Base Station Scheduler for Accurate Channel State Estimation
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately estimating channel states for both uplink and downlink channels due to the limited coverage of uplink sounding reference signals, which do not necessarily occupy the same frequency band as the physical uplink control channel, leading to incomplete channel state estimation.
Innovation Solution
A base station scheduler allocates separate radio resources for transmitting control channel signals and reference signals, allowing for the transmission of reference signals even when control channel signals are not present, enabling more accurate channel state estimation by using both first and second reference signals across the same or different radio resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If uplink sounding reference signals are used for channel state estimation, then channel state estimation can be performed, but the frequency band coverage is incomplete and does not match the uplink frequency band
Solution Approach 1:
The patent combines uplink sounding reference signals with first reference signals transmitted on physical uplink control channels to merge their frequency band coverages. This allows channel state estimation across the entire uplink frequency band by integrating measurements from both signal types, resolving the coverage gap issue.
Solution Approach 2:
The patent enables the physical uplink control channel to serve dual purposes: transmitting control information and carrying first reference signals for channel state estimation. This multi-functionality allows the same radio resources to provide both control functionality and measurement coverage across the full frequency band.
2Measurement precision
If separate radio resources are allocated for control channel signals and reference signals, then comprehensive channel state coverage is achieved, but radio resource consumption increases
Solution Approach 1:
The patent merges control channel signals and reference signals into the same radio resources through superposition. The wireless terminal transmits both types of signals simultaneously on allocated physical uplink control channel resources, allowing the base station to extract both control information and reference signals without requiring separate resource allocations.
Solution Approach 2:
The patent makes radio resources universal by enabling them to carry multiple signal types simultaneously. The physical uplink control channel resources are designed to handle both control channel signals and first reference signals, reducing overall resource consumption while maintaining comprehensive channel state coverage.
Data Source
AI summary
A base station includes a scheduler which allocates a first radio resource and a second radio resource while the first radio resource is used to transmit a control channel signal from a wireless terminal, and the second radio resource is used to transmit from the wireless terminal a first reference signal corresponding to the control channel signal even when the wireless terminal does not transmit the control channel signal by using the first radio resource.