System Information Delivery in Co-Channel Interference HetNet
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Solution Overview
Problem
Existing methods fail to reliably deliver system information to victim User Equipments (UEs) in the dominant co-channel interference region of a victim cell within a Heterogeneous Network (HetNet) environment, leading to acquisition failures and reduced reliability.
Innovation Solution
A method and system that trigger victim UEs during the Broadcast Control Channel (BCCH) modification period to apply a new signaling procedure for acquiring updated system information, delivering it in a new message block within a subframe protected by Almost Blank Subframe (ABS) of an aggressor cell, improving system information acquisition reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If legacy system information acquisition procedure is used for victim UEs in dominant co-channel interference region, then the procedure is simple and follows standard protocol, but the system information acquisition reliability is low and acquisition fails frequently
Solution Approach 1:
The patent applies local quality by differentiating the system information acquisition procedure based on UE location and interference conditions. Victim UEs in dominant co-channel interference region are identified through measurement resource restriction patterns and are provided with a dedicated new signaling procedure, while other UEs continue using the legacy procedure. This localized approach improves reliability for affected UEs without impacting the simplicity of the overall system.
Solution Approach 2:
The patent implements dynamics by introducing a dynamic triggering mechanism that activates the new signaling procedure only when needed. The network dynamically identifies victim UEs based on their measurement resource restriction patterns and dynamically switches them to the new procedure for system information acquisition. This dynamic adaptation allows the system to maintain simplicity for most UEs while providing enhanced reliability when interference conditions require it.
2Reliability
If system information is delivered using traditional broadcast method, then the delivery mechanism is simple and widely compatible, but the delivery reliability is reduced due to co-channel interference from aggressor cells
Solution Approach 1:
The patent applies segmentation by dividing the system information delivery into two distinct mechanisms: the legacy broadcast method for general UEs and a new targeted delivery mechanism for victim UEs. The new mechanism segments the delivery process by identifying victim UEs through measurement resource restriction patterns and providing them with dedicated system information transmission opportunities protected from aggressor cell interference, thereby improving reliability without requiring complete system redesign.
Solution Approach 2:
The patent uses measurement resource restriction patterns as an intermediary mechanism to identify and select victim UEs who require the new delivery procedure. These patterns act as a mediator between the network and affected UEs, enabling the network to dynamically determine which UEs need protected delivery without requiring direct complex signaling to all UEs. This intermediary approach improves delivery reliability for victim UEs while maintaining system simplicity.
3Reliability
If ABS-based ICIC is implemented to protect data channels, then co-channel interference is reduced for connected mode UEs, but system information acquisition is not protected and remains vulnerable to interference
Solution Approach 1:
The patent applies preliminary action by preparing and configuring measurement resource restriction patterns in advance for victim UEs. These patterns are pre-configured to identify UEs that will need protected system information delivery. When system information acquisition is required, the network can immediately activate the new signaling procedure for identified victim UEs without needing to perform complex real-time analysis, thereby improving reliability while limiting the complexity increase to configuration rather than execution.
4Reliability
If new signaling procedure is triggered for all UEs during BCCH modification period, then system information acquisition reliability is improved, but the complexity of system management increases and legacy procedure is disrupted
Solution Approach 1:
The patent resolves this contradiction by applying local quality through targeted differentiation. The new signaling procedure is triggered only for victim UEs identified through measurement resource restriction patterns, while other UEs continue using the legacy procedure. This localized application improves reliability for affected UEs without disrupting the simplicity of system management for the majority of UEs, avoiding the need to manage two procedures simultaneously across the entire network.
Data Source
AI summary
A method and system to deliver updated system information to one or more victim User Equipments (UEs) in connected mode within the dominant co-channel interference region in Heterogeneous Network (HetNet) environment is disclosed. The method enables the base station of a victim cell to trigger one or more victim UEs in the region of co-channel interference to apply a new signaling procedure for acquiring a new message block to be delivered by the victim cell. The method provides an error handling procedure for system information acquisition failure by the victim UE in the dominant co-channel interference region of the victim cell in HetNet. The method improves reliability of updated system information delivery and improves probability of system information acquisition in region of dominant co-channel interference.