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UU_HandoffOK Event in Actix

- By : Gustav Hoffmann / Krishna Kumar

- Date : 30/05/2012

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Summary

This aims to explain the UU_HandoffOK event in Actix w.r.tActiveSetUpdates and Soft Handover (SHO)..

In 3G the UE can be in Soft Handover (SHO) state with maximum 3SC coming from 3 different cells this state is called Soft Handover(SHO).

SHO is achieved by adding, removing or replacing cells followingthe network defined criteria set in the RNC.

These events are 1a (cell addition) ,1b (cell removal), and 1c (cellreplacement).

This handoff is event triggered, event 1a, 1b & 1c and these arereported immediately when they appear

The handover-related event: Handoff OK is incremented when the

following messages occur: ActiveSetUpdate message (Uu_RRC_MsgType == ActiveSetUpdate)

ActiveSetUpdateComplete message (Uu_RRC_MsgType == ActiveSetUpdateComplete)

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Actix Uu_HandoffOK event

From the pic you can see e.g.

1(175) 15.5% up to 4(6) 0.5% etc. This means in case of 1(175) 15.5% that

there were 175 events of Uu_HandoffOK event = 1, which meansthat 175 Activesetupdate completes occurred during the drive. Thiscould be additions, removals or replacements (1a,1b,1c).

For 4(6) 0.5% this means that there were 6 samples whereUu_handoverOk event = 4. This means that at 1 binned sample wehave 4 handovers occurring 6 times, so in total 4x6 = 24 handoversoccurred but 6 of them had 4 handovers occurring in 1 binnedsample e.g. 1000ms timebinning .

If you change the binning then the binned samples also change andthen the distribution of events in the legend changes. See below.

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Actix Uu_HandoffOK event Time binning (1000ms)

Here we have 447 Handover events.

1*175 + 2*97 + 3*18 + 4*6 = 447

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Actix Uu_HandoffOK event Location binning (15mx15m)

Here we still have 447 Handover events.

1*227 + 2*59 +3*17 + 4*2 + 5*1 + 6*1 +

9*1 + 23*1 = 447

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Actix Uu_HandoffOK event L3 message

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Actix Uu_HandoffOK event L3 message - addition

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Actix Uu_HandoffOK event L3 message - Removal

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Actix Uu_HandoffOK event L3 message - replacement

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