Re: Rank confusion in LTE
This has confused me in the past too. I believe (and will stand corrected because i never got a satisfactory answer to it) that you can get RI=1 more often when you enable TM4. But that doesn't mean slower throughout overall because DL noise is reduced significantly throughout the cell and particularly on the edge.
So as far as i understand it you can use RI=1 with TM4 and its not Tx Div....its supposed to be better than TxDiv... But i am struggling to understand how that can be(apart from the obvious.noise reduction). Im assuming its a similar case for 4*4....
Re: Rank confusion in LTE
Case 3: Rank3 & 4
We have a case where rank3 is reported more than Rank4...Any specific reasons?
in our network we deploy L26 +L18 4X4 , and using U11 to do the static test.
In most case UE report RI =3 . The only one test Result we got RI=4 is we block all neighbor site and UE SINR is above 25 [ In test Result L18 SINR is 30 and L26 SINR is 26 ].
So i guess if you want to see RI=4 , the RF condition must very very good
Re: Rank confusion in LTE
Hi BlackX,
Yes, Convincing! I have a related query, when Rank is 3 as reported by RI, how many antennas does eNB & Ue use for this communication? Will both use all 4 Antenna ports or Only 3 antenna ports will be used and the 4th port is unused?
Quote:
Originally Posted by
BlackX
Case 3: Rank3 & 4
We have a case where rank3 is reported more than Rank4...Any specific reasons?
in our network we deploy L26 +L18 4X4 , and using U11 to do the static test.
In most case UE report RI =3 . The only one test Result we got RI=4 is we block all neighbor site and UE SINR is above 25 [ In test Result L18 SINR is 30 and L26 SINR is 26 ].
So i guess if you want to see RI=4 , the RF condition must very very good
Re: Rank confusion in LTE
actually i not sure, i think this is depend on vendor's hardware and scheduler design
2 Attachment(s)
Re: Rank confusion in LTE
Attachment 41457
This is a snap from XCAL MO PDSCH demapper Config.
Here M & N are given as Tx & Rx antennas, but not sure how it is calculated
Re: Rank confusion in LTE
The enb has the flexibility of using either 3 individual antenna ports or combining 2 ports into 1 in addition to the remaining 2. the second option is a combination of transmit diversity and the MIMO. But either depends on the RF condition of the UE.