Ok, what if enb1 = c1 , and enb2 = c2.
Can they be serving same sector?
Is it allowed in real field deployment?
enb1 transmits c1 and enb2 also transmits c1 but in a diff timeframe/structure to ensure no interference.
Yes, no issues.
Earfcn is different anyway.
Yes, but adjacent carriers.
CF is different.
Is it done practically?
Does in field you see two enbs co-located and serving same sector?
GSM works similar, but different planning.
Yes.
Ok, thanks.
But there is no CA - c1+c2 in such case, right?
It’s optional.
But one question: what’s the reason for 2 enb for c1 & c2 for same cell? Merge in 1 enb if capacity available or reconfig to have 1 enb with c1, c2, 2nd enb with other technology?
It is to get answer to my original question…
I need to understand what impact time drift will cause between co-located cells.
I know TDD needs time sync, but what if same sector is having fdd + nr also, do all these cells in same sector need to be time aligned between each other.
It was just a theoretical question to understand how enbs are deployed in field…
Serving same sector means what?
Both eNB located at same location and both eNB antenna oriented towards same area?
Yes, exactly.
Ok, so it’s possible, both eNB is not capable of having more than 1 carrier?
Normally both carriers is served by single eNB, only if like like small cell solution capable of serving single carrier then can have 2 eNBs with different carriers serving same area.
Are there any deployments where you have seen more than one eNB at same location?
One eNB may be serving multiple carriers. So 2 eNB serving multiple carriers and same sector. And does CA works between those eNB?
What is the definition of enodeB here?
Are we referring to BB as enodeB?
If yes, multiple baseband can be installed in one particular site, and each BB can cater multiple carriers.
These separate BBs will have different enodebids. CA will be functional between the cross BB carriers.
- 1 physical location for macro network, is 1 eNB
- 1 eNB can have multiple baseband units
- 1 eNB can have multiple sectors and cells
- 1 cell is 1 carrier frequency on 1 sector
eNodeB I mean here is complete package including BB.
Thanks. Then it means a co-located site is simply multiple BB with a single eNB. It is never more than one eNB. Am I correct?
Depends what co-located mean. Co-located is generally used for 2G, 3G and 4G technologies being co-located on single site. In that case all sites have their own BBs and own Node IDs.
All technologies on co-located site have their own BBs traditionally. However in later releases I think Huawei BB could do all technologies.
OK. So a co-located site with cells in a sector from FDD B3, B7 + TDD B40 + NR n78 can be actually 2 eNBs - one for LTE and other for NR-NSA?
Or FDD B3 , B7 (enb1) + TDD B40 (enb2) + NR n78 (gnb) is also a possible case?
CA over X2 is possible if vendor support.
Unlikely to be separate eNBs.
But someone here might be able to comment better.