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Since mobile devices are equipped with limited battery power, it is essential to have efficient power management mechanisms in mobile broadband networks such as mobile WiMAX that enable always on connectivity and provide high throughputs. In recent times Voice over IP (VoIP) has emerged as an important and dominant application in broadband mobile networks such as WiMAX. VoIP traffic is uniquely characterized...
Radio link failure (RLF) is a common phenomenon in all radio access technologies like GSM or UMTS or wireless-LAN etc., when the radio channel signal strength is weak to continue with the application. RLF is a local event detected by mobile handset (or user equipment-UE) immediately and network nodes come to know later. It is also difficult to recover for the UE due to low signal. Hence, RLF has to...
In the last few years there has been significant work going on for development and deployment of IP multimedia subsystem. There has been several usage scenarios described in a number of work so far. Most of them have been concentrated towards delivery of services for mobile users. However, there have been very few usage scenarios explored in industrial and enterprise domain. There has been some work...
In all radio access technologies, starting with GSM to UMTS and others there exist an event of radio link failure. A radio link failure occurs due to degradation of air interface during an ongoing voice or a data application. The action that has to be taken is defined by their respective specification of 3GPP. Normally, the physical layer (II) detects a radio link failure. When such a failure is found...
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