Nói cách khác, kéo các thông tin luôn luôn là khởi đầu của khách hàng trong khi việc đẩy mạnh thông tin luôn luôn là khởi xướng bởi máy chủ. Đẩy khuôn khổ, quy định của Diễn đàn WAP trong [WAP-250, được thể hiện trong hình . Trong khuôn khổ thúc đẩy, một giao dịch đẩy được bắt đầu bằng một Initiator Push (PI). Initiator Push, | 56 Mobile Messaging Technologies and Services Originator SME 2 submission report positive or negative Figure Message submission Message Submission In the context of SMS the term submission refers to the transfer of a message segment from the originator SME to the serving SMSC Figure . Once the message segment has been successfully received by the serving SMSC the originator SMSC queries the HLR in order to route forward the message segment towards the recipient SME. At the transfer layer a message segment is conveyed as part of a TPDU of type SMS-SUBMIT. The TPDU can contain the following parameters Message type SMS-SUBMIT Request for rejecting duplicated messages Message validity period Request for reply path Request for a status report Message reference Address of the recipient SME Protocol identifier Data coding scheme User data header User data with associated length . Upon receipt of the message by the serving SMSC the SMSC provides a submission report to the originator SME. Two types of reports can be provided a positive submission report for a successful submission or a negative submission report for a failed submission. If the submission report is not received after a given period of time then the originator SME concludes that the message submission has failed. TPDU Layout A the transfer layer the TPDU of type SMS-SUBMIT has the layout shown in Figure . In this chapter a specific graphical convention is used for the representation of TPDU layouts. Mandatory parameters are represented by grey-shaded boxes and optional parameters are represented by white boxes. Short Message Service 57 0 1 or 7 TP-Validity-Period 1 Oto 140 Figure TPDU layout type SMS-SUBMIT TPDU Parameters The TPDU of type SMS-SUBMIT contains the parameters listed in Table . The SMS standard defines three representations for numeric values and alphanumeric values assigned to TPDU parameters. These representations integer representation octet .
