When LTE Arrived, Optimization Still Lived in 3G LTE / WCDMA · IRAT · multi-vendor 7 min read LTE rollouts were accelerating, and expectations were straightforward: LTE would fix performance problems. What actually happened was more complicated. LTE exposed weaknesses that had been quietly tolerated in the legacy layer beneath it. The first surprise was that LTE performance was tightly coupled to how well 3G was already optimized. A well-tuned LTE layer sitting on top of a poorly tuned WCDMA layer did not produce a good user experience. It just moved the failure point. Inter-layer coordination failures In many markets, LTE coverage looked solid, but user experience degraded during mobility and fallback scenarios. The problem was not LTE radio quality. It was inter-layer coordination. Incomplete neighbor relations, poorly prioritized reselection parameters, and inconsistent IRAT thresholds caused devices to bounce between LTE and WCDMA in ways neith...
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Showing posts from May, 2013