1、 ETSI TS 102 188-1 V1.1.2 (2004-07)Technical Specification Satellite Earth Stations and Systems (SES);Regenerative Satellite Mesh - A (RSM-A) air interface;Physical layer specification;Part 1: General descriptionETSI ETSI TS 102 188-1 V1.1.2 (2004-07) 2 Reference RTS/SES-00203-1 Keywords air interfa
2、ce, broadband, IP, multimedia, satellite ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Indivi
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5、ent status of this and other ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, send your comment to: editoretsi.org Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the f
6、oregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2004. 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 registere
7、d by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI TS 102 188-1 V1.1.2 (2004-07) 3 Contents Intellectual Property Rights4 Foreword.4 1 Scope 5 2 References 5 3 Definitions and abbreviat
8、ions.5 3.1 Definitions5 3.2 Abbreviations .5 4 Air interface overview6 4.1 Network architecture 6 4.1.1 Network elements .6 4.1.2 Network interfaces7 4.2 Air interface overview7 4.3 Air interface protocol architecture7 5 Physical layer (PHY) overview8 5.1 General .8 5.2 Services provided by the phys
9、ical layer .9 5.3 Functional description of the physical layer.9 5.3.1 General9 5.3.2 Uplink .11 5.3.2.1 Overview of uplink data structures .11 5.3.2.2 Scrambling and packet assembly 11 5.3.2.3 Coding.12 5.3.2.4 Frame structure .12 5.3.2.5 Burst building13 5.3.2.6 Modulation13 5.3.2.7 Uplink carrier
10、 modes.13 5.3.2.8 Uplink Power Control .14 5.3.3 Downlink 15 5.3.3.1 Overview of downlink data structures.15 5.3.3.2 Scrambling and packet assembly 15 5.3.3.3 Coding.16 5.3.3.4 Frame structure .16 5.3.3.5 Burst building17 5.3.3.6 Modulation17 5.3.3.7 Downlink carrier modes17 5.3.3.8 Downlink power c
11、ontrol .18 5.3.4 Other physical layer functions 18 Annex A (informative): Bibliography.19 History 20 ETSI ETSI TS 102 188-1 V1.1.2 (2004-07) 4 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to th
12、ese essential IPRs, if any, is publicly available 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. Lates
13、t updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates
14、on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Satellite Earth Stations and Systems (SES). The present document is part 1 of a multi-part deliverable covering the
15、 BSM Regenerative Satellite Mesh - A (RSM-A) air interface; Physical layer specification, as identified below: Part 1: “General description“; Part 2: “Frame structure“; Part 3: “Channel coding“; Part 4: “Modulation“; Part 5: “Radio transmission and reception“; Part 6: “Radio link control“; Part 7: “
16、Synchronization“. ETSI ETSI TS 102 188-1 V1.1.2 (2004-07) 5 1 Scope The present document is an introduction to the physical layer specification for the SES BSM Regenerative Satellite Mesh - A (RSM-A) air interface family. It consists of a general description of the organization of the physical layer
17、 with reference to the parts of this multi-part deliverable where each function is specified in more detail. 2 References Void. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: Network Operations Control Centre (NOCC
18、): centre that controls the access of the satellite terminal to an IP network and also provides element management functions and control of the address resolution and resource management functionality satellite payload: part of the satellite that provides air interface functions NOTE: The satellite
19、payload operates as a packet switch that provides direct unicast and multicast communication between STs at the link layer. Satellite Terminal (ST): terminal installed in the user premises terrestrial host: entity on which application level programs are running NOTE: It may be connected directly to
20、the Satellite Terminal or through one or more networks. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: BPSK Binary Phase Shift Keying BSM Broadband Satellite Multimedia DLPC DownLink Power Control DNS Directory Name Server FDMA Frequency Division Multi
21、ple Access FEC Forward Error Correction HTTP HyperText Transfer Protocol IP Internet Protocol kbps kilo bits per second (thousands of bits per second) MAC Medium Access Control Mbps Mega bits per second (millions of bits per second) NOCC Network Operations Control Centre OQPSK Offset Quaternary Phas
22、e Shift Keying PEP Performance Enhancing Proxy PHY PHYsical PN Pseudo Noise PTP Point-To-Point QPSK Quaternary Phase Shift Keying RS Reed-Solomon RSM Regenerative Satellite Mesh ETSI ETSI TS 102 188-1 V1.1.2 (2004-07) 6 SLC Satellite Link Control ST Satellite Terminal TCP Transmission Control Protoc
23、ol TDM Time Division Multiplexing TDMA Time Division Multiple Access ULPC UpLink Power Control USB Universal Serial Bus UW Unique Word 4 Air interface overview 4.1 Network architecture 4.1.1 Network elements Figure 4.1.1 illustrates the network architecture from the satellite terminal viewpoint and
24、also shows the different interfaces as seen by the satellite terminal. SatellitepayloadSatellitepayloadNetwork OperationsControl Centre(NOCC)Network OperationsControl Centre(NOCC)U I/FN I/FSatelliteTerminalSatelliteTerminalTerrestrialHostTerrestrialHostT I/FSatelliteTerminalSatelliteTerminalTerrestr
25、ialHostTerrestrialHostU I/FP I/FN I/FLogical in terfacePhysical interfaceT I/FFigure 4.1.1: Network architecture The network elements are described below. Network Operations Control Centre (NOCC): the NOCC controls the access of the satellite terminal to an IP network and also provides element manag
26、ement functions and control of the address resolution and resource management functionality. Satellite payload: the satellite payload is the part of the satellite that provides air interface functions. The satellite payload operates as a packet switch that provides direct unicast and multicast commu
27、nication between STs at the link layer. Satellite Terminal (ST): the ST is the terminal that is installed in the user premises. It offers an IP data transportation service over the satellite network. Terrestrial host: this is the entity on which application level programs are running. It may be conn
28、ected directly to the Satellite Terminal or through one or more networks. It maintains an IP route to one or more STs and uses their services to transmit IP data over the satellite network to destination IP hosts. ETSI ETSI TS 102 188-1 V1.1.2 (2004-07) 7 4.1.2 Network interfaces The network interfa
29、ces are briefly described below. U interface: this is the physical interface (the air interface) between a ST and the Satellite payload. All data transactions to and from the terminal including all user data to the destination ST, all management data to the NOCC and all signalling go over this inter
30、face. The same physical interface is used for both the BSM I.5 and I.6 interfaces. T interface: this is the physical interface between the ST and the hosts. Multiple hosts can be connected to a single ST. The same physical interface is used for both the BSM I.2 and I.10 interfaces. N interface: this
31、 is a logical interface between the ST and NOCC for transaction of management and signalling data between a ST and the NOCC. P interface: this is a logical interface between two STs for transaction of peer layer signalling traffic and user data traffic. 4.2 Air interface overview All satellite termi
32、nals employ the same air-interface using FDMA-TDMA transmissions in the uplink to the satellite and TDM in the downlink from the satellite. Different sizes of the transmission platform support user-data burst rates from the low kbps to multiple Mbps. The uplink uses spot beams that provide coverage
33、for cells geographically distributed over the satellite coverage area. The downlink also uses spot beams for point-to-point services but in addition to these spot beams, there are separate downlink broadcast beams that cover a major portion of the coverage area. The satellite and NOCC manage the ass
34、ignment of uplink bandwidth in each beam to individual users as required. All packets received at the satellite from all beams are recovered and switched to their destination downlink beams per address-fields in the packet-header. Packets destined for same destination beam are grouped and transmitte
35、d in the downlink direction via very high-rate TDM carrier bursts. Both end-user and gateway terminal types dynamically soft-share the total available bandwidth as needed to support the traffic flow in each direction. 4.3 Air interface protocol architecture The air interface is logically divided int
36、o the P-interface and the U-interface: The P-interface is a peer-to-peer interface between the two STs. The U-interface is the interface between each ST and the satellite payload. Figure 4.3 illustrates the User plane (U-plane) architecture from the ST viewpoint. This architecture is derived from th
37、e general protocol architecture as defined in the BSM services and architectures report. ETSI ETSI TS 102 188-1 V1.1.2 (2004-07) 8 MEDIUM ACCESSCONTROLSATELLITE LINKCONTROLIP INTERWORKINGincl. PEPs (for TCP, DNS, HTTP)IPEthernetor USBPHYSICALMEDIUM ACCESSCONTROLPHYSICAL PHYSICALTo/fromHostTo/fromHos
38、tU-interfaceU-interfaceSATELLITE PAYLOADSATELLITE TERMINAL (ST) SATELLITE TERMINAL (ST)SI-SAPIPEthernetor USBMEDIUM ACCESSCONTROLSATELLITE LINKCONTROLIP PHYSICALSI-SAPINTERWORKINGincluding PEPs (for TCP, DNS, HTTP)T-interface T-interfaceP-interfaceLogical in terfacePhysical interfaceFigure 4.3: Air
39、interface architecture The ST provides air interface functions at all layers, and provides interworking between the air interface protocols and the user port protocols such as Ethernet or USB. The multi-part deliverable TS 102 188 defines the functions of the air interface physical layer - shown sha
40、ded in figure 4.3. 5 Physical layer (PHY) overview 5.1 General SATELLITE UPLINKFDMA-TDMA carriersSATELLITE DOWNLINKMultiple TDM carriersfor PTP services+Wide area TDM carriersfor broadcast servicesSatelliteSatellite Terminal (ST) Satellite Terminal (ST)Data packetsFigure 5.1: Physical layer overview
41、 ETSI ETSI TS 102 188-1 V1.1.2 (2004-07) 9 The uplink and downlink use different transmission formats as illustrated in figure 5.1: Satellite uplink: the satellite uplink consists of a set of Frequency and Time Division Multiple Access (FDMA-TDMA) carriers. Each uplink cell operates with a number of
42、 separate carriers. There are several alternative FDMA-TDMA carrier modes supporting user-data burst rates from the low kbps to multiple Mbps. Satellite downlink: the satellite downlink consists of a set of simultaneous Time Division Multiplex (TDM) carriers. Each TDM carrier contains the user traff
43、ic for a given geographic area and the set of TDM carriers can be redirected in every downlink time slot to service different downlink cells. The downlink capacity of each satellite can be allocated between point-to-point and broadcast services on an as-needed and/or time-of-day basis. 5.2 Services
44、provided by the physical layer The physical layer provides the following services and functions: The physical layer executes the initial acquisition and synchronization procedure with the network. The physical layer accepts outgoing packets from the MAC layer and transmits them on particular slots a
45、nd channels as instructed by MAC. The physical layer receives incoming packets and passes them to the MAC for filtering. The physical layer detects a dead link and informs the Radio Resource management layer accordingly. The physical layer adjusts transmission power based on the commands of the Radi
46、o Resource Management layer. 5.3 Functional description of the physical layer 5.3.1 General The physical layer is the lowest layer of the U-interface, as illustrated in figure 4.3. The functions of the physical layer are different for the uplink and downlink. The major functions are illustrated in f
47、igure 5.3.1. ETSI ETSI TS 102 188-1 V1.1.2 (2004-07) 10UPLINK DOWNLINK Part 3: Channel coding Part 2: Frame structure Part 4: Modulation Part 5: Radio transmission and reception t n Part 7: Synchronization Block interleaving Inner coding (convolutional) Downlink burst building Downlink modulation (Q
48、PSK) ST receiver Scrambling Assemble packets into code blocks Outer coding (Reed-Solomon) No interleaving Inner coding (Hamming) Uplink burst building Uplink modulation (OQPSK) Part6:Radio linkcontrolScrambling Timing and frequency control ST transmitter Assemble packets into code blocks Outer codin
49、g (Reed-Solomon) Figure 5.3.1: Physical layer functions A brief description of these physical layer functions is given in clauses 5.3.2, 5.3.3 and 5.3.4. The detailed specifications for these functions are given in the other parts of this multi-part deliverable, as referenced below. ETSI ETSI TS 102 188-1 V1.1.2 (2004-07) 115.3.2 Uplink 5.3.2.1 Overview of uplink data structures An overview of the uplink data structures is given in figure 5.3.2.1. Slot alignment time End guard time Ramp down time Ramp up time Start guard time TDMA burst Unique Word (UW) Multipl
