CoRE M. Becker, Ed.
Internet-Draft ComNets, TZI, University Bremen
Intended status: Standards Track K. Li
Expires: August 9, 2013 Huawei Technologies
K. Kuladinithi
T. Poetsch
ComNets, TZI, University Bremen
February 5, 2013
Transport of CoAP over SMS, USSD and GPRS
draft-becker-core-coap-sms-gprs-03
Abstract
The Short Message Service (SMS) and Unstructured Supplementary
Service Data (USSD) of mobile cellular networks is frequently used in
Machine-To-Machine (M2M) communications, such as for telematic
devices. The service offers small packet sizes and high delays just
as other typical low-power and lossy networks (LLNs), i.e. 6LoWPANs.
The design of the Constrained Application Protocol (CoAP), that took
the limitations of LLNs into account, is thus also applicable to
telematic M2M devices. The adaptation of CoAP to the SMS or USSD
transport mechanisms and the combination with IP transported over
cellular networks is described in this document.
Status of this Memo
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This Internet-Draft will expire on August 9, 2013.
Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the
document authors. All rights reserved.
Becker, et al. Expires August 9, 2013 [Page 1]
Internet-Draft CoAP SMS/USSD/GPRS February 2013
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Internet-Draft CoAP SMS/USSD/GPRS February 2013
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Motivation . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Requirements Language . . . . . . . . . . . . . . . . . . . . 5
4. Scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.1. MO-MT Scenarios . . . . . . . . . . . . . . . . . . . . . 5
4.2. MT Scenarios . . . . . . . . . . . . . . . . . . . . . . . 6
4.3. MO Scenarios . . . . . . . . . . . . . . . . . . . . . . . 7
5. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6. Message Exchanges . . . . . . . . . . . . . . . . . . . . . . 13
6.1. Message Exchange for SMS in a Cellular-To-Cellular
Mobile-Originated and Mobile-Terminated Scenario . . . . . 13
6.2. Message Exchange for USSD . . . . . . . . . . . . . . . . 14
7. Encoding of CoAP for non-IP transports . . . . . . . . . . . . 15
7.1. Encoding of CoAP for SMS transport . . . . . . . . . . . . 15
7.2. Encoding of CoAP for USSD transport . . . . . . . . . . . 16
8. Message Size Implementation Considerations . . . . . . . . . . 16
9. Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . 16
10. Options . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
10.1. New Options for mixed IP/non-IP operation. . . . . . . . . 17
11. URI Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . 17
11.1. URI Scheme . . . . . . . . . . . . . . . . . . . . . . . . 17
11.1.1. Formal Definition . . . . . . . . . . . . . . . . . . 18
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