1、 TIA STANDARD Regenerative Satellite Mesh-A (RMS-A) Air Interface - Physical Layer Specification - Part 1: General Description TIA-1040.1.01 April 2005 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications sector of NOTICE TIA Engineering S
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16、ATIONS. TIA-1040.1.01 1Contents Intellectual Property Rights4 Foreword 4 1 Scope5 2 References 5 3 Definitions and abbreviations.5 3.1 Definitions. 5 3.2 Abbreviations 5 4 Air interface overview6 4.1 Network architecture. 6 4.1.1 Network elements 6 4.1.2 Network interfaces 7 4.2 Air interface overvi
17、ew 7 4.3 Air interface protocol architecture 7 5 Physical layer (PHY) overview8 5.1 General 8 5.2 Services provided by the physical layer . 9 5.3 Functional description of the physical layer. 9 5.3.1 General. 9 5.3.2 Uplink 11 5.3.2.1 Overview of uplink data structures . 11 5.3.2.2 Scrambling and pa
18、cket assembly 11 5.3.2.3 Coding 12 5.3.2.4 Frame structure 12 5.3.2.5 Burst building 13 5.3.2.6 Modulation. 13 5.3.2.7 Uplink carrier 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 Codin
19、g 16 5.3.3.4 Frame structure 16 5.3.3.5 Burst building 17 5.3.3.6 Modulation. 17 5.3.3.7 Downlink carrier modes 17 5.3.3.8 Downlink power control 18 5.3.4 Other physical layer functions 18 Annex A (informative): Bibliography.19 History 20 TIA-1040.1.01 2Intellectual Property Rights IPRs essential or
20、 potentially essential to the present document may have been declared to ETSI. The information pertaining to these 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 Esse
21、ntial, 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 (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI.
22、 No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates 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 Sate
23、llite Earth Stations and Systems (SES). The present document is part 1 of a multi-part deliverable covering the 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 cod
24、ing“; Part 4: “Modulation“; Part 5: “Radio transmission and reception“; Part 6: “Radio link control“; Part 7: “Synchronization“. TIA-1040.1.01 31 Scope The present document is an introduction to the physical layer specification for the SES BSM Regenerative Satellite Mesh - A (RSM-A) air interface fa
25、mily. It consists of a general description of the organization of the physical layer 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
26、, the following terms and definitions apply: Network Operations Control Centre (NOCC): 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 paylo
27、ad: part of the satellite that provides air interface functions NOTE: The satellite 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
28、 which application level programs are running NOTE: It may be connected directly to 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
29、 DLPC DownLink Power Control DNS Directory Name Server FDMA Frequency Division Multiple 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
30、bits per second) NOCC Network Operations Control Centre OQPSK Offset Quaternary Phase Shift Keying PEP Performance Enhancing Proxy PHY PHYsical PN Pseudo NoisePTP Point-To-Point QPSK Quaternary Phase Shift Keying RS Reed-Solomon RSM Regenerative Satellite Mesh TIA-1040.1.01 4SLC Satellite Link Contr
31、ol ST Satellite Terminal TCP Transmission Control Protocol TDM Time Division Multiplexing TDMA Time Division Multiple Access ULPC UpLink Power Control USB Universal Serial BusUW Unique Word 4 Air interface overview 4.1 Network architecture 4.1.1 Network elements Figure 4.1.1 illustrates the network
32、architecture from the satellite terminal viewpoint and also shows the different interfaces as seen by the satellite terminal. SatellitepayloadSatellitepayloadNetwork OperationsControl Centre(NOCC)Network OperationsControl Centre(NOCC)U I/FN I/FSatelliteTerminalSatelliteTerminalTerrestrialHostTerrest
33、rialHostT I/FSatelliteTerminalSatelliteTerminalTerrestrialHostTerrestrialHostU I/FP I/FN I/FLogical interfacePhysical 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 ter
34、minal to an IP network and also provides element management 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 s
35、witch that provides direct unicast and multicast communication 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
36、application level programs are running. It may be connected 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. TIA-1040.1.01 54.1.2 Network int
37、erfaces The network interfaces 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 si
38、gnalling go over this interface. 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 in
39、terfaces. N interface: this 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 o
40、verview All satellite terminals 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 b
41、eams that provide coverage 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 satell
42、ite and NOCC manage the assignment 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
43、 are grouped and transmitted 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 interfa
44、ce is logically divided into 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 arch
45、itecture is derived from the general protocol architecture as defined in the BSM services and architectures report. TIA-1040.1.01 6MEDIUM ACCESSCONTROLSATELLITE LINKCONTROLIP INTERWORKINGincl. PEPs (for TCP, DNS, HTTP)IPEthernetor USBPHYSICALMEDIUM ACCESSCONTROLPHYSICAL PHYSICALTo/fromHostTo/fromHos
46、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 interfacePhysical interfaceFigure 4.3: Air i
47、nterface 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 shad
48、ed 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
49、TIA-1040.1.01 7The 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 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 traffic for a given
