22.0713GPPLocation Services (LCS)Release 17Service descriptionStage 1TS
For the purposes of the present document, in addition to 3GPP TR.21.905, the following abbreviations apply:
BDS BeiDou Navigation Satellite System
BLE Bluetooth Low Energy
EGNOS European Geographic Navigation Overlay System
E-OTD Enhanced Observed Time Difference
GAGAN GPS Aided Geo Augmented Navigation (or GPS and Geo Augmented Navigation)
GLONASS GLObal NAvigation Satellite System
GNSS Global Navigation Satellite System
IPDL-OTDOA Idle Period Downlink- Observed Time Difference Of Arrival
LCS Location Service
MSAS Multi-functional Satellite Augmentation System
NA-ESRD North American Emergency Services Routing Digits
NA-ESRK North American Emergency Services Routing Key
NANP North American Numbering Plan
PSAP Public Safety Answering Point
QZSS Quasi Zenith Satellite System
SBAS Satellite Based Augmentation Systems
TBS Terrestrial Beacon Systems
U-TDOA Uplink Time Difference of Arrival
WAAS Wide Area Augmentation System
NOTE: In the present document, acronyms are used in the text as if they are read either in their fully expanded form or in their alphabet names with no consistent principle.
For the purposes of the present document the following definitions apply:
Change of Area: is one event supported for deferred Location Requests. Change of Area means that the network is required to report the location or the occurrence of the event of the requested subscriber in triggered fashion immediately after the network (MSC/SGSN) processes the mobility event for the new location of the subscriber. Usually new location is noticed after the Location Update, Tracking Area Update, Handover, RAU, Registration or RANAP Location Report, e.g. when the SAI changes.
Codeword: access code, which is used by a Requestor or LCS Client in order to gain acceptance of a location request for a Target UE. The codeword is part of the privacy information that may be registered by a Target UE user.
Current Location: after a location attempt has successfully delivered a location estimate or Dispatchable Location and its associated time stamp, the location estimate or Dispatchable Location and time stamp are referred to as the ‘current location’ at that point in time.
Deferred location request: a location request where the location response (responses) is (are) required after specific event has occurred. Event may or may not occur immediately. In addition, event may occur many times.
Dispatchable Location: The civic location of a UE and/or a valid Mobile Equipment (ME), expressed as civic data (e.g. floor, street number, city.) The Dispatchable Location shall be represented in a well-defined universal format. Regional regulations may specify the mandatory and optional elements in this universal format to be included in a Dispatchable Location.
Immediate location request: a location request where a single location response only is required immediately.
Initial Location: in the context of an originating emergency call the location estimate or Dispatchable Location and the associated time stamp at the commencement of the call set-up is referred to as ‘initial location’.
Last Known Location: The current location estimate or Dispatchable Location and the associated time stamp for Target UE stored in the LCS Server is referred to as the ‘last known location’ and until replaced by a later location estimate or Dispatchable Location and a new time stamp is referred to as the ‘last known location’.
LCS Client: a software and/or hardware entity that interacts with an LCS Server for the purpose of obtaining location information for one or more Mobile Stations. LCS Clients subscribe to LCS in order to obtain location information. LCS Clients may or may not interact with human users. The LCS Client is responsible for formatting and presenting data and managing the user interface (dialogue). The LCS Client is identified by a unique international identification, e.g. E.164.
NOTE: The LCS Client may reside inside or outside the PLMN.
LCS Client Access barring list: an optional list of MSISDNs per LCS Client where the LCS Client is not allowed to locate any MSISDN therein.
LCS Client Subscription Profile: a collection of subscription attributes of LCS related parameters that have been agreed for a contractual period of time between the LCS client and the service provider.
LCS Feature: the capability of a PLMN to support LCS Client/server interactions for locating Target UEs.
LCS Server: a software and/or hardware entity offering LCS capabilities. The LCS Server accepts requests, services requests, and sends back responses to the received requests. The LCS server consists of LCS components which are distributed to one or more PLMN and/or service provider.
Location Estimate: the geographic location of a UE and/or a valid Mobile Equipment (ME), expressed in latitude and longitude data. The Location Estimate shall be represented in a well-defined universal format. Translation from this universal format to another geographic location system may be supported, although the details are considered outside the scope of the primitive services.
NG-RAN: a radio access network connecting to the 5G core network which uses NR, E-UTRA, or both.
North American Emergency Services Routing Digits (NA-ESRD): a telephone number in the North American Numbering Plan (NANP) that can be used to identify a North American emergency services provider and its associated LCS client. The ESRD also identifies the base station, cell site or sector from which a North American emergency call originates.
North American Emergency Services Routing Key (NA-ESRK): a telephone number in the North American Numbering Plan (NANP) assigned to an emergency services call by a North American VPLMN for the duration of the call. The NA-ESRK is used to identify (e.g. route to) both the emergency services provider and the switch in the VPLMN currently serving the emergency caller. During the lifetime of an emergency services call, the NA-ESRK also identifies the calling mobile subscriber.
PLMN Access barring list: an optional list of MSISDN per PLMN where any LCS Client is not allowed to locate any MSISDN therein except for certain exceptional cases.
Privacy Class: list of LCS Clients defined within a privacy exception class to which permission may be granted to locate the target UE. The permission shall be granted either on activation by the target UE or permanently for a contractual period of time agreed between the target UE and the service provider.
Service Identifier: A service provided by an LCS Client is identified by a Service Identifier. One LCS client may have one or more services. The combination of the LCS client Identifier and the Service Identifier constitutes a unique identification of a service.
Privacy Exception List: a list consisting of various types of privacy classes (i.e. operator related, personal etc.). Certain types of classes may require agreement between the service provider and the target UE.
Requestor: an originating entity, which has requested the location of the target UE from the LCS client.
Target UE: The UE being positioned.
Target UE Subscription Profile: the profile detailing the subscription to various types of privacy classes.
UE available: deferred Location Request event in which the MSC/SGSN has established a contact with the UE. Note, this event is considered to be applicable when the UE is temporarily unavailable due to inaction by the UE user, temporarily loss of radio connectivity or IMSI detach and so on. Note that IMSI detach is only applicable in the case UE has previously been registered and information is still kept in the node.