Discovery Signal Timing Offsets for Neighboring Cell Interference
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Solution Overview
Problem
Interference between neighboring base stations and user equipments in wireless communication networks, particularly in scenarios where base stations are unable to detect each other's transmissions, leading to inadequate radio resource management and degraded performance.
Innovation Solution
Utilization of discovery signals, such as primary synchronization signals, secondary synchronization signals, and sounding reference signals, to enable network elements to detect neighboring cells and UEs, facilitating efficient radio resource management by provisioning protected resources to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If base stations are deployed to provide added wireless coverage and capacity, then network coverage and capacity are improved, but interference between neighboring base stations increases and radio resource management becomes inadequate
Solution Approach 1:
The patent introduces discovery signals as an intermediary mechanism that enables base stations to detect and identify neighboring base stations and their transmissions. These signals act as mediators that facilitate awareness and coordination between previously undetectable neighboring cells, allowing for improved interference management through discovered timing offset information.
2Area of stationary object
If base stations are deployed in shadow or at far distances to extend coverage, then network coverage is improved, but the ability to detect neighboring base station transmissions is lost
Solution Approach 1:
The patent employs preliminary action by having base stations transmit discovery signals in advance of potential interference scenarios. These signals are sent beforehand to establish timing offset information and enable future interference management. The discovery signals are transmitted during discovery reference signal occasions, allowing base stations to proactively gather information about neighboring cells before interference problems arise.
3Reliability
If traditional listen-before-talk techniques are used, then basic interference avoidance is achieved, but they are ineffective in scenarios where base stations cannot detect each other's transmissions
Solution Approach 1:
The patent changes the parameter of detection by transitioning from energy-based detection (listen-before-talk) to signal-based detection (discovery signals). By altering the detection mechanism to rely on specific transmitted sequences rather than general energy detection, the system gains the ability to identify neighboring base stations even at far distances or in shadow conditions where traditional techniques fail.
Data Source
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AI summary
Systems and methods providing radio resource management (RRM) to facilitate the co-existence of the neighboring cells, such as to manage radio resources for deployments utilizing a same frequency or overlapping frequencies, using discovery signal transmission are disclosed. Discovery signal transmission may be used to enable network elements of a wireless communication system to discover other network elements of the wireless communication system, whether such other network elements are operating with respect to a cell of a same or different operator. Transmission of discovery signals may be utilized to detect situations of dominant interference, whereby the network elements of neighboring cells may provide protected resources for each other. The protected resources may comprise particular frequencies, time slots, channels, etc.