Precoding Matrix Index Configuration via Dynamic Codebook Selection
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Solution Overview
Problem
Current communication technologies in 3GPP LTE R10 are unable to achieve flexible configuration or utilization of PMI (Precoding Matrix Index) according to transmission channel conditions, limiting efficient data transmission.
Innovation Solution
The method involves selecting precoding matrices of different accuracies based on the transmission channel's capability to carry PMI, allowing for flexible configuration by forming a second codebook set from a first codebook set, and transmitting an index corresponding to the selected precoding matrix to enable precise data precoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PMI information is transmitted using fixed-bit allocation (at most 4 bits), then the transmission protocol is simple, but the system cannot adapt to different channel conditions and loses transmission efficiency
Solution Approach 1:
The patent implements dynamic PMI configuration where the UE selects from multiple codebook sets (first codebook set and second codebook set) based on channel conditions. The codebook set indicator dynamically switches between different codebook configurations, allowing the system to adapt PMI transmission to varying channel capabilities rather than using a fixed bit allocation scheme.
Solution Approach 2:
The patent changes the parameter of codebook configuration by introducing multiple codebook sets with different properties. The first codebook set is used when channel conditions favor certain characteristics, while the second codebook set is used under different conditions. This parameter change approach enables flexible adaptation without increasing fundamental system complexity.
2Productivity
If a single codebook set is used for PMI selection, then the system is simple to implement, but it cannot optimize data transmission for varying channel conditions
Solution Approach 1:
The patent employs dynamic codebook set selection where the UE determines which codebook set to use based on measured channel conditions. The codebook set indicator signals the selected codebook set to the network side, enabling the system to optimize data transmission efficiency for varying channel conditions while maintaining manageable complexity through standardized selection criteria.
Solution Approach 2:
The patent creates a universal framework that supports multiple codebook sets within a single system. The same UE and network equipment can handle both first and second codebook sets using unified procedures for selection, indication, and processing. This multi-functionality approach allows the system to optimize for different channel conditions without requiring separate systems for each codebook set.
3Adaptability or versatility
If PMI bit allocation is fixed at 4 bits maximum, then the uplink control channel design is simple, but the system loses the ability to utilize channels with higher PMI carrying capability
Solution Approach 1:
The patent implements dynamic adaptation of PMI precision by selecting from different codebook sets based on channel capability. When the channel can support higher precision, the system uses the second codebook set which provides more accurate PMI representation. When channel conditions are less favorable, it falls back to the first codebook set, thus dynamically matching PMI precision to channel capability without fixed bit allocation.
Solution Approach 2:
The patent changes the precision parameter of PMI representation by using different codebook sets. The first codebook set provides a certain level of precision suitable for basic conditions, while the second codebook set provides higher precision for channels capable of supporting it. This parameter change enables the system to utilize channels with higher PMI carrying capability when available, preventing loss of information precision.
Data Source
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AI summary
A method and an apparatus for sending a Precoding Matrix Index, PMI, and performing precoding are provided in the embodiments of the present invention. The method for sending the PMI comprises the following steps: a user equipment acquires the capability of a physical uplink control channel, PUCCH, to carry said PMI; according to the PUCCH capability of carrying the PMI, the precoding matrices are selected from a locally-stored first codebook set to form a second codebook set; a first precoding matrix is selected from the second codebook set; an index corresponding to the first precoding matrix is sent to a base station over the transmission channel. The base station then determines the first precoding matrix according to the index and precodes the data according to the first precoding matrix. With the embodiments of the present invention provide a flexible configuration and use of the PMI.