CN112512124A - Method for determining side link transmission resource - Google Patents
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims abstract description 44
- 238000012216 screening Methods 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims description 8
- 230000007717 exclusion Effects 0.000 claims description 7
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- 238000010586 diagram Methods 0.000 description 7
- 230000008447 perception Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000002567 autonomic effect Effects 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0248—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal dependent on the time of the day, e.g. according to expected transmission activity
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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
- H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
本发明提出了一种确定侧行链路传输资源的方法：包括如下步骤：接收PSCCH监听配置信息；根据PSCCH监听配置信息和资源选择方案，对选择窗内所有候选资源进行筛选，所述资源选择方案为随机资源选择、基于部分感知和基于全感知三者其中的一种；排除不合适的候选资源后，在剩余的候选资源中随机选择一个资源进行侧行链路传输。与现有技术相比，本发明根据PSCCH监听配置信息和资源选择方案的确定，对选择窗内所有候选资源进行不同方式的筛选，在自适应地调整PSCCH的监听频率方式基础上，可进一步的节省功耗，且不影响传输效率。
The present invention proposes a method for determining sidelink transmission resources, comprising the following steps: receiving PSCCH monitoring configuration information; screening all candidate resources in a selection window according to the PSCCH monitoring configuration information and a resource selection scheme, and selecting the resources The scheme is one of random resource selection, partial sensing based and full sensing based; after excluding inappropriate candidate resources, one of the remaining candidate resources is randomly selected for sidelink transmission. Compared with the prior art, according to the determination of PSCCH monitoring configuration information and resource selection scheme, the present invention screens all candidate resources in the selection window in different ways, and on the basis of adaptively adjusting the PSCCH monitoring frequency mode, it can further Save power consumption without affecting transmission efficiency.
Description
Technical Field
The invention relates to the technical field of sidelink, in particular to a method for determining sidelink transmission resources.
Background
When a User Equipment (UE) communicates through a sidelink (sidelink), if there is no coverage of a base station or only partial coverage, the UE may adopt an autonomous resource selection mode, and a basic procedure is as shown in fig. 1. In a time slot
The arrival of a data packet triggers resource selection, or the resource reselection is triggered due to the previous transmission failure, and the UE is in the time slot
A previous period of timeAnd sensing in the window, and determining whether the resource to be selected (referred to as candidate resource) is available according to the sensing result. Candidate resources are located within a selection window (selection window)
And (4) showing. The range of the selection window is
The starting point and the ending point depend on Packet Delay Budget (Packet Delay Budget), UE processing capability, subcarrier spacing configuration, and the like. The range of the sensing window is
Its starting and ending points depend on higher layer configuration, UE processing capability, and subcarrier spacing configuration, etc.
In the autonomous resource selection mode, in order to select an appropriate time-frequency resource to avoid a conflict with resources of other UEs, the UE needs to continuously sense, that is, full-sensing (full-sensing), which is generally called "always-on", specifically, the UE needs to sense all timeslots within a sensing window, that is, monitor a Physical Sidelink Control Channel (PSCCH) on all timeslots and demodulate the PSCCH to obtain Sidelink Control Information (SCI), obtain resource reservation indication Information (i.e., an instantaneous-frequency resource position, a resource reservation period, a priority, etc.), and determine candidate resource resources in the selection window according to a Reference Signal Reception Power (RSRP) measurement result
Whether or not exclusion is required. The purpose of PSCCH listening is to obtain resource occupancy or reservation of other UEs.
In the autonomous resource selection mode, full sensing helps to avoid resource conflict and ensure certain transmission reliability, but the UE needs to sense continuously, which results in higher power consumption.Simulations demonstrate that full sensing accounts for the largest of the total power consumption of the UE. However, in the scenario of people-Vehicle communication (P2V), as well as in the scenario of public safety and some business use cases (e.g., a bracelet), the UE needs to save power consumption and improve endurance. Considering the feature of periodic transmission of a part of data packets, one way to save power consumption is partial-sensing (partial-sensing), and the UE only needs to sense a part of time slots within the sensing window, i.e. listen to the PSCCH on the part of time slots, which are called partial-sensing slots. Candidate resources
Corresponding to a partially perceived time slot of
In the time slot
The resource reservation period value is subtracted. If there are multiple possible resource reservation period values in the resource pool (resource pool), each candidate resource
Corresponding to a plurality of partially aware time slots. As shown in fig. 1.
In order to further reduce power consumption, the UE may also adopt a scheme of random resource selection (random resource selection) to randomly select a resource from the selection window. The random resource selection scheme does not need to sense any time slot in a sensing window, namely, PSCCH monitoring is not carried out on any time slot, and no resource exclusion process is carried out, so that resource conflict can be caused, and the random resource selection scheme is only suitable for the condition that low-capability UE cannot sense or the condition that reliability requirements are not enough and the load is low.
In the prior art, each sub-channel on each timeslot in the resource pool has one PSCCH candidate (PSCCH candidate), and as the bandwidth of the resource pool increases, the number of PSCCH candidates to be monitored further increases, which greatly increases the power consumption of the UE. Therefore, one possible approach is to adaptively adjust the listening frequency of the PSCCH, for example, to reduce the number of times the PSCCH is listened when the traffic is small. Further, consider that
1) In the autonomous resource selection mode, the UE needs to monitor PSCCH in the resource sensing process and calculate RSRP to acquire the resource occupation or reservation condition of other UE;
2) each PSCCH is associated with a Physical Sidelink Shared Channel (PSCCH), and the PSCCH are located in the same time slot, that is, the PSCCH is not transmitted in a time slot in which the PSCCH is not transmitted;
the invention provides a method for determining side link transmission resources.
Disclosure of Invention
The present invention is directed to a method for determining sidelink transmission resources to overcome the deficiencies of the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the application discloses a method for determining side link transmission resources, which comprises the following steps: the method comprises the following steps:
(1) receiving PSCCH monitoring configuration information;
(2) screening all candidate resources in a selection window according to PSCCH monitoring configuration information and a resource selection scheme, wherein the resource selection scheme is one of random resource selection, partial sensing based and full sensing based;
(3) and after the unsuitable candidate resources are excluded, randomly selecting one resource from the remaining candidate resources for the sidelink transmission.
Preferably, the PSCCH monitoring configuration information in step (1) includes indication information of a PSCCH search space, the indication information of the PSCCH search space includes monitoring time information of a PSCCH, and the monitoring time information of the PSCCH includes a PSCCH monitoring period.
Preferably, the PSCCH listening period may be one or more.
Preferably, the resource selection scheme is random resource selection, and the method for screening all candidate resources in the selection window in step (2) is to exclude all candidate resources except the PSCCH monitoring time in the selection window.
Preferably, the resource selection scheme is based on partial perception, and the screening of all candidate resources in the selection window in step (2) includes the following sub-steps:
(2.1) judging whether the time slot of the candidate resource in the selection window is at the PSCCH monitoring time;
(2.2) if not, excluding the candidate resource; otherwise, judging whether part of sensing resources corresponding to the candidate resources in the sensing window are at the PSCCH monitoring time;
(2.3) if all the sensing resources corresponding to the candidate resources are not in the PSCCH monitoring time, the candidate resources do not need to be excluded; otherwise, if any one of all the partial sensing resources corresponding to the candidate resource is at the PSCCH monitoring time, sensing the partial sensing resource at the PSCCH monitoring time, and judging whether the candidate resource needs to be eliminated according to the sensing result.
Preferably, the partial perceptual resource may be a time domain resource.
Preferably, the time domain resource is a time slot or a group of symbols in the time slot.
Preferably, the resource selection scheme is based on full sensing, and the method for screening all candidate resources in the selection window in the step (2) is to sense only the resources at the PSCCH monitoring time in the sensing window; and judging whether the candidate resources need to be eliminated or not according to the sensing result.
Preferably, the method for judging whether the candidate resource needs to be excluded according to the sensing result is to monitor and demodulate a PSCCH, acquire resource reservation information, measure RSRP, and if the reserved resource exists, the reserved resource and the candidate resource are overlapped, and the RSRP is higher than a preset threshold, the candidate resource needs to be excluded; otherwise, no exclusion is required.
The invention has the beneficial effects that: the invention provides a method for determining side-link transmission resources, which is characterized in that all candidate resources in a selection window are screened in different modes according to PSCCH monitoring configuration information and the determination of a resource selection scheme, and the power consumption can be further saved on the basis of adaptively adjusting the monitoring frequency mode of the PSCCH without influencing the transmission efficiency.
The features and advantages of the present invention will be described in detail by embodiments in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a diagram of a basic process for autonomic resource selection;
figure 2 is a diagram of the PSCCH search space;
FIG. 3 is a schematic illustration of the resource selection scheme of the present invention being random resource selection;
FIG. 4 is a schematic illustration of the resource selection scheme of the present invention as being based on partial perception;
FIG. 5 is a schematic diagram of the resource selection scheme of the present invention as based on full perception.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Referring to FIG. 1, the selection window has
One time slot, the first one uses
Is shown as follows
For one to use
Indicating that there is a slot in eachSeveral candidate resources, for candidate resources in fig. 1
It is shown that,
indicating that the candidate resource is located in the time slot
， 
Representing a plurality of sub-channels (sub-channels) in succession, candidate resources
The number of sub-channels occupied in the frequency domain is issued by a high layer, and the time domain occupies one time slot.
Suppose there is a resource pool
One possible resource reservation period value is one candidate resource
At least 2 partial sensing time slots are corresponded, as shown by black boxes in the figure, and the partial sensing time slots are respectively time slots
Minus period
Time slot
Minus period
。
It is necessary to know that within the selection window
In each time slot, a plurality of candidate resources exist, and each candidate resource at least corresponds to
The partial sensing time slot. That is, the UE needs to be within the sensing window
Each sub-interval is sensed and contains
Partial-sensing slots (partial-sensing slots).
Since the UE does not need to be aware of all timeslots within the window (much larger than that of the UE)
PSCCH monitoring is carried out, and only partial sensing time slot(s) ((ii))
One) performs PSCCH listening, thus saving power consumption.
Referring to fig. 2, fig. 2 is a diagram of a PSCCH search space. In fig. 2, 2 PSCCH search spaces are configured in the resource pool, search space # 1 indicates that the monitoring period of the PSCCH is 5 time slots, and search space #2 indicates that the monitoring period of the PSCCH is 3 time slots. And the sending end UE obtains the monitoring position of each PSCCH candidate according to the indication information of the PSCCH searching space, and each block of a filling line in the graph represents one PSCCH candidate.
Referring to FIG. 3, candidate resources
Corresponding to the 2 partial sensing time slots, the first is not at the PSCCH monitoring time, and the second is at the PSCCH monitoring time. UE needs to sense the second part of sensing time slot and judges whether to eliminate the candidate resource according to the sensing result
. If the PSCCH is detected on the second partial sensing time slot and the PSCCH indicates that other UE reserves the candidate resource
And if the RSRP measurement value is greater than the specified threshold, then the candidate resource is considered
Not usable, and need to be excluded.
Referring to fig. 3, fig. 3 is a schematic diagram of the resource selection scheme of the present invention being random resource selection. According to the invention, if the resource selection scheme is random resource selection, all candidate resources in the selection window are screened in a manner of excluding all candidate resources except the PSCCH monitoring time in the selection window.
In fig. 3, 5 time slots in the selection window are not at the PSCCH listening time, so all candidate resources on the 5 time slots are excluded, and the UE selects only candidate resources on the remaining time slots.
Referring to fig. 4, fig. 4 is a schematic diagram of the resource selection scheme of the present invention based on partial perception. According to the invention, if the resource selection scheme is based on partial perception, the screening of all candidate resources in the selection window comprises the following sub-steps: judging whether the time slot of the candidate resource in the selection window is at the PSCCH monitoring time or not; if not, excluding the candidate resource; otherwise, judging whether part of sensing resources corresponding to the candidate resources in the sensing window are at the PSCCH monitoring time; if all the sensing resources corresponding to the candidate resources are not in the PSCCH monitoring time, the candidate resources do not need to be excluded; otherwise, if any one of all the partial sensing resources corresponding to the candidate resource is at the PSCCH monitoring time, sensing the partial sensing resource at the PSCCH monitoring time, and judging whether the candidate resource needs to be eliminated according to the sensing result.
In FIG. 4, the candidate resource
The total number of 2 partial sensing time slots corresponds to, as shown by a black frame indicated by a black arrow in the figure, the first partial sensing time slot is not at the PSCCH monitoring time, and the second partial sensing time slot is at the PSCCH monitoring time, so that the UE needs to sense the second partial sensing resource at the PSCCH monitoring time, and judges whether to eliminate the candidate resource according to the sensing result
. Specifically, if the UE detects the PSCCH on the second partial sensing timeslot, the UE acquires resource reservation information by demodulating the PSCCH, performs RSRP measurement, and according to an indication of the resource reservation information, if there is a reserved resource and the reserved resource and a candidate resource overlap, and an RSRP measurement value is higher than a preset threshold, the candidate resource needs to be excluded; otherwise, no exclusion is required.
Referring to fig. 5, fig. 5 is a schematic diagram of the resource selection scheme of the present invention based on full sensing. According to the invention, if the resource selection scheme is based on full sensing, all candidate resources in the selection window are screened in a manner of sensing only the resources at the PSCCH monitoring moment in the sensing window; and judging whether the candidate resources need to be eliminated or not according to the sensing result.
In fig. 5, the PSCCH listening period is 2 time slots, that is, 50% of the time slots in the sensing window are at the PSCCH listening time, so that the UE only needs to sense 50% of the time slots, and determine whether to exclude the candidate resource according to the sensing result. Specifically, if the UE detects the PSCCH on the 50% of the time slots, the PSCCH is demodulated to obtain resource reservation information, and RSRP measurement is performed, and according to the indication of the resource reservation information, if there is a reserved resource, and the reserved resource and the candidate resource are overlapped, and the RSRP measurement value is higher than a preset threshold, the candidate resource needs to be excluded; otherwise, no exclusion is required.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method of determining sidelink transmission resources: the method is characterized by comprising the following steps:
(1) receiving PSCCH monitoring configuration information;
(2) screening all candidate resources in a selection window according to PSCCH monitoring configuration information and a resource selection scheme, wherein the resource selection scheme is one of random resource selection, partial sensing based and full sensing based;
(3) and after the unsuitable candidate resources are excluded, randomly selecting one resource from the remaining candidate resources for the sidelink transmission.
2. The method of claim 1, wherein the PSCCH listening configuration information in step (1) includes information indicating a PSCCH search space, the information indicating the PSCCH search space includes information indicating a listening time of the PSCCH, and the information indicating the listening time of the PSCCH includes a PSCCH listening period.
3. The method for determining sidelink transmission resources as claimed in claim 2, wherein the PSCCH listening period may be one or more.
4. The method as claimed in claim 2 or 3, wherein the resource selection scheme is random resource selection, and the step (2) of filtering all candidate resources in the selection window is to exclude all candidate resources except PSCCH listening time in the selection window.
5. A method as claimed in claim 2 or 3, wherein the resource selection scheme is based on partial sensing, and the step (2) of screening all candidate resources in the selection window comprises the sub-steps of:
(2.1) judging whether the time slot of the candidate resource in the selection window is at the PSCCH monitoring time;
(2.2) if not, excluding the candidate resource; otherwise, judging whether part of sensing resources corresponding to the candidate resources in the sensing window are at the PSCCH monitoring time;
(2.3) if all the sensing resources corresponding to the candidate resources are not in the PSCCH monitoring time, the candidate resources do not need to be excluded; otherwise, if any one of all the partial sensing resources corresponding to the candidate resource is at the PSCCH monitoring time, sensing the partial sensing resource at the PSCCH monitoring time, and judging whether the candidate resource needs to be eliminated according to the sensing result.
6. The method of claim 5, wherein the determining whether to exclude the candidate resource according to the sensing result is to monitor and demodulate PSCCH, obtain resource reservation information, perform RSRP measurement, and if there is a reserved resource and the candidate resource are overlapped and RSRP is higher than a preset threshold, then to exclude the candidate resource; otherwise, no exclusion is required.
7. The method of claim 5, wherein the partial perceptual resource is a time domain resource.
8. The method of claim 7, wherein the time domain resource is a time slot or a set of symbols within a time slot.
9. The method as claimed in claim 2 or 3, wherein the resource selection scheme is based on full sensing, and the method for screening all candidate resources in the selection window in step (2) is to sense only the resources at the PSCCH monitoring time in the sensing window, and determine whether to exclude the candidate resources according to the sensing result.
10. The method of claim 9, wherein the determining whether to exclude the candidate resource according to the sensing result is to monitor and demodulate PSCCH, obtain resource reservation information, perform RSRP measurement, and if there is a reserved resource and the candidate resource are overlapped and RSRP is higher than a preset threshold, then to exclude the candidate resource; otherwise, no exclusion is required.
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| CN113099479A (en) * | 2021-04-01 | 2021-07-09 | 之江实验室 | Method for determining perception moment in direct communication |
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