User Equipment D2D Gap Configuration via Time Hopping
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Solution Overview
Problem
In LTE D2D communication, user equipment must switch carriers to monitor signals from other operators, which can lead to delayed detection due to unknown timing of D2D resources, potentially blocking cellular communication.
Innovation Solution
User equipment sets D2D gaps based on configuration information from the base station, using a time hopping pattern to allocate time intervals for monitoring D2D signals in a different frequency, allowing efficient detection without disrupting cellular communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user equipment switches carrier to monitor D2D signals from other operators, then D2D signal detection capability is improved, but cellular communication is blocked and detection timing is delayed
Solution Approach 1:
The patent segments the time domain by introducing measurement gaps that periodically separate cellular communication time from D2D signal monitoring time. This allows the user equipment to switch carriers without blocking cellular communication continuously, thereby resolving the contradiction between detection capability and timing delay.
Solution Approach 2:
The patent implements periodic measurement gaps at predetermined intervals within each cell period. This periodic action enables the user equipment to monitor D2D signals from other operators at specific time windows while maintaining cellular communication during other periods, eliminating continuous carrier switching and its associated delays.
2Measurement precision
If measurement gap is extended to improve D2D signal monitoring, then detection accuracy is improved, but cellular communication performance deteriorates
Solution Approach 1:
The patent applies local quality by configuring measurement gaps only in specific time periods (gaps between subframes) rather than continuously. This allows D2D signal monitoring to be performed with sufficient accuracy during designated intervals while cellular communication maintains high performance during active transmission periods, thus resolving the contradiction between detection accuracy and communication productivity.
Solution Approach 2:
The patent dynamically configures measurement gaps based on the cell period structure, adjusting the timing and duration of gaps to optimize both D2D detection and cellular communication. The measurement gaps are positioned to not interfere with critical cellular communication slots, thereby achieving dynamic balance between the two functions.
3Adaptability or versatility
If carrier switching is performed frequently to monitor different operators' signals, then D2D communication versatility is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by having the base station configure measurement gap patterns in advance before D2D signal monitoring begins. This pre-configuration eliminates the need for real-time carrier switching decisions, thereby improving adaptability to multiple operators while reducing the complexity of carrier switching management through standardized, pre-planned time windows.
Solution Approach 2:
The measurement gap structure acts as an intermediary mechanism that coordinates between cellular communication and D2D monitoring functions. Instead of direct, complex carrier switching management, the measurement gap serves as a mediator that automatically provides time slots for D2D monitoring, simplifying the overall system complexity while maintaining multi-operator versatility.
Data Source
AI summary
User equipment to be used in a communication system supporting D2D communication includes a setting unit that receives D2D gap configuration information from a base station, and sets a D2D gap based on the D2D gap configuration information; and a communication unit that monitors a D2D signal in a different frequency using the D2D gap, wherein the D2D gap that is set based on the D2D gap configuration information is a time interval with a predetermined time length in a time domain, the time interval being allocated based on a time hopping pattern.