# 定位服务 LCS (Location Services)

定义

中文

定位服务(LCS,Location Services)是3GPP系统中提供移动台位置信息的服务。该服务允许网络或应用获取移动台的地理位置,支持紧急呼叫、导航、位置跟踪等多种应用场景。

English

Location Services (LCS) refers to services that provide location information of a mobile station within the 3GPP system. This service allows networks or applications to obtain the geographic position of the UE, supporting various scenarios such as emergency calls, navigation, and location tracking.

LCS 架构

+--------+     +--------+     +--------+     +--------+
UE<->BSS<->MSC<->HLR
+--------+ +--------+ +--------+ +--------+ | v +--------+
GMLC
+--------+ | v +--------+
LCA
+--------+

LCS 分类

按发起方分类

类型中文英文描述
------------------------
MT-LR终端定位请求Mobile Terminated Location Request网络向移动台请求位置
MO-LR移动台定位请求Mobile Originated Location Request移动台向网络请求位置
NI-LR网络发起的定位Network Initiated Location网络主动发起定位

按定位方式分类

方式中文描述
------------------
Cell-based小区定位基于服务小区 ID
TA-based跟踪区定位基于 TA(Tracking Area)
OTDOA到达时间差Observed Time Difference of Arrival
GNSS卫星定位GPS, GLONASS, Galileo

相关概念

- MT-LR 终端定位请求 - MO-LR 移动台定位请求 - GMLC 网关移动位置中心 - 补充业务

演进

Release新增功能
-------------------
Rel-6初始 LCS 支持
Rel-9紧急呼叫定位
| Rel-14 | 5G 定位增强 |