Coordinated Multi-Point CSI Reporting via Priority Index
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Solution Overview
Problem
In small cell networks, obtaining full Channel State Information (CSI) for multi-Transmission/Reception Point (TRP) schemes is challenging due to increased complexity and overhead, especially in terms of uplink reporting resources, which affects scheduling decisions and performance.
Innovation Solution
A method is introduced that uses a coordination priority index, calculated based on Bit Rate requirements and Signal to Interference and Noise Ratio (SINR), to streamline CSI reporting, allowing users to select a subset of CSI reports, thereby reducing the number of communication channels and improving resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full Channel State Information (CSI) is obtained for multi-TRP schemes, then scheduling decisions and performance are improved, but uplink reporting resources and complexity increase
Solution Approach 1:
The patent segments the full CSI reporting into two parts: CQI reporting for all TRPs and CSI report for a selected subset of TRPs. This segmentation allows the system to obtain comprehensive channel quality information while reducing the overall reporting overhead and complexity by dividing the reporting requirements into manageable components with different levels of detail.
Solution Approach 2:
The patent extracts only the most critical CSI elements for reporting. Specifically, it extracts CQI values for all TRPs and selects only the top N TRPs with the highest CQI values for detailed CSI reporting. This extraction approach maintains scheduling decision accuracy by focusing on the most relevant TRPs while significantly reducing uplink reporting resources and complexity.
2Quantity of substance
If coordination priority index is calculated and used to select subset of CSI reports, then uplink reporting resources are reduced, but scheduling complexity increases
Solution Approach 1:
The patent applies preliminary action by calculating the coordination priority index (CPI) in advance based on bit rate requirements and SINR measurements. This pre-calculation allows the network to determine which TRPs should be included in the CSI report before the actual reporting occurs, reducing uplink reporting volume while keeping the scheduling algorithm relatively simple through a clear, pre-defined selection criterion.
3Reliability
If coordination priority index is used to preferentially assign resources to users with poor SINR, then fairness is improved, but resource allocation complexity increases
Solution Approach 1:
The patent introduces a new parameter, the coordination priority index (CPI), which combines bit rate requirements and SINR measurements into a single metric. This parameter change transforms the resource allocation process into a more systematic approach where users with poor SINR or high bit rate requirements automatically receive higher priority. The CPI parameter simplifies the fairness mechanism while maintaining reasonable resource allocation complexity through a clear mathematical relationship.
Data Source
AI summary
A priority-resource-limited CoMP scheme is proposed based on a coordination priority index of users which comes into play to perform cooperation set selection and resource allocation in small cell networks. The CoMP control unit (CCU) configures and then transmits to the donor (serving) Transmission/Reception Point (TRP) the coordination priority index which is determined as a function of the required Bit Rate for that specific User Equipment and the SINR or the CQI. The donor Transmission/Reception Point (TRP) then transmits the coordination priority indexes sent by the CCU to the corresponding User Equipment (UE)s. The configuration of the coordination priority index allows the User Equipment to select a subset of Channel State Information reports or Channel State Information quantities to report so that the threshold index of the coordination priority is met.