3-11 Access Scheme Se
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SkyEdge Inbound Access Schemes Name and title of the presenter, Date
1
SkyEdge Inbound Access Scheme Why are we dealing with Access Schemes?
Reducing OPEX – efficient use of space segment Supporting different applications/needs in one network Improving and controlling Network behavior
SkyEdge Family Hub
2
SkyEdge Access Schemes SkyEdge supports a variety of access schemes and channel types
The aim is providing highest adaptability to different network scenarios and customer needs
The network designer defines the inbound channel scheme according to traffic assumptions and desired network behavior
Flexibility – Only a combination of different channel types on one network can provide a good solution to accommodate different applications and services 3
Main highlights Combination of TDMA and FDM -> FTDMA High utilization DAMA – Dynamic Assigned Multiple Access Sharing of resources (opposed to PAMA) Slotted ALOHA Access Twice more utilized than pure ALOHA (36% to 18%)
4
TDMA/MF-TDMA Satellite Access Schemes
SkyEdge MF-TDMA
TDMA
713
155 25
55
103
163
32
76
134
180
82 55
148 103
198 163
76
134
180
2
25 32
155
851 426 422
851 426 851 426
713 155 422
851 426 851 713 422
25
55
2
82
155 851
163
851 477
198
148
Time
Time
Time
103
155
Time
422
51-100
101-150
851 477
713
155 851 477 Dedicated Access Channels
200 - 1
151-200
Each frequency slot serves a group of VSATs More adapted to low bit-rates with low variability and well known applications ■ low utilization ■ ■
851 477
713 422
Time
1-50
Frequency
Complete bandwidth available to all sites More adapted to variable bit-rates and variety of applications ■ high utilization ■ ■
5
D-TDMA/MF-TDMA Satellite Access Schemes
SkyEdge MF-TDMA
D-TDMA
713
155 25 32 2 27 8 32
3 22 4 23 1 22
27 39 12 27 15 27
15 33 9 21 11 33
155
851 426 422
Frequency
851 426 851 426
713 155 422
851 426 851
8
1
713 422
15
11
155 851 851 477 155
Time
Time
Time
Time
422 Time
1-5
6-10
11-15
713 422
851 477
713
155 851 477 Dedicated Access Channels
1 - 200
16-20
Each frequency slot serves a group of VSATs More adapted to constant bit-rates with low variability and well known applications ■ Wasted BW when no traffic ■ Not scalable ■ ■
851 477
Complete bandwidth available to all sites More adapted to variable bit-rates and variety of applications ■ Efficient when no traffic ■ Very scalable 6 ■ ■
SkyEdge – Access Scheme I RA – Random Access – best for short transactional applications lowest latency – ping time as low as 600 msec
collision Time
Frequency CRA – Collision Reduction Algorithm – managing the busy VSATs by distributing them among different channels (avoid two busy VSATs on the same channel group)
7
SkyEdge – Access Scheme II DA – Dedicated Access Channels (and Partial DA) Collisionfree channel !
Time
allocation
ADA Triggers • TCP/UDP port number RA VDA = Voice DA – best voice performance
RA
DA
Trigger – ADA request
Frequency
• IP Address source/dest • IB Rate of Traffic (ROT) • Queue threshold • Permanent DA
8
SkyEdge – Access Scheme III GA – Guaranteed Access Channels VDA – Voice Dedicated Access Separation between Voice and Data – guarantees predictable QoS for Voice at all times (according GOS) Time
allocation
RRA
GA
Requests for Transmissions are done here
GA
VDA
Dedicated Voice Access
GA provides 25% better space utilization over an RA network
Frequency
9
VDA – best support for voice Circuit switched Utilization Lowest jitter Low delay Low BW per call Controlled Quality
10
SkyEdge – Access Scheme III Adding an RA channel to GA environment to enjoy reduced delay (Rel 4.0)
GA – Guaranteed Access Channels
Time
allocation
RRA
GA
Requests for Transmissions are done here
GA
VDA
RA
Dedicated Voice Access
Frequency
11
SkyEdge – Access Scheme Concepts IV Mesh Channel – Transmission between VSATs
Mesh channels reduce space segment by eliminating satellite hops Mesh channels provide connections with half the latency as opposed to star channels
Time
RRA
GA
GA
Star – VSAT to Hub
VDA
MVDA
Frequency
VSAT to VSAT 12
Dividing the Inbound into separate bands Inbound channels can be divided to 8 groups Each group is configured independently (access, rates)
Value to the operator – Support a shared Hub service or adapt better to a network with different services.
Example Internet Residential service - 128 kbps channels, GA CDMA backhaul – 512 kbps channels, RA
13
Rele
Multiple channel bit rates in one band
ase 4
.0
The SkyEdge Hub supports different inbound channel rates in one inbound band Up to 3 different channel rates can be defined per Inbound Band The relation between them is of the form x1:x2:x4 Different set of rates can be configured for different inbound bands
More Flexibility
14
15
1
SkyEdge Inbound Access Scheme Why are we dealing with Access Schemes?
Reducing OPEX – efficient use of space segment Supporting different applications/needs in one network Improving and controlling Network behavior
SkyEdge Family Hub
2
SkyEdge Access Schemes SkyEdge supports a variety of access schemes and channel types
The aim is providing highest adaptability to different network scenarios and customer needs
The network designer defines the inbound channel scheme according to traffic assumptions and desired network behavior
Flexibility – Only a combination of different channel types on one network can provide a good solution to accommodate different applications and services 3
Main highlights Combination of TDMA and FDM -> FTDMA High utilization DAMA – Dynamic Assigned Multiple Access Sharing of resources (opposed to PAMA) Slotted ALOHA Access Twice more utilized than pure ALOHA (36% to 18%)
4
TDMA/MF-TDMA Satellite Access Schemes
SkyEdge MF-TDMA
TDMA
713
155 25
55
103
163
32
76
134
180
82 55
148 103
198 163
76
134
180
2
25 32
155
851 426 422
851 426 851 426
713 155 422
851 426 851 713 422
25
55
2
82
155 851
163
851 477
198
148
Time
Time
Time
103
155
Time
422
51-100
101-150
851 477
713
155 851 477 Dedicated Access Channels
200 - 1
151-200
Each frequency slot serves a group of VSATs More adapted to low bit-rates with low variability and well known applications ■ low utilization ■ ■
851 477
713 422
Time
1-50
Frequency
Complete bandwidth available to all sites More adapted to variable bit-rates and variety of applications ■ high utilization ■ ■
5
D-TDMA/MF-TDMA Satellite Access Schemes
SkyEdge MF-TDMA
D-TDMA
713
155 25 32 2 27 8 32
3 22 4 23 1 22
27 39 12 27 15 27
15 33 9 21 11 33
155
851 426 422
Frequency
851 426 851 426
713 155 422
851 426 851
8
1
713 422
15
11
155 851 851 477 155
Time
Time
Time
Time
422 Time
1-5
6-10
11-15
713 422
851 477
713
155 851 477 Dedicated Access Channels
1 - 200
16-20
Each frequency slot serves a group of VSATs More adapted to constant bit-rates with low variability and well known applications ■ Wasted BW when no traffic ■ Not scalable ■ ■
851 477
Complete bandwidth available to all sites More adapted to variable bit-rates and variety of applications ■ Efficient when no traffic ■ Very scalable 6 ■ ■
SkyEdge – Access Scheme I RA – Random Access – best for short transactional applications lowest latency – ping time as low as 600 msec
collision Time
Frequency CRA – Collision Reduction Algorithm – managing the busy VSATs by distributing them among different channels (avoid two busy VSATs on the same channel group)
7
SkyEdge – Access Scheme II DA – Dedicated Access Channels (and Partial DA) Collisionfree channel !
Time
allocation
ADA Triggers • TCP/UDP port number RA VDA = Voice DA – best voice performance
RA
DA
Trigger – ADA request
Frequency
• IP Address source/dest • IB Rate of Traffic (ROT) • Queue threshold • Permanent DA
8
SkyEdge – Access Scheme III GA – Guaranteed Access Channels VDA – Voice Dedicated Access Separation between Voice and Data – guarantees predictable QoS for Voice at all times (according GOS) Time
allocation
RRA
GA
Requests for Transmissions are done here
GA
VDA
Dedicated Voice Access
GA provides 25% better space utilization over an RA network
Frequency
9
VDA – best support for voice Circuit switched Utilization Lowest jitter Low delay Low BW per call Controlled Quality
10
SkyEdge – Access Scheme III Adding an RA channel to GA environment to enjoy reduced delay (Rel 4.0)
GA – Guaranteed Access Channels
Time
allocation
RRA
GA
Requests for Transmissions are done here
GA
VDA
RA
Dedicated Voice Access
Frequency
11
SkyEdge – Access Scheme Concepts IV Mesh Channel – Transmission between VSATs
Mesh channels reduce space segment by eliminating satellite hops Mesh channels provide connections with half the latency as opposed to star channels
Time
RRA
GA
GA
Star – VSAT to Hub
VDA
MVDA
Frequency
VSAT to VSAT 12
Dividing the Inbound into separate bands Inbound channels can be divided to 8 groups Each group is configured independently (access, rates)
Value to the operator – Support a shared Hub service or adapt better to a network with different services.
Example Internet Residential service - 128 kbps channels, GA CDMA backhaul – 512 kbps channels, RA
13
Rele
Multiple channel bit rates in one band
ase 4
.0
The SkyEdge Hub supports different inbound channel rates in one inbound band Up to 3 different channel rates can be defined per Inbound Band The relation between them is of the form x1:x2:x4 Different set of rates can be configured for different inbound bands
More Flexibility
14
15
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