D2D Resource Pool Configuration for LTE Interference
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Solution Overview
Problem
Current resource-pool configurations for device-to-device (D2D) communication in LTE/LTE-A networks face challenges in enabling simultaneous D2D and WAN communication due to limited RF chain availability, leading to inefficiencies and interference issues, especially in out-of-coverage scenarios where UEs need to switch between different communication modes.
Innovation Solution
The implementation of multiple resource-pool configurations using different signaling methods, such as time and frequency domain parameters, allows for adaptable resource allocation, enabling efficient D2D communication by prioritizing resource usage and minimizing interference through flexible configuration options that can be dynamically adjusted based on UE coverage status and network instructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a UE uses a single resource-pool configuration for D2D communication, then the configuration can be simple and easy to implement, but it cannot efficiently support both in-coverage and out-of-coverage scenarios simultaneously
Solution Approach 1:
The patent implements multiple resource-pool configurations that can be dynamically selected based on UE coverage status. The network can configure different resource pools for in-coverage and out-of-coverage scenarios, and UEs can switch between them based on their current state, making the system adaptive without requiring each individual configuration to be complex
Solution Approach 2:
The patent divides the resource pool into multiple separate configurations (first resource-pool configuration and second resource-pool configuration) with different parameters optimized for different scenarios. This segmentation allows each configuration to be simple and optimized for its specific use case while the system as a whole provides comprehensive coverage support
2Adaptability or versatility
If a UE switches RF chain between downlink and uplink frequencies for D2D reception, then D2D communication can be enabled, but simultaneous D2D and WAN reception becomes impossible due to limited RF chains
Solution Approach 1:
The patent segments resource allocation into different time-frequency resources for D2D and WAN communications. By configuring separate resource pools with different time-frequency parameters, the system allows UEs to perform D2D reception during allocated D2D resources without needing to switch RF chains from WAN downlink frequencies, enabling simultaneous operation
Solution Approach 2:
The patent introduces time and frequency domain parameters as additional dimensions for resource allocation. By spreading D2D resources across different time slots and frequency bands, the system creates dimensional separation between D2D and WAN communications, allowing parallel operation without RF chain conflicts
3Ease of manufacture
If resource allocation is fixed for D2D communication, then implementation is simple, but spectrum efficiency deteriorates when traffic conditions change
Solution Approach 1:
The patent implements semi-static resource-pool configurations that can be updated by the network based on traffic conditions. While the configurations remain relatively stable for efficient implementation, they can be dynamically adjusted by the network to optimize spectrum efficiency when traffic patterns change, balancing simplicity and performance
Data Source
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AI summary
A method for configuring and allocating radio resource to terminals for device to device communication or discovery is described. The method includes configuring a resource pool used by terminals during device to device communication according to corresponding parameters, setting up multiple resource pools with different configuration, configuring or signaling the configurations of different resource pools through different methods, selecting the suitable resource pool configuration for device to device operation.