LTE Receiver Switching for Link Reliability and Battery Life
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Solution Overview
Problem
In LTE wireless mobile devices, there is a trade-off between link performance and battery life due to sub-optimal RF conditions, which existing receiver designs struggle to address effectively, leading to frequent dropped connections and increased power dissipation.
Innovation Solution
Implementing a state-dependent advanced receiver processing method that switches between basic and advanced receivers based on Hybrid-ARQ feedback and RF channel quality metrics, enabling the advanced receiver only during sub-optimal conditions to improve decoding performance while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single basic receiver design is used to address varying RF conditions, then power dissipation performance is maintained, but link performance deteriorates under sub-optimal RF conditions
Solution Approach 1:
The receiver dynamically switches between basic and advanced processing modes based on RF condition state. The system monitors RF conditions and activates advanced receiver processing only when sub-optimal conditions are detected, otherwise using basic processing. This dynamic adaptation resolves the contradiction by adjusting processing complexity according to actual needs, improving link performance when required while maintaining low power consumption during normal operation.
2Reliability
If advanced decoding algorithms are used to improve link performance, then decoding success rate increases, but power dissipation increases
Solution Approach 1:
The system changes the processing parameter (algorithm complexity) based on RF condition state. When RF conditions are good, basic decoding algorithms are used with lower power consumption. When sub-optimal conditions are detected, the system switches to advanced decoding algorithms with higher computational complexity and power consumption, but only for the duration needed to successfully decode the retransmission. This parameter adaptation resolves the contradiction by matching algorithm complexity to actual channel conditions.
3Reliability
If the advanced receiver is enabled continuously to handle sub-optimal RF conditions, then link quality improves, but battery life deteriorates
Solution Approach 1:
The advanced receiver is activated periodically and temporarily only when sub-optimal RF conditions are detected, rather than continuously. The system monitors for specific trigger conditions (such as HARQ NAK acknowledgments indicating failed decoding) and enables advanced processing only during these specific periods. This periodic, condition-based activation improves link quality when needed while minimizing the duration of high-power operation, thus preserving battery life.
Data Source
AI summary
A method for receiver processing in a 3GPP Long Term Evolution (LTE) receiver processing chain in a wireless mobile device is provided. LTE initial sub-frame transmitted from a base station is received on a LTE signalling channel. The sub-frame is received using a basic receiver. An integrity check is performed to determine if the sub-frame was demodulated and decoded correctly by the basic receiver. An advanced receiver is enabled prior to receiving an expected retransmission sub-frame based upon the integrity check failing and a hybrid-acknowledgement request (HARQ) negative acknowledgement (NAK) being sent by the wireless mobile device. The retransmission sub-frame is received using the advanced receiver. The basic receiver is enabled when the integrity check of the retransmission sub-frame passes and a acknowledgement (ACK) is by the wireless mobile device or a new data indicator (NDI) is set in a control channel indicating that the transmission is an initial transmission.