March 2006
Beginner
216 pages
6h 56m
English
Content preview from Cellular Communications Explained
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7. Physical Common Packet Channel (PCPCH), mapped to CPCH. As might be gathered
from its name, this channel is specifically intended to carry packet data. In operation,
the UE monitors the system to check whether it is busy; if not, it transmits a brief access
burst. This is retransmitted if no acknowledgement is gained, with a slight increase in
power each time. Once the node B acknowledges the request, the data are transmitted on
the channel.
8. Synchronization Channel (SCH). The synchronization channel is used in allowing UEs to
synchronize with the network as described above.
9. Common Pilot Channe l (CPICH). This channel is transmitted by every node B so that the UEs
are able estimate the timing for signal demodulation. Additionally, it can
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