top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

During a call, at a particular instance of time if sufficient PRBs are not available then what will happen to the call?

0 votes
469 views

During a call, at a particular instance of time if sufficient PRBs are not available then what will happen to the call? Will the call be dropped?

posted Apr 25, 2018 by anonymous

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

+3 votes

If PRB is not available in particular TTI call Transport Block can be scheduled in the next one available. If DRX is used than next occasion would be after 20 or 40 TTIs usually. In case Transport Block cannot be delivered within predefined time ( normally 80-100 ms) than priority of such user should be increased in scheduler. The pervious TB is lost and next one is going to be scheduled. If we face still problems to allocate TB because there is no PRBs in DL available , inactivity tier might expire and RB is released. But normally admission control takes care to prevent such situation and secondly to get PDSCH congested is difficult as at first point PDCCH congestion should occur before PDSCH.

answer Apr 25, 2018 by Djordje Begenisic
Excellent answer!
Standard is designed to guarantee PDCCH congestion occur before PDSCH.
commented May 7, 2018 by Lin Lee
Similar Questions
+2 votes
In LTE, the transport block size does not depend on the CFI, so if the CFI is changed, what will happen?

In LTE, the transport block size is a mapping of the CQI, MCS and the allocated PRB and does not depend on the CFI. So for the same TBSize (which means same CQI, MCS, allocated PRB), if the CFI is changed (as in case of dynamic CFI) what will happen? is the code rate will be increased or decreased?

...