Channelization codes are orthogonal codes used to spread the signal and hence provides channel separation, that is, channelization codes are used to separate channels from a cell.
To Know more on WCDMA
Tuesday, October 11, 2011
Monday, October 10, 2011
Consider downlink only, what are the major components in calculating maximum path loss, starting from NodeB?
· NodeB CPICH transmit power.
· Jumper and feeder connector loss.
· Antenna gain.
· Over-the-air loss.
· Building / vehicle penetration loss.
· Body loss.
Parameter Dictionary from well known Vendor
Google Mapinfo Tool
Wednesday, October 5, 2011
How much is your HSDPA (max) link power?
HSDPA link power is typically 4
to 5dB below the maximum NodeB maximum output power. For example, for 43dBm maximum NodeB power
the HSDPA link power is 39dBm.
Tuesday, October 4, 2011
What is a typical CPICH power?
CPICH power typically takes
about 10% of the total NodeB power. For
a 20W (43dBm) NodeB, CPICH is around 2W (33dBm).
In urban areas where in-building coverage is taken
care of by in-building installations, the CPICH may sometimes go as low as 5%
because:
- The coverage area is small since users are close to the site, and
- More power can be allocated to traffic channels.
Saturday, September 3, 2011
How much power usually a NodeB is allocated to control channels?
The power allocated to control
channels may depend on equipment vendor recommendation. Typically no more than 20% of the total NodeB
power is allocated to control channels, including CPICH. However, if HSDPA is deployed on the same
carrier then the total power allocated to control channel may go up to 25 to
30% because of the additional HSDPA control channels required.
Friday, September 2, 2011
What is a typical EiRP?
The EiRP depends NodeB transmit
power, cable and connector loss and antenna gain. With a sample system of 43dBm transmit power,
a 3dB cable and connector loss and a 17dBi antenna gain, the EiRP = 43 – 3 + 17
= 57dBm.
Download Excel sheet of UMTS Link Budget
What is a typical soft handover gain in your link budget?
- CS-12.2k: 3dB (UL), 2dB (DL)
- PS-64k: 1dB (UL), 0dB (DL)
- PS-128k: 1dB (UL), 0dB (DL)
- PS-384k: 1dB (UL), 0dB (DL)
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