Virtual Frame Timing for CoMP Signal Demodulation
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Solution Overview
Problem
In CoMP environments, smooth coordinated transmission is challenging when frame timings of transmission points differ, leading to difficulties in correctly demodulating signals and decoding data due to mismatched subframe/slot indices.
Innovation Solution
Configuring a virtual frame timing and virtual cell identifier independently for each channel, allowing the user equipment to align with the reference frame timing of each transmission point, enabling seamless cooperative transmission and reception across channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frame timings of transmission points are different in CoMP environment, then cooperative transmission can be performed with flexible timing configuration, but signal demodulation and data decoding become difficult due to mismatched subframe/slot indices
Solution Approach 1:
The patent segments the timing configuration by introducing channel-specific virtual frame timings. Different channels (e.g., PDSCH, PUSCH, control channels) are assigned different virtual frame timings independently, allowing each channel to be optimized separately while maintaining overall system coherence. This segmentation resolves the contradiction by enabling flexible timing per channel without causing demodulation issues.
Solution Approach 2:
The patent introduces virtual frame timings as an intermediary layer between the actual transmission point timings and the UE processing. These virtual timings act as a mediator that aligns the UE's reference timings with the actual transmission timings of different channels, enabling correct demodulation even when transmission points have different frame timings.
2Reliability
If virtual frame timing is configured independently for each channel, then correct signal decoding is enabled across different transmission points, but system complexity increases
Solution Approach 1:
The patent implements dynamic timing configuration where virtual frame timings can be adjusted independently for different channels based on transmission requirements. The system can dynamically select appropriate virtual timings for PDSCH, PUSCH, and control channels, allowing flexibility in managing complexity while maintaining decoding accuracy.
Solution Approach 2:
The patent changes the timing parameters (virtual frame timings) for different channels independently. By modifying these parameters according to channel-specific requirements, the system achieves correct signal decoding without requiring a complete redesign of the timing structure, thus managing complexity effectively.
3Device complexity
If reference frame timing is used for all channels, then system operation is simplified, but coordinated transmission fails when transmission points have different frame timings
Solution Approach 1:
Instead of using a single reference frame timing for all channels, the patent segments the timing configuration into channel-specific virtual frame timings. This segmentation enables each channel to be independently optimized for cooperative transmission while maintaining overall system coordination.
Solution Approach 2:
The patent creates a universal timing configuration mechanism that can accommodate multiple transmission points with different frame timings. The virtual frame timing system serves multiple functions: it maintains simplicity for channels that don't require CoMP while enabling sophisticated timing coordination for channels that do, thus achieving multi-functionality.
Data Source
AI summary
A method for transmitting, at a user equipment, an uplink signal to a transmission point performing cooperative transmission in a wireless communication system according to an embodiment of the present invention includes generating the uplink signal based on a virtual cell identifier and virtual timing information, wherein the virtual cell identifier and virtual timing information are independently configured according to transmission channels.