KR-102963170-B1 - Resource allocation method and device for a sidelink communication system

KR102963170B1KR 102963170 B1KR102963170 B1KR 102963170B1KR-102963170-B1

Abstract

The present disclosure relates to a pre-5G or 5G communication system provided to support a higher data transfer rate than a 4G communication system such as LTE (Long Term Evolution). A resource allocation method performed by a user device (UE: user equipment) is provided. The resource allocation method includes the operation of determining a target resource set for data transmission in a first time unit, the operation of selecting a first resource that is temporally earliest in the target resource set, wherein the first resource is located in a second time unit, the operation of determining whether the first resource is available between the first time unit and the second time unit, and the operation of determining whether data is transmitted on the first resource based on whether the first resource is available.

Inventors

우 민
선 페이페이
저우 미아오
왕 이

Assignees

삼성전자 주식회사

Dates

Publication Date: 20260511
Application Date: 20200203
Priority Date: 20190201

Claims (16)

In a method of a terminal in a wireless communication system, A step of initially setting a set of resources containing all candidate resources; A step of excluding a resource from the set of resources based on the measured RSRP (reference signal received power) being higher than a threshold value; If the number of remaining resources in the set of the above resources is less than a preset value, the step of increasing the threshold value and performing the initial setting step; A step of confirming that the resources for sidelink transmission have been re-evaluated based on the set of the above resources; and A method of a terminal characterized by including the step of selecting a resource other than the re-evaluated resource for the sidelink communication.
In paragraph 1, The method further includes the step of receiving configuration information for a resource pool for the sidelink communication from a base station, and A method of a terminal characterized in that the set of resources having all the above candidate resources is initially configured based on the above configuration information.
In paragraph 1, The above-mentioned preset value is determined based on information regarding a portion (portion) of the resources included in the set of resources for all the above-mentioned candidate resources, and A method of a terminal characterized in that the above information is determined based on the priority of transmission associated with the terminal.
In paragraph 3, A method of a terminal characterized in that the above transmission includes at least one of PSSCH (physical sidelink shared channel) transmission or PSCCH (physical sidelink control channel) transmission.
In paragraph 4, The above RSRP is measured based on the received PSCCH, and The received PSCCH above indicates the excluded resources, and A method of a terminal characterized in that the above threshold is determined based on the priority of transmission associated with the terminal and the priority indicated by the received PSCCH.
In paragraph 1, A method of a terminal characterized by further including the step of performing a channel access procedure for a channel based on the selected resource above.
In paragraph 6, The step of performing the above channel connection procedure is, A step of sensing a time interval associated with the selected resource based on an energy sensing threshold; and A method of a terminal characterized by including a step of checking whether the channel is idle based on a sensed result for the above time interval.
In Paragraph 7, A method of a terminal characterized by further including the step of performing the sidelink communication on the selected resource based on the availability of the selected resource when it is confirmed that the channel is idle.
In a terminal of a wireless communication system, Transmitter/receiver; and A terminal characterized by comprising a control unit that initializes a set of resources having all candidate resources, excludes resources from the set of resources based on the measured RSRP (reference signal received power) being higher than a threshold value, increases the threshold value if the number of resources remaining in the set of resources is less than a preset value, performs the initialization step, confirms that a resource for sidelink transmission has been re-evaluated based on the set of resources, and selects a resource other than the re-evaluated resource for the sidelink communication.
In Paragraph 9, The above control unit controls the transceiver to receive configuration information for a resource pool for the sidelink communication from the base station, and A terminal characterized in that the set of resources having all of the above candidate resources is initially configured based on the above configuration information.
In Paragraph 9, The above-mentioned preset value is determined based on information regarding a portion (portion) of the resources included in the set of resources for all the above resources, and A terminal characterized in that the above information is determined based on the priority of transmissions associated with the terminal.
In Paragraph 11, A terminal characterized in that the above transmission includes at least one of PSSCH (physical sidelink shared channel) transmission or PSCCH (physical sidelink control channel) transmission.
In Paragraph 12, The above RSRP is measured based on the received PSCCH, and The received PSCCH above indicates the excluded resources, and A terminal characterized in that the above threshold is determined based on the priority of transmission associated with the terminal and the priority indicated by the received PSCCH.
In Paragraph 9, A terminal characterized in that the above control unit performs a channel access procedure for a channel based on the above-described selected resource.
In Paragraph 14, A terminal characterized by the above control unit sensing a time interval associated with the selected resource based on an energy sensing threshold, and determining whether the channel is idle based on the sensed result for the time interval.
In paragraph 15, A terminal characterized in that the above control unit controls the transceiver to perform the sidelink communication on the selected resource based on whether the selected resource is available when the channel is confirmed to be idle.

Description

Resource allocation method and device for a sidelink communication system The present disclosure relates to the field of communication technology. More specifically, the present disclosure relates to a method and apparatus for allocating resources for a sidelink communication system. In the LTE (Long Term Evolution)-based V2X (Vehicle to Everything) system of the 3GPP standardization organization, the User Equipment (UE) first transmits a Physical Sidelink Control Channel (PSCCH) to indicate information such as the time-frequency resources occupied by the data channel scheduled by the Modulation and Coding Scheme (MCS), and then transmits data through the data channel. In the case of an LTE-based Device-to-Device (D2D)/V2X system, the aforementioned Scheduling Assignment (SA) is also referred to as a PSCCH, and the data channel is also referred to as a Physical Sidelink Shared Channel (PSSCH). The unit of frequency resource allocation is a sub-channel, and a single sub-channel contains consecutive Physical Resource Blocks (PRBs). The number of PRBs is determined by upper-layer signaling. Resources for a device may occupy one or more consecutive sub-channels. In the case of a user device (UE), since data is generated periodically over a certain period, the user device can periodically reserve resources at a certain reservation interval. Each piece of data can be transmitted repeatedly K times, and accordingly, K resources must be reserved (where K is greater than or equal to 1), to prevent a situation where some devices cannot receive data due to the limitations of half-duplex operation. In LTE V2X transmission mode 4, LTE V2X user devices select resources based on autonomous methods. Based on information detected in the detection window, the user device may select K resources that it can occupy and continuously reserve them for a period C. A method for detecting resources is to obtain the PSSCH scheduled by the PSCCH for the user device based on the decoding of the PSCCH of other user devices. The received power of the user device (e.g., Physical Sidelink Shared Channel-Reference Signal Received Power (RSRP)) may be measured, and resource occupancy and/or reservation is determined based on said received power and the reservation interval of the PSCCH. Another method for detecting resources is to determine resource occupancy and/or reservation based on received energy (e.g., Sidelink-Receive Signal Strength Indicator (S-RSSI)). For resources for subframe x within a selected window, the aforementioned received energy refers to the average value of the received energy of the same sub-channel resources for subframe xP rsvp ·j within a detection window, for example, where P rsvp is the reservation interval and j is an arbitrary integer. By using the two detection methods described above, the user device can avoid using the same resources as other devices for transmission. FIG. 1 illustrates an exemplary flowchart of an autonomous resource allocation method for an LTE V2X user device according to the relevant technology. It is assumed that resource selection is performed in subframe n and the reservation interval for the user device's currently reserved resources is P A. The user device can select resources within the selected window [n+T 1 , n+T 2 ] and can continue to reserve resources for a period C with an interval of P A. T 1 and T 2 depend on the implementation of the user device, for example, T 1 ≤ 4, 20 ≤ T 2 ≤ 100. T 1 depends on the processing delay time of the user device from the time resources are selected until SA signaling and data can be transmitted, and T 2 depends primarily on the delay characteristics that the current traffic can tolerate. First, in operation 101 of FIG. 1, all resources in the selected window are set to set SA A. Subsequently, in operation 102, according to the correctly decoded SA, if the SA indicates that all resources are still reserved after subframe n, the receive power of the data channel scheduled by the SA is measured, and if the receive power exceeds the corresponding threshold Th 1 , some of the candidate resources of SA are excluded. In particular, if the receive power exceeds the corresponding threshold Th 1 , the resources Y reserved after subframe n are unavailable according to the SA. The aforementioned threshold Th 1 may be jointly determined by the priority of the device performing resource allocation and the priority indicated by the correctly decoded SA. R x,y is a single subframe resource of the selected window [n+T 1 , n+T 2 ], located in subframe y, and includes one or more consecutive sub-channels starting from sub-channel x, When the PRB for is duplicated with the PRB of resource Y, R x,y is unavailable for device A. That is, R x,y is excluded from set SA . Here, j is 0, 1, ..., C-1, and C is the number of periods for which device A intends to reserve resources at the current P A interval. Next, in operation 103, it is determined whether the ratio of th