3g optimization help-GSM concepts (Rep and thanks)

[beniy]

Hi Dears,
I am gsm-GPRS optimizer
I have some question about 3g.

I will push Rep and Thanks for any answer.


In GSM we have TRX -for example one Cell have 4 TRXs
every TRX has 8 timeslot (Channel) which can be BCCH,SDCCH,TCH,PDTCH
CS and PS channel are seprated.According to the PS or CS priority we can assign traffic channel for them.


in normal 2 Static PDTCH is enough for one cell with 4 TRX
we have dynamic PDTCH for time which we have high traffic
the rest of traffic channels assign to CS.
8927


How are these in 3g network?

TRX....policy and concept
channell.
PS and CS ............policy for assignment channelss
and.....

[beniy]

????
please help

[paboya]

On 3G there some items that must be considered on Dimensioning Node-B


1. CE (Chanelization Element )
Each Node-B have limitation on CE Capacity, depend on Core Module of node-B and the license that u buy
Each Voice need 1 CE
Packet UMTS Rel 3 (depend of QOS )
HSDPA need 32 CE + Number of HSDPA User (1 CE per user)


2. IuB Capacity (Transport)
it become consideration on dimensioning
Although u buy much CE, u must look the IuB Capacity also
More license more acces and more capacity of transport




Hi Dears,
I am gsm-GPRS optimizer
I have some question about 3g.

I will push Rep and Thanks for any answer.


In GSM we have TRX -for example one Cell have 4 TRXs
every TRX has 8 timeslot (Channel) which can be BCCH,SDCCH,TCH,PDTCH
CS and PS channel are seprated.According to the PS or CS priority we can assign traffic channel for them.


in normal 2 Static PDTCH is enough for one cell with 4 TRX
we have dynamic PDTCH for time which we have high traffic
the rest of traffic channels assign to CS.
8927


How are these in 3g network?

TRX....policy and concept
channell.
PS and CS ............policy for assignment channelss
and.....

[beniy]

On 3G there some items that must be considered on Dimensioning Node-B


1. CE (Chanelization Element )
Each Node-B have limitation on CE Capacity, depend on Core Module of node-B and the license that u buy
Each Voice need 1 CE
Packet UMTS Rel 3 (depend of QOS )
HSDPA need 32 CE + Number of HSDPA User (1 CE per user)


2. IuB Capacity (Transport)
it become consideration on dimensioning
Although u buy much CE, u must look the IuB Capacity also
More license more acces and more capacity of transport

Dear Paboya..

could you more explain??

I didn't get about channels assignment and trx?
please prepare example or picture!
Thanks

[paboya]

Each 3G Site, generally just equipped with one RF Module per cell (prefer on NSN and Huawei Equipment) where can handle one or two frequency

[beniy]

Each 3G Site, generally just equipped with one RF Module per cell (prefer on NSN and Huawei Equipment) where can handle one or two frequency

How about channel assignment and policy for PS and CS? in 3g

[beniy]

How about channel assignment and policy for PS and CS? in 3g
Please share your documents
thanks

[beniy]

Please share your documents
thanks

Dears any answers or feedback??

[beniy]

Dears any answers or feedback??


Any 3g optimizer which can help me???
Realy we have not somebody as a 3g optimizer??:o

[gprastomo]

How about channel assignment and policy for PS and CS? in 3g

Hello,

Channel Assignment PS&CS :
1. CH assignment in PS Call
- From signalling point of view it will ask for RRC Request cause PS IB (Interactive Background) -> This signalling RRC usually ocupy SF 256 with 8 kbps, depends on SRB set on RNC database and it will ocupy 1 CE (Channel Element) as described above but usually small MHT (very fast).
- Then it will ask for RAB service, then the Core will give the RAB.
- Usually the bit rate will dynamically adjusted depends on the troughput, DL power, buffer occupancy. Usually the bit rate of PS will vary from PS 64, PS 128 and PS 384 depends on above parameter.
Each of those bit rate will ocupy different resource and power, let say PS 64 will need SF 32, and 4 CE, and max power 32 dBm and min power 15-17 dBm (depends on database and dimensioning rule) and it will ocupy UBR around 70-80 kbps on IuB (im not sure about IuB, you can ask TRS planner). Then after the Flexible Upgrade or Throughput Based Optimization and Dynamic Link Optimization, all those resource will change according to the bit rate.
2. CH assignment in CS call,
This one almost the same with PS but, this CS is not best effort, it must reserved the resource on IuB and CE and cant be modified. The RRC signalling is the same with PS but the cause will be conversational (the same for video/ CS 64 and voice / CS 12.2).
It will reserve the CE on BTS 1 CE SF 128 for amr and 4 CE SF 32 for CS64 and on IuB will be 16-24 kbps CBR. and max power will around 31 dBm - 15 dBm depends on planner.

Some of those parameter is vendor specific and planner specific, so might be different with other vendor or planner.

[kamy]

I'm not sure whether this enclosed doc can help you or not.
At the end of this doc, there are some clues by case studies for traffic planning and CE calculation principles.
Hope this can help you a bit.
BRs
kamy

[beniy]

Hello,

Channel Assignment PS&CS :
1. CH assignment in PS Call
- From signalling point of view it will ask for RRC Request cause PS IB (Interactive Background) -> This signalling RRC usually ocupy SF 256 with 8 kbps, depends on SRB set on RNC database and it will ocupy 1 CE (Channel Element) as described above but usually small MHT (very fast).
- Then it will ask for RAB service, then the Core will give the RAB.
- Usually the bit rate will dynamically adjusted depends on the troughput, DL power, buffer occupancy. Usually the bit rate of PS will vary from PS 64, PS 128 and PS 384 depends on above parameter.
Each of those bit rate will ocupy different resource and power, let say PS 64 will need SF 32, and 4 CE, and max power 32 dBm and min power 15-17 dBm (depends on database and dimensioning rule) and it will ocupy UBR around 70-80 kbps on IuB (im not sure about IuB, you can ask TRS planner). Then after the Flexible Upgrade or Throughput Based Optimization and Dynamic Link Optimization, all those resource will change according to the bit rate.
2. CH assignment in CS call,
This one almost the same with PS but, this CS is not best effort, it must reserved the resource on IuB and CE and cant be modified. The RRC signalling is the same with PS but the cause will be conversational (the same for video/ CS 64 and voice / CS 12.2).
It will reserve the CE on BTS 1 CE SF 128 for amr and 4 CE SF 32 for CS64 and on IuB will be 16-24 kbps CBR. and max power will around 31 dBm - 15 dBm depends on planner.

Some of those parameter is vendor specific and planner specific, so might be different with other vendor or planner.

Dears,
How many kind of channel in 3g we have?
(For example in gsm: bcch,sdcch,TCH,PDTCH)
please name like above

Are they Fix or Dynamic?(for example dynamic PDTCH is TCHF which can convert to PDTCH in gsm)

[beniy]

Dears,
How many frequency or carrier one site can haave????

[gprastomo]

Hello,

For the Physical Channel DL in 3G, it has :
1. Primary CCPCH which map to transport channel as BCH
2. Secondary CCPCH which map to transport channel as PCH and FACH
3. HS PDSCH for HSDPA which map to transport channel as HS DSCH
4. DPDCH and DPCCH to DCH

No physical channel differentiation between CS Call and PS Call. for User plane, both use DCH, and in DCH it self there are DCH 16 kbps, DCH 32 kbps, DCH 64 kbps, 128 kbps and DCH 384 kbps and all of them use specific SF. Example : CS 64 use DCH 64 kbps, so in PS Call PS 64 we can use DCH 64 kbps (no change in the name).
I cant say there is dynamic or not in 3G. But everithing is calculated dynamically based on resource available (CE, IuB, SF and power). For HSDPA usually it is reserved, let say we activate 3.2 Mbps, so the CC(16,16) till CC(16,12) (5 code SF 16, on the left one) will be reserved for HSDPA and it will scheduled to all active HSDPA users.

Regarding the number of carrier:
Initially the planner plan 1 carrier network for all sites and its capacity is already high than GSM. And if the capacity already so high so the operator can upgrade the 2nd carrier and make strategy, ex : HSDPA layering strategy, F1 for CS&R99 and F2 for HSDPA or choose another strategy.
1For all sites, we use the same UARFCN, to make differentiation between each sector or site, there is Scrambling Code and in 1 sector, to make differentiation between service, there is Chanelization Code.
So far i only meet 2 carrier, 3 carrier may possible.