Dynamic Spectrum Reallocation for Wireless Terminal Synchronization
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Solution Overview
Problem
In wireless networks without infrastructure, terminals face challenges in synchronizing to a common timing and frequency reference, making it difficult to establish communication links, as existing methods rely on protocols that may not account for terminals being out of sync.
Innovation Solution
The dynamic reallocation of communication frequency spectrum between infrastructure-based and peer-to-peer usage, with base stations transmitting broadcast signals to indicate spectrum usage, allowing terminals to synchronize and communicate effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals use existing protocols for communication setup, then communication can be established with infrastructure support, but terminals cannot synchronize timing and frequency references in peer-to-peer mode
Solution Approach 1:
The base station dynamically switches the frequency band between infrastructure-based and peer-to-peer modes based on real-time needs. Broadcast signals are transmitted to announce mode changes, allowing terminals to adapt their operation dynamically. This resolves the contradiction by enabling both infrastructure mode (for reliable network communication) and peer-to-peer mode (for flexible direct communication) to coexist.
Solution Approach 2:
The system changes the operational parameters of the frequency band by switching between infrastructure-based and peer-to-peer modes. The base station modifies the band's function through parameter changes (mode switching) and uses broadcast signals to communicate these changes to terminals, enabling flexible adaptation while maintaining synchronization capabilities in both modes.
2Productivity
If base station continuously monitors all frequency bands for peer-to-peer communications, then terminal detection capability is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous monitoring, the base station uses periodic broadcast signals to announce peer-to-peer mode availability and frequency band status. Terminals periodically check these broadcasts and synchronize accordingly, reducing the base station's continuous energy consumption while maintaining effective terminal detection and communication setup capability.
3Reliability
If frequency band is dedicated to infrastructure-based communications only, then network service reliability is improved, but peer-to-peer communication capability is lost
Solution Approach 1:
The frequency band is designed to serve multiple functions: it can operate in infrastructure-based mode for network services, peer-to-peer mode for direct terminal communication, or hybrid modes. The base station acts as a flexible controller that can switch the band's function based on demand, making the system universal and adaptable to different communication needs while maintaining reliability in each mode.
Solution Approach 2:
The frequency band's function is made dynamic rather than fixed. The base station can switch between infrastructure-based and peer-to-peer modes based on real-time network conditions and terminal needs, allowing the same frequency band to serve different purposes dynamically while maintaining service reliability in each operational mode.
Data Source
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AI summary
Methods and apparatus supporting the dynamic reallocation of frequency spectrum between (i) network access point based communications spectrum usage and (ii) peer to peer communications spectrum usage are described. A base station transmits broadcast signals, e.g., beacon signals, identifying the current type of designated usage of a frequency band. The base station switches usage designation as a function of wireless terminal access request signals, authorized received change command signals, communications activity level information, and/or priority information.