Priority Indicators for Shared Spectrum Interference Control
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Solution Overview
Problem
Wireless communication systems operating over shared spectrum face challenges in avoiding interference between devices operated by the same or different network operators, necessitating efficient allocation of spectrum resources to ensure interference-free communication.
Innovation Solution
A Spectrum Access Server assigns priority indicators to network operators, which are then allocated to links, allowing for time-varying priority levels for communication, enabling simultaneous transmission on links with overlapping priority indicators while requiring time division multiplexing for disjoint indicators to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple network operators share the same frequency band, then spectrum utilization is improved, but interference between devices increases
Solution Approach 1:
The patent segments the shared frequency band into multiple priority levels (e.g., priority 0 through priority 7) that different network operators can access. Each operator is assigned specific priority levels based on service requirements, allowing simultaneous operation at different priority tiers while managing interference through hierarchical access control.
Solution Approach 2:
The patent changes the parameter of spectrum access by introducing time-varying priority indicators that map to different priority levels at different times. This allows dynamic adjustment of which operators can transmit at any given moment, resolving interference conflicts by switching priority assignments over time rather than maintaining static allocations.
2Object-generated harmful factors
If medium-sensing procedures like LBT are used to avoid interference, then interference avoidance is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-assigning priority levels and determining coexistence parameters before actual transmission occurs. The coexistence parameters are calculated in advance based on path loss measurements and interference thresholds, allowing devices to make simple binary decisions (transmit or refrain) rather than continuously performing complex sensing and calculation.
Solution Approach 2:
The patent introduces coexistence parameters as an intermediary that mediates between multiple operators sharing the spectrum. These parameters, provided by a serving operator, encode complex interference management rules in a simplified form that other operators can use to make transmission decisions without directly implementing complex sensing procedures.
3Object-generated harmful factors
If priority indicators are assigned to manage interference, then interference control is improved, but coordination overhead increases
Solution Approach 1:
The patent applies partial action by having each operator provide coexistence parameters only to its own served devices, rather than coordinating with all other operators and devices in the system. This localized approach reduces coordination overhead while still achieving interference control for each operator's transmissions.
Data Source
AI summary
A method or apparatus for wireless communication at a scheduling entity communicating with a plurality of devices over a plurality of links in a shared spectrum in a way to avoid undue interference among the plurality of links. The apparatus receives a set of priority indicators, each priority indicator corresponding to time varying priorities for communicating over the plurality of links. The apparatus assigns each of the plurality of links a subset of the set of priority indicators. Each priority indicator maps to a time varying priority level for the communication during each of a plurality of frames. The apparatus may also receive an indication of a mapping function for determining the corresponding priority level for each priority indicator according to a frame number. Links assigned disjoint priority indicators may have TDM transmissions, whereas links having an overlapping priority indicator may have simultaneous transmissions.