Part 2: Principle and Implementation of EVDO Systems WLL SHORT TRAINING.
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Transcript of Part 2: Principle and Implementation of EVDO Systems WLL SHORT TRAINING.
Part 2: Principle and Implementation Part 2: Principle and Implementation of EVDO Systems of EVDO Systems
WLL SHORT TRAINING
UNIT 1
UNIT 2
EVDO Theory EVDO Theory Unit 1Unit 1
AT
Target AN
Source AN
PCF PDSN
AN AAA
A12 AAA
AN
IP Network
AT
IP Network
AT
Target AN
Source AN
PCF PDSN
AN AAA
A12 AAA
AN
IP Network
AT
IP Network
1X EVDO Network Structure1X EVDO Network Structure
Comparison of EVDO and 1x NetworksComparison of EVDO and 1x Networks
MS/AN
HLR
PDSN
AAA
BTSB BSCB PCF
MSC
ANAAA
Network ImplementationNetwork Implementation
Changed Parts in UpgradingChanged Parts in Upgrading
• BTS side: • - If new EVDO carrier is added
• Add EVDO base band processing part• Add related Radio transmission part, keep
antenna and feeder.
• - If upgrading 1x carrier to EVDO carrier• Add EVDO base band processing part• Keep antenna and feeder no change
Changed Parts in Upgrading (Cont.)
• BSC side: add EVDO processing part, upgrade related software• - EVDO Signaling• -Increased EVDO data capacity
UNIT 1
UNIT 2
EVDO Channel Structure & Key EVDO Channel Structure & Key TechniquesTechniques
• Forward Link Channel Structure• Reverse Link Channel Structure• Key Techniques
Forward Channel StructureForward Channel Structure
ControlMediumAccessControl
Pilot Traffic
ReverseActivity Channel
ReversePower
Control(RPC)
Forward
DRC Lock
Forward Data Time SlotForward Data Time Slot
Forward Pilot ChannelForward Pilot Channel
The Pilot channel is sent as 96 chip bursts, each of which is located at the center of each half slot.
The Pilot channel is transmitted at the full sector power.
Forward MAC ChannelForward MAC Channel
• The Reverse Power Control Channel (RPC channel) and the DRCLock Channel are time-division multiplexed.
• RPC channel is used for reverse power control.• DRCLock is used to indicate if the reverse Date Rate
Control (DRC) channel message is received or not.• Reverse Activity (RA) channel is CDMed with RPC
channel + DRCLock channel• Reverse Activity Bit (RAB) is transmitted in RA
channel, which is broadcasted by AN to inform ATs the current reverse traffic channel status.
MAC IndexMAC Index
Forward Control ChannelForward Control Channel
Forward Control ChannelForward Control Channel
• Data rate is 38.4 or 76.8kbps.• The Control Channel Cycle is of 256 slots.• Broadcast Overhead messages and Page
messages are always delivered by using Synchronous Capsule (AC).
• Asynchronous Capsule (AC) used to deliver ACK messages and RLP Control messages, may be sent at any time during which the AN is not sending a synchronous capsule.
Forward Traffic ChannelForward Traffic Channel
• Supported data rates: 38.4, 76.8, 153.6, 307.2, 614.6, 921.6, 1228.8, 1843.2, and 2457.6 Kbps.
• QPSK, 8PSK and 16-QAM are used.• Channel encoders with different code rates are
used. • Physical layer packets are of four different lengths:
1024 bits, 2048 bits, 2072 bits and 4096 bits.• A preamble is attached as the header of each
physical layer packet.• The transmitted packet = preamble + physical
layer packet
Forward Traffic Channel ParametersForward Traffic Channel ParametersData rate
(kbps)Slots per
Packet
Packet Size (bits)
Code Rate
Repetition Modulation Preamble (chips)
Effective code Rate
38.4 16 1024 1/5 9.6 QPSK 1024 1/48
76.8 8 1024 1/5 4.8 QPSK 512 1/24
153.6 4 1024 1/5 2.4 QPSK 256 1/12
307.2 2 1024 1/5 1.2 QPSK 128 1/6
307.2 4 2048 1/3 49/48 QPSK 128 16/49
614.4 1 1024 1/3 1 QPSK 64 1/3
614.4 2 2048 1/3 49/48 QPSK 64 16/49
921.6 2 3072 1/3 49/48 8PSK 64 16/49
1228.8 1 2048 1/3 0.5 QPSK 64 2/3
1228.8 2 4096 1/3 49/48 16QAM 64 16/49
1843.2 1 3072 1/3 0.5 8PSK 64 2/3
2457.6 1 4096 1/3 0.5 16QAM 64 2/3