1、 ETSI TR 102 570 V1.1.1 (2007-03)Technical Report Digital Enhanced Cordless Telecommunications (DECT);New Generation DECT;Overview and RequirementsETSI ETSI TR 102 570 V1.1.1 (2007-03) 2 Reference DTR/DECT-000238 Keywords DECT, radio ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANC
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5、ou find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reprod
6、uction in all media. European Telecommunications Standards Institute 2007. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTMand the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Memb
7、ers. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI TR 102 570 V1.1.1 (2007-03) 3 Contents Intellectual Property Rights4 Foreword.4 Introduction 4 1 Scope 5 2 References 5 3 Abbreviations .6 4 Overview 6 5 Applications and
8、features .6 6 Voice and audio7 6.1 Speech and audio coding8 6.1.1 Narrow band speech coding9 6.1.2 Wideband speech coding 9 6.1.3 Super-wideband speech and audio coding10 6.2 Message flow examples11 6.2.1 Outgoing wideband call, default wideband speech setup parameters, ITU-T Recommendation G.722 ch
9、osen .11 6.2.2 Incoming call wideband, negotiation results in wideband 12 6.2.3 Incoming Call Wideband, negotiation results in Narrowband12 6.2.4 Incoming call wideband, negotiation results in narrowband, No SDP offer in invite.13 7 IP-access.13 7.1 Architecture14 7.2 Transport of IP-packets in DECT
10、.14 Annex A: List of use cases / features 16 History 17 ETSI ETSI TR 102 570 V1.1.1 (2007-03) 4 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly availab
11、le for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server
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13、r may become, essential to the present document. Foreword This Technical Report (TR) has been produced by ETSI Project Digital Enhanced Cordless Telecommunications (DECT). The information in the present document is believed to be correct at the time of publication. However, DECT standardization is a
14、 rapidly changing area, and it is possible that some of the information contained in the present document may become outdated or incomplete within relatively short time-scales. Introduction The aim of the present document is to collect the requirements for “New Generation DECT“ and to define the con
15、tents of the phase 1. Clause 4 contains an overview and some background information about the “New Generation DECT“ activities. Clause 5 outlines the intended services and applications. Clause 6 provides information about the support of voice and audio services. Clause 7 deals with IP access. Annex
16、A provides information on use-cases and features as received from the DECT Forum. ETSI ETSI TR 102 570 V1.1.1 (2007-03) 5 1 Scope The present document gives an overview of the “New Generation DECT“ standardization activities and describes the architecture and the capabilities. 2 References For the p
17、urposes of this Technical Report (TR) the following references apply: NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity. 1 ETSI EN 300 175-1: “Digital Enhanced Cordless Telecommunications (DECT); Common Interface (
18、CI); Part 1: Overview“. 2 ETSI EN 300 175-2: “Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 2: Physical Layer (PHL)“. 3 ETSI EN 300 175-3: “Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 3: Medium Access Control (MAC) layer“. 4 ETS
19、I EN 300 175-4: “Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) layer“. 5 ETSI EN 300 175-5: “Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 5: Network (NWK) layer“. 6 ETSI EN 300 175-6: “Digital Enhanced
20、Cordless Telecommunications (DECT); Common Interface (CI); Part 6: Identities and addressing“. 7 ETSI EN 300 175-7: “Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 7: Security features“. 8 ETSI EN 300 175-8: “Digital Enhanced Cordless Telecommunications (DECT); Comm
21、on Interface (CI); Part 8: Speech coding and transmission“. 9 ETSI EN 300 444: “Digital Enhanced Cordless Telecommunications (DECT); Generic Access Profile (GAP)“. 10 ETSI EN 301 649: “Digital Enhanced Cordless Telecommunications (DECT); DECT Packet Radio Service (DPRS)“. 11 ITU-T Recommendation G.7
22、26 (12/1990): “40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM)“. 12 ITU-T Recommendation G.711 (11/1988): “Pulse code modulation (PCM) of voice frequencies“. 13 ITU-T Recommendation G.722 (11/1988): “7 kHz audio-coding within 64 kbit/s“. 14 ITU-T Recommendation G.729.1 (05/
23、2006): “G.729 based Embedded Variable bit-rate coder: An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729“. 15 ISO/IEC 14496-3:2005/Amd 1: “2007 Information technology - Coding of audio-visual objects - Part 3: Audio, AMENDMENT 1: Low delay AAC profile“. 16 ISO/IEC JTC1/SC29/WG
24、11 (MPEG): “International Standard ISO/IEC 14496-3: “Coding of audio-visual objects: Audio“. 17 IETF RFC 791: “Internet Protocol“. 18 IETF RFC 2460: “Internet Protocol version 6 (IPv6)“. ETSI ETSI TR 102 570 V1.1.1 (2007-03) 6 19 ITU-T Recommendation G.729 (01/2007): “Coding of speech at 8 kbit/s us
25、ing conjugate-structure algebraic-code-excited linear prediction (CS-ACELP)“. 3 Abbreviations For the purposes of the present document, the following abbreviations apply: ADPCM Adaptive Differential Pulse Code Modulation CI Common Interface CLIP Calling Line Identification Presentation DECT Digital
26、Enhanced Cordless Telecommunications DLC Data Link Control EN European Standard EV-CELP Embedded Variable Code Excited Linear Prediction T Fixed radio Termination IEC International Electrotechnical Commission IP Internet Protocol ISO International Organization for Standardization ITU International T
27、elecommunication Union LAN Local Area Network MAC Medium Access Control MDCT Modified Discrete Cosine Transform MPEG Moving Picture Experts Group MTU Maximum Transmission Unit NG DECT New Generation DECT NWK NetWorK PCMA Pulse Code Modulation A-law PCMU Pulse Code Modulation -law PHL PHysical Layer
28、PLC Packet Loss Concealment PP Portable PartPSTN Public Switched Telephone Network TDBWE Time Domain Band-Width Extension VoIP Voice over Internet Protocol 4 Overview The DECT Forum has approached TC DECT to develop the specification for “New Generation DECT“ products, based on the provided market r
29、equirements. The DECT Forum requests to define and implement in the new standards full mandatory interoperability between bases/gateways and handsets, in particular since gateways and terminals from different vendors will be mixed. To guarantee interoperability the DECT Forum intends to set up a cer
30、tification program. Therefore the DECT Forum requests from ETSI to develop test specifications in addition to the system specifications. 5 Applications and features Annex A contains a list of use cases/features, which have been proposed by DECT Forum for New Generation DECT. In order to meet the str
31、ingent time requirements, the specifications are developed in phases. The following features are included: Wideband speech. Internet access. The present document investigates the features listed above and compiles some further information, which is relevant for the development of the specifications
32、for “New Generation DECT“. ETSI ETSI TR 102 570 V1.1.1 (2007-03) 7 For the support of wideband speech ITU-T Recommendation G.722 13 has been selected as the mandatory codec. The signalling is based on GAP. The feature “Calling Line Identification Presentation“ (CLIP) is mandatory. More information c
33、an be found in clause 6. The internet access is provided by a transparent transport of IP packets over the DECT air-interface. This service is based on the Ethernet/LAN interworking of DPRS. More information can be found in clause 8. EN 300 175 base std EN 300 175 base std EN 300 175 base std EN 300
34、 175 base std EN 300 175 base std EN 300 175 base std EN 300 175 base std EN 300 175 base std GAP DPRS NG DECT Speech Application Profile Part 1: WB voice NG DECT Data Application Profile Part 2: data services Top level standards mandate a selection of features and guarantee interoperability DPRS TE
35、SDPRS TESDPRS TESDPRS TESDPRS TEST stds. Tested by DECT TESDECT TESDECT TESDECT TESDECT TESDECT TESDECT TEST stds. Test standards to check interoperability Figure 1: Structure of specifications The New Generation DECT Technical Specifications select the mandatory features, that are defined in detail
36、 in GAP, DPRS and the base standard, which are all updated to include all new functions. Test standards are used to check that products conform to the specifications. 6 Voice and audio In traditional telephony applications the supported bandwidth is 3,1 kHz. Increasing the bandwidth from narrow band
37、 (300 Hz to 3 400 Hz) to at least to 150 Hz to 7 000 Hz range (“wide band“) will allow to increase decisively the speech quality, i.e. voice better encoded on all its frequencies, with a feeling of more transparent communication, a greatly improved sensation of presence and an increased intelligibil
38、ity and listening comfort. Possible scenarios include: Internal wideband calls inside a New Generation DECT system. Calls between two New Generation DECT systems interconnected by IP packet based network (like VoIP over the Internet). Figure 2: Internal broad-band call ETSI ETSI TR 102 570 V1.1.1 (2
39、007-03) 8 IP Network Figure 3: Wideband call via Internet The New Generation DECT base station has to support both, narrow-band and wide-band speech terminals. A call may be modified from narrow-band to wide-band or from wide-band to narrow-band. 6.1 Speech and audio coding Today the DECT standard c
40、odec for speech is “Adaptive Differential Pulse Code Modulation“ (ADPCM) with 32 kbit/s as defined in ITU-T Recommendation G.726 11. It is of low complexity, offers a bandwidth of 3,1 kHz and introduces a very low delay of 0,125 ms and a quality slightly below the PSTN quality (ITU-T Recommendation
41、G.711 12 encoding) at 64 kbit/s New Generation DECT improves audio quality by implementing wideband enhanced quality audio codecs. All New Generation DECT devices should implement wideband (150 Hz to 7 kHz) audio (16 kHz frequency sampling). DECT devices supporting wideband audio are to support spee
42、ch coding format according to ITU-T Recommendation G.722 13. In addition to that, they may implement other wideband and superwideband audio codecs providing even better audio quality. In order to transport the higher bit rate of the new enhanced codecs, the bitrates per channel at the air interface
43、is doubled from 32 kbit/s in traditional DECT to 64 kbit/s. All New Generation DECT devices should be backward compatible with traditional DECT 32 kbit/s voice (GAP) devices. New Portable Parts (PP) should operate with legacy base stations, and new bases should support existing PPs. In such cases, v
44、oice quality is the traditional DECT quality (32 kbit/s ADPCM). Table 1 reviews some speech and audio codecs. Table 1: Overview of codecs Type Bandwidth (kHz) Sampling rate (kHz) Bit rate (kbit/s) Frame (ms) ITU-T Recommendation G.711 12 LOG PCM 0,3 to 3,4 8 64 0,125 ITU-T Recommendation G.726 11 AD
45、PCM 0,3 to 3,4 8 16, 24, 32, 40 0,125 ITU-T Recommendation G.722 13 Sub-Band ADPCM 0,05 to 7 16 64, 56, 48 0,125 ITU-T Recommendation G.729.1 14 EV-CELP TDBWE MDCT 0,05 to 7 16 8 to 32 20 ISO/IEC 14496-3 15 MPEG-4 ER AAC-LD Advanced Audio Coding Low Delay up to 20 up to 48 range of bit rates 10 to 2
46、0 (depends on sampling rate) ETSI ETSI TR 102 570 V1.1.1 (2007-03) 9 6.1.1 Narrow band speech coding ITU-T Recommendation G.726 11 narrow band codec is mandatory for New Generation DECT in order to ensure interoperability with existing DECT systems. ITU-T Recommendation G.711 12 narrow band codec is
47、 optional for New Generation DECT in order to improve the quality of narrow band communications and fax modem transmissions. ITU-T Recommendation G.711 12 provides slightly higher intrinsic voice quality and no transcoding for PSTN calls. Both, A-Law and -Law are supported. Table 2: ITU-T Narrow ban
48、d Speech codec for New Generation DECT Standard ITU-T Recommendation G.726 11 ITU-T Recommendation G.711 12 ADPCM LOG PCM Date 1990 1972 Bandwidth 300 Hz to 3 400 kHz 300 Hz to 3 400 kHz Sampling rate 8 kHz 8 kHz Bit rate (kbit/s) 16, 24, 32, 40 64 Embedded Scalability N N Type ADPCM LOG PCM Frame s
49、ize 0,125 ms 0,125 ms Algorithmic Delay 0,125 ms 0,125 ms Complexity 12 MIPS 0,01 MIPS RAM (KB) 1 0 6.1.2 Wideband speech coding ITU-T Recommendation G.722 13 codec is chosen as mandatory wideband codec for New Generation DECT in order to greatly increase the voice quality by extending the bandwidth from narrow band to wideband ITU-T Recommendation G.722 13 provides a high wideband quality at bit rates of 64 kbit/s with low complexity and very low delay. In addition, the ITU-T Recommendation G.72
