Mobile Station Sounding Reference Signal Cyclic Shift Orthogonality
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Solution Overview
Problem
Conventional mobile communication systems face inefficiencies in scheduling due to insufficient orthogonality of resources for reference signals across antennas, requiring complex parameter settings by base station apparatuses.
Innovation Solution
A mobile station apparatus transmits sounding reference signals using multiple antenna ports with cyclic shifts determined by a single value set by the base station, employing specific parameter settings for cyclic shifts and frequency offsets to improve orthogonality, allowing efficient scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional parameter settings are used for reference signals across antennas, then the system can operate with standard configurations, but orthogonality of reference signal resources is insufficient leading to scheduling inefficiencies
Solution Approach 1:
The patent applies parameter changes by introducing specific formulas for cyclic shift and frequency offset that transform the reference signal parameters based on antenna port index and cell ID. The cyclic shift is calculated as α(p) = 2πn_cs,p/N where n_cs,p = (n_cs + 2p) mod N, and frequency offset as k_p = k_TC + p. These parameter transformations ensure orthogonal resource allocation across multiple antennas while maintaining systematic configuration.
Solution Approach 2:
The patent segments the reference signal resources across multiple antenna ports by assigning distinct cyclic shifts and frequency offsets to each antenna port. This segmentation divides the overall resource space into orthogonal segments for each antenna, allowing simultaneous transmission without interference and improving scheduling efficiency.
2Reliability
If orthogonality of reference signal resources is enhanced across antennas, then scheduling efficiency improves, but complex parameter settings are required by base station apparatuses
Solution Approach 1:
The patent resolves this contradiction by establishing systematic parameter change rules that automatically generate orthogonal configurations. The cyclic shift parameter n_cs,p = (n_cs + 2p) mod N and frequency offset k_p = k_TC + p provide deterministic orthogonal separation without requiring manual complex configuration. The base station only needs to set the base parameters n_cs and k_TC, while the orthogonality across antennas is automatically achieved through the formulated parameter transformations.
Solution Approach 2:
The system implements self-service by allowing the orthogonality to be automatically achieved through the defined parameter relationships. Once the base parameters are set, the cyclic shifts and frequency offsets for each antenna port are self-determined by the formulas, eliminating the need for manual complex configuration and reducing base station setting complexity while ensuring orthogonality.
3Measurement precision
If multiple antenna ports are used for transmitting sounding reference signals, then channel measurement accuracy improves, but resource orthogonality becomes insufficient without proper parameter differentiation
Solution Approach 1:
The patent applies parameter changes to differentiate reference signals across multiple antenna ports. By calculating distinct cyclic shifts α(p) and frequency offsets k_p for each antenna port p, the system maintains resource orthogonality while enabling simultaneous transmission from multiple antennas. This parameter differentiation ensures that channel measurements from each antenna remain independent and accurate.
Solution Approach 2:
The patent segments the frequency-time resource space for each antenna port using unique cyclic shifts and frequency offsets. This segmentation creates orthogonal resource regions for each antenna, allowing the system to maintain both measurement precision through multiple antennas and resource orthogonality through proper parameter allocation.
Data Source
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AI summary
To provide a mobile station apparatus, a base station apparatus, a method and an integrated circuit which are capable of dissolving complexity of setting by the base station apparatus and performing efficient scheduling by improving the orthogonality of resources of a reference signal for every antenna. A mobile station apparatus which transmits a sounding reference signal to a base station apparatus using a plurality of antenna ports, wherein based on one value set specifically to a mobile station apparatus by a parameter notified of by a higher layer from the base station apparatus, a cyclic shift applied to a sounding reference signal corresponding to the plurality of antenna ports is determined.