1、 ETSI TS 102 188-2 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 2: Frame structureETSI ETSI TS 102 188-2 V1.1.2 (2004-07) 2 Reference RTS/SES-00204-2 Keywords air interface,
2、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 Individual
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4、mat (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current
5、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 foreg
6、oing 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 registered by
7、 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 102 188-2 V1.1.2 (2004-07) 3 Contents Intellectual Property Rights4 Foreword.4 1 Scope 5 2 References 5 3 Definitions and abbreviations
8、.5 3.1 Definitions5 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 Slots8 5.2 Slot structure 9 5.2.1 Start guard 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
9、 period11 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 combinations .15 6.2 Slot structure 18 6.2.1 Beacon slot18 6.2.2 Shaped-broadcast, idle, and PTP slots 18 6.2.2.1 Beam settling time period
10、.19 6.3 Burst structure 20 6.3.1 Beacon burst .20 6.3.2 Shaped-broadcast, idle, and PTP bursts20 6.3.2.1 Unique Word field.22 6.3.2.2 Data field.23 6.3.2.2.1 Shaped-broadcast and PTP code blocks 24 6.3.2.2.2 Idle slot PN sequence 24 Annex A (informative): Bibliography.25 History 26 ETSI ETSI TS 102
11、188-2 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 these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 31
12、4: “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 (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy,
13、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 on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technica
14、l 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 the BSM Regenerative Satellite Mesh - A (RSM-A) air interface; Physical layer specification, as identified below: Part 1:
15、 “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: “Synchronization“. ETSI ETSI TS 102 188-2 V1.1.2 (2004-07) 5 1 Scope The present document defines the frame structure u
16、sed 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 Definitions For the purposes of the present document, the following terms and definitions apply: N
17、etwork 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 payload: part of the satellite that provides air in
18、terface 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 which application level programs are running
19、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 I In phase IP Internet Protocol kbps kilo bits per second (thousands of bits per
20、 second) LHCP Left Hand Circular Polarization LS Long SlotLSB Least Significant Bit Mbps Mega bits per second (millions of bits per second) MSB Most Significant Bit Msps Mega symbols per second (millions of symbols per second) NOCC Network Operations Control Centre OQPSK Offset Quaternary Phase Shif
21、t Keying PTP Point-To-Point PN Pseudo Noise Q Quadrature QPSK Quaternary Phase Shift Keying RHCP Right Hand Circular Polarization RSM Regenerative Satellite Mesh SLC Satellite Link Control SS Standard Slot ST Satellite Terminal ETSI ETSI TS 102 188-2 V1.1.2 (2004-07) 6 TDM Time Division Multiplexing
22、 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 DOWNLINK Part 3: Channel coding Part 2: Frame structure Part 4: Modu
23、lation Part 5: Radio transmission and reception tn Part 7: Synchronization Block interleaving Inner coding (convolutional) Downlink burst building Downlink modulation (QPSK) ST receiver Scrambling Assemble packets into code blocks Outer coding (Reed-Solomon) No interleaving Inner coding (hamming) Up
24、link burst building Uplink modulation (OQPSK) Part6:Radio link controlScrambling Timing and frequency control ST transmitter Assemble packets into code blocks Outer coding (Reed-Solomon) Figure 4: Physical layer functions The present document describes the frame structure - this group of functions i
25、s 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. ETSI ETSI TS 102 188-2 V1.1.2 (2004-07) 7 5 Uplink 5.1 Frame structure The uplink frame is 96 ms in duration, and is composed of a dea
26、d 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 defined in the R
27、SM-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 frame 3 1 32 Standard Slots per frame 3 2 code blocks per Slot f
28、or 16 Mbps carrier mode 4 code blocks per Slot for 2 Mbps carrier mode 1 code block per Slot for 512 kbps carrier mode 0 7 1 code block per Slot for 128 kbps carrier mode 8 Long Slots per frame Figure 5.1: Uplink frame structure 5.1.1 Dead time period The time duration and corresponding length in mo
29、dulated 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 kb
30、ps 153,6 520 5/6 10380 2 Mbps 153,6 2 1/12 106320 16 Mbps 153,6 16 2/3 1062 560 ETSI ETSI TS 102 188-2 V1.1.2 (2004-07) 8 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
31、slot numbering scheme is shown 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 symb
32、ols) Slot 0 (6 240 OQPSK symbols) 11,9808 ms 96 ms Slot 7 (6 240 OQPSK symbols) . 153,6 s Dead time (80 OQPSK symbols) Slot 0 (1 560 OQPSK symbols) 2,9952 ms Slot 31 (1 560 OQPSK symbols) . 153,6 s Dead time (320 OQPSK symbols) Slot 0 (6 240 OQPSK symbols) 2,9952 ms Slot 31 (6 240 OQPSK symbols) . 1
33、53,6 s sec Dead time (2 560 OQPSK symbols) Slot 0 (49 920 OQPSK symbols) 2,9952 msec Slot 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
34、 duration and corresponding length in modulated 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
35、 kbps 32 2,9952 520 5/6 1031 560 2 Mbps 32 2,9952 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
36、time period shown in table 5.1.1, slott is the 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. ETSI ETSI TS 102 188-2 V1.1.2 (2004-07) 9 5.2
37、 Slot structure An uplink TDMA time slot is composed of a start guard time 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 R amp down time
38、 End guard timeSlotalignment timeTime 9,6s 9,6 9,6 s 9,6 s s Figure 5.2: Uplink 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 th
39、e start guard time and the end guard time periods of the designated time slots. 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
40、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 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
41、 and corresponding length in modulated symbols of the ramp-up time period are 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 5/6 103
42、5 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. ETSI ETSI TS 102 188-2 V1.1.2 (2004-07) 10Table 5.2.2.2: Uplink slot ramp-up patterns Carrier mode Number of symbols Ramp-up pattern 128 kbps 5 11000 512 k
43、bps 5 11000 2 Mbps 20 11000011110000111100 16 Mbps 160 1100001111000011110000111100001111000011110000111100001111000011110000111100001111000011110000111100001111000011110000111100001111000011110000111100001111000011 5.2.3 Ramp-down time period The ST uses the ramp-down time period to control the tur
44、n-off of the radio, thereby controlling emissions. The time duration and corresponding length in modulated symbols of the ramp-down time period are defined in table 5.2.3.1. Table 5.2.3.1: Uplink slot ramp-down time period durations Carrier mode Time duration (s) Symbol rate (symbols/s) Time duratio
45、n (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-down patterns for I-channel and Q-channel are defined in table 5.2.3.2. Table 5.2.3.2: Uplink slot ramp-down patterns Carrier mode Number of symbols Ramp-down pattern
46、128 kbps 5 01111 512 kbps 5 01111 2 Mbps 20 001111000011110000 16 Mbps 160 1100001111000011110000111100001111000011110000111100001111000011110000111100001111000011110000111100001111000011110000111100001111000011110000111100001111000011 5.2.4 End guard time period The time designated as guard time is
47、 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 slots. The time duration and corresponding length in modulated symbols of the end guard
48、time period are defined in table 5.2.4. ETSI ETSI TS 102 188-2 V1.1.2 (2004-07) 11Table 5.2.4: Uplink slot end 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 512 kbps 9,6 520 5/6 1035 2 Mbps 9,6 2 1/12 10
49、620 16 Mbps 9,6 16 2/3 106160 5.2.5 Slot alignment time period The slot alignment time is added to force the time slots for 512 kbps, 2 Mbps and 16 Mbps to be of equal length and for the 128 kbps long slot to be four times longer than the other time slots. No data is transmitted during the slot alignment time. The time duration and corresponding length in modulated symbols of the slot alignment time period are defined in table 5.2.5. Table 5.2.5: Uplink slot alignment time period durations Carrier mode Time dura
