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the proxies, which places extra computational demands on these forwarding nodes. This latter requirement may place a strain on the (already limited) power reserves of mobile devices. Disabling RTS/CTS for Short Segments. In the 802.11 protocol, the exchange of unicast messages is conducted at the link layer, rst with an RTS/CTS handshake and then with a DATA-ACK exchange [4]. The Request to Send/Clear to Send (RTS/CTS) exchange is a bilateral point-to-point transmission between successive nodes along a path to reserve the space around the nodes, avoiding the hidden and exposed terminal effects [4]. The DATA/ACK exchange at the link layer is an attempt to ensure reliable delivery of DATA on a point-to-point basis, although there is a limit to such efforts before the link layer gives up and drops the frame 2 ; speci cally up to four retries for DATA and seven times for RTS frames are attempted.3 Figure 10.11 illustrates the principles of the RTS/CTS exchange. In Figure 10.11a the source and destination nodes communicate by a simple DATA/ACK exchange, as denoted by instances 1 and 2. The source node senses the channel to determine if there are ongoing transmissions, in which case it defers its own until such time as there are no more transmissions occurring. Assuming similar transceivers and signal propagation conditions, the source can only be certain that there are no transmissions within its sensing range (the reserved area denoted by the shaded section in Figure 10.11a). However, nodes transmitting within the nonreserved area may interfere with the source s signal because they have no means of detecting the source s transmission and thus will not defer in turn. The RTS/CTS exchange solves this issue as shown in Figure 10.11b. The usual DATA/ACK transmissions in instances 3 and 4, respectively, are preceded by an RTS

term frame is employed here when discussing issues related to Link/MAC layer messages as per IEEE practice [4]. number of retries for segment retransmission are de ned by the dot11ShortRetryLimit and dot11LongRetryLimit variables in the IEEE 802.11 speci cation.

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Not at all, Mr Banes, the other answered We re just here manning some open positions This one spoke forcefully with a British accent His voice had a tone of confidence, and this impressed me I wanted to speak like that I wanted to be sure of myself like that, especially when trading Confidence seemed to play a big role in trading success After making a mental note to ask Craig or Anderson or Harvey about it, I asked: Is there any reason that switching from a four-hour chart to a daily chart would make a big difference As long as I am following the same system The Brit didn t even look up He shook his head I think he took me for an amateur (which I could not dispute) and didn t seem to care one way or the other if I got my answer.

The AACR encountering Gamla Stan for the rst time may access as a priori SKO with landmarks, street names, the authority of the information, constraints on spatial relationships, and other characteristics that help relate its experience to features of the location This section identi es the important constraints to the information landscape that must be known in order to enable well-grounded aggregation of experience for use of that landscape 8731 Constraining the Source The source of the knowledge about Gamla Stan is not explicit in Expression 8-20, but in order for an AACR to reason about con icting information, it must associate a source with each KO For example, the AACR might learn that there are no public WLAN access points from the following source: <Source> <Place> Fairfax, VA </Place> <Time> 199905121605 </Time> <Author> J.

Figure 10.11. Illustrating communications with the plain and RTS/CTS transmissions scheme. (a) Plain DATA/ACK exchange does not reserve the whole space around the transmitter and receiver. (b) RTS/CTS followed by a DATA/ACK exchange reserves more space around the communicating nodes.

Mitola III <Author/> </Source> Some might trust this source, while others might want a more current, more authoritative source If another source says that there are indeed public WLAN access points on Gamla Stan, dated 200501041610, then which would you trust Suppose another source later says that there are none because the network is down Yet another source said ve minutes ago that the WLANs are all up Now which one do you trust Reasoning over such con icts requires the codi cation of the idea that the most recent relevant experience is the one to be most trusted This idea isn t hard to implement computationally, so there is a SDH, advising that the most recent status report be believed:.

probe from the source which is accompanied by a CTS response from the destination. The RTS frame informs nodes within the source s transmission range that a DATA frame will follow as a transmission, while the CTS response informs nodes within the destination s transmission radius that they should withhold transmission so as not to interfere with the reception of the DATA frame from the source. The RTS and CTS frames are very small in size so as to reduce the overhead of this preamble to the real transmission. If a CTS response is not forthcoming from the destination, the source can then surmise that the destination did not receive its RTS because another transmission near the destination has interfered with its signal. Hence, the source defers its transmission to a later time. Details of this exchange in the context of the 802.11 protocol may be found in reference 4. However, previous research has revealed that enabling the RTS/CTS exchange may in fact reduce throughput and lead to unfairness if the source and destination nodes are suf ciently far apart [50]. The identifying cause for this effect is the discrepancy between a transceiver s transmission and interference ranges. Readers interested in more details should consult references 50 and 51. It should also be observed that eliminating the RTS/CTS exchange altogether is not an optimal solution because it allows for hidden and exposed terminal effects to occur, thus leading to frequent frame collisions [4].

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