Phase Compensation Reference Signals in 5G CoMP
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Solution Overview
Problem
In wireless communication systems, especially in 5G NR-SS CoMP environments, phase drift during transmissions leads to performance degradation due to the lack of effective phase compensation, resulting in interference and reduced communication efficiency among network operating entities sharing spectrum resources.
Innovation Solution
The implementation of Phase Compensation Reference Signals (PCRS) is introduced, where base stations and UEs transmit PCRS when phase drift exceeds a threshold, allowing for synchronization adjustments in channel phases to maintain coherent transmissions across coordinated multipoint groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase compensation reference signals (PCRS) are transmitted frequently to compensate for phase drift, then phase synchronization accuracy is improved, but signaling overhead and system complexity increase
Solution Approach 1:
The patent implements dynamic PCRS transmission by configuring different PCRS periodicities for different UEs based on their mobility states and channel conditions. Highly mobile UEs receive more frequent PCRS updates while stationary UEs use less frequent updates, optimizing the balance between synchronization accuracy and signaling overhead
Solution Approach 2:
The system changes the transmission parameters of PCRS dynamically by adjusting the periodicity and frequency based on detected phase drift thresholds and UE mobility patterns, allowing adaptive optimization of phase compensation without fixed high overhead
2Reliability
If PCRS transmission is implemented continuously to maintain phase coherence, then communication reliability is improved, but network latency and resource consumption increase
Solution Approach 1:
The patent implements periodic PCRS transmission with configurable periodicity values, where PCRS are sent at regular intervals rather than continuously. The periodicity is adjusted based on phase drift detection, ensuring reliable phase compensation while minimizing unnecessary transmissions that would increase latency
Solution Approach 2:
The system employs self-service mechanisms where UEs autonomously detect phase drift conditions and trigger PCRS requests when thresholds are exceeded, reducing the need for continuous network-controlled PCRS transmissions and thereby reducing latency
3Stability of the object's composition
If phase compensation is applied aggressively to eliminate all phase drift, then transmission coherence is improved, but interference from coordinated base stations increases due to excessive synchronization adjustments
Solution Approach 1:
The patent implements feedback-based phase compensation where base stations monitor phase drift levels and adjust PCRS transmission strategies accordingly. When phase drift remains within acceptable thresholds, aggressive compensation is avoided, thereby reducing unnecessary synchronization adjustments that could cause interference in CoMP environments
Solution Approach 2:
The system applies differentiated phase compensation strategies to different spatial regions and UE groups, where only specific base stations transmit PCRS to particular UEs based on local phase drift conditions, rather than universal aggressive compensation across all CoMP participants, thereby minimizing overall interference
Data Source
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AI summary
Phase compensation in a new radio (NR) shared spectrum (NR-SS) coordinated multipoint (CoMP) environment is discussed. A base station may synchronize the phase between one or more additional base stations in a coordinated multipoint (CoMP) group serving one or more user equipments (UEs). This first synchronizing is performed prior to a current transmission opportunity between the CoMP group and the UEs. During transmission, a UE will sent a phase compensation reference signal (PCRS) to help with adjusting a phase drift that exceeds a predetermined threshold. The PCRS may be triggered by a signal from the base station or may be sent routinely by the UE. The UEs will transmit PCRS after each subframe, which the base stations use to adjust the phase.