CoMP Reference Signal Timing Allocation for Interference Avoidance
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Solution Overview
Problem
In cellular radio communication systems, particularly in LTE-A, there is a challenge in providing high data rates to User Equipments (UEs) located at cell boundaries due to interference from neighboring cells, and existing methods struggle to distinguish sub-frames for CSI-RS transmission among multiple cells without colliding with paging, synchronization, and PBCH signals.
Innovation Solution
A method and apparatus for transmitting and receiving reference signal transmission information in a CoMP scheme, where a Central Control Apparatus (CCA) allocates CSI-RS resources and transmits timing information to User Equipment (UE) to avoid collisions with paging, synchronization, and PBCH signals, allowing UEs to effectively measure channel status from multiple cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are transmitted in all sub-frames, then channel estimation accuracy is improved, but interference with paging, synchronization, and PBCH signals occurs
Solution Approach 1:
The patent segments the sub-frames into different types (MBSFN sub-frames with further division into first and second sub-sets) to differentiate reference signal transmission behavior. This segmentation allows channel estimation in specific sub-frames while avoiding interference in others, resolving the contradiction between measurement precision and signal interference.
Solution Approach 2:
The patent introduces dynamic configuration where the network can flexibly indicate which sub-frames contain reference signals through higher-layer signaling. This dynamic approach allows the system to adapt reference signal transmission to avoid conflicts with paging, synchronization, and PBCH signals while maintaining channel estimation accuracy when needed.
2Productivity
If CoMP scheme is implemented to provide services to UEs at cell boundaries, then system throughput is improved, but complexity of managing reference signals from multiple cells increases
Solution Approach 1:
The patent segments reference signals from different cells into distinct types (first reference signal from serving cell, second reference signal from neighboring cell) with different transmission patterns. This segmentation simplifies UE processing by providing clear distinctions between reference signals from different cells, reducing management complexity while enabling CoMP benefits.
Solution Approach 2:
The patent employs preliminary configuration through higher-layer signaling that informs UEs in advance about reference signal transmission patterns, sub-frame configurations, and resource allocations from multiple cells. This preliminary action reduces real-time processing complexity and enables UEs to efficiently manage reference signals from multiple cells for CoMP operations.
Data Source
AI summary
An apparatus and method for transmitting/receiving reference signal transmission information in a cellular radio communication system using a Cooperative Multi-Point (CoMP) scheme is provided. In the reference signal transmission information transmission method, a Central Control Apparatus (CCA) transmits measurement set information related to a measurement set including at least one reference signal resource unit through which a reference signal is transmitted, and reference signal transmission timing information including information related to a timing at which the reference signal is transmitted to a User Equipment (UE), and transmits reference signal non-transmission timing information including information related to a timing at which the reference signal is not transmitted through the reference signal resource unit to the UE.