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EPS Network Identifier in LTE
Mobile country code (MCC)
is a 3 digit code, assigned by international telecom union to identify a
country in a mobile communication.
Mobile network code (MNC)
is a 2 to 3 digit code, assigned by national authority.
Public land mobile network identity
(PLMN Id) consists of MCC and MNC. It is used for unique
identification of a PLMN.
Tracking area identity (TAI)
is globally unique and consists of PLMN id and tracking area code (TAC) where
TAC is of 16 bits and it is used to indicate eNB to which Tracking Area the eNB
belongs and it is unique within a PLMN.
It is similar to location area identity (LAI) in GSM.
International Mobile Subscriber
Identity (IMSI) consists of PLMN id and Mobile
subscriber identification number (MSIN). It is unique identification of mobile
(LTE) subscriber and not more than 15 digits.
MME temporary Mobile Subscriber
Identity (M-TMSI) is unique within MME and assigned by
the operator. It is of 32 bits.
SAE Temporary Mobile Subscriber
Identity (S-TMSI) consists of MME code and M-TMSI and
is used to locally identify a UE in short within a MME group (Unique within a
MME Pool).It is of 40 bits.
Globally Unique MME Identity (GUMMEI)
consists of PLMN id, MME group id and MME code. It is used to identify a MME
uniquely in global and is not more than 48 bits.
Globally Unique Temporary UE Identity
(GUTI) consists of GUMMEI and M-TMSI. It is used to
identify a UE between the UE and the MME on behalf of IMSI for security reason
and is not more than 80 bits.
RLT - Radio Link Timeout
RLT - Radio Link Timeout
When SACCH is not decoded this
counter is decreased by 1 when it is reaches to zero it result normal call
drop. In this period if SACCH is decoded counter is increased by 2.
›
This parameter indicate how much time call
maintained when radio environments is bed.
›
If RLT value is high then call is sustain longer
time. it is affected to customer
customers perception.
›
Highway and in building cells have higher value
of RLT parameter and it is give better improvement of call drops.
›
This parameter is define in AMRFR & AMRHR
and also Non AMRFR & Non AMRHR
›
We can also check this on TEMS radio parameter
window
one time slot lasts 0.577ms,
Bursts period is 4.615ms
1 SACCH Period= 4.615X104
bursts (4x26=104 bursts) = 480ms
Now Radio Link Time Counter:-
It is depend on SACCH blocks.
This parameter defines the
maximum value of the radio link counter expressed in SACCH blocks. Range of 4 –
64 in step size of 4.
Value of RLT. Normally 16, 20,
24.
If RLT value is 16 then call is
sustain around- 7.6 Sec( 16 *480ms) when SACCH will not decoded
If RLT value is 20 then call is
sustain around -9.6 Sec( 20*480ms)
If RLT value is 24 then call is
sustain around -11.5 Sec( 24*480ms)
RLT Measure in TEMS Radio
Parameters
RL Timeout Counter (Cur) : This
parameter define the maximum value of the radio link counter expressed in SACCH
blocks. Range of 4 – 64 in step size of 4. it shows current value of RLT.
Decrease by 1 but increase by 2. When it reaches zero it results in normal DROP
Call.
RL Timeout Counter (MAX) : This
parameter define the maximum value of the radio link counter expressed in SACCH
blocks. Range of 4 – 64 in step size of 4. it shows current value of RLT.
Normally 16, 20, 24.
GSM RF RESPONSIBILITIES
Cells Optimization for Achieving Radio KPI’s:
- NETWORK & Cell LEVEL KPIs: SDCCH DROPS, SDCCH BLOCKING, SDCCH CONGESTION, TCH DROPS, TCH BLOCKING, TCH CONGESTION, TASR, HOSR, RASR and PSR.
∆
Monitoring of 2G Radio Network KPIs using M2000i and CME tool.
∆
Ensuring Network Quality by Analyzing Daily and Weekly worst cells and
troubleshooting
∆
Definition and configuration of KPIs using M2000
∆
Identify & Resolve RF Problems either due to parameters or hardware
∆
Cell level Radio Parameter audit & Tuning and clear discrepancies
∆
Audit of KPI Counter and formula
∆
Responsibility of AMR half rate tuning of circle level.
∆
Involve in NQI Improvement as per grade of services
∆
Working on critical network issues with NHQ, TAC and Vendor Team.
∆
Analysis of TCH and SDCCH congestion cell on daily basis and resolving
the problem of cells having higher congestion by addition of TRUs / getting
dblocked
∆
Reducing interference, neighbor orientation for best possible coverage
and improving KPIs.
∆
Macro cell and Microcell Planning to offload adjacent site and improved
coverage.
∆
Coverage enhancement solution using equipment viz. High Gain Antenna, TMA,
Outdoor Repeaters, extending IBS, etc.
∆
Daily analysis of Network Performance and Troubleshooting according to
the problems existing in the network.
∆
Migration plan to share the traffic.
∆
Analyzing Layer 3 Message & Layer 2 Controls to find cause of
Handover failures, Blocked Calls Dropped Calls & Abnormal network
behaviors.
∆
New Sites Optimization & Acceptance to Customer
∆
Analyzing Log files of Drive Tests for Coverage, Quality Problems and
Handover Optimization
∆
Identify DIP reason when KPI degrade than previous day or week.
∆
Handled the TRAI audit activities from RF end.
∆
Planning & design of IBS.
∆
RF Planning for Coverage & Capacity mobile cell sites.
∆
LAC / PCU Planning.
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