C1 and C2 value

[radio_network]

We are using Dual band with 900 as Pimary band (BCCH only at 900) and 1800 for traffi.c. Is it possible to use C2 value to change preference for call latching and to set the boundary

[santosjj]

Please find attached a document showing a dual band strategy.
Enjoy.

[hassen]

We are using Dual band with 900 as Pimary band (BCCH only at 900) and 1800 for traffi.c. Is it possible to use C2 value to change preference for call latching and to set the boundary

yes

C2=C1 + CRO for PT=/=31
C2=C1 - CRO for PT=31
and define cell 1800 layer 1

[ghassen]

We are using Dual band with 900 as Pimary band (BCCH only at 900) and 1800 for traffi.c. Is it possible to use C2 value to change preference for call latching and to set the boundary

C1 is cell reselection creteria in a network without hierarchical cell structure but C2 is a cell reselection criterion in a network with hierarchical cell structure.

What does it mean ???

It means that :

The mobile will take 5 measurement and wil average them:

Av_rxlev = (Rxlev1+Rxlev2+Rxlev3+Rxlev4+Rxlev5)/5

C1 = Av_rxlev-Rx_lev_acess_min-MAX(MS_TX_PWR_MAX-P,0) this how to calculate the cel reselection creterion

Rx_lev_acess_min : is the minimum received level by the mobile to access the bts

MS_TX_PWR_MAX : maximum power trransmitted by the mobile station

p : mobile power class

And it must be C1(neibourg cell) > C1( serving cell) to allow the mobile reselect a cell

For the celle reselection creterion 2 :

During Penality time

C2 = C1 + CRO - TFO

After penality time

C2 = C1 + CRO

For penality time = 31

C2 = C1 - CRO
where :

TFO : Temporary offset
CRO : Cell reselectio offset

A negative CRO will reduce the priority of the cell a positif one will increase the priority of the cell it means that with a positif CRO we add more difficulty to the mobile station to access the BTS

When a mobile reach the coverage area of neighbour cell given by C1 this cell will be excluded during penality time

And then the BTS will calculate now the speed of the mobile but how ??

++ If the mobile leave the coverage area of the serving cell before penality time is reached then the mobile will camp on a macro cell ( Fast moving mobile)

++If the mobile don't leave the coverage area of the serving cell before penality time is reached then it will camp on a micro cell ( Slow moving mobile)

why this mechanism ?

let's assume that d is the distance between the 2 cells boundaries

speed = d / penality time and then the bts will know now the speed of the mobile

And then C2 is only used for speedy mobile and only when hierarchical cell structure is present

[ozcank]

thank you so much for your useful sharing .

best regards,

[ghassen]

thank you so much for your useful sharing .


best regards,

@ozcank


i have updated the post

[punto]

In idle mode behaviour of MS ... not dedicated when you do HO ... for not mix up things ... to make it clear ...

#cell selection is based on the C1 criterion and cell priority
#cell RE-selection is based on the C2 criterion taking into account the mobile speed

Cell Selection and Cell Reselection
# Performed by MS
# Controlled by parameters broadcast on the BCCH carrier of each cell

P
p.s. @santosjj ... this is taken from your doc, is good and clear ... so pls., credit goes to santosjj ...

[ghassen]

In idle mode behaviour of MS ... not dedicated when you do HO ... for not mix up things ... to make it clear ...

#cell selection is based on the C1 criterion and cell priority
#cell RE-selection is based on the C2 criterion taking into account the mobile speed

Cell Selection and Cell Reselection
# Performed by MS
# Controlled by parameters broadcast on the BCCH carrier of each cell

P

yes for sure punta assuming that every body know it already

[radio_network]

Thanks guys for your reply. Very nice and intresting

[Mr.David]

Please find attached a document showing a dual band strategy.
Enjoy.

Dear My Friend Santosjj,

Just Positive thinking
I don't know it, but i have ever Post this file in this Forum
http://www.finetopix.com/showthread....hlight=siemens