IP DECT/WLAN server environment
|
|
 |
| |
IP DECT/WLAN server environment
The server(s) in the network can either be installed centralized or distributed depending on chosen IP network topology and transmission technology. The server tasks can be distributed on one or more Linux servers for sharing processing load and for adding system redundancy in order to handle server and network failures. The management server(s) are typically based on a MS Windows environment.
The servers can be divided in three different categories:
1. IP DECT/WLAN controller
2. HLR database server
3. Management servers
The first two categories are critical for maintaining the network services and must be kept in operation at all times. The last category is for support and maintenance only, but is desirable to keep in operation for continuing performance monitoring and fault alarming.
Server configuration
Depending on the system size and general network requirements, the server hardware configuration varies.
In a small system the HLR and IP DECT/WLAN controller can be installed on the very same Linux server. Such server could even be flash disk based for avoiding moving parts and achieving high reliability. In such a small system typically the management server part could typically be installed on Windows workstation and be put in operation only when system maintenance is needed.
In a large system it is necessary to achieve more server capacity for control of a large number of base stations in many clusters. It is also very desirable to build the system with redundancy on these server elements as well as the central network infrastructure.
Typically the HLR is duplicated on two servers, both of which can respond to lookup requests. The IP DECT/WLAN controllers are designated to server a part of the network clusters. A server can typically handle a maximum of 4000 base stations. In order to achieve redundancy, spare capacity must be reserved on all servers. Every cluster is configured with a designated primary server and a secondary server. If this primary server happens to be unavailable, a cluster connects to a secondary server. Clusters are configured differently in order to spread server load and gain redundancy.
IP DECT/WLAN controller
This server is the key controlling element in the network. It is based on a Linux OS environment. The main tasks of the IP DECT/WLAN controller are:
- IP address assignment (DHCP) to synchronization units and base stations
- Configuration of network elements (synchronization units, base stations and servers) via configuration files stored on TFTP database
- SIP User Agent functionality
- DECT DLC/NWK protocol layers
- SIP / DECT call control interworking
- SMS receive/transmit
- Mobility, media stream management
- Network event logging
- Traffic event logging and performance monitoring
- Terminal equipment information and status
- Network and terminal surveillance
- Terminal maintenance, over-the-air (OTA) firmware updates
HLR server
The HLR server stores the identity and other individual information related to the wireless terminals that are needed to be known by the network, in a common database. This information is retrieved by the IP DECT/WLAN controller that is serving the actual part of the network where a terminal is located.
Management server
The Management servers consist of 3 main parts:
- IP DECT/WLAN Configuration Manager. This handles the configuration of all network elements. It is used to produce the configuration files on the TFTP server for all the network elements. It is also used for low level dedicated networking monitoring.
- SNMP manager (3rd party). Inspection of detailed SNMP parameters in all network and server elements. Collections of SNMP traps (including alarm events)
- IP DECT/WLAN Terminal Manager. Monitoring and management of all wireless terminals, including over-the-air firmware upload. It has functionality for collections of traffic statistics and logging of traffic events.
These components are installed on one or multiple MS Windows server platforms. From workstations the system managers and operators can connect to these servers in a client/server environment for efficient system management. For small systems the server and client software can run on the same workstation.
|
|
|
|
| Wireless IP Network System |
 |
|
|
|
White Papers
Download our commercial and technical white papers about wireless IP network systems.
|
|
|
|
|
|
|
|
