Catatan EF

Understanding of 4G Accessibility

2019-03-09T22:19:00.001+07:00

ACCESSIBILITY for the E-UTRAN is a measure of the ability of a user to obtain an E-RAB from the system

The Initial E-RAB Establishment process can be divided into the following phases:

RRC CONNECTION ESTABLISHMENT
S1 SIGNALING CONNECTION ESTABLISHMENT
INITIAL E-RAB ESTABLISHMENT OR E-RAB ADDITION

Counter Related :

MAJOR REASONS FOR POOR ACCESSIBILITY

1. Poor coverage

Check inter site distance with neighbors site.
Check value of pmBadCovEvalReport (if MCPC enabled, need to check pmCriticalBorderEvalReport). If this counter is pegging high in respect to RRC attempts, then we can say that more number of UEs are falling in bad coverage.
Check pmRadioTbsPwrRestricted to see if UE has reached maximum power of UE.
Check if the cell is overshooting and the power of the cell is to high

2. Alarms

Through OSS commands “alt” (Current / Active site alarms can be checked) & “lga <nd>” (n is an integer value) (Site alarms present for n days can be checked)
Sometimes, due to MOs are not synchronized properly, pmRrcConnEstabFailOverload is pegged high. In this case, the ServiceUnavailable (S1 Connection failure) alarm is observed in sites, even though RRC Conn Users remain to be same.

3. High Load (High Traffic)

The command “ue print -admitted” is used to find the no. of UEs currently latched to the site sector-wise ROP-wise & the counters “pmRrcConnMax (max)” & “pmRrcConnMax (sum)” are used to find out ‘max. active users/ day’ and ‘sum of all active users/day’, respectively.
Connected User License Congestion
Check counter “pmRrcConnEstabFailLic” . If this counter is pegging, which means there will be rrc connection request reject due to Connected User License limitation.

4. H/W issue (Hard Reset on site)

If RRUs are disabled, in that case “HW fault” alarm is observed in sites.
Command “st . aux” shows that the operational state of the auxiliary unit/ RRUs is DISABLED

5. High UL interference

High UL N+I is impacting to all KPIs. UL NI values {-119 …….. -110 dBm} is considered to be good.
The cause may be Internal Sources (Check Tx & Rx antenna ports, fiber cables and connectors. All connection should be proper) and External Sources ( like repeaters, airport, power plant etc. sources resulting in high EMW in the neighborhood).
pmRadiorecInterferencePwr is checked for UL N+I values.

6. PCI conflict

Two types of PCI conflict:

PCI confusion, i.e., UE is confused if it is getting two or more target cells having same PCI.
PCI collision, i.e., UE is collision due to source and target having same PCI.

Impacts all KPIs.
Use “EUtranCellFDD . pciconflict” to find out PCI conflict of site.

7. RACH Root Sequence Index plan need to be reviewed

Based on ‘Zero Correlation Zero Configuration‘ parameter RACH root Sequence index need to be planned. Difference of 10 is recommended for RACH root Sequence index per cell.

8. VSWR over threshold

The cabx command provides VSWR status for RL1 & RL2 (for 2T2R). Both, RL1 and RL2 should be difference of less than 5.

9. Cell availability

Cell availability should be 100% , more when it is in cell busy hour.

Fast Return Parameter

2019-03-09T22:03:00.003+07:00

Bagi agan yang ingin mengetahui sample parameter dan feature fast return dari 3G ke 4G terutama untuk Vendor Ericsson dapat dilihat tabel dibawah ini :

Semoga dapat bermanfaat dan pengingat bagi saya juga.

Question & Answer about LTE

2019-03-09T21:55:00.000+07:00

Q1. What is the difference between CFRA and CBRA?

CFRA – Contention FREE Random Access – Preamble reserved Used for Handover between cells and Downlink data transfer requiring UE synchronization

CBRA – Contention BASED Random Access – Preamble randomly selected used for Initial network access, Access following a radio link failure, Handover between cells, Downlink data transfer requiring UE synchronization, Uplink data transfer requiring UE synchronization

Q2. What is Link Adaptation in LTE?

Adjusting transmission parameters according to the channel condition is called link adaptation.

Transmission parameters that can be adjusted are coding rate, modulation scheme, transport block size and tx rank.

Q3. Which transmission scheme is used if two transport blocks are used per TTI and transmission mode 3 is used?

Transmission Mode 3 = Open loop spatial multiplexing
Open loop spatial multiplexing can be TX Diversity or Large Delay CDD.
As question states two transport blocks in one TTI = Two code words in one TTI => Transmission scheme to be used is Large Delay CDD

Q4. Whar are benifits of “Uplink Frequency Selective Scheduling”?

It may improve the peak rate, cell Capacity, covetage and tries to schedule the best part of the frequency band for each UE

Q5. What does the feature “Dynamic GBR Admission Control” mean?

It secures that that there are resources for GBR users and protects non-GBR users from starvation

Q6. What is the difference between connected mode mobility and idle mode mobility?

Idle mode mobility relies on UE measurements and UE decisions whether to make a cell reselection or not. The MME keeps track of the UEs on a TA level.

Connected mode mobility relies on UE measurements and eNB decisions whether to make Handover or not. The UE position is known on cell level by the eNB.

Q7. What is the main task of the UE in handover?

The UE is ordered to make certain measurements and to report events when the event criteria are fulfilled. The eNB evaluates
the measurements and makes HO decisions. In case of an HO, the eNB orders the UE to go to the target cell.

Q8. How many HO events are there in LTE?

A2: Serving cell quality drops below and absolute threshold
A3: A neighboring cell becomes better than serving cell by a certain amount (qHyst).
A5: Serving cell becomes worse than absolute threshold1 AND neighbor cell becomes better than another absolute threshold2.
B2: Serving cell worse than threshold1 AND IRAT neighbor better than threshold2

Q9. Event A2 may trigger in which of following cases?

Blind release with redirect to WCDMA
IRAT HO to WCDMA
IRAT HO to GSM
Blind release with redirect to GSM

Q10. What are the benefits of Redirect with System Information?

The interruption time at release with redirect is shortened as the UE does not have to read system information before accessing the cell.
It improves the end user experience of the CS Fallback feature and also Inactive UEs can be released quicker.
System information from target cell is included in the release message

Q11. List ANR functionality in LTE.

Neighboring cells are added to neighbor lists
X2 interface is established
Neghboring cells can be removed from list if they are not used during a predefined time
OSS-RC is notified about add/remove of neighbor

Q12. Which are the requirements from the UE side in ANR?

The UE must be capable of reading and reporting CGI. (If a UE capable of reporting CGI is not available, all external cells that

are possible neighbor cells must be defined manually.)

For inter-frequency ANR and ANR for UTRAN or GERAN it must of course also support the wanted other frequency.
It must support measurement gaps to measure PCI on other LTE frequencies, scrambling code (SC) of UTRANand Base Station Identity Code (BSIC) of GERAN.
It must support DRX to be able to measure CGI from neighboring cells.

Q13: Whats is the range of RSRQ in LTE?

UE usually measures RSRP or RSRQ based on the direction (RRC message) from the network and report the value. When it report this value, it does use the real RSRQ value. It sends a non-negative value ranging from 0 to 34 and each of these values are mapped to a specific range of real RSRQ value as shown in the following table from 36.133.

Q13: How many resource elements are used to carry reference signals?

8 RE's are used to carry reference signals and 16 RE's used when 2 antenna ports are in used. To allow the UE to distinguish between the anttena ports reference signals are staggred in time with transmission suspended alternatively on each antenna port when the other is transmitting.

POLA SFH 1x1 dan 1x3

2015-01-06T10:59:00.000+07:00

Pola SFH yang kita kenal pada umumnya adalah 1 x 1 dan 1 x 3, lalu ada lagi nih pertanyaan kalau 3 x 1?
kalo menurut saya seperti ini:

1 x 1 itu kan dalam 1 site misal ada 3 sektor dan ketiga sektor itu memakai MALIST yang sama.

gambar 1 (1 x 1)

1 x 3 itu kan dalam 1 site misal ada 3 sektor dan ketiga sektor itu memakai MALIST yang berbeda.

gambar 2 (1 x 3)

berarti kalau 3 x 1 adalah ada tiap 3 site (dalam 1 cluster mungkin) memakai MALIST yang sama, hehe bener ga? :D kalau kurang pas penjelasannya, mohon pencerahannya dong master yang sedang membaca blog ini :)

soalnya saya belum menemukan referensi tentang hal tersebut.

Metro TV - online streaming

2015-01-04T21:55:00.003+07:00

PT. Media Televisi Indonesia was granted a broadcasting licence for Metro TV on October 25, 1999. It is a subsidiary of the Media Group, headed by Surya Paloh, the company's CEO/President, who was a wealth of experience in the local media industry and is the publisher of Indonesia's third largest national newspaper. Media Indonesia. From a start up work force of 280 employees the company now employs more than 1200 people, mostly in the newsroom and production areas.

On November 25. 2000. Metro TV went on air for the first time in a trial series of broadcasts to seven cities. At first it was aired for only twelve hours a day until April 1, 2001, when 24 hour broadcasting began.

Perhaps the greatest challenge for the company in the early stages was the need to build its infrastructure, facilities and team, all within the short time scale of nine months. Though this was hard work the experience gained was invaluable in forging a solid team of experienced professionals who had already been tested under challenging conditions.

The company has ushered in a new wave of lifestyle and quality alternative entertainment programming to compliment its dominance in the news sector of the industry. It has pioneered new perspectives and unique one-of-a-kind programs while improving the way information is presented. Sophisticated and stylish productions from Metro TV have breathed new life into the industry. Even the most discerning viewers have a viewing choice second to none.

The desire to be the best drives the company's enthusiasm and its multi-dimensional approach to programming needs. Looking ahead to 2006 the vision of the company is to have by then achieved number one ranking for its news quality and delivery as well as extraordinarily high levels of loyalty from both viewers and advertisers.

The company also takes its corporate responsibility towards shareholders and employees seriously. Though consistent in driving forward to achieve a significant level of growth and profit and to leverage its assets, the welfare and quality of life of Metro TV employees remains of paramount importance.

Cara SWAP BCCH perangkat Nokia

2015-01-04T18:19:00.001+07:00

langsung aja deh:

Command:

ZEEI:BTS=55;
ZERM:BTS=55,TRX=1:PREF=N;
ZERM:BTS=55,TRX=2:PREF=P;
ZEQS:BTS=55:L;
ZEQS:BTS=55:U;
ZEEI:BTS=55;
ZERO:BTS=55;

ini masih di 2 trx pertama dan masih dalam 1 e1

utk case di e1 yg berbeda maka setelah di swap, cek gtrx nya ubah ke status awal sbelum di proses swap bcch.

Command:

ZEQS:BTS=XXX:L;
ZERS:BTS=XXX,TRX=A&B:L;
ZERM:BTS=XXX,TRX=A:GTRX=Y;
ZERM:BTS=XXX,TRX=B:GTRX=N;
ZERS:BTS=XXX,TRX=A&B:U;
ZEQS:BTS=XXX:U;

Selalu Cek ZEEI dan ZERO.

Gimana retune frequency nsn??

2015-01-04T16:51:00.000+07:00

1. Preparing the NCR (Network Change Request) / PCR ( Parameter Change Request) For Adjenciesnya (Update BCCH)

2. Creating new MAL ID

STEP TO Create MAL ID :

MAL ID 1 : frequency list 1,2,3,4,5

MAL ID 2 : Frequency list 6,7,8,9,10

MAL ID 3 : Frequency list 11,12,13,14,15

Command : ZEBE (CREATE MOBILE ALLOCATION FREQUENCY LIST)

ZEBE:MAL,<MAL ID>,<BAND>:FREQUENCY=<frequency>;

Example :

ZEBE:MAL,1,900:FREQ=1&2&3&4&5;

ZEBE:MAL,2,900:FREQ=6&7&8&9&10;

ZEBE:MAL,3,900:FREQ=11&12&13&14&15;

3. Modifying BCCH Frequency

a. Lock the BTS by applying the forced handover procedure.

Command : ZEQS (CHANGE BTS ADMINISTRATIVE STATE)

ZEQS:BTS=<BTS ID>:<administrative state>: [ <forced handover> | <immediate lock> | <time limit> | <300 sec> def ] ... ;

Example :

ZEQS:BTS=24:L:FHO;

b. Lock the BCCH TRX. Identify the TRX by the old BCCH frequency.

Command : ZERS (CHANGE TRANSCEIVER AND RADIO TIME SLOT STATE)

ZERS:BTS=<BTS ID>, TRX=<TRX ID>, <administrative state>;

Example :

ZERS:BTS=24,TRX=1:L;

c. Modify the BCCH frequency.

Command : ZERM (MODIFY TRANSCEIVER AND RADIO TIME SLOT PARAMETERS)

ZERM:BTS=<BTS ID>, TRX=<TRX ID>:FREQ=<frequency>;

ZERM:BTS=24,TRX=1:FREQ=37;

The system updates the data related to the adjacent cells within the BSC according to the new BCCH frequency.

d. Unlock the BCCH TRX.

Command : ZERS (CHANGE TRANSCEIVER AND RADIO TIME SLOT STATE)

ZERS:BTS=<BTS ID>, TRX=<TRX ID>, <administrative state>;

Example :

ZERS:BTS=24,TRX=1:U;

e. Unlock the BTS.

Command : ZEQS (CHANGE BTS ADMINISTRATIVE STATE)

ZEQS:BTS=<BTS ID>:<administrative state>: [ <forced handover> | <immediate lock> | <time limit> | <300 sec> def ] ... ;

Example :

ZEQS:BTS=24:U;

4. Modifying MAL, MAIO Offset, MAIO Step & HSN

a. Lock the BTS by applying the forced handover procedure.

Command : ZEQS (CHANGE BTS ADMINISTRATIVE STATE)

ZEQS:BTS=<BTS ID>:<administrative state>: [ <forced handover> | <immediate lock> | <time limit> | <300 sec> def ] ... ;

Example :

ZEQS:BTS=24:L:FHO;

b. Modify , MAIO Offset, MAIO Step, HSN

Command : ZEQA (MODIFY MOBILE ALLOCATION FREQUENCY LIST USAGE PARAMETERS)

ZEQA:BTS=<BTS ID>: (MAL=<mobile allocation frequency list> | UMAL=<underlay mobile allocation frequency list> <option> | MO=<MAIO offset> | UMO=<underlay MAIO offset> <option> | MS=<MAIO step> <option> | UMS=<underlay MAIO step> <option> | DMAL=<DFCA mobile allocation frequency lists> <option> | OPE=<DFCA operation type> <option> | DUMAL=<DFCA unsynchronized mode MA frequency list> <option>) ... ;

Example

ZEQA:BTS=24:MAL=1,MO=6,MS=2;

c. Modify HSN

Command : ZEQE (MODIFY BTS IDENTIFICATION PARAMETERS)

Example

ZEQE:BTS=24:HOP=RF,HSN1=;

d. Unlock the BTS.

Command : ZEQS (CHANGE BTS ADMINISTRATIVE STATE)

ZEQS:BTS=<BTS ID>:<administrative state>: [ <forced handover> | <immediate lock> | <time limit> | <300 sec> def ] ... ;

Example :

ZEQS:BTS=24:U;

5. Updating BCCH Frequency for External Neighbours

Command : ZEAM (MODIFY ADJACENT CELL PARAMETERS)

Example :

ZEAM:BTS=24::LAC=120,CI=12354::FREQ=30;