Implementation And Research Of Location Service And UTRAN Signaling Process In TD-SCDMA

TD-SCDMA proposed by China is one of the most popular 3G techniques,which is also the future of China's 3G industry.As the developing of the TD-SCDMA business process,and the extending of business trail network,CMCC is going to getting the TD-SCDMA license.Now,all the TD-SCDMA industry development is being in fast step.In this paper,we mainly analysis the key technology in TD-SCDMA,physical layer architecture,UTRAN protocol architecture. Based on those,we focus on the"TD-SCDMA UTRAN Signaling Procedure"and"TD-SCDMA Location Service".First,we analysis the basic signaling procedure of TD-SCDMA UTRAN,and compare the traditional state machine and FSM (Finite State Machine).As the high complexity of 3G protocol and message input principle,we use"multilayer finite state machine"to realize the UTRAN basic signaling procedure. Then,we discuss the history and current solution of LCS. Research all kinds of LCS solution: based on CELL ID, distance(TOA/TDOA/OTDOA),direction,phase of received signal and mixed location service solution.Involving the working principle,location precision,environment influence and usage conditions.Finally,we pay more attention in the most important AOA/TOA mixed location arithmetic of TD-SCDMA.We take deep research of AOA physical definition in TD-SCDMA smart antenna,parameter estimation,measurement procedure realization.Based on those research,we realize the message scenario of AOA/TOA location service arithmetic.And analysis the basic performance, mobility(high speed and low speed),location precise and real time performance, especially the method of NOLS error distinguish and elimination.