SRS Optimization for Coordinated Multi-Point Transmission
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Solution Overview
Problem
Existing CoMP systems face challenges in efficiently managing interference and resource allocation in heterogeneous wireless communication networks, particularly in coordinating multipoint transmission and reception, which affects the performance of sounding reference signals (SRS) due to lack of consideration for joint reception by multiple cells.
Innovation Solution
The proposed solution involves configuring user equipment (UE) to transmit two different sets of SRS signals, one for a serving cell and another for joint reception by multiple cells, with separate power control schemes to optimize SRS transmission and reception, enabling effective interference management and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single SRS transmission scheme is used for all base stations, then the system complexity is low, but the interference coordination performance deteriorates
Solution Approach 1:
The patent segments the SRS transmission scheme into two distinct types: Type 1 SRS for serving cell and Type 2 SRS for CoMP reception. Each type has separate power control parameters (P0, alpha, delta) and resource allocation rules. This segmentation allows independent optimization of each SRS type for its specific purpose, improving interference coordination while maintaining manageable complexity through structured differentiation.
Solution Approach 2:
The patent applies local quality by configuring different power control parameters and transmission characteristics for different SRS types based on their specific requirements. Type 1 SRS uses parameters optimized for serving cell communication, while Type 2 SRS uses parameters optimized for CoMP joint reception. This localized optimization ensures each SRS transmission has the appropriate quality characteristics for its intended function.
2Measurement precision
If separate power control schemes are used for different SRS types, then the SRS reception performance improves, but the power control mechanism complexity increases
Solution Approach 1:
The power control mechanism is segmented into separate control loops for Type 1 and Type 2 SRS. Each loop has its own power control parameters (P0_NOMINAL_PUSCH, alpha, delta_TPC) that are independently configured and adjusted. This segmentation enables precise control of each SRS type's transmission power based on specific reception requirements, improving measurement precision while organizing complexity into manageable separate control structures.
Solution Approach 2:
The patent utilizes parameter changes by allowing different power control parameters (P0, alpha, delta) to be configured for different SRS types. These parameters can be dynamically adjusted through RRC signaling and TPC commands to optimize reception performance under varying channel conditions. This parameter flexibility enables adaptive optimization of SRS reception while maintaining a standardized power control framework.
3Adaptability or versatility
If multiple SRS types are transmitted with different cell identifiers, then the CoMP reception capability improves, but the resource allocation complexity increases
Solution Approach 1:
The resource allocation is segmented into separate resource pools for Type 1 and Type 2 SRS transmissions. Each type can be allocated specific time-frequency resources, cyclic shifts, and comb patterns independently. This segmentation enables simultaneous transmission of multiple SRS types with different cell identifiers without resource conflicts, improving CoMP reception capability while organizing resource management into structured separate allocations.
Solution Approach 2:
The patent implements universality by designing a unified SRS resource configuration framework that handles both Type 1 and Type 2 SRS through common procedures. The same RRC signaling mechanisms, power control algorithms, and physical layer processing are used for both types, with differences managed through configuration parameters. This multi-functional approach enables support for multiple SRS types and cell identifiers while avoiding the need for entirely separate resource allocation mechanisms.
Data Source
AI summary
Certain aspects of the present disclosure relate to techniques for power control and SRS multiplexing for coordinated multi-point (CoMP) transmission and reception in heterogeneous networks (HetNet). Multiple SRS processes are supported with different physical and/or virtual cell ID. Different power control offsets and processes are associated with the different SRS processes.