Thank you wikipedia. It says the scheme is: http://en.wikipedia.org/wiki/OFDMA
On Thu, Sep 18, 2008 at 8:58 AM, Christopher Chen <[EMAIL PROTECTED]> wrote: > Yep. basically. This is kind of curious, since UMTS > (Cingular^H^H^H^H^H^H^H^HAT&T "3G") uses a CDMA-like scheme. Of course > I'm pretty sure in practice TDMA is less "intensive" (read: power > consumption) that CDMA, which may have entered their considerations. > > Cheers > > cc > > On Thu, Sep 18, 2008 at 8:45 AM, Charles Wyble <[EMAIL PROTECTED]> wrote: >> >> If I am reading that right, it's TDMA correct? >> >> If so Berkeley is doing research in this area and developed a software >> stack for it: >> http://tier.cs.berkeley.edu/wiki/Wireless >> >> >> >> >> Joe Christensen wrote: >>> Hello all, >>> >>> Great meeting last night. One of the items unresolved was our >>> discussion of WIMAX and how it controls access to the network. I >>> looked it up on wikipeda and confirmed that WIMAX uses a time-slot for >>> each client, thus preventing one node from hogging the signal or data >>> collisions between clients. This is a big enhancement from wifi. >>> >>> From wikipedia: (http://en.wikipedia.org/wiki/WiMAX) >>> "In Wi-Fi the media access controller (MAC) uses contention access — >>> all subscriber stations that wish to pass data through a wireless >>> access point (AP) are competing for the AP's attention on a random >>> interrupt basis. This can cause subscriber stations distant from the >>> AP to be repeatedly interrupted by closer stations, greatly reducing >>> their throughput. This makes services such as Voice over IP (VoIP) or >>> IPTV, which depend on an essentially-constant Quality of Service (QoS) >>> depending on data rate and interruptibility, difficult to maintain for >>> more than a few simultaneous users. >>> >>> In contrast, the 802.16 MAC uses a scheduling algorithm for which the >>> subscriber station needs to compete only once (for initial entry into >>> the network). After that it is allocated an access slot by the base >>> station. The time slot can enlarge and contract, but remains assigned >>> to the subscriber station, which means that other subscribers cannot >>> use it. In addition to being stable under overload and over- >>> subscription (unlike 802.11), the 802.16 scheduling algorithm can also >>> be more bandwidth efficient. The scheduling algorithm also allows the >>> base station to control QoS parameters by balancing the time-slot >>> assignments among the application needs of the subscriber stations." >>> >>> >>> >>> Cheers, >>> >>> Joe >>> >>> On Sep 15, 2:39 pm, "Michael Weinberg" <[EMAIL PROTECTED]> >>> wrote: >>> >>>> Hello all, >>>> >>>> The next PTP meeting will be this Wednesday at 6:30pm at the Green >>>> Dragon on SE 9th and Yamhill. Let's gather outside in the nice patio >>>> area. >>>> >>>> You can post meeting items here, or just show up and share what's on your >>>> mind: >>>> >>>> http://www.personaltelco.net/WeeklyMeeting20080917 >>>> >>>> -- >>>> Michael Weinberg >>>> President >>>> Personal Telco Project, Inc. >>>> A 501(c)(3) Non-Profit >>>> >>> > >>> >> >> >> -- >> Charles Wyble (818) 280 - 7059 >> http://charlesnw.blogspot.com >> CTO Known Element Enterprises / SoCal WiFI project >> >> >> >> >> > > > > -- > Chris Chen <[EMAIL PROTECTED]> > "I want the kind of six pack you can't drink." > -- Micah > -- Chris Chen <[EMAIL PROTECTED]> "I want the kind of six pack you can't drink." -- Micah --~--~---------~--~----~------------~-------~--~----~ The Personal Telco Project - http://www.personaltelco.net/ Donate to PTP: http://www.personaltelco.net/donate Archives: http://news.gmane.org/gmane.network.wireless.portland.general/ Etiquette: http://www.personaltelco.net/index.cgi/MailingListEtiquette List information: http://lists.personaltelco.net To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] -~----------~----~----~----~------~----~------~--~---
