Cell Planning

Hi Daniel, may be this basic definition could help you (from some documentation):
A TDMA frame consist of eight timeslots or physical channels. Each timeslot
has a length of 0.577 ms. The length of a TDMA frame is therefore 4.615 ms.
A 26-TDMA multi-frame is defined as a succession of 26 TDMA frames, and
corresponds to exactly 120 ms (26 x 4.615ms) cycle used for the TCH/F and
TCH/H.
A 51-TDMA multi-frame is defined as a succession of 51 TDMA frames, and
corresponds to a 235 ms (51 x 4.615ms) cycle.
A Super-frame is a succession of 51 x 26 TDMA frames (6.12 sec). This is
the smallest cycle for which the organization of all channels is repeated,
because of these smallest common denominators.
A Hyper-frame is a succession of 2048 x 51 x 26 TDMA frames (3 h, 28 min,
53 sec & 760 ms). It is a numbering period and determines all the cycles in the
transmission of the radio path. The frame number in the hyper-frame (absolute
TDMA frame number) is e.g. the smallest cycle used for frequency hopping
and ciphering.
We have seen that a physical channel is defined by a frequency and a timeslot
number. We have also seen that a physical channel can be used to carry various
logical channels. At any point in time, the MS must know on which logical channel to
send to the BTS and which logical channel is being sent from the BTS. For example
the timeslot allocated to a user is usually used for traffic (TCH) but sometimes is used
for signalling (either FACCH or SACCH). The MS and BTS must know when to
send/receive each of these logical channels.
In order to achieve this, sequences of logical channels are defined. They are called
‘multi-frames’. There are two types of multi-frames. The traffic channel multi-frame is
26-TDMA frames long, and the BTS signalling multi-frame is 51 TDMA frames long.
Each multi-frame can have different combinations of logical channels depending on
the configuration of the BTS.

Hi all
if we want to make a dual band RBS 2206 with one sector 900 had 8 TRU and the another sector 1800 had 4 TRU in the same direction .. the question is we can assign one BCCH for these two sector ?? , because of it is no possible for two sector to be in the same direction with 2 BCCH .

Nobody is ready to anwser my question? pls somebody have help me out? From past 3 days i am asking queries nobody is reply>

Pls help me out..

1.can i know the reason why it is getting reduced? Is it due to hardware issue or due to some other reason?

2.Why it will affect the HSR due to low TCH availability even though there is no congestion and no hardware alarm?

hello boreau,

i’m not familiar with TEMS 7.0 (only 6.1), but it should be fairly identical to the 6.1… so what you’re doing is correct.

why not send an email to TEMS directly ? you must be entitled to some support after having purchased it ?

Att. PIX,

Would you please explain me in details about cell planning and the steps of frequency planning. What r the trade offs. And the most important is Optimization.

I am really in need of these features.

waiting for reply.
Tanvir

Hello KR,

AMR is not a feature itself, it is more like the availability to use different codecs, rather than just EFR, FR or HR.

You have two features associated :
codec adaptation : within a same channel rate (FR or HR), it is possible to change the codec, in order to increase or decrease the protection of the speech. When changing from one codec to another, the call remains in the same timeslot. It is not a Handover.

channel adaptation : depending on the C/I and the cell load, the BSC can order to make a HO from FR to HR (good quality, loaded cell) or from HR to FR (bad quality and cell with less load).

FR to HR : the call performs a HO from a FR timeslot to a HR timeslot, in order to gain space. Since the C/I is good, the speech quality is not affected by this HO.

HR to FR : other way around 🙂

The codec adaptation… maybe i should explain more in details :
you have a subset of codecs for HR timeslots and another subset of codecs for FR timeslots. So you can apply codec adaptation for HR calls only, FR calls only or BOTH.
At the same time, the codec on the UL path and the codec at the DL path can be different. Each path is handled separately.

Ok… enough :))
Regards,

hi pix

thanks for the ansr
m sorry if i irritated u ….. the expression i got from ur last words Ok…. Enough !

AMR is an audio data compression scheme. We have 14 modes of codec….. 8 for FR channel and 6 for HR channel …..i got it

but my question is why do we implement it ?
To increase the weak signal ( robustness of the n/w as it provides improvement upto S/N = 4-6 dB )
To increase the call carrying capacity as it increases or decreases the data rate using appropriate codecs depending upon the RF conditions …. as u told link adaptation …..