UE-Specific Biasing for Cell Range Expansion Load Balancing
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Solution Overview
Problem
In LTE HetNets, the disparity in transmit power between macro and small eNBs leads to limited cell range expansion, resulting in uneven data rates and load distribution among user equipments, as current handover parameters are not flexible enough to account for UE-specific capabilities and mobility speeds, limiting effective load balancing and user QoS.
Innovation Solution
The system provides UE-specific or UE group-specific biasing adjustment parameters for cell range expansion, determined by attribute information such as LTE release version and mobility speed, allowing for flexible handover settings and coordinated adjustments between macro and small cells to enhance load balancing and user QoS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cell range expansion is applied using common handover parameters for all UEs, then load balancing between macro and small eNBs is improved, but UE-specific QoS and network efficiency deteriorate due to inability to account for different UE capabilities and mobility speeds
Solution Approach 1:
The patent segments the handover parameter adjustment into UE-specific components. Instead of applying a single common CIO value to all UEs, the system divides UEs into different groups or treats them individually based on their attributes (mobility speed, capability version). Each UE or UE group receives customized biasing adjustment parameters, allowing simultaneous optimization for load balancing and UE-specific QoS requirements.
Solution Approach 2:
The patent introduces dynamic adjustment of handover parameters based on real-time UE conditions. The biasing adjustment parameters are determined according to UE mobility speed and capability attributes, making the system adaptive rather than static. This dynamic approach allows the network to optimize handover behavior for each UE based on its current state, resolving the contradiction between common load balancing and individual QoS.
2Area of stationary object
If handover parameters are adjusted to expand small cell coverage, then cell range expansion is improved, but handover coordination between eNBs becomes more complex
Solution Approach 1:
The patent applies local quality by making handover parameters cell-specific and UE-specific rather than uniform across the network. Each eNB can independently adjust biasing parameters for its neighboring cells based on local traffic conditions and UE characteristics. This localized approach enables coverage expansion while managing coordination complexity through distributed decision-making rather than centralized control.
Solution Approach 2:
The patent changes the handover parameter structure by introducing UE-specific biasing adjustment parameters in addition to the traditional common CIO. This parameter expansion allows the system to achieve cell range expansion for coverage improvement while maintaining simpler coordination mechanisms through standardized parameter definitions and adjustment rules that account for UE diversity.
3Ease of manufacture
If common CIO values are used for handover, then configuration simplicity is maintained, but fairness in data rate distribution among UEs deteriorates
Solution Approach 1:
The patent achieves universality by designing a handover parameter system that serves multiple functions simultaneously. The UE-specific biasing adjustment mechanism can operate with a single UE attribute (mobility speed) or multiple attributes (mobility speed plus capability version), providing both simple and sophisticated operation modes. This multi-functional design maintains configuration simplicity for basic scenarios while enabling fair data rate distribution through advanced UE-specific optimization when needed.
Data Source
AI summary
The present invention aims to provide method, apparatuses and systems for providing UE with biasing adjustment parameters about cell range expansion in a heterogeneous network. Herein, a current eNB determines, based on attribute information of one or more user equipments to be handed over, biasing adjustment parameters about cell range expansion of the one or more user equipments corresponding to their target eNB, and sends the biasing adjustment parameters to the one or more user equipments; the one or more user equipments adjust, based on the biasing adjustment biasing adjustment parameters, its report trigger condition of measurement report on measurement report on the current eNB and the target eNB, and report, the measurement report on the current eNB and the target eNB to the current eNB when the report trigger condition is satisfied; the current eNB makes a handover decision for corresponding user equipment(s) based on the measurement report. The present invention realizes a more flexible handover setting for the CRE load balancing and enhances the network efficiency and user QoS.