Scalable voip mobility intedration and deployment- P29: The term voice mobility can mean a number of different things to different people. Two words that can be quite trendy by themselves, but stuck together as if forgotten at a bus station long past the last ride of the night, the phrase rings a number of different, and at times discordant, bells. | 280 Chapter 6 Neighbor Reports Beacon Reports Transmit Stream Metrics Quiet Time Power Constraint for setting the transmit power of clients Finally the Voice Enterprise test carries over the voice quality test used for the ten immobile clients and uses the same metrics to measure the quality of one call that is forcibly handed off between two access points of the same vendor. The handoff need not have the same voice quality during the handoff as before but it must not exceed thresholds of 100ms loss or delay as of the time of writing. The test will be performed using automated sophisticated handoff and measurement systems designed to allow for repeatability in measurement. Note that the test is not measuring the handoff performance under density or variability and so is intended to ensure the correctness of the implementation of the underlying protocols and not to measure whether any client handoff decision-making scheme is better than another. The Voice Personal program is new as of this writing but a handful of products are available for purchase that have been certified. The Voice Enterprise certification is still in progress and were not ratified amendments until fall 2008 but may be ready by 2010. Voice Enterprise certification is expected to be available as a software upgrade for vendors that seek the certification. Real Concepts from High-Density Networks Chapter 5 introduced the basics of wireless coverage and Wi-Fi operation and this chapter has already covered some of the technologies that have been bolted onto Wi-Fi to improve its usefulness for voice mobility. This next section will explore steps that voice mobility planners can take to improve the quality of the network. RF Modifications for Voice Mobility One of the keys for voice mobility especially when using a microcell-based architecture is to ensure that the RF plan and various parameters to the automatic planning tools are both set to improve not disrupt the voice .
