Can eNodeB know the velocity of UEs?

[이현중]

I want to propose a new scheduling algorithm based on the velocity of UEs. So I just want to know if there is any way to get velocity of UEs in LTE system. Please anybody answer for this question.

I will be very appreciated. Thank you!

[Konstantinos]

Hi,

Where do you want to get the velocity? Since the scheduling algorithm run on the eNB, this node has to know the velocities of UEs.

In a realistic system, in order to do that, each UE should send their velocity to eNB through the signalling channels. 

Now, in order for each individual UE to get its own velocity information... just search the mailing list. It is discussed numerous times. Get a pointer to the mobility model for the node and from that you can get the velocity.

[이현중]

Thank you for your reply.

I want to know is that my assumption (eNodeB knows the velocity of serving UEs) is realistic or not. Do you have any other opinion?

2014년 9월 25일 목요일 오후 8시 3분 14초 UTC+9, Konstantinos 님의 말:

[Konstantinos]

In order for the eNB to know the position/velocity of the UEs, someone has to tell it.

You could do that either by sending this information periodically to the MME (by extending its functionality) and then have each eNB ask the MME for it.
I mention here the MME since it is the entity responsible for mobility management. 

You could also infer its position/velocity by triangulation and signal processing among eNBs, but that is not accurate and adds a lot of complexity.

So, your assumption could be valid/realistic but you would have to evaluate what is its overhead/gain. You might have better scheduling but the increase in signalling could deteriorate the performance.

[Nicola Baldo]

See this previous thread, the exact same question was already discussed
https://groups.google.com/d/msg/ns-3-users/yxn28ml1BJg/t_BitTj-APQJ