Q.2 Interferer configurations in uplink

3GPP45.005GSM/EDGE Radio transmission and receptionTS

Four different interference scenarios are defined for VAMOS uplink as follows:

Table Q.2-1 Reference Test Scenario 1

Reference Test Scenario	Interfering Signal	Interferer power level relative to Co-channel 1	TSC	Interferer Delay range
VUTS-1	Co-channel 1 Co-channel 2	– 0 dB	none none	no delay no delay

Table Q.2-2 Reference Test Scenario 2

Reference Test Scenario	Interfering Signal	Interferer power level relative to Adjacent 1	TSC	Interferer Delay range
VUTS-2	Adjacent 1 Adjacent 2	– 0 dB	none none	no delay no delay
Note: Both the Adjacent channel interfers are at the same adjacent channel frequency.

Table Q.2-3 Reference Test Scenario 3

Reference Test Scenario	Interfering Signal	Interferer power level relative to Co-channel 1	TSC	Interferer Delay
VUTS-3	Co-channel 1*) Co-channel 2*)	– 0 dB	none none	74 symbols 74 symbols
*) In calculating I1 (see table 2ac), the power of the delayed interferer shall be measured over the active part of the burst of VAMOS sub-channel 2.

Table Q.2-4 Reference Test Scenario 4

Reference Test Scenario	Interfering Signal	Interferer power level relative to Co-channel 1	TSC	Interferer Delay
VUTS-4	Co-channel 1 Adjacent 1	– 3 dB	none none	no delay no delay

In all the reference scenarios in uplink, VUTS-1 to VUTS-4, the interferers are GMSK modulated. The power of the interferer is measured before any receiver filtering and during the active part of the desired burst (see 3GPP TS 45.004). No Training Sequence Code (TSC) is used for the interferers, and thus the midamble is filled with random data bits.

Power ramping according to the requirements in Annex B shall be applied to all delayed interferers.

NOTE: The non-delayed interferer is the same signal for which reference interference performance requirements normally apply (see clause 6.3).

In adjacent timeslots of the delayed interferers no power shall be applied. The delay is measured from the same bit position in the burst of VAMOS subchannel 2 signal and the interferer burst, where the position in VAMOS subchannel 2 signal is the reference position.

The C/I1 values in table 2ac are ratios of received powers expressed in dB, where C is the received power of VAMOS subchannel 2 using Normal burst for GMSK (see 3GPP TS 45.002) and I1 is the received power of Co-channel 1 (VUTS-1, VUTS-3 and VUTS-4) or Adjacent channel 1 (VUTS-2). VAMOS subchannel 1 shall be at an input level relative to VAMOS sub-channel 2 according to the Subchannel power imbalance ratio on uplink (SCPIR_UL) which is specified in table 2ac.

The wanted signals VAMOS subchannel 2 and VAMOS subchannel 1 and the interfering signals of the test scenarios in tables Q.2-1 to Q.2-4 are added to both RX antennas.