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Hlr04r2a

  1. 1. Features and Services in HLR 10 Chapter 4 This chapter is designed to provide the student with knowledge of services and features in HLR 10.OBJECTIVES: Upon completion of this chapter the student will be able to: • Handle Supplementary Services Implementation • Define conditional and unconditional call forwarding • Describe the different types of call barring • Handle Short Message services implementation • Describe Flexible Numbering • Describe the role of HLR in data calls
  2. 2. GSM HLR 10 Operation and Maintenance t io en na llly t In y Bl n a k –2– EN/LZT 123 3972 R2A
  3. 3. 4 Features and Services in HLR 10 4 Features and Services in HLR 10 Table of Contents Topic Page SUPPLEMENTARY SERVICES IMPLEMENTATION .........................73 SUPPLEMENTARY SERVICE SUBSCRIBER PROCEDURES...........75 REMOTE SUBSCRIBER PROCEDURE MECHANISM .......................79 CALL FORWARDING SERVICES.......................................................81 CALL FORWARDING UNCONDITIONAL (CFU) .................................82 CONDITIONAL CALL FORWARD........................................................83 DEFAULT CALL FORWARDING (DCF)...............................................84 MONITORING OF CALL FORWARDING REGISTRATION.................85 7-DIGIT DIALING .................................................................................86 CALL BARRING SERVICES ...............................................................90 OPERATOR DETERMINED BARRING ...............................................90 OPERATOR DETERMINED BARRING IN HLR FOR INTER-ZONAL CALLS ..................................................................................................92 OPERATOR DETERMINED BARRING IN HLR FOR CALL FORWARDED-TO NUMBER ...............................................................92 ERICSSON PROPRIETARY SERVICES.............................................94 SHORT MESSAGE SERVICES ...........................................................95 MOBILE TERMINATED SHORT MESSAGE SERVICE SUBSCRIPTION...................................................................................95 SHORT MESSAGE ROAMING ROUTING...........................................95 SET MESSAGE WAITING DATA .........................................................96 NOTE MS PRESENT ...........................................................................96 SHORT MESSAGE ALERT..................................................................97 HIGH PENETRATION NOTIFICATION................................................97 HLR SHORT MESSAGE SERVICE CENTER......................................97EN/LZT 123 3972 R2A – 71 –
  4. 4. GSM HLR 10 Operation and Maintenance FLEXIBLE NUMBERING .....................................................................99 DATA CALLS IN HLR........................................................................104 BEARER CAPABILITIES....................................................................104 BEARER CAPABILITY ADMINISTRATION .......................................104 MULTIPLE NUMBERING SCHEME...................................................106 SINGLE NUMBERING SCHEME .......................................................107 ISDN ORIGINATING DATA CALL......................................................109 HIGH SPEED CIRCUIT SWITCHED DATA (HSCSD) IN HLR...........110 – 72 – EN/LZT 123 3972 R2A
  5. 5. 4 Features and Services in HLR 10SUPPLEMENTARY SERVICES IMPLEMENTATION The command HGSSI is used to register and/or activate a supplementary service for a mobile subscriber. The registration and activation of the supplementary service applies to the Basic Service Group specified in the command, or to all applicable Basic Service Groups which have individual Basic services subscribed to, if the BSG is not given in the command. A supplementary service, e.g. Call Forwarding or Barring, could either be activated from the MS or by the operator. The command HGSSI handles the operator-controlled activation of a service. EXAMPLES : HGSSI:MSISDN=3415100004,SS=CFNRY, FNUM=15895800, OFA=1, TIME=15; Call Forwarding on No ReplY (CFNRY) is registered, with the number 15895800 as forwarded-to number 1, as origin for forwarded-to number analysis. The no reply condition timer is equal to 15 seconds. The subscription of MSISDN 3415100004 are all the basic service groups in the subscription. Parameter FNUM will only be accepted when the command is intended to register a call forwarding service. When parameter OFA is required, and has not been specified in the command, a value assigned as default to the mobile subscriber is used. HGSSI: MSISDN=3415100004, SS=CFB, BSG=TS10, FNUM=15895845, SADD=0-1A3C; Call Forwarding on MS Busy (CFB) is registered for the subscription of MSISDN 3415100004 with the number 15895845 as forwarded-to number; sub-address type NSAP and the sub-address 1A3C is for the ‘speech transmission’ basic service group. When registering a call forwarding service, if parameter SADD has been specified the forwarded-to subaddress is tied to the forwarded-to number.EN/LZT 123 3972 R2A – 73 –
  6. 6. GSM HLR 10 Operation and Maintenance HGSSI:MSISDN=3415100004, SS=BAIC; Barring of All Incoming Calls (BAIC) is activated for the subscription which MSISDN is 3415100004 are all the basic service groups in the subscription. HGSSE:MSISDN=3415100004, SS=CFB; Call Forwarding on MS Busy (CFB) is erased for the subscription MSISDN at 3415100004, which is all the basic services groups in the subscription. This means that the forwarded-to number is deleted. Depending on the supplementary service specified, some optional parameters are required and some are not. See Application Information for block HTRAN. These Supplementary Services are not used in the commands HGSSI and HGSSE: • AOC (Advice Of Charge) • CLIP (Calling Line Identification Presentation) • CLIR (Calling Line Identification Restriction) • COLP (COnnected Line identification Presentation) • COLR (COnnected Line identification Restriction) • CUG (Closed User Group) • HOLD (Call Hold) • ICI (Immediate Call Itemization) • MPTY (MultiParTY service) • OIN (Originating Intelligent Network) • TIN (Terminating Intelligent Network) • OICK (Originating Intelligent network Category Key) • TICK (Terminating Intelligent network Category Key) OPI: HLR Mobile Subscriber Supplementary Service Register OPI: HLR Mobile Subscriber Supplementary Service Erase OPI: HLR Mobile Subscriber Supplementary Service Activate OPI: HLR Mobile Subscriber Supplementary Service Deactivate – 74 – EN/LZT 123 3972 R2A
  7. 7. 4 Features and Services in HLR 10SUPPLEMENTARY SERVICE SUBSCRIBER PROCEDURES This function provides the mobile subscriber with the means to register, erase, activate, deactivate, and interrogate SS which have been provided to the subscriber. It also provides the subscriber with the possibility to register a new password. When a mobile subscriber wants to change a supplementary service, e.g. call forwarding unconditional, the subscriber must request a signaling channel and invoke a change in HLR. SS-Request Operator Supplementary Service Operator Supplementary Service Supplementary service ack Supplementary service ack SS-Confirm Figure 4-1 Invocation of a SS service procedure The MS sends an SS-request to the MSC which passes it onto the VLR. The VLR will then update itself and update the HLR. From the HLR an acknowledgment is sent to the VLR and VLR acknowledges to the MS.Supplementary Services Control The MS shall support the Man-Machine Interface (MMI) procedure specified as: Activation: *SC*SI# Deactivation: #SC*SI# Interrogation: *#SC*SI# Registration: *SC*SI# and **SC*SI# Erasure: ##SC*SI# This structure consists of the following parts: • Service Code, SC (2 or 3 digits) • Supplementary Information, SI (variable length)EN/LZT 123 3972 R2A – 75 –
  8. 8. GSM HLR 10 Operation and Maintenance The procedure always starts with *, #, ## or *# and is finished by #. Each part within the procedure is separated by *. The service code uniquely specifies the Supplementary Service, either as a defined GSM Supplementary Service or as a spare service code. All spare services codes shall be reserved for future use. The MS shall determine from the context whether an entry of a single *, activation or registration was intended. E.g. a call forwarding request with a single * would be interpreted as a registration, if containing a forwarded-to number or an activation if it does not contain a forwarded-to number. 5HJLVWUDWLRQ RI QHZ SDVVZRUG The following procedure permits the user to change the password relating to use of Supplementary Services. The password may not be erased or interrogated. The procedure is as follows: *03*ZZ*OLD_PASSW*NEW_PASSWORD*NEW_PASS# For Barring Services, ZZ= 330; 3UHVHQWDWLRQ RI ,0(, The following procedure shall instruct the ME to display its IMEI: *# 06 # – 76 – EN/LZT 123 3972 R2A
  9. 9. 4 Features and Services in HLR 10 2WKHU &RGHV IRU HILQHG 6XSSOHPHQWDU 6HUYLFHV 6XSSOHPHQWDU 6HUYLFH 6HUYLFH &RGH eMLPP 75 and 75n CD 66 CLIP 30 CLIR 31 COLP 76 COLR 77 CFU 21 CF Busy 67 CF No Reply 61 CF Not Reachable 62 all CF 002 all conditional CF 004 WAIT 43 UUS Service 1 361 UUS Service 2 362 UUS Service 3 363 all UUS Services 360 BAOC 33 BAOIC 331 BAOIC exc home 332 BAIC 35 BAIC roaming 351 all Barring Serv. 330 Outg.Barr.Serv. 333 Inc. Barring Serv. 353EN/LZT 123 3972 R2A – 77 –
  10. 10. GSM HLR 10 Operation and Maintenance EXAMPLE OF MOBILE INITIATED ACTIVATION OF CALL FORWARDING SERVICE Before the Call Forwarding activation is accepted, checks are made on the forward-to-number ensuring that it is in the international format and that the number is not restricted. If the number is not in an international format, then the activation should be converted in the CF analysis. 3 HLR MAP MSC/ 1 VLR 2 MS BSSAP BSC LAPD BTS Signaling path Traffic path Figure 4-2 Activation of Call Forwarding from MS 1. The subscriber wishes to activate unconditional call forwarding. This can be done from the menu or by dialing . 2. The MS will generate the message and send it to the HLR where its subscription is held. 3. The HLR will check the C-number in an analysis table. Note that the C-number sent, is in an unknown format. Before the C-number can be stored, and the MS informed, the number must be converted into the international format, by removing the 0 and inserting the country code. – 78 – EN/LZT 123 3972 R2A
  11. 11. 4 Features and Services in HLR 10 The three conditional call forward services have the following codes: call forward when not reachable call forward on no reply call forward on busyREMOTE SUBSCRIBER PROCEDURE MECHANISM This feature enables the HLR to receive the standard supplementary services (SS) operations (e.g. invoke a call forwarding) from an external node, and not only from the VLR or by command. The implementation is entirely in the HLR; however, an external node is needed in order to take advantage of the feature and provide a service to the end-user. By introducing a mechanism which correctly handles external SS operations addressed via MSISDN (since the subscriber’s IMSI may not be available in the external node), a subscription may be updated regardless of whether an MS is reachable or not reachable. The external node must use the MAP interface to take access to the HLR. The following MAP V2 messages are accepted from the external node: • ActivateSS • DeactivateSS • RegisterSS • EraseSS • InterrogateSS • RegisterPassword • Process UnstructuredSS-RequestEN/LZT 123 3972 R2A – 79 –
  12. 12. GSM HLR 10 Operation and Maintenance HLR Register MAP V2 Fwd-to number PSTN/ DTMF external ISDN Node Internet WWW Register browser Fwd-to number Figure 4-3 Remote Subscriber Procedure – 80 – EN/LZT 123 3972 R2A
  13. 13. 4 Features and Services in HLR 10CALL FORWARDING SERVICES Call Forwarding allows the Mobile Subscriber to have their incoming calls forwarded to another directory number. The calls can be forwarded in the following situations: • Call Forwarding on MS Not ReaChable (CFNRC) • Call Forwarding on MS Busy (CFB) • Call Forwarding on No ReplY (CFNRY) • Call Forwarding Unconditional (CFU) The HLR orders the GMSC to reroute a terminating call when the mobile subscriber is not reachable or when unconditional call forwarding is active. If inactive, the call is handled as a normal terminating call in the HLR. In addition, the calling subscriber may be given notification depending on subscription options of the forwarding subscriber. The notification can be a recorded announcement, depending on the exchange parameters. The recorded announcement can also be in different languages and/or can be different depending on the reason for forwarding. Registration, erasure, activation, and deactivation are performed by the service provider or by the subscriber. The roaming interrogation is used in the GMSC to interrogate the HLR for routing information. The called MSISDN number is sent to the HLR when requesting routing information. A forwarded-to number is the result of the interrogation to the HLR. The forwarded-to number is then used to set up the call. The call can be forwarded in the following situations: • Initiated from GMSC: - Call forwarding unconditional - Call forwarding on MS not reachable • Initiated from MSC/VLR - Call forwarding on MS busy - Call forwarding on no reply - Call forwarding on MS not reachable The HLR also sends forwarding options to the GMSC. The forwarding options provide the reason for forwarding the callEN/LZT 123 3972 R2A – 81 –
  14. 14. GSM HLR 10 Operation and Maintenance and indicates if a notification should be sent to the calling subscriber. There are also three Exchange Properties related to Call Forwarding services. They are: Exchange Properties: CFMAXNUMFORWARD Maximum number of forwarding allowed. CFNRCVALIDCOND No reachable subscriber condition. Defines if the location is unknown, barred, restricted or purged and are valid conditions for forwarding the call according to the service call forwarding on the mobile not reachable. CFNRTIME Defines the time interval from the point when the subscriber is first alerted until the call is redirected. Involved blocks: HSSD, HBSGD.CALL FORWARDING UNCONDITIONAL (CFU) The unconditional forwarding allows the service provider or the MS, who holds a subscription in the HLR, to forward all incoming calls unconditionally to another directory number. – 82 – EN/LZT 123 3972 R2A
  15. 15. 4 Features and Services in HLR 10 HLR PSTN %6XEVFU GMSC/ VLR MS $6XEVFU BSC BTS 6XEVFU Signaling path Figure 4-4 Unconditional Call Forwarding When the HLR checked the MS’s subscription, the supplementary service CFU was found to be active. The HLR then returns the C-number to the GMSC instead of an MSRN. The subscriber can register one Forwarded-to number for each Basic Service Group with any Basic Service subscribed.CONDITIONAL CALL FORWARDCall Forwarding on MS Busy (CFB) This function forwards the calls for an MS, who holds a subscription in the HLR, to another directory number if the called subscriber number is busy.Call Forwarding on MS Not Reachable (CFNRC) This function forwards incoming calls to another directory number if contact with the MS cannot be established.EN/LZT 123 3972 R2A – 83 –
  16. 16. GSM HLR 10 Operation and MaintenanceCall Forwarding on No Reply (CFNRY) This function forwards incoming calls to another directory number if the called subscriber does not answer a call within a predefined time period. HLR PSTN %6XEVFU GMSC/ VLR MS $6XEVFU BSC BTS 6XEVFU Signaling path Traffic path Figure 4-5 Conditional Call Forwarding The HLR will carry out subscription checks for the MS, then ask the VLR for an MSRN. The MSRN will be returned to the GMSC and then routed to the correct MSC/VLR. When the user does not answer the phone, the MSC/VLR will then, with the help of function block MRR, route the call to a C-number.DEFAULT CALL FORWARDING (DCF) The purpose of this feature is to simplify the call forwarding mechanism to, e.g., the voice mail system. This allows the operator to register a default forwarded-to number. The purpose is so the caller does not need to set the forwarded-to number to his/her voice mail. The MSC/VLR views this feature as a normal call forwarding service. – 84 – EN/LZT 123 3972 R2A
  17. 17. 4 Features and Services in HLR 10 Different subscription options can be created: • Calling subscriber can receive notification that the call has been forwarded. • The DCF service can be provided as a default of the call forwarding on busy and/or on no reply and/or on not reachable. The call forwarding service takes precedence over the DCF and it interacts with other SS’s which is the same as the other call forwarding services. DCF takes precedence over the Single Personal Number feature which means that a subscriber shall not be provided with both Single Personal Number and DCF. The DCF is provided per Basic Service Group (except SMS) meaning that this feature also can be used with different forwarded-to numbers, e.g., terminating speech and fax calls.MONITORING OF CALL FORWARDING REGISTRATION This feature provides the operator with a mechanism to count the number of call forwarding, in a certain time interval (given by command), for a specified subscriber. When the counter reaches specified value (also given by command), an alarm is generated to inform the operator that a certain subscriber may be a fraudulent one since he/she is frequently changing the call forwarding number. After each successful call forwarding initiated by the monitored subscriber, the monitoring counter is stepped. Whenever the counter reaches the defined threshold, an alarm is generated and the MSISDN number, date and time of the occurrence are recorded in a log file. When an alarm is generated, the counter for this subscriber is cleared and the monitoring continues. The monitoring counter, tied to each monitored subscriber, is cleared for all subscribers when the supervision time expires and the monitoring continues for the next supervision time interval. The alarm can be reset by command and the log file can be printed by command. This function can be activated per subscriber, per series of MSISDNs or for all subscribers. It is possible to monitor all forwarded-to number registrations, or only international forwarded-to number registrations, with the parameter MCF.EN/LZT 123 3972 R2A – 85 –
  18. 18. GSM HLR 10 Operation and Maintenance OPERATIONAL INFORMATION: OPI: “HLR, Monitoring Call Forwarding Registration Activate.” OPI: “HLR, Monitoring Call Forwarding Registration Deactivate.” OPI: “HLR, Monitoring Call Forwarding Registration Logging Data, Delete.” OPI: “HLR, Monitoring Call Forwarding Registration Supervision.” Exchange properties: MCFTIMESUP Time period for time supervision MCFTHRESHOLD Threshold for the number of successful forwarded-to number registrations MCFALARM Indication whether the alarm is to be generated or not HGMRI, HGMRE, HGMRP for activation, deactivation and printing of the monitoring of call forwarding registration data. HGMRI: MSISDNS=34152..., MCF=1/2; You can specify a single MSISDN or series, and monitor international calls or all calls. HGMSR for alarm reset. HGMLP, HGMLR for printout and clearing the logging data file. Involved blocks: HMCFD, HMCFDA7-DIGIT DIALING This feature is intended for CMS 40. It is used if 7 digit functionality exists. Subscribers in the US are familiar with dialing 7 digits to call subscribers within their own Numbering Plan Area (NPA). Similarly, this feature enables the use of 7 digit dialing for originating call set-up and call forwarding SS in the GSM network. The subscriber does not have to dial their NPA when calling within their own NPA from the home PLMN. – 86 – EN/LZT 123 3972 R2A
  19. 19. 4 Features and Services in HLR 10 The HLR performs the following checks before inserting ‘1+NPA’ in front of the number: • The subscribers own NPA is not 500. If the NPA is 500, the operation will be rejected with an SS incompatibility error. • The 7 digit number has the NXX-XXXX format, where N is a digit from 2 to 9 and X is a digit from 0 to 9. If the format is not NXX-XXXX, the operation will be rejected with an Unexpected Data Value error. • In the case when the subscriber has the “Dual Numbering” service and the NPAs of the “Main” MSISDN and the “Dual” MSISDN are different, the parameter Basic Service is received in the Register SS message. If the parameter is not received, the operation will be rejected with a Data Missing error. • In the case when the subscriber has the “Dual Numbering” service and the NPAs of the “Main” MSISDN and the “Dual” MSISDN are different, the parameter Basic Service does not indicate Teleservice “allTeleservices.” If the Teleservices are equal to “allTeleservices,” the operation will be rejected with SS incompatibility error. After performing the checks and not finding any errors, the HLR inserts the ‘1+NPA’ in front of the number. • In the case where the subscriber does not have the “Dual Numbering” service, 1+NPA digits are inserted in front of the forwarded-to number. This is when the NPA is the NPA of the subscriber who requested the registration. • In the case where the originating subscriber has the “Dual Numbering” and the Teleservice indicates “Auxiliary Speech”, then the 1+NPA digits of the “Alternate” or “Dual” MSISDN are inserted in front of the forwarded-to number. • In the case when the originating subscriber has the “Dual Numbering” and the Teleservice does not indicates “Auxiliary Speech,” then the 1+NPA digits of the “Main” MSISDN are inserted in front of the forwarded-to number. • In the case when the subscriber has the “Dual Numbering” and the NPAs of the “Main” MSISDN and the “Dual” MSISDN are the same, then the common NPA will be inserted if the parameter Basic Service is not received in the Register SS message. • In the case when the subscriber has the “Dual Numbering” and the NPAs of the “Main” MSISDN and the “Dual” MSISDN are the same, then the common NPA will beEN/LZT 123 3972 R2A – 87 –
  20. 20. GSM HLR 10 Operation and Maintenance inserted if the parameter Basic Service received in the Register SS message indicates the Teleservice is equal to “allTeleservices.”7 Digit Forwarded-to Number Registration This allows the mobile subscriber in the GSM network to register a 7 digit forwarded-to number in the HLR. An MS may always register a 7-digit forwarded-to number using Register SS MAP V.1 or V.2. When this is received, the HLR will check if the address is unknown and if the digit structure is NXX-XXXX where N=2-9, X=0-9. If the structure is not correct, then the error “Unexpected Data Value” is returned. Before checking that the number received is not the subscriber’s own MSISDN or an additional number associated with the subscriber, the following checks are performed: 1. If Basic Service Group (BSG) parameter is not received, the following checks are completed: – If the subscriber does not have “Dual Number” service, it is checked that the NPA of subscriber’s Main MSISDN is not 500. If it is 500, the error “SS Incompatibility” is returned. – If the subscriber has “Dual Number” service and the NPAs of the “Main” MSISDN and the “Dual” MSISDN are equal, it is checked that it is not 500. If it is 500, the error “SS Incompatibility” is returned. – If the subscriber has “Dual Number” service and the NPAs of the “Main” MSISDN and the “Dual” MSISDN are different, the error “Data Missing” is returned. 2. If BSG parameter is received and it indicates that Teleservice is equal to “allTeleservices” or to “allTeleservices except Short message,” the following checks are completed: – If the subscriber does not have “Dual Number” service, it is checked that the NPA of the subscriber’s Main MSISDN is not 500. If it is 500, the error “SS Incompatibility” is returned. – If the subscriber has “Dual Number” service and NPAs of the “Main” MSISDN and the “Dual” MSISDN are equal, it is checked that it is not 500. If it is 500, the error “SS Incompatibility” is returned. – If the subscriber has “Dual Number” service and NPAs of the “Main” MSISDN and the “Dual” MSISDN are – 88 – EN/LZT 123 3972 R2A
  21. 21. 4 Features and Services in HLR 10 different, the error “SS Incompatibility” is returned. 3. If BSG parameter is received and it indicates that Teleservice is equal to “Auxiliary Telephony” or to “Auxiliary Speech”, it is checked that the NPA of the “Dual” MSISDN is not 500. 4. If BSG parameter is received and it is different to “allTeleservices.” AllTeleservices, except Short Message “Auxiliary Telephony” or “Auxiliary Speech”, it is checked that the NPA of the “Main” MSISDN is not 500. If it is 500, the error “SS Incompatibility” is returned. If all the checks performed in the previous chapters are passed and no errors were found, HLR inserts 1+NPA in front of the forwarded-to number. The inserted NPA digits are: • The same as the subscriber’s “Main” MSISDN if he/she does not have “Dual Number” service. • If the subscriber has “Dual Number” service and the NPAs of the “Main” MSISDN and the “Dual” MSISDN are equal, the common NPA will be inserted. If the subscriber has “Dual Number” service and the NPAs of the “Main” MSISDN and the “Dual” MSISDN are different, the NPA digits of the “Dual” MSISDN will be inserted if the parameter Basic Service indicates that Teleservice is equal to “Auxiliary Telephony” or to “Auxiliary Speech”. Otherwise, the NPA digits of the “Main” MSISDN will be inserted.EN/LZT 123 3972 R2A – 89 –
  22. 22. GSM HLR 10 Operation and MaintenanceCALL BARRING SERVICES The purpose of this feature is to bar calls. Calls can be barred in the following situations: • Call Barring of All Incoming Calls (BAIC) • Call Barring of All Outgoing Calls (BAOC) • Call Barring of Outgoing International Calls (BOIC) • Call Barring of Outgoing International calls EXcept those directed to the Home PLMN country (BOIEXH) • Call Barring of Incoming Calls when Roaming Outside the home PLMN country (BICRO) Call barring services enables the mobile subscriber to prevent the use of their subscription for specified types of calls. However, set-up emergency calls remains unaffected. The HLR performs call barring services when indicated by the subscription (parameter SUD). This means that the relevant barring data constitutes part of the mobile subscribers data in the HLR. The subscriber can select two subscription options regarding the control of barring services. Either the service is controlled by the services provider only, or by the service provider and the mobile subscriber using a password. Involved blocks: HSSD.OPERATOR DETERMINED BARRING The Operator Determined Barring refers to the administrative means used by the operator in order to bar the Mobile Stations (MS) from outgoing and/or incoming calls for administrative reasons. • A short message is handled as a call • This feature lets the operator bar the MS to access any GSM services when roaming into a certain area • Only the operator may activate and deactivate the features The following Operator Determined Barrings are available in HLR: – 90 – EN/LZT 123 3972 R2A
  23. 23. 4 Features and Services in HLR 10 • Barring of All incoming and outgoing calls (OBA) • Barring of all Incoming calls (OBI) • Barring of all Outgoing calls (OBO) • Barring of Outgoing Premium Rate calls, Entertainment (OBOPRE) • Barring of Outgoing Premium Rate calls, Information (OBOPRI) • Barring of Registration of Forwarded-to number (OBRF) • Barring of Supplementary Services Management (OBSSM) • Barring of Incoming Inter-Zonal calls (OBZI) • Barring of Outcoming Inter-Zonal calls (OBZO) • When registered in the HPLMN Operator Specific Barring, type 1 (OSB1) • When registered in the HPLMN Operator Specific Barring, type 2 (OSB2) • When registered in the HPLMN Operator Specific Barring, type 3 (OSB3) • When registered in the HPLMN Operator Specific Barring, type 4 (OSB4) • Barring of Roaming (OBR) The subscriber record in HLR contains information which points out which barring programs are active for the subscriber. This information may be set by the operator. The subscriber data is inserted into MSC/VLR by HLR. MSC/VLR will bar outgoing calls according to access barring analysis: E.g., international calls except those directed to the HPLMN country. If an incoming call arrives for the subscriber and the subscriber has incoming calls barred, the HLR will not forward routing information to MSC/VLR. The answer to the roaming routing interrogation will indicate that the call was barred. If the call is a mobile originated short message, the service center number is analyzed so it is able to point out the destination instead of the called subscriber number. An extended analysis should be defined if the feature, which is optional and controlled by exchange property , will be used. There are some Exchange Properties in the Applicaton Information of block HRS and its relation.EN/LZT 123 3972 R2A – 91 –
  24. 24. GSM HLR 10 Operation and MaintenanceOPERATOR DETERMINED BARRING IN HLR FOR INTER-ZONALCALLS Operator Determined Barring of inter-zonal calls gives the operator the ability to restrict calls within a world zone (e.g. world zone one with USA, Canada, Puerto Rico, Jamaica, etc.). Only the operator may activate and deactivate the feature. The following barring options are available with this feature: • Barring of incoming calls when roaming outside the zone of the HPLMN country • Barring of outgoing inter-zonal calls • Barring of outgoing inter-zonal calls except those directed to the HPLMN country • Barring of outgoing international calls except those directed to the HPLMN country AND barring of outgoing inter-zonal calls Only one of the barring services, from the last three options, can be activated at the same time. The subscriber record in HLR contains information which points out which barring options are active for the subscriber. This information may be set by the operator. An extended analysis should be defined if the feature, which is controlled by the optionally parameter in APZ, is to be used. A “zone” is defined by the digit allocated as the country code or as the first digit of the country code. Valid values are from 1 to 9. Zones 3 and 4 are treated as one.OPERATOR DETERMINED BARRING IN HLR FOR CALLFORWARDED-TO NUMBERS Operator Determined Barring for call forwarded-to numbers provides the operator with a new set of barring options to control subscribers use of the call forwarding feature. The following Operator Determined Barring options are available with this feature: • Barring of registration of any call forwarded-to number • Barring of any international call forwarded-to number – 92 – EN/LZT 123 3972 R2A
  25. 25. 4 Features and Services in HLR 10 • Barring of registration of any international call forwarded-to number except to a number within the HPLMN country • Barring of registration of inter-zonal call forwarded-to number • Barring of registration of inter-zonal call forwarded-to number except to a number within the HPLMN country Only one of these barring options can be activated at the same time and only the operator may activate and deactivate them. The subscriber record in HLR contains information which points out which barring options are active for the subscriber. This information may be set by the operator. An extended analysis should be defined if the feature, which is optional and controlled by the APZ optionally parameter, is going to be used. Involved blocks: HSDH, HSDH2, HDSH3.EN/LZT 123 3972 R2A – 93 –
  26. 26. GSM HLR 10 Operation and MaintenanceERICSSON PROPRIETARY SERVICES Ericsson Proprietary Supplementary Services are PLMN specific Supplementary Services (SS), defined by Ericsson, but not included in the GSM specification. A PLMN specific SS is a service that only has meaning in a PLMN. In the HLR it is possible to define (by commands) the PLMN specific Supplementary Service (PSS) codes and PRIvate Tag (PRIT) values that are valid for a specific MSC/VLR area. The administration of these features will be carried out by the existing commands for change and a printout of the subscriber data and profile administration. Then, these features will not require any of their own commands. The Ericsson Proprietary Services that can be assigned to a subscriber are: • Single Personal Number (SPN) • Immediate Call Itemization (ICI) • Originating Intelligent Network (OIN) • Terminating Intelligent Network (TIN) • Dual Number (DN) • Originating IN Category Key (OICK) • Terminating IN Category Key (TICK) • Channel Allocation Priority Level (CAPL) • Subscription TYPE (STYPE/ST) • ACcount Codes (ACC) This information will be stored in block HSD as a new Permanent Subscriber Data. – 94 – EN/LZT 123 3972 R2A
  27. 27. 4 Features and Services in HLR 10SHORT MESSAGE SERVICES When a subscriber subscribes to a mobile terminated or mobile originated Short Message Service (SMS) then the subscriber will be able to receive short messages. When a Short Message is being received by a mobile subscriber, the HLR checks if the service is provisioned, if any barring is active, and if the subscriber is absent. In case of an unsuccessful delivery of a short message, the Service “Messages-Waiting” provides the HLR with the information that there is a message in the Short Message Service-Center (SMS-C) waiting. The information is located in the HLR Messages-Waiting-Data (MWD), which contains a list of SMS-C addresses that have made unsuccessful delivery attempts. The HLR informs the SMS-C when the mobile is available.MOBILE TERMINATED SHORT MESSAGE SERVICE SUBSCRIPTION This function provides the administrative means to allow an MS to receive short messages.SHORT MESSAGE ROAMING ROUTING This function provides SMS-GMSC routing information to forward mobile terminated short messages. When the HLR receives the interrogation to locate the subscriber from the GMSC, instead of sending a roaming number back to the GMSC (no speech channel is needed), the HLR sends back the VLR address to the GMSC.EN/LZT 123 3972 R2A – 95 –
  28. 28. GSM HLR 10 Operation and Maintenance (2) (1) (3) (6) (4) 1. Forward mobile terminated Short Message (5) 2. Send routing information for Short Message 3. Forward information 4. Forward Short Message 5. Result Message 6. Result Message Figure 4-6 Mobile Terminating SMSSET MESSAGE WAITING DATA If the transmission of a Short Message (SM) is not successful, the VLR sends a “not successful” message back to the HLR. A flag is set in the HLR and it requests the inclusion of the Service Center address, in the Message Waiting Data. The Service Center is also informed and the SM is stored. Figure 4-7 Unsuccessful Message Transfer As soon as the Mobile Subscriber is available again, the HLR will be informed.NOTE MS PRESENT This function informs the HLR when the MS is reachable again. The HLR has stored the SC-address (message waiting list) and sends the “alert” to the Inter-Working MSC (IWMSC). – 96 – EN/LZT 123 3972 R2A
  29. 29. 4 Features and Services in HLR 10SHORT MESSAGE ALERT The corresponding Service Center is alerted when the MS is able to receive Short Messages, after performing an unsuccessful short message transfer. Alert Service Center Figure 4-8 Note MS Present (Ready for SM in MAP V2)HIGH PENETRATION NOTIFICATION High Penetration Notification will allow the subscriber to receive a notification when a Mobile Terminated Short Message has failed due to no paging response. The feature makes the subscriber reachable everywhere, which might be a big issue when choosing a satellite telephony service. By using this service, the satellite operator drastically increases its coverage to all indoor area environments which the signal normally reach. This service will deliver very short messages utilizing the high power capacity in the satellites. Subscription to the High Penetration Notification service is handled by the HLR and the SUD=HPN. Then the High Penetration Notification subscriber data is provided to the MSC/VLR. MAP V3 is required for this feature.HLR SHORT MESSAGE SERVICE CENTER There is no command needed in the HLR to specify Service Center addresses because they are inserted automatically, when the subscriber is not reachable. However, there is an OPI for associated printouts.EN/LZT 123 3972 R2A – 97 –
  30. 30. GSM HLR 10 Operation and Maintenance OPERATIONAL INFORMATION OPI: “HLR Service Center Address Data Printouts” HGSCP; Prints out all stored Service Center addresses and the number of associated subscribers. HGMWP:MSISDN=3415100001; Prints the Service Center addresses when messages for the subscriber are waiting within the given MSISDN. – 98 – EN/LZT 123 3972 R2A
  31. 31. 4 Features and Services in HLR 10FLEXIBLE NUMBERING The purpose of the Flexible NumbeRing (FNR) feature is to enable mobile operators to allocate subscriber identities in a flexible way. This is to avoid today’s restrictions on the subscribers ability to choose an MSISDN which is restricted to the MSISDN number series assigned to the HLR. This is where the corresponding IMSI number series is held once the subscriber obtains the SIM card. In the GSM mobile systems, a node may have the need to communicate with the HLR regarding a mobile station subscriber of which the HLR address is unknown. The node uses either the IMSI or the MSISDN to address the HLR, depending upon the traffic case and on which identity is available. When a mobile terminating call enters the GSM network, the GMSC needs to interrogate the HLR in order to find out where the mobile station is located. The called subscriber MSISDN, is used in the SCCP analysis to route the interrogation message to the HLR where the subscription is held. To make the SCCP analysis reasonable, MSISDN numbers belonging to certain HLRs are grouped together. In other words, consecutive IMSI and MSISDN numbers (in a series) cannot belong to different HLRs. This is not a problem in a single HLR environment. However, in a multiple HLR environment it is necessary that the Subscriber Identity Module (SIM) cards (containing the IMSI) must be pre- packaged in groups together with the MSISDN number series used in that particular HLR. The purpose of this feature is to add flexibility in the system to make it possible for the service provider to allocate any MSISDN number to an IMSI. If this function is introduced in an existing network, the SCCP analysis in the concerned nodes (GMSCs and STPs) must be modified to route the interrogation message “Routing Information Request” to the FNR instead of routing it directly to the HLR. It must be assured that the messages arrive at the FNR with the MSISDN in the Global Title field of the “Called Party Address” parameter.EN/LZT 123 3972 R2A – 99 –
  32. 32. GSM HLR 10 Operation and MaintenanceTechnical Solution The technical solution implies the creation of an application that can be seen as an extension to SCCP. The GMSC sends the interrogation message to the FNR. The message is routed on the called subscribers MSISDN, using the SCCP analysis. The FNR searches for the MSISDN number in the FNR data base, which contains the connection between the subscribers MSISDN, IMSI and MGT. If the MSISDN is found, the corresponding MGT is collected, so the interrogation message can be routed to the correct HLR. It may be routed to the HLR node where the real subscription (IMSI plus the rest of subscriber data) is kept. E.164 E.214 GMSC FNR HLR MSISDN MGT Figure 4-9 FNR function The FNR functionality can be implemented in the mobile network with different physical locations and configurations. This is due to the Application Modularity concept, which was established in APT 210 15. One possible configuration is the FNR integrated with a HLR or a GMSC as shown in figure 4-6. GMSC FNR HLR SCCP SCCP # 7 network Figure 4-10 FNR/HLR Another possible configuration is the FNR is implemented as a stand-alone. In order to route the interrogation message to the correct HLR, the FNR needs a data base containing the connection between the MSISDN, IMSI and MGT. This connection is defined by the command HGFNI: HGFNI: MSISDN= 3415100001, IMSI= 24450100001; – 100 – EN/LZT 123 3972 R2A
  33. 33. 4 Features and Services in HLR 10 The MGT is obtained at connection of the MSISDN-IMSI which is done by accessing a translation table in block FLNAN, containing the translation data. When the HGFNI command is entered, the leading digits of the IMSI number are analyzed. If they are found in the translation table, the IMSI is modified to a MGT and the three different number types, MSISDN, IMSI and MGT, are stored in the FNR data base. IMSI MGT 240 01 1000000002 46 707 5000000002 240 01 1 46 707 5 HLR 1 240 01 2 46 707 6 HLR 2 240 01 3 46 707 7 HLR 3 Figure 4-11 FNR Translation Table This relation must be defined for all MSISDN numbers that are routed through the FNR. If a MSISDN is not found (not defined) in the data base, then the message will be routed to a default HLR using a default IMSI which is defined by the command HGFNC: HGFNC: IMSI= 2445010; There is also a possibility for fast reading of the MSISDN-IMSI pairs from an external file and definition of them in the Flexible Numbering data base. For this purpose the file FLNUMFILE is used. It is a copy of the file HPSDFOAFILE obtained from the File Output for subscriber data in the HLR and must be defined.EN/LZT 123 3972 R2A – 101 –
  34. 34. GSM HLR 10 Operation and Maintenance HLR commands HGPFI:IMSIS=ALL; HLR 1. HPSDFOAFILE AXE I/O commands COPY: INFIT 2. INFET (INFII) FNR commands (AI:HPSDFOA) FLNUMFILE FNR HGFII; 3. Figure 4-12 Loading the FNR with information about MSISDN- IMSI pairs already existing in the HLR Call to a Mobile Subscriber (MS) is the only traffic case affected by the introduction of FNR node in a mobile network. When adding the Flexible Numbering functionality in the network, the interrogation messages are no longer to be routed towards a specific HLR. Instead, they are routed via the FNR. This will bring some changes in the SCCP data in the GMSC and HLR nodes. HLR1 HLR2 HLR3 GMSC Figure 4-13 Network without FNR All MSISDN numbers analyzed in the GMSC will get a Global Title Routing Case (GTRC) pointing towards the FNR. The destination SubSystem Number (SSN) included in the message, – 102 – EN/LZT 123 3972 R2A
  35. 35. 4 Features and Services in HLR 10 must be changed to address the FNR (default SSN=253) instead the default value of HLR (SSN=6). HLR1 HLR2 HLR3 3 2 FNR 1 GMSC Figure 4-14 Network with FNREN/LZT 123 3972 R2A – 103 –
  36. 36. GSM HLR 10 Operation and MaintenanceDATA CALLS IN HLRBEARER CAPABILITIES Within Integrated Services Digital Network (ISDN), Public Switched Telephone Network (PSTN) and Global System for Mobile communication (GSM), a number of different services are available. These services include speech, facsimile, and data transmission with different user rates. The receiving node, as well as intermediate nodes, need information on what service is requested and how the service is to be performed, e.g., what user rate is used. Bearer capabilities (BC) contain this information. BCs are part of the User Service Information Element in the CALL OUT IAM message, and the Bearer Capability Information Element (BCIE) in the SETUP message. 1RWH This only applies to ISDN and GSM since PSTN FDQQRW provide this type of information. Different coding schemes are used in ISDN and GSM because different transmission requirements must be met. They are referred to as ISDN BC and GSM BC. For every call set up from ISDN or GSM, the BC information describes the type of service requested. However, this is not possible in a situation when a call is received from the PSTN, so additional MSISDN numbers are used instead.BEARER CAPABILITY ADMINISTRATION During Roaming Routing Determination, a bearer capability analysis is performed in function block HBCAN (Home Bearer Capability Analysis). A different coding scheme for the BC is used and is needed as in GSM and in the ISDN. The reason is that in ISDN a wider range of services can be provided. The analysis is performed in several steps: 1. Translation from ISDN-BC into GSM-BC. 2. Translation from GSM-BC into the GSM defined Basic Service Group (BSG) will be used for checking which supplementary services are applicable for the wanted BSG. – 104 – EN/LZT 123 3972 R2A
  37. 37. 4 Features and Services in HLR 10 3. Finally, an internally BC number is derived for checking if the service is supported by the HLR. In the following the applicable supplementary services will be checked if they are subscribed, and if so, if they are activated. All GSM BCs supported by the HLR must be defined by command in the HLR. OPERATIONAL INFORMATION OPI:HLR Mobile Subscriber GSM Bearer Capability Define OPI:HLR Mobile Subscriber GSM Bearer Capability Delete HGBDI:BC=15, FAX, RC=5-0-3, ACC=0-3-0, ITN=0; Bearer capability number 15, representing the Teleservice Facsimile Group 3, is assigned to the following values: • RC (Radio Channel) consists of parameters UR-MT-IR UR (User rate) is 9.6 Kbit/s MT (Modem Type) is none IR (Intermediate Rate) is 16 Kbit/s • ACC (Information Access) consists of RA-S-SA RA (Rate Adaptation) is no rate adaptation S (Structure) is unstructured SA (Synchronous/Asynchronous) is synchronous Interworking with Terminating Network (ITN) may consist of two parameters, Connection Element (CE) in this case indicates transparent. New parameter and units for this command must be included when defining the High Speed Circuit Switched Data Service which will be explained later in this chapter. HGBDI:BC=19, ALTFAX, RC=5-0-3, ACC=030, ITN=0; Bearer capability 19 is coded for alternate speech/facsimile group 3. Starting with speech: user rate to 9.6 Kbit/s, modem type to none, intermediate rate to 16 Kbit/s, no rate adaptation, structure to unstructured, synchronous, connection element to transparent, representing the teleservice alternate speech and facsimile group 3.EN/LZT 123 3972 R2A – 105 –
  38. 38. GSM HLR 10 Operation and Maintenance The BC numbers can be freely assigned by the operator except for four reserved values: • BC=0 represents teleservice “Telephony” • BC=1 represents teleservice “Auxiliary Speech” • BC=8 represents the basic service “Altern. Speech and Autom. Facsimile Group 3” • BC=9 represents the basic service ” “Autom. Facsimile Group 3” HGBDE:BC=15; Bearer capability 15 is not defined further.MULTIPLE NUMBERING SCHEME The Multiple Numbering Scheme allows the Home Public Land Mobile Network (HPLMN) to allocate several MSISDNs to one subscriber. Each MSISDN is associated with one BC. When a call comes from the PSTN, the HLR determines which BC is required, by using an additional MSISDN assigned to the subscriber. A subscriber must have an additional MSISDN number for each type of service, and the correct MSISDN must be dialed for each type of call. One subscriber can have a maximum of 16 different additional numbers (ADDMAXNUM). E.g.: A subscriber would need one number for telephony service, a second for asynchronous data service 2400 kbit/sec, and a third for automatic fax group 3. The additional numbers are tied to a specific service in the HLR. This service is described by means of a GSM BC. Figure 4-15 is an overview of how the service is retrieved from an incoming MSISDN in HLR. The missing BC is generated in the HLR. – 106 – EN/LZT 123 3972 R2A
  39. 39. 4 Features and Services in HLR 10 HSNAN not relevantMSISDN Main ADD HASND Additional ADD. No. BC BC HBCAN BC service BCIE SER. Figure 4-15 MSISDN AnalysisCalls Using Additional MSISDN Terminating calls using additional MSISDNs without ISDN-BC codes are handled according to the BS code obtained from the GSM-BC linked to that number. This linked BC code is then sent to the VLR.SINGLE NUMBERING SCHEME The single numbering scheme is introduced with Ericsson’s GSM System. This scheme allows the HPLMN to allocate one MSISDN to a subscriber, which is applicable to all services. In this scheme, the subscriber’s main MSISDN is also defined as an additional MSISDN. This provides the ability to link a BC to the main MSISDN and allows terminating calls to act as calls using an additional MSISDN.Calls Using Main MSISDN and no ISDN-BC Available When the main MSISDN is used, but no ISDN-BC is available, the “Default Basic Service Group” linked to the subscriber handles the call. A GSM-BC is not sent to the VLR because a specific BC cannot be associated to the main MSISDN. In this case, the mobile station will return a complete GSM-BC in the Call Confirmed message indicating the service required by the mobile subscriber. Some mobile stations do not return the GSM-BC in the Call Confirmed message to the VLR. It is necessary to have an additional MSISDN to ensure that the VLR receives a BC fromEN/LZT 123 3972 R2A – 107 –
  40. 40. GSM HLR 10 Operation and Maintenance the HLR for subscribers with only one BS different from telephony. This modification allows the main MSISDN to be defined as its own additional MSISDN. Calls received without a BC can be handled using additional MSISDN.Command HGAMI Command HGAMI initiates the subscription of MSISDN as an additional MSISDN linked to a specific GSM-BC for a subscriber. Both MSISDN and AMSISDN will have the ability to contain the same number. OPERATIONAL INFORMATION OPI: HLR Mobile Subscriber Additional MSISDN Initiate OPI: HLR Mobile Subscriber Additional MSISDN End HGAMI: MSISDN=3415100001, AMSISDN=3415100010, BC=15; The number 3415100010 is the additional number for the BC number 15 and for the subscription whose main MSISDN is 3415100001. HGAME:AMSISDN=3415100010; The number 3415100010 is not an additional number anymore. Involved blocks: HASND. – 108 – EN/LZT 123 3972 R2A
  41. 41. 4 Features and Services in HLR 10ISDN ORIGINATING DATA CALL 5 3 HLR 2 6 ISDN 4 GMSC/ VLR 8 7 BSC 1 DTI ISDN BC + B - NUMBER 9 PAGING Figure 4-16 ISDN Originating Data Call to PLMN When an incoming Data call from ISDN is received in the GMSC, the ISDN Bearer Capability (ISDN BC) is sent in the SET UP message (step1). The GMSC sends a request for routing information to the HLR, to locate the subscriber. Included in this message is the ISDN BC (step 2). The HLR translates the received ISDN-BC into a GSM-BC (hardcoded in block HBCAN). For instance, the call from ISDN was an asynchronous 9600 baud/s data circuit call. That call corresponds to Bearer Service 26 according to the GSM specification. A check is now made to see if the called subscriber has a subscription for this bearer service. If they have, it is defined as follows (step 3): HGSDC:MSISDN=34 151..., SUD=BS26; The BC, from the list of supported BCs, is defined with the command HGBDI and is retrieved. If the dialed B-number was an additional MSISDN(AMSISDN), which could be the caseEN/LZT 123 3972 R2A – 109 –
  42. 42. GSM HLR 10 Operation and Maintenance even though the call was initiated from ISDN, the HLR checks which BC it is connected to. HGAMI:MSISDN=34 151.., AMSISDN=34250...,BC=269; In HGBDI, the characteristics of the BC=269 are collected. HGBDI: BC=269, UDI, RC=5-0-3, ACC=1-0-1, ITN=1-12, ACCST=1-0-1-3; If the MSISDN has the subscription, the HLR sends a message to the VLR, where the subscriber currently is located, asking for a roaming number (step 4). In the message, the translated GSM BC is also included, retrieved either from translation of the ISDN BC or the BC defined in HGAMI. The VLR temporarily connects a roaming number to the dialed subscriber and sends it back to the HLR (step 5). The HLR sends the roaming number back to the GMSC (step 6). This number is analyzed in the VLR and the Telecommunication service analysis is invoked. Since it is a data call, the output from the analysis leads to a route going towards the DTI ( or to the GIWU) (step7). When the DTI (or GIWU) has connected the proper equipment, (step 8) the MS is then paged (step 9). Upon reception of the page response from the MS, the call is established and the data file can be sent.HIGH SPEED CIRCUIT SWITCHED DATA (HSCSD) IN HLR This service enables the mobile station subscriber to establish a data or fax connection with speeds above 9.6 kbps. To achieve higher speeds two or more time slots in one radio channel is used. Each time slot being capable of carrying 9.6 kbps. HSCSD will be implemented in GSM 1900 standard in the same way it is done for GSM 900 and 1800. However, it is not included in any GSM 1900 specifications. This functionality affects the following services: • Asynchronous services: – New user rates: 14.4, 19.2, 28.8 and 38.4 kbit/s. – New modem types: V.32bis and V.34. • Synchronous services: – 110 – EN/LZT 123 3972 R2A
  43. 43. 4 Features and Services in HLR 10 – New user rates: 14.4, 19.2, 28.8, 38.4, 48 and 56 kbit/s. – New modem types: V.32bis and V.34. – RDI is also supported. • High Speed Fax and alternate Speech/Fax – New user rate: 14.4 kbit/s. – New modem types: V.32bis and V.34. The inclusion of HSCSD services implies handling of two new Bearer Services in the HLR. These Bearer Services are General Asynchronous Bearer Service (BS2G) for Asynchronous transmissions, and General Synchronous Bearer Service (BS3G) for synchronous. The subscription of one of these Bearer Services is incompatible with subscription of the other Bearer Service which is included in the same BSG. For handling HSCSD terminating calls properly, a new interface towards the data base for optimizing the analysis of bearer capabilities will be defined. 02(0 6(59,( MSC DTI BSC BS V.34 Modem BTS Transparent: up to 3 timeslots Non Transparent: up to 4 timeslots 3671 Transparent: up to 28.8 kbps Non Transparent: up to 33.6 kbps V.34 Modem Figure 4-17 HSCSD módem serviceEN/LZT 123 3972 R2A – 111 –
  44. 44. GSM HLR 10 Operation and Maintenance 8, 6(59,( MSC DTI BSC BS V.110 rate BTS adaptation Transparent: up to 4 timeslots Non Transparent: up to 4 timeslots ,61 Transparent: up to 38.4 kbps Non -Transparent: up to 38.4 kbps V.110 TA Figure 4-18 HSCSD over ISDNDefinitions High Speed Circuit Switched Data service (HSCSD): HSCSD services are GSM phase 2+ services which requires a multi-slot configuration. This configuration is useful for higher rates of data transmission and allowing new services, such as Video communications, in the GSM network. General Bearer Services: A single service is defined independent of the fixed network used rate. A subscription to a General Bearer Service comprises the subscription to all individual single services of its group. A subscriber shall not have a simultaneous subscription to a General Bearer Service, and any of the individual single services covered by the General Bearer Service. Fall-Back Bearer Service: The Bearer Service is used when the General Bearer Service is included in the same BSG and the BS is not supported for any other reason. E.g., communication with a MSC/VLR that does not support subscription to General Bearer Services. – 112 – EN/LZT 123 3972 R2A
  45. 45. 4 Features and Services in HLR 10 The provision of this service is optional and it is done on a subscriber basis. It is only used if there is no other data available.Implementation The introduction of HSCSD implies the creation of 2 new SUDs/BSs in the HLR. These SUDs are: BS2G Asynchronous General Bearer Service, which is included in the BSG BS 20. The string assigned for this SUD is ‘BS2G.’ It is referred to in the GSM documents as BS20. BS3G Synchronous General Bearer Service, which is included in the BSG BS30. The string assigned for this SUD is ‘BS3G.’ It is referred to in the GSM documents as BS30. Apart from these SUDs, two more SUDs must be defined in the HLR to support the subscription of the Fall-Back Bearer Service associated with the corresponding General Bearer Service subscribed. These 2 new SUDs are: BS2F Fall-Back Bearer Service is used when the BS2G, general Asynchronous Bearer Service, is not supported by MSC/VLR. The possible values of this SUD are: 0 No Fall-back BS subscribed 1 The Fall-back BS is BS21 2 The Fall-back BS is BS22 3 The Fall-back BS is BS24 4 The Fall-back BS is BS25 5 The Fall-back BS is BS26 BS3F Fall-Back Bearer Service is used when the BS3G, general Asynchronous Bearer Service, is not supported by MSC/VLR. The possible values of this SUD are: 0 No Fall-back BS subscribed 1 The Fall-back BS is BS31 2 The Fall-back BS is BS32 3 The Fall-back BS is BS33EN/LZT 123 3972 R2A – 113 –
  46. 46. GSM HLR 10 Operation and Maintenance 4 The Fall-back BS is BS34 The 4 SUDs, BS2G, BS2F, BS3G and BS3F, must be included in the process of execution of this command. All parameters related to each one of these SUDs must be included in block HTRAN, and space must be reserved in the subscriber data records (block HSD) to store the subscription of these new services. Format of the HGSDC command is not changed, but COD must include fault codes to indicate incompatibility among services.HGBDI Command: New parameters and units for defining the HSCSD Bearer Capability and the new fixed network interface, must be included. Command format remains the same: Restricted Digital Information (RDI). If it is present, the presence of parameter Information ACCess STructure (ACCST) is mandatory. The new units (omt and fnur) are included as part of the general parameter Radio Channel (RC) as follows: omt Other Modem Type 0 No other modem type 1 V.32 bis 2 V.34 fnur Fixed Network User Rate 0 Not applicable 1 9,6 kbit/s 2 14,4 kbit/s 3 19,2 kbit/s 4 28,8 kbit/s 5 38,4 kbit/s 6 48,0 kbit/s 7 56,0 kbit/s 8 64,0 kbit/s – 114 – EN/LZT 123 3972 R2A

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