Layer3 Messages

Signaling Layer3

Radio Network Planning and Optimization

• The flow of layer3 messages in TEMS can be seen in Layer3 messages widows from menu Presentation�Signaling�Layer 3 Messages.• Messages which can not be decoded are shown in Error Report.• In TEMS version lower than TEMS8, detail of layer3 message can be locked and open more than 1 message at the same time.

Radio Network Planning and Optimization

Layer3 Messages

Layer 3 Control• In TEMS version5 or lower, Layer 3 message can be manipulate and ask mobile to send, delay or discard specific layer messages.

• From the windows, we can see the available messages in DL and UL, unfortunately not all messages that we can modify.

Radio Network Planning and Optimization

Layer3 Messages

Case Study #1 (Emergency HO observation)• In order to observe the situation after Emergency Handover, instead of going out for drive test we can modify layer 3 messages. The modification report the BSC that the current radio condition is bad and at the same time we can setup the different of the RxLevel between Serving and neighbors.

• Please find the value of penalties time after BQ Handover.

Radio Network Planning and Optimization

Layer3 Messages

Practice #1 (Timer 3105, and NY1)• Timer 3105 is used for the repetition of the PHYSICAL INFORMATION message during the synchronism handover procedure. • After network receive HANDOVER ACCESS, it will send PHYSICAL INFORMATION which contains new timing advance used at target cells.• Maximum number of PHYSICAL INFORMATION send to mobile station, NY1, is set by network operator.

• Please find the value of T3105 and NY1 value.

Radio Network Planning and Optimization

Layer3 Messages

Case Study #2 (Foreign cell in Kirkuk)• From idle mode drive test in Kirkuk, we found the a lot of Immediate Assignment Reject when MS try to camp on one foreign cell.• This cell broadcast the frequency of Asiacell band which BCCH 113, BSIC 15.

• Please find the following parameter of foreign cell from layer 3 messages.

CGI

Cell Reselection Hysteresis

RXLEV-ACCESS-MIN

BA List

Maximum Retransmission

T3212

SDCCH TS

Average TA

Practice #2 (Foreign cell in Mosul)

Radio Network Planning and Optimization

Layer3 Messages

• From idle mode drive test in Mosul, we found the a strange cell not belong to Asiacell network. • This cell broadcast the frequency of Asiacell band which BCCH 124, BSIC 00.

• Please find the following parameter of foreign cell from layer 3 messages.

CGI

MS-TXPWR-MAX-CCH

RXLEV-ACCESS-MIN

BS-PA-MFRMS

TX-Integer

CRO

ATT flag

RADIO-LINK-TIMEOUT

Case Study #3 (Wrong BSIC decode)

Radio Network Planning and Optimization

Layer3 Messages

• From the drive test on highway, we find bad quality and drop call problem.

• Please find possible problem and solution for this case.

Practice #3 (Wrong BSIC decode)

Radio Network Planning and Optimization

Layer3 Messages

• We have another problem case found in the highway, the problem is bad quality and drop call.

• Please find possible problem and solution for this case.

Case Study #4 (Paging Success Rate after MCN)

Radio Network Planning and Optimization

Layer3 Messages

• From the statistic, after we activate Missed call Notification service we found lower paging success rate.We have doubt about the paging behavior for the mobile out or coverage and would

like to simulate the problem.