Extended Reality Quality of Experience Enhancement through Collaborative Bottleneck Detection and Resource Redistribution

Extended reality applications over shared wireless networks face heterogeneous bandwidth and latency demands that current per-user approaches cannot adequately address. This paper proposes Enhanced Bandwidth Trading for Extended Reality (E-BITEX), a collaborative bandwidth-sharing framework that extends Bandwidth Trading for Extended Reality (BITEX) with shared bottleneck detection (SBD) and event-driven resource redistribution for multiuser XR deployments. E-BITEX integrates one-way delay measurement to achieve sub-millisecond precision, SBD-based user grouping leveraging skewness and median absolute deviation metrics, and cross-layer coordination spanning application and transport layers. The framework operates entirely through centralized server-side logic, enabling practical deployment across heterogeneous XR platforms. Comprehensive ns-3 evaluation demonstrates consistent Quality of Experience (QoE) improvements of 15.4%-24.0% over BITEX-V2 and 27.1%-36.9% over TCP-BBR across baseline, background traffic, and moving bottleneck scenarios, while maintaining fairness (Jain Index 0.9939).