Spatial Resource Selection Under Frequency-Hopping SRS Ambiguity
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Solution Overview
Problem
In wireless communication systems using overlapping frequency ranges for uplink and downlink, channel condition estimation based on reference signals transmitted in different frequency intervals at different time intervals leads to inaccurate spatial resource selection, potentially selecting unsuitable resources or discarding suitable ones.
Innovation Solution
A method for spatial resource selection that determines beam validity by considering the DTX state of current and past SRS hops, using quality criteria and weighting factors to ensure accurate selection, even with frequency hopping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel condition estimation is performed based on reference signals transmitted at different time intervals in different frequency intervals, then frequency hopping can be utilized to improve coverage and reliability, but the channel condition estimation becomes more cumbersome and spatial resource selection accuracy deteriorates
Solution Approach 1:
The patent segments the channel condition estimation process by determining beam validity separately for each frequency interval based on SRS measurements. Instead of performing a single complex estimation across all frequency intervals, the method divides the estimation into multiple independent beam validity determinations, one for each frequency interval where SRS was transmitted. This segmentation reduces the overall complexity while maintaining reliability.
Solution Approach 2:
The patent performs preliminary beam validity determination for each frequency interval before final spatial resource selection. By pre-determining which beams are valid in each frequency interval based on SRS measurements, the system prepares the necessary information in advance, simplifying the subsequent spatial resource selection process and improving accuracy without adding real-time complexity.
2Measurement precision
If beam validity is determined without considering DTX state of multiple SRS hops, then the determination process is simpler, but ambiguity increases and selection accuracy decreases
Solution Approach 1:
The patent implements feedback by considering the DTX (discontinuous transmission) state of multiple SRS hops when determining beam validity. The system uses SRS measurement results from previous frequency intervals as feedback to inform the current beam validity determination. This feedback mechanism reduces ambiguity in beam validity determination by incorporating historical measurement data, improving precision without requiring overly complex real-time analysis.
Data Source
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AI summary
A method is disclosed for spatial resource selection from a plurality of spatial resources. The method comprises - for each spatial resource of the plurality of spatial resources - receiving a plurality of reference signal blocks using the spatial resource (wherein at least some of the reference signal blocks are received in different frequency intervals and during different time intervals), determining (for each received reference signal block) whether or not a signal quality metric of the received reference signal block meets a quality criterion, and determining whether the spatial resource is to be considered for spatial resource selection based on the quality criterion determinations of the received reference signal blocks. The spatial resources may be beams of a beam-forming application, or antennas of a multi-antenna arrangement, or multiple-input multiple-output (MIMO) streams. The reference signal blocks may comprise one or more of uplink reference signals, sounding reference signals, demodulation reference signals, and phase tracking reference signals. Corresponding apparatus, network node and computer program product are also disclosed.