wiki:Manual/Scenario/CDMA/input

You are here: Manual / Introduction / CDMA input Parameters

TracNav


CDMA input Parameters

The default CDMA values in SEAMCAT are given as examples but would need to be tuned for the particular scenario that is being simulated and that more detailed can be found in publications such as (6) or in (4) and (5). This page has been prepared based on the attached manual.

Defining a 3GPP blocking mask in SEAMCAT

As an example of a BS blocking mask (i.e. CDMA UL as victim), TS25.104(1) have shown that different values may need to be considered depending on the environment:


ACS depending on the estimated Cell size

In addition, as for the unwanted emissions case, considering the gap between the two bands, not only the ACS has to be considered, but also values for the blocking at larger frequency offsets. TS25.104(1) provides the following values that were considered in the simulations:


Blocking depending on the estimated Cell size (Example here taken in the band VIII)


Illustration of the blocking attenuation at the BS used in SEAMCAT and its derivation from the 3GPP specification (Example for a wide area BS scenario)

Defining a 3GPP unwanted emission mask at the BS

As an example of a BS spectrum emission masks (i.e. CDMA DL as interferer), TS25.104(1) have shown that different values may need to be considered depending on the BS maximum output power. The table beow presents Spectrum emission mask values, BS maximum output power P >= 43 dBm.


Spectrum emission mask values, BS maximum output power P >= 43 dBm (from (1))

Assuming a BS Tx power of 43 dBm, the equation of the above table gives the SEAMCAT input as presented below. Note that for this example, we add the limit from ITU-R SM.329 for frequency offset above 12.5 MHz(2).


Example of derivation of 3GPP spectrum emission mask into a SEAMCAT input format (with addition of the ITU-R SM.329 limit).


Illustration of the spectrum emission mask at the BS used in SEAMCAT and its derivation from the 3GPP specification and ITU-R SM.329 (for frequency offset larger than 12.5 MHz).

Defining a 3GPP unwanted emission mask at the UE

As an example of a UE spectrum emission masks (i.e. CDMA UL as interferer), TS25.101(3) indicates that the power of any UE emission shall not exceed the levels specified below


Spectrum Emission Mask Requirement

The above table provides directly the values in dBc which are also the format for the SEAMCAT input. Therefore the value translate into SEAMCAT as presented below.


Example of derivation of 3GPP spectrum emission mask into a SEAMCAT input format.


Illustration of the spectrum emission mask at the UE used in SEAMCAT and its derivation from the 3GPP specification.

A SEAMCAT workspace is available.

References

(1) 3GPP Technical Specification TS25.104 (Release 7), Base Station (BS) radio transmission and reception (FDD), 2005-12
(2) Recommendation ITU-R SM.329: Unwanted emissions in the spurious domain
(3) 3GPP Technical Specification TS25.101 (Release 7), User Equipment (UE) radio transmission and reception (FDD), 2005-12
(4) ECC Report 82: Compatibility study for UMTS operating within the GSM 900 and GSM 1800 frequency bands (5) ECC Report 96: Compatibility between UMTS 900/1800 and systems operating in adjacent bands (6) WCDMA for UMTS by Holma and Toskala

Attachments