UE Power Control via Discontinuous Reception in Multi-Carrier Systems
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Solution Overview
Problem
In wireless communication systems using multiple carriers, user equipment (UE) faces challenges in efficiently managing power consumption during downlink multi-carrier reception, particularly due to the difficulty in controlling power associated with downlink traffic reception without additional signaling for scheduling.
Innovation Solution
The UE employs a method to perform power control by receiving control information from the base station, which indicates the activation time, valid period, or discontinuous reception mode for carrier aggregation, allowing it to operate in multi-carrier or single-carrier reception modes based on HARQ processes, thereby optimizing power state management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors multiple carriers for downlink traffic reception, then data reception quality is maintained, but power consumption increases significantly
Solution Approach 1:
The UE implements discontinuous reception (DRX) by periodically monitoring multiple carriers only during activated time intervals rather than continuously. The monitoring is triggered by valid period indicators received from the base station, allowing the UE to enter low-power states between monitoring periods while maintaining data reception capability when traffic is present.
Solution Approach 2:
The UE dynamically adjusts its carrier monitoring behavior based on reception mode indicators and valid period information received from the base station. The system transitions between different operational states (continuous monitoring, discontinuous monitoring, and sleep modes) depending on traffic conditions and network requirements, optimizing the balance between reception quality and power consumption.
2Adaptability or versatility
If the UE operates in multi-carrier reception mode, then data reception capability is enhanced, but power consumption increases
Solution Approach 1:
The UE segments its carrier reception operations by applying different reception modes to different carriers based on received indicators. Instead of uniformly monitoring all carriers in multi-carrier mode, the UE selectively activates monitoring for specific carriers that have valid period indicators or are designated for traffic reception, reducing overall power consumption while maintaining enhanced data reception capability where needed.
Solution Approach 2:
The UE applies different quality levels of carrier monitoring to different carriers based on local conditions indicated by the base station. Some carriers are monitored with full attention in multi-carrier mode, while others are monitored discontinuously or not at all, depending on traffic patterns and network requirements. This localized approach maintains reception capability for important carriers while reducing power consumption overall.
3Speed
If the UE activates multi-carrier reception continuously, then network responsiveness is improved, but battery life is reduced
Solution Approach 1:
The UE maintains network responsiveness by periodically monitoring carriers during activated intervals defined by valid period indicators from the base station. Rather than continuous monitoring, the UE wakes up at scheduled intervals to check for downlink traffic and network assignments, then returns to low-power state. This periodic monitoring preserves network responsiveness for actual traffic while extending battery life through reduced continuous operation.
Solution Approach 2:
The UE autonomously manages its power state transitions based on received valid period indicators and reception mode information. The system self-regulates between active monitoring and low-power states without requiring continuous network control signals, making efficient use of battery life while maintaining the ability to respond to network traffic when needed.
Data Source
AI summary
A method of activating or deactivating frequency resources at a terminal configured with a primary frequency resource and one or more non-primary frequency resources in a wireless communication system, and the terminal are discussed. The method according to one embodiment includes receiving a medium access control (MAC) signal for activating the one or more non-primary frequency resources; activating the one or more non-primary frequency resources; and deactivating the one or more non-primary frequency resources on expiry of a specific time period configured by radio resource control (RRC) signaling, the specific time period being for which of the one or more non-primary frequency resources are activated.