipment, UE) select the same resource (ie, collision). Using carrier aggregation can add multiple component carriers (Component Carriers, CCs) to alleviate the above-mentioned resource selection collision problem. However, in the context of carrier aggregation, how to enable more user equipment without the assistance of a base station (that is, V2X Mode 4) is one of the main problems. From this, it can be seen that solutions to the problems of carrier aggregation and resource selection window reduction will require solutions.

The invention provides a user equipment and its resource sensing and selection method.

In an embodiment of the present invention, the resource sensing and selection method of the present invention is applicable to user equipment (User Equipment, UE), and the resource sensing and selection method thereof includes the following steps. Measure and obtain the channel usage of all multiple component carriers (CCs). Based on the channel usage measurements of these component carriers and the ProSe Per-Packet Priority (PPPP) of the proximity service corresponding to this user equipment, several candidate component carriers are determined from those component carriers. Selecting at least one of these candidate component carriers is to select the component carrier to use and perform resource sensing and selection.

In an embodiment of the invention, the user equipment includes at least but not limited to a receiver, a transmitter and a processor. The receiver is used to receive signals. The transmitter is used to transmit signals. The processor is coupled to the receiver and the transmitter. The processor is also configured to perform the following steps. Through the receiver, the channel usage of all multiple component carriers is obtained through measurement. Based on the channel usage measurements of these component carriers and the individual packet priority of the proximity service corresponding to this user equipment, several candidate component carriers are determined from those component carriers. At least one of these candidate component carriers is selected as the component carrier selected for use, and the receiver is used for resource sensing and selection of the component carrier selected for use.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below in conjunction with the accompanying drawings for detailed description as follows.

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 ‧‧‧ steps

SW‧‧‧sensor window

MP1~MP4‧‧‧‧Measurement period

161‧‧‧ physical layer

163‧‧‧Upper

R‧‧‧Resources

RU‧‧‧ Resource Unit

RB‧‧‧Resource Block

BRB‧‧‧Busy resource block

IRB‧‧‧Idle 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.

2 is a block diagram of components of a user equipment according to an embodiment of the invention.

FIG. 3 is a flowchart illustrating a resource sensing and selection method according to an embodiment of the invention.

4A and 4B are schematic diagrams illustrating resource sensing by two examples.

5 is a schematic diagram illustrating the exchange of information between different layers according to an embodiment of the invention.

FIG. 6 is a schematic diagram illustrating selection of component carriers to be used according to an embodiment of the present invention.

FIG. 7 is a flowchart illustrating resource selection and selection of a component carrier to be used according to an embodiment of the present invention.

8A to 8D are schematic diagrams illustrating resource sensing according to an embodiment of the invention.

FIG. 9A and FIG. 9B are schematic diagrams illustrating resource pool splitting by two examples.

10A and 10B are schematic diagrams illustrating resource selection and resource reselection.

FIG. 2 is a block diagram of components of the user equipment 100 according to an embodiment of the invention. Referring to FIG. 2, the user equipment 100 uses vehicle-to-everything (V2X) mode 4 (mode 4) (also may be vehicle-to-vehicle (V2V), device-to-device (V2V) Device-to-Device, D2D) and other two devices directly Communication technology), and can support carrier aggregation (Carrier Aggregation, CA) technology. The user equipment 100 may have various implementation forms, which may be a device or a device fixed on a movable vehicle (for example, a car, a locomotive, a bicycle, a ship, or an airplane, etc.), or a device on a movable vehicle ( For example, mobile phones, laptops, tablets or watches, 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 used to receive and transmit signals wirelessly through the antenna 110, respectively. The receiver 120 and the transmitter 130 may also perform analog signal processing operations such as low noise amplification, impedance matching, frequency mixing, up or down conversion, filtering, amplification, and the like. The analog-to-digital and digital-to-analog converter 140 is configured to convert the analog signal format to the digital signal format, and convert the digital signal format to the 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 the like Or a combination of the above elements. The storage 150 is used to store code, device configuration, codebook, buffered or permanent data (for example, channel usage threshold-proximity service individual packet priority (ProSe Per-packet Priority, PPPP) mapping table , The measured value of channel usage, user equipment capability information, resource occupancy information, energy threshold, previous information and other information, and its details will be explained later), And record such as the physical layer (Physical Layer), media access control (Media Access Control, MAC) layer, logical link control (Logical Link Control, LLC) layer, network service layer, upper layer and other various communication protocol related software Module.

The processor 160 is configured to process digital signals and execute a program according to an exemplary embodiment of the present invention, and can access or load data recorded in the storage 150 and software modules. 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, a field programmable logic gate array (Field Programmable Gate Array (FPGA) and other programmable units to implement. The function of the processor 160 can also be implemented by an independent electronic device or an integrated circuit (IC), and the operation of the processor 160 can also be implemented by software.

In order to facilitate understanding of the operation process of the embodiment of the present invention, a number of embodiments will be described in detail below to describe the operation process of the user equipment 100 in the embodiment of the present invention.

FIG. 3 is a flowchart illustrating a resource sensing and selection method according to an embodiment of the invention. Please refer to FIG. 3, the method of this embodiment is applicable to the user equipment 100 in FIG. 2. Hereinafter, the methods described in the embodiments of the present invention will be described in conjunction with various components and modules of the user equipment 100. The various processes of the method can be adjusted according to the implementation situation, and it is not limited to this.

The processor 160 measures and obtains channel usage of all component carriers through the receiver 120 (step S310). Specifically, the CA technology can simultaneously combine two or more continuous or discontinuous specific bandwidth (for example, 10, 20, or 50MHz) component carriers to increase the total bandwidth of data transmission, thereby increasing the transmission speed. And the user equipment 100 The increase in the number of selectable component carriers (for example, 3GPP V2X phase 2 Study Item/Work Item has defined that CA can use up to eight component carriers) will increase the available (radio) resources. If the resource selection of the user equipment 100 can be effectively scheduled, it will help to improve the transmission efficiency of the single user equipment or even the overall system. Among them, the channel usage can be information to assess whether the resource is occupied, busy, idle, and/or interference, and the measured values can be the channel busy ratio (CBR) value and 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 and other channels Use relevant values.

In an embodiment, the time for sensing the resources of each component carrier is related to a specific period (for example, the sensing window shown in FIG. 1 whose duration is 1000 milliseconds (ms)), and the processor 160 senses this The window or other period for resource sensing is divided by 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 component carriers in one or more measurement cycles through the measurement by the receiver 120.

4A and 4B are schematic diagrams illustrating resource sensing by 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. deal with The device 160 can randomly/arbitrarily or specifically select a certain measurement period MP1~MP4 (which can overlap or not overlap each other) within a sensing window SW of each component carrier, and select the measurement period MP1~MP4 in the process The CBR value is measured in the middle. The processor 160 can arbitrarily or specifically select one or more measured CBR values from these measurement periods MP1~MP4; if the processor 160 selects only 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, assuming 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 can equally divide each sensing window SW of each component carrier into different measurement periods MP1~MP4, and measure the CBR value during each measurement period MP1~MP4. For each measurement period MP1~MP4, the processor 160 will first obtain the average value of the corresponding CBR value. The processor 160 can randomly or specifically select the average value of one or more measured CBRs from these measurement periods MP1~MP4; if the processor 160 selects only one measurement period MP1, MP2, MP3 or MP4, then 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; and if the processor 160 self-measures the measurement period MP1, MP2, MP3 and MP4 If more than one is selected, the average value of the selected CBR will be averaged again (the selected measurement period corresponds to the average of the CBR and then divided by The number of selected measurement cycles is used as the measurement value of the rough estimation channel usage of the component carrier.

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

The processor 160 may determine several candidate component carriers from those component carriers based on the channel usage measurement values of all component carriers and the ProSe Per-Packet Priority (PPPP) of the proximity service corresponding to the user equipment 100 (Step S330). Specifically, the transmission between the two user devices 100 in V2X mode 4 is via the PC5 interface. According to the 3GPP TS 23.303 and TS 36.300 standards, when the ProSe upper layer performs protocol data unit transmission on the PC5 interface, the ProSe upper layer will provide PPPP information (from 8 possible values) Select from the range). The PPPP information is a quantitative value related to the protocol data unit, and it gives priority to the transmission of the protocol data unit. Each user equipment 100 is assigned a specific PPPP value, so that PC5-S messages or other protocol data units sent by each user equipment 100 can be given priority (for example, transmission with higher priority is given priority, (Subsequent processing of lower priority transmission).

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

In one embodiment, the processor 160 compares the channel usage measurement value of each component carrier with the channel usage threshold value of each component carrier corresponding to the PPPP corresponding to the user equipment 100 to determine whether the component carrier is busy Component carrier or idle component carrier. The channel usage threshold value is, for example, CBR threshold value, CR threshold value, signal-to-noise ratio threshold value, etc., and corresponds to the type of channel usage. Data transmission will be severely interfered when the carrier transmission is busy, and it may cause transmission failure or excessive failure. On the other hand, idle component carriers can be used as candidate component carriers, and the interference on data transmission thereon is lower than that on busy component carriers. In response to the channel usage measurement value of a certain component carrier among all component carriers being smaller than the corresponding channel usage threshold, the processor 160 uses this component carrier as a candidate component carrier. However, in response to the channel usage measurement value of this component carrier being not less than the corresponding channel usage threshold, the processor 160 does not (or prohibit\stop) this component carrier as a candidate component carrier. It can be seen from this that the decision of the channel usage threshold value may affect the decision of the candidate component carrier.

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

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

其中n ₁代表第一PPPP對應的組成載波個數，其餘依此類推。也就是說，PPPP之優先順序越高者可以被分配到更多個組成載波，以降低資源選擇碰撞機率並提高其可靠度(Reliability)。 In addition, each PPPP is assigned a specific number of component carriers. 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 (ie, the higher the priority), the number of component carriers is greater than Or equal to the lower the priority of PPPP (that is, the lower the priority), the number of component carriers is expressed mathematically as follows:

Where n ₁ represents the number of component carriers corresponding to the first PPPP, and so on for the rest. That is to say, the higher the priority of PPPP can be allocated to more component carriers to reduce the probability of resource selection collision and improve its reliability (Reliability).

CC2

‧‧‧

CCM。此外，此通道使用門檻值-PPPP映射表所記錄的每一PPPP對應的組成載波中排列順序最前者的索引是，PPPP之優先順序越高者之組成載波中排列順序最前者的索引小於或等於PPPP之優先順序越低者之組成載波中排列順序最前者的索引。其關係以數學表示如下：

其中l ₁代表第一PPPP對應的組成載波的索引偏位(其索引偏位值加一即為排列順序最前者的索引)，其餘依此類推。而針對第i PPPP(索引i是1到m之間的正整數)對應的組成載波之索引為l _i +k，其中k

{1,...,n _i }。例如，第一PPPP的組成載波個數為8，且對應到第一組成載波至第八組成載波，其中n ₁=8且l ₁=0(排列順序最前者的索引是l ₁+1=1)；第八PPPP的組成載波個數為1，且對應到第八組成載波，其中n ₈=1且l ₈=7(排列順序最前者的索引是l ₈+1=8)。也就是說，PPPP的優先順序越高者可能被分配到索引在排列順序中越前面的組成載波。綜上所述，利用PPPP的優先順序越高者分配到索引在排列順序中越前面的組成載波以及每一PPPP 對應的組成載波的優先順序，可以盡量分散各PPPP對應的組成載波的配置並協助使各PPPP盡量對應不同組成載波作為候選組成載波，以降低資源選擇碰撞機率並提高其可靠度。 In an embodiment, all component carriers corresponding to each PPPP recorded in the threshold-PPPP mapping table of the channel, including their corresponding indexes, are arranged according to the priority order. The priority order of the component carriers in the component carrier corresponding to each PPPP is that the index of the component carrier with the higher priority order is less than or equal to the index of the component carrier with the lower priority order. For example, the channel uses the 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 number between 1 and M Integer), the priority is CC1

CC2

‧‧‧

CCM. In addition, this channel uses the threshold-PPPP mapping table to record the index of the top-ranking order of the component carriers corresponding to each PPPP. The index of the top-ranking order of the component carriers with the higher PPPP priority is less than or equal to The index of the former order in the component carrier with the lower priority of PPPP. The relationship is expressed mathematically as follows:

Where l ₁ 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 order of arrangement), and the rest can be deduced by analogy. The index of the component carrier corresponding to the i-th PPPP (index i is a positive integer between 1 and m) is l _i + k , where k

{1,..., n _i }. For example, the number of component carriers of the first PPPP is 8, and corresponds to the first component carrier to the eighth component carrier, where n ₁ = 8 and l ₁ =0 (the index of the former ranking order is l ₁ +1=1 ); The number of component carriers of the eighth PPPP is 1, and corresponds to the eighth component carrier, where n ₈ =1 and l ₈ =7 (the index of the former in the order of arrangement is l ₈ +1=8). That is to say, the higher the priority of PPPP may be assigned to the component carrier whose index is earlier in the arrangement order. In summary, the higher the priority of PPPP is, the higher the priority is to be assigned to the component carrier whose index is higher in the sort order and the priority of the component carrier corresponding to each PPPP. Each PPPP corresponds to different component carriers as candidate component carriers as much as possible to reduce the probability of resource selection collision and improve its reliability.

其中

代表第i PPPP在第n _i 個組成載波的通道使用門檻值，其餘依此類推。例如，第一PPPP在對應第一組成載波的CBR門檻值為0.8，而在對應第二組成載波的CBR門檻值為0.75。也就是說，相同PPPP在對應組成載波的索引越前者所對應的通道使用門檻值越高。而若通道使用門檻值越低，則表示組成載波被決定為候選組成載波的機會越低。也就是說，基於此配置，若對各組成載波量測所得的通道使用量測值情況大致相同，則處理器160決定索引越前面(即，數值越小)的組成載波作為候選組成載波的機會比較高。如此可以協助使各PPPP盡量對應不同組成載波作為候選組成載波，以降低資源選擇碰撞機率並提高其可靠度。 In different embodiments, the channel usage threshold-PPPP mapping table records that each PPPP has a different channel usage threshold corresponding to different component carriers. In an embodiment, the threshold of channel usage in the component carrier corresponding to each PPPP is that the arrangement order is higher than the former (that is, the index value is smaller) than the arrangement order is the latter (that is, the index value is larger), Expressed mathematically as follows:

among them

Represents that the i th PPPP uses the threshold in the n _i component carrier channel, and so on. For example, the CBR threshold of the first PPPP corresponding to the first component carrier is 0.8, and the CBR threshold of the second component carrier is 0.75. That is to say, the higher the index of the corresponding PPPP in the corresponding component carrier, the higher the channel usage threshold corresponding to the former. If the channel usage threshold value is lower, it means that the component carrier is determined to be a candidate component carrier with a lower chance. That is to say, based on this configuration, if the channel usage measurement values obtained for each component carrier are approximately the same, the processor 160 determines the component carrier with the earlier index (that is, the smaller the value) as the candidate component carrier. Relatively high. In this way, it is possible to help each PPPP correspond to different component carriers as candidate component carriers as much as possible, so as to reduce the probability of resource selection collision and improve its reliability.

There may be more than one PPPP corresponding to any component carrier, and a single component carrier may correspond to a PPPP group including one or several PPPPs. Among all PPPPs of the same PPPP group, the number of corresponding component carriers and the index offset of the component carriers Numerical value Are all the same. In one embodiment, the channel usage threshold value-PPPP mapping table may record different channel usage threshold values corresponding to all corresponding PPPPs in each component carrier. 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 usage threshold corresponding to the resource selection window of different time lengths (as shown in FIG. 1, namely parameter T2)-the channel usage threshold recorded in the PPPP mapping table may be different, and the user equipment 100 is in this resource selection window Make resource selections. In an embodiment, assuming that the time length of the first resource selection window is less than the time length of the second resource selection window, the channel corresponding to the first resource selection window uses a threshold-a channel corresponding to a component carrier recorded in the PPPP mapping table The usage threshold should be greater than the channel usage threshold corresponding to the second resource selection window-the channel usage threshold corresponding to the same component carrier recorded in the PPPP mapping table. In other words, in response to the shortened time period 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 chance of resource selection collision. For example, the mapping table corresponding to the time length of the first resource selection window of 10 ms corresponds to the channel usage threshold value of the third PPPP in the third component carrier, and the mapping length of the second resource selection window is 20 ms. The channel usage threshold value corresponding to the third PPPP in the same third component carrier is 0.6.

In order to facilitate readers' understanding, the following uses Table (1) to Table (10) as examples, which are examples of CBR-PPPP-service type mapping tables. The parameter m of the number of PPPP and the parameter M of the number of component carriers in Tables (1) to (6) are both 8. Among them, Table (1), Table (3) and Table (5) The PPPP group includes one, two, and three PPPPs, respectively, and the parameter T2 of the resource selection window is 20 ms; and the PPPP groups of Tables (2), (4), and (6) also include one, For two and three PPPP, the parameter T2 of the resource selection window is 10ms. The PPPP groups in Tables (7) to (10) include two PPPPs. Among them, the parameter m of the PPPP number in Table (7) and Table (9) and the (m, M) parameter combination of the parameter M of the carrier number are (8, 4) and (4, 8) respectively, and their The parameter T2 of the resource selection window is 20 ms; the parameter m of the PPPP number in Tables (8) and (10) and the parameter (m, M) of the parameter M constituting the number of carriers are also (8, 4 ) And (4,8), the parameter T2 of the resource selection window is 10ms. And Table (1) to Table (10) have two types of services including #1, #2 and other two types of services.

The PPPP group corresponding to a single component carrier in Table (1) includes a PPPP, the parameter T2 of the resource selection window is 20 ms, and the number of component carriers corresponding to PPPP1~PPPP8 is ( n ₁ , n ₂ , n ₃ , n ₄ , n ₅ ,n ₆ ,n ₇ ,n ₈ )=(8,7,6,5,4,3,2,1), and the index offset of the component carrier corresponding to PPPP1~PPPP8 is ( l ₁ ,l ₂ , l ₃ ,l ₄ ,l ₅ ,l ₆ ,l ₇ ,l ₈ )=(0,1,2,3,4,5,6,7).

The PPPP group corresponding to a single component carrier in Table (2) includes a PPPP, the parameter T2 of the resource selection window is 10 ms, and the number of component carriers corresponding to PPPP1~PPPP8 is ( n ₁ , n ₂ , n ₃ , n ₄ , n ₅ ,n ₆ ,n ₇ ,n ₈ )=(8,7,6,5,4,3,2,1), and the index offset of the component carrier corresponding to PPPP1~PPPP8 is ( l ₁ ,l ₂ , l ₃ ,l ₄ ,l ₅ ,l ₆ ,l ₇ ,l ₈ )=(0,1,2,3,4,5,6,7).

The PPPP group corresponding to a single component carrier in Table (3) includes two PPPPs, the parameter T2 of the resource selection window is 20 ms, and the number of component carriers corresponding to PPPP1~PPPP8 is ( n ₁ , n ₂ , n ₃ , n ₄ , n ₅ ,n ₆ ,n ₇ ,n ₈ )=(8,8,6,6,4,4,2,2), and the index offset of the component carrier corresponding to PPPP1~PPPP8 is ( l ₁ ,l ₂ , l ₃ , l ₄ , l ₅ , l ₆ , l ₇ , l ₈ )=(0,0,2,2,4,4,6,6).

The PPPP group corresponding to a single component carrier in Table (4) includes two PPPPs, the parameter T2 of the resource selection window is 10 ms, and the number of component carriers corresponding to PPPP1~PPPP8 is ( n ₁ , n ₂ , n ₃ , n ₄ , n ₅ ,n ₆ ,n ₇ ,n ₈ )=(8,8,6,6,4,4,2,2), and the index offset of the component carrier corresponding to PPPP1~PPPP8 is ( l ₁ ,l ₂ , l ₃ , l ₄ , l ₅ , l ₆ , l ₇ , l ₈ )=(0,0,2,2,4,4,6,6).

The PPPP group corresponding to a single component carrier in Table (5) includes three PPPPs, the parameter T2 of the resource selection window is 20 ms, and the number of component carriers corresponding to PPPP1~PPPP8 is ( n ₁ , n ₂ , n ₃ , n ₄ , n ₅ ,n ₆ ,n ₇ ,n ₈ )=(8,8,8,5,5,5,2,2), and the index offset of the component carrier corresponding to PPPP1~PPPP8 is ( l ₁ ,l ₂ , l ₃ , l ₄ , l ₅ , l ₆ , l ₇ , l ₈ )=(0,0,0,3,3,3,6,6).

The PPPP group corresponding to a single component carrier in Table (6) includes three PPPPs, the parameter T2 of the resource selection window is 10 ms, and the number of component carriers corresponding to PPPP1~PPPP8 is ( n ₁ , n ₂ , n ₃ , n ₄ , n ₅ ,n ₆ ,n ₇ ,n ₈ )=(8,8,8,5,5,5,2,2), and the index offset of the component carrier corresponding to PPPP1~PPPP8 is ( l ₁ ,l ₂ , l ₃ , l ₄ , l ₅ , l ₆ , l ₇ , l ₈ )=(0,0,0,3,3,3,6,6).

The PPPP group corresponding to a single component carrier in Table (7) includes two PPPPs, the parameter T2 of the resource selection window is 20 ms, and the number of component carriers corresponding to PPPP1~PPPP8 is ( n ₁ , n ₂ , n ₃ , n ₄ , n ₅ ,n ₆ ,n ₇ ,n ₈ )=(4,4,3,3,2,2,1,1), and the index offset of the component carrier corresponding to PPPP1~PPPP8 is ( l ₁ ,l ₂ , l ₃ , l ₄ , l ₅ , l ₆ , l ₇ , l ₈ )=(0,0,1,1,2,2,3,3).

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 10 ms, and the number of component carriers corresponding to PPPP1~PPPP8 is ( n ₁ , n ₂ , n ₃ , n ₄ , n ₅ ,n ₆ ,n ₇ ,n ₈ )=(4,4,3,3,2,2,1,1), and the index offset of the component carrier corresponding to PPPP1~PPPP8 is ( l ₁ ,l ₂ , l ₃ , l ₄ , l ₅ , l ₆ , l ₇ , l ₈ )=(0,0,1,1,2,2,3,3).

The PPPP group corresponding to a single component carrier in Table (9) includes two PPPPs, the parameter T2 of the resource selection window is 20 ms, and the number of component carriers corresponding to PPPP1~PPPP4 is ( n ₁ , n ₂ , n ₃ , n ₄ ) =(8,8,4,4), and the index offset of the component carriers corresponding to PPPP1~PPPP4 is ( l ₁ ,l ₂ ,l ₃ ,l ₄ )=(0,0,4,4).

The PPPP group corresponding to a single component carrier in Table (10) includes two PPPPs, the parameter T2 of the resource selection window is 10 ms, and the number of component carriers corresponding to PPPP1~PPPP4 is ( n ₁ , n ₂ , n ₃ , n ₄ ) =(8,8,4,4), and the index offset of the component carriers corresponding to PPPP1~PPPP4 is ( l ₁ ,l ₂ ,l ₃ ,l ₄ )=(0,0,4,4).

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

Then, the processor 160 selects at least one of the candidate component carriers as the selected component carrier and performs resource sensing and selection on the at least one component carrier selected for use by the receiver 120 (step S350). In one embodiment, the processor 160 may determine at least one component carrier to be selected from those candidate component carriers according to the priority order of those 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 priority of the first component carrier is higher than the priority of the second component carrier. The capability of the user equipment 100 is related to the number of simultaneous component carriers supported by the user equipment 100 (including the transmitting end, the receiving end, or both), the supported frequency band, whether carrier aggregation is supported, and/or the allowed bandwidth And other parameters.

FIG. 6 is a schematic diagram illustrating selection of component carriers to be used according to an embodiment of the present invention. Referring to FIG. 6, assume 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 use two component carriers to transmit data. Therefore, the processor 160 will select the two with the highest priority order (ie, the first and second component carriers) as the component carrier to be selected for use.

In another embodiment, if the number of component carriers that the capability of 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 an optional component 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 component carriers for selection. To perform resource sensing for each component carrier selected for use, first, the resource of each component carrier selected for use is divided into multiple resource units (Resource Units, RU) with time and/or frequency, where the size of the resource unit is determined by The upper layer is configured and includes at least one resource block (Resource Block, RB). In one embodiment, the processor 160 may determine idle resource units in each component carrier that is selected for use according to the resource occupancy information. This resource occupancy 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 (used to indicate when the resource is used to transmit data through the receiver 120, or may be a physical sidelink control channel (Physical Sidelink Control Channel) Channel, PSCCH)), and SA news Information analysis to obtain resource occupancy information (for example, a resource is configured or scheduled for data transmission, and the resource pattern of the data transmission).

8A to 8D are schematic diagrams illustrating resource sensing according to an embodiment of the 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 subframe) and frequency. The SA periodic resource area is composed of multiple resource units. Each resource unit includes at least one resource block, the size of which 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 SA area records T-RPT, while the data area carries the data to be transmitted. The processor 160 can determine whether each resource unit in its data area is a busy resource unit or an idle resource unit by receiving and parsing the resource scheduling assignment message of the SA area in each SA cycle resource area. As shown in FIG. 8B, a busy resource unit indicates that it is occupied or that data transmission is scheduled, and an idle resource unit indicates that it is not yet occupied or that no data transmission is scheduled.

If the resource positions of the SA part and the data part shown in FIG. 8A are configured in advance (that is, the resource positions of the SA part and the data part corresponding to each user device are fixed and known by other user devices 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 determine the SA part And the corresponding data part is a free resource area (for example, the information field is represented by "00"). For the decodable resource area in the busy resource area, if the signal strength of the SA part is greater than the preset threshold, and the processor 160 can decode the T-RPT information, the processor 160 will determine that the SA part and the corresponding data part are Decode the resource area (for example, represented by "01"). For the collision resource area in the busy resource area, if the strength of the SA part signal is greater than the preset threshold, and the processor 160 cannot decode the T-RPT information, the processor 160 will recognize the SA part and the data part as 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 resource positions of the SA part and the data part corresponding to each user device are not fixed and are If other user equipment does not know in advance), the idle resource area, the decodable resource area, and the collision resource area are determined as described below. With regard to the free resource area, the difference from the embodiment where the foregoing positions have been configured in advance is that only the SA part is determined as the free resource area. For the decodable resource area in the busy resource area, it is the same as the embodiment in which the foregoing positions have been configured in advance. With respect to the collision resource area in the busy area, it is different from the foregoing embodiment where the position has been configured in advance is that only the SA part is determined as the collision resource area.

In another embodiment for resource sensing, the process is divided into two stages, one is based on Subchannel resources, and the other is based on Resource Block Group (RBG). For the first-stage resource sensing based on sub-channel resources, the resources of each component carrier selected for use are first divided into multiple sub-channel resources in time and/or frequency, where the sub-channel resource size is set by the upper layer and includes at least A resource block group. The processor 160 receives through the receiver 120 And measure the signal strength of all sub-channel resources in each component carrier selected, and determine each component carrier selected based on a first energy threshold (can be determined in advance or dynamically adjusted, and based on the average power of background noise) The usage of all sub-channel resources in In response to the measured energy (average or a certain section) of a sub-channel resource in a selected component carrier being not greater than the energy threshold, the processor 160 determines that the sub-channel resource is an idle sub-channel resource, The idle sub-channel resource is a candidate resource for resource selection. In response to the measured energy of 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 sub-channel resources and idle sub-channel resources. In addition, the resources of each sub-channel can be distinguished by different position information (in the figure, taking coordinates as an example, (1,1) represents sub-channel 1 of 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 allocates 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, and the number is set by the upper layer. The processor 160 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 the measured energy (average or a certain section) of a resource block group in a busy sub-channel resource is not greater than 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 this resource block group being greater than the energy threshold, the processor 160 determines this 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 sub-channel resource can be divided into four resource block groups 1-4. 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 concludes that the resource block group 1 is an idle resource block group Group (Idle Resource Block Group, IRBG) (corresponding to idle resources) and resource block groups 2~4 are Busy Resource Block Group (BRBG) (corresponding to busy resources).

In one 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 in a certain section) of a busy resource block group not exceeding the second energy threshold, the processor 160 determines that the busy resource block group is a decodable resource area. In response to the measured energy of the resource block group being greater than the energy threshold, the processor 160 determines that the busy resource block group is the collision resource area.

In yet another embodiment for resource sensing, the processor 160 may also combine the aforementioned resource sensing method based on resource occupancy information and two-stage energy measurement, and indicate the resource usage indication (including whether the resource is occupied, Decodable or idle, etc.) are accompanied by weight coefficients for comparison (for example, to determine 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 positions 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 be given to the decodable resource area and the collision resource area. High weighting factor. Whereas the resource positions of the SA part and the data part are not configured in advance, the resource usage instruction obtained by using the resource occupancy information method will only give a higher weighting factor to the decodable resource area.

The resource pool of each component carrier selected for use can be distinguished based on PPPP. In an embodiment, the processor 160 may divide the resource pools (RP) (for example, the resource R shown in FIGS. 8B and 8C) corresponding to the component carriers selected for use into equal parts or different proportions according to PPPP. FIG. 9A and FIG. 9B are schematic diagrams illustrating resource pool splitting by two examples. Please refer to FIG. 9A first, assuming that there is a first PPPP to a fourth PPPP (ie, PPPP1~PPPP4), and the processor 160 divides the resource pool RP into four equal parts on average, and these four equal parts are assigned to the four Various types of PPPP user equipment 100 are used. That is, the user equipment 100 will only perform resource sensing and selection from the resource part corresponding to its PPPP.

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

For resource selection, the processor 160 may use component carriers for each selection Each resource unit in is assigned a corresponding location number in sequence, where the size of the resource unit is set by the upper layer to include at least one resource block. 10A and 10B are schematic diagrams illustrating resource selection and resource reselection. Please refer to FIG. 10A first. Here, it is assumed that the resource unit includes one resource block. Each resource block in the resource pool RP2 has its corresponding location number set in advance and known to all user equipment. The location numbers are continuous and not repeat. After the resource sensing is performed by the processor 160, the resource location corresponding to the busy resource block (Busy Resource Block, BRB) can be obtained (the set of corresponding busy resource location numbers is {1,2,5,12,13,14 ,26}) and the resource location corresponding to the idle resource block (Idle Resource Block, IRB) (the set of corresponding 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 the idle resource block corresponding to one of the location numbers of the corresponding idle resource blocks (for example, the idle resource block IRB in FIG. 10A). For example, the processor 160 selects a location number from the set of idle resource location numbers, and performs data transmission in the idle resource block corresponding to the location number, and then determines whether the selected resource collides (step S715). In response to that the selected resources have not collided, the processor 160 will continue to use the selected corresponding resources for data transmission periodically in a semi-persistent scheduling manner (step S730). Taking FIG. 10B as an example, a non-colided resource block (Non-Collided Resource Block, NCRB) is only selected by a single user equipment 100, and the user equipment 100 that selects these non-collided resource blocks NCRB can use the institute continuously Select the corresponding resource for data transmission.

In response to the collision of the selected resources, the processor 160 decides to perform resource selection on all idle resources or all collision resources subsequently sensed according to the size of the location number corresponding to the resource selection. The collision resource means that at least two user equipments 100 are selected at the same time when selecting resources. Taking FIG. 10B as an example, the collided resource block (Collided Resource Block, CRB) is selected by more than two user devices 100 at the same time. In an embodiment, the user equipment 100 that encounters the resource selection collision will re-sense the resource during the subsequent sensing window, and again determine that the resource is a busy resource block, an idle resource block, and a collision resource One of the blocks, and determine the number of user devices 100 in each collision resource block that have selected this resource block at the same time. Then, the user equipment 100 encountering the resource selection collision will perform resource reselection. The user equipment 100 that encountered the resource selection collision at the previous location number with the smaller resource selection will perform the above resource selection again for all collision resource blocks, that is, randomly assign the location numbers of the corresponding collision resource blocks The collision resource block corresponding to one of them performs resource selection. On the other hand, the user equipment 100 that encountered the resource selection collision with the location number of the previous resource selection that is larger or the new user equipment 100 that performs the resource selection for the first time will perform the above resource selection on all free resource blocks, Instead of performing the above resource selection on all collision resource blocks, it is to randomly perform resource selection on the idle resource block corresponding to one of the location numbers of these corresponding idle resource blocks. In this way, different types of user equipment 100 are allowed to decentralize the selection of different types of resource blocks, so as to reduce the probability of resource selection collision and improve its reliability

Taking FIG. 10B as an example, assume that two user equipments 100 select the previous resource The selected resource block with location number 17 collided, the other two user devices 100 collided with the resource block with location number 19 selected in the previous resource, and the three user device 100 were in front. The resource block with the location number 27 selected by the secondary resource collides, and the three user devices 100 collide with the resource block with the location number 29 selected by the previous resource. Then, in the next resource selection period, two of the previous resource selection location number 17 (the location number is less than the location numbers 19, 27, and 29 corresponding to the other three collision resource blocks) encountered a resource selection collision The user equipment 100 will randomly select from all collision resource blocks corresponding to the location numbers 17, 19, 27, and 29 corresponding to all collision resource blocks, and the remaining eight user equipments 100 that encounter resource selection collisions Then randomly selected from all the idle resource blocks corresponding to the location numbers 3, 4, 6, 10, 11, 15, 16, 20, 21, 25, 30 corresponding to all the idle resource blocks.

It should be noted that the aforementioned determination of whether the location number is larger or smaller is based on the location 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 location number threshold value is half of the number of all collision resource blocks, so the location number threshold value is 2, and the user equipment 100 that encounters the resource selection collision with the first two digits of the corresponding location number will be removed from all collision resource blocks (All (4) collision resource blocks with corresponding position numbers 17, 19, 27, and 29 are randomly selected). In addition, in other embodiments, the user equipment 100 with a smaller location number may also randomly select idle resources, while the user equipment 100 with a larger location number randomly selects collision resources.

In addition to resource reselection of component carriers used for the same selection, reaction When the number of collisions that occur when a resource is selected from a first selected component carrier exceeds a threshold (for example, 3, 5, or 7 times), the processor 160 will differ from the component carrier used by the first selection Another newly selected component carrier is used for resource sensing and selection (step S750), and the resource sensing and selection for the first selected component carrier will be stopped, where the other new selected component is used The carrier comes from selecting a component carrier with the highest priority among 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 selected component carrier. However, for example, when the user equipment 100 selects resources on the second component carrier and the number of collisions exceeds a threshold (for example, 5 times), the user equipment 100 will select from other candidate component carriers according to the priority order The component with the highest priority (for example, the third component carrier) is used as a new component carrier for resource sensing and selection.

In summary, the user equipment and resource sensing and selection methods of the embodiments of the present invention provide an improved solution for V2X mode four. The user equipment refers to the channel usage threshold-PPPP mapping table set by the upper layer based on its PPPP to obtain the component carrier corresponding to its PPPP and its channel usage threshold, and measures the channel usage from the corresponding component carrier. Compare with the threshold of the corresponding channel to obtain the candidate component carrier. Then, according to the capabilities of the user equipment and the priority order of component carriers, at least one component carrier selected from the candidate component carriers is selected for use, and resource sensing and selection are simultaneously performed on these component carriers selected for use. 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. For resource selection, if the result of the selection encounters resources If you select collision, the location number of the previous resource selection will be used to determine the subsequent resource selection as resource selection among all idle resources or all collision resources. In addition, resource reselection can be performed on idle resources in each component carrier selected for use based on a previous information, where the previous information is based on a resource selection result for each component carrier selected for use, and the resource selection result and the resource Choose collision related.

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

S310~S350‧‧‧Step

Claims (50)

A resource sensing and selection method suitable for a user equipment (User Equipment, UE). The resource sensing and selection method includes: measuring and obtaining channel usage of all multiple component carriers (CCs); Compare the channel usage measurement value of each component carrier and the channel usage threshold value corresponding to the ProSe Per-packet Priority (PPPP) corresponding to the user equipment to select from these component carriers Determining candidate component carriers, wherein the number of candidate component carriers is an integer greater than or equal to zero; and at least one of the candidate component carriers is selected as a component carrier to be selected for use and resources are allocated to the at least one component carrier to be used for selection Sensing and selection. The resource sensing and selection method as described in item 1 of the patent application scope, wherein the step of determining the candidate component carriers includes: comparing the channel usage measurement value of each component carrier and the corresponding corresponding component carrier The channel usage threshold corresponding to the priority of individual packets of the corresponding proximity service; the channel usage measurement of a first component carrier in response to the component carriers is less than the corresponding channel usage threshold, the A component carrier as one of the candidate component carriers; and in response to the channel usage measurement of the first component carrier being not less than the corresponding channel usage threshold, the first component carrier is not considered as the candidate Form one of the carriers. The resource sensing and selection method as described in item 2 of the patent application scope, wherein the channel usage measurement value of each of the component carriers and the corresponding individual packet priority of each of the component carriers in the corresponding proximity service are compared The corresponding steps of the channel usage threshold include: obtaining a channel usage threshold-proximity service individual packet priority mapping table, wherein the channel usage threshold-proximity service individual packet priority mapping table records all component carriers in all corresponding Thresholds for all channels corresponding to the individual packet priority of the proximity service of the adjacent service; and the channel usage measurement value and the threshold of the channel usage of the user equipment of the individual packet priority of the proximity service for each of the component carriers- In the proximity service individual packet priority mapping table, the corresponding proximity service individual packet priority is compared at each channel usage threshold corresponding to the corresponding component carrier. The resource sensing and selection method as described in item 3 of the patent application scope, in which the channel uses a threshold-proximity service individual packet priority mapping table to record all the proximity service individual packet priority records including their corresponding index basis A priority order. The resource sensing and selection method as described in item 4 of the patent application scope, in which the channel uses a threshold-proximity service individual packet priority mapping table to record the component carriers corresponding to all of the proximity service individual packet priorities The number is that the number of component carriers corresponding to the higher priority order 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 order of the individual packet priority of the proximity service. The resource sensing and selection method as described in item 4 of the patent application scope, in which the channel uses a threshold-proximity service individual packet priority mapping table to record each component corresponding to each of the proximity service individual packet priorities Carriers include their corresponding indexes according to a priority order. The resource sensing and selection method as described in item 6 of the patent application scope, wherein the channel uses a threshold-proximity service individual packet priority mapping table to record each component corresponding to each of the proximity service individual packet priorities The priority order of the component carriers in the carrier including their corresponding indexes 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; and all the neighboring services The index of the foremost order of the component carriers corresponding to the individual packet priority is that the index of the foremost order of the component carriers corresponding to the higher priority order of the adjacent service individual packet priority is less than or equal to The index of the foremost order among the component carriers corresponding to the lower priority order of the individual packet priority of the proximity service. The resource sensing and selection method as described in item 4 of the patent application scope, in which 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 threshold of channel usage corresponding to individual packet priorities is different. The method of resource sensing and selection as described in item 3 of the patent application scope, in which the channel uses the threshold-recorded by the individual service priority mapping table of the proximity service Each of the adjacent service individual packet priorities has different thresholds for channel usage corresponding to all the corresponding different component carriers. The resource sensing and selection method as described in item 8 of the patent application scope, in which the channel uses a threshold-proximity service individual packet priority mapping table to record each of the proximity service individual packet priority in all corresponding 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 higher component carrier index. The resource sensing and selection method as described in item 3 of the patent application scope, wherein the channel usage threshold corresponding to a first resource selection window-a channel corresponding to the component carrier recorded in the priority map of the individual packet of the proximity service The usage threshold is greater than the channel usage threshold corresponding to a second resource selection window-the channel usage threshold corresponding to the same component carrier recorded in the neighboring service individual packet priority mapping table, wherein the time length of the first resource selection window Less than the time length of the second resource selection window. The resource sensing and selection method as described in item 3 of the patent application scope, wherein the channel usage threshold-neighbor service individual packet priority mapping table records all the neighbor 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. The resource sensing and selection method as described in item 2 of the patent application scope, wherein the measurement value of each channel usage is a channel busy ratio (CBR) value. The resource sensing and selection method as described in item 1 of the patent application scope, wherein the step of obtaining the channel usage measurement values of all the component carriers includes: dividing a sensing window by at least one measurement period; and the quantity Measuring and obtaining channel usage measurement values of all the component carriers in the at least one measurement period. The method for resource sensing and selection as described in item 1 of the patent application scope, wherein the step of selecting at least one of the candidate component carriers as the component carrier to be selected 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 the component carrier to be selected for use; and resource sensing and selection are performed on the at least one component carrier to be selected for use. The resource sensing and selection method as described in item 1 of the patent application scope, wherein the step of performing resource sensing and selection on the at least one component carrier selected for use includes: And/or frequency division into multiple resource units, wherein the resource unit size 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 occupancy information , Where the resource occupancy 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 resource sensing and selection method as described in item 16 of the patent application scope, wherein the determination of the at least one idle resource unit in each of the selected component carriers based on the resource occupancy information includes: from at least one scheduling assignment (Scheduling Assignment (SA) message to obtain the resource occupancy information. The resource sensing and selection method as described in item 1 of the patent application scope, wherein the step of performing resource sensing and selection on the at least one component carrier selected for use includes: And/or frequency division into multiple sub-channel resources, where the sub-channel resources include 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; In response to the measured energy of a first subchannel resource in a component carrier selected for use not exceeding the energy threshold, it is determined that the first subchannel resource is an idle subchannel resource, wherein the idle subchannel resource is used A candidate resource for resource selection; and in response to the measured energy of the first sub-channel resource being greater than the energy threshold, determining that the first sub-channel resource is a busy sub-channel resource. The method for resource sensing and selection as described in item 18 of the patent application scope, wherein the steps of resource sensing and selection for the at least one component carrier selected for use include: Determine each busy sub-channel resource in each component carrier selected for use; divide each busy sub-channel resource into multiple resource block groups with time and/or frequency; determine each based on an energy threshold A usage of the resource block group; in response to the measured energy of a first resource block group in a busy sub-channel resource is not greater than the energy threshold, the first resource block group is determined to be An idle resource block group, wherein 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, determining the The first resource block group is not the idle resource block group. The resource sensing and selection method as described in item 1 of the patent application scope, wherein the step of performing resource sensing and selection on the at least one selected component carrier includes: according to a previous information, for each selected component carrier Resource reselection is performed on the idle resources in, wherein the previous information is based on a resource selection result for each component carrier previously used by the selection, and the resource selection result is related to the collision of resource selection. The resource sensing and selection method as described in item 20 of the patent application scope, 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 units are assigned corresponding position numbers in sequence, wherein the size of the resource unit is set by the upper layer and includes at least Resource blocks; and randomly performing initial resource selection for the idle resource unit corresponding to one of the location numbers of the corresponding idle resource units. As described in Item 21 of the patent application scope, the resource sensing and selection method includes: in response to the resource selection corresponding to the initial resource selection or the resource reselection, there is no resource selection collision, continuous use of the initial resource selection or the resource reselection Select the corresponding resource for data transmission; and respond to the resource selection collision in response to the initial resource selection or the resource reselection, and determine the subsequent sensing based on the size of the location number corresponding to the initial resource selection or the resource reselection All idle resources or all collision resources are used for resource selection, where the collision resource indicates that one of the resource units is simultaneously selected when at least two of the user equipments perform resource selection. The resource sensing and selection method as described in item 1 of the patent application scope, wherein the resource sensing and selection method for the at least one component carrier selected for use further includes: a resource pool basis corresponding to the at least one component carrier selected for use The priority of the individual packets of the corresponding adjacent services is divided into the same equal division or different proportions. The resource sensing and selection method as described in item 1 of the patent application scope, wherein the resource sensing and selection method for the at least one component carrier selected for use includes: reacting to one of the component carriers selected from the at least one component used for selection First choice The component carrier selects resources and the number of collisions exceeds the threshold of a number of times. Reselect one of the other candidate component carriers with the highest priority as a newly selected component carrier and perform resource sensing on this selected component carrier and select. The resource sensing and selection method as described in item 1 of the patent application scope, in which the user equipment is suitable for Vehicle-to-Everything (V2X) mode four. A user equipment includes: a receiver to receive signals; a transmitter to transmit signals; a processor coupled to the receiver and the transmitter, and configured to: obtain through measurement through the receiver Channel usage of all multiple component carriers; compare the channel usage measurement value of each component carrier with the channel usage threshold corresponding to the individual packet priority of the proximity service corresponding to the user equipment to select from these component carriers Determine the candidate component carrier in which the number of the candidate component carrier is an integer greater than or equal to zero; and select at least one of the candidate component carriers as the component carrier to be selected and use the at least one selected carrier through the receiver The component carrier is used for resource sensing and selection. The user equipment as described in item 26 of the patent application scope, wherein the processor is configured to: compare the channel usage measurement value of each of the component carriers and the corresponding The channel usage threshold of the component carrier corresponding to the priority of the corresponding individual packet of the adjacent service; the channel usage value of a first component carrier reflected in the component carriers is less than the corresponding channel usage threshold, The first component carrier is one of the candidate component carriers; and the channel usage measurement value reflecting that the first component carrier is not less than the corresponding channel usage threshold, the first component carrier is not used as the These candidates constitute one of the carriers. The user equipment as described in item 27 of the patent application scope, 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 of all component carriers corresponding to individual packet priorities of all corresponding proximity services; and the user equipment priority of the individual packet priority of the proximity service on each component carrier The channel usage measurement value is compared with the channel usage threshold value in the channel usage threshold-neighbor service individual packet priority mapping table for the corresponding channel usage threshold value of each corresponding component carrier in the corresponding neighbor service individual packet priority map. The user equipment as described in item 28 of the patent application scope, wherein the channel usage threshold-neighbor service individual packet priority mapping table records all the neighbor service individual packet priority records including their corresponding indexes according to a priority order arrangement. The user equipment as described in item 29 of the patent application scope, wherein the channel usage threshold-proximity service individual packet priority mapping table records the number of component carriers corresponding to all of the proximity service individual packet priorities recorded in the mapping table, The number of component carriers corresponding to the higher priority order of the adjacent service individual packet priorities is greater than or equal to the number of component carriers corresponding to the lower priority order of the adjacent service individual packet priority. The user equipment as described in item 29 of the patent application scope, wherein the channel usage threshold-proximity service individual packet priority mapping table records the component carriers corresponding to each of the proximity service individual packet priority records included in the channel The corresponding indexes are arranged according to a priority order. The user equipment as described in item 31 of the patent application scope, wherein the channel usage threshold-proximity service individual packet priority mapping table records the component carriers corresponding to each of the adjacent service individual packet priorities recorded in the proximity service The priority order of the component carriers including their corresponding indexes 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; and all the individual packets of the neighboring services have priority The index of the foremost order of the component carriers corresponding to the weight is the index of the foremost order of the component carriers corresponding to the higher priority of the individual packet priority of the neighboring service is less than or equal to the neighboring service The index of the foremost order among the component carriers corresponding to the lower priority order of individual packet priorities. The user equipment as described in item 29 of the patent application scope, wherein the channel usage threshold-proximity service individual packet priority mapping table records that all corresponding different proximity service individual packets in each of the component carriers have priority The threshold of the channel usage corresponding to the weight is different. The user equipment as described in item 28 of the patent application scope, wherein the channel usage threshold-proximity service individual packet priority mapping table records each of the proximity service individual packet priorities in all of the corresponding different component carriers The corresponding channel usage threshold is different. The user equipment as described in item 33 of the patent application scope, wherein the channel usage threshold-proximity service individual packet priority mapping table records each of the proximity service individual packet priorities in all corresponding component carriers. The corresponding channel usage threshold value is that the channel usage threshold value corresponding to the smaller component carrier index is greater than the channel usage threshold value corresponding to the higher component carrier index. The user equipment as described in item 28 of the patent application scope, wherein the channel usage threshold corresponding to a first resource selection window-a channel usage threshold corresponding to the component carrier recorded in the neighboring service individual packet priority mapping table is greater than A channel usage threshold corresponding to a second resource selection window-the channel usage threshold corresponding to the same component carrier recorded in the priority mapping table of the individual packets of the proximity service, wherein the time length of the first resource selection window is less than the second resource Choose the length of the window. The user equipment as described in item 28 of the patent application scope, in which the channel usage threshold-neighbor service individual packet priority mapping table records all such The individual packet priorities of these proximity services correspond to at least one service type, and the priority order of the at least one service type is the same. The user equipment as described in item 27 of the patent application scope, wherein the measurement value of each channel usage is a channel busy rate value. The user equipment as described in item 26 of the patent application range, wherein the processor is configured to: divide a sensing window by at least one measurement period; and obtain the at least one quantity by measurement through the receiver Measured values of channel usage of all these component carriers in the measurement period. The user equipment as described in item 26 of the patent application scope, wherein the processor is configured to: select from the candidate component carriers according to the priority order of the candidate component carriers and the capabilities of the user equipment At least one of the component carriers selected for use; and resource sensing and selection of the at least one component carrier selected for use. The user equipment as described in item 26 of the patent application scope, wherein the processor is configured to: divide the resources of each selected component carrier into multiple resource units in time and/or frequency, wherein the The size of the resource unit is set by the upper layer and includes at least one resource block; at least one idle resource unit in each of the component carriers selected for use is determined according to a resource occupancy information, wherein the resource occupancy information is related to data transmission resources The allocation situation, and the at least one idle resource unit is a candidate resource for resource selection. The user equipment according to item 41 of the patent application scope, wherein the processor is configured to: obtain the resource occupancy information from at least one scheduled assignment message through the receiver. The user equipment as described in item 26 of the patent application scope, wherein the processor is configured to: divide the resources of each selected component carrier into multiple sub-channel resources with time and/or frequency, wherein the The sub-channel resources include 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; this is reflected in the first The energy measured for a sub-channel resource is not greater than the energy threshold, and the first sub-channel resource is determined to be an idle sub-channel resource, where the idle sub-channel resource is a candidate resource for resource selection; The measured energy of the first sub-channel resource is greater than the energy threshold, and the first sub-channel resource is determined to be a busy sub-channel resource. The user equipment as described in item 43 of the patent application scope, wherein the processor is configured to: determine each of the busy sub-channel resources in each of the selected component carriers; use each of the busy sub-channels Resources are divided into multiple resources by time and/or frequency Block group; determine the usage of each resource block group according to an energy threshold; reflect that the energy measured for a first resource block group in a busy sub-channel resource is not greater than the energy threshold Value, judging that the first resource block group is an idle resource block group, wherein the idle resource block group is a candidate resource for resource selection; and reflected in the first resource block group If the measured energy is greater than the energy threshold, it is determined that the first resource block group is not the idle resource block group. The user equipment as described in 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 used according to a previous information, wherein the previous information It is based on a resource selection result for each component carrier used in the previous selection, and the resource selection result is related to the collision of resource selection. 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 component carrier selected for use, wherein the resource The unit size is set by the upper layer to include at least one resource block; and a random resource unit corresponding to one of the location numbers of the corresponding idle resource units is randomly selected for initial resource selection. The user equipment as described in item 46 of the patent application scope, wherein the processor is configured to: continue to use the initial resource selection in response to no resource selection collision in response to the initial resource selection or the resource reselection corresponding resource Or the resource reselects the corresponding resource for data transmission; and a resource selection collision in response to the initial resource selection or the resource reselection corresponds to the size of the location number corresponding to the initial resource selection or the resource reselection Select all the idle resources or all collision resources that are subsequently sensed, where the collision resources indicate that one of the resource units is selected at the same time when at least two of the user equipments perform resource selection. The user equipment as described in item 26 of the patent application scope, 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 adjacent services Points or different proportions. The user equipment as described in item 26 of the patent application range, wherein the processor is configured to: react to a collision with a resource selected by a first selected component carrier out of the at least one component carrier selected for use If the number of times exceeds the threshold value of one time, re-select a component carrier with the highest priority among other candidate component carriers as a newly selected component carrier and perform resource sensing and selection on the component carrier selected for use. The user equipment as described in item 26 of the patent application scope is applicable to the vehicle-to-vehicle communication mode 4.

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