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Security Level: INDONESIA WIMAX PROJECT NPM Summary Report (Explanation KPI degradation) Author/ Email: WiMAX &TD-LTE RNP/O Engineer Version: V1.1(20130217)
| Date post: | 13-Jul-2015 |
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Technology |
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Security Level:
INDONESIA WIMAX PROJECT
NPM Summary Report (Explanation KPI degradation)
Author/ Email: WiMAX &TD-LTE RNP/O Engineer
Version: V1.1(20130217)
Page 2
Weekly Network KPI Summary Exclude Authentication )
Page 3
Low EASR Medan
There are Radio Access Failure and Capability Negotiation Failure issue for some subscriber that shown in graphic on 18 Jan 2013.
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Network Performance AnalysisEASR
Page 5
BS with low EASR at 13 Feb 2013
Page 6
Asia Ujung
During 13 Feb 2013, we found one subscriber with poor RF condition tried to entering the network and always fail. Need to customer visit to solve this problem.
Explanation Release Cause: Before the data path is set up, the GW requests to exit the network (C01). The GW sends the NetExit MS State Change Req message to initiate network disconnection. (C02)
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MSID : 2010-7A31-5A6E (ASIA UJUNG-0)
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External Interference Detection
There is additional source of external interference on 2362,5 MHz
Page 9
JL Sutrisno
During 13 Feb 2013, we found some subscriber with poor RF condition tried to entering the network and always fail. Need to customer visit to solve this problem especially for MSID 2013-7A31-5A6E because detected also from ASIA UJUNG.
Explanation Release Cause: Before the data path is set up, the GW requests to exit the network (C01). The GW sends the NetExit MS State Change Req message to initiate network disconnection. (C02)
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MSID : 2010-7A31-5A6E (JL Sutrisno-0)
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External Interference Detection
There is additional source of external interference on 2362,5 MHz
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PUKAT
During 13 Feb 2013, we found one subscriber with poor RF condition tried to entering the network and always fail. Need to customer visit to solve this problem.
Explanation Release Cause: Before the data path is set up, the GW requests to exit the network (C01). The GW sends the NetExit MS State Change Req message to initiate network disconnection. (C02)
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MSID : 2010-7A31-58D9 (PUKAT-2)
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External Interference Detection
From analysis of end-user with Low EASR the RF condition still in interference condition.
We suggest Operator to clearance this problem with Government to minimize the illegal spectrum user
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External Interference Detection
There is additional source of external interference on 2362,5 MHz
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Mapping of Problem EASR
2010-7A31-58D9
2010-7A31-5A6E
From beside picture, that is only prediction of subscriber location from Mapping of Low EASR distribution.
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Network Performance AnalysisSBC
Page 18
Chandra Kusuma – Low SBC
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Chandra Kusuma – Low SBC
When there are interference will impact to Radio Access Failure Rate.Sect 2 and Sect 1 is the most high Interfered from external source.
Beside Poor RF condition, there is Ethernet Link Fault during the mid day.
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SBC Monitoring – Chandra Kusuma
Being Normal Condition
SBC Failure Duration
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SBC Failure Time Distribution
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Net Entry Procedure
SBC Process
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SBC Fail Case (R6 Failure)
BS ASN AAA
Physical Sync
Init Ranging
RNG-RSPRNG-RSP
RNG-REQSBC-REQ PRE_ATTACH_REQ
Intermittent
SBC-REQSBC-REQSBC-REQSBC-REQSBC-REQ
SBC-FAIL
SBC---The BS send PRE_ATTACH_REQ exceeding the limit number of re-issued because not receiving the message which GW responds PRE_ATTACH_RSP.
R1 R6 R3
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SBC Fail Case (R1 Failure)
BS ASN AAA
Physical Sync
Init Ranging
RNG-RSPRNG-RSP
RNG-REQSBC-REQ
Interference
SBC---Waiting time for terminal to send SBC-REQ message fails. That is, timer SBC is timeout. (C02)
The possibilities: 1. The MS does not receive the previous RNG-RSP message because the strength of downlink signals is weak. Check the downlink interference and change
the MS location. 2. The MS transmits the SBC-REQ message, but the message is lost at the air interface. Check the downlink interference and change the MS location.
R1 R6 R3SBC REQ
message lost
in air interface
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Interference Detection
In TDD Technology, Interference is the most distributed of access failure. This problem come from external radio technology.
We suggest to Operator to clearance the Interference with BALMON.
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Monitoring KPI and Summary
• Chandra Kusuma only has SBC Failure during 13 Feb 2013 due to MW Link have been interrupted with tree, and SBC down during cutting of tree.•ASIA UJUNG still have EASR problem until 14 Feb 2013.•JL Ahmad Yani and Pasar Merah have same problem with previous explanation about external interference impact.
•Operators need to clearance the external Interference with government.
Thank you
