请教一个802.11的问题 - 未名空间MITBBS历史存档

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请教一个802.11的问题

请教一个802.11的问题# EE - 电子工程

w*t2008-09-28 07:09

1 楼

如果两个竞争的station，再运行CSMA/CA之后恰好同时传输数据，这个时候信道会有
collision。对于任何一个sta而言，这个collision是马上能够被sense，还是说要等到
整个数据包传输完成之后没有收到ACK之后才能确认数据包collision。

B*42008-09-28 07:09

2 楼

One of the problems of wireless LANs is that it is not possible to listen
while sending, therefore collision detection is not possible.
So when one station starts transmitting, it cannot detect the collision. It
has to wait until the transmission is finished detect the collision.

z*n2008-09-28 07:09

3 楼

if it is CSMA/CA, the whole frame will be sent out for
both stations.
CSMA/CA doesn't have collision detection function.

【在 w******t 的大作中提到】

: 如果两个竞争的station，再运行CSMA/CA之后恰好同时传输数据，这个时候信道会有
: collision。对于任何一个sta而言，这个collision是马上能够被sense，还是说要等到
: 整个数据包传输完成之后没有收到ACK之后才能确认数据包collision。

z*n2008-09-28 07:09

4 楼

It
^^^^^^^^^^^^^^^^^^^^^
this term is wrong. The sending station will wait for ACK and
if it doesn't come, then it assumes that a collision has happened..:-)

【在 B********4 的大作中提到】

: One of the problems of wireless LANs is that it is not possible to listen
: while sending, therefore collision detection is not possible.
: So when one station starts transmitting, it cannot detect the collision. It
: has to wait until the transmission is finished detect the collision.