CoMP TRP Group Selection for Lower CJT Feedback Overhead
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Solution Overview
Problem
Existing CoMP transmission technologies lack clear methods for network devices to configure transmission reception points (TRPs) and for terminals to report selected TRPs during coherent joint transmission (CJT), leading to inefficiencies in synchronization and backhaul link requirements.
Innovation Solution
A method where a network device configures CoMP transmission configuration information for multiple TRPs or TRP groups, and a terminal selects and reports TRPs or TRP groups to perform CJT based on this information, using CSI-RS resources and indication information to enhance synchronization and reduce feedback overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the network device configures multiple TRPs or TRP groups for coherent joint transmission, then the beamforming and precoding gains are enhanced, but the feedback overhead from the terminal increases
Solution Approach 1:
The patent segments the TRPs into multiple TRP groups, where each group can be independently selected and reported by the terminal. This segmentation allows the system to manage feedback overhead by grouping similar TRPs together, reducing the granularity of feedback requirements while maintaining the ability to select optimal TRP combinations for beamforming gains.
Solution Approach 2:
The terminal is designed to select and report only a subset of TRP groups (partial action) rather than all configured TRPs. This partial reporting approach reduces feedback overhead while still enabling the network device to configure multiple TRPs for joint transmission, achieving beamforming gains without requiring complete feedback on all possible TRP combinations.
2Productivity
If the terminal reports detailed information about selected TRPs, then the network device can optimize CoMP transmission, but the complexity of the reporting mechanism increases
Solution Approach 1:
The patent introduces TRP groups as an intermediary layer between individual TRPs and the terminal's reporting mechanism. Instead of the terminal directly reporting on individual TRPs, it reports on groups of TRPs, which simplifies the reporting structure while still providing the network device with sufficient information to optimize CoMP transmission across multiple TRPs.
Solution Approach 2:
The TRP group configuration serves multiple functions: it acts as a feedback reduction mechanism, an organization structure for TRPs, and a selection unit for the terminal. This multi-functionality allows the system to achieve CoMP transmission optimization without requiring complex individual TRP reporting mechanisms.
3Reliability
If coherent joint transmission is implemented across multiple TRPs, then edge coverage and service quality are improved, but synchronization requirements and backhaul link demands increase
Solution Approach 1:
By segmenting TRPs into groups, the patent enables the network device to manage synchronization requirements at the group level rather than requiring perfect synchronization across all individual TRPs. This segmentation allows for more flexible synchronization strategies that can accommodate varying backhaul link qualities while still providing improved edge coverage through coordinated transmission.
Data Source
AI summary
A method for coordinated multiple point (CoMP) transmission performed by a terminal includes: obtaining CoMP transmission configuration information configured by a network device, wherein the CoMP configuration information configures multiple transmission reception points (mTRP) or a plurality of TRP groups, each TRP group in the plurality of TRP groups comprises at least one TRP, and the mTRP or the plurality of TRP groups perform coherent joint transmission (CJT); selecting all or part of TRPs to perform the CJT from the mTRP, or selecting all or part of TRP groups to perform the CJT from the plurality of TRP groups, based on the CoMP transmission configuration information; and sending indication information to the network device, wherein the indication information indicates the TRPs selected by the terminal to perform the CJT from the mTRP, or the TRP groups selected by the terminal to perform the CJT from the plurality of TRP groups.