This document defines radio interface support for USSD incdma2000®1 Spread Spectrum Systems.
Unstructured supplementary service data (USSD) allows the MobileStation (MS) user and a PLMN operator defined application tocommunicate in a way which is transparent to the MS and tointermediate network entities. The mechanism allows development ofPLMN specific supplementary services.
There are two modes of USSD: MMI-mode and application mode.MMI-mode USSD is for the transparent transport of MMI stringsentered by the user to the network and for the transparenttransport of text strings from the network that are displayed bythe mobile for user information.
Application mode USSD is for the transparent transport of databetween the network and the UE. Application mode USSD is intendedto be used by applications in the network and their peerapplications in the UE.
USSD may be initiated by the MS user, or by the network. UnlikeShort Message Service (SMS) messages, USSD messages create areal-time connection during a USSD session. The connection remainsopen, allowing a two-way exchange of a sequence of data. Severalexamples of how USSD Services are used include: Pre paid balanceInquiry, Balance Transfer (payment from one’s balance to anotherbalance), Voting (“Please rate our customer service: 1=Good, 2=OK,3=Bad” after a call to a Customer Service Center), and Call Me(requesting another party to call you).
- Edition:
- 12
- Published:
- 07/01/2012
- Number of Pages:
- 20
- File Size:
- 1 file , 3.1 MB
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