Multipath Routing

Wireless networking and computing systems have revolutionized the way people think about wireless communication. Very recently we have witnessed the enormous growth of mobile phone usage by virtue of the development in the cellular wireless communication. Yet another shorter range communication based on packet radio network has already established its feet in the ground. Completely wireless corporations, campuses, hotzones or even communities now might not be too far from the reality. Massive consumption of the IEEE 802.11a/b/g wireless cards and access points have shown that the thirst for wireless communication is on rise. Deployment of notebook PCs, PDAs and hand held computing systems are simply going to add more demand on the need of wireless specifically against the cables that must be streched from the distance. However, the thirst of going into complete wireless has not been fulfilled and users still desparately have to depend upon the wired connection.

The foremost reason is the mediocre capacity that is available for the data communication. The following table shows the bound on capacity of the avaialble network for data communication. Evidently, most of the current research in the different sectors of the wireless communication is focused on breaking every possible bounds on capacity[][]. In this regard, a new communication paradigmn has emerged, a wireless mesh network (WMN).

Introducing WMN of different scales might not be feasible right here so I keep my concentration within the bounds of wireless local area networks. Wireless mesh network for wireless LAN (WLAN mesh) is the upcoming technology, where a backbone of infrastructure routers will support the surrounding stations. Getting its birth from the concept of already well known ad hoc networks, WLAN mesh blends many other features from the current WLAN architecture, so as to say.. to give more capacity to the users for using the network.

The legacy wireless LAN architecure has one access point, normally connected to wireline and stations connected to it. Access point serve as a gateway for stations to get connected with the local area network, or be part of it aswell as the connection to the Internet. To be more precise, stations must be configured to a particular AP for getting access to the network services. So it forms a one level tree like structure with one root AP and theoritically any number of stations as leaves. Now in this envrionment, what are the goodies package brought by WLAN mesh?

Previously, in the WLAN architecture there is no exact definition of how APs can communicate with each other in the wireless environment. The infrastructure mesh network gives the right answer. Many wireless APs now can communicate with eachother with a well defined protocol. We are simply offered with more number of links and eventually more capacity. Further, any nodes can somewhat act like APs. For example a PC in a room can participate to perform like APs. It gives stations more flexibility to choose better access points.

To be continued...

celebration by the lake

I didn't took any pictures, because pictures can be decieving too, they dont' tell the story, instead I write and you can draw your own from the readings. How can anyone take the picture of the tears that doesn't unfurls, how any anyone see the pain that is hidden in the smoke and capped by the smile?

We spent the day in the hills of some Korean village, beside the lake made artificially for the sake of having that lake in that village. No doubt, it was beautiful because it was sorrounded by the hills and forest, it was calm and soothing, and people spending their weekend, fishing whole day. I saw some wives taking care of their children when her husband would spend the entire day pulling the hook. Pramod told me that the forest would give flowers before leaves springs up in the spring time. 5 minutes walk to up the small hill was our camp, few blocks and tents in the field, with a small court of korean football was managed by a talkative old man. We believed what he said about the camp that it was maintained by him.

The Day started with faith, hope and belongingness. For those who never met before during the festive, for those who met for the first time or may be last time, links were created and wishes were shared. It was an effort to keep the tradition up and running, along with burning something inside memory and to say something back at home. For some it was few moments to drive nostalgia away, and why not!! Moment showed the joy.

Lost in Ajou

Years of solitude has started in this world of strange language. It is as if you are alone even people walks and talks by your side when you don't understand them. Its like walking between herd of cows and buffalows, when the village cowboy feels the utter loneliness every day. No doubt the emotions can be seen even in the eyes of the animals.

No one here knows where the pieces are scattered. Where we lost precious stone? Don't we dream about it everyday? We have travelled so far to get that now, stone that would covert things into gold and make you live forever. Stone of fortune that have led us to live in this solitude for a long long time.

Nostalgia runs around in everyone's head. Peace is seen in our streets, and we have probably forgotton the bloody hounds. Beauty stays in mind, pain of past lost in the solitude of years comming by.