# CIO values meaning

Hi Experts,
For CIO value is it correct?

• Negative value means late HO
• Positive value means early HO

Admin note: this post was updated with image below.

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Yes CIO correct and for dedicated mode only cell to Cell relation. Handover I mean.

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Yes, correct.

Yes - for late and + for early

Hi LTE Experts:

If CIO (Cell Individual Offset) configured 24 dB, then is it possible to use it with A5 event or not?
Or only possible with A3 event?

CIO should be applied to that neighbor relation irrespective of A3/A5 so must b applicable to both events, both event formula have cell specific offsets.
We have seen CIO benefits for A5 based HO relation also.

Thanks can you please explain little more.

• Threshold for serving = -112
• Threshold for target = -116

Here CIO = 24 dB
How will it work in Measurement Reporting for A5?

Offset alwas on neighbor measurement which is A5T2 here so -116 + 24 = - 140 dBm

In A3 to delay/reduce handover between a relation, we put negative CIO, in A5 we put positive CIO.

A5 also negative CIO will reduce HO, I meant towards positive I.e -116 - (-24) is -92 then ho will reduce.

I think here is correction:
Irrespective of HO type A3/A5, positive CIO always reduced HO margin.
And negative CIO always increase HO margin.

Here CIO = 24, means you are making NBR 24 dB stronger than actual value, so HO will be quicker.

Yes, correctđź‘ŤđźŹ».

It linked with early and later Handover type in LTE

Serving RSRP < -112 and NBR RSRP + 24 > -116

Hi, can someone explain how CIO value is affecting a3 meas reoprts?

Letâ€™s say A3 offset is 4 dB and CIO for a neighbor A is 8 in measConfig.

When UE will send A3 meas report for neighbor A?

CIO use to delay or early handover process.

Its value can be negative or positive.

How CIO works in Interfreq HO?

Is it applied to source or target?

• If CIO defined in meas object for serving cell then it will apply for intra freq neighbour only.
• If CIO defined in meas object for target frequency then it will apply for inter freq target cell.

Can be either.

Depends on configuration.

What basis CIO need to change +ve or -ve ?

Usually CIO parameter is used to load balancing.

Letâ€™s say cell A and cell B are neighbors.

Letâ€™s say cell A is 80% loaded and cell B is 10% load.

In this case cell A will have -ve CIO for cell B.

And Cell B will have +ve CIO towards Cell A.

This CIO values are given / managed by eson server where all cells register neighbor and reports load.

Hope it explain your query.

CIO value apply automatically according to early and late HO counter pegging in the network.