CN108024266A - Resource method for removing based on monitoring in a kind of V2X communications - Google Patents
Resource method for removing based on monitoring in a kind of V2X communications Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 14
- 238000005259 measurement Methods 0.000 claims abstract description 25
- 230000007717 exclusion Effects 0.000 claims abstract description 8
- 238000012935 Averaging Methods 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims description 24
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
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- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
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Abstract
The present invention proposes the resource method for removing based on monitoring in a kind of V2X communications, comprises the following steps：A, part candidate's single sub-frame resource is deleted according to RSRP measurement results；B, for remaining each candidate's single sub-frame resource Rx,y, will can be expressed as in audit windowIn the subframe of (j is nonnegative integer) subchannel x+k (k=0 ..., LsubCH1) RSSI measured on carries out linear averaging and obtains Ex,y, further according to the PSSCH resource reservation interval of other UE obtained, resource location, RSRP measurement results and the resource reservation interval of itself, to Ex,yIt is adjusted processing and obtains E 'x,y；C, remaining candidate's single sub-frame resource is according to E 'x,yOrder arrangement from small to large, retains the preset ratio * M of queue front portiontotalA resource.The present invention, using the occupation condition obtained, more rationally can be ranked up the priority of candidate resource when carrying out resource exclusion.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a resource exclusion method based on monitoring in V2X communication.
Background
In V2X communication of LTE R14 release, the mode4 transmission mode is a mode in which a UE autonomously selects transmission resources. When the UE performs mode4 transmission, in order to reduce resource collision, the UE needs to monitor the surrounding communication environment (sensing), predict the resource occupation of other UEs according to the sensing result, and exclude the resource occupied by other UEs and greatly interfered from the candidate resources according to a certain rule, which may be summarized as follows.
First, several concepts of V2X communication of LTE R14 release are introduced:
PSSCH-RSRP (reference signal received power, hereinafter RSRP): represents the average received power of re (resource element) carrying the reference signal on the psch (physical downlink shared channel).
S-RSSI (received-signal strength indicator, hereinafter RSSI): represents the average received power of SC-FDMA symbols in one subframe over one subchannel bandwidth.
LsubCH: in one sub-frame forThe number of subchannels for psch transmission is determined by higher layers.
Prsvp_TX/Prsvp_RX: the resource reservation interval for PSSCH transmission is determined by higher layers.
prioTX/prioRX: the priority information for PSSCH transmission is determined by higher layers.
Cresel: the number of reserved subframes for PSSCH transmission is determined by the physical layer.
Candidate single subframe resource Rx,y: sub-frameIs continuously L insubCHA set of subchannels with subchannel sequence number x + j, where j is 0subCH-1。
When the UE receives a higher layer request for resource exclusion based on monitoring in a subframe n, according to the measurement results (including RSRP and RSSI) of the subframes n-1000, n-999, …, n-1 (excluding the subframes occupied by UE transmission), the time interval [ n + T [ (+ ])1,n+T2]Inner (T)1And T2Depending on the UE implementation, T1≤4，20≤T2T less than or equal to 100 selected by UE2Should meet the delay requirement) all the candidate list subframe resources perform the following operations:
(1) will gather SAInitializing the resource into a union set of all candidate single sub-frames, and counting the number of the candidate single sub-frames as Mtotal。
(2) From the set SADeleting a single subframe resource R satisfying the following conditionx,y：
-UE in subframeReceiving a SCI format 1, wherein the fields of "Resource reservation" and "Priority" respectively indicate the value Prsvp_RXAnd prioRX。
-falseLocalized sub-frameReceiving the same SCI format 1, and the subframe and resource block set indicated by the SCI format 1 andoverlap, j-0, 1, …, Cresel-1，Pstep＝100。
-the RSRP measurement result corresponding to the SCI format 1 is higher than a higher layer configured threshold
(3) If S in the setAThe number of the residual candidate single subframe resources is less than 0.2. MtotalThen the threshold is increased by 3dB and step (2) is repeated.
(4) For set SAOf each of the remaining candidate single subframe resources Rx,yWill be denoted as in sub-frame n-1000, n-999, …, n-1(j is a non-negative integer) of subchannels x + k (k 0...., L.) in a subframesubCH-1) the RSSI measured on the line is averaged, defining the average as Ex,y。
(5) Will gather SAHas a minimum E inx,yCandidate single subframe resource R of valuesx,yMove to set SB. This step is repeated until set SBThe number of the candidate single subframe resources in (2) is more than or equal to 0.2. Mtotal。
(6) Definition of SCFor all not in the set SBIn the set consisting of candidate single subframe resources, when PSSCH resource selection is performed, the UE should notify the upper layer of the excluded set SCThe candidate single subframe resource of (1).
The method firstly excludes partial candidate single subframe resources according to RSRP in steps (2) and (3), then carries out priority ranking on the residual resources according to the receiving power value from small to large in steps (4) and (5), and preferentially reserves the candidate single subframe resources with smaller receiving power of the first 20%. The receiving power value according to the sorting is an average value obtained by averaging the RSSI on the resource corresponding to the candidate resource in the listening window with the minimum transmission cycle 100ms in the V2X communication as a statistical time interval. However, simply using 100ms as the statistical time interval may cause the following 2 problems.
For the purpose of problem analysis, first, a mathematical relationship between RSRP and RSSI is described, and since the pscch in the V2X communication is always transmitted on several consecutive sub-channels, the two have the following relationship according to the definition of RSRP and RSSI over the corresponding bandwidth W:
on the left side of the formula (1), S represents the subchannel set corresponding to the bandwidth W, RSSIsThe RSSI measurements for sub-channel s in the set are represented. To the right of equation 1, U denotes the set of users with all psch transmission bandwidths overlapping with the bandwidth W, RSRPuRSRP measurement, N, representing users u in the setuAnd the number of RBs representing the part of the bandwidth of the PSSCH transmitted by the user u and the bandwidth W. Equation (1) shows that the RSSI measurements are approximately equal to the addition of the corresponding RSRP measurements, approximately from the following 3 aspects: the measurement of RSRP and RSSI depends on the implementation of UE, and certain errors exist; the RSSI measurement result may include the power of pscch (physical downlink control channel); influence of in-band-emission.
In the following, transmission of three users, UE a, UE B, and UE C, is taken as an example to perform problem analysis, without considering measurement errors, possible PSCCH power, and in-band-interference effects, that is, the measurement result of RSSI is equal to the addition of the measurement results of corresponding RSRP. The number of subchannels used for UE transmission is LsubCHThe number of RBs corresponding to the bandwidth is N, and the length of the listening window is 1000ms (i.e., for RS)The number of subframes J on the SI average is 10), the RSRP values of UE B and UE C measured by UE a are equal and are denoted as RSRP.
Problem 1: as shown in FIG. 1, assume resource reservation interval P of listening UE Arsvp_TX200ms, for the candidate resource R in the selection windowx,y1And Rx,y2The RSSI measured at the corresponding resource positions of the two in the listening window respectively comes from the transmission of UE B (resource reservation interval P)rsvp_RX100ms, slash identification) and UE C (resource reservation interval P)rsvp_RX200ms, horizontal line identification). E is obtained according to step (4) of the above method and equation (1)x,y1And Ex,y2Respectively as follows:
in the result Ex,y1Value is Ex,y22 times the value, thereby candidate resource Rx,y1Will be lower than the candidate resource Rx,y2. However, in fact, the interference experienced by UE a when transmitting using these two resources is the same, and therefore the candidate resource R isx,y1And candidate resource Rx,y2Should have the same priority.
Problem 2: as shown in FIG. 2, assume resource reservation interval P of listening UE Arsvp_TX200ms, for candidate resource R in the listening windowx,y1And Rx,y2The RSSI measured at the corresponding resource positions of the two in the listening window respectively comes from the transmission of UE B (resource reservation interval P)rsvp_RX200ms, slash identification) and UE C (resource reservation interval P)rsvp_RX200ms, horizontal line identification). E obtained according to step (4) step4 of the above method and formula (1)x,y1And Ex,y2Respectively as follows:
in the result Ex,y1Value equal to Ex,y2Value, thereby candidate resource Rx,y1And candidate resource Rx,y2Will have the same priority. But in fact UE A uses Rx,y1The transmission collides with the transmission of UE B, and R is usedx,y2The transmission does not collide with the transmission of UE C, so the candidate resource Rx,y2Should have higher priority than the candidate resource Rx,y1。
In summary, in the resource exclusion method proposed by the current LTE R14 release, the step (4) of ordering the resources according to the received power does not consider the influence of the resource reservation interval and the resource location on the resource collision, and needs to be further improved.
Disclosure of Invention
The invention provides a resource exclusion method based on monitoring in V2X communication, which comprises the following steps:
a, deleting partial candidate single subframe resources according to the RSRP measurement result;
b, for each remaining candidate single subframe resource Rx,yThe following calculations were performed:
will be able to be represented in the listening window asE is obtained by performing linear averaging on the RSSI measured on the subchannel x + k in the subframex,yWherein x and y are candidate single subframe resources Rx,yJ is a non-negative integer, k is 0subCH-1，LsubCHThe number of sub-channels used for PSSCH transmission in one sub-frame, the number of sub-frames used for averaging is denoted as J, and the sub-frame in which the monitoring window is located can be represented asIs marked as P for Ex,yObtained by'x,y：
Wherein,pfor a single PSSCH, RSRP in the set PpRSRP measurement value, N, for PSSCH ppFor PSSCH p and candidate resource Rx,yNumber of RBs in overlap, σpCalculated according to the following formula:
Prsvp_RX,preserving an interval, P, for the resources of PSSCH Prsvp_TXReserving intervals, P, for monitoring resources of a UEstepIs the minimum transmission period in the V2X communication;
c, the residual candidate single subframe resources are according to E'x,yArranged in order from small to large, keeping a preset proportion M at the front part of the queuetotalA resource, MtotalIs the total number of candidate single subframe resources.
Preferably, when the above method is used in LTE R14 release, step a is still implemented by using the existing method, that is:
when the UE is in the subframe of the monitoring windowWhen an SCI format 1 is received, if the following two conditions are met, the candidate single subframe resource R is deletedx,y: firstly, the RSRP measurement result corresponding to the SCI format 1 is higher than that of the higher layerA configured threshold; two, in the sub-frameThe same SCI format 1 is received, and the set of subframes and resource blocks indicated by the SCI format 1 andoverlap, n-0, 1, …, Cresel-1，CreselReserved number of subframes for transmitting PSSCH for UE, where m is a subframeThe subframe number of (2);
if the number of the remaining candidate single subframe resources is less than the preset ratio MtotalThen the threshold is increased by 3dB and the above determination is repeated.
Preferably, P isstepThe preset ratio is 20% as 100.
The monitoring UE processes the result based on RSSI measurement according to the acquired PSSCH resource reservation interval, resource position, RSRP measurement result of other UE and the resource reservation interval of the monitoring UE, so as to acquire a more reasonable result. When the resource is eliminated, the priority of the candidate resource can be sorted more reasonably by using the acquired resource occupation condition.
Drawings
FIG. 1 is a diagram of a scenario of problem 1 of the background art;
fig. 2 is a scene diagram of problem 2 of the background art.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; it should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention is an improvement over step (4) of the prior art method of the background art based on equation (1) in the background art. In this embodiment, the transmission of three users, UE a, UE B, and UE C, is still taken as an example for explanation, and the measurement error, the possible PSCCH power, and the influence of in-band-emission are not considered, that is, the measurement result of RSSI is equal to the addition of the measurement results of corresponding RSRP.
In this example, steps (1) to (3) are the same as those in the background art, and steps (4) and (5) are as follows:
(4) for set SAOf each of the remaining candidate single subframe resources Rx,yWill be denoted as in sub-frame n-1000, n-999, …, n-1(j is a non-negative integer) of subchannels x + k (k 0...., L.) in a subframesubCH-1) linear averaging of the measured RSSI to obtain Ex,yThe number of subframes counted for averaging is J, and the subframe where the listening is in subframe n-1000, n-999, …, n-1 can be represented as J(j is a non-negative integer) and the set consisting of all PSSCHs is denoted as P, and Ex,yObtained by'x,y：
Wherein,pfor a single PSSCH, RSRP in the set PpRSRP measurement for PSSCHp, NpIs PSSCHp and candidate resource Rx,yNumber of RBs in overlap, σpCalculated according to the following formula:
Prsvp_RX,pan interval is reserved for the resources of the psschhp in set P.
(5) Will gather SAHas a minimum E 'of'x,yCandidate single subframe resource R of valuesx,yMove to set SB. This step is repeated until set SBThe number of the candidate single subframe resources in (2) is more than or equal to 0.2. Mtotal。
The resource exclusion after using the above steps is analyzed as follows:
with respect to FIG. 1, the prior protocol approach yields E as described in the backgroundx,y1And Ex,y2Respectively as follows:
this example pair Ex,y1And Ex,y2And (3) adjusting:
for Ex,y1The subframe with 10 PSSCHs in the listening window can be expressed asAnd the corresponding sigma values are all 1/2, so the adjustment results in:
for Ex,y2The subframe with 5 PSSCHs in the listening window can be expressed asAnd the corresponding sigma values are all 0, so the following results are obtained after the treatment:
it can be seen that the embodiment has been adjusted to Ex,y1Become half of the original, Ex,y2Unchanged, both have the same priority, the corresponding UE A uses the candidate resource Rx,y1And Rx,y2The interference is the same, which accords with the actual situation.
With respect to FIG. 2, the prior protocol approach yields E as described in the backgroundx,y1And Ex,y2Respectively as follows:
this embodiment is respectively for Ex,y1And Ex,y2The following adjustments were made:
for Ex,y1The subframe with 5 PSSCHs in the listening window can be expressed asAnd the corresponding sigma values are all 0, so the adjustment results in:
for Ex,y2The subframe with 5 PSSCHs in the listening window can be expressed asAnd the corresponding sigma values are all 1, so the adjustment results in:
it can be seen that the embodiment has been adjusted to Ex,y1Invariable, Ex,y2Becomes 0, candidate resource Rx,y2Has a higher priority than Rx,y1Using the candidate resource R corresponding to the UE Ax,y2The transmission is not interfered, and the method accords with the actual situation.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A resource exclusion method based on interception in V2X communication, characterized in that the method comprises the following steps:
a, deleting partial candidate single subframe resources according to the RSRP measurement result;
b, for each remaining candidate single subframe resource Rx,yThe following calculations were performed:
will be able to be represented in the listening window asOfThe RSSI measured on the subchannel x + k in the frame is linearly averaged to obtain Ex,yWherein x and y are candidate single subframe resources Rx,yJ is a non-negative integer, k is 0subCH-1，LsubCHThe number of sub-channels used for PSSCH transmission in one sub-frame, the number of sub-frames used for averaging is denoted as J, and the sub-frame in which the monitoring window is located can be represented asIs marked as P for Ex,yObtained by'x,y：
<mrow> <msubsup> <mi>E</mi> <mrow> <mi>x</mi> <mo>,</mo> <mi>y</mi> </mrow> <mo>&prime;</mo> </msubsup> <mo>=</mo> <msub> <mi>E</mi> <mrow> <mi>x</mi> <mo>,</mo> <mi>y</mi> </mrow> </msub> <mo>-</mo> <munder> <mo>&Sigma;</mo> <mrow> <mi>p</mi> <mo>&Element;</mo> <mi>P</mi> </mrow> </munder> <msub> <mi>&sigma;</mi> <mi>p</mi> </msub> <mo>&times;</mo> <mfrac> <mrow> <msub> <mi>RSRP</mi> <mi>p</mi> </msub> <mo>&times;</mo> <msub> <mi>N</mi> <mi>p</mi> </msub> <mo>&times;</mo> <mn>12</mn> </mrow> <mrow> <mi>J</mi> <mo>&times;</mo> <msub> <mi>L</mi> <mrow> <mi>s</mi> <mi>u</mi> <mi>b</mi> <mi>C</mi> <mi>H</mi> </mrow> </msub> </mrow> </mfrac> <mo>,</mo> </mrow>
Wherein,pfor a single PSSCH, RSRP in the set PpRSRP measurement value, N, for PSSCH ppIs PSSCH p and candidate resource Rx,yNumber of RBs in overlap, σpCalculated according to the following formula:
c is a non-negative integer and C is a non-negative integer,
Prsvp_RX,preserving an interval, P, for the resources of PSSCH Prsvp_TXReserving intervals, P, for monitoring resources of a UEstepIs the minimum transmission period in the V2X communication;
c, the residual candidate single subframe resources are according to E'x,yArranged in order from small to large, keeping a preset proportion M at the front part of the queuetotalA resource, MtotalIs the total number of candidate single subframe resources.
2. The method of claim 1, wherein step a is implemented as follows:
when the UE is in the subframe of the monitoring windowWhen an SCI format 1 is received, if the following two conditions are met, the candidate single subframe resource R is deletedx,y: firstly, the RSRP measurement result corresponding to the SCI format 1 is higher than the upper layer configured threshold; two, in the sub-frameThe same SCI format 1 is received, and the set of subframes and resource blocks indicated by the SCI format 1 andoverlap, n-0, 1, …, Cresel-1，CreselReserved number of subframes for transmitting PSSCH for UE, where m is a subframeThe subframe number of (2);
if the number of the remaining candidate single subframe resources is smallAt a predetermined ratio MtotalThen the threshold is increased by 3dB and the above determination is repeated.
3. The method according to claim 1 or 2, characterized in that:
Pstepthe preset ratio is 20% as 100.
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| CN112020148B (en) * | 2019-05-29 | 2022-08-26 | 华为技术有限公司 | Communication method and device |
| WO2020243971A1 (en) * | 2019-06-06 | 2020-12-10 | 广东欧珀移动通信有限公司 | Resource selection method in internet of vehicles system and user equipment thereof |
| US12041585B2 (en) | 2019-06-06 | 2024-07-16 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Resource selection method in internet of vehicles system and user equipment thereof |
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| WO2021155848A1 (en) * | 2020-02-06 | 2021-08-12 | Jrd Communication (Shenzhen) Ltd | Pre-emption management in sidelink transmission systems |
| WO2022077467A1 (en) * | 2020-10-16 | 2022-04-21 | 华为技术有限公司 | Method and apparatus for resource determination |
| CN112840708B (en) * | 2021-01-14 | 2024-03-26 | 北京小米移动软件有限公司 | Communication method, device and storage medium |
| CN112840708A (en) * | 2021-01-14 | 2021-05-25 | 北京小米移动软件有限公司 | Communication method, device and storage medium |
| WO2022188112A1 (en) * | 2021-03-11 | 2022-09-15 | 北京小米移动软件有限公司 | Communication method, communication device, and storage medium |
| WO2023010552A1 (en) * | 2021-08-06 | 2023-02-09 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | User equipment and resource selection method in sidelink communication |
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