D2D Signal Reception Frequency Filtering in Wireless Terminals
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Solution Overview
Problem
In device-to-device (D2D) operation, User Equipment (UE) faces challenges in efficiently determining allowed and barred frequencies for D2D signal reception, leading to unnecessary power consumption and potential failure in receiving D2D signals, especially in the RRC idle state, due to the need to monitor across the entire system band without specific frequency information.
Innovation Solution
The method involves receiving system information indicating allowed and barred frequencies for D2D signal reception, allowing the UE to determine feasible frequencies based on supported Public Land Mobile Networks (PLMNs, thereby reducing unnecessary monitoring and power consumption, and enhancing D2D signal reception reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors the D2D signal across the entire system band without frequency information, then the UE can potentially receive D2D signals, but the power consumption increases and the signal reception reliability decreases
Solution Approach 1:
The network performs preliminary actions by determining and broadcasting allowed and barred frequencies for D2D signal reception before the UE attempts to receive D2D signals. This advance preparation enables the UE to skip unnecessary frequency monitoring and directly monitor only the permitted frequencies, thereby reducing power consumption while maintaining reliable signal reception.
Solution Approach 2:
Instead of treating all system band frequencies equally, the patent applies local quality by identifying and designating specific frequencies as 'allowed' for D2D signal reception while marking others as 'barred'. This frequency-specific differentiation enables the UE to concentrate its monitoring efforts only on the locally optimized allowed frequencies, reducing overall power consumption while ensuring reliable reception of D2D signals on permitted frequencies.
2Reliability
If the UE monitors the entire system band for D2D signals, then comprehensive signal coverage is achieved, but the complexity of the monitoring process increases
Solution Approach 1:
The patent segments the entire system band into distinct frequency groups: allowed frequencies where D2D signal reception is permitted and barred frequencies where it is not. This segmentation simplifies the monitoring process by allowing the UE to focus exclusively on the allowed frequency segments, thereby reducing monitoring complexity while maintaining comprehensive coverage of all permitted D2D signals.
Solution Approach 2:
The network performs preliminary classification of frequencies into allowed and barred categories and broadcasts this information to UEs before the monitoring process begins. This preliminary action eliminates the need for UEs to independently analyze and classify all system band frequencies, significantly reducing the complexity of the monitoring process while ensuring reliable detection of D2D signals on appropriate frequencies.
3Measurement precision
If the UE receives frequency information for each PLMN, then the precision of frequency selection is improved, but the amount of information to be processed increases
Solution Approach 1:
The patent applies local quality by providing frequency information specifically tailored to each PLMN that the UE supports, rather than providing universal frequency information for all possible PLMNs. This PLMN-specific approach improves frequency selection precision by ensuring the UE receives accurate allowed and barred frequency lists only for relevant networks, while minimizing the total information quantity by excluding irrelevant PLMN data.
Data Source
AI summary
Provided is a device-to-device (D2D) operation method performed by a terminal in a wireless communication system, and a terminal using same. In the method, received is information indicating a permitted frequency, in which reception of a D2D signal is permitted, and indicating which public land mobile network (PLMN) the permitted frequency is about, and received is a D2D signal on the basis of the information.