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.