USSD Standardization in cdma2000 Networks Contact: Roozbeh Atarius...

USSD Standardization in cdma2000 Networks

Contact:

Roozbeh Atarius ([email protected])

Recommendation: Discuss and adopt.

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Documentations in 3GPP2 and 3GPP

• USSD is abbreviation for Unstructured Supplementary Service Data.

• Specifications in 3GPP are TS22.090 (stage 1), TS23.090 (stage 2), and TS24.090 (Stage3).

• Other related specifications are TS22.030 for MMI for USSD and TS23.038 for the alphabet indicator and data coding scheme. TS24.010 (Stage 3) for Mobile radio Interface layer3.

• Documents in 3GPP2 X.S0065 (USSD specification) CR.1001 to add new DBM. A.S0013 to include the Delivery mechanism of the new DBM A.S0014 to include the precedures for the new DBM X.S0004-641-E to include a new ServiceIndicator parameter for USSD.

Changes to C.R1001

• Add a new DBM for Unstructured Supplementary Service Data with value “001001”.

• Add service option numbers 77 for USSD Rate Set 1 and 78 for USSD Rate Set 2.

• Add service option group 10 for USSD.

• Add reference to X.S0065

Changes to A.S0013

• 2.44 USSD Support

The Unstructured Supplementary Service Data (USSD) for the transfer of the messages within the USSD transaction between the MS and USSD GW. The procedures for USSD is described in X.P0065.

Changes to A.S0013 (1/11)

3.39 Unstructured Supplementary Services Data (USSD)

3.39.1 USSD DBM Delivery on a Common Channel

3.39.1.1 USSD DBM Receipt from an MS on the Access Channel

a. The MS sends a USSD DBM to the network on the Access Channel.

b. If the MS had requested a Layer 2 Ack, the BS acknowledges the USSD DBM received on the Access Channel by sending a Layer 2 Ack on the Paging Channel.

c. The BS sends an ADDS Transfer message to the MSC containing the USSD DBM received from the MS in the ADDS User Part element.


3.39.1.2 USSD DBM Delivery to an MS on a Common Channel - Example1

a. The MSC determines that a USSD DBM is to be sent to an idle MS.The MSC sends an ADDS Page message to the BS. The ADDS Page contains the USSD DBM in its ADDS User Part information element.If the MSC requires an acknowledgment, it includes the Tag information element in the ADDS Page message and starts timer T3113.

b. The BS sends the USSD DBM to the MS on the Paging Channel or the Forward Common Control Channel. Before sending the USSD DBM, the BS may perform vendor specific procedures such as paging the MS to determine the cell in which the MS is located.

c. If a Layer 2 Ack was solicited, the MS acknowledges the receipt of the message by a Layer 2 Ack.d. If the MSC requested an acknowledgment by including the Tag information element in the ADDS Page

message, the BS replies with an ADDS Page Ack message including the Tag information element set identical to the value sent by the MSC. If timer T3113 was previously started, it is now stopped.


3.39.1.3 USSD DBM Delivery to an MS on a Common Channel - Example 2 (without Early Traffic Channel Assignment)


a. The MSC sends a Paging Request message to the BS and starts timer T3113.

b. The BS sends a Page Message on the Paging Channel.

c. The MS responds with a Page Response Message.

d. The BS sends a Complete Layer 3 Information message containing a Paging Response message to the MSC and starts timer T303. Upon receipt of this message the MSC stops timer T3113.

e. The BS sends a Base Station Ack Order to acknowledge the Page Response Message from the MS.

f. The Radio Environment and Resources element in the Paging Response message indicates no early traffic channel assignment by the BS. The MSC sends an ADDS Page message to the BS. The ADDS Page message contains the USSD DBM in its ADDS User Part information element.

If the MSC requires an acknowledgment, it includes the Tag information element in the ADDS Page message and starts timer T3113.

g. The BS sends the USSD DBM to the MS on either the Paging Channel or the Forward Common Control Channel.

h. If a Layer 2 Ack was solicited, the MS acknowledges the receipt of the message by a Layer 2 Ack.

i. If the MSC requested an acknowledgment by including the Tag information element in the ADDS Page message, the BS replies with an ADDS Page Ack message including the Tag information element set identical to the value sent by the MSC. If timer T3113 was previously started, it is now stopped.

j. The MSC releases the underlying transport connection to clear the pending page response. The BS stops timer T303 during this process.

k. The BS, upon the release of the underlying transport connection, sends a Release Order to the MS.


• 3.39.1.4 USSD DBM Delivery to an MS on a Common Channel - Example 3 (with Early Traffic Channel Assignment)


a. The MSC sends a Paging Request message to the BS and starts timer T3113.

b. The BS sends a Page Message on the Paging Channel.

c. The MS responds with a Page Response Message.

d. The BS sends a Complete Layer 3 Information message containing a Paging Response message to the MSC and starts timer T303. The MSC stops timer T3113.

e. The BS sends a Base Station Ack Order to acknowledge the Page Response Message from the MS.

f. The BS establishes a traffic channel to the MS.

g. The Radio Environment and Resources element in the Paging Response message indicates early traffic channel assignment by the BS. The MSC refuses the underlying transport connection. The BS stops timer T 303.

h. The BS, upon the refusal of the underlying transport connection, sends a Release Order to the MS.

i. The MS sends a Release Order to the BS to acknowledge the release.

j. The MSC sends an ADDS Page message to the BS. The ADDS Page contains the USSD DBM in its ADDS User Part information element. Note that the MSC should wait a sufficient amount of time after step ‘g’ before sending this message, to allow steps ‘h’ and ‘i’ to complete.

If the MSC requires an acknowledgment, it includes the Tag information element in the ADDS Page message and starts timer T3113.

k. The BS sends the USSD DBM to the MS on either the Paging Channel or Forward Control Channel.

l. If a Layer 2 Ack was solicited, the MS acknowledges the receipt of the message by a Layer 2 Ack.

m.If the MSC requested an acknowledgment by including the Tag information element in the ADDS Page message, the BS replies with an ADDS Page Ack message including the Tag information element set identical to the value sent by the MSC. If timer T3113 was previously started, it is now stopped.


3.39.1.5 USSD DBM Delivery to an MS on a Common Channel - Example 4 using Registration Procedures


a. The MSC sends a Registration Request message to the BS and starts timer Tordreg.

b. The BS sends a Registration Request Order on the common signaling channel.

c. The MS responds with a Registration Message.

d. The BS sends a Complete Layer 3 Information message containing a Location Updating Request message to the MSC and starts timer T3210. The MSC stops timer Tordreg.

e. The MSC sends a Location Updating Accept message to the BS. The BS stop timer T3210. This message releases the underlying signaling connection.

f. The BS may optionally send a Registration Accept Order to the MS.

g. The MSC sends an ADDS Page message to the BS. The ADDS Page contains the USSD DBM in its ADDS User Part information element. If the MSC requires an acknowledgment, it includes the Tag information element in the ADDS Page message and starts timer T3113.

h. The BS sends the USSD DBM to the MS on either the Paging Channel or Forward Control Channel.

i. The MS acknowledges the receipt of the message by a Layer 2 Ack.

j. If the MSC requested an acknowledgment by including the Tag information element in the ADDS Page message, the BS replies with an ADDS Page Ack message including the Tag information element set identical to the value sent by the MSC. If timer T3113 was previously started, it is now stopped.


3.39.2 USSD DBM Delivery on theTraffic Channel

3.39.2.1 USSD DBM to an MS on a Traffic Channel


a. The MSC determines that a USSD DBM is to be sent to the MS while it is on the traffic channel. Alternatively, if the MS is not on a traffic channel, a USSD-MT call is established using call flows in section 3.1.2; the service option used in this case is either ‘4DH’ or ‘4EH’.

b. The MSC sends an ADDS Deliver message to the BS. The ADDS Deliver message contains the USSD DBM in the ADDS User Part element.

c. The BS transmits the USSD DBM over the forward traffic channel. If the BS does not receive an acknowledgment after transmitting the USSD DBM, it shall retransmit the message. If the BS reaches the maximum number of retransmissions, it shall declare a Layer 2 Ack failure and initiate call clearing.

d. The MS acknowledges delivery of the USSD DBM on the traffic channel with a Layer 2 Ack.

e. If the MSC has requested a response by including the tag element in the ADDS Deliver message, the BS replies with an ADDS Deliver Ack message when it has received acknowledgment from the MS that the message was delivered. If a Tag element was included in the ADDS Deliver message, the BS shall include the Tag element in the ADDS Deliver Ack message, and set it to the same value as that received in the ADDS Deliver message.

f. The MS may remain on the traffic channel (e.g. if a voice call is in progress in step ‘a’). Alternatively, the MSC may initiate call clearing if a traffic channel was established in step ‘a’ using SO ‘4DH’ or ‘4EH’. Refer to section 3.2.4.3.


• 3.39.2.2 USSD DBM Receipt from an MS on a Traffic Channel

a. An MS that is currently on a traffic channel determines that a USSD DBM is to be sent to the network. Alternatively, if the MS is not on a traffic channel, a USSD-MO call is established using call flows in section 3.1.1.1; the service option used in this case is either ‘4DH’ or ‘4EH’.

b. The BS receives a Traffic Channel USSD DBM from an MS on the traffic channel. c. If a Layer 2 Ack was requested by the MS, the BS sends a Layer 2 Ack to the MS on the traffic channel.d. The BS sends an ADDS Deliver message to the MSC. The ADDS User Part element contains the USSD DBM

which was received from the MS.e. The MS may remain on the traffic channel (e.g. if a voice call is in progress in step ‘a’). Alternatively, the MS

may initiate call clearing if a traffic channel was established in step ‘a’ using SO ‘4DH’ or ‘4EH’. Refer to section 3.2.4.1.


2.6.1.1 Successful OperationWhen the MSC determines that it needs to deliver an SMS message to a specific idle MS, and a Layer 2 Ack notification is required from the MS, the MSC sends the ADDS Page message containing a Tag IE to the BS, starts timer T3113, and waits for the ADDS Page Ack message.When the MSC determines that it needs to deliver an SMS message to a specific idle MS, and the MSC does not require a Layer 2 Ack notification, the MSC sends the ADDS Page message, without a Tag IE, to the BS.The Tag IE, when present, indicates to the BS that a Layer 2 Ack is required from the MS. It can be used by the MSC to uniquely identify the ADDS Page message. If the Tag IE is present in the ADDS Page message, then the BS shall save it and return the same value in the Tag IE of the ADDS Page Ack message. When the MSC determines that it needs to deliver an SMS Broadcast message, and the MSC desires a response from the BS, the MSC starts timer T3113, sends the ADDS Page message containing a Tag element to the BS, and waits for the ADDS Page Ack message. The Tag IE, when present indicates to the BS that an ADDS Page Ack response message is requested. However, the BS is not required to solicit Layer 2 Acks from the MS. If the Tag element is present, the BS shall save it and return the saved value in the Tag IE of the ADDS Page Ack message.If the MSC needs to send position location data to an idle MS, the MSC sends an ADDS page message to the BS with the Data Burst Type field of ADDS User Part IE set to Position Determination Services (PDS). The MSC includes a Tag IE in the ADDS Page message to request the BS to wait for a Layer 2 Ack from the MS before the BS acknowledges the message. The BS saves the Tag value and returns it in the Tag IE of the ADDS Page Ack message. The MSC starts timer T3113 and waits for an ADDS Page Ack Message.When the MSC determines that it needs to deliver a SDB to an idle MS, the MSC sends a ADDS Page message to the BS with the Data Burst Type field of the ADDS User Part IE set to ‘SDB’. The MSC may include a Tag IE in the ADDS Page message to request the BS to wait for a Layer 2 Ack from the MS before the BS acknowledges the message. If the Tag element is present, the BS saves the Tag value and returns it in the Tag IE of the ADDS Page Ack message. The MSC starts timer T 3113 and waits for an ADDS Page Ack Message.When the MSC is to send USSD transaction to an idle MS, the MSC sends an ADDS page message to the BS with the Data Burst Type field of ADDS User Part IE set to Unstructured Supplementary Service (USSD). The MSC shall include a Tag IE in the ADDS Page message to request the BS to wait for a Layer 2 Ack notification from the MS before the BS acknowledges the message. The MSC shall not include a Tag IE in the ADDS Page message, if the MSC does not require a Layer 2 Ack notification. If the tag IE is present, the BS shall save the Tag value and returns it in the Tag IE of the ADDS Page Ack message. The MSC shall start timer T3113 and shall wait for an ADDS Page Ack Message.


2.6.3.1 Successful OperationWhen the BS receives an application data message for SMS, USSD or PDS from the MS on the access channel, it sends it to the MSC in an ADDS Transfer message. The BS includes the SMS, USSD or PDS message in the Application Data Message field in the ADDS User Part element and sets the Data Burst Type field of the ADDS User Part element to ‘SMS’, ‘USSD’ or ‘PDS’.If the BS sends the ADDS Transfer message to the MSC for authentication purposes in the case of SDB, an MS origination with CCPD mode or alternate dormant mode handoff, the BS sets the Data Burst Type field of the ADDS User Part element to ‘SDB’ (for SDBs or CCPD Mode) or ‘Asynchronous Data Services’ (for alternate dormant mode handoff) and includes a Tag IE. The BS starts timer T60.

2.6.5.1 Successful OperationWhen the MSC or BS needs to deliver an application data message while a traffic channel exists, the sender includes that application data message (SMS, USSD, PDS, SDB or OTASP) in an ADDS Deliver message and sends it across the A1 or A1p interface. In the MSC to BS direction, the Tag IE, when present, indicates to the BS that a Layer 2 Ack is required from the MS. It can be used by the MSC to uniquely identify the ADDS Deliver message. If the Tag IE is present in the ADDS Deliver message, then the BS shall save it and return the same value in the Tag IE of the ADDS Deliver Ack message.

2.6.6 ADDS Deliver AckThis DTAP message is sent from the BS to the MSC when the BS receives a Layer 2 Ack from the MS for an ADDS Deliver message that contains a Tag IE. In the case of OTASP, PDS, USSD and SMS, this message is sent from the BS to the MSC to report that an acknowledgment or a rejection from the MS has been received for application data delivery.

3.1.4 Paging RequestAdd 004DH (USSD Rate Set 1) and 004EH (USSD Rate Set 2) in Table 3.1.4 (Paging Request) for Octet 3.NOTE 004CH for Tunneled Traffic Channel SMS Support in E-UTRAN-1x Interworking is missing in this table. This is untrelated to USSD.


3.1.7 Assignment Request

…

b. This element is not included when a terrestrial resource is not required. When the Service Option element indicates one of the following {Markov, loopback, packet data, OTAPA, SMS, USSD, Test Data, IS-2000 Markov, IS-2000 Loopback, PDS}, this element is not included in the message. This element contains the circuit identifier allocated by the circuit-switched MSC.

…

Add 004DH (USSD Rate Set 1) and 004EH (USSD Rate Set 2) in Table 3.1.7 (Assignement Request) for Octet 3.

NOTE 004CH for Tunneled Traffic Channel SMS Support in E-UTRAN-1x Interworking is missing in this table. This is untrelated to USSD.


3.1.8 Assignment Complete…

b. If the service option value included in the Assignment Request message was 8000H, 0011H, 0038H, 0003H, 0044H, 0046H, 0049H, 1049H or 003EH (13K speech, 13K high rate speech, SMV, EVRC, EVRC-B, EVRC-WB, EVRC-NW without COP 0, EVRC-NW with COP 0 or Wideband Speech Codec), then the only allowable values that may be sent on this message are those same service options.If the service option value included in the Assignment Request message indicated a fax call, then the only allowable values that may be sent on this message are fax service options.If the service option value included in the Assignment Request message indicated a data call, then the only allowable values that may be sent on this message are data service options.If the service option value included in the Assignment Request message indicated a Circuit Switched Video Conferencing data call, then the only allowable values that may be sent in this message are Circuit Switched Video Conferencing data service options.If the service option value included in the Assignment Request message indicated an SMS call, then the only allowable values that may be sent on this message are SMS service options.If the service option value included in the Assignment Request message indicated either Markov or loopback procedures, then the only allowable values that may be sent on this message are values that indicate Markov or loopback procedures.If the service option value included in the Assignment Request message indicated an OTAPA call, then the only allowable values that may be sent on this message are OTAPA service options.If the service option value included in the Assignment Request message indicated a PDS call, then the only allowable values that may be sent on this message are values that indicate PDS service options.If the service option value included in the Assignment Request message indicated a USSD call, then the only allowable values that shall be sent on this message are values that indicate USSD service options.

If any of the above rules are violated, the MSC may initiate failure handling.


3.1.8 Assignment CompleteAdd 004DH (USSD Rate Set 1) and 004EH (USSD Rate Set 2) in Table 3.1.8 (Assignement Request) for Octet 3.NOTE 004CH for Tunneled Traffic Channel SMS Support in E-UTRAN-1x Interworking is missing in this table. This is untrelated to USSD

3.4.1 Handoff Required…u. This element specifies the information of the service options being handed off. This element is not present if the

Service Option element is present, but shall be present if the Service Option element is not present. This element may contain more than one service option. Multiple instances of 3G packet data (SO=21H) may be present. If this message is being used to hand off a packet data session, this element contains all active and dormant 3G packet data service instances which are associated with that packet data session. This element shall contain at most one instance from the following set of service options: 13K speech (SO=8000H), 13K high rate voice service (SO=11H), EVRC (SO=03H), 3G High Speed Packet Data (SO=21H), VoIP (SO=3CH, 3DH), SMV (SO=38H), EVRC-B (SO=44H), EVRC-WB (SO=46H), EVRC-NW without COP 0 (SO=0049H), EVRC-NW with COP 0 (SO=1049H) or Wideband Speech Codec (SO=3EH). If this element contains either OTAPA (SO 12H, 13H), SMS (SO 06H, 0DH), USSD (SO 4DH, 4EH) or PDS (SO 23H, 24H) then the number of service options included shall equal one.

…Add 004DH (USSD Rate Set 1) and 004EH (USSD Rate Set 2) in Table 3.4.1 (Handoff Required) for Octet 3.Add 004DH (USSD Rate Set 1) and 004EH (USSD Rate Set 2) in Table 3.4.1 (Handoff Required) for Octet i+2.Add 01010 (Unstructured Supplementary Service Data) in Table 3.4.1 (Handoff Required) for Octet k.NOTE many SO are missing in this table. Maybe, they do not work at the time of the handoff. Needs to be consulted by the group. This is unrelated to USSDNOTE service option group for (01001 Enhanced Voice Services) is missing in this table for Octet k. This is unrelated to USSD

…


3.4.2 Handoff Request

…

e. This element contains the full-rate circuit identifier allocated by the circuit-switched MSC.

In the case of hard handoff for an async data/fax call, this element indicates the Circuit Identity Code of the circuit to be connected to the target BS to support the A5 connection to the IWF.

In the case of hard handoff for a voice call, this element indicates the Circuit Identity Code of the circuit to be connected to the target BS to support the A2 connection.

In the case of hard handoff for a packet data call, SMS delivery on a traffic channel (SMS service option in use), OTAPA delivery on a traffic channel, USSD delivery on a traffic channel or PDS delivery on a traffic channel, this element shall not be included.

…

u. This element specifies the information of the service options being handed off. This element shall be present if it was received by the MSC from the source BS and if the Service Option element is not present in the Handoff Request message. This element may contain more than one service option. Multiple instances of 3G packet data (SO=21H) may be present. If this message is being used to hand off a packet data session, this element contains all active and dormant 3G packet data service instances which are associated with that packet data session. This element shall contain at most one instance from the following set of service options: 13K speech (SO=8000H), 13K high rate voice service (SO=11H), EVRC (SO=03H), 3G High Speed Packet Data (SO=21H), VoIP (SO=3CH, 3DH), SMV (SO=38H), EVRC-B (SO=44H), EVRC-WB (SO=46H), EVRC-NW without COP 0 (SO=0049H), EVRC-NW with COP 0 (SO=1049H) or Wideband Speech Codec (SO=3EH). If this element contains either OTAPA (SO 12H, 13H), SMS (SO 06H, 0DH), USSD (SO 4DH, 4EH) or PDS (SO 23H, 24H), then the number of service options included shall equal one.

…


3.4.2 Handoff Request

Add 004DH (USSD Rate Set 1) and 004EH (USSD Rate Set 2) in Table 3.4.2 (Handoff Required) for Octet 3.

Add 004DH (USSD Rate Set 1) and 004EH (USSD Rate Set 2) in Table 3.4.2 (Handoff Required) for Octet i+2.

Add 01010 (Unstructured Supplementary Service Data) in Table 3.4.2 (Handoff Required) for Octet k.

NOTE many SO are missing in this table. Maybe, they do not work at the time of the handoff. Needs to be consulted by the group. This is unrelated to USSD

NOTE service option group for (01001 Enhanced Voice Services) is missing in this table for Octet k. This is unrelated to USSD

3.6.1 ADDS Page

Add 001001 (USSD) in Table 3.6.1 (ADDS Page) for Octet 3 when ADDS User Part: A1 Element Identifier = [3DH].

3.6.3 ADDS Transfer

Add 001001 (USSD) in Table 3.6.3 (ADDS Transfer) for Octet 3 when ADDS User Part: A1 Element Identifier = [3DH].

3.6.5 ADDS Deliver

Add 001001 (USSD) in Table 3.6.5 (ADDS Deliver) for Octet 2 when ADDS User Part: Length = <variable>.

4.2.49 Service Option

Add 004DH (USSD Rate Set 1) and 004EH (USSD Rate Set 2) in Table 4.2.49-1 (Service Option Values) for Octet 2 and 3.

NOTE 004CH for Tunneled Traffic Channel SMS Support in E-UTRAN-1x Interworking is missing in this table. This is untrelated to USSD.


4.2.50 ADDS User Part…Application Data Message:

This field has variable length and is encoded as follows:If the Data Burst Type field is set to ‘Asynchronous Data Services (000001)’, the Application Data Message field is omitted.If the Data Burst Type field is set to ‘SMS (000011)’, the Application Data Message field is set to the CDMA SMS Transport Layer Message defined in [22].If the Data Burst Type is set to ‘OTASP (000100)’, the Application Data Message field is set the OTASP Data Message defined in [29]If the Data Burst Type field is set to ‘PDS (000101)’, the Application Data Message field is set to Position Determination Data Message defined in [24].If the Data Burst Type field is set to SDB (000110)’, the Application Data Message field contains the SDB formatted as specified by the Short Data Burst Format in [23] if included. Refer to section 3 for cases where this field is or is not included. If this element is used as part of the ADDS Transfer message to support Short Data Burst, it does not include the Short Data Burst application data in the Application Data Message field. If the Data Burst Type field is set to ‘SMS (001001)’, the Application Data Message field is set to the USSD transaction defined in [47].The Application Data Message field is omitted for CCPD mode and alternate dormant mode packet data handoffs.

…1.2.1 Normative References[47] 3GPP2 X.S0065-0 v1.0, cdma2000 Unstructured Supplementary Service Data (USSD).Editor’s Note: The above document is a work in progress and should not be referenced unless and until it is approved and published. Until such time as this Editor’s Note is removed, the inclusion of the above document is for informational purposes only.

MSC behavior

• MSC must be able to exchange the protocols towards the BS/MS and USSD-GW/HLR.

• MSC needs to recognize USSD DBM and generate an SMDPP Invoke towards USSD-

GW/HLR recognize SMDPP Invke containing the USSD information and generate a

USSD DBM towards the MS.

Documentations

• X.S0004-540 should be modified to contain: 2.64.1 SMSDeliveryPointToPoint Parameter Sets: PointToPoint Variant.

p. Include for CDMA USSD, CDMA OTASP or CDMA OTAPA.

• X.S0004-550 should be modified to contain: 2.231 ServiceIndicator

include value 4 for CDMA USSD Service.

• X.S0004-640 should be modified to contain the following or a separate specification need to capture the following: A new section for USSD procedure:

MSC behavior how to generate SMDPP Invoke towards USSD GW or HLR, when receiving the USSD DBM from the MS with an indicator that this is a new DBM.

MSC behavior how to generate the USSD DBM towards the MS when receiving the SMDPP Invoke from USSD GW or HLR with “ServiceIndictor” set to CDMA USSD.

• X.S0004-641 should be modified to by: extending section 3.4 (MSC Receiving an SMSDeliveryPointToPoint

INVOKE) to include CDMA USSD and refers to new section in X.S0004-640.

USSD Standardization in cdma2000 Networks Contact: Roozbeh Atarius...

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