By Y. Jay Guo
An engineer with an extended history in radio communications, and now with a British corporation, Guo surveys the applied sciences for advancements in cellular radio entry networks from the point of view of process engineering, focusing in most cases on high-level architectural concerns. He highlights some great benefits of complex applied sciences, but in addition discusses significant theoretical and functional difficulties that they bring up for process designers. between his themes are linear transmitters, superconducting filters and cryogenic radio frequency entrance head, radio over fiber, software program radio base stations, cellular terminal positioning, and excessive- velocity downlink packet entry.
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Extra info for Advances in Mobile Radio Access Networks
The cells to be measured should include those in the active set and the monitored set for handover. In order to support the OTDOA method, the positions of the UTRAN transmitters (base station antennas) need to be accurately known by the calculation function in SRNC or stand-alone SMLC (SAS) or UE. This information may be measured by appropriate conventional surveying techniques. The location estimate is performed by a position calculation function (PCF) located in the network or in the UE itself.
The most important correction technique is differential GPS (DGPS). It uses a reference receiver at a surveyed position to send correcting information to a mobile receiver over a communications link. Generally speaking, it is difficult to employ a traditional autonomous GPS receiver in mobile terminals for the following reasons. First, its start-up time, which is defined as the period from turning on to the initial position fix, is relatively long due to the long acquisition time of the navigation message ranging from 30 seconds to a few minutes.
This allows for rapid search speed and for a much narrower signal search bandwidth, which enhances sensitivity. Once the embedded GPS receiver acquires the available satellite signals, the pseudorange measurements can be delivered to network-based position determination entity (PDE) for position calculation or can be used directly by the terminal to compute its position. Additional assisted data, such as DGPS corrections, approximate terminal location, or cell base station location, and other information such as the satellite almanac, ionospheric delay, and universal time coordinated (UTC) offset, can be transmitted to improve the location accuracy, decrease acquisition time, and allow TEAM LinG 40 Advances in Mobile Radio Access Networks for terminal-based position computation.