Coherent Uplink Reference Signals Across Multiple Serving Cells
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Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring coherence for wideband reference signals, particularly in 5G and beyond, due to variations in phase and power across different frequency bands and cells, which affect the accuracy of signal transmission and reception.
Innovation Solution
A method and apparatus for coherent transmission and reception of reference signals involve configuring and transmitting uplink reference signals in multiple serving cells with identical energy per resource element, power control, and beam determination, ensuring the signals are transmitted with the same power and phase alignment, even when overlapping with other signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wideband reference signals are transmitted across multiple serving cells, then the coverage and capacity of the communication system are improved, but phase and power variations across different frequency bands and cells cause coherence degradation
Solution Approach 1:
The patent applies parameter changes by adjusting power control parameters (P0, alpha, pathloss reference signals) and phase alignment parameters (comb offsets, frequency shifts) for reference signals transmitted across multiple serving cells. These parameter adjustments ensure that reference signals maintain consistent power levels and phase relationships despite being transmitted over different frequency bands and through different cellular paths, thereby resolving the coherence degradation issue while maintaining expanded coverage
Solution Approach 2:
The patent implements equipotentiality by equalizing the power levels of reference signals across all serving cells through power control mechanisms. By ensuring that reference signals have identical power spectral density and energy per resource element regardless of which serving cell transmits them, the system eliminates power variations that would otherwise cause coherence issues, allowing reliable wideband reference signal transmission across multiple cells
2Measurement precision
If reference signals are transmitted with high power to improve reception quality, then signal-to-noise ratio is improved, but power variations across cells cause phase inconsistency
Solution Approach 1:
The patent uses parameter changes to simultaneously achieve high reception quality and phase consistency by dynamically adjusting power control parameters based on pathloss measurements and cell-specific configurations. The system modifies transmission power parameters while maintaining phase relationships through coordinated parameter setting across cells, ensuring that high power transmission does not compromise phase consistency
Solution Approach 2:
The patent implements feedback mechanisms where the base station measures the quality of received reference signals from multiple serving cells and adjusts power control parameters accordingly. This closed-loop feedback ensures that power levels are optimized for reception quality while maintaining phase consistency across cells, as the system continuously monitors and adjusts parameters based on actual transmission conditions
3Reliability
If power control parameters are independently configured for each serving cell, then cell-specific optimization is achieved, but system complexity increases
Solution Approach 1:
The patent applies universality by using a common pathloss reference signal configuration across multiple serving cells. Instead of independently configuring all power control parameters for each cell, the system uses a universal pathloss reference that can be applied across cells, reducing configuration complexity while still allowing cell-specific optimizations through parameters like P0 and alpha that can be adjusted per cell based on common measurements
Data Source
AI summary
A method of a terminal may comprise: receiving, from a base station, configuration information of uplink reference signal (UL RS) for two or more serving cells; transmitting a first UL RS to the base station based on the configuration information in a first cell of the two or more serving cells; and transmitting a second UL RS to the base station based on the configuration information in a second cell of the two or more serving cells.