The Cellular Library can be incorporated into QualNet, EXata and NDT models, adding support for GSM communications.
In the Abstract Cellular Model, a single base station serves a circular service area that is divided into multiple sectors, each of which is allocated with a certain amount of bandwidth. For each base station, several control channels are defined. A large number of base stations cover the simulated area and they are connected to a hub, the switch center, with wired links. The hub routes the control and data messages to/from the base stations. An aggregated node emulates the services originated or destined to nodes outside the simulated area. A gateway connects to all the BSs and the aggregated node. With help from HLR, the gateway routes the information flows between MSs or between MS and the aggregated node.
The GSM model in QualNet models the behavior of Mobile Stations (MSs), Base Stations (BSs), and Mobile Switching Centers (MSCs), and the “Um” (BS-to-MS) and “A” (BS-to-MSC) interfaces. The MSs can be located anywhere and can be mobile. The BSs and MSC are stationary. The GSM model allows multiple MSs, multiple BSs, and a single MSC in any scenario. Each BS is connected to the MSC by a wired point-to-point link.
Implemented Features
- Configuration of MSC, multiple Base Stations, and multiple Mobile Stations
- Standard band is supported (900 MHz Mobile Stations and Base Stations)
- Cell selection and re-selection
- Dynamic channel assignment and release
- Location update
- Call setup and tear-down
- Handover (intra-MSC and inter-cell/Base Station)