| 摘要 |
An SGSN handover procedure, for use in a GPRS network, reduces the need for resequencing inthe SGSN. This is achieved in that the old SGSN sends a message to the GGSN, requesting that it stop transmission of data. Ar that time, the ols SGSN transfers to the new SGSN and data which it needs to transmit to the mobile station. The GGSN resumes transmission of data, this time to the new SGSN, when the handover is complete. This requirement for the new SGSN to resequence the received data. The signal from the old SGSN to the GGSN, requesting it to stop transmission ,can be initiated when the old SGSN receives a message for the new SGSN, informing it that the mobile station has moved to a cell served by the new SGSN. Alternatively, the signal canb e sent fromt eh old SGSN to the GGSN, on receipt by teh old SGSN of a message fro the serving base station, informing it that the mobile station has changed to a cell served by another SGSN.
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