Return-Path: william@bourbon.usc.edu Delivery-Date: Fri May 4 20:20:54 2007 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on merlot.usc.edu X-Spam-Level: X-Spam-Status: No, score=-3.3 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00, NO_REAL_NAME autolearn=ham version=3.1.3 Received: from bourbon.usc.edu (bourbon.usc.edu [128.125.9.75]) by merlot.usc.edu (8.13.5/8.13.5) with ESMTP id l453Kswv013675 for ; Fri, 4 May 2007 20:20:54 -0700 Received: from bourbon.usc.edu (localhost.localdomain [127.0.0.1]) by bourbon.usc.edu (8.13.5/8.13.5) with ESMTP id l453Jtvx006637 for ; Fri, 4 May 2007 20:19:55 -0700 Message-Id: <200705050319.l453Jtvx006637@bourbon.usc.edu> To: cs551@merlot.usc.edu Subject: Re: Lecture 24 Date: Fri, 04 May 2007 20:19:55 -0700 From: william@bourbon.usc.edu Someone wrote: > 1) In lecture 24 slide 20 The "hidden terminal" Problem means A > sending to B while C interveans. > Correct?? Well, you should get the terminology correct. If you go to the previous page, this is "collision". > 2) Also just wanted to confirm that . All the CTS packets are > sent to all members in the Cell. > Correct?? I wouldn't say "send to". "Send to" sounds like the case that if you have N other nodes, you send N packets. These nodes are using wireless radios. One node puts out a signal. Any node that's in range can hear it. > 3)Can it be interpretted that the CTS packets are multicasted > ones?? Multicast is basically a mode of "addressing". It's more like broadcast for wireless. Only nodes within range can hear the broadcast. -- Bill Cheng // bill.cheng@usc.edu