Codebook Subset Determination for Uplink Transmission
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Solution Overview
Problem
Current methods for determining codebook subsets in codebook-based PUSCH transmission assume equal numbers of antenna ports across all SRS resources, leading to incorrect configurations when different numbers of antenna ports are used, affecting full power transmission and the sizing of TMPI and rank fields in DCI format 0_1.
Innovation Solution
A method and device for determining codebook subsets in user equipment (UE) that receive indication and configuration information to configure codebook subsets based on the number of antenna ports in each SRS resource, allowing for correct codebook subset determination for uplink transmission, even when different numbers of antenna ports are configured, by using specific higher-layer parameters and bit-field mappings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the current method of determining codebook is used based on the assumption that the numbers of antenna ports of all SRS resources are same, then the method is simple to implement, but the codebook subset configuration becomes wrong when different numbers of antenna ports are configured
Solution Approach 1:
The patent applies local quality by configuring different codebook subsets for different SRS resources based on their specific number of antenna ports. Each SRS resource can have its own codebook subset configuration (e.g., codebookSubset1 for 2 antenna ports, codebookSubset2 for 4 antenna ports), allowing the system to optimize for each local condition rather than using a uniform configuration across all resources.
Solution Approach 2:
The patent changes the parameter of codebook subset configuration based on the number of antenna ports. When the number of antenna ports changes (from 2 to 4 or vice versa), the system switches between different codebook subsets. This parameter change approach allows the codebook configuration to adapt to different antenna port configurations, resolving the contradiction between simple implementation and accurate configuration.
2Adaptability or versatility
If different numbers of antenna ports are configured in different SRS resources to support full power transmission, then full power transmission is supported, but the current determination method produces wrong codebook subset configurations
Solution Approach 1:
The patent introduces dynamics by making the codebook subset configuration adaptable to different SRS resources. The network device can dynamically indicate which SRS resource to use, and the UE determines the appropriate codebook subset based on the indicated resource's antenna port configuration. This dynamic adaptation enables full power transmission support while maintaining configuration accuracy.
Solution Approach 2:
The patent segments the codebook configuration into multiple codebook subsets, each corresponding to a specific number of antenna ports. Instead of using a single unified codebook configuration, the system divides the codebook space into separate subsets (codebookSubset1, codebookSubset2, etc.), allowing each subset to be optimized for its specific antenna port configuration while supporting diverse transmission requirements.
3Device complexity
If the assumption of equal antenna ports is used for determining TPMI and rank field size in DCI format 0_1, then the field sizing method is straightforward, but the sizing becomes incorrect when different numbers of antenna ports are used
Solution Approach 1:
The patent changes the TPMI and rank field size parameters based on the indicated SRS resource's antenna port configuration. When a 2-antenna-port SRS resource is indicated, one field size is used; when a 4-antenna-port SRS resource is indicated, a different field size is used. This parameter change approach ensures accurate field sizing while adapting to different antenna configurations.
Data Source
AI summary
Provided is a method and device for determining a codebook subset and a user equipment. In the method, a UE receives first indication information from a network device, the first indication information is used to indicate a first sounding reference signal (SRS) resource in an SRS resource set; the UE receives first configuration information from the network device, the first configuration information is used to configure codebook subsets; and the UE determines a codebook subset for uplink transmission based on the first indication information and the first configuration information.