«ETSI TR 102 021-2 V1.3.1 (2010-12) Technical Report Terrestrial Trunked Radio (TETRA); User Requirement Specification TETRA Release 2.1; Part 2: High ...»
It is assumed that the introduction of HSD may not initially significantly release base station channels from the existing TETRA services, especially voice, and HSD equipment is added to the base station that needs to support more data services. Although HSD equipment cell coverage on the service point of view is at least the same as voice service coverage, the highest speed may need fill in base stations.
4.11 Availability of HSD From the user requirement's analysis by WG1 in May 2001 a number of respondents saw a market for HSD in 2005 onwards, with a similar number requiring a service before 2005. There is a section of the market that sees a need for HSD as early as 2002. Table 5 shows the respondent breakdown for HSD availability to support this requirement.
In order to understand how these different market needs may be accommodated more work is needed by WG1 to identify if an evolutionary approach to implementation can be specified, in view of potentially competing technologies such as UMTS/3G.
Recognizing the importance of standard evolution to support HSD services, the total requirement for the complete HSD suite of standards should be well understood to ensure that possible early implementation of basic HSD services do not impact future standard development work.
For Release 2.1 the time to market is more important than ever - even the traditionally very demanding traditional TETRA users, emergency services, are increasingly having to rely on commercial GPRS/3G networks for their mobile data needs while waiting for Release 2 HSD. For Release 2.1 to be a success it should be available within a shorter timescale from URS to implementation than Release 2.
4.12 Relative importance of HSD user requirement criteria As part of the TETRA Release 2 Questionnaire respondents were requested to indicate the relative importance of criteria relating to HSD. The results of this question are listed in table 6.
NOTE: Although this "relative importance weighting" is useful as a selection criteria for the HSD technology
solution, there are other non-user requirement criteria that also needs to be considered. For example:
It is also important to note that the number of respondents to the TETRA Release questionnaire was relatively small reflecting only a small number of large Public Safety and PAMR TETRA user organizations, and/or potential TETRA user organizations in Western Europe. Although the investment in TETRA by these user organizations is estimated to represent over 70 % of the TETRA market in Western Europe at the time, it is recognized that TETRA is being deployed in other regions of the world in a number of market segments outside Public Safety and PAMR. For this reason, a further review of user requirements may be necessary in order to provide an "overall importance weighting" for user requirements which should be used as part of the HSD technology selection within WG4.