User Terminal Resource Switching for D2D Discovery Detection
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Solution Overview
Problem
In non-collision-type D2D discovery, user terminals allocated the same discovery signals cannot detect each other due to the half-duplex limitation, where they cannot receive signals while transmitting, leading to inefficient resource allocation and detection failures.
Innovation Solution
User terminals switch the location of their transmission resources periodically based on pre-defined rules, allowing them to detect each other by altering their resource allocation in subsequent periods, ensuring that even those allocated the same resources initially can transmit at different times, thereby avoiding collisions and enabling mutual detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If user terminals are allocated the same discovery signal resources at the same time, then resource allocation efficiency is improved, but detection capability deteriorates due to half-duplex limitation
Solution Approach 1:
The patent applies periodic action by having user terminals switch between different discovery signal transmission resources in alternating time periods. Terminals transmit on one resource during one period and switch to another resource in the next period, enabling them to detect signals from terminals that would otherwise be blocked by half-duplex constraints. This periodic resource switching resolves the contradiction by maintaining efficient resource utilization while enabling reliable detection.
2Device complexity
If discovery signal resources are allocated statically, then system complexity is reduced, but detection reliability deteriorates due to collision-type limitations
Solution Approach 1:
The patent introduces dynamics by transitioning from static resource allocation to dynamic resource switching. User terminals are assigned resources in a semi-static manner initially, but then dynamically switch between different resources in alternating periods according to predetermined rules. This dynamic switching enables terminals to overcome detection limitations while maintaining relatively simple control mechanisms, resolving the contradiction between complexity and reliability.
Data Source
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AI summary
The present invention is designed so that adequate mutual detection is made possible in non-collision-type D2D discovery during inter-terminal direct communication. A user terminal can execute inter-terminal direct communication, and has a receiving section that receives initial allocation location information of a resource for transmitting a discovery signal for use in inter-terminal direct communication, and a control section that switches the location of the resource to transmit the discovery signal, per period, in accordance with a pre-rule.