3 结果
english (pd 3607.0400.12)
location based services (lbs) involves the process of determining where a device is located. global navigation satellite system (gnss) based solutions are highly accurate and the technology of choice for absolute position accuracy, providing the device has a good line-of-sight, but this is not always the case. a device can be in a highly dense urban environment with reduced satellite visibility or indoors with very low signal levels; these limitations of gnss systems have meant that lte cellular based alternatives have been developed within 3gpp release 9 and are described in this white paper.
english (pd 5214.6522.62)