Q.5 Time and frequency offset in uplink

3GPP45.005GSM/EDGE Radio transmission and receptionTS

For uplink in VAMOS mode, i.e. both interference and sensitivity limited cases VAMOS subchannel 1 is offset in time and frequency with respect to VAMOS subchannel 2. In all these cases, the GMSK burst from VAMOS subchannel 1 is:

– offset in time compared to VAMOS subchannel 2 according to the probability distribution:

– offset in frequency compared to VAMOS subchannel 2 according to the probability distribution: where and are given in the table Q.5-1

Table Q.5-1 Frequency Offset Parameters for Paired Subchannel

Frequency Band

850/900

1800

1900

45 Hz

90 Hz

95 Hz

10 Hz

17 Hz

17 Hz

The time and frequency offset of VAMOS subchannel 1 with respect to VAMOS subchannel 2 shall be constant within a burst and may be selected in an implementation dependent way such that the above probabilities are satisfied.