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EENA 2018 - Advanced Mobile Location - AML
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EENA (European Emergency Number Association)
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International Roaming John Medland, 112/999 Policy Manager, BT, United Kingdom
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EENA 2018 - Advanced Mobile Location - AML
1.
© British Telecommunications
plc 2017 EENA Conference 2018 AML Future – roaming 26 April 2018 – for presentation, not for distribution 1
2.
© British Telecommunications
plc 2017 Key Mobile Networks Aggregation Provider Stage 1 PSAP(BT or contracted supplier) Stage 2 PSAP Google/Apple Location Service Ephemeris provider (eg Qualcomm) Default location used when no AML and to check consistency of handset locations
3.
© British Telecommunications
plc 2017 Roaming way forward Using existing Android ELS software it is possible to:- - Identify a mobile phone is in the UK with a non-UK SIM - Send an SMS to the UK AML destination at the PSAP using a “long number”: a full length number including country code, e.g.+447789012345 Although it looks like a normal mobile phone number it is a virtual mobile equipment number - it doesn’t terminate on a mobile phone, but on the PSAP server This avoids the issue of the foreign SIM’s home SMSC not being able to route the normal 999 number for AML messages back to the UK AML destination for UK PSAP. 3
4.
© British Telecommunications
plc 2017 Routing of roaming information - schematic 4 Home Country Visited Country(UK) Home SMSC SMSC hosting Virtual Mobile Number SMS host SMSC SMS Aggregator Roaming handset makes emergency call MSC STP STP PSAP STP
5.
© British Telecommunications
plc 2017 Roaming way forward – test results from HELP 112 project SIMs from Ireland, Lithuania, Italy and Belgium, plus South Africa The messages came through very quickly, taking just a few seconds to arrive at our server. The normal high standard of GNSS and WiFi locations are obtained The individual test results show that using a long number for AML enables foreign roamer emergency calls to be matched with the caller’s location, whether the caller has brought their phone from within or outside of Europe It’s still possible to determine an accurate location if roaming data is switched off. The only case we didn’t receive a message was when the caller had no credit……….
6.
© British Telecommunications
plc 2017 Pilot for foreign roamers in UK Following successful testing under HELP 112 project, BT PSAP and UK MNOs have been running a pilot to enable Android ELS information for roamers. This uses the configuration change mentioned to a long virtual number +447786200XYZ About 5,000 calls processed so far:– - two mobile networks in the pilot - ELS configuration for UK roaming received for handsets active in home countries - Normal, very good locations via the long number as expected (many countries….) - Allowing Google to refine how dual SIM cases are managed [easier with later OS versions] - Very small numbers of messages from outside UK - declining as older phones updated - Some examples where data SMS message not received from a limited number of SMSCs Mobile networks monitoring to see if any billing queries: all UK networks aware of the long number concerned. No issues reported. 6
7.
© British Telecommunications
plc 2017 Managing any charges for AML locations Using a long SMS delivery number there is a charge to the caller for each message sent to that number. 1. Some messages won’t get through due to lack of credit 2. Most callers will not notice – don’t track individual SMSs on bills (and many are within allowances…….) 3. Some callers may complain about charges for SMS transporting AML: unlikely to object for help for real emergency 4. Some callers may object to their mistaken emergency calls (misdial, phone in pocket, etc) costing them money : still not very likely due to relatively low cost of texts…… An obvious solution is to make the AML endpoint a zero-rated number. The charge for sending SMS messages from abroad is composed of three portions: i) The retail cost charged by the network provider of the roaming subscriber ii) The wholesale SMS cost charged by provider of the long number to the network provider of the roaming subscriber iii) The wholesale roaming cost charged by the UK network on which the subscriber is roaming to the network provider of the roaming subscriber. It is straightforward to set up a long number hosted by a single UK network, but to avoid subscriber costs an agreement would be needed with each foreign network not to charge for the particular UK long number used. This is likely to be impractical with large numbers of mobile networks, but a pragmatic approach would be to agree this with networks for the most common countries that visit the UK, and would be especially useful in countries with large numbers of commuters from one country to another, or with very high proportions of tourists.7
8.
© British Telecommunications
plc 2017 Conclusions : Foreign roamers dialling emergency numbers in the UK A long SMS number configured in the existing Android ELS software is being used to deliver location for roamers to UK PSAP. Useful for callers and for mobile networks where roamers are not normally positioned in any other way (as in UK) This will normally cause a small charge to be raised between networks and requires callers to have credit In the short term (and for more occasional roamers) a small charge appears to be acceptable (no issues…..a few eurocents) Recommend that, particularly where there’s a large population of roamers, that mobile networks establish a zero rating for texts to long numbers used for most common roamers (eg commuters). BT Pilot has delivered benefits with no customer issues reported BT continuing to investigate/monitor examples where locations not received (solution not perfect for all handset/SMSC scenarios!) and expecting to rollout to other 2 UK networks Google is adapting/refining functionality through monitoring the pilot (eg Dual SIM cases) Recommend other PSAPs in other countries to now consider extending AML to roamers and contact Google when ready…….
9.
© British Telecommunications
plc 2017 Back-up slides if needed – use of AML in UK
10.
© British Telecommunications
plc 2017 UK Emergency Service BT Public Network Fixed/Mobile Networks BT 999 Call Centres Stage 1 PSAP BT (6 sites) ~ 30m calls/year Public networks (BT and others) Police 47% Ambulance 49% Fire 4% Coastguard <1% 999/112 (139 Local Controls – Stage 2 PSAPs) 999/112 call handling : Voice + Location - Voice : Mobile, Fixed, VoIP - eSMS for hearing impaired ( also ITUv21 text over voice, real time text using special terminals) - Telematics in certain vehicles that includes a voice call + separate SMS data message ~62% Mobile >100 Communication Providers (CPs) PSTN-IP Gateways VoIP CPs Location Hub – uses network and handset location Location VPNHandset locations via SMS – AML Network Location – GMLC for mobiles
11.
© British Telecommunications
plc 2017 Current UK results from AML On making an emergency call (999 or 112 in the UK), the handset tries to establish its location for 15-20 seconds while the emergency voice call is established, and the handset location is transmitted to the PSAP using SMS (either standard text or with Android ELS’s different Data Coding Scheme to standard texts) For 14 April 2018 the split over 25k AML location messages [all MNOs] 51% GNSS 37% WiFi 6% Cell 7% No Location 11 Reported Accuracy Percent No location 7% 0-9m 8% 10-19m 51% 20-49m 15% 50-99m 14% 100-999m 3% 999+m 1%
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