Intra-Frequency Uplink Scheduling Across Multiple Serving Cells
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Solution Overview
Problem
Current communication systems lack a solution for intra-frequency uplink and downlink transmission in terminal devices, particularly when multiple cells on the same frequency band cause interference, leading to poor channel conditions.
Innovation Solution
Implement intra-frequency transmission by determining and managing association relationships between serving cells using indication or configuration information, with power control and scheduling mechanisms to ensure total transmit power does not exceed device limits, and utilizing different CDM groups for orthogonal time-frequency resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If intra-frequency deployment is used to improve spectrum utilization, then spectrum utilization is improved, but interference between cells increases and channel conditions deteriorate
Solution Approach 1:
The patent segments the uplink transmission by assigning different CDM (Code Division Multiplexing) groups to different serving cells. Each CDM group uses orthogonal resources, effectively dividing the frequency band into separate transmission channels that avoid mutual interference while maintaining intra-frequency deployment benefits
Solution Approach 2:
The patent applies local quality by configuring cell-specific uplink transmission parameters including cell-specific CDM group assignments and cell-specific power control settings. This allows each cell to have optimized transmission characteristics tailored to its specific channel conditions and interference environment
2Reliability
If multiple serving cells are configured for uplink transmission, then transmission diversity is improved, but power management complexity increases
Solution Approach 1:
The patent changes the power management approach by introducing cell-specific power control parameters and maximum power settings for each serving cell. The terminal device adjusts transmission power per cell based on configured parameters and real-time conditions, enabling multi-cell transmission diversity while maintaining manageable power control through standardized parameter configurations
3Productivity
If CA technology is used for uplink transmission, then data communication capability is improved, but intra-frequency transmission support is lacking
Solution Approach 1:
The patent extends Carrier Aggregation functionality to support intra-frequency transmission by configuring multiple serving cells on the same frequency band with distinct CDM group assignments. This enables the CA mechanism to function universally across both inter-frequency and intra-frequency scenarios, enhancing adaptability while maintaining data communication capabilities
Data Source
AI summary
Embodiments of this application provide an uplink transmission method and apparatus, a computer-readable storage medium, a computer program product, and the like, to implement intra-frequency uplink transmission by a terminal device. The method includes: determining a plurality of serving cells, where the plurality of serving cells have at least one of the following association relationships: operating frequency bands are completely the same, or the operating frequency bands are partially the same; and sending uplink signals to the plurality of serving cells, where the sending of the uplink signal meets a preset condition.