Dynamic Receiver Bandwidth Adjustment for Mobile Stations
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Solution Overview
Problem
Mobile stations, such as cellular telephone handsets, are required to receive and decode the entire wideband frequency domain channel, even if only a subset of the bandwidth is needed, leading to unnecessary current drain and reduced battery life, as well as decreased receiver sensitivity due to noise contributions from the full bandwidth.
Innovation Solution
A method and apparatus where the receiver bandwidth of a mobile station is dynamically adjusted based on control information to receive only the specific sub-carriers assigned for data, reducing noise integration and processing requirements by modifying the receiver filter bandwidth and center frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station receives and decodes the entire wideband frequency domain channel, then all data can be obtained, but current drain increases and battery life is reduced
Solution Approach 1:
The wideband frequency domain channel is segmented into multiple sub-carriers, and the mobile station selectively receives only the specific sub-carrier(s) assigned for data transmission rather than decoding the entire channel. This segmentation allows the system to divide the broad bandwidth into manageable portions, enabling selective reception that reduces power consumption while maintaining data reception completeness.
2Reliability
If the mobile station receives the entire wideband frequency domain channel, then all data can be obtained, but receiver sensitivity decreases due to noise contributions
Solution Approach 1:
The harmful noise contributions from unused sub-carriers are extracted and excluded from the reception process. By taking out only the necessary sub-carrier(s) that carry the mobile station's data and excluding the rest of the wideband channel, the system prevents noise from non-assigned sub-carriers from degrading receiver sensitivity while still obtaining complete data for the assigned channel.
3Use of energy by moving object
If the receiver bandwidth is reduced to match assigned sub-carriers, then power consumption decreases, but the ability to receive any channel is reduced
Solution Approach 1:
The receiver bandwidth is made dynamic rather than fixed. The mobile station adjusts its receiver bandwidth based on control information that identifies the specific sub-carrier assignments. When a sub-carrier is assigned, the receiver bandwidth expands to include it; when not assigned, the bandwidth contracts to exclude it. This dynamic adaptation allows the system to optimize power consumption for each transmission while maintaining the capability to receive any assigned channel.
Data Source
AI summary
Receiver bandwidth is dynamically altered during operation (with respect to, for example, filter bandwidth and/or filter center frequency) as a function, at least in part, of communication resource allocation.