2G NOKIA Feature

1. RG301726: Uplink Min
RXLevel Based Access
DN09167888
Issue 01
Approval Date 2014-15-20

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RG301726: Uplink Min RXLevel Based Access
2 DN09167888 Issue: 01

3. Table of Contents
This document has 17 pages
1 Introduction to the feature.............................................................. 6
2 Benefits.......................................................................................... 7
3 Requirements.................................................................................8
4 Functional description.................................................................... 9
5 System impact..............................................................................10
6 User interface............................................................................... 11
7 Activating RG301726: Uplink Min RX level Based Access feature..
13
8 Verifying RG301726: Uplink Min RX Level Based Access feature...
14
9 Deactivating RG301726: Uplink Min RX Level Based Access
feature.......................................................................................... 16
10 Abbreviations............................................................................... 17
RG301726: Uplink Min RXLevel Based Access
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4. List of Figures
Figure 1 Filtering of nonviable calls on RACH phase thus improving network
performance......................................................................................... 9
RG301726: Uplink Min RXLevel Based Access
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5. List of Tables
Table 1 Software requirements for different network elements......................... 8
Table 2 New parameters................................................................................. 11
Table 3 Modified parameters........................................................................... 11
Table 4 Error codes......................................................................................... 11
Table 5 Counters.............................................................................................12
RG301726: Uplink Min RXLevel Based Access
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6. 1 Introduction to the feature
The RG301726: Uplink Min RX level Based Access feature is aimed to improve SDCCH
DCR KPIs (drop call ratio key performance indicators), by filtering out non-viable call
attempts in RACH phase. Amount of SDCCH drops is reduced by filtering out RACH
bursts received from MS on CCCH that have lower RX level for uplink than given value
of RACH Drop RX Level Threshold parameter.
With the RG301726: Uplink Min RX level Based Access feature also Resource Access
Measurement RACH DROP LOW UL RX LEVEL counter is introduced to count filtered
call attempts.
Introduction to the feature RG301726: Uplink Min RXLevel Based Access
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7. 2 Benefits
The RG301726: Uplink min RxLevel based access feature benefits by improving the
Network Performance and DCR KPI’s when a threshold is set according to the planned
coverage. The BSS also works more efficiently as a very low RX level RACH does not
lead to SDCCH reservation.
RG301726: Uplink Min RXLevel Based Access Benefits
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8. 3 Requirements
Software requirements
Table 1 Software requirements for different network elements
Network element Required software release
NetAct 8 EP2
BSC S16_2
Flexi EDGE EX5_2
Flexi Multiradio EX5_2
BTS MMI not supported
ASW/BSW ASW
Hardware requirements
This feature does not require any new or additional hardware.
Requirements RG301726: Uplink Min RXLevel Based Access
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9. 4 Functional description
Functional overview
The RG301726: Uplink Min RX level Based Access feature reduces amount of the
SDCCH drops through providing a modifiable limit for Uplink min RxLevel based access.
In addition to existing Rxlev Access Min (DL) parameter that must be exceeded prior
to MS sending RACH, the Segment level BTS object parameter - RACH Drop Rx
Level Threshold for UL is used to filter out nonviable calls on RACH phase in a BTS.
With the RACH Drop Rx Level Threshold parameter you define the threshold for
the received signal level during network access used by BTS. When Uplink Min Rx Level
Access threshold is set to its maximum value, BTS does not drop any valid RACHs.
A Resource Access Measurement has a RACH DROP LOW UL RX LEVEL counter
which indicates the number of RACHs drops due to a too low uplink RX Level on a
CCCH. The BSC increases value of the counter by the value of Dropped Random
Access bursts when Dropped Random Access burst is present in Supplementary
Information field of RACH load in CCCH LOAD INDICATION message.
With the RG301726: Uplink Min RX level Based Access feature, DCR KPI’s is improved,
when a threshold is set according to the planned coverage.
The RG301726: Uplink Min RX level Based Access feature is supported when the BCCH
TRX is in the BCF site type which supports the feature.
Figure 1 Filtering of nonviable calls on RACH phase thus improving network
performance
BTS
RACH(withlowRXlevel)
SDCCHallocation
The RG301726: Uplink Min RX level Based Access is a licensed feature. Operator is not
allowed to configure this feature without license. If the license expired and the feature is
configured into use in the Segment, operator is not allowed to unlock BTS.
The BTS rejects RACH in CCCH if the RACH Drop Rx Level Threshold parameter
is not reached. The BTS also deletes a RACH burst if it is received by the BTS at a very
low RX level and informs the BSC about the deletion via the CCCH LOAD INDICATION
message. However, RACH bursts for emergency calls or those received on non CCCH
are not filtered. Also RACH bursts for Packet-Channel access (RACH bursts leading to
P-CHANNEL Required messages on Abis interface) are not filtered.
RG301726: Uplink Min RXLevel Based Access Functional description
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10. 5 System impact
This chapter is divided into the following sections:
• Interdependencies between features
• Impacts on interfaces
Interdependencies between features
The BTS software automatically switches the RG301726: Uplink min RxLevel based
access feature off if the RG602124: Composite Multi Site Transmission feature is
configured.
Impacts on interfaces
1. Interfaces impacted by the RG301726: Uplink min RxLevel based access feature
• Abis O&M interface
The BSC delivers the RACH Drop RX Level Threshold parameter
to the BTS over the Abis O&M interface.
• Abis telecom
The BTS uses a CCCH LOAD INDICATION message to inform the BSC about
the amount of RACH burst periods during which the received signal level has
been below a given threshold.
System impact RG301726: Uplink Min RXLevel Based Access
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11. 6 User interface
This chapter is divided into the following sections:
• Parameters
• MML commands
• System responses to failures
• Alarms
• Measurements and counters
Parameters
The following table lists parameters introduced with this feature.
Table 2 New parameters
Full name Abbreviated
name
Managed object Parameter type Range
RACH Drop RX
Level Threshold
RXLT BTS Segment level
BTS object
UI value: -115..-
47, in step of
1dBm; 255 Not in
Use
The following table lists parameters modified by this feature.
Table 3 Modified parameters
Full name Abbreviated name Managed object
BSC options - BSC
MML commands
The following MML commands are used to handle the feature:
• EQM command to modify BTS parameters
• EQO command to output BTS parameters
System responses to failures
This feature introduces the error codes shown in the following table.
Table 4 Error codes
Output Number Description
UPLINK MIN RX LEVEL
BASED ACCESS FEATURE
IS NOT IN USE IN BSC
00B10H / 2832d Uplink Min RX level Based
Access feature is not enabled
in BSC. Either feature license
is not valid or the feature
status is in a disabled state.
Alarms
There are no alarms related to this feature.
RG301726: Uplink Min RXLevel Based Access User interface
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12. Measurements and counters
The following table lists counters introduced with this feature.
Table 5 Counters
Counter ID Counter name Measurement
003069 RACH DROP LOW UL RX
LEVEL
3 Resource Access
Measurement
User interface RG301726: Uplink Min RXLevel Based Access
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13. 7 Activating RG301726: Uplink Min RX level
Based Access feature
Before you start
• The RG40 Release Upgrade License must be installed in the BSC before changing
the RG301726: Uplink Min RX level Based Access feature license to ON state.
• Make sure that the RG301726: Uplink Min RX level Based Access feature license is
installed on the BSC.
1 Check that the license covering the RG301726: Uplink Min RX level Based
Access feature has been installed.
Use the following MML command:
ZW7I:LIC,FULL:LIC=<licence code>;
Option Description
Follow step 2. If the license has been installed.
Install the license and set state to ON.
Use the following MML command:
ZW7L:LIC=<licence code>:ON;
If the license has not been installed.
2 Check the value of the RG301726: Uplink Min RX level Based Access feature
state.
Option Description
Follow step 3. If the license feature state is ON.
Change the feature state to ON.
Use the following MML command:
ZW7M:FEA=5206:ON;
If the feature state is OFF or CONF.
3 Modify the Segment level RACH Drop RX Level Threshold parameter to
other value than Not Used.
Use the following MML command:
ZEQM:BTS=<BTS id>:RXLT=<rxlt value>;
BTS starts to use the new limit for access and counter.
RG301726: Uplink Min RXLevel Based Access Activating RG301726: Uplink Min RX level Based
Access feature
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14. 8 Verifying RG301726: Uplink Min RX Level
Based Access feature
1 Adjust the RXLT -parameter value to -110 dBm.
Use the following MML command:
ZEQM:BTS=<BTS id>:RXLT=-110;
2 Modify measurements of Resource Access Measurement (TPM).
Use the following MML command:
ZTPM:MEASUR,CCCH_ACC:ALL,0-0-24-0,15:;
3 Start measurements of Resource Access Measurement (TPS).
Use the following MML command:
ZTPS:MEASUR,CCCH_ACC::;
4 Wait until the measurement is enabled and interrogate it (TPI).
Use the following MML command:
ZTPI:MEASUR,CCCH_ACC;
Wait until the operational state changes to ENABLED.
5 Setup a call with uplink RX level of -113 dBm.
Expected outcome
Call is not successful as the RACH is dropped by the BTS. Counter 003069 RACH
DROP LOW UL RX LEVEL is incremented.
6 Setup a call with uplink RX level of -90 dBm.
Expected outcome
Call is successful and counter 003069 RACH DROP LOW UL RX LEVEL is not
incremented.
7 Check the measurement data. At the end of the measurement period, check the
measurement data in Nokia NetAct or in the BSC using the MEFICO tool.
Expected outcome
Counter 003069 RACH DROP LOW UL RX LEVEL of Resource Access
Measurement is incremented.
For more information, see:
• Reporter and Performance Measurement Principles in NetAct documentation
• Converting BSC Measurement and Observation Files with MEFICO
Verifying RG301726: Uplink Min RX Level Based
Access feature
RG301726: Uplink Min RXLevel Based Access
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15. 8 Stop the Resource Access Measurement (TPE).
Use the following MML command:
ZTPE:MEASUR,CCCH_ACC:;
RG301726: Uplink Min RXLevel Based Access Verifying RG301726: Uplink Min RX Level Based
Access feature
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16. 9 Deactivating RG301726: Uplink Min RX Level
Based Access feature
1 Deactivate the RG301726: Uplink Min RX Level Based Access feature from
Segment by modifying the RACH Drop Rx Level Threshold parameter to
default value Not Used (255).
Use the following MML command:
ZEQM:BTS=<BTS id>:RXLT=255;
2 Change the RG301726: Uplink Min RX Level Based Access feature state to OFF.
Use the following MML command:
ZW7M:FEA=5206:OFF;
Deactivating RG301726: Uplink Min RX Level Based
Access feature
RG301726: Uplink Min RXLevel Based Access
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17. 10 Abbreviations
CS Circuit-switched
DCR Drop Call Rate
DL Downlink
KPI Key Performance Indicators
MS Mobile Station
SDCCH Stand-alone Dedicated Control Channel
UL Uplink
RG301726: Uplink Min RXLevel Based Access Abbreviations
Issue: 01 DN09167888 17