5G UE Time Domain Window Adjustment for DMRS Phase Continuity
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Solution Overview
Problem
In 5G networks, the legacy DMRS framework limits channel estimation to a single slot, while DMRS bundling across multiple slots improves performance, but requires static channels and consistent power and phase across slots, which can be disrupted by events like timing advance updates, leading to phase discontinuity and inefficient communication.
Innovation Solution
A method for reporting time and frequency compensation updates to a base station, allowing the user equipment (UE) to adjust the time domain window based on physical characteristics and transmit a compensation report, ensuring phase and power continuity, thereby maintaining accurate channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DMRS bundling is applied across multiple slots, then channel estimation performance is improved, but phase continuity is disrupted by timing advance updates
Solution Approach 1:
The UE determines the actual time domain window and identifies timing advance update events before they occur. By proactively adjusting the time domain window boundaries based on predicted timing advance updates, the system prevents phase discontinuity from disrupting the DMRS bundling, thereby maintaining both channel estimation accuracy and phase continuity across multiple slots.
Solution Approach 2:
The time domain window is made dynamic rather than static. The UE continuously monitors for timing advance update events and adjusts the actual time domain window boundaries in real-time. This dynamic adaptation allows the DMRS bundling to maintain phase continuity even when timing advance updates occur, resolving the contradiction between improving channel estimation through multi-slot bundling and maintaining phase stability.
2Duration of action of stationary object
If the time domain window is extended to multiple slots for DMRS bundling, then coverage is improved, but events like timing advance updates cause phase discontinuity
Solution Approach 1:
The system proactively identifies timing advance update events and adjusts the time domain window boundaries before the actual update occurs. This preliminary adjustment ensures that the extended time domain window spanning multiple slots does not include phase discontinuities, thereby maintaining both the extended duration for improved coverage and the reliability of phase consistency.
Solution Approach 2:
The time domain window is segmented into multiple actual time domain windows, each bounded by timing advance update events. This segmentation allows the system to maintain phase consistency within each segment while still achieving extended coverage through the overall multi-slot DMRS bundling framework. The segmentation approach resolves the contradiction by creating manageable segments that preserve phase reliability.
3Measurement precision
If timing advance updates are performed to maintain synchronization, then uplink alignment is improved, but phase and power consistency across slots is disrupted
Solution Approach 1:
The timing advance update events are extracted and identified as specific boundary points within the time domain window. By taking out these events and using them to define the boundaries of actual time domain windows, the system allows timing advance updates to occur without disrupting the phase and power consistency within each segmented window. This extraction approach enables both precise uplink timing alignment and stable phase/power consistency.
Solution Approach 2:
The actual time domain window boundaries act as an intermediary mechanism between timing advance updates and DMRS bundling. By introducing these dynamically adjusted boundaries, the system mediates the conflict between timing advance updates (which improve alignment) and phase/power consistency (which are disrupted by updates). The intermediary boundaries ensure that DMRS bundling operations occur within stable phases while still allowing necessary timing adjustments.
Data Source
AI summary
A method, apparatus, and computer program product are disclosed for reporting time and frequency compensation updates to a base station in a 5G network. In this regard, an example method is configured to determine an actual time domain window based at least in part on a time domain window received at the user equipment from a base station, and on at least one adjustment to at least one of time or frequency of a reference signal due to a physical characteristic of a transmission environment. The example method may further cause a compensation report to be transmitted to the base station in a control channel message within the uplink communication stream. The compensation report includes an indication of the at least one adjustment. The method further causes the reference signal to be transmitted in the actual time domain window to the base station.