Specifications

Dispatch Call Types
Dispatch Call Processing
August 08, 2000 68P81095E55-E 4-15
Limitations
The iDEN system has physical and programmable limitations to service and
coverage. The obvious limitations are hardware related. Capacity and traffic
planning is required to assure the system can support the call volume generated by
the users. (refer to Appendix limits)
Region
Urban IDs allow an MS from one region to be uniquely identified in another region
without conflict. The additional of this identifier reduces the potential for registration
and authentication conflicts. There can be approximately 11 million Urban IDs
Domain
If a region contains a DAP-cluster or more than one DAP, all DAPs in the cluster
service the same region. The service provider can configure the D-HLR and D-VLR
databases to permit or restrict mobility across the domains.
Service Area
A Service Area is a logical unit that is used to limit the range of a fleet’s group call.
Normally a group call will only require resources from a small group of EBTSs. By
reducing the amount of MSs in a group call the system resources used is reduced.
Location Area
A Dispatch Location Area can be used to manage and track the mobility of an MS.
An MS is located by this group of cells.
Enhanced Base Transceiver System
An EBTS may be either Omni-directional or 3-sector. For 3-sector EBTSs, each cell
is a sector.
Physical limitations of EBTS relate primarily to the number of Base Radios and
dynamics of the radio link. The more Base Radios, the more control and traffic
channels available in a specific area. With more radios available in the EBTS, the
more span line facilities, DACs, and DAP resources will be required to support the
increase in radio link capacity. Refer to the iDEN RF Planning Guide and the iDEN
RF Subsystem/RF Link Optimization Manual.
Dispatch Application Processor
The DAP may be implemented in two forms. This will depend on the age and the
size of the system. The implementation of the DAP and the software release are a
major determining factor in the capacity and functionality of the iDEN system.
• R4400 N-DAP — to support 90K Dispatch Equipment Subscribers (DES)
• R10000-DAP — to support 180K DES
Fleet
Each fleet is provisioned in a single DAP. Each DAP can support 10,000 unique fleet
IDs. For example, a N-DAP cluster of 6 DAPs can support up to 60,000 fleet IDs.
Group
The maximum number talk groups per fleet is 255.
User
An MS can support up to 3 Number Assignment Modules (NAMs). Each NAM of an
MS can only be in 1 fleet. The feature supports Multiple Simultaneous Talkgroups
and assumes the MS can support and is configured to support multiple NAMs.