EI Training (Radio-revised)
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Transcript of EI Training (Radio-revised)
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Radio Introduction 2015 Kasidit Yusuf Don Plooksawasdi Songkran Jarusirisawad
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Basic Steps
1. Radio or Non-Radio?
2. Coverage
3. Interference
4. Configuration
5. Conclude
6. Take Action
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WCDMA Characteristics
2. WCDMA is similar to a party
1. GSM is similar to public speech
3. WCDMA is interference limited
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LTE Characteristics
2. LTE is a mixed of GSM & WCDMA into what is called OFDMA
1. LTE is similar to many small parties organized on a short notice (RB)
3. LTE tries to evolve the mobile network into a large IP network
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Technologies Comparison Signal (Coverage)
GSM
LTE
Interference
BER(Packet Loss))
Cell Mobility
WCDMA
Rx Level
C/I
Rx Qual
S/N
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Signal (Code coverage)
RSSI
Ec/Io
BLER & SBLER
A/M/D
RSCP
RSSI
SINR & RSRQ
BLER
S/N/D
RSRP
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GSM Basic
1. Rxlvl
2. RxQual
3. C/I
4. RLT
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GSM Data Basic
1. RLC Throughput
2. GPRS C/I
3. Modulation
4. Coding scheme
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WCDMA Basic
1. EC/IO
2. RSCP
3. BLER
4. RSSI
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WCDMA Data Basic
1. L1 Throughput
2. CQI
3. Modulation
4. Num code used
5. SBLER
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LTE Basic
1. RSRP
2. SINR
3. RSSI
4. RSRQ
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LTE Data Basic
1. Transmission Mode
2. Rank
3. BLER
4. RB
5. L1 Throughput
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Layer 3 Messages
1. Protocol Layer
2. Request
3. Response
4. Non-Radio
5. Radio
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User Data VS Radio Signaling
User Data flow
Request Connect Flow Disconnect
Radio Signaling Flow (RRC/Bearers) - EMX
Request Bearer Setup Flow Radio Disconnect Signaling Setup
Radio Maintenance (Measurement Report/ Mobility)
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L3 Message References
Radio
GSM
LTE
WCDMA
RR
CC , MM , GMM , SM
24.007 , 24.008
44.018
Non-Radio
RRC
25.331
RRC
EMM
24.301
36.331
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SINR by Download
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RSRP by Upload
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RSRP
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RSRQ
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PDSCH Spatial Rank
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Overall Throughput
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QOS Issues
1. Call Block
2. Call Drop
3. Data Connect Fail
4. Low DL/UL Throughput
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Some common causes
1. RL Link Failure
2. RRCConnection release
3. Pilot Pollution
4. CM Service Reject
5. CC Disconnect
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Basic Steps
1. Radio or Non-Radio
2. Coverage
3. Interference
4. Configuration
5. Conclude
6. Take Action
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What to report
1. PCI/PSC Lat/Lon/LAC
2. Problem Cause
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Sample logs