Base Station Common Downlink Reference Signal Allocation
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Solution Overview
Problem
In high-frequency band radio communication, the performance is affected by the movement of terminals due to rapid changes in channel state information caused by the Doppler effect, leading to degraded transmission performance and increased radio overhead when trying to adapt to these changes.
Innovation Solution
A base station is configured to estimate the Doppler shift using an uplink reference signal and assign a common downlink reference signal to multiple beams, allowing for improved communication performance by reducing the frequency of reference signal transmissions and enhancing beam switching efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a common downlink reference signal is assigned to multiple beams, then radio overhead is reduced and data throughput is improved, but the ability to track rapid channel state changes due to terminal movement deteriorates
Solution Approach 1:
The patent merges multiple individual beam reference signals into a single common downlink reference signal that is shared across multiple beams. This consolidation reduces the total quantity of reference signals transmitted, thereby reducing radio overhead while maintaining sufficient channel state information for terminals moving at typical speeds.
Solution Approach 2:
The patent introduces dynamic adaptation by allowing the system to switch between using a common downlink reference signal for normal operation and individual beam reference signals when rapid channel changes are detected. This dynamic approach optimizes the balance between radio overhead reduction and channel state tracking accuracy based on actual terminal movement conditions.
2Measurement precision
If reference signal transmission frequency is increased to track channel changes, then channel state information accuracy is improved, but radio overhead increases and data throughput decreases
Solution Approach 1:
The patent implements periodic transmission of the common downlink reference signal at optimized intervals rather than continuous or high-frequency transmission. This periodic approach maintains sufficient channel state information accuracy for the intended application while significantly reducing the total quantity of reference signals transmitted compared to traditional approaches.
Solution Approach 2:
The patent changes the parameter of reference signal transmission frequency from high/continuous to optimized periodic intervals. This parameter adjustment reduces radio overhead while maintaining adequate channel state information accuracy for terminals moving at typical speeds, resolving the contradiction between measurement precision and quantity of substance.
3Reliability
If individual beam reference signals are used for each beam, then beam-specific channel tracking is improved, but device complexity and signal management overhead increase
Solution Approach 1:
The patent merges the function of multiple individual beam reference signals into a single common downlink reference signal. This consolidation simplifies signal management and reduces device complexity while providing sufficient beam-specific channel tracking capability through the shared reference signal, eliminating the need for complex individual signal management.
Solution Approach 2:
The common downlink reference signal serves multiple functions simultaneously: it provides channel state information for multiple beams, enables terminal velocity estimation, and supports beam management. This multi-functionality reduces the need for separate dedicated reference signals for each function, thereby reducing device complexity and signal management overhead.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances radio communication performance by reducing radio overhead and improving data throughput while adapting to terminal movement, even at high speeds, by treating multiple beams as a single 'thick' beam to extend coverage and reduce switching frequency.
Implementation Method 1
there is scope for further study on improvement in performance of radio communication dependent on movement of a terminal... based on a Doppler shift estimated using an uplink reference signal
Data Source
AI summary
This base station comprises: a control unit that allocates, on the basis of a doppler shift estimated using an uplink reference signal, a downlink reference signal common to a plurality of beams; and a transmission unit that transmits the common downlink reference signal via the plurality of beams. According to this base station communication method, the base station allocates, on the basis of a doppler shift estimated using an uplink reference signal, a downlink reference signal common to a plurality of beams, and transmits the common downlink reference signal via the plurality of beams.