KR-102963197-B1 - METHOD FOR SELECTING OF SIDELINK GRANT FOR A D2D UE IN A D2D COMMUNICATION SYSTEM AND DEVICE THEREFOR

KR102963197B1KR 102963197 B1KR102963197 B1KR 102963197B1KR-102963197-B1

Abstract

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and apparatus for selecting a sidelink grant for a D2D terminal in a D2D communication system, wherein the method comprises the steps of: setting a resource pool for which the terminal selects a sidelink grant for sidelink data transmission; selecting a first set of sidelink grants for a first sidelink control cycle (SC cycle) from the resource pool to transmit sidelink data; and, if the sidelink data available for the first SC cycle cannot be transmitted using the remaining sidelink grants among the first set of sidelink grants, selecting a second set of sidelink grants for a second SC cycle from the resource pool, wherein the remaining sidelink grants among the first set of sidelink grants are sidelink grants set in one or more subframes within the first SC cycle, starting from the subframe in which the terminal selects the second sidelink grant and extending to the last subframe of the first SC cycle.

Inventors

이선영
이승준

Assignees

타이사 리서치 엘엘씨

Dates

Publication Date: 20260513
Application Date: 20160121
Priority Date: 20150123

Claims (6)

A method for transmitting sidelink data by a terminal (UE; User Equipment) in a wireless communication system, A step of determining whether resource pool information for selecting a sidelink grant is set by a base station; A step of determining whether more sidelink data is available in the sidelink traffic channel (STCH) than can be transmitted during the current sidelink control (SC) cycle; A step of selecting resources for the sidelink grant from the resource pool information based on the fact that the resource pool information for selecting the sidelink grant is set by the base station, and that more sidelink data is available in the STCH than can be transmitted in the current SC cycle; and The method includes the step of transmitting the sidelink data to another UE through the above resources, The above side link grant is for the next SC cycle after the above current SC cycle, and Selecting the resources for the sidelink grant includes selecting the resources for the sidelink grant for the next SC cycle after determining that more sidelink data is available in the STCH than can be transmitted in the current SC cycle. A method in which the above side link grant is considered to be a set side link grant occurring in time intervals starting from the beginning of a first available SC cycle starting at least four subframes after the subframe in which the above side link grant was selected.
In paragraph 1, A method further comprising the step of deleting the side link grant at the end of the next SC cycle.
A method according to claim 1, wherein the UE is a device-to-device UE in mode 2.
As a terminal (UE) that transmits sidelink data in a wireless communication system, Transmitter/receiver; and It includes a processor, and the processor, Determine whether resource pool information for selecting a sidelink grant is set by the base station; Determine whether more sidelink data is available on the sidelink traffic channel (STCH) than can be transmitted during the current sidelink control (SC) cycle; Resource pool information for selecting the sidelink grant is set by the base station, and resources for the sidelink grant are selected from the resource pool information based on the fact that more sidelink data is available in the STCH than can be transmitted in the current SC cycle; and It is configured to transmit the sidelink data to another UE through the above resources, and The above side link grant is for the next SC cycle after the above current SC cycle, and Selecting the resources for the sidelink grant includes selecting the resources for the sidelink grant for the next SC cycle after determining that more sidelink data is available in the STCH than can be transmitted in the current SC cycle. A terminal (UE) that is considered to be a configured sidelink grant occurring in time intervals starting from the beginning of a first available SC cycle starting at least four subframes after the subframe in which the sidelink grant was selected.
In paragraph 4, the above processor is: A terminal (UE) additionally configured to delete the sidelink grant at the end of the next SC cycle.
In paragraph 4, the above UE is a terminal (UE) that is a device-to-device UE in mode 2.

Description

Method for selecting a sidelink grant for a D2D terminal in a D2D communication system and device therefor The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for indicating a ciphering indication for a sidelink wireless bearer in a D2D (Device to Device) communication system. As an example of a wireless communication system to which the present invention can be applied, a 3GPP LTE (3rd Generation Partnership Project Long Term Evolution; hereinafter referred to as "LTE") communication system will be described in detail. Figure 1 is a schematic diagram illustrating the network structure of E-UMTS as an example of a wireless communication system. The E-UMTS (Evolved Universal Mobile Telecommunications System) system is an evolved version of the existing UMTS (Universal Mobile Telecommunications System), and basic standardization work is currently being carried out by 3GPP. In general, E-UMTS can also be referred to as the LTE (Long Term Evolution) system. For detailed technical specifications of UMTS and E-UMTS, refer to Release 7 and Release 8 of the "3rd Generation Partnership Project; Technical Specification Group Radio Access Network," respectively. Referring to FIG. 1, the E-UMTS includes a terminal (User Equipment; UE), a base station (eNode B; eNB), and an access gateway (AG) located at the end of the network (E-UTRAN) and connected to an external network. The base station can simultaneously transmit multiple data streams for broadcast services, multicast services, and/or unicast services. One or more cells exist in a single base station. Cells are configured with one of the bandwidths, such as 1.25, 2.5, 5, 10, 15, or 20 MHz, to provide downlink or uplink transmission services to multiple terminals. Different cells may be configured to provide different bandwidths. The base station controls data transmission and reception for multiple terminals. For downlink (DL) data, the base station transmits downlink scheduling information to inform the corresponding terminal of the time/frequency range for data transmission, encoding, data size, and HARQ (Hybrid Automatic Repeat and reQuest) related information. Additionally, for uplink (UL) data, the base station transmits uplink scheduling information to the corresponding terminal to inform it of the time/frequency range, encoding, data size, and HARQ related information available to the terminal. Interfaces may be used between base stations for transmitting user traffic or control traffic. The Core Network (CN) may be composed of an AG and network nodes for terminal user registration, etc. AG manages the mobility of terminals in units of TA (Tracking Area), which consists of multiple cells. D2D (Device to Device) communication refers to a distributed communication technology that directly transmits traffic between adjacent nodes without utilizing infrastructure such as base stations. In a D2D communication environment, each node, such as a portable terminal, discovers a physically adjacent user device, establishes a communication session, and then transmits traffic. Because this method can resolve traffic overload by distributing traffic concentrated at base stations, D2D communication is attracting attention as a fundamental technology for next-generation mobile communication technologies beyond 4G. For this reason, standard associations such as 3GPP and IEEE have been working to establish D2D communication standards based on LTE-A or Wi-Fi, and Qualcomm has been developing its own D2D communication technology. D2D communication is expected to contribute to increasing the throughput of mobile communication systems and creating new communication technologies. Furthermore, D2D communication can support proximity-based social network services or network game services. Link issues for terminals located in shade zones can be resolved by using D2D links as relays. In this way, D2D technology is expected to provide new services in various fields. D2D communication technologies such as infrared communication, ZigBee, RFID (radio frequency identification), and RFID-based NFC (near field communication) have already been in use. However, since these technologies only support communication between specific objects within a limited distance (about 1m), it is difficult to strictly consider them as D2D communication technologies. Although D2D technology has been described as above, details of a method for transmitting data from multiple D2D terminals using the same resources have not been proposed. The attached drawings, included to provide an understanding of the present invention and incorporated into the application and constituting a part thereof, are intended to illustrate embodiments of the present invention and to explain the principles of the present invention together with the description in the specification. FIG. 1 is a diagram showing the network structure of E-UMTS (Evolved Universal Mobile Telecomm