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[STDS-802-16] Inverse Bandwidth Distance relationship



Hi Folks, 

greetings from the country with the  most advanced pre mobile -16e -  Wimax 
deployment in the world (1).I wondered if anyone could shed some light on an 
apparent facet of a wimax deployment. 

A couple of sources (2)(3)seem to suggest  that there is an inverse 
relationship between the available bandwidth to a user and the distance from 
the Base Station Radio (BSR).  I am specifically interested in the range 
limited case where it seems the modulation scheme changes 'down' the further 
away an active user is away from the BSR.(3) 

Assuming a uniform distribution of active users,in order to attempt to 
'ration out'  the available channel bandwidth, is it not possible to 
restrict b/w to  users that are closer to the BSR and using higher 
modulation schemes at the expense of users further away at the cells edge ? 

Otherwise it seems the system is no better than Wi-Fi where there definitely 
is an inverse relationship between the available b/w to a user and the 
distance (BSR received power) - MAC blocking protocol (CSMA-CD) aside aside 

thanks and regards 

David 


(1) Australia Leads the World in Mobile WiMAX - June 2006
http://www.prnewswire.co.uk/cgi/news/release?id=173747
(2) WiMAX – A new alternative for wireless broadband access - Figure at 
the end of the article.
http://www.eurescom.de/message/messageDec2004/WiMAX_A_new_alternative_for_wi 
reless_broadband_access.asp
(3)WiMAX Deployment Considerations for Fixed Wireless Access in the 2.5 GHz 
and 3.5 GHz Licensed Bands June 2005 Figure 1
http://www.wimaxforum.org/news/downloads/DeploymentConsiderations_White_Pape 
rRev_1_4.pdf