ceba i
espinacs/bledes
Wednesday, September 19, 2007
Proportional fair throughput allocation in multirate IEEE 802.11e wireless LANs
Albert Banchs · Pablo Serrano · Huw Oliver
The paper deals with multirate unfairness in a saturated scenario. The author provide a mathematical analysis and obtain a utility function to maximize. Then, provide differents approaches to achieve fairnes: CWmin tuning and TXOP tuning. Each of this approaches can also be applied in a centralized or distributed fashion.
In my first reading I had the feeling that the approach based on TXOP was somehow flawed, but I have to double-check to confirm.
There are many interesting things in this article, and I think that, after reading it, I can rewrite my own article from a different perspective.
The paper deals with multirate unfairness in a saturated scenario. The author provide a mathematical analysis and obtain a utility function to maximize. Then, provide differents approaches to achieve fairnes: CWmin tuning and TXOP tuning. Each of this approaches can also be applied in a centralized or distributed fashion.
In my first reading I had the feeling that the approach based on TXOP was somehow flawed, but I have to double-check to confirm.
There are many interesting things in this article, and I think that, after reading it, I can rewrite my own article from a different perspective.
Monday, September 17, 2007
Licence-exempt wireless communication systems
S Kawade and T Hodgkinson
It explains the problems of interferences that wifi deployments suffer from. This is a barrier for the widespread of unlicensed spectrum networks. The overall performance seriously decreases when the number of users/cells is increased, specially in those cases in which there is not careful planning. The authors suggest the use of self-organizing networks that control the output power. My personal opinion is that OFDMA, MIMO, and directional arrays should be other solutions for the problem.
It explains the problems of interferences that wifi deployments suffer from. This is a barrier for the widespread of unlicensed spectrum networks. The overall performance seriously decreases when the number of users/cells is increased, specially in those cases in which there is not careful planning. The authors suggest the use of self-organizing networks that control the output power. My personal opinion is that OFDMA, MIMO, and directional arrays should be other solutions for the problem.
Thursday, September 13, 2007
Evaluating the voice capacity of 802.11 WLAN under distributed control
Nidhi Hedge, Alexandre Proutière, James Roberts.
Too many interesting things. It provides a model for the delay, that we might implement to use it to compare it to ours. Additionally, they provide a second-order moment. Their worked is based on Bianchi's.
The second part deals with traffic differentiation and I want to highlight two conclusions. First, using CWmin we can protect VoIP without affecting TCP performance. Second, by means of AIFS, the voice can be protected to the point that TCP flows starve.
They also provide expressions to calculate TCP throughput. I should review the paper after I have included TCP traffic.
Too many interesting things. It provides a model for the delay, that we might implement to use it to compare it to ours. Additionally, they provide a second-order moment. Their worked is based on Bianchi's.
The second part deals with traffic differentiation and I want to highlight two conclusions. First, using CWmin we can protect VoIP without affecting TCP performance. Second, by means of AIFS, the voice can be protected to the point that TCP flows starve.
They also provide expressions to calculate TCP throughput. I should review the paper after I have included TCP traffic.
Integration of IEEE 802.11 WLANs with IEEE 802.16-Based Multihop Infrastructure Mesh/Relay Networks: A Game-Theoretic Approach to Radio Resource Mana
Dusit Niyato and Ekram Hossain
The authors present IEEE 802.16 as a solution to backhaul traffic from WLANs. They review the state of the art and present a theoretical bargain-game to optimize the transport over the IEEE 802.16 mesh network.
The authors present IEEE 802.16 as a solution to backhaul traffic from WLANs. They review the state of the art and present a theoretical bargain-game to optimize the transport over the IEEE 802.16 mesh network.
Subscribe to:
Posts (Atom)