Shared Spectrum FDM Access with Priority-Based Channel Intervals
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Solution Overview
Problem
Wireless communications systems operated by different network operators often lack synchronization, leading to inefficient utilization of shared spectrum and increased interference, as network operators contend for resources without proper timing coordination.
Innovation Solution
Implement a prioritization scheme that allocates channel resources based on network operator priorities, allowing for partially synchronized access by designating primary, guaranteed, and opportunistic intervals for channel use, with central arbitration or autonomous determination, and employing medium-sensing procedures to optimize spectrum usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If medium-sensing procedures (LBT) are used to avoid interference between different network operators, then interference is reduced, but spectrum utilization efficiency deteriorates due to lack of synchronization and repeated contention
Solution Approach 1:
The shared spectrum is segmented into multiple channels, and network operators are assigned priority levels for different channels. This segmentation allows operators to access different channels based on their priority without requiring medium-sensing procedures on all channels, thereby reducing contention while maintaining interference avoidance on prioritized channels.
Solution Approach 2:
Priority assignments are determined in advance through central arbitration or autonomous determination before spectrum access. This preliminary action establishes a predetermined access order among network operators, eliminating the need for real-time medium-sensing and contention procedures, thus improving spectrum utilization efficiency while preventing interference through pre-coordinated access.
2Adaptability or versatility
If network operators contend for shared spectrum resources without synchronization, then access flexibility is maintained, but resource utilization efficiency deteriorates due to repeated contention and lack of coordination
Solution Approach 1:
The system implements dynamic priority assignment where network operators can be assigned different priority levels for different channels based on current network conditions and requirements. This dynamic approach maintains access flexibility while improving resource utilization efficiency by directing traffic to appropriate channels without contention.
Solution Approach 2:
A central arbitrator or autonomous determination mechanism acts as an intermediary to assign priorities and coordinate access among network operators. This intermediary establishes a coordinated access framework that maintains flexibility in channel selection while eliminating repeated contention through predetermined priority-based access rules.
3Productivity
If priority-based channel allocation is implemented, then spectrum utilization efficiency is improved, but system complexity increases due to priority assignment and arbitration mechanisms
Solution Approach 1:
Network operators autonomously determine their own priorities and channel assignments based on pre-established rules and their own network conditions, without requiring complex central arbitration. This self-service approach improves spectrum utilization efficiency through priority-based allocation while reducing system complexity by eliminating the need for centralized coordination mechanisms.
Data Source
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AI summary
A network operator may synchronize access for wireless nodes (e.g., base stations) associated with the network operator. However, each network operator of a group of network operators may not synchronize access among the group. A lack of synchronization between network operators intending to utilize shared channels of a wireless communication system may result in a failure to utilize all available network resources. In some aspects, a device associated with a first network operator, of a plurality of network operators, may listen for communications associated with other network operators, of the plurality of network operators in a shared radio frequency spectrum band, during a set of intervals of a transmission opportunity of a channel for which the other network operators have a higher priority, and may communicate, using the channel, with a wireless node associated with the network operator based at least in part on the listening for communications.