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UE that can be allocated DL (one TTI) when using LTE

+2 votes

what is the limitation in terms of number of UE that can be allocated RB in one TTI/subframe in DL?

Is there any limit defined by the standard? Or would it be possible for instance that 50 UEs would have 1 RB each (for an overall 50 RB BW)?

posted Jul 22, 2013 by Nora Jones

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1 Answer

+3 votes

As i know 50 resource blocks are available for every Transmission Travel Time (TTI) i.e. 1 ms. So in one millisecond if E-NodeB has resources and each UE has 1 RB, it can maximum serve 50 UE's in one TTI.

Theoretically it is the possible but in practical aspects it is very difficult to serve 50 users in one subframe/TTI. To find out this much excellent scheduler is hard.

I feel the limitation of UE also depends upon (Physical Downlink Control Channel) PDCCH capacity. If this channel has enough Control Elements (CCE) and radio bearers are available, E-nodeB can handle those many UE's in one TTI.

answer Apr 11, 2014 by Hiteshwar Thakur
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+4 votes

As we know, maximum number of CCEs can be 100. If suppose number of CCEs are 10 in 10MHz bandwidth and CFI=1.
So my query is that : with CCEs=10, only 10 users are possible to be allocate? How many users can be allocated maximally in one subframe? What is the best possible way of scheduling of users.