1、 TIA STANDARD Regenerative Satellite Mesh-A (RMS-A) Air Interface - Physical Layer Specification - Part 2: Frame Structure TIA-1040.1.02 April 2005 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications sector of NOTICE TIA Engineering Stand
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16、NS. TIA-1040.1.02 1Contents Intellectual Property Rights4 Foreword 4 1 Scope5 2 References5 3 Definitions and abbreviations 5 3.1 Definitions. 5 3.2 Abbreviations 5 4 General .6 5 Uplink.7 5.1 Frame structure . 7 5.1.1 Dead time period . 7 5.1.2 TDMA Slots 8 5.2 Slot structure . 9 5.2.1 Start guard
17、time period 9 5.2.2 Ramp-up time period. 9 5.2.3 Ramp-down time period 10 5.2.4 End guard time period. 10 5.2.5 Slot alignment time period 11 5.3 Burst structure . 11 5.3.1 Unique Word field. 12 5.3.2 Data field . 13 6 Downlink14 6.1 Frame structure . 14 6.1.1 Slot transmission rates. 15 6.1.2 Slot
18、combinations 15 6.2 Slot structure . 18 6.2.1 Beacon slot 18 6.2.2 Shaped-broadcast, idle, and PTP slots 18 6.2.2.1 Beam settling time period . 19 6.3 Burst structure . 20 6.3.1 Beacon burst 20 6.3.2 Shaped-broadcast, idle, and PTP bursts 20 6.3.2.1 Unique Word field. 22 6.3.2.2 Data field . 23 6.3.
19、2.2.1 Shaped-broadcast and PTP code blocks 24 6.3.2.2.2 Idle slot PN sequence 24 Annex A (informative): Bibliography.25 History26 TIA-1040.1.02 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to t
20、hese 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. Late
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22、 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 2 of a multi-part deliverable covering th
23、e 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:
24、“Synchronization“. TIA-1040.1.02 31 Scope The present document defines the frame structure used within the SES BSM Regenerative Satellite Mesh - A (RSM-A) air interface family. It includes frame, time slot, and burst structure definition. 2 References Void. 3 Definitions and abbreviations 3.1 Defini
25、tions For the purposes of the present document, 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 res
26、ource management functionality satellite payload: 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
27、 the user premises terrestrial host: entity on 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 S
28、hift Keying I In phase IP Internet Protocol kbps kilo bits per second (thousands of bits per second) LHCP Left Hand Circular Polarization LS Long Slot LSB Least Significant Bit Mbps Mega bits per second (millions of bits per second) MSB Most Significant Bit Msps Mega symbols per second (millions of
29、symbols per second) NOCC Network Operations Control Centre OQPSK Offset Quaternary Phase Shift Keying PTP Point-To-PointPN Pseudo Noise Q Quadrature QPSK Quaternary Phase Shift Keying RHCP Right Hand Circular Polarization RSM Regenerative Satellite Mesh SLC Satellite Link Control SS Standard SlotST
30、Satellite Terminal TIA-1040.1.02 TDM Time Division Multiplexing TDMA Time Division Multiple Access TIP Transmission Information Packet UW Unique Word 4 General The functions of the physical layer are different for the uplink and downlink. The major functions are illustrated in figure 4. UPLINK DOWNL
31、INKPart 3: Channel coding Part 2: Frame structure Part 4: Modulation Part 5: Radio transmission and reception tnPart 7: Synchronization Block interleavingInner coding (convolutional)Downlink burstbuildingDownlink modulation (QPSK)ST receiverScramblingAssemble packetsinto code blocksOuter coding (Ree
32、d-Solomon)No interleavingInner coding(hamming)Uplink burstbuildingUplink modulation(OQPSK)Part6:Radio linkcontrolScramblingTiming and frequency controlST transmitterAssemble packetsinto code blocksOuter coding (Reed-Solomon)Figure 4: Physical layer functions The present document describes the frame
33、structure - this group of functions is highlighted in figure 4. The uplink frame structure requirements are described in clause 5 and the downlink frame structure requirements are described in clause 6. TIA-1040.1.02 55 Uplink 5.1 Frame structure The uplink frame is 96 ms in duration, and is compose
34、d of a dead time period followed by a fixed number of time slots for code block transmission as shown in figure 5.1. The number of time slots is a function of the carrier mode. NOTE: The uplink carrier modes in operation at any given time is defined by system information broadcast messages as define
35、d in the RSM-A SMAC/SLC layer specification. The two general types of TDMA slot formats are the Standard Slot (SS) and the Long Slot (LS). The beginning of the uplink frame is the start of the dead time period as shown in figure 5.1. 0 96 ms per frame3132 Standard Slots per frame3 2 code blocks per
36、Slot for 16 Mbps carrier mode4 code blocks per Slot for 2 Mbps carrier mode1 code block per Slot for 512 kbps carrier mode0 7 1 code block per Slot for 128 kbps carrier mode8 Long Slots per frameFigure 5.1: Uplink frame structure 5.1.1 Dead time period The time duration and corresponding length in m
37、odulated symbols of the dead time period are defined in table 5.1.1. The ST shall not transmit during the dead time period. Table 5.1.1: Uplink frame dead time period durations Carrier mode Time duration (s) Symbol rate (symbols/s) Time duration (modulated symbols) 128 kbps 153,6 520 5/6 10380 512 k
38、bps 153,6 520 5/6 10380 2 Mbps 153,6 2 1/12 106320 16 Mbps 153,6 16 2/3 1062 560 TIA-1040.1.02 5.1.2 TDMA Slots The uplink frame shall consist of 32 standard slots for the 16 Mbps, 2 Mbps and 512 kbps carrier modes, and 8 long slots for the 128 kbps carrier mode. The time slot numbering scheme is sh
39、own in figure 5.1.2. Standard and long slots are not mixed within an uplink frame on a given carrier. All time slots within an uplink frame belong to the same carrier mode (i.e. 512 kbps slots cannot be intermixed with 2 Mbps slots within a frame). Dead time (80 OQPSK symbols) Slot 0(6 240 OQPSK sym
40、bols)11,9808 ms96 msSlot 7 (6 240 OQPSK symbols). 153,6 s Dead time (80 OQPSK symbols) Slot 0(1 560 OQPSK symbols)2,9952 msSlot 31 (1 560 OQPSK symbols). 153,6 s Dead time (320 OQPSK symbols) Slot 0(6 240 OQPSK symbols)2,9952 msSlot 31 (6 240 OQPSK symbols). 153,6 s sec Dead time (2 560 OQPSK symbol
41、s) Slot 0(49 920 OQPSK symbols)2,9952 msecSlot 31 (49 920 OQPSK symbols). 153,6 s Carrier mode Long Slot 128 kbps Standard Slot 512 kbps Standard Slot 2 Mbps Standard Slot 16 Mbps Beginning of uplink frame Figure 5.1.2: Uplink TDMA slot definition The time duration and corresponding length in modula
42、ted symbols of each uplink time slot are defined in table 5.1.2. Table 5.1.2: Uplink frame TDMA slot durations Carrier mode Slots per frame Time duration (ms) Symbol rate (symbols/s) Time duration (modulated symbols) 128 kbps 8 11,9808 520 5/6 1036 240 512 kbps 32 2,9952 520 5/6 1031 560 2 Mbps 32 2
43、,9952 2 1/12 1066 240 16 Mbps 32 2,9952 16 2/3 10649 920 The start of any time slot relative to the start of an uplink frame is according to the following relation: ()slotslotNttN +=slot timedeadstart Slot where timedeadt is the time duration for the dead time period shown in table 5.1.1, slott is t
44、he time duration for each slot period as shown in table 5.1.2, and slotN is the slot designator number. The slot designator number starts at 0 and ends at 31 and 7 for the short slot and long slot respectively. TIA-1040.1.02 75.2 Slot structure An uplink TDMA time slot is composed of a start guard t
45、ime period, a ramp-up time period, a TDMA burst, a ramp-down time period, an end guard time period, and a slot alignment time period, as shown in figure 5.2. TDMA burst Start guard time TDMA time slot Ramp up time Ramp down time End guardtimeSlotalignment timeTime 9,6 s 9,6 9,6s9,6ss Figure 5.2: Upl
46、ink slot structure 5.2.1 Start guard time period The time designated as guard time is used to prevent interference in time between adjacent time slots due to arrival uncertainty. Uplink TDMA bursts are transmitted between the start guard time and the end guard time periods of the designated time slo
47、ts. The time duration and corresponding length in modulated symbols of the start guard time period are defined in table 5.2.1. Table 5.2.1: Uplink slot start guard time period durations Carrier mode Time duration (s) Symbol rate (symbols/s) Time duration (modulated symbols) 128 kbps 9,6 520 5/6 1035
48、 512 kbps 9,6 520 5/6 1035 2 Mbps 9,6 2 1/12 10620 16 Mbps 9,6 16 2/3 106160 5.2.2 Ramp-up time period The ST uses the ramp-up time period to control the turn-on of the radio, thereby controlling emissions. The time duration and corresponding length in modulated symbols of the ramp-up time period ar
49、e defined in table 5.2.2.1. Table 5.2.2.1: Uplink slot ramp-up time period durations Carrier mode Time duration (s) Symbol rate (symbols/s) Time duration (modulated symbols) 128 kbps 9,6 520 5/6 1035 512 kbps 9,6 520 5/6 1035 2 Mbps 9,6 2 1/12 10620 16 Mbps 9,6 16 2/3 106160 The ramp-up and ramp-down patterns for I-channel and Q-channel are defined in table 5.2.2.2. TIA-1040.1.02 Table 5.2.2.2: Uplink slot ramp-up patterns Carrier mode Number of symbols Ramp-up pattern 128 kbps 5 11000 512 kbps 5 11000 2 Mbps 20 11000011110000111100 16 Mbp
