Dynamic A-SRS Switching for Channel Estimation
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Solution Overview
Problem
Conventional wireless communication systems face challenges in performing effective communication between base station and mobile station apparatuses due to inadequate channel estimation, especially in varying communication quality environments, as the mobile station apparatus transmits A-SRS without switching transmission parameters.
Innovation Solution
The system allows the base station apparatus to notify the mobile station apparatus to transmit either a first sounding reference signal within a physical uplink shared channel resource or a second sounding reference signal in a different resource, based on control information in the uplink grant, enabling dynamic switching between inband and outband A-SRS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the mobile station apparatus transmits A-SRS without switching transmission parameters, then the device complexity is reduced, but the channel estimation accuracy deteriorates in varying communication quality environments
Solution Approach 1:
The patent implements dynamic switching between inband A-SRS and outband A-SRS transmission methods based on communication quality conditions. The base station controls the mobile station to select different transmission parameters adaptively, making the system dynamic rather than static. This resolves the contradiction by allowing the system to adjust transmission parameters dynamically to maintain channel estimation accuracy without permanently increasing device complexity.
Solution Approach 2:
The patent changes transmission parameters (frequency position, bandwidth, resource allocation) of A-SRS based on communication quality. By modifying these parameters dynamically, the system achieves accurate channel estimation in varying environments. The base station sends control signals to adjust transmission parameters, enabling the mobile station to optimize A-SRS transmission for different channel conditions without requiring complex autonomous decision-making capability.
2Adaptability or versatility
If the mobile station apparatus uses fixed A-SRS transmission parameters, then the ease of operation is improved, but the adaptability to different communication environments deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the base station monitors communication quality and sends control signals to the mobile station to adjust A-SRS transmission parameters. This feedback loop enables the system to adapt to different communication environments automatically. The mobile station simply follows base station instructions, maintaining operational simplicity while achieving high adaptability through centralized control.
Solution Approach 2:
The patent makes the A-SRS transmission system multi-functional by enabling it to operate in both inband and outband modes. The same transmission mechanism can adapt to different communication quality conditions, serving multiple functions (accurate channel estimation in good conditions, robust channel estimation in poor conditions) without requiring separate systems. This universality achieves adaptability while avoiding the complexity of multiple independent transmission systems.
3Reliability
If the base station performs effective channel estimation, then the communication quality is improved, but the device complexity increases due to dynamic A-SRS transmission control
Solution Approach 1:
The patent combines the control of inband A-SRS and outband A-SRS into a unified transmission framework. The base station uses a single control mechanism to manage both transmission modes, selecting the appropriate mode based on communication quality. This merging approach achieves reliable communication through effective channel estimation while avoiding the complexity of managing separate control systems for different A-SRS types.
Solution Approach 2:
The base station acts as an intermediary that simplifies the overall system operation. By centralizing the decision-making process for A-SRS transmission parameter selection at the base station, the patent reduces the operational complexity at the mobile station. The base station processes control signals and makes adaptation decisions, enabling reliable communication while distributing complexity to the more capable base station rather than increasing mobile station complexity.
Data Source
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Figure 3(a)~3(b)
AI summary
It is possible to perform effective communication based on an A-SRS transmitted from a mobile station apparatus. A base station apparatus: notifies the mobile station apparatus of control information for setting, to the mobile station apparatus, whether to transmit a first sounding reference signal assigned in a physical uplink shared channel resource or to transmit a second sounding reference signal assigned in a resource different from the physical uplink shared channel resource; and notifies the mobile station apparatus of an uplink grant including an indication of transmission of a sounding reference signal. When receiving the indication of transmission of the sounding reference signal included in the uplink grant, the mobile station apparatus transmits the first sounding reference signal to the base station apparatus when the transmission of the first sounding reference signal is set by transmission control information, and transmits the second sounding reference signal to the base station apparatus when the transmission of the second sounding reference signal is set by the transmission control information.