Interference Channel Measurement in D2D Cellular Networks
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Solution Overview
Problem
Existing interference channel measurement schemes in cellular networks fail to accurately measure interference in multi-cell and multi-antenna scenarios, particularly for device-to-device (D2D) communication, as they cannot distinguish interference from individual cellular UEs or their antennas.
Innovation Solution
The method involves configuring cellular UEs with cellular uplink Reference Symbol (RS) related parameters, which are transmitted to D2D capable UEs to measure interference, allowing for accurate interference channel assessment in both multi-cell and multi-antenna environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing interference measurement schemes are used, then implementation is simple, but measurement precision is insufficient in multi-cell and multi-antenna scenarios
Solution Approach 1:
The patent segments the interference measurement process by introducing UE-specific reference signals for each cellular UE and antenna-specific reference signals for each transmission antenna. This segmentation allows the D2D UE to measure interference from individual cellular UEs and antennas separately, achieving precise measurement in multi-cell and multi-antenna scenarios while maintaining manageable complexity through structured signal design.
Solution Approach 2:
The patent applies local quality by providing different reference signal configurations to different D2D UEs based on their specific interference environments. Each D2D UE receives UE-specific RS parameters tailored to measure interference from particular cellular UEs, and antenna-specific RS parameters for specific transmit antennas, enabling localized precise measurement without requiring complex global measurement schemes.
2Productivity
If D2D communication reuses cellular uplink resources, then resource utilization improves, but interference to D2D link increases
Solution Approach 1:
The patent implements feedback by having the D2D UE measure interference using UE-specific and antenna-specific reference signals, then report the measured interference channel information back to the base station. The base station uses this feedback to make informed scheduling decisions about cellular uplink resource allocation, allowing D2D communication to reuse resources while maintaining acceptable interference levels through closed-loop control.
Solution Approach 2:
The patent replaces traditional power-controlled interference management with a signal-processing-based approach using dedicated reference signals. Instead of relying solely on power control mechanisms, the system substitutes a more precise measurement and reporting mechanism that uses UE-specific and antenna-specific reference signals to characterize and manage interference, enabling better coexistence of cellular and D2D communications.
Data Source
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AI summary
The present invention provides a method in a base station ( 10) for determining channel interference in a radio network comprising a device-to-device, D2D, capable UE and the base station serving at least one cellular UE, said method comprising, configuring (1 1 ) the at least one cellular UE with a cellular uplink Reference Symbol, RS, related parameter; transmitting ( 12) the cellular uplink RS related parameter associated with the at least one cellular UE to the D2D capable UE; and obtaining (13) information of interference to the D2D capable UE measured by the D2D capable UE using the cellular uplink RS related parameter. The present invention also provides a corresponding method in D2D capable UE and the devices thereof. This achieves a more accurate the interference channel measurement in multi-cell and multi-antenna scenario.