Talk:Hidden node problem: Difference between revisions
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Section "Use Omnidirectional Antennas:" The advice to use omnidirectional antennas is not good in all cases. Directional antennas by nature reduce the interference potential of transmitters and increase selectivity of receivers. If the hidden nodes are not sending traffic to the same receiver (requires a minimum four-node network example), directional antennas can be a key component of frequency reuse inside a network. Also, in the case where an access point IS the recipient of two hidden nodes' data streams, two directional antennas in spatial diversity mode will greatly increase the odds that at least one of the two colliding transmissions will be correctly received (since the receiver will choose one antenna and recieve the transmission on that antenna without interference, requiring the retransmission of just one packet from the hidden node that "lost." [[User:63.164.202.130|63.164.202.130]] 13:18, 13 April 2007 (UTC) |
Section "Use Omnidirectional Antennas:" The advice to use omnidirectional antennas is not good in all cases. Directional antennas by nature reduce the interference potential of transmitters and increase selectivity of receivers. If the hidden nodes are not sending traffic to the same receiver (requires a minimum four-node network example), directional antennas can be a key component of frequency reuse inside a network. Also, in the case where an access point IS the recipient of two hidden nodes' data streams, two directional antennas in spatial diversity mode will greatly increase the odds that at least one of the two colliding transmissions will be correctly received (since the receiver will choose one antenna and recieve the transmission on that antenna without interference, requiring the retransmission of just one packet from the hidden node that "lost." [[User:63.164.202.130|63.164.202.130]] 13:18, 13 April 2007 (UTC) |
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==I do not understand the problem== |
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After reading this article, I still do not understand '''why''' there is a problem when the nodes can't see each other - the nodes are communicating ''with the hub'', not directly with each other, aren't they? Even if node A wants to send data to node B, that data goes (as far as I have understood computer networks) through the hub, so why is there a problem when A and B can't see each other? |
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The article should be edited to clarify this, by someone who knows the answer. |
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[[User:Cybotoro|Cybotoro]] 13:42, 17 August 2007 (UTC) |
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Revision as of 13:42, 17 August 2007
Section "Background": What are "adaptive acknowledgements"? NotInventedHere 12:47, 27 May 2006 (UTC)
Section "Use Omnidirectional Antennas:" The advice to use omnidirectional antennas is not good in all cases. Directional antennas by nature reduce the interference potential of transmitters and increase selectivity of receivers. If the hidden nodes are not sending traffic to the same receiver (requires a minimum four-node network example), directional antennas can be a key component of frequency reuse inside a network. Also, in the case where an access point IS the recipient of two hidden nodes' data streams, two directional antennas in spatial diversity mode will greatly increase the odds that at least one of the two colliding transmissions will be correctly received (since the receiver will choose one antenna and recieve the transmission on that antenna without interference, requiring the retransmission of just one packet from the hidden node that "lost." 63.164.202.130 13:18, 13 April 2007 (UTC)
I do not understand the problem
After reading this article, I still do not understand why there is a problem when the nodes can't see each other - the nodes are communicating with the hub, not directly with each other, aren't they? Even if node A wants to send data to node B, that data goes (as far as I have understood computer networks) through the hub, so why is there a problem when A and B can't see each other?
The article should be edited to clarify this, by someone who knows the answer. Cybotoro 13:42, 17 August 2007 (UTC)