ETSI TS 102 721-3 V1.2.1 (2013-08)

Satellite Earth Stations and Systems (SES); Air Interface for S-band Mobile Interactive Multimedia (S-MIM); Part 3: Physical Layer Specification, Return Link Asynchronous Access

RTS/SES-00335

General Information

• Status: Published
• Publication Date: 07-Aug-2013
• Technical Committee: SES SCN - Satellite Communications and Navigation
• Current Stage: 12 - Completion
• Due Date: 12-Aug-2013
• Completion Date: 08-Aug-2013
• Mandate: M/496

Standards Content (Sample)

ETSI TS 102 721-3 V1.2.1 (2013-08)






Technical Specification
Satellite Earth Stations and Systems (SES);
Air Interface for S-band Mobile Interactive Multimedia (S-MIM);
Part 3: Physical Layer Specification,
Return Link Asynchronous Access

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2 ETSI TS 102 721-3 V1.2.1 (2013-08)



Reference
RTS/SES-00335
Keywords
MSS, satellite
ETSI
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ETSI

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3 ETSI TS 102 721-3 V1.2.1 (2013-08)
Contents
Foreword . 5
Introduction . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 6
3 Definitions, symbols and abbreviations . 7
3.1 Definitions . 7
3.2 Symbols . 7
3.3 Abbreviations . 8
4 General description. 8
4.1 Relationship to other layers . 9
4.1.1 General Protocol Architecture . 9
4.1.2 Services provided to higher layers . 10
4.2 Transmitter functional architecture . 10
4.3 Channel descriptions . 10
4.3.1 Transport channel . 10
4.3.2 Physical channels . 10
5 Physical Channel Structure . 11
5.1 PDCH structure . 11
5.1.1 CRC format . 12
5.2 PCCH structure . 13
5.2.1 Pilot symbols format . 13
5.2.2 Transport Format Indication format . 14
5.3 Transport-to-Physical Channel Mapping . 14
6 Channel Coding and Interleaving . 15
6.1 Channel Coding . 15
6.1.1 Constituent code . 15
6.1.2 Trellis termination for turbo coder . 16
6.1.3 Turbo code internal interleaver . 16
6.1.3.1 Bits-input to rectangular matrix . 17
6.2 Intra-row and inter-row permutations. 18
6.2.1 Bits-output from rectangular matrix with pruning . 19
6.2.2 Rate matching . 20
6.3 Channel Interleaving . 21
7 Spreading and Modulation . 23
7.1 PDCH and PCCH spreading . 23
7.1.1 PDCH and PCCH channelization . 24
7.1.2 PDCH and PCCH scrambling . 25
7.2 Up-Link Burst Preamble . 26
7.2.1 Sequence s . 27
1
7.2.2 Sequence s . 27
2
7.2.2.1 SF = 16 . 27
7.2.2.2 SF = 128 . 28
7.2.2.3 SF = 256 . 28
7.3 Modulation . 29
8 Radio transmission . 29
8.1 Frequency bands and channel arrangement . 29
8.2 Stability and accuracy requirements . 29
8.2.1 Frequency and symbol timing stability and accuracy . 30
8.2.2 Power stability and accuracy . 30
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4 ETSI TS 102 721-3 V1.2.1 (2013-08)
8.3 Transmitter characteristics. 30
8.3.1 Power output characteristics and power class . 30
8.3.2 Transmit polarization . 30
8.3.2.1 Satellite Access . 30
8.3.2.2 Terrestrial Access . 31
8.3.3 Unwanted emissions . 31
8.4 Transmit procedure. 31
8.5 Tx/Rx states . 32
9 Physical layer measurements . 33
Annex A (informative): Generation of Complex Complementary Golay Codes . 34
History . 35

ETSI

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5 ETSI TS 102 721-3 V1.2.1 (2013-08)
Intellectual Property Rights
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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 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
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Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
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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 3 of a multi-part deliverable. Full details of the entire series can be found in part 1 [i.11].
Introduction
The S-MIM system specified herein is designed to provide:
• Interactive mobile broadcast services enhancing DVB-SH services.
• Messaging services for handhelds and vehicular terminals, capable of serving millions of terminals due to a
novel optimized radio-interface in the RTN link.
• Real-time emergency services such as voice and file transfer, mainly addressing institutional users
on-the-move such as fire brigades, civil protection, etc.
Inside the S-band, the 2 GHz MSS band is of particular interest for interactive multimedia, since it allows two-way
transmission. Typically, the DVB-SH standard [i.7] is applied for broadcast transmission; ETSI SDR [i.3] or
DVB-NGH [i.8] standards are other alternatives. Essential requirements under the R&TTE directive are covered by the
harmonized standard EN 302 574 [i.4], [i.5] and [i.6].
The technology applied has been developed in the framework of the ESA funded project "DENISE" (ESTEC/Contract
Number 22439/09/NL/US).
ETSI

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6 ETSI TS 102 721-3 V1.2.1 (2013-08)
1 Scope
The present document specifies the S-MIM (S-band Mobile Interactive Multimedia) system in which a standardized
S-band satellite mobile broadcast system is complemented by the addition of a return channel
The present document is part 3 of the multi-part deliverable and concerns aspects of the air interface for the S-band
Mobile Interactive Multimedia (S-MIM) system, and in particular it specifies the Physical Layer for Return Link
Asynchronous Access.
The other parts are listed in the foreword of part 1 [i.11].
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are necessary for the application of the present document.
[1] ETSI TS 102 721-6: "Satellite Earth Stations and Systems (SES); Air interface for S-band Mobile
Interactive Multimedia (S-MIM); Part 6: Protocol Specifications, System Signalling".
2.2 Informative references
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] IEEE Journal on Selected Areas in Communications: "Bandlimited Quasi-Synchronous CDMA: A
Novel Satellite Access Technique for Mobile and Personal Communications Systems", R. De
Gaudenzi, C. Elia, R. Viola, 1992.
[i.2] Patent: US201 010054131 A 1: "Methods, Apparatuses and System for Asynchronous Spread-
Spectrum Communication".
[i.3] ETSI EN 302 550 (all parts and sub-parts): "Satellite Earth Stations and Systems (SES); Satellite
Digital Radio (SDR) Systems".
[i.4] ETSI EN 302 574-1: "Satellite Earth Stations and Systems (SES); Harmonized standard for
satellite earth stations for MSS operating in the 1 980 MHz to 2 010 MHz (earth-to-space) and
2 170 MHz to 2 200 MHz (space-to-earth) frequency bands; Part 1: Complementary Ground
Component (CGC) for wideband systems: Harmonized EN covering the essential requirements of
article 3.2 of the R&TTE Directive".
[i.5] ETSI EN 302 574-2: "Satellite Earth Stations and Systems (SES); Harmonized standard for
satellite earth stations for MSS operating in the 1 980 MHz to 2 010 MHz (earth-to-space) and
2 170 MHz to 2 200 MHz (space-to-earth) frequency bands; Part 2: User Equipment (UE) for
wideband systems: Harmonized EN covering the essential requirements of article 3.2 of the
R&TTE Directive".
ETSI

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7 ETSI TS 102 721-3 V1.2.1 (2013-08)
[i.6] ETSI EN 302 574-3: "Satellite Earth Stations and Systems (SES); Harmonized standard for
satellite earth stations for MSS operating in the 1 980 MHz to 2 010 MHz (earth-to-space) and
2 170 MHz to 2 200 MHz (space-to-earth) frequency bands; Part 3: User Equipment (UE) for
narrowband systems: Harmonized EN covering the essential requirements of article 3.2 of the
R&TTE Directive".
[i.7] ETSI TS 102 585: "Digital Video Broadcasting (DVB); System Specifications for Satellite
services to Handheld devices (SH) below 3 GHz".
[i.8] DVB BlueBook A160: "Next Generation broadcasting system to Handheld, physical layer
specification (DVB-NGH)".
[i.9] ETSI TS 125 212: "Universal Mobile Telecommunications System (UMTS); Multiplexing and
channel coding (FDD) (3GPP TS 25.212)".
[i.10] ETSI TS 125 213: "Universal Mobile Telecommunications System (UMTS); Spreading and
modulation (FDD) (3GPP TS 25.213)".
[i.11] ETSI TS 102 721-1: "Satellite Earth Stations and Systems (SES); Air Interface for S-band Mobile
Interactive Multimedia (S-MIM); Part 1: General System Architecture and Configurations".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
2 GHz MSS band: 1 980 MHz to 2 010 MHz (earth-to-space) and 2 170 MHz to 2 200 MHz (space-to-earth) frequency
bands
NOTE: These paired bands are assigned to MSS.
architecture: abstract representation of a communications system
NOTE: Three complementary types of architecture are defined:
Functional Architecture: the discrete functional elements of the system and the associated logical
interfaces.
Network Architecture: the discrete physical (network) elements of the system and the associated
physical interfaces.
Protocol Architecture: the protocol stacks involved in the operation of the system and the
associated peering relationships.
collector: terrestrial components that "collect" return link transmissions from terminals and forward them towards the
ground segment
control plane: plane that has a layered structure and performs the call control and connection control functions; it deals
with the signalling necessary to set up, supervise and release calls and connections
repeater: terrestrial components that (mainly) repeat the satellite signal in the forward link
S-band: equivalent to 2 GHz MSS band
3.2 Symbols
For the purposes of the present document, the following symbols apply:
N Single-sided noise power spectral density
0
I Single-sided interference power spectral density
0
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8 ETSI TS 102 721-3 V1.2.1 (2013-08)
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ACK Acknowledgement signalling
ACLR Adjacent Channel Leakage power Ratio
C number of Columns
C Received signal (carrier) power
CDMA Code Division Multiple Access
CGC Complementary Ground Component
CRC Cyclic Redundancy Check
DL Down-Link
DVB-SH Digital Video Broadcasting, Satellites services to Handhelds
EIRP Effective Isotropic Radiated Power
FEC Forward Error Correction
FL Forward-Link
GF Gallois Field
GW Gateway
LOS Line Of Sight
ML Maximal Length
MSB Most Significant Bit
MSS Mobile Satellite Services
OVSF Orthogonal Variable Spreading Factor
PCCC Parallel Concatenated Convolutional Code
PCCH Physical Control Channel
PDCH Physical Data Channel
PN Pseudo-Noise
PPM Parts Per Million
RACH Random Access Channel
RF Radio Frequency
RL Return-Link
RTN Return (link)
Rx Receive
SAT SSA Access Table
SCT SSA Configuration Table
SDR Satellite Digital Radio
SDT SSA Dynamic Configuration Table
SF Spreading Factor
S-MIM S-band Mobile Interactive Multimedia
SNR Signal to Noise Ratio
SRRC Square Root Raised Cosine
SSA Spread Spectrum Aloha
TFI Transport Format Indication
TTI Transmission Time Interval
Tx Transmitter
UL Up-Link
ULB Up-Link Burst
WCDMA Wideband CDMA
4 General description
The present document specifies the physical layer for the Asynchronous Access option of the Return Link using the
Spread Spectrum Aloha (SSA) technique [i.1] and [i.2].
The present document has similarities with 3GPP specifications [i.9], [i.10] and the differences are described.
The present document covers the Return-Link (RL) satellite transmission and the Up-Link (UL) transmission to the
terrestrial collectors. Although different configurations and parameters may apply to the RL and to UL, the radio
interface is in both cases the one defined in the present document.
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9 ETSI TS 102 721-3 V1.2.1 (2013-08)
S-MIM asynchronous access is intended for access to interactive messaging services, since it does not require
coordination between users thus minimizing the signalling overhead required for the access control. Other advantages
of S-MIM asynchronous access are:
• Ability for the space segment to operate with full frequency reuse. This will contribute to further improvement
of the system efficiency.
• Feasibility of band sharing with other access schemes due to the spread spectrum characteristics.
4.1 Relationship to other layers
4.1.1 General Protocol Architecture
The overall protocol architecture for the return link of S-MIM asynchronous access is shown in Figure 4.1.
USER PLANE CONTROL PLANE MANAGEMENT PLANE

/
P
t
s M
a
D
c
Subscriber Service
/
a
t
P
a Management Protection
D M

N
P
I
S
P
C Network /
Traffic
T
/
P Terminal
I
P Monitoring
D Management
U
Header
Header IPsec
NCC UsCC
Signalling
Compression Compression Authentication
Management
Control Control
C
L
R
ARQ
Mobility
Mutual
Transmission Management
r ACK Mode C-ACK Mode U-ACK Mode
e Management
Authentication
y
& Congestion
Mode
a
L Control
Control

k
n
i
L
Encapsulation &
LL
RLE
Authentication
Addressing
C
Control
A
M
Encryption (LL)
EC NEC
Modulation &
Y
H RACH
Transmission
P
PCCH PDCH

Figure 4.1: Protocol Architecture for the Asynchronous Return Link
The circles between different layer/sub-layers indicate Service Access Points (SAPs).
The physical layer provides an interface to the Medium Access Control (MAC) sub-layer via Transport channel(s). A
transport channel is characterized by how and which information is transferred over the radio interface.
Physical Channels are defined in the physical layer and are characterized by the physical resources (time, frequency,
code, and space) that are used to transport data/control/signalling to/from a single user or a multitude of users.
The Control Plane is concerned with all aspects of signalling, for example the signalling of the Return Link scrambling
sequence to the user terminal as described in TS 102 721-6 [1].
The present document is concerned with the Physical Layer.
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10 ETSI TS 102 721-3 V1.2.1 (2013-08)
4.1.2 Services provided to higher layers
The physical layer offers data transport services to higher layers. The physical layer is expected to perform the
following functions in order to provide the data transport service:
- Error detection on transport channel and indication to higher layers.
- FEC encoding/decoding of transport channels.
- Rate matching of coded transport channel to physical data channel.
- Mapping of coded transport channel on physical data channel.
- Power weighting and combining of physical channels.
- Modulation and spreading/demodulation and de-spreading of physical channels.
- Frequency and time (chip, bit, burst) synchronization.
- Radio characteristics measurements and indication to higher layers (for further study).
- RF processing.
4.2 Transmitter functional architecture
In the transmission direction Physical Layer functional block diagram is shown in Figure 4.2.

Figure 4.2: Transmitter Functional Block Diagram
4.3 Channel descriptions
4.3.1 Transport channel
There is a single transport channel: the Random Access Channel (RACH). The RACH is characterized by limited size
data burst length, a collision risk and by the use of open loop power control.
Three possible nominal sizes of the RACH data burst length are supported, namely 300, 600 and 1 200 bits. Depending
on the effective size of the RACH data burst length and of the size of the optional CRC, rate matching will be
performed after FEC encoding.
NOTE: It is recommended to keep the effective size of the RACH data burst length within ±10 % of the nominal
sizes.
4.3.2 Physical channels
Two physical channels are defined, namely the PDCH (Physical Data Channel) used to carry the RACH data burst and
the PCCH (Physical Control Channel) used to carry physical layer signalling information. The PDCH and the PCCH are
I/Q code multiplexed to form an Up-Link Burst (ULB), composed of three parts (Figure 4.3):
• a preamble;
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11 ETSI TS 102 721-3 V1.2.1 (2013-08)
• a Physical Data Channel (PDCH), uniquely determined by its chip rate, spreading factor and data burst length
as detailed in clause 5.1;
• the Physical Control Channel (PCCH), uniquely determined by its chip rate as detailed in clause 5.2.
The preamble is transmitted before the start of the PDCH and PCCH.

Figure 4.3: The Up-Link Burst and its constituent parts
The PDCH will carry the RACH data burst followed by an optional CRC defined in clause 5.1.1.
The PCCH carries physical layer signalling and reference symbols to allow coherent demodulation of the PDCH
channel. The physical layer signalling conveys the Transport Format Indication (TFI) to the receiving side as defined in
clause 5.2.1.
For Radio Channel details see clause 8.
5 Physical Channel Structure
5.1 PDCH structure
As shown in Figure 5.1, the PDCH data burst (after channel encoding according to clause 6.1), is divided into a variable
number of frames ranging from 3 (Option 1) up to 24 (Option 4). Each frame has a fixed duration of 10 ms. The PDCH
length (in time or, equivalently, in frames) is indicated with the term TTI (Transmission Time Interval).

Figure 5.1: PDCH Composition
Figure 5.2 shows the structure of the 10 ms frame, which is split into 15 slots, each of length T = 0,667 ms. Each slot
slot
k
consists of 10 × 2 bits, where k=0 or 1 (k only equal to 0 for chip rate 240 kchip/s).
The set of allowed parameters of the PDCH is reported in Table 5.1. Note that the number of info bits reported in
Table 5.1 is only indicative. Exploiting the rate matching mechanism, the code rate can be changed to accommodate
variations in the RACH data burst length without impacting the PDCH data burst length. Clearly for not penalizing
system performance it is expected that the code rate is not increased significantly above the 1/3 nominal code rate.
Rate matching as specified in clause 6.2 may thus be used to adapt the code rate to the RACH data burst length, as
defined in TS 102 721-6 [1].
ETSI

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12 ETSI TS 102 721-3 V1.2.1 (2013-08)

Figure 5.2: Structure of the PDCH and PCCH
Table 5.1: Allowed PDCH configurations
PDCH TFI Chip rate Ch. Bit SF Info Bits/ Ch. Bits/ Ch. Bits/ Ch. Bits/ Data Burst
Configuration ID Code (kchip/s) Rate Burst Burst Frame Slot Length
(bin.) (kbps) (Frames)
CR SF DBL 00000 3 840 15 256 1 200 3 600 150 10 24
3 840 256 24
CR SF DBL 00001 3 840 15 256 600 1 800 150 10 12
3 840 256 12
CR SF DBL
00010 3 840 15 256 300 900 150 10 6
3 840 256 6
CR SF DBL 00011 3 840 30 128 1 200 3 600 300 20 12
3 840 128 12
CR SF DBL 00100 3 840 30 128 600 1 800 300 20 6
3 840 128 6
CR SF DBL 00101 3 840 30 128 300 900 300 20 3
3 840 128 3
CR SF DBL 00110 1 920 15 128 1 200 3 600 150 10 24
1 920 128 24
CR SF DBL 00111 1 920 15 128 600 1 800 150 10 12
1 920 128 12
CR SF DBL 01000 1 920 15 128 300 900 150 10 6
1 920 128 6
CR SF DBL 01001 1 920 30 64 1 200 3 600 300 20 12
1 920 64 12
CR SF DBL 01010 1 920 30 64 600 1 800 300 20 6
1 920 64 6
CR SF DBL 01011 1 920 30 64 300 900 300 20 3
1 920 64 3
CR SF DBL 01100 240 15 16 1 200 3 600 150 10 24
240 16 24
CR SF DBL 01101 240 15 16 600 1 800 150 10 12
240 16 12
CR SF DBL 01110 240 15 16 300 900 150 10 6
240 16 6

5.1.1 CRC format
The PDCH includes an optional 16 bit or 8 bit CRC. If a CRC is used the parity bit
...