英语翻译C1

c. MAC Pmtocols
Wireless channels are broadcast channels in nature. When
multiple transmitter/receiver pairs share a single channel,
we need a MAC protocol that determines which user gets to
use the channel. Time is slotted and we assume no spatial
reuse. Thus a collision occurs when more than one user
transmits over the channel in a given time slot.
Many MAC protocols are known. A traditional way
of allocating a single channel among competing users is
“Polling”. This can he realized in a token ring network
where all the users are connected in a ring architecture. A
token is circulated among all the users who have packets to
transmit and a user can only transmit if it seizes the token.
Polling guarantees no collision and the channel is in use
as long as there are packets that need to be sent. TDMA
(Time Division Multiple Access) is also a collision-free
multiple access scheme. In TDMA, time slots are assign

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