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SMS Overview
Wang Changhong
Motorola Beijing Design Center
PCS Asia Beijing Design Center
Motorola Confidential Proprietary
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Outline
• SMS Protocol Stack
• R-UIM SMS Support
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SMS Protocol Stack
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General Description
SMS Relay Layer.
SMS Transport Layer
SMS Teleservice Layer
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General Description
• The Short Message Service (SMS) allows the
exchange of short messages between a mobile
station and the wireless system, and between the
wireless system and an external device capable of
transmitting and optionally receiving short
messages. The external device may be a voice
telephone, a data terminal or a short message entry
system.
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General Description (Cont.)
• The Short Message Service consists of message
entry features, administration features, and
message transmission capabilities. These features
are distributed between a wireless system and the
SMS message center (MC) that together make up
the SMS system. The MC may be either separate
from or physically integrated into the wireless
system.
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General Description (Cont.)
• Short messages and acknowledgments can be
transmitted to or from the mobile station whether
it is idle or engaged in a voice or data call.
• SMS provides support for PTP or Broadcast of
messages. A broadcast message is not
acknowledged by the mobile station. Broadcast
Messaging Services may be made available to
mobile stations on a CDMA Paging Channel or
CDMA Forward Traffic Channel.
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General Description (Cont.)
• Mobile-Originated: Submitted to an SMS service
provider by a mobile station.
• Mobile-Terminated: Delivered to a mobile station
by an SMS service provider.
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General Description (Cont.)
Network Reference Model
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General Description (Cont.)
SMS protocol stack
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CDMA
SMS Protocol Stack
•
•
•
•
General Description
SMS Relay Layer.
SMS Transport Layer
SMS Teleservice Layer
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SMS Relay Layer
• The SMS Relay Layer provides the interface
between the SMS Transport Layer and the Link
Layer used to carry short message traffic.
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SMS Relay Layer (Cont.)
Um Interface
• On the Um Interface, the SMS Relay Layer
supports the SMS Transport Layer by providing
the interface to the TIA/EIA-95-B transmission
protocols needed to carry SMS data between
CDMA mobile stations and base stations.
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SMS Relay Layer (Cont.)
N Interface
• The N reference point is assumed to be an
intersystem network link with connectivity to the
MC.
• SMS protocols and message formats on
intersystem links may differ from those used on
the CDMA air interface. The N Interface Relay
Layer is responsible for formatting and parsing
SMS messages as necessary when transmitting
and receiving messages on the intersystem links.
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SMS Relay Layer (Cont.)
Relay Layer Functions
• Delivering Transport Layer messages to the next
relay point or end point.
• Error indications to the Transport Layer.
• Forwarding messages to the Transport Layer.
• Controlling the Link Layer used for message relay.
• Formatting messages according to the SMS
standards and/or other message standards.
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SMS Relay Layer (Cont.)
Services Provided by the Relay Layer
• The Um Interface Relay Layer provides Transport
Layer message delivery between mobile station
and base station. The service is provided as a
point-to-point service and as a broadcast service.
• The N Interface Relay Layer provides message
delivery between the base station and the MC.
This service is provided as a point-to-point service
only.
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SMS Relay Layer (Cont.)
Services Provided by Um Interface
• Transmission of Data Burst Messages containing
SMS data on the Access, Paging and Traffic
Channels to/from specific mobile stations.
• Reception of Data Burst Messages containing
SMS data on the Access, Paging and Traffic
Channels.
• Determination of the maximum message size
permitted on the Access, Paging and Traffic
channels.
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SMS Relay Layer (Cont.)
Services Required from N Interface
• Delivery of SMS messages to an MC.
• Reception of SMS messages from an MC.
• Report of the success/failure of message delivery.
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Standard Data Burst Message Burst Type
Assignments
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Standard Service Option Number
Assignments
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SMS Protocol Stack
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General Description
SMS Relay Layer.
SMS Transport Layer
SMS Teleservice Layer
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SMS Transport Layer
• The SMS Transport Layer resides in SMS bearer
service end points and relay points. In a bearer
service end point, the SMS Transport Layer
provides the means of access to the SMS system
for Teleservices that generate or receive SMS
messages. In a bearer service relay point, the
Transport Layer provides an interface between
Relay Layers.
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Transport Layer Functions (For Bearer
Service End Points)
• Receiving message parameters from SMS
Teleservices Layer.
• Informing the Relay Layer messages have been
received.
• Informing the Teleservices when Relay Layer
errors are reported.
• Receiving SMS messages from the Relay Layer
and passing the messages to the SMS Teleservice.
• In mobile stations, performing authentication.
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Transport Layer Functions (For Bearer
Service Relay Points)
• Receiving SMS messages from a Relay Layer, and
forward to another Relay Layer.
• Passing confirmations or error reports between the
Relay Layers if requested.
• In TIA/EIA-95-B base stations, performing
authentication calculations.
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CDMA
SMS Protocol Stack
•
•
•
•
General Description
SMS Relay Layer.
SMS Transport Layer
SMS Teleservice Layer
PCS Asia Beijing Design Center
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CDMA
SMS Teleservice Layer
• The SMS Teleservice Layer resides in a Bearer
Service end point. The Teleservice Layer supports
basic SMS functions through a standard set of
subparameters of the Transport Layer’s Bearer
Data parameter.
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Service Type
• Wireless Paging Teleservice (WPT).
• Wireless Messaging Teleservice (WMT).
• Voice Mail Notification (VMN).
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Data Burst Message Format
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Outline
• SMS Protocol Stack
• R-UIM SMS Support
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R-UIM SMS Support
• EFSMS : This EF contains information in
accordance with IS-637 comprising short
messages (and associated parameters) which have
either been received by the MS from the network,
or are to be used as an MS originated message.
• EFSMSP : This EF contains values for Short
Message Service header Parameters (SMSP),
which can be used by the Mobile Equipment (ME)
for user assistance in preparation of mobile
originated short messages.
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R-UIM SMS Support (Cont.)
• EFSMSP : When a short message is to be sent from
the Mobile Station (MS), the parameter in the RUIM record, if present, shall be used when a value
is not supplied by the user.
• EFSMSS : This EF contains status information
relating to the short message service. The
provision of this EF is associated with EFSMS.
Both files shall be present together, or both shall
be absent from the R-UIM.
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References Standards
• TIA/EIA-637-A Short Message Service for Spread
Spectrum Systems.
• TIA/EIA-95-B Mobile Station-Base Station
Compatibility Standard for Dual-Mode Spread
Spectrum Systems.
• TSB58-A Administration of Parameter Value
Assignments for TIA/EIA Spread Spectrum
Standards.
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References Standards (Cont.)
• TSB79 Short Message Services for Wideband
Spread Spectrum Systems.
• ANSI/TIA/EIA-41-D Cellular RadioTelecommunications Intersystem Operations.
• ANSI/TIA/EIA-664 Cellular Features
Description.
• TIA/EIA/IS-820 Removable User Identity Module
(R-UIM) for TIA/EIA Spread Spectrum Standards.
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• Questions
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