Optimized DRX Mode for Mobile Station Power Management
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Solution Overview
Problem
In GSM/GPRS/EDGE networks, the non-discontinuous reception (DRX) mode in mobile stations consumes more power, leading to faster battery drain, as they must continuously decode common control channels, which is inefficient and affects autonomy during idle mode due to frequent TBF setups and releases.
Innovation Solution
Implementing an optimized DRX mode controlled by network messages, where the mobile station adjusts its non-DRX timer based on network support, data types, and user inputs to balance battery conservation with data speed, allowing autonomous transitions between DRX and listening periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the mobile station operates in non-DRX mode to enable faster data session establishment, then the data speed and network responsiveness are improved, but the power consumption increases and battery life decreases
Solution Approach 1:
The patent implements dynamic switching between DRX and non-DRX modes based on network conditions and data activity. The mobile station transitions from static operation in one mode to dynamic adaptation, adjusting its reception behavior according to whether data is actually being transmitted, thereby resolving the contradiction between speed and power consumption.
Solution Approach 2:
The patent changes the operational parameters of the mobile station by introducing DRX cycles with variable lengths. The system modifies the reception pattern parameter from continuous (non-DRX) to periodic (DRX), and further optimizes by adjusting the DRX cycle length based on network feedback and data activity, thus reducing power consumption while maintaining acceptable data session establishment speed.
2Productivity
If the mobile station continuously decodes common control channels in non-DRX mode, then the network responsiveness and data transfer speed are improved, but the battery autonomy deteriorates
Solution Approach 1:
The patent applies periodic action by implementing DRX cycles where the mobile station alternates between active reception periods and sleep periods. Instead of continuous decoding, the station decodes control channels periodically at defined intervals, which maintains network responsiveness while dramatically reducing battery consumption, thus resolving the contradiction between productivity and duration.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining the ability to quickly establish data sessions when needed. The DRX mechanism is designed so that when data transmission is required, the mobile station can transition from DRX to active mode rapidly, ensuring that the useful action of data transfer remains continuous and uninterrupted despite periodic sleeping.
3Speed
If the mobile station enters non-DRX mode after TBF release to enable faster downlink TBF establishment, then the downlink data transfer speed is improved, but the power consumption increases
Solution Approach 1:
The patent applies preliminary action by having the mobile station enter non-DRX mode proactively after TBF release when there is an anticipated need for quick downlink data session establishment. However, this non-DRX state is temporary and automatically transitions back to DRX mode after a timer expires or when no data activity is detected, thus achieving fast reconnection when needed while minimizing energy loss through limited duration.
Data Source
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AI summary
Methods and apparatus for controlling discontinuous reception (DRX) in mobile devices are disclosed. An example method for controlling discontinuous reception includes entering a packet transfer mode, receiving a network message that indicates that the mobile station is to utilize an optimized DRX mode, and entering DRX mode immediately upon leaving packet transfer mode.