There is no protocol design that can achieve that. A TDD system is a population of time slots; if a bunch of users (not just a couple) with high traffic demand (not low traffic or small bursts) have low modulation, it will talke more time slots to serve them. If a fairness system based on bandwidth is in place them all of the users will still suffer; if a fairness system based on time-slots is in place they won't get the service you promised them. There is no free lunch.
I've run a 3.5 GHz WiMAX system with 3.5 MHz channels and the base station was always complaining the system was too oversubscribed; guess what, it was right, we were trying to serve more than feasible CIR/MIR traffic on those BSTs. Having a rule that only QAM16/QAM64 stations were allowed improved this problem a lot. Rubens On Mon, Apr 19, 2010 at 10:55 AM, Kurt Fankhauser <k...@wavelinc.com> wrote: > I too have heard from others that WIMAX was designed so that the customers > with poor connections don't take performance away from the rest with good > connections. So far I have yet to hear ANYONE disprove this. > > Kurt Fankhauser > WAVELINC > P.O. Box 126 > Bucyrus, OH 44820 > 419-562-6405 > www.wavelinc.com > > > > -----Original Message----- > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > Behalf Of Jeremie Chism > Sent: Monday, April 19, 2010 9:24 AM > To: WISPA General List > Subject: Re: [WISPA] Alvarion 3.65ghz NLOS as good as 900mhz? > > I am not using alvarion 3.65 but I am using wimax. I have a couple > customers with lower modulation because of non line of site situations > and have seen no impact on the entire system in general. "Supposedly" > wimax is engineered to handle some of this better than my alvarion 900. > > Sent from my iPhone > > On Apr 19, 2010, at 8:15 AM, Rubens Kuhl <rube...@gmail.com> wrote: > >> That would only be true if the data services are somewhat >> purpose-specific and not Internet access. Doing what this vendor told >> you would seriously affect aggregate performance of the cell because >> of low rate modulation of the NLOS and/or distant customers. >> >> If you are doing sensor networks or POS connection you will be fine >> with all those BPSK/QPSK customers, indeed. >> >> >> Rubens >> >> >> On Mon, Apr 19, 2010 at 10:09 AM, Kurt Fankhauser >> <k...@wavelinc.com> wrote: >>> Has anyone seen the Alvarion 3.65ghz 802.16e equipment in >>> operation? Was >>> talking to one vendor that claimed if you run the system in MIMO >>> that with >>> the diversity you can do NLOS as good as 900mhz and if you get the >>> AP on a >>> 300ft tower that it starts to "feel" like 700mhz. He claimed the >>> NLOS was so >>> good that people are ripping out complete old systems of 900mhz and >>> 2.4ghz >>> and putting in the single system of 3.65ghz to serve their entire >>> customer >>> base. >>> >>> >>> >>> Just wondering if anyone has experience or having seen this >>> firsthand. >>> >>> >>> >>> Kurt Fankhauser >>> WAVELINC >>> P.O. Box 126 >>> Bucyrus, OH 44820 >>> 419-562-6405 >>> www.wavelinc.com >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> --- >>> --- >>> --- >>> --- >>> -------------------------------------------------------------------- >>> WISPA Wants You! Join today! >>> http://signup.wispa.org/ >>> --- >>> --- >>> --- >>> --- >>> -------------------------------------------------------------------- >>> >>> WISPA Wireless List: wireless@wispa.org >>> >>> Subscribe/Unsubscribe: >>> http://lists.wispa.org/mailman/listinfo/wireless >>> >>> Archives: http://lists.wispa.org/pipermail/wireless/ >>> >> >> >> --- >> --- >> --- >> --- >> -------------------------------------------------------------------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> --- >> --- >> --- >> --- >> -------------------------------------------------------------------- >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ > > > ---------------------------------------------------------------------------- > ---- > WISPA Wants You! Join today! > http://signup.wispa.org/ > ---------------------------------------------------------------------------- > ---- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
