Design ideas Face the previous user requirements, design goals and numerous technical issues, combined with the design principles of WLA, tidy up the design ideas below and prepare for the next design.
In the WLAN project, it is necessary to determine the installation location of the WLAN device by means of site survey to understand the materials of the building and various materials around it.
Since wireless signals travel in a straight line in the air, the ability of radio waves to transmit and receive data and the speed of transmission are affected by various objects in the surrounding environment. Every time an obstacle is encountered, the wireless signal is weakened; in particular, cast concrete walls, metal, paper, and ceramics have a great impact on wireless signals.
2) Network structureIt will adopt the current popular wireless LAN grouping method, namely the “Splic MAC†architecture, which mainly adopts the LWAPP protocol and uses the “slim†AP and WLAN controller networking to apply to the WLAN networking of the Hong Kong headquarters. Because the number of APs is large, the original "fat" AP networking mode is difficult to manage, and the workload is large, and the real-time data stream communication with strong mobility cannot be guaranteed. But "fat" APs can be deployed in small WLANs, such as the Beijing branch WLAN.
3) Wireless standardWLAN technology mainly follows the IEEE 802.11x series of standards. At present, domestic wireless network design and deployment mainly use wireless APs, controllers, and wireless terminals that support the IEEE 802.11 a/b/g standard. Devices that comply with the IEEE 802.11n standard (the next-generation high-speed wireless LAN standard) are now maturing and coming to market, so the development and application of wireless network standards should also be considered when designing.
4) Fault managementIn view of the WLAN traffic load, signal dead zone (caused by equipment failure), signal interference and rogue access points in Hong Kong headquarters, we can use automatic radio frequency (AutomaTIc RF) technology to automatically monitor and scan the surrounding wireless signals to achieve power. Automatic allocation, when the wireless AP device increases, decreases or fails, the wireless controller automatically adjusts the power of the wireless AP through the wireless controller (WLAN Controller), which can avoid the signal blind zone caused by a single point of failure, and can also avoid the power The enhancement causes signal collision and interference, and finally realizes dynamic seamless docking of each AP area.
In addition, automatic RF technology can detect, scan, locate, and drive out sources of interference such as malicious signals and rogue access points. At the same time, the dynamic channel (Dynamic Channel) allocation technology is implemented by means of automatic RF technology to avoid signal overlap caused by channel overlap between adjacent AP points. It is also possible to monitor the load of each AP through RF to achieve load balancing of traffic.
5) continuity and time delayIn view of the problem of transmission continuity and delay in the mobility and real-time data flow in the wireless network, wireless roaming (WLAN Roaming) technology can be used to implement Layer 2 Roaming and Layer 3 Roaming, which can be in the same controller domain. Internally, seamless roaming between different APs can be achieved, and Roaming can be implemented across APs between different controller domains, thus ensuring real-time smoothness of wireless voice and data networks.
6) Security aspectsIn terms of WLAN security, in addition to the technical means of the management side of the network structure, hardware facilities, security policy, and RF detection, it is also necessary to implement a security authentication technology for the client terminal of the wireless network, and verify the network user of the access terminal through the security authentication system. , monitoring, management, and logging operations.
7) Redundant configurationHardware redundancy can provide certain software and hardware redundancy backup for core devices such as wireless controllers, and dual-line backup for some important AP points.
8) Quality of Service (QoS)In terms of QoS, the standard implemented is IEEE 802.11e, which is a multimedia stream such as voice and video that requires high real-time performance. When data is transmitted, the data is prioritized for transmission, and ordinary data stream transmission can reduce the priority. For voice and video data, they can be prioritized.
The above is the design idea for this project WLAN deployment. Of course, in the actual deployment process, it can't be done in a few words. This idea is just a simple plan for an overall framework. From this simple plan, we can see that there are many specific technical problems in front of the designers. Looking forward to solving.
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