Brief of SMS protocol(1)

1. Ts24.011: Point-to-Point (PP) Short Message Service (SMS) support on mobile radio interface

• Protocols and protocol architecture:

SM‑AL
SM‑TL						<--- SM‑TP protocol --->
SM‑RL				SMR		<--- SM‑RP protocol --->		SMR
CM‑sublayer				SMC		<--- SM‑CP protocol --->		SMC
MM/LLC/GMM						CS/PS/Iu-PS protocal

• An SMC entity communicates with a corresponding peer entity using an MM connection for CS in A/Gb and Iu mode or the LLC layer for GPRS in A/Gb mode or the GMM-connection in for PS in Iu mode

1. CM procedures

• connection establishment procedures
• RP Data Unit (RPDU) transfer procedures
• connection release procedures
• procedures for abnormal cases

Table 8.1/3GPP TS 24.011: Message types for short message and notification transfer on CM

8 7 6 5 4 3 2 1 0 0 0 0 0 0 0 1 CP‑DATA 0 0 0 0 0 1 0 0 CP‑ACK 0 0 0 1 0 0 0 0 CP‑ERROR

1. RL procedures

• TP Data Unit (TPDU) relay procedures
• notification relay procedures
• procedures for abnormal cases

Table 8.3/3GPP TS 24.011: Coding of Message Type Indicator

Bit value	Direction	RP‑Message
3 2 1
0 0 0	ms ‑> n	RP‑DATA
0 0 0	n ‑> ms	Reserved
0 0 1	ms ‑> n	Reserved
0 0 1	n ‑> ms	RP‑DATA
0 1 0	ms ‑> n	RP‑ACK
0 1 0	n ‑> ms	Reserved
0 1 1	ms ‑> n	Reserved
0 1 1	n ‑> ms	RP‑ACK
1 0 0	ms ‑> n	RP‑ERROR
1 0 0	n ‑> ms	Reserved
1 0 1	ms ‑> n	Reserved
1 0 1	n ‑> ms	RP‑ERROR
1 1 0	ms ‑> n	RP‑SMMA
1 1 0	n ‑> ms	Reserved
1 1 1	ms ‑> n	Reserved
1 1 1	n ‑> ms	Reserved

1. Sample diagrams