1、QUESTION ITU-R 101-4/5*,*Quality of service requirements in the land mobile service(1990-1993-1995-2003-2007)The ITU Radiocommunication Assembly,consideringa) that there is a rapid development in methods for digitization of speech and its transportover IP networks;b) that this development gives new
2、possibilities to obtain higher system flexibilityand improved spectrum economy in the transmission of speech;c) that digitally encoded speech enables more privacy in speech communication;d) that new systems supporting multimedia telecommunication services with various degreesof performance are being
3、 introduced widely;e) that there may be advantages in adopting for the land mobile service standards thatare compatible with ITU-T Recommendations relevant to the fixed networks,decides that the following Questions should be studied1 Which measures of quality of multimedia services are relevant for
4、different land mobileapplications?2 What delay with respect to delivery of service and delay variation are acceptablefor different land mobile applications?3 What is the proper choice of encoding bit rates for multimedia services taking into accountquality requirements, channel coding techniques, ef
5、ficient frequency usage, and cost?further decides1 that the results of the above studies should be included in one or more Recommendations,Reports or Handbooks;2 that the above studies should be completed by 2010.Category: S2_* This Question should be brought to the attention of the Telecommunication StandardizationSector Study Groups 2 and 12.* Former Question ITU-R 101-4/8.
