Variable Active Period DRX for Connected UE Power Efficiency
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Solution Overview
Problem
Conventional Discontinuous Reception (DRX) operations in mobile communication systems are not feasible for connected UEs in LTE systems, as they require a fixed active period, which does not account for varying packet data amounts, leading to inefficient power consumption and reception performance.
Innovation Solution
A method and apparatus for a connected UE to perform DRX with a variable active period, adjusting the length based on the amount of packet data, using information from the base station to derive the starting position and timer lengths, and extending or terminating the active state accordingly, ensuring efficient data reception and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a fixed active period is used in conventional DRX operations, then the UE can maintain simple reception timing, but the power consumption efficiency deteriorates when packet data amounts vary
Solution Approach 1:
The patent applies dynamics by making the active period length variable rather than fixed. The base station determines the active period length based on the amount of packet data, and the UE adjusts its active period accordingly. This dynamic adjustment allows the system to adapt to varying traffic conditions - extending the active period when more data is expected and shortening it when less data is expected, thereby improving power consumption efficiency while maintaining adaptability.
2Reliability
If the active period is extended to accommodate larger packet data amounts, then packet reception performance improves, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the active period length parameter based on the amount of packet data. The base station determines the appropriate active period length and communicates it to the UE, which then configures its reception window accordingly. This ensures that the active period is sufficiently long to receive all expected packets (maintaining reliability) but not excessively long (controlling power consumption).
3Use of energy by moving object
If the active period is shortened to reduce power consumption, then power efficiency improves, but packet reception reliability deteriorates
Solution Approach 1:
The patent applies feedback by having the base station determine the active period length based on knowledge of the packet data amount, and communicating this determination to the UE. The base station, which has information about the data transmission schedule, provides feedback to the UE about the appropriate active period length, ensuring that the UE's reception window is properly configured to receive all packets reliably while minimizing power consumption.
4Device complexity
If conventional DRX with fixed timing is used, then the system operation is simple, but it cannot adapt to service characteristics in LTE connected mode
Solution Approach 1:
The patent transitions from static fixed timing to dynamic adaptive timing. The base station determines the active period length based on service characteristics and packet data amount, and the UE dynamically adjusts its active period accordingly. This maintains relatively simple operation procedures while significantly improving adaptability to different service types and traffic conditions in LTE connected mode.
Data Source
AI summary
A method and apparatus are provided for controlling an active state in a mobile communication system. The method includes receiving, from a base station, information related to a starting position of an active state and information related to a length of a first timer; deriving the starting position of the active state based on the information related to the starting position; starting the first timer set to the length of the first timer and entering the active state at the derived starting position; terminating the active state if control data indicating a transmission of user data is not received until the first timer expires; extending a period of the active state if the control data is received before the first timer expires; and terminating the active state based on a control signal indicating a termination of the active state.