SRS Bandwidth Alignment with RBG Boundaries in LTE-A Uplink
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Solution Overview
Problem
The combination of conventional frequency resource assignment methods for non-contiguous frequency transmission and SRS transmission in LTE-A systems can lead to mismatched borders between SRS transmission bands and RBGs, resulting in deteriorated CQI estimation accuracy and reduced system throughput.
Innovation Solution
A radio base station and terminal apparatus configuration that aligns the frequency position of the reception or transmission band with the frequency position of the frequency assignment unit and sets the band width as a natural number multiple of the frequency assignment unit, ensuring accurate channel estimation by eliminating dead spaces within RBGs during SRS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-contiguous frequency transmission is used with conventional frequency resource assignment methods, then flexibility in assigning data signal and reference signal to frequency bands increases, but mismatched borders between SRS transmission bands and RBGs occur resulting in deteriorated CQI estimation accuracy
Solution Approach 1:
The patent changes the parameter of SRS transmission bandwidth to be an integer multiple of the RBG size. This ensures that the SRS transmission band borders align with RBG borders, eliminating dead spaces within RBGs and preventing deterioration of CQI estimation accuracy while maintaining the flexibility of non-contiguous frequency transmission
Solution Approach 2:
The patent skips the problematic configuration where SRS transmission band does not align with RBG boundaries by enforcing that SRS transmission bandwidth must be an integer multiple of RBG size. This avoids the creation of dead spaces within RBGs that would otherwise occur with arbitrary SRS bandwidth configurations
2Quantity of substance
If SRS transmission bandwidth is not aligned with RBG boundaries, then more frequency resources can be utilized, but dead spaces within RBGs are created resulting in deteriorated channel quality estimation
Solution Approach 1:
The patent establishes that SRS transmission bandwidth shall be an integer multiple of RBG size, which eliminates dead spaces within RBGs and ensures accurate CQI estimation while still allowing flexible utilization of frequency resources through non-contiguous allocation
Data Source
AI summary
A wireless base station apparatus and wireless terminal apparatus with a configuration which can prevent reductions in the accuracy of channel estimation when non-contiguous band transmission and SRS transmission are employed in an uplink line. In the base station apparatus (100), an allocation setting unit (106), which sets the reception band of an SRS at an SRS extraction unit (103) and sets the units of frequency allocation (RBG) at a CQI estimation unit (104) and allocation unit (105), matches the frequency position at the end of the SRS reception band to the frequency position at the end of any of the units of frequency allocation and sets the reception bandwidth of the reference signal to a natural number multiple of the bandwidth of the unit of frequency allocation. In the terminal apparatus (200), a band information setting unit (204), which sets the transmission band and units of frequency allocation (RBG), matches the frequency position at the end of the transmission band to the frequency position at the end of any of the units of frequency allocation and sets the transmission bandwidth of the SRS to a natural number multiple of the bandwidth of the unit of frequency allocation.