Specifications

Functions
Interconnect Call Processing
5-4 68P81095E55-E August 08, 2000
6:1 Interleaved The primary method of transmitting digital voice packet is to apply one voice packet
slot to a single TDMA frame (1 voice slot per 6 frame packets). The 6:1 interleaving
method is the lower-cost, greater-throughput method. Disadvantages are changes to
the coverage and optimization to assure audio quality. Refer to the iDEN RF
Planning Guide for more information.
3:1 Interleaved The 3:1 interleaving method uses two slots on a single TDMA frame. By effectively
doubling the amount of data being sent, the system can use an enhanced vococder
that samples voice more and provides better voice quality. Since the load on the
radio link is increased the throughput is reduced. This increases the amount of radio
equipment required when compared to the 6:1 method. The affects of interleaving on
coverage and RF optimization are discussed in the iDEN RF Planning Guide.
System Identifiers
Individual users of the iDEN system are uniquely identified on the system. The type
of identification will depend on the region. The iDEN system can be configured to
support the international and/or North American Dial Plan.
In both cases each MS on the system is assigned a Mobile Station International
Subscriber Directory Number (MSISDN). This is the unique identifier the allows
global accessibility of the MS. The ability to access the MS depends on the RF sub-
system frequency and roaming agreements between service providers.
In the iDEN system the MSISDN aliasing, service access and authorized services are
maintained and stored in the HLR. The MS location is in the VLR of the MSC.