01-13 Short Message Procedure

M900/M1800 Base Station Subsystem Signaling Analysis Manual Contents

Issue 01 (2007-03-15) Huawei Technologies Proprietary i

Contents

13 Short Message Service Procedure .......................................................................................13-1 13.1 Overview.......................................................................................................................................................13-2 13.2 Normal Procedure.........................................................................................................................................13-3

13.2.1 SMS Procedure on SDCCH When MS Is Calling .............................................................................13-3 13.2.2 SMS Procedure on SDCCH When MS Is Called...............................................................................13-5 13.2.3 SMS Procedure on SACCH When MS Is Calling .............................................................................13-6 13.2.4 SMS Procedure on SACCH when MS Is Called................................................................................13-7

13.3 Internal Handling of BSC.............................................................................................................................13-7 13.4 Abnormal Cases............................................................................................................................................13-8

Figures M900/M1800 Base Station Subsystem

Signaling Analysis Manual

ii Huawei Technologies Proprietary Issue 01 (2007-03-15)

Figures

Figure 13-1 SMS procedure on SDCCH when MS is calling ............................................................................13-3

Figure 13-2 SMS procedure on SDCCH when MS is called..............................................................................13-5

Figure 13-3 SMS procedure on SACCH when MS is calling ............................................................................13-6

Figure 13-4 SMS procedure on SACCH when MS is called..............................................................................13-7

M900/M1800 Base Station Subsystem Signaling Analysis Manual 13 Short Message Service Procedure

Issue 01 (2007-03-15) Huawei Technologies Proprietary 13-1

13 Short Message Service Procedure About This Chapter

The following table lists the contents of this chapter.

Title Description

13.1 Overview Introduces cell broadcast service (CBS) procedures.

13.2 Normal Procedure Describes normal CBS procedures.

13.3 Internal Handling of BSC Describes the BSC internal handling in CBS procedures.

13.4 Abnormal Cases Describes abnormal CBS procedures and offers guidance to troubleshooting.

13 Short Message Service Procedure M900/M1800 Base Station Subsystem


13-2 Huawei Technologies Proprietary Issue 01 (2007-03-15)

13.1 Overview Short messages can be transmitted either through SDCCH, SACCH. SMS procedure can classify short message calling procedure and called procedure.



13.2 Normal Procedure 13.2.1 SMS Procedure on SDCCH When MS Is Calling

Signaling procedure

Figure 13-1 SMS procedure on SDCCH when MS is calling

BTSMS BSC MSC

Channel ACT ACK 4

EST IND(CM Service REQ)8

Channel REQ 1 Channel RQD 2

Channel ACT 3

IMM ASS CMD 5SABM 6

CR(CMP L3 information) 9

UA 7

CC 10Authentication REQ 11

Authentication RSP 12

SABM(SAPI 3) 13

EST IND (SAPI 3) 15UA 14

CP DATA 18

CP ACK 19

CM Service Accept

CP DATA 20

CP ACK 21

Clear CMD 22Channel REL 23

Deactive SACCH 24DISC 25UA 26

REL IND 27

RF Channel REL 28

RF Channel REL ACK 29Clear CMP 30

RLSD 31

RSLD CMP 32

CIPH Mode CMD 16

CIPH Mode CMP 17




Procedure explanation Step 1 (1) ~ (8) in Figure 13-1 illustrates a random access and immediate assignment procedure, in

which BSS allocates signaling channel to MS.

Step 2 (15) ~ (21) is a short message transmission procedure.

MS sends SABM again, notifying the network side that this user needs short message service (SMS). Then, BSC provides a transparent-transmission channel for MS to exchange short message information with MSC. In this procedure, the MSCs of some manufacturers are capable to send ASS REQ to BSC, requesting it to assign channel for short message transmission. The time for sending ASS REQ is the same as that for a common call. BSC can provide SMS either by allocating other channels or by using the original SDCCH.

Point to Point short message protocol is divided into connection management layer (CM), relay layer (RL), transport layer (TL) and application layer (AL).

CP_DATA and CP_ACK are the message on CM layer, CP_DATA is used to transmit the content of RL and AL message, CP_ACK is the acknowledgement message of CP_DATA.

Step 3 (22) ~ (35) is a release procedure.

MSC initiates a release procedure upon the completion of short message transmission.

----End



13.2.2 SMS Procedure on SDCCH When MS Is Called

Signaling procedure

Figure 13-2 SMS procedure on SDCCH when MS is called

BTSMS BSC MSC

Channel RQD 4

Paning CMD 1

Channel REQ 3

CR(CMP L3 information) 11

Authentication REQ 13

CIPH Mode CMD 15CIPH Mode CMP 16

EST REQ (SAPI 3) 18

UA 20

CP DATA 22

CP ACK 23

Paning CMD 2

Channel ACT 5 Channel ACT ACK 6

IMM ASS CMD 7First SABM 8 EST IND

(Page Response) 9

CC 12

Authentication RSP 14

CP_DATA 17First SABM 19

EST CNF (SAPI 3) 21

CP ACK 25

CP DATA 24

Clear CMD 26 Channel REL 27

Deactive SACCH 28DISC 29

REL IND 30RF Channel REL ACK 33

Clear CMP 34

RLSD 35RLSD CMP36

CM Service Accept

UA 10

Procedure explanation Step 1 (1) ~ (10) is a paging response and immediate assignment procedure.

MSC sends Paging CMD to page the called subscriber. MS requests for SDCCH, and responds with Paging Response.




Step 2 (17) ~ (25) is a short message setup and transmission procedure.

As for the SMS procedure when MS is called, BSC sends EST REQ to MS to establish short message connection. When EST CNF is received from MS, the connection is successfully established. BSC transparently transmits the short message till the end of the transmission. (13), (14), (15) and (16) are optional signaling procedures.

Step 3 (26) ~ (36) is a release procedure.

----End

13.2.3 SMS Procedure on SACCH When MS Is Calling

Signaling procedure

Figure 13-3 SMS procedure on SACCH when MS is calling

BTSMS BSC MSC

ACTIVE CALL

UA 5

CP DATA 6

SABM(SAPI 3) 3

CM Servic REQ 1

CM Servic ACC 2FACCH

EST IND (SAPI 3) 4

CP ACK 7

CP DATA 8

CP ACK 9

SACCH

Procedure explanation MS sends CM SERV REQ through FACCH. MSC responds with the CM SERV ACC message, and establishes CC layer connection. Then, it establishes RR layer connection on SACCH, and sends the short message



13.2.4 SMS Procedure on SACCH when MS Is Called

Signaling procedure

Figure 13-4 SMS procedure on SACCH when MS is called

BTSMS BSC MSC

ACTIVE CALL

UA 4

CP DATA 6

SABM 3EST REQ(SAPI 3) 2

EST CNF (SAPI 3) 5

CP ACK 7

CP DATA 8

CP DATA 1

CP ACK 9

ACTIVE CALL

Procedure explanation BSC receives the CP DATA message from MSC, and establishes RR layer connection for SMS. Upon the reception of CP ACK from MS, MSC sends the short message.

13.3 Internal Handling of BSC The internal handling of the BSC includes:

Step 1 The BSC detects whether the MS supports short message services according to the classmark in the message reported from the MS.

Step 2 Upon receipt of the short message from the MS, the BSC checks the [Cell Call Control Table] for the configuration of the Short message uplink disabled field. If the field is set to yes, the short message cannot be sent.

Step 3 Upon receipt of the short message from the MSC, the BSC checks the [Cell Call Control Table] for the configuration of the Short message downlink disabled field. If the field is set to yes, the short message cannot be sent.

----End




13.4 Abnormal Cases In case of exception in short message transmission, MS receives CPDATA, and responds to MSC with CP NACK, notifying the short message transmission failure to MSC.

ContentsFigures13 Short Message Service ProcedureAbout This Chapter13.1 Overview13.2 Normal Procedure13.2.1 SMS Procedure on SDCCH When MS Is Calling13.2.2 SMS Procedure on SDCCH When MS Is Called13.2.3 SMS Procedure on SACCH When MS Is Calling13.2.4 SMS Procedure on SACCH when MS Is Called

13.3 Internal Handling of BSC13.4 Abnormal Cases

01-13 Short Message Procedure

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