The SGSN then sends new QoS parameters and a new radio priority parameter to the MS in a MODIFY PDP CONTEXT REQUEST message. The GGSN then checks if the new QoS is compliant with its capabilities and sends back to the SGSN in an UPDATE PDP CONTEXT RESPONSE message the negotiated QoS that takes into account if necessary some restrictions. The SGSN sends an UPDATE PDP CONTEXT REQUEST message to the GGSN with a new QoS. Initiated by SGSN The PDP context modification initiated by the SGSN may occur after an inter-SGSN RA update procedure to change the negotiated QoS, the radio priority level, or the TFT negotiated during the PDP context activation procedure. The PDP context modification procedure initiated by the MS or GGSN was introduced in Release 99 of the GPRS recommendations, even though the PDP context modification procedure initiated by the SGSN was already introduced in Release 97 of the GPRS recommendations. The PDP context modification may be initiated by the MS, the SGSN, or the GGSN.
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