Interference Coordination in Licensed Shared Spectrum
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently coordinating interference in licensed shared radio frequency spectrum, particularly when multiple networks with different priorities share the same frequency band, leading to inefficient resource utilization and potential interference.
Innovation Solution
The implementation of a method where user equipment (UE) and base stations in lower priority networks adjust their transmissions based on over-the-air signaling, identifying network priorities and reducing power or refraining from transmission when a higher priority network is detected, using techniques like listen-before-talk and reference signal measurements to manage interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple networks share the same licensed radio frequency spectrum band, then spectrum utilization is improved, but interference between networks increases
Solution Approach 1:
The patent implements geographic area-based priority assignment where different networks have different priorities in different geographic regions. Nodes transmit geographic area information and priority levels, allowing local adaptation of transmission parameters based on the specific geographic context and neighboring network priorities, thus enabling spectrum sharing while managing interference locally.
Solution Approach 2:
The patent dynamically adjusts transmission parameters (power level, resource allocation) based on detected neighboring network priorities. When a higher priority network is detected, nodes change their transmission parameters to reduce interference, thereby maintaining spectrum utilization while adapting to interference conditions through parameter modification.
2Reliability
If nodes transmit at full power to maximize communication reliability, then communication reliability is improved, but interference to higher priority networks increases
Solution Approach 1:
The patent implements a feedback mechanism where nodes detect over-the-air signaling from neighboring networks to determine their priority levels. Based on this feedback information, nodes adjust their transmission power dynamically - transmitting at full power when no higher priority network is present, and reducing power when higher priority networks are detected, thus balancing reliability with interference management.
Solution Approach 2:
The patent makes transmission power dynamic rather than static. Nodes continuously monitor the radio environment, detect neighboring network priorities through over-the-air signaling, and adjust their transmission power in real-time. This dynamic adaptation allows full power transmission when conditions permit (maintaining reliability) while reducing power when higher priority networks are present (reducing interference).
3Object-affected harmful factors
If nodes perform interference coordination procedures, then interference management is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service interference coordination where each node autonomously performs detection of neighboring networks, determines priority relationships, and adjusts its own transmission parameters without requiring complex centralized coordination or extensive inter-node communication protocols. This self-service approach manages interference while keeping individual node complexity relatively low.
Solution Approach 2:
The patent uses over-the-air signaling as an intermediary mechanism for interference coordination. Instead of requiring direct node-to-node negotiation or complex control plane procedures, nodes exchange priority and geographic information through broadcast reference signals and system information, simplifying the coordination process while achieving effective interference management.
4Object-affected harmful factors
If nodes reduce transmission power to avoid interference, then interference is reduced, but communication efficiency decreases
Solution Approach 1:
The patent makes transmission power dynamic based on real-time detection of higher priority networks. Nodes transmit at reduced power only when higher priority networks are detected in their geographic area, and resume full power transmission when no higher priority networks are present. This dynamic adjustment ensures interference reduction is applied only when necessary, maintaining communication efficiency during normal operation.
Solution Approach 2:
The patent applies power reduction locally and selectively based on geographic area and detected neighboring network priorities. Rather than uniformly reducing power across all transmissions, nodes adjust power only in time-frequency resources and geographic areas where higher priority networks are present, thereby minimizing the impact on overall communication efficiency while achieving local interference management.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described in which wireless nodes may use licensed shared radio frequency spectrum band for communications and one or more neighboring networks may use a same licensed shared radio frequency spectrum band. A second network of the one or more neighboring networks may have priority of use of the licensed shared radio frequency spectrum band within a particular geographic area. Disclosed techniques provide that nodes of each network may indicate an identification of the network, a network priority, or both, in over-the-air signaling. Wireless nodes may determine if another neighboring network is present based on the over-the-air signaling, may determine whether the other network has a higher priority, and may adjust one or more transmissions in the event that a higher priority network is identified, such as through reducing transmission power.