Decoupled CSI-RS Power Control for Heterogeneous Network Interference
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Solution Overview
Problem
In wireless communication networks, especially in heterogeneous networks, interference between base stations and user equipment (UE) causes performance degradation due to mismatched power control and reference signal levels, leading to inaccurate open loop power control and increased interference.
Innovation Solution
The implementation of techniques for measuring channel state information reference signals (CSI-RS) and performing open loop power control, including determining distinct CSI-RS and signaling parameters to UEs, allows for accurate power control and interference mitigation by decoupling reference signal configurations from physical cell identifiers, enabling coordinated multipoint operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signal configurations are coupled with physical cell identifiers in heterogeneous networks, then network compatibility and simplicity are maintained, but power control accuracy deteriorates and interference increases due to mismatched power control and reference signal levels between macro and pico base stations
Solution Approach 1:
The patent segments the reference signal configuration from the physical cell identifier, allowing independent configuration of CSI-RS parameters (such as resource elements, bandwidth, and power levels) for each transmission point regardless of PCI. This enables macro and pico base stations to have customized reference signal settings optimized for their specific deployment scenarios, resolving the contradiction between maintaining network simplicity and achieving accurate power control in heterogeneous networks.
Solution Approach 2:
The patent introduces new configurable parameters for CSI-RS that are independent of PCI, including reference signal power, resource element allocation, and bandwidth configuration. By changing the parameter structure to allow independent control of reference signal characteristics separate from cell identification, the system achieves both simplified deployment (no complex PCI-reference signal mapping) and improved power control accuracy (customized parameters for each transmission point).
2Ease of operation
If multiple transmission points use the same physical cell identifier for coordinated multipoint operations, then network simplification and UE compatibility are improved, but interference mitigation capability deteriorates due to inability to distinguish reference signals from different transmission points
Solution Approach 1:
The patent applies local quality by allowing each transmission point to have locally optimized CSI-RS configurations independent of PCI. Even when multiple transmission points share the same PCI for simplified UE operation, each point can transmit CSI-RS with locally adapted parameters (power levels, resource allocations, frequency shifts) that are optimized for its specific location and interference environment, enabling both UE simplicity and interference mitigation.
Solution Approach 2:
The patent uses CSI-RS as an intermediary signal that bridges the gap between simplified PCI-based UE operation and the need for transmission point-specific reference signals. The decoupled CSI-RS configuration acts as a mediator that carries transmission point-specific information without requiring UEs to process multiple PCIs, thus maintaining ease of operation while enabling interference mitigation through differentiated reference signal characteristics.
3Reliability
If open loop power control uses traditional reference signals in heterogeneous networks, then backward compatibility is maintained, but performance deteriorates due to mismatched power control between macro and pico base stations causing increased interference
Solution Approach 1:
The patent implements preliminary action by having the network pre-configure CSI-RS parameters and power control settings for each transmission point before UE connection. The gNB configures distinct CSI-RS resources with appropriate power levels and characteristics for macro and pico cells in advance, allowing UEs to perform accurate pathloss measurements and power control calculations from the start, thereby preventing interference issues rather than correcting them later, while maintaining backward compatibility through standardized configuration procedures.
Data Source
AI summary
Certain aspects of the present disclosure relate to techniques for power control and user multiplexing for coordinated multi-point (CoMP) transmission and reception in heterogeneous networks (HetNet).