Idle Mode Terminal D2D Discovery Resource Allocation
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Solution Overview
Problem
In wireless communication systems, D2D communication efficiency is hindered by the difficulty for idle mode terminals to perform discovery operations due to their inability to transmit signals and the base station's lack of information about their location, leading to inefficient radio resource utilization and interference issues.
Innovation Solution
A method and apparatus that allow idle mode terminals to perform D2D discovery operations by allocating radio resources for discovery signal transmission, enabling them to receive and transmit signals even when transitioning to new base stations, and optimizing resource allocation based on signal strength measurements and synchronization between base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If idle mode terminals are excluded from D2D discovery operations, then base station control complexity is reduced, but D2D communication efficiency and radio resource utilization deteriorate
Solution Approach 1:
Idle mode terminals autonomously select resources for D2D discovery operations without requiring base station allocation. The terminal measures reference signal received power (RSRP) on available resources and selects the resource with the lowest RSRP, enabling self-service operation that reduces base station control complexity while maintaining D2D discovery efficiency.
Solution Approach 2:
The system dynamically adapts its operation mode based on terminal state. When a terminal transitions from connected mode to idle mode, it automatically switches to autonomous resource selection mechanism, allowing the system to maintain high efficiency without increasing base station complexity through dynamic state-based behavior changes.
2Measurement precision
If base station allocates resources for all terminals, then resource allocation precision is improved, but system response time and processing overhead increase
Solution Approach 1:
The resource allocation process is segmented into two distinct mechanisms: base station-based allocation for connected mode terminals (providing precise allocation) and terminal-based autonomous selection for idle mode terminals (providing fast response). This segmentation allows each mechanism to operate optimally without compromising the other, maintaining both precision and speed.
Solution Approach 2:
The system changes the control parameter from base station-centric allocation to terminal-centric selection based on terminal state. Idle mode terminals use RSRP measurement parameters to autonomously select resources, changing the allocation paradigm from top-down to bottom-up, which reduces response time while maintaining adequate allocation precision.
3Loss of energy
If idle mode terminals perform D2D discovery operations autonomously, then radio resource utilization efficiency is improved, but interference management complexity increases
Solution Approach 1:
The system implements feedback mechanisms where idle mode terminals report their selected resources and measurement results to the base station. The base station uses this feedback information to adjust its resource allocation decisions and manage interference, creating a closed-loop system that maintains efficiency while controlling interference management complexity through information exchange.
Solution Approach 2:
The system creates an equipotential environment for resource selection by providing idle mode terminals with the same RSRP measurement capabilities and selection criteria as base station allocation. This equalizes the playing field, allowing autonomous terminal selection to operate fairly within the existing network framework without requiring complex differentiated interference management.
Data Source
AI summary
Methods and apparatuses are provided for Device-to-Device (D2D) communication in a wireless communication system. A terminal receives a D2D communication initiation message from a base station. The terminal measures strength of a received signal on a radio resource predetermined for use in the D2D communication. The terminal transmits a measurement report of the strength of the received signal to the base station. The terminal receives allocation of a resource in the radio resource for transmitting a discovery signal to another terminal for the D2D communication from the base station.