Best layering strategy for 3G network with 3 frequencies

[yassanino]

Hi all experts,
can any one explain us how to set optimal strategy for 3G network having 3 frequencies : f1 , f2 and 900 Mh is the 3rd.
knowing that we prefer f1 for CS mainly F2 is set for taking traffic from f1 with ifho for PS ( F2 barred ) .



Many thanks

[tharinduwije]

Your strategy seem to be ok.Is 3rd carrier given priority for PS or both PS & CS? For our network we have scenario like below,

1st Carrier Service Priority for CS (To enhance EC/Io since HSDPA power pollution is avoided/DRD with Service Priority)/IFHO Neighboring is from same cell F1-->F2 only,F1-F1 & F2-F2 is bidirectional with neighboring sites
2nd Carrier Service Priority for PS (Idle mode Access barred ,High HS codes)
3rd Carrier Service Priority for PS (Idle mode Access barred ,High HS codes), IFHO Neighboring is from same cell F1-->F3 & F2-->F3 only

[rumy]

"knowing that we prefer f1 for CS mainly F2 is set for taking traffic from f1 with ifho for PS ( F2 barred ) ."

U're saying F2 is only for PS?? What about MultiRab calls, are those handled by F1 also?

In my network we have 3layers in U2100 and 1 in U900.
Our startegy for U2100 is to keep voice on F1 and PS for F2,F3. Each time a mobile makes an HS call it goes in F2 or F3 and when it finishes the session it idles there. Once a voice call si made, we set the IFHO thresholds for Voice so that if EcNo is worse that -1dB it goes to F1...in other words, everytime UE will go back to F1 for Voice.

[yassanino]

"knowing that we prefer f1 for CS mainly F2 is set for taking traffic from f1 with ifho for PS ( F2 barred ) ."

U're saying F2 is only for PS?? What about MultiRab calls, are those handled by F1 also?

In my network we have 3layers in U2100 and 1 in U900.
Our startegy for U2100 is to keep voice on F1 and PS for F2,F3. Each time a mobile makes an HS call it goes in F2 or F3 and when it finishes the session it idles there. Once a voice call si made, we set the IFHO thresholds for Voice so that if EcNo is worse that -1dB it goes to F1...in other words, everytime UE will go back to F1 for Voice.
IFHo with -1db in ECNO => F1, and if F1 is overloaded in voice did you make scenario for load control ?

[justdream]

Dears, do you have Document about recommended 3G 3-carriers strategy

[webkasperl]

traffic segmentation is nice if you have lots of capacity and want to have low cell breathing for speech calls, but having one carrier for speech only means some waste of capacity.
by the way: speech is most of the time multi-service due to the extremely high smartphone penetration
;)

[khurrambilal01]

The best way to handle traffic and balance the network layers + Benefit the most out of U900 as well is that:
1. F1/F2 Load balanced enabled; CS/PS calls enabled on both carriers
2. U900 - F3 can only be reselected if F1/F2 coverage is weak, F3 can carry Voice Calls + PS calls.
3. F3 PS users have measurement LDR enabled to shift some users to F1/F2 if F3 has high traffic

Using this strategy you can gain more CS/PS traffic, keep balance between all three carriers and with reasonable KPIs.

[qaqa]

hi guys,
the best strategy will be free camping between different channels. the UEs will select the target channel based on the load. this will lead to a very balanced netwrok.
But because your 3 channels are not on the same band, I guess, you should tweak your selection/reselction parameters between diff channels based on the expected pathloss to create that balance.
you would like to avoid DRD (RRC or RAB) and also avoiding IFHO during access (compressed mode). the worst strategy would be to assign a whole channel to one service like CS. this is a very inefficient way in designing your network. MultiRAB is a good example why this strategy is no more valid.
also think about Dual carrier as you want to serve your customer with the highest possible throughput.

[electron]

Hi,


qaqa gave the best answer among others. Shorten and comprehensive. great


Cheers
hi guys,
the best strategy will be free camping between different channels. the UEs will select the target channel based on the load. this will lead to a very balanced netwrok.
But because your 3 channels are not on the same band, I guess, you should tweak your selection/reselction parameters between diff channels based on the expected pathloss to create that balance.
you would like to avoid DRD (RRC or RAB) and also avoiding IFHO during access (compressed mode). the worst strategy would be to assign a whole channel to one service like CS. this is a very inefficient way in designing your network. MultiRAB is a good example why this strategy is no more valid.
also think about Dual carrier as you want to serve your customer with the highest possible throughput.

[partizanen72rus]

Hi, how to prevent camping in idle mode to f3?

[Boraa]

The best strategy depends on the call Profile of the Network :
for example if the call profile is PS , you can load balance the traffic among the three carriers to max. the throughput

[partizanen72rus]

Do you mean Service priority group? Or user profile in HLR? I used to experiment with SPG a lot, but with a poor result... I use R13 equipment.

[tharinduwije]

Hi,


qaqa gave the best answer among others. Shorten and comprehensive. great


Cheers

We used this method for awhile but had bad Ec/Io issues due to HSDPA power pollution.Do guys have any recommendations on how to tweak HSDPA dongle co-existing with CS traffic in the same carrier? In DRD at least most of the CS Traffic is residing on Good Ec/Io Levels for initial RAB assignment.