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Three types of cellar wireless networks are introduced. They cover different cellar areas and are applicable to different wireless communication scenarios. In general, a macrocellar network covers the largest area, but requires the highest transmission power and shows the lowest spectrum efficiency. In contrast, a picocell network transmits the weakest radio signal to cover the smallest area like a conference room. It achieves the best spectrum efficiency.
Posted: 2006-10-23
Category: Mobile Phones
In cellular wireless networks, it is very important to deal with Mobile station (MS) handoff between cells so that they can maintain a continuous and QoS-guaranteed service. There are four basic types of handoff protocols; network-controlled handoff (NCHO), mobile-assisted handoff (MAHO), soft handoff (SHO), and mobile-controlled handoff (MCHO). From NCHO to MCHO, the control protocols tend to decentralize the decision making process, which help shorten handoff delays; however, meanwhile, the decentralization makes the measurement information available to make a handoff decision also decreased. Next, we briefly introduce these four types of handoff mechanisms.
Posted: 2006-10-18
Category: Mobile Phones
In contrast to the past voice-oriented network implementation, today’s networks can efficiently support IP services while providing a huge amount of capacity in the most scalable and flexible way. They are also much intelligent to handle end-to-end service provisioning, quality of service, and network failure recovery. Meanwhile, a slimmer network layer architecture also helps the today’s networks grow faster but cheaper.
Posted: 2006-10-14
Category: Broadband
