Radio Introduction 2015 Kasidit Yusuf Don Plooksawasdi Songkran Jarusirisawad

Basic Steps

1. Radio or Non-Radio?

2. Coverage

3. Interference

4. Configuration

5. Conclude

6. Take Action

WCDMA Characteristics

2. WCDMA is similar to a party

1. GSM is similar to public speech

3. WCDMA is interference limited

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

Technologies Comparison Signal (Coverage)

GSM

LTE

Interference

BER(Packet Loss))

Cell Mobility

WCDMA

Rx Level

C/I

Rx Qual

S/N

-

Signal (Code coverage)

RSSI

Ec/Io

BLER & SBLER

A/M/D

RSCP

RSSI

SINR & RSRQ

BLER

S/N/D

RSRP

GSM Basic

1. Rxlvl

2. RxQual

3. C/I

4. RLT

GSM Data Basic

1. RLC Throughput

2. GPRS C/I

3. Modulation

4. Coding scheme

WCDMA Basic

1. EC/IO

2. RSCP

3. BLER

4. RSSI

WCDMA Data Basic

1. L1 Throughput

2. CQI

3. Modulation

4. Num code used

5. SBLER

LTE Basic

1. RSRP

2. SINR

3. RSSI

4. RSRQ

LTE Data Basic

1. Transmission Mode

2. Rank

3. BLER

4. RB

5. L1 Throughput

Layer 3 Messages

1. Protocol Layer

2. Request

3. Response

4. Non-Radio

5. Radio

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)

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

SINR by Download

RSRP by Upload

RSRP

RSRQ

PDSCH Spatial Rank

Overall Throughput

QOS Issues

1. Call Block

2. Call Drop

3. Data Connect Fail

4. Low DL/UL Throughput

Some common causes

1. RL Link Failure

2. RRCConnection release

3. Pilot Pollution

4. CM Service Reject

5. CC Disconnect

Basic Steps

1. Radio or Non-Radio

2. Coverage

3. Interference

4. Configuration

5. Conclude

6. Take Action

What to report

1. PCI/PSC Lat/Lon/LAC

2. Problem Cause

Sample logs