CN113518323B

CN113518323B - Resource selection method and terminal

Info

Publication number: CN113518323B
Application number: CN202010279554.5A
Authority: CN
Inventors: 刘龙山; 陈殿勇; 沈天珺; 赵丽; 赵锐
Original assignee: CICTCI Technology Co Ltd
Current assignee: Datang Gaohong Zhilian Technology Chongqing Co ltd
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2024-01-05
Anticipated expiration: 2040-04-10
Also published as: CN113518323A

Abstract

The invention provides a resource selection method and a terminal, and relates to the technical field of communication. The method comprises the following steps: determining a candidate resource set in a resource selection window according to the number m of transmission resources required to be selected by a terminal and/or the resource distribution of candidate resources in the resource selection window; selecting m transmission resources from the candidate resource set; wherein m is a positive integer. According to the scheme, the candidate resource set is determined by considering at least one of the number of transmission resources required to be selected by the terminal and the resource distribution of the candidate resources in the resource selection window, so that the problems that the resource reservation in the resource selection window is unbalanced and the number of the candidate resources is not changed along with the change of the number of the resources required to be selected in the existing resource selection process are solved.

Description

Resource selection method and terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a resource selection method and a terminal.

Background

The New air interface (New Radio, NR) -vehicular wireless communication technology (Vehicle to Everything, V2X) multiplexes the basic principle of long term evolution (Long Term Evolution, LTE) -V2X resource selection, namely, a candidate resource set is formed in a determined resource selection window according to the proportion of X%, and then transmission resources are selected from the candidate resource set. However, unlike LTE-V2X, which has the characteristics of service periodicity and semi-static scheduling of resources, NR-V2X has the characteristics of periodic and non-periodic service mixing, and semi-static scheduling and dynamic scheduling mixing, so that the existing resource selection process is easy to cause the problems of unbalanced resource reservation in a resource selection window, no change of the number of candidate resources along with the change of the number of resources to be selected, and the like.

Disclosure of Invention

The invention provides a resource selection method and a terminal, which solve the problems that the existing resource selection process is easy to cause unbalanced resource reservation in a resource selection window, the number of candidate resources is not changed along with the change of the number of resources needing to be selected, and the like.

The embodiment of the invention provides a resource selection method, which is applied to a terminal and comprises the following steps:

determining a candidate resource set in a resource selection window according to the number m of transmission resources required to be selected by a terminal and/or the resource distribution of candidate resources in the resource selection window;

selecting m transmission resources from the candidate resource set;

wherein m is a positive integer.

Optionally, the number of candidate resources in the candidate resource set and the number of resources with the target proportion X% in the resource selection window satisfy a first preset relationship.

Optionally, the first preset relationship includes any one of the following:

m1 is more than or equal to min (X% is M, K is M), K is high-level configuration;

M1≥X％*M；

wherein X% is predefined, M1 is the number of candidate resources in the candidate resource set, and M is the total number of resources within the resource selection window.

Optionally, the method further comprises:

and determining a target proportion corresponding to the transmission resource number m according to a second preset relation between the transmission resource number and the target proportion.

Optionally, the second preset relationship includes any one of the following:

X _m ＝m*X ₁ m is greater than 1;

X _m ＝X ₁ +(m-1) S, m is greater than 1, wherein S is a high-level configuration;

presetting a mapping relation;

wherein X is _m For a target ratio corresponding to the number m of transmission resources, X ₁ The target ratio when m=1 is configured for the higher layer.

Optionally, determining the candidate resource set in the resource selection window according to the resource distribution of the candidate resource in the resource selection window includes:

dividing the resource selection window into a first sub-window and a second sub-window when the trailing edge of the resource selection window meets a first preset condition;

under the condition that the number of the candidate resources in the first sub-window does not meet a second preset condition, updating the power threshold value according to a rule of sequentially increasing a first preset value on the basis of the power threshold value until the number of the candidate resources in the first sub-window meets the first preset condition;

under the condition that the number of the candidate resources in the first sub-window meets the first preset condition, determining the candidate resource set according to the candidate resources in the first sub-window and the candidate resources in the second sub-window;

wherein the first preset value is a preset power variation value.

Optionally, the second preset condition includes any one of the following:

the number of candidate resources in the first sub-window is greater than or equal to the product of the total number of resources in the first sub-window and the target proportion;

the number of candidate resources in the first sub-window is greater than or equal to a product of a total number of resources in the first sub-window and the target proportion, and the number of candidate resources in the resource selection window is greater than or equal to a product of a total number of resources in the resource selection window and the target proportion.

Optionally, determining the candidate resource set in the resource selection window according to the resource distribution of the candidate resource in the resource selection window further includes:

under the condition that the back edge of the resource selection window does not meet the first preset condition and the number of candidate resources in the resource selection window does not meet the third preset condition, updating the power threshold value according to the rule of sequentially increasing the second preset value on the basis of the power threshold value until the number of candidate resources in the resource selection window meets the third preset condition;

determining the candidate resource set according to the candidate resources in the resource selection window under the condition that the trailing edge of the resource selection window does not meet the first preset condition and the number of the candidate resources in the resource selection window meets the third preset condition;

Wherein the second preset value is a preset power variation value.

Optionally, the first preset condition includes:

the trailing edge of the resource selection window is larger than the difference value between a third preset value and Tproc0, wherein Tproc0 is the time interval between the trailing edge of the sensing window and the resource selection triggering moment;

the third preset value is a maximum time slot value of any two resource intervals among the plurality of resources indicated by the preset through link control information SCI.

Optionally, the third preset condition includes:

the number of candidate resources in the resource selection window is greater than or equal to the product of the total number of resources in the resource selection window and the target ratio.

Optionally, the selecting m transmission resources in the candidate resource set includes:

determining a third sub-window in the resource selection window according to the m and the front edge and the rear edge of the resource selection window;

if the number of the candidate resources in the third sub-window does not meet a fourth preset condition, sequentially expanding the trailing edge of the third sub-window by a time slot rule to update the trailing edge of the third sub-window until the number of the candidate resources in the third sub-window meets the fourth preset condition;

And if the number of the candidate resources in the third sub-window meets the fourth preset condition, selecting m transmission resources from the candidate resources in the third sub-window.

Optionally, the fourth preset condition includes:

and the number of the candidate resources in the third sub-window is greater than or equal to Z, wherein Z is high-level configuration or QoS QOS generation, and Z is a positive integer.

Optionally, the determining a third sub-window in the resource selection window according to the m, the front edge and the back edge of the resource selection window includes:

determining a third sub-window in the resource selection window according to the values of T1 and T1+ (T2-T1)/m;

wherein T1 is the front edge of the resource selection window and the third sub-window, T2 is the back edge of the resource selection window, and the value of T1+ (T2-T1)/m is the back edge of the third sub-window, and the value of (T2-T1)/m is an integer.

The embodiment of the invention also provides a terminal, which comprises: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of:

Selecting m transmission resources from the candidate resource set;

wherein m is a positive integer.

Optionally, the first preset relationship includes any one of the following:

M1≥X％*M；

Optionally, the processor when executing the computer program implements the steps of:

Optionally, the second preset relationship includes any one of the following:

X _m ＝m*X ₁ m is greater than 1;

X _m ＝X ₁ s, m is greater than 1, where S is a higher layer configuration;

presetting a mapping relation;

Optionally, the processor when executing the computer program specifically implements the following steps:

wherein the first preset value is a preset power variation value.

Optionally, the second preset condition includes any one of the following:

wherein the second preset value is a preset power variation value.

Optionally, the first preset condition includes:

Optionally, the third preset condition includes:

Optionally, the fourth preset condition includes:

The embodiment of the invention also provides a terminal, which comprises:

a first determining module, configured to determine a candidate resource set in a resource selection window according to a number m of transmission resources required to be selected by a terminal and/or resource distribution of candidate resources in the resource selection window;

a first selection module, configured to select m transmission resources from the candidate resource set;

wherein m is a positive integer.

Embodiments of the present invention also provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the resource selection method as described above.

The technical scheme of the invention has the beneficial effects that:

the method comprises the steps of determining a candidate resource set in a resource selection window through the number m of transmission resources required to be selected by a terminal and/or the resource distribution of candidate resources in the resource selection window, selecting m transmission resources in the candidate resource set, and determining the candidate resource set through considering at least one of the number m of the transmission resources required to be selected by the terminal and the resource distribution of the candidate resources in the resource selection window, thereby solving the problems that the resource reservation in the resource selection window is unbalanced and the number of the candidate resources is not changed along with the change of the number of the resources required to be selected in the existing resource selection process.

Drawings

FIG. 1 is a schematic diagram showing a time relationship between a sending window and a resource selection window according to an embodiment of the present invention;

FIG. 2 shows a flow chart of a resource selection method of an embodiment of the invention;

FIG. 3 shows a schematic block diagram of a terminal according to an embodiment of the present invention;

fig. 4 is a schematic diagram of an implementation structure of a terminal according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The terms "first," "second," and the like in the description of the present application, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be capable of operation in sequences other than those illustrated or described herein, for example. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. In the specification, "and/or" means at least one of the connected objects.

The following description is merely provided as an example, and changes may be made in the function and arrangement of the elements discussed without departing from the spirit and scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present invention, the following description is provided.

LTE-V2X resource selection procedure:

in the Mode4 Mode, a basic mechanism of resource allocation is sensing+semi-persistent scheduling (Semi Persistent Scheduling, SPS), that is, a User Equipment (UE) node obtains, in real time, a resource occupation condition of other UE nodes and a subsequent resource occupation condition through real-time Sensing, and when the UE node itself has a resource selection/reselection requirement, selects a suitable idle resource according to the obtained resource occupation condition to send.

The terminal may be referred to as a terminal Device or UE, and the terminal may be a terminal-side Device such as a mobile phone, a tablet (Tablet Personal Computer), a Laptop (Laptop Computer), a personal digital assistant (Personal Digital Assistant, PDA), a mobile internet Device (Mobile Internet Device, MID), a Wearable Device (Wearable Device), or a vehicle-mounted Device, which is not limited to a specific type of the terminal in the embodiment of the present invention.

In terms of the resource selection process, the first step is: performing resource elimination on resources in the selection window according to decoding information corresponding to scheduling control (Scheduling Assignment, SA) for successfully decoding the perception information of the perception window and measurement information; a second part: according to the acting rate smoothing processing of the sending information, a candidate resource set is determined; and a third step of: and selecting proper resources from the determined candidate resource set.

Mainly two windows are involved: the time relation between the sending window and the resource selection window (i.e. the resource selection window) is shown in fig. 1, and n is the triggering moment of resource selection.

Specifically, step1: setting all candidate resources in the resource selection window as available resources;

step2: a resource elimination process, obtaining an available resource set:

the resources in the resource selection window are selected, but the information acquired at present only has the sensing information in the sensing window, namely the occupation condition of the resources in the resource selection window is supposed according to the acquired sensing information in the sensing window, and the resources in the resource selection window are further screened.

Specifically, step2 specifically includes:

step2-1: determining valid and up-to-date SA: the information of other nodes known in the sending window is valid only by the latest one-time reservation and the time belongs to the resource or the SA of the resource after the trailing edge of the resource selection window, in other words, the SA of the resource reserved by other nodes and the time belongs to the resource selection window is valid, or the SA reserved by other nodes and the time belongs to the resource after the trailing edge of the resource selection window is valid.

Step2-2: and excluding candidate subframes corresponding to skipped subframes, wherein the subframes are called skip subframes, and the UE itself transmits the subframes and cannot monitor service packets transmitted by other UEs on the transmission subframes.

Step2-3: determining whether a resource within the resource selection window needs to be excluded, while candidate resources satisfying the 2 conditions below need to be excluded from the resource selection window:

the SA indicates that the next resource reservation and collision will occur with a Transport Block (TB) sent by the candidate resource or a TB sent by a subsequent resource corresponding to the candidate resource;

physical through link shared channel (Physical Sidelink Shared Channel, PSSCH) -reference signal received power (Reference Signal Received Power, RSRP) measurements are made from the decoded SAs, the measurements being above an RSRP threshold.

Step2-4: the proportion (duty cycle) of the remaining selectable resources within the resource selection window is determined.

Step2-5: when the proportion of the current remaining optional resources is greater than or equal to 20%, ending the resource elimination process; and when the proportion of the current residual optional resources is smaller than 20%, the current transceiving node power threshold value is increased (for example, 3dB is increased each time, the initial value of the transceiving node power threshold value is the system configuration), and the resource elimination is carried out again.

Step3: and (3) a primary selection process:

and smoothing the work rate of the residual resources which are not excluded from the resources in the resource selection window, sequencing, and screening the resources with lower smoothing power by 20%.

When only one data packet is transmitted, only one transmission resource is needed to be selected in the method; when a data packet is transmitted twice, the UE can select two resources according to the resources, wherein the two resources are expressed as Tn and Tn+k in the time domain, the limiting condition of the two resources in the time domain is that-15 is less than or equal to 15, and k is not equal to 0. The specific selection method may be to select one according to the above-mentioned resource selection method, and then select the second resource according to other limiting conditions.

NR-V2X resource selection procedure:

the NR-V2X multiplexing LTE-V2X resource selection principle is easy to cause the following problems:

(1) Resource reservation imbalance within a resource selection window:

LTE has the characteristics of service periodicity and semi-static scheduling of resources, and reserved resources in a resource selection window can be considered to be uniformly distributed in a statistical sense; whereas NR-V2X has the characteristics of periodic and aperiodic traffic mix, and semi-static scheduling and dynamic scheduling mix, so that when the trailing edge of the resource selection window is greater than 30 (Tproc 0 is assumed to be 1 here), the reserved resource distribution situation in the two resource selection sub-windows [ T1, 30] and [31, T2] is distinguished. The reserved resources in [ T1, 30] include both periodic reservations and aperiodic reservations; and [31, T2] contains only periodic reservations.

(2) The number of candidate resources does not change as the number of resources that need to be selected changes:

the number of candidate resources is far greater than the number of resources that need to be selected:

for example: the terminal needs to select 1 resource from the resource selection window, the resource selection window is 100 time slots, the number of resources per time slot is 5, and then 500 resources are added in the resource selection window, when x=20, the number of candidate resources is 100 (namely, the product of 50 and 20 percent), the number of candidate resources far exceeds the number of resources needing to be selected, so that the problem is that in order to reach the number of candidate resources, the RSRP threshold needs to be raised for a plurality of times, and the resources reserved by some users with larger interference are put into the candidate resource set, so that the probability of subsequent collision is increased.

The number of candidate resources does not take into account the number of resources that need to be selected:

the number of resources that the terminal needs to select from the resource selection window is variable, while the value of X% in the current protocol is fixed and does not change accordingly according to the change in the number of resources that need to be selected. This may result in the terminal only needing to select 1 resource, but the number of candidate resources far exceeds 1; or the terminal needs to select multiple resources, but the number of candidate resources is small enough to form a sufficient randomization effect.

(3) The way resources are randomly selected does not take into account the traffic delay:

the traditional resource selection adopts a random mode, namely, m transmission resources which are required to be selected by a terminal are randomly selected from a candidate resource set, and the influence of the position of the selected resource in a resource selection window on service delay is not considered.

Specifically, the embodiment of the invention provides a resource selection method and a terminal, which can solve the problems that the existing resource selection process is easy to cause unbalanced resource reservation in a resource selection window, the number of candidate resources is not changed along with the change of the number of resources needing to be selected, and the like, and enhance the effectiveness of a resource selection mechanism.

As shown in fig. 2, an embodiment of the present invention provides a resource selection method, which is applied to a terminal, and specifically includes the following steps:

and step 21, determining a candidate resource set in a resource selection window according to the number m of transmission resources required to be selected by the terminal and/or the resource distribution of the candidate resources in the resource selection window, wherein m is a positive integer.

Here, the candidate resource set in the resource selection window may be determined according to the number m of transmission resources required to be selected by the terminal; the candidate resource set in the resource selection window can also be determined according to the resource distribution of the candidate resource in the resource selection window; the candidate resource set in the resource selection window can also be determined according to the number m of transmission resources required to be selected by the terminal and the resource distribution of the candidate resources in the resource selection window. Here, the candidate resource set includes a plurality of candidate resources.

It should be noted that, step 21 is a process of performing resource exclusion on the resources in the resource selection window, where the excluded resources are candidate resources in the candidate resource set.

And step 22, selecting m transmission resources from the candidate resource set.

Here, when m is equal to 1, one candidate resource is randomly selected from the candidate resource set as the primary transmission resource. When m is greater than 1, randomly selecting one candidate resource from the candidate resource set as an initial transmission resource, randomly selecting a retransmission resource from the candidate resource set, and if the retransmission resource is earlier than the initial transmission resource, exchanging initial transmission and retransmission, namely, retransmitting as initial transmission. For example: if the primary transmission resource is in slot 20 and the retransmission resource is in slot 16, 16 earlier than 20, then the primary transmission and retransmission are interchanged, i.e. the primary transmission resource is in slot 16 and the retransmission resource is in slot 20.

In the above embodiment of the present invention, the number m of transmission resources required to be selected by the terminal and/or the resource distribution of the candidate resources in the resource selection window are used to determine the candidate resource set in the resource selection window, m transmission resources are selected in the candidate resource set, and the candidate resource set is determined by considering at least one of the number m of transmission resources required to be selected by the terminal and the resource distribution of the candidate resources in the resource selection window, thereby solving the problems that the existing resource selection process is easy to cause uneven resource reservation in the resource selection window and the number of candidate resources is not changed with the change of the number of resources required to be selected.

Further, the first preset relationship includes, but is not limited to, any one of the following:

a first item: m1 is more than or equal to min (X% is M, K is M), K is high-level configuration;

the second item: m1 is more than or equal to X% and M;

In the first item of the above embodiment, if the parameter K configured by the network side device through the higher layer signaling is obtained, in the resource exclusion process, in the case that the product of the total number of resources in the resource selection window and the target proportion X% is greater than the product of the parameter K and the number m of transmission resources required to be selected by the terminal: if the number of the candidate resources in the candidate resource set is greater than or equal to the product of the parameter K and the number m of the transmission resources required to be selected by the terminal, stopping the resource elimination process, wherein the rest candidate resources form the candidate resource set; if the number of the candidate resources in the candidate resource set is smaller than the product of the parameter K and the number m of the transmission resources required to be selected by the terminal, continuing to perform a resource elimination process until the number of the candidate resources in the candidate resource set is larger than or equal to the product of the parameter K and the number m of the transmission resources required to be selected by the terminal, so that the number of the candidate resources in the candidate resource set can be changed according to the difference of the number m of the transmission resources required to be selected by the terminal, and the collision probability is reduced.

It should be noted that, the network-side device may be a base station or a core network, where the base station may be a 5G or later base station (e.g., a gNB, a 5G NR NB, etc.), or a base station in other communication systems (e.g., an eNB, a WLAN access point, or other access points, etc.), where the base station may be referred to as a node B, an evolved node B, an access point, a base transceiver station (Base Transceiver Station, a BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a node B, an evolved node B (eNB), a home node B, a home evolved node B, a WLAN access point, a WiFi node, or some other suitable term in the field, and the base station is not limited to a specific technical vocabulary so long as the same technical effect is achieved.

In case the product of the total number of resources in the resource selection window and the target proportion X% is smaller than the product of the parameter K and the number of transmission resources m that the terminal needs to select: if the number of the candidate resources in the candidate resource set is greater than or equal to the product of the total number of the resources in the resource selection window and the target proportion X%, stopping the resource elimination process, wherein the rest candidate resources form the candidate resource set; and if the number of the candidate resources in the candidate resource set is smaller than the product of the total number of the resources in the resource selection window and the target proportion X%, continuing the resource elimination process until the number of the candidate resources in the candidate resource set is larger than or equal to the product of the total number of the resources in the resource selection window and the target proportion X%.

For example: the terminal initiates resource selection at the triggering moment of resource selection, if the number M of transmission resources required to be selected by the terminal is 2, the resources in a resource selection window are determined according to the sensing information of a sending window, and if the resource selection window contains 100 time slots, the number of resources in each time slot is 5, 500 resources (namely M is 500) are totally in the resource selection window; if the higher layer configuration x=20, k=10; and according to the condition that M1 is greater than or equal to min (M X%, M X K) =min (500X 20%, 2X 10) =min (100, 20) =20, M1 is greater than or equal to 20, namely when the number of the remaining candidate resources in the resource selection window is greater than or equal to 20, stopping the resource elimination process, and forming a candidate resource set by the remaining candidate resources in the resource selection window.

In the second item of the above embodiment, if the number of candidate resources in the candidate resource set is greater than or equal to the product of the total number of resources in the resource selection window and the target proportion X%, stopping the resource exclusion process, where the remaining candidate resources constitute the candidate resource set; and if the number of the candidate resources in the candidate resource set is smaller than the product of the total number of the resources in the resource selection window and the target proportion X%, continuing the resource elimination process until the number of the candidate resources in the candidate resource set is larger than or equal to the product of the total number of the resources in the resource selection window and the target proportion X%.

It should be noted that, the target proportion X% is a fixed value agreed by the protocol or a high-layer signaling configuration.

Optionally, the method may further include:

Further, the second preset relationship includes, but is not limited to, any one of the following:

a first item: x is X _m ＝m*X ₁ M is greater than 1;

the second item: x is X _m ＝X ₁ S, m is greater than 1, where S is a higher layer configuration;

third item: presetting a mapping relation;

In the first item of the above embodiment, if the target ratio X when m=1 configured by the network side device through the higher layer signaling is acquired ₁ In the process of resource elimination, if m is 1, the target proportion X corresponding to m can be directly determined ₁ . If m is greater than 1, according to X _m ＝m*X ₁ Determining different target proportions X corresponding to different m values _m 。

For example: the terminal initiates resource selection at the triggering moment of resource selection, if the number m of transmission resources required to be selected by the terminal is 3, the terminal initiates resource selection according to the sendingThe perception information of the window determines resources in a resource selection window, and if the resource selection window contains 100 time slots, and the number of resources in each time slot is 5, 500 resources (namely M is 500) are totally arranged in the resource selection window; when m is 1, the higher layer is arranged at the target ratio X ₁ =5; when m is greater than 1, by X _m ＝m*X ₁ Can determine X ₂ ＝2*5＝10，X ₃ = 3*5 =15, and the like. In this embodiment, m is 3, X ₃ =15; through a first preset relation M1 is more than or equal to X% M, M1 is more than or equal to M X can be determined ₃ And if% =500×15% =75, M1 is greater than or equal to 75, i.e. when the number of remaining candidate resources in the resource selection window is greater than or equal to 75, stopping the resource exclusion process, where the remaining candidate resources in the resource selection window form a candidate resource set.

In the second item of the above embodiment, if the target ratio X when m=1 configured by the network side device through the higher layer signaling is acquired ₁ The parameter S configured by the network side equipment through the high-layer signaling is obtained, and in the resource elimination process, if m is 1, the target proportion X corresponding to m can be directly determined ₁ . If m is greater than 1, according to X _m ＝X ₁ Equation of + (m-1) S, determining different target proportions X corresponding to different m values _m 。

For example: the terminal initiates resource selection at the triggering moment of resource selection, if the number M of transmission resources required to be selected by the terminal is 3, the resources in a resource selection window are determined according to the sensing information of a sending window, and if the resource selection window contains 100 time slots, the number of resources in each time slot is 5, 500 resources (namely M is 500) are totally in the resource selection window; when m is 1, the higher layer is arranged at the target ratio X ₁ =5, if the higher layer configuration S is 3, when m is greater than 1, by X _m ＝X ₁ S can determine X ₂ ＝5+(2-1)*3＝8，X ₃ =5+ (3-1) 3=11, etc. In this embodiment, m is 3, X ₃ =11; through a first preset relation M1 is more than or equal to X% M, M1 is more than or equal to M X can be determined ₃ If% =500×11% =55, then M1 is equal to or greater than 55, i.e. when the number of remaining candidate resources in the resource selection window is greater than or equal to 55, stopping the resource exclusion process, where the remaining candidate resources in the resource selection window form a candidate resource set.

In the third item of the foregoing embodiment, the terminal may determine the target proportion X corresponding to m according to a preset mapping relationship _m Directly determining a target proportion X corresponding to m ₁ . Preferably, the preset mapping relationship may be a preset table mapping relationship, which is not specifically limited herein.

For example: the terminal initiates resource selection at the triggering moment of resource selection, if the number M of transmission resources required to be selected by the terminal is 2, the resources in a resource selection window are determined according to the sensing information of a sending window, and if the resource selection window contains 100 time slots, the number of resources in each time slot is 5, 500 resources (namely M is 500) are totally in the resource selection window; if the preset mapping relationship is as follows:

table 1 preset mapping relationship

m	X _m
		1	5
2	10
		3	20

As can be seen from the above table, m is X mapped when it is 1 ₁ 5; x mapped when m is 2 ₂ 10; mapping X when m is 3 ₃ 20. In this embodiment, m is 2, X ₂ =10; through a first preset relation M1 is more than or equal to X% M, M1 is more than or equal to M X can be determined ₂ The ratio of%500×10% =50, then M1 is greater than or equal to 50, i.e. when the resource selection window remains withinAnd stopping the resource elimination process when the number of the candidate resources is greater than or equal to 50, and forming a candidate resource set by the residual candidate resources in the resource selection window.

Optionally, step 21 may specifically include:

wherein the first preset value is a preset power variation value.

In the above embodiment, according to the resource distribution of the candidate resources in the resource selection window, if the number of candidate resources distributed in the first sub-window meets the first preset condition, the candidate resource set is determined according to the candidate resources distributed in the first sub-window and the candidate resources distributed in the second sub-window, that is, the candidate resources distributed in the first sub-window and the candidate resources distributed in the second sub-window are combined to form the candidate resource set. If the number of the candidate resources distributed in the first sub-window does not meet the second preset condition, updating the power threshold value according to a rule of sequentially increasing a first preset value on the basis of the power threshold value, and changing the number of the candidate resources distributed in the first sub-window in the process of updating the power threshold value until the number of the candidate resources distributed in the first sub-window meets the first preset condition, wherein at the moment, the updated candidate resources distributed in the first sub-window and the updated candidate resources distributed in the second sub-window are combined to form a candidate resource set. Preferably, the power threshold may be an RSPR threshold.

It should be noted that, the first preset value is a preset power variation value, the unit is dB, and preferably, the first preset value may be 3dB, that is, the power threshold value is increased by 3dB each time; the first preset value is not limited to 3dB, and may be set as needed.

Further, the first preset condition includes:

the third preset value is a maximum time slot value of any two resource intervals in a plurality of resources indicated by preset through link control information (Sidelink Control Information, SCI).

Specifically, if the trailing edge of the resource selection window is greater than the difference between the third preset value and Tproc0, the trailing edge of the resource selection window meets the first preset condition, and if the trailing edge of the resource selection window is less than or equal to the difference between the third preset value and Tproc0, the trailing edge of the resource selection window does not meet the first preset condition. As shown in fig. 1, tproc0 is the time interval between time slot n-1 (trailing edge of the sensing window) and time slot n (resource selection trigger time).

The third preset value may be a fixed value 31 or may be set as needed. If the third preset value is 31, any two resources are selected from the plurality of resources indicated by SCI, and the time slots where the two resources are positioned are K1 and K2 respectively, wherein-31 is less than or equal to K1-K2 is less than or equal to 31.

For example: in the case that the first preset value is 3dB, the third preset value is 31, the power threshold value is RSPR threshold value, the front edge of the resource selection window is T1, and the rear edge of the resource selection window is T2, if T2 is greater than 31-Troc 0, the resource selection window [ T1, T2] is divided into a first sub-window [ T1, 31-Troc 0] and a second sub-window [ 32-Troc 0, T2]. If the number of candidate resources distributed in the first sub-window [ T1, 31-Tproc0] does not meet the second preset condition, increasing the RSPR threshold value by 3dB each time until the number of candidate resources distributed in the first sub-window [ T1, 31-Tproc0] meets the second preset condition, stopping the resource elimination process at the moment, and combining the candidate resources distributed in the first sub-window and the candidate resources distributed in the second sub-window to form a candidate resource set.

Further, the second preset condition includes, but is not limited to, any one of the following:

Specifically, if the number of candidate resources in the first sub-window is greater than or equal to the product of the total number of resources in the first sub-window and the target proportion, the number of candidate resources in the first sub-window meets a second preset condition, and the resource elimination process is stopped. To avoid some special cases, the above steps can be optimized as: and if the number of the candidate resources in the first sub-window is greater than or equal to the product of the total number of the resources in the first sub-window and the target proportion, and the number of the candidate resources in the resource selection window is greater than or equal to the product of the total number of the resources in the resource selection window and the target proportion, judging that the number of the candidate resources in the first sub-window meets a second preset condition, and stopping the resource elimination process.

For example: the terminal initiates resource selection at the triggering moment of resource selection, if the resource selection window is [4, 99], tproc0=1, the number of resources per time slot=5, x% =20%; the resource selection window is divided into two sub-windows, a first sub-window [4, 30] and a second sub-window [31, 99], the total number of resources in the first sub-window being 135 and the total number of resources in the second sub-window being 345. After the primary resource selection, the number of candidate resources in the first sub-window is assumed to be 20 resources, and the number of candidate resources in the second sub-window is assumed to be 180 resources; at this time, the number of candidate resources in the first sub-window does not satisfy 20% of the total number of resources in the first sub-window; after raising the RSRP threshold by 3dB, the number of candidate resources in the first sub-window is 30 resources, and the number of candidate resources in the second sub-window is 220 resources; at this time, the number of candidate resources in the first sub-window is greater than 20% of the total number of resources in the first sub-window, and then the process of resource exclusion is ended.

Optionally, step 21 may further include:

wherein the second preset value is a preset power variation value.

Further, the number of candidate resources in the resource selection window is greater than or equal to a product of the total number of resources in the resource selection window and the target ratio.

In the above embodiment, if the trailing edge of the resource selection window is smaller than or equal to the difference value between the third preset value and Tproc0, and the number of candidate resources in the resource selection window is greater than or equal to the product of the total number of resources in the resource selection window and the target proportion, the candidate resources in the resource selection window are combined to form a candidate resource set. And if the trailing edge of the resource selection window is smaller than or equal to the difference value between the third preset value and Tproc0 and the number of the candidate resources in the resource selection window is smaller than the product of the total number of the resources in the resource selection window and the target proportion, updating the power threshold value according to the rule of sequentially increasing the second preset value on the basis of the power threshold value, and changing the number of the candidate resources in the resource selection window in the power threshold value updating process until the number of the candidate resources in the resource selection window is larger than or equal to the product of the total number of the resources in the resource selection window and the target proportion, wherein the candidate resources in the updated resource selection window are combined to form a candidate resource set. Preferably, the power threshold may be an RSPR threshold.

It should be noted that, the second preset value is a preset power variation value, the unit is dB, and the second preset value and the first preset value may be the same power variation value or different power variation values. Preferably, the second preset value may be 3dB, that is, the power threshold value is increased by 3dB each time; the second preset value is not limited to 3dB, and may be set as needed.

Optionally, the step 22 may specifically include:

In the above embodiment, if the number of candidate resources distributed in the third sub-window meets a fourth preset condition, m transmission resources are randomly selected from the candidate resources in the third sub-window. And if the number of the candidate resources distributed in the third sub-window does not meet a fourth preset condition, expanding the trailing edge of the third sub-window backwards by one time slot each time until the number of the candidate resources distributed in the third sub-window meets the fourth preset condition, namely, starting from the first time slot behind the third sub-window, expanding the trailing edge of the third sub-window gradually one time slot by one time slot until the number of the candidate resources distributed in the third sub-window meets the fourth preset condition, and then randomly selecting m transmission resources from the candidate resources in the updated third sub-window.

Further, the fourth preset condition includes:

the number of candidate resources in the third sub-window is greater than or equal to Z, which is a higher layer configuration or quality of service (Quality of Service, QOS) generation, and Z is a positive integer.

Further, the determining a third sub-window in the resource selection window according to the m, the front edge and the back edge of the resource selection window includes:

In the above embodiment, T1 is the front edge of the resource selection window, T2 is the rear edge of the resource selection window, the front edge of the third sub-window is the front edge of the resource selection window, and the value of t1+ (T2-T1)/m is the rear edge of the resource selection window. If the number of candidate resources in [ T1, T1+ (T2-T1)/m ] is greater than or equal to Z, randomly selecting m transmission resources from the candidate resources in [ T1, T1+ (T2-T1)/m ]; if the number of candidate resources in [ T1, T1+ (T2-T1)/m ] is smaller than Z, expanding the value of T1+ (T2-T1)/m gradually backwards from time slot to time slot until the number of candidate resources distributed in the third sub-window is larger than or equal to Z, and then randomly selecting m transmission resources from the updated candidate resources in the third sub-window.

The value of (T2-T1)/m may be an integer taken up or an integer taken down, and is not particularly limited herein.

The foregoing is described in detail by way of a specific embodiment:

for example: the terminal initiates resource selection at the triggering moment of resource selection, if the number m of transmission resources required to be selected by the terminalFor 4, the resource selection window is [4, 80]The first preset value is 3dB, the third preset value is 31, tproc0=1, the number of resources per time slot=3, and the resource selection parameter z=15; when m is 1, the higher layer is arranged at the target ratio X ₁ =5; when m is greater than 1, by X _m ＝m*X ₁ Can determine X ₂ ＝2*5＝10，X ₃ ＝3*5＝15，X ₄ = 4*5 =20, etc.

The trailing edge 80 of the resource selection window is greater than a value of 31-1=30, the resource selection window is divided into a first sub-window [4, 30 ]]And a second sub-window [31, 80 ]]The total number of resources in the first sub-window is 81 and the total number of resources in the second sub-window is 150. Assuming that after the initial resource selection, the number of candidate resources distributed in the first sub-window is 12 resources, and the number of candidate resources distributed in the second sub-window is 60 resources, where the number of candidate resources in the first sub-window is smaller than the total number of resources in the first sub-window ₄ After raising the RSRP threshold by 3dB, the number of candidate resources distributed in the first sub-window is 20 resources, the number of candidate resources distributed in the second sub-window is 80 resources, and at this time, the number of candidate resources distributed in the first sub-window is greater than the total number of resources of the first sub-window by X ₄ And (7) ending the resource elimination process. The (T2-T1)/m is rounded downwards, so that the third sub-window [ T1, T1+ (T2-T1)/m]Corresponding to [4, 23]At this time [4, 23]Containing 12 candidate resources less than 15, will [4, 23]Is shifted back gradually in time slots, after shifting the back edge to 27, i.e. the updated third sub-window [4, 27 ]]15 candidate resources are included, at which point trailing edge movement is stopped. In [4, 27]One of the 15 candidate resources is selected as a primary transmission resource; from [4, 27]And if the retransmission is earlier than the primary transmission, the primary transmission and the retransmission are interchanged.

In the embodiment of the invention, the characteristics of NR-V2X non-periodic service reservation, the quantity of resources required to be selected by the terminal, service time delay and other factors are fully considered, the problems that the resource reservation in a resource selection window is unbalanced and the quantity of candidate resources is not changed along with the change of the quantity of resources required to be selected in the existing resource selection process are solved, and the effectiveness of a resource selection mechanism is enhanced.

As shown in fig. 3, an embodiment of the present invention further provides a terminal 300, including:

a first determining module 310, configured to determine, in a resource selection window, a candidate resource set according to a number m of transmission resources required to be selected by a terminal and/or a resource distribution of candidate resources in the resource selection window;

A first selection module 320, configured to select m transmission resources from the candidate resource set;

wherein m is a positive integer.

Optionally, the first preset relationship includes any one of the following:

M1≥X％*M；

Optionally, the terminal 300 further includes:

and the second determining module is used for determining a target proportion corresponding to the transmission resource number m according to a second preset relation between the transmission resource number and the target proportion.

Optionally, the second preset relationship includes any one of the following:

X _m ＝m*X ₁ m is greater than 1;

X _m ＝X ₁ s, m is greater than 1, where S is a higher layer configuration;

presetting a mapping relation;

Optionally, the first determining module 310 includes:

the first processing unit is used for dividing the resource selection window into a first sub-window and a second sub-window when the trailing edge of the resource selection window meets a first preset condition;

The second processing unit is used for updating the power threshold value according to the rule of sequentially increasing a first preset value on the basis of the power threshold value under the condition that the number of the candidate resources in the first sub-window does not meet a second preset condition until the number of the candidate resources in the first sub-window meets the first preset condition;

a third processing unit, configured to determine, when the number of candidate resources in the first sub-window meets the first preset condition, the candidate resource set according to the candidate resources in the first sub-window and the candidate resources in the second sub-window;

wherein the first preset value is a preset power variation value.

Optionally, the second preset condition includes any one of the following:

Optionally, the first determining module 310 further includes:

a fourth processing unit, configured to update the power threshold value according to a rule of sequentially increasing a second preset value on the basis of the power threshold value, until the number of candidate resources in the resource selection window meets a third preset condition, where the trailing edge of the resource selection window does not meet the first preset condition and the number of candidate resources in the resource selection window does not meet the third preset condition;

a fifth processing unit, configured to determine, according to the candidate resources in the resource selection window, the candidate resource set when the trailing edge of the resource selection window does not meet the first preset condition and the number of candidate resources in the resource selection window meets the third preset condition;

wherein the second preset value is a preset power variation value.

Optionally, the first preset condition includes:

Optionally, the third preset condition includes:

Optionally, the first selecting module 320 includes:

a sixth processing unit, configured to determine a third sub-window in the resource selection window according to the m, the leading edge and the trailing edge of the resource selection window;

a seventh processing unit, configured to, if the number of candidate resources in the third sub-window does not meet a fourth preset condition, sequentially expand a rule of one time slot from a trailing edge of the third sub-window to update the trailing edge of the third sub-window until the number of candidate resources in the third sub-window meets the fourth preset condition;

and an eighth processing unit, configured to select m transmission resources from the candidate resources in the third sub-window if the number of candidate resources in the third sub-window meets the fourth preset condition.

Optionally, the fourth preset condition includes:

Optionally, the sixth processing unit includes:

The terminal in the embodiment of the present invention corresponds to the embodiment of the resource selection method applied to the terminal, and all implementation means in the embodiment of the method are applicable to the embodiment of the terminal, so that the same technical effects can be achieved, and are not repeated herein.

As shown in fig. 4, an embodiment of the present invention further provides a terminal, including:

a processor 41; and a memory 43 connected to the processor 41 through a bus interface 42, the memory 43 storing programs and data used by the processor 41 in performing operations, when the processor 41 calls and executes the programs and data stored in the memory 43, the following processes are performed.

Wherein a transceiver 44 is connected to the bus interface 42 for receiving and transmitting data, in particular under the control of the processor 41:

Selecting m transmission resources from the candidate resource set;

wherein m is a positive integer.

Optionally, the first preset relationship includes any one of the following:

M1≥X％*M；

Optionally, the processor 41 implements the following steps when executing the computer program:

Optionally, the second preset relationship includes any one of the following:

X _m ＝m*X ₁ m is greater than 1;

X _m ＝X ₁ s, m is greater than 1, where S is a higher layer configuration;

presetting a mapping relation;

wherein the first preset value is a preset power variation value.

Optionally, the second preset condition includes any one of the following:

wherein the second preset value is a preset power variation value.

Optionally, the first preset condition includes:

Optionally, the third preset condition includes:

Optionally, the fourth preset condition includes:

The terminal in the embodiment of the present invention corresponds to the above-mentioned embodiment of the resource selection method applied to the terminal, and all implementation means in the above-mentioned embodiment of the method are applicable to the embodiment of the terminal, so that the same technical effects can be achieved, and are not described herein.

It should be noted that in fig. 4, the bus architecture may include any number of interconnected buses and bridges, and in particular one or more processors represented by processor 41 and various circuits of the memory represented by memory 43, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. The transceiver X4 may be a plurality of elements, i.e. comprising a transmitter and a transceiver, providing a unit for communicating with various other apparatus over a transmission medium. The user interface X5 may also be an interface capable of interfacing with an inscribed desired device for a different terminal, including but not limited to a keypad, display, speaker, microphone, joystick, etc. The processor X1 is responsible for managing the bus architecture and general processing, and the memory X3 may store data used by the processor X1 in performing operations.

Those skilled in the art will appreciate that all or part of the steps of implementing the above-described embodiments may be implemented by hardware, or may be implemented by instructing the relevant hardware by a computer program comprising instructions for performing some or all of the steps of the above-described methods; and the computer program may be stored in a readable storage medium, which may be any form of storage medium.

Furthermore, it should be noted that in the apparatus and method of the present invention, it is apparent that the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present invention. Also, the steps of performing the series of processes described above may naturally be performed in chronological order in the order of description, but are not necessarily performed in chronological order, and some steps may be performed in parallel or independently of each other. It will be appreciated by those of ordinary skill in the art that all or any of the steps or components of the methods and apparatus of the present invention may be implemented in hardware, firmware, software, or a combination thereof in any computing device (including processors, storage media, etc.) or network of computing devices, as would be apparent to one of ordinary skill in the art after reading this description of the invention.

The object of the invention can thus also be achieved by running a program or a set of programs on any computing device. The computing device may be a well-known general purpose device. The object of the invention can thus also be achieved by merely providing a program product containing program code for implementing said method or apparatus. That is, such a program product also constitutes the present invention, and a storage medium storing such a program product also constitutes the present invention. It is apparent that the storage medium may be any known storage medium or any storage medium developed in the future. It should also be noted that in the apparatus and method of the present invention, it is apparent that the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present invention. The steps of executing the series of processes may naturally be executed in chronological order in the order described, but are not necessarily executed in chronological order. Some steps may be performed in parallel or independently of each other.

While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.

Claims

1. The resource selection method is applied to the terminal and is characterized by comprising the following steps:

selecting m transmission resources from the candidate resource set; wherein m is a positive integer;

the selecting m transmission resources in the candidate resource set includes:

2. The method of claim 1, wherein the number of candidate resources in the set of candidate resources and the number of resources within the resource selection window at a target proportion x% satisfy a first preset relationship.

3. The method of claim 2, wherein the first predetermined relationship comprises any one of:

M1≥X％*M；

4. The method according to claim 2, wherein the method further comprises:

5. The method of claim 4, wherein the second predetermined relationship comprises any one of:

X _m ＝m*X ₁ m is greater than 1;

X _m ＝X ₁ s, m is greater than 1, where S is a higher layer configuration;

presetting a mapping relation;

6. The method of claim 2, wherein determining the set of candidate resources in the resource selection window based on a resource distribution of the candidate resources in the resource selection window comprises:

wherein the first preset value is a preset power variation value.

7. The method of claim 6, wherein the second preset condition comprises any one of:

8. The method of claim 6, wherein determining the set of candidate resources in the resource selection window based on a resource distribution of the candidate resources in the resource selection window, further comprises:

wherein the second preset value is a preset power variation value.

9. The method according to claim 6 or 8, wherein the first preset condition comprises:

10. The method of claim 8, wherein the third preset condition comprises:

11. The method of claim 1, wherein the fourth preset condition comprises:

12. The method of claim 1, wherein said determining a third sub-window in said resource selection window based on said m, a leading edge and a trailing edge of said resource selection window comprises:

13. A terminal, comprising: a transceiver, a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor when executing the computer program performs the steps of:

selecting m transmission resources from the candidate resource set;

wherein m is a positive integer;

the processor, when executing the computer program, specifically implements the following steps:

14. The terminal of claim 13, wherein the number of candidate resources in the set of candidate resources and the number of resources within the resource selection window at a target proportion x% satisfy a first preset relationship.

15. The terminal of claim 14, wherein the first preset relationship comprises any one of:

M1≥X％*M；

16. The terminal of claim 14, wherein the processor when executing the computer program performs the steps of:

17. The terminal of claim 16, wherein the second preset relationship comprises any one of:

X _m ＝m*X ₁ m is greater than 1;

X _m ＝X ₁ s, m is greater than 1, where S is a higher layer configuration;

presetting a mapping relation;

18. The terminal of claim 14, wherein the processor when executing the computer program performs the steps of:

wherein the first preset value is a preset power variation value.

19. The terminal of claim 18, wherein the second preset condition includes any one of:

20. The terminal of claim 18, wherein the processor when executing the computer program performs the steps of:

wherein the second preset value is a preset power variation value.

21. The terminal according to claim 18 or 20, wherein the first preset condition comprises:

22. The terminal of claim 20, wherein the third preset condition includes:

23. The terminal of claim 13, wherein the fourth preset condition comprises:

24. The terminal of claim 13, wherein the processor when executing the computer program performs the steps of:

25. A terminal, comprising:

wherein m is a positive integer;

the first selection module includes:

26. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the resource selection method according to any of claims 1 to 12.