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2kbps - (Answer)

The document discusses a wireless computer networks problem regarding the stand-alone dedicated control channel that uses four time slots per 51-control multiframe. It provides the solution that the effective data rate of this logical channel is approximately 2kbps.

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61 views1 page

2kbps - (Answer)

The document discusses a wireless computer networks problem regarding the stand-alone dedicated control channel that uses four time slots per 51-control multiframe. It provides the solution that the effective data rate of this logical channel is approximately 2kbps.

Uploaded by

kanny
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Keyur Upadhyay (09CP15)

Wireless Computer Networks (WCN)

M. E. Computer (1st Semester)

Submitted by: Keyur Upadhyay (09CP15)

From Kavesh Pahelvan

---------------------------------------------------------------------------------------

Problem 7.3:

The stand-alone dedicated control channel (SDCCH) uses four time slots per each 51-
control multiframe shown in figure 7.14 .Use the super frame timing to determine the
effective data rate of the logical channel.

Solution:

From figure 7.14

 GSM frame either comprises of 26 traffic channel frame or 51 control frames.

 SDDCH (stand-alone dedicated control channel) is two way channel; it uses four time slots per
each 51 control multiframe

As we know that GSM multiframe of 51 control frames takes 235.4 ms with 8 time slots or bursts
per frame, so for four slots it takes 117.7 ms

Effective Data Rate of this logical channel is given by:

= 114 bits (information bits)/117.7 ms * 2(double than the traffic channel)

= 0.969 *2 kbps

= 1.938 kbps

~=2kbps-------------------------------------------------------------------- (Answer)

Also this is given in book that the physical channel for SDCCH occupies four slots in every 51 control
multi frames with an approximated gross data rate of 2 kbps per terminal.

M.E CP

2009-10

WCN

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