rca gprs slow speed aircel

7/29/2019 RCA GPRS Slow Speed Aircel

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HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com

Huawei Confidential

Security Level:2013/9/24

GPRS Slow Speed IssueAIRCEL Kerala/AP


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HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 2

GPRS Speed Issue Aircel Kerala/AP

Problem Statement

Slow GPRS Download Speed in Aircel Kerala and Andhra Pradesh

Analysis

For Troubleshooting, GPRS Speed was checked by Downloading large size files from

FTP Server connected after Chennai GGSN.( Last point of Huawei Network)

Que :Why not Speed checked by downloading from Public IP such as Google or Yahoo.

Ans : So as to rule out any issue in Radio Interface or in BSC or in SGSN or in GGSN.

For Gb over FR BSCs Speed was normal ( 15~20 KBps) while for Gb over IP it was

almost half (5~10 KBps)

Que: Why it was so

Ans : This was abnormality

One BSC in Kerala (Kochi-1) was converted from Gb over IP to FR and there was

considerable improvement in Speed ( Up to 21 KBps max) .

Que : Why converted

Ans : To confirm that issue is in Gb over IP


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Action Taken

Ciphering was disabled in Chennai SGSN after which Speed of Gb over IP BSCs

was at par with Gb over IP BSCs

Que: Why Ciphering was impacting GPRS Speed in Gb over IP BSCs only

Ans: It is due to overhead involved with each packet transmission.

Que : When will be Ciphering re-enabled

Ans : Not Required as it is already disabled for Voice also ( In BSC and MSC)

Way Forward

As the Data Speed is Normal (15~20 KBps) for all BSCs till FTP Server (Last mile

of Huawei) troubleshooting required beyond GGSN till ISP Server if Speed from

Public IP is still slow.

Que: How to do that

Ans: Need to check ISP Bandwidth, Router Performance and settings .we are also

analysing and will help in troubleshooting.

GPRS Speed Issue Aircel Kerala/AP


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HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com

Huawei Confidential

Security Level:2013/9/24

GPRS Slow Speed IssueFurther Analysis Beyond Huawei N/W


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HUAWEIGGSN

Switch 1 Router

Switch 2

Firewall 1

Firewall 2

Huawei Ericsson

Unkwon

Devices

10.178.9.1 10.178.9.2 10.178.9.69 192.168.35.186

G0/0/13

G0/0/13

Active Path

Problem

Area

E2/0/0

Towards

ISP

3. Ping to individual hopes confirm drop

between 10.178.9.69 to 192.168.35.186HRP_M[Eudemon Fw1]ping -c 1000 -a 58.68.66.250

192.168.35.186

--- 192.168.35.186 ping statistics ---

177 packet(s) transmitted

135 packet(s) received

23.72% packet lossround-trip min/avg/max = 1/565/1950 ms

1. Ping to google from huawei FW confirmed 30% packet

loss:HRP_M[Eudemon Fw1]ping -c 1000 -a 58.68.66.250 12.0.1.28

--- 12.0.1.28 ping statistics ---

56 packet(s) transmitted

39 packet(s) received

30.35% packet loss

round-trip min/avg/max = 250/279/517 ms

2. Trace route initiated to confirm hops::HRP_M[Eudemon Fw1]tracert -a 58.68.66.250 74.125.127.1001 10.178.9.69 0 ms 0 ms 0 ms

2 * * *

3 192.168.35.186 0 ms 0 ms 0 ms

4 192.168.36.75 0 ms 0 ms 0 ms

5 58.68.0.17 0 ms * 0 ms

6 202.148.198.193 0 ms 0 ms 0 ms

30 % Drop

Packet flow-Packet

Size-56 bytes70 % Pass

Packet flow-Packet

Size-1000 bytes

100 % Drop


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GPRS Speed Issue

RCA

Packet Loss between Kilpauk and Spencer Interface.

Que: What can be suspected causes

Ans: High Bandwidth Utilization between Kilpauk and Spencer

Non compatible Interface Settings in Kilpauk and Spencer Router

Transmission Media


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DishnetISP

Switches Routers Routers Firewalls Routers

Kilpauk Spencer

Ericsson network

HuaweiNetwork

SN_VRF SN_VRF SN_VRF ISP_VRF

FE

FE FE

FE FE

FE

FE

FE

STM

STM

FE

FE


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Thank youwww.huawei.com

rca gprs slow speed aircel

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