| 摘要 |
The system comprises wireless user equipment (UE) and a core network unit interfaced with the UE through a wireless access network. A first short message relay (SMR) entity and a first short message control entity (SMC) are provided in the core network unit or the UE, the other one having a second SMR entity and a second SMC entity. The method of exchanging SMS data comprises, in the first SMC entity:-transmitting to the second SMC entity first control protocol data (CP_DATA) conveying relay protocol data (RP_DATA) provided by the first SMR entity,-receiving from the second SMC entity second CP_DATA conveying relay protocol acknowledgement information (RP_ACK) from the second SMR entity; and-retransmitting the first CP_DATA unless an acknowledgement is received from the second SMC entity before a timer expires. The second CP_DATA is interpreted as an acknowledgement for deciding whether the first CP_DATA is to be retransmitted.
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