Maximum number of defined neighbours per LTE cell

[esoestemp]

Hi experts,
I need a help concerning the question in the title - it is about ERAN8.1/SRAN10.
I found in HUAWEI documentation some explanations, but look at them below:

"The eNodeB preferentially selects and delivers neighboring cells whose Cell Measure Priorityis set to HIGH_PRIORITY(High Priority). If the configured number of neighboring cells exceeds the upper limit defined in 3GPP specifications and multiple neighboring cells are configured with the same priority, the eNodeB randomly selects some neighboring cells for delivery"

LTE_NBs.png


From this I can understand we can define times more than 3GPP limitations, but the delivered amount to UE is the 3GPP restriction.

What do you think?
Is there any difference between Idle and Connected mode?

[wolverine]

Not sure where Huawei are coming from regarding the intra frequency case.

According to 3GPP 36.113

8.1.2.2 E-UTRAN intra frequency measurements
The UE shall be able to identify new intra-frequency cells and perform RSRP measurements of identified intrafrequency
cells without an explicit intra-frequency neighbour cell list containing physical layer cell identities. During
the RRC_CONNECTED state the UE shall continuously measure identified intra frequency cells and additionally
search for and identify new intra frequency cells.

So according to the above the eNodeB does not need to send any neighbour lists to the UE. As such I don't understand what they are talking about. Unless someone is getting confused with 3G.

[esoestemp]

Hi wolverine,

How about LTE ->UTRAN.
Is that value 32 per UTRAN frequency or the total limitation.

[qaqa]

@Wolverine,
the measurement is indeed performed by the UE with no control from the eNode. The HO though is a pure eNOdeB process, so what HUawei means with "delivery" is the selection of the target cell for which HO to be performed. If this cell is not defined as a neighbour, i..e, no X2, either S1 based HO will happen or the call will drop.

blame it on the weird chinese --> English translation methodology that Huawei uses to create English documentation :-)

[linhhy]

@Wolverine,
the measurement is indeed performed by the UE with no control from the eNode.

I think UE performs the measurement based on "RRC connection reconfiguration message" that control from eNodeB.