D2D Exceptional Resource Allocation Across Frequency Mismatch
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Solution Overview
Problem
Current device-to-device (D2D) operation technologies face ambiguity in applying exceptional resources when the serving frequency differs from the D2D operation frequency, leading to uncertainty in resource usage and potential discontinuity of D2D communication.
Innovation Solution
A method for performing D2D operations using exceptional resources by a user equipment (UE) in wireless communication systems, where the UE determines whether to use exceptional resources based on the serving cell or a secondary cell, depending on the frequency of operation, ensuring continuity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If exceptional resources are configured for D2D operation on the same frequency as serving cell communication, then resource allocation is simplified, but the system cannot handle frequency mismatch scenarios between serving cell and D2D operation
Solution Approach 1:
The patent segments the frequency resource handling into two distinct cases: intra-frequency D2D operation (same frequency as serving cell) and inter-frequency D2D operation (different frequency). For intra-frequency operations, exceptional resources are configured directly on the serving cell frequency. For inter-frequency operations, the patent introduces frequency mapping mechanisms where exceptional resources on the serving cell frequency are mapped to the D2D operation frequency, or separate exceptional resource configurations are provided for each frequency. This segmentation resolves the contradiction by simplifying resource allocation within each frequency scenario while enabling adaptability across different frequency scenarios.
2Ease of manufacture
If exceptional resources are configured without considering frequency differences, then configuration process is simplified, but D2D operation continuity cannot be guaranteed when frequency mismatch occurs
Solution Approach 1:
The patent applies preliminary action by pre-configuring exceptional resources on the serving cell frequency before D2D operation begins. When frequency mismatch is detected, the system has already prepared the exceptional resource configuration that can be quickly activated through frequency mapping or alternative configuration mechanisms. This ensures that even when frequency differences arise, the D2D operation can continue without interruption because the resource allocation framework was established in advance, maintaining both configuration simplicity and operational reliability.
3Device complexity
If a single exceptional resource configuration is used for all D2D operations, then resource management is simplified, but resource conflicts may occur when serving cell and D2D frequencies differ
Solution Approach 1:
The patent applies local quality by providing different exceptional resource configurations tailored to specific frequency scenarios. Instead of a uniform configuration approach, the system configures exceptional resources with frequency-specific parameters: for intra-frequency operations, resources are allocated directly on the serving cell frequency; for inter-frequency operations, resources are configured with frequency offset information or mapped to the D2D operation frequency. This localized configuration approach eliminates resource conflicts by ensuring that each frequency scenario has appropriately customized resource allocations while maintaining manageable complexity through standardized configuration procedures.
Data Source
AI summary
Provided are a method for performing a device-to-device (D2D) operation using an exceptional resource by a user equipment (UE) in a wireless communication system, and a UE using the method. The method comprises performing D2D communication in one cell of a first cell having a first frequency and a second cell having a second frequency, wherein the first cell is a serving cell of the UE, and whether the exceptional resource provided by the first cell can be used depends on in which cell of the first cell and the second cell the D2D communication is performed.