Cell Reselection Priority for D2D in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, particularly in public safety networks, device-to-device (D2D) operations are hindered due to cell reselection methods that prioritize frequencies without D2D resources over those with D2D resources, leading to potential unavailability of D2D services in critical situations.
Innovation Solution
A cell reselection method where a user equipment (UE) receives configuration information indicating frequencies and an implicit highest priority application indicator, allowing it to prioritize frequencies necessary for D2D operations, ensuring D2D resources are considered as having the highest priority during cell reselection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal follows conventional cell reselection priority rules, then it selects cells based on frequency priority, but it cannot perform D2D operation when D2D frequency has lower priority than non-D2D frequency
Solution Approach 1:
The patent changes the priority parameter of frequencies dynamically based on D2D operation requirements. When D2D operation is needed, the frequency carrying D2D resources is assigned the highest priority regardless of its original priority value, enabling the terminal to select the appropriate cell for D2D operation
Solution Approach 2:
The patent applies preliminary action by pre-defining that the frequency with D2D resources shall have highest priority when D2D operation is required. This preliminary rule ensures that when D2D operation becomes necessary, the terminal can immediately apply this priority rule without complex real-time decision making
2Productivity
If the terminal prioritizes frequencies with higher priority values, then it follows standard cell reselection procedure, but it may select frequencies without D2D resources leading to inability to perform D2D operation
Solution Approach 1:
The patent modifies the frequency priority parameter dynamically. Instead of using static priority values, the system sets the priority of D2D frequency to the highest value when D2D operation is required, ensuring both efficient cell reselection and reliable D2D service availability
Data Source
AI summary
Provided are a cell reselection method performed by a terminal in a wireless communication system and a terminal using the method. The method comprises receiving configuration information indicating a plurality of frequencies and an implicit highest priority application indicator, wherein, when the indicator allows application of the implicit highest priority, a frequency which should be camped on for a device-to-device (D2D) operation from among the plurality of frequencies is regarded as having the highest priority.