D2D Discovery Signal Resource Allocation via Time-Frequency Indexing
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting discovery signals for device-to-device (D2D) communication, particularly in preventing mutual interference between transmission and reception signals in the same frequency band.
Innovation Solution
The method involves using a resource structure for D2D communication with two distinct resource blocks defined by time unit and resource unit indices, where the indices of the second resource block are determined based on the first, allowing UEs to transmit and receive discovery signals at different timings to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs transmit and receive discovery signals in the same frequency band at the same timing, then resource utilization is improved, but mutual interference occurs between transmission and reception signals
Solution Approach 1:
The discovery signal transmission resources are segmented into separate time units (first time unit and second time unit within a discovery resource pool). UEs transmit discovery signals in one time unit and receive discovery signals in another time unit, dividing the resource usage in time domain to avoid mutual interference while maintaining efficient resource utilization.
Solution Approach 2:
The discovery resource pool operates with periodic time units where transmission and reception occur in alternating cycles. This periodic structure allows UEs to systematically switch between transmitting and receiving discovery signals at different timings, preventing interference while ensuring regular resource utilization.
2Speed
If discovery signals are transmitted frequently to improve discovery speed, then discovery performance is improved, but interference between multiple UEs increases
Solution Approach 1:
Multiple UEs are assigned to different time units within the discovery resource pool. This segmentation in time domain allows frequent discovery signal transmissions by different UEs without causing mutual interference, as each UE transmits in its designated time unit while others receive.
Solution Approach 2:
The resource allocation moves from a single-dimension frequency-based approach to a two-dimension time-frequency approach. By introducing time unit indexing alongside resource block indexing, the system can accommodate multiple UEs transmitting at different timings, increasing discovery speed while managing interference through temporal separation.
Data Source
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AI summary
Disclosed is a method for performing, by a device, device-to-device direct communication in a wireless communication system. In particular, the method comprises the steps of: transmitting a device-to-device direct communication signal via a first resource block having a resource structure for device-to-device direct communication at a first point in time; and transmitting the device-to-device direct communication signal via a second resource block having a resource structure for the device-to-device direct communication at a second point in time, wherein the first resource block and the second resource block are defined by a time unit index and a resource unit index, respectively, and wherein the time unit index of the second resource block is determined on the basis of the resource unit index of the first resource block index, and the resource unit index of the second resource block is determined on the basis of the time unit index of the first resource block index.