Uplink PMI Notification via Antenna Port Count
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Solution Overview
Problem
Current methods for notifying precoding matrix indicators (PMIs) in wireless communications systems are inefficient, leading to high complexity in blind detection and significant occupation of air interface resources, especially when the size of scheduling resources is indeterminate.
Innovation Solution
A method where a base station determines the quantity of antenna ports used by user equipment (UE) to send an uplink reference signal, calculates frequency domain resource information, and uses this information to determine PMIs for each sub-band, then sends these PMIs to the UE, optimizing the codebook information and bit allocation based on the quantity of antenna ports to reduce the number of indication bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PMIs of multiple sub-bands are sent directly through single signaling (downlink DCI signaling), then the PMI notification is completed, but the complexity of blind detection increases significantly and air interface resources are heavily occupied
Solution Approach 1:
The patent segments the PMI notification process by separating wideband PMI and subband PMI transmissions. The wideband PMI is transmitted first to provide baseline precoding information, while subband PMI transmissions are optimized separately. This segmentation allows the UE to perform blind detection only on the wideband component, significantly reducing detection complexity while maintaining complete PMI notification capability.
Solution Approach 2:
The patent implements dynamic adjustment of codebook size and bit allocation based on the quantity of antenna ports. When the number of antenna ports changes, the system dynamically modifies the codebook configuration and bit width for PMI indication. This dynamic adaptation optimizes the balance between notification completeness and resource efficiency, reducing blind detection complexity while ensuring accurate PMI delivery for different antenna configurations.
2Ease of manufacture
If the codebook size and bit allocation are fixed, then the system configuration is simple, but the air interface resources are inefficiently occupied when scheduling resource sizes are indeterminate
Solution Approach 1:
The patent changes key parameters (codebook size and bit allocation) based on the quantity of antenna ports. The system maintains a mapping relationship between antenna port quantities and corresponding codebook configurations. When antenna port quantity changes, the parameters are adjusted accordingly, optimizing air interface resource usage for different scheduling scenarios while keeping the configuration mechanism relatively simple through predefined mappings.
Solution Approach 2:
The patent creates a universal codebook configuration system that adapts to different antenna port quantities through a unified mapping mechanism. The same base method works for various antenna configurations (2, 4, 8 ports, etc.) by simply changing the codebook size and bit allocation according to the antenna port quantity. This multi-functional approach handles diverse scenarios with a single flexible framework, improving resource efficiency without sacrificing configuration simplicity.
Data Source
AI summary
The present disclosure relates to signaling transmission methods. In one example method, a base station receives an uplink reference signal sent by user equipment (UE). The base station determines a quantity of antenna ports, where the quantity of antenna ports is a quantity of antenna ports used by the UE to send the uplink reference signal. The base station determines frequency domain resource information based on the quantity of antenna ports, where the frequency domain resource information indicates at least one of a quantity of sub-bands or a sub-band bandwidth. The base station determines a precoding matrix indicator (PMI) of each sub-band based on the frequency domain resource information. The base station sends the PMI of the sub-band to the UE.