| 翻訳と辞書 |
OTDOA
OTDOA (Observed Time Difference Of Arrival) is a positioning feature introduced in rel9 E-UTRA (LTE radio). It's a multilateration method in which the User Equipment (UE) measures the time difference between some specific signals from several enodeBs and reports these time differences to a specific device in the network (the ESMLC). The ESMLC based on these time differences and knowledge of the enodeBs locations calculates the UEs' position.
== Background ==
In December 2008, due to regulatory requirements like the E911, which require that it should be possible to locate UEs with a certain accuracy, a work item was proposed in the 3GPP TSG-RAN42 meeting.〔(Positioning Support for LTE )〕 This proposed between others the study of the feasibility of OTDOA. OTDOA was meant to work in a similar way as the 3G IPL feature.
During the summer of 2009 the necessary changes to the RAN1 36.211,〔(3GPP TS 36.211 E-UTRA Physical channels and modulation )〕 36.212,〔(3GPP TS 36.212 E-UTRA Multiplexing and channel coding )〕 36.213〔(3GPP TS 36.213 E-UTRA Physical layer procedures )〕 and 36.214〔(3GPP TS 36.214 E-UTRA Physical layer; Measurements )〕 specifications were accepted. And a bit later the RAN4〔(E-UTRA Requirements for support of radio resource management )〕 requirements and RAN2〔(E-UTRA LTE Positioning Protocol (LPP) )〕 protocol related matters settled.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「OTDOA」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|