1 / 8

ETSI MTS Meeting: 3GPP and SDL

ETSI MTS Meeting: 3GPP and SDL. Oct-2000. Telelogic's Position. Telelogic actively collaborates with the standardization bodies Contributors can obtain Telelogic UML, SDL and TTCN tools through ETSI All the Suites are both available on Windows and Unix

keran
Download Presentation

ETSI MTS Meeting: 3GPP and SDL

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. ETSI MTS Meeting: 3GPP and SDL Oct-2000

  2. Telelogic's Position • Telelogic actively collaborates with the standardization bodies • Contributors can obtain Telelogic UML, SDL and TTCN tools through ETSI • All the Suites are both available on Windows and Unix • A team led by Olle Hydbom is involved in 3G standardization work (and GSM) • Has directly supplied 3G contributors with some Tau licenses • Is providing expertise (for free) in order to make specifications processable by tools, e.g. Call control, etc. • There were some regressions with GSM specifications reused in the UMTS context

  3. Current Use of Modeling Techniques for UMTS Specifications Status by June-00 • Total number of specification documents = 238 • SDL = 32 • ASN.1 = 12 • MSC = 28 • UML Class diagram = 3 • TTCN = 3 • Sequence charts = 51 • State diagrams = 22 • Quality of the diagrams • Not necessarily formal and coherent • Mainly for informative description • Not clear if the SDL specifications are normative or informative

  4. Analysis of the Use of UML • UML is considered as not formal enough to provide valuable help in protocol specifications and has not been discussed in the RAN#2 methodology group at all. • Consequence: infrequent use

  5. Analysis of the Use of SDL/MSC • SDL is more used in UMTS than in GSM, but not enough • Much of the SDL comes from GSM • Too few new uses • An example of new use: Radio Link Control layer (RLC) • 80 pages • Informative • Time and SDL expertise were missing on the industrial contributor's side • Contributors: NTT Cocomo and Telelogic, Nokia as reviewers • Positive results in the use of SDL: Errors have been found by simulation • Conclusion: Limited dissemination of SDL

  6. Potential Benefits of Using SDL/MSC • UMTS is considerably more complex than GSM • This can lead to poor quality in the protocol specifications and be behind the delivery schedule • SDL is needed for • Better specification • Unambiguous • Detection of inconsistencies • Detection of errors by simulation • Easier production of conformance test cases • Production of TTCN test cases by simulating models

  7. Analysis of the Use of SDL/MSC • Causes • Reluctance of some customers to use SDL • Because they do not use SDL later in their development process • SDL is not sufficiently well-known by 3GPP contributors • And is considered as difficult to understand

  8. Proposal • Our feeling is that 3G contributors (telecom equipment manufacturers) are ready to use SDL, but they are not educated enough • To have more SDL in UMTS, ETSI should supply training classes • A concrete example: STF 160/161 is developing conformance test suites in TTCN (MAC, RLC and RRC layers…) • They hoped to start from formal SDL • They cannot use tools today due to lack of formal SDL • Consequence: be behind the time schedule

More Related