Pseudo Unavailability Interval for Mobile Sleep Mode Traffic
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Solution Overview
Problem
Wireless networks face challenges in supporting best effort traffic with high traffic loads and stringent delay requirements during sleep mode, as existing sleep mode mechanisms lead to increased latency and uncontrolled buffering, and require frequent termination and reinitiation of sleep mode to handle variable data transfer.
Innovation Solution
The introduction of a pseudo unavailability interval (PUAI) allows subscriber stations to send and receive traffic without exiting sleep mode, using a pseudo unavailability interval that can be adjusted in duration and frequency to accommodate varying data amounts, reducing latency and buffering while maintaining power savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If subscriber station uses traditional availability interval (AI) for traffic transmission during sleep mode, then power consumption is reduced, but latency increases and delay requirements cannot be met for high-traffic best effort traffic
Solution Approach 1:
The unavailability interval (UAI) is segmented into two parts: a mandatory UAI for power saving, and an optional pseudo-UAI for traffic transmission. This segmentation allows the system to maintain power saving benefits while creating dedicated time windows for data transmission without requiring full wake-up, thus reducing latency for best effort traffic while keeping power consumption low.
2Ease of operation
If subscriber station terminates sleep mode to send/receive traffic, then traffic transmission is enabled, but overhead increases and power saving is reduced
Solution Approach 1:
The system dynamically adjusts the pseudo-UAI parameters (duration, frequency, position) based on traffic requirements and network conditions. The base station can flexibly configure these parameters to match varying traffic patterns, allowing optimal balance between power saving and traffic handling without rigid termination/reinitiation of sleep mode, thereby reducing management overhead.
3Quantity of substance
If availability interval duration is extended to handle more traffic, then traffic load capacity increases, but power consumption increases and sleep mode effectiveness is reduced
Solution Approach 1:
The invention extracts the traffic transmission function from the traditional AI framework and places it in the pseudo-UAI structure. This allows traffic to be transmitted during what would otherwise be a power-saving interval, effectively decoupling traffic handling from power consumption penalties. The radio interface remains in low-power state while enabling targeted data exchange during pseudo-UAI periods.
4Adaptability or versatility
If sleep mode is frequently terminated and reinitiated to handle variable traffic, then traffic adaptability improves, but overhead increases and power efficiency decreases
Solution Approach 1:
The base station preliminarily configures pseudo-UAI parameters based on predicted or declared traffic patterns before the subscriber station enters sleep mode. By pre-negotiating the pseudo-UAI structure (duration, frequency, position), the system prepares for variable traffic needs without requiring frequent sleep mode terminations, thus maintaining adaptability while preserving power efficiency through continuous sleep mode operation.
Data Source
AI summary
Briefly, in accordance with one or more embodiments, a subscriber station in sleep mode is capable of sending and/or receiving traffic during sleep mode without violating the delay requirements of best effort traffic. Moreover, a subscriber station is capable of remaining in sleep and may optionally only be awaken in the event there is data to be transmitted from the base station to the subscriber station and/or from the subscriber station to the base station. By implementing an always sleep and need based wake up arrangement, the power consumption of the subscriber station can be reduced.