Subband Precoding Indication for Uplink Scheduling
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Solution Overview
Problem
Current uplink transmission technologies face performance loss due to channel frequency selectivity, as existing methods fail to effectively indicate precoding information for scheduling subbands, especially in multi-user scenarios with dynamic resource allocation.
Innovation Solution
The method involves dividing frequency domain resources into scheduling subbands, establishing a correspondence between precoding indications and subbands based on the total number of subbands and precoding indications, and using fixed or semi-static precoding indications in DCI to ensure consistent precoding information within each subband, reducing multi-user interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If broadband precoding indication is used in DCI for uplink transmission, then device complexity is reduced, but performance loss occurs for users with strong channel frequency selectivity
Solution Approach 1:
The frequency domain resources are divided into multiple scheduling subbands, and separate precoding indications are provided for each subband. This segmentation allows the system to adapt to channel frequency selectivity by providing subband-specific precoding information, thereby resolving the contradiction between using simple broadband precoding and achieving high performance in frequency-selective channels.
2Reliability
If subband-specific precoding information is provided, then uplink transmission performance improves, but device complexity and signaling overhead increase
Solution Approach 1:
The precoding indication for each scheduling subband is merged with the resource allocation information in the DCI. By combining these functions, the system provides subband-specific precoding information without significantly increasing signaling overhead, thus resolving the contradiction between performance improvement and complexity increase.
Solution Approach 2:
The DCI structure is designed to serve multiple functions: resource allocation, scheduling subband indication, and precoding information delivery. This multi-functionality allows the system to provide detailed subband-specific precoding information while using the existing DCI framework, thereby reducing the overall system complexity.
3Productivity
If dynamic resource allocation is used, then resource utilization efficiency improves, but consistency of precoding information across subbands becomes difficult to maintain
Solution Approach 1:
The system provides precoding information that is locally optimized for each scheduling subband rather than using a single global precoding indication. This local quality approach allows dynamic resource allocation while maintaining precoding consistency within each subband, as each subband receives precoding information tailored to its specific channel conditions.
Data Source
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AI summary
Disclosed are a scheduling subband allocation method and apparatus, and a device and a readable storage medium. The method comprises: receiving downlink control information (DCI) sent by a base station, and determining scheduling subbands in a physical uplink shared channel (PUSCH); and establishing a correlation between precoding indications in the DCI and the scheduling subbands in the PUSCH according to at least one parameter of the total number of scheduling subbands in the PUSCH and the total frequency domain distance of the scheduling subbands in the PUSCH and according to the total number of precoding indications in the DCI.