Dynamic SRS Bandwidth Signaling for Adaptive Channel Estimation
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Solution Overview
Problem
Conventional SRS transmission schemes configure parameters semi-statically, failing to dynamically adjust to changing channel conditions and interference, leading to suboptimal channel estimation and scheduling.
Innovation Solution
Dynamically or semi-persistently adjust SRS parameters, such as bandwidth and antenna ports, via DCI or MAC CE messages, allowing flexible SRS transmissions that reflect current channel conditions and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SRS parameters are configured semi-statically, then device complexity is reduced and ease of operation is improved, but adaptability to changing channel conditions deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning SRS parameter configuration from semi-static to dynamic. The network controller now sends DCI messages that dynamically adjust SRS parameters (bandwidth, antenna ports, frequency domain resources) based on real-time channel conditions, allowing the system to adapt to changing environments while maintaining manageable complexity through standardized message formats.
Solution Approach 2:
The patent implements parameter changes by modifying SRS transmission parameters dynamically through DCI signaling. Specifically, the network controller can change bandwidth parameters, antenna port configurations, and frequency domain resource assignments based on current channel state, enabling the system to adapt to varying channel conditions without requiring complete reconfiguration.
2Measurement precision
If SRS parameters are adjusted dynamically, then adaptability to channel conditions is improved, but signaling overhead and device complexity increase
Solution Approach 1:
The patent applies partial action by selectively adjusting only the necessary SRS parameters through DCI messages rather than reconfiguring all parameters. The network controller sends targeted updates for specific parameters (bandwidth, antenna ports, frequency resources) only when changes are needed, reducing signaling overhead while maintaining channel estimation accuracy.
Solution Approach 2:
The patent implements universality by using the existing DCI message framework for multiple purposes. The same DCI structure used for uplink scheduling is extended to carry SRS parameter adjustments, allowing the signaling mechanism to serve both scheduling and SRS configuration functions, thereby reducing overall signaling overhead.
3Adaptability or versatility
If SRS bandwidth is reduced to a portion, then interference is reduced and scheduling flexibility is improved, but channel estimation coverage is limited
Solution Approach 1:
The patent applies segmentation by dividing the total SRS bandwidth into multiple portions or subbands. The network controller can selectively activate specific bandwidth portions through DCI messages, allowing the system to focus channel estimation on specific frequency regions where interference management is needed while maintaining the capability to expand coverage when conditions improve.
Solution Approach 2:
The patent implements dynamics by making SRS bandwidth configuration flexible and adjustable in real-time. The network controller can dynamically change the activated bandwidth portion based on interference conditions and scheduling requirements, transitioning between narrowband and wideband SRS transmissions as needed to balance coverage and flexibility.
Data Source
AI summary
A network controller may transmit, to a communication device, information about a portion of a sounding reference signal (SRS) bandwidth, where the SRS bandwidth has been configured for the communication device for transmitting a SRS resource set via radio resource control (RRC) signaling. The communication device may then transmit the SRS resource set in the portion of the SRS bandwidth, upon being triggered by a downlink control information (DCI) message. The information about the portion of the SRS bandwidth may be transmitted in a DCI message or a medium access control (MAC) control element (CE).