Presentation 11/27: Broadband Wireless Media Access Control from 802.11 to 802.16

[Su Kim]

Broadband Wireless Media Access Control from 802.11 to 802.16

[jun.s...@asu.edu]

critique by Jun Shen

Overview:
The material mainly talks about the shortcoming of 802.11 MAC
protocol and how 802.16 overcome that flaw. Even 802.11 adopts CSMA to
raise the efficiency of spectrum, test result shows that the
scalability of 802.11 network is poor due to the phenomena of "Hidden
Nodes". 802.16 overcomes the flaw by introducing a centralized control
mechanism to avoid collision.

Strength:
1. 802.16 remove transmission collision by a centralized control.
Transmission must be allowed by access point.
2. To raise the efficiency, the channel is TDD-multiplexed and FDD-
multiplexed.




Weakness:
1. The centralized algorithm of 802.16 increases the burden of access
point, in other words, it increases the cost of access point. However
there is no quantitative explanation about this part.
2. The MAC solution of 802.16 requires every node report their
presence periodically, which occupies quite a part of resource of
mobile agents, especially for those power-constrained agents.

[Sean Williams]

Critique attached

On 11/27/07, Su Kim <suji...@gmail.com> wrote:

Broadband Wireless Media Access Control from 802.11 to 802.16

--
Sean A. Williams
Doctoral Student
Arizona State University

[Su Jin Kim]

Mike's

[Su Jin Kim]

Summary from Aarti