D2D Beacon Window Determination for Mobile Station Power Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In device-to-device (D2D) communication, mobile stations face increased power consumption due to constant scanning or transmission of beacons, which reduces battery life, as they need to locate other devices within the network.
Innovation Solution
Implementing a method where mobile stations use aligned 'beacon windows' for transmission and scanning, selecting these windows based on geographical location coordinates or base station identity, allowing them to reduce the duration of the discovery period and conserve power by only scanning or transmitting during specific times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile stations continuously scan or transmit D2D beacons to locate other devices, then D2D communication discovery capability is improved, but power consumption increases and battery life decreases
Solution Approach 1:
The patent implements periodic beacon transmission and scanning within specific time windows rather than continuous operation. Mobile stations transmit beacons only during designated transmission windows and scan for beacons only during scanning windows, creating a periodic pattern that reduces overall power consumption while maintaining discovery capability. This is achieved by configuring discovery periods with specific window timings and durations.
Solution Approach 2:
The discovery period is segmented into distinct functional windows: transmission windows for beacon sending, scanning windows for beacon reception, and idle periods. This segmentation allows mobile stations to alternate between active transmission/reception modes and low-power states, reducing overall energy consumption while ensuring that discovery functions are performed systematically.
2Use of energy by moving object
If mobile stations reduce the duration of discovery period to conserve power, then battery life is extended, but the ability to locate other devices may be compromised
Solution Approach 1:
By implementing periodic beacon transmission and scanning within compressed time windows, the system maintains effective device location capability despite reduced overall discovery period duration. The periodic nature ensures that beacons are transmitted and scanned at predictable intervals, allowing devices to locate each other reliably while spending more time in low-power states between windows.
Solution Approach 2:
The system performs preliminary synchronization and configuration of beacon window timings based on device identity and location information. Mobile stations pre-determine their transmission and scanning window schedules, allowing them to efficiently locate each other within constrained time periods without requiring extended continuous scanning.
3Use of energy by moving object
If mobile stations use aligned beacon windows for synchronized transmission and scanning, then power consumption is reduced, but coordination complexity increases
Solution Approach 1:
Mobile stations autonomously determine their own beacon transmission and scanning window timings based on their device identity and location information, without requiring complex centralized coordination. Each device independently calculates its window schedule, simplifying the overall system coordination while maintaining synchronization through the periodic structure.
Solution Approach 2:
The system uses device-specific parameters such as mobile station identity and geographical location coordinates to determine beacon window timing offsets. This parameter-based approach allows automatic differentiation of transmission and scanning schedules across multiple devices, reducing coordination complexity while ensuring proper synchronization.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed are methods and devices for determination of beacon windows for device-to-device communication. In one implementation, a common reference time and a set of geographical location coordinates are scanned for by a mobile station. A first beacon region is selected based on the set of geographical location coordinates. A first set of periodic beacon windows is determined based on the first beacon region and the common reference time. A device-to-device beacon transmission is scanned for during a beacon window of the first set of periodic beacon windows.