Active Set Management Based on Codec Quality
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Solution Overview
Problem
In wireless communication networks, handoffs between coverage areas can disrupt communication quality due to differences in codec quality, leading to suboptimal resource allocation and potential drops in service quality.
Innovation Solution
A radio access network (RAN) and wireless communication device (WCD) manage active set parameters based on the codec quality to minimize handoffs when a high-quality codec is assigned, thereby maintaining continuous service by adjusting the maximum number of active sectors and threshold settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handoffs are performed frequently to maintain continuous coverage, then coverage continuity is improved, but communication quality deteriorates due to codec quality differences between sectors
Solution Approach 1:
The patent dynamically adjusts active set management parameters (T_ADD, T_DROP, T_COMP) based on codec quality differences between sectors. When a WCD moves between sectors with different codec qualities, the system modifies threshold parameters to control handoff behavior, thereby maintaining coverage continuity while minimizing quality degradation from unnecessary handoffs.
Solution Approach 2:
The system implements feedback mechanisms where the RAN monitors codec quality differences and uses this information to adjust active set management parameters in real-time. This feedback loop enables the system to adapt handoff thresholds based on actual codec quality variations, preventing unnecessary handoffs that would degrade communication quality.
2Object-affected harmful factors
If active set parameters are adjusted to reduce handoffs, then communication quality is improved, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent introduces codec-quality-aware parameters (Q_ADD, Q_DROP, Q_COMP) that are derived from codec quality differences. These parameters enable the system to distinguish between handoffs that improve quality and those that degrade it, allowing for more efficient resource allocation by preventing only the harmful handoffs while maintaining necessary ones for coverage continuity.
Solution Approach 2:
The system dynamically adjusts active set management parameters based on real-time codec quality conditions. Rather than using fixed thresholds, the parameters are adapted according to the specific codec quality differences between source and target sectors, enabling flexible resource allocation that optimizes both communication quality and network efficiency.
3Object-affected harmful factors
If codec quality differences between sectors are considered in active set management, then handoff optimization is improved, but system complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism where the RAN acts as a mediator between WCDs and sectors with different codec qualities. The RAN calculates and manages the quality-based parameters (Q_ADD, Q_DROP, Q_COMP) and communicates them to WCDs through system information messages, thereby centralizing the complexity in the network infrastructure rather than in individual devices.
Solution Approach 2:
The system uses a universal approach by extending existing active set management parameters with quality-aware counterparts. The same parameter structure (T_ADD/Q_ADD, T_DROP/Q_DROP, T_COMP/Q_COMP) is applied across all sectors, providing a scalable framework that handles codec quality differences without requiring fundamentally new management mechanisms.
Data Source
AI summary
Embodiments may involve the adjustment of the way in which coverage areas are included in the active set of a wireless communication device (WCD), based on the codec that is currently associated with the WCD. An illustrative method involves a radio access network (RAN): (a) determining a codec that is associated with a WCD; (b) using the associated codec as a basis for determining a value for at least one active-set parameter for the WCD; and (c) sending a message to the WCD, wherein the message indicates the determined value for the at least one active-set parameter.