MOBILE COMMUNICATION SYSTEM, SGW, A TERMINAL, A METHOD OF RECEIVING A MOBILE COMMUNICATION SYSTEM, A METHOD OF RECEIVING SGW AND A METHOD OF RECEIVING A TERMINAL Russian patent published in 2019 - IPC H04W36/12 

FIELD: mobile connection.

SUBSTANCE: invention relates to the mobile communication. Mobile communication system includes UE (45), MME (25), SGSN (27) and SGW (15). SGW (15) includes means for, when ISR is active in UE (45), MME (25), SGSN (27) and SGW (15), send downlink data notification message to MME (25) and SGSN (27), and when a bearer modification request message is received from another MME (35) or another SGSN (37) other than said MME (25) and SGSN (27), resend the downlink data notification message to only another MME (35) or another SGSN (37) sending the bearer modification request message.

EFFECT: technical result is to ensure a reliable reception of the downlink data packet that is sent during the UE movement.

9 cl, 12 dwg