Introduction to the RAN14 0 Feature Layered Paging in URA PCH V1 03

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Introduction to the RAN14.0 Feature-Layered Paging in URA_PCH

Wireless Product Rollout Department

Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page 3

About This Course This course is based on the radio access network (RAN) 14.0 version.


Objectives After completing this course, you will be able to: Understand the values and application

scenarios of the Layered Paging in URA_PCH feature.

Understand the basic theory of the Layered Paging in URA_PCH feature.

Explain the basic principles of the Layered Paging in URA_PCH feature.

Enable and verify the Layered Paging in URA_PCH feature based on manuals.


Contents1 Feature Description2 Feature Planning3 Feature Deployment4 Performance Optimization5 Operation Maintenance and Fault Handling6 Acronyms & Abbreviations


Feature DescriptionA large number of unnecessary paging messages have been generated because of rapid mobile network development and exponential growth of smartphone use in recent years. This has led to an explosive increase in signaling overheads. To reduce high signaling overheads, Huawei applied the CELL_PCH state to commercial networks in RAN 12.0 by setting related parameters on the radio network controller (RNC).When the CELL_PCH solution is used with the feature WRFD-020500 Enhanced Fast Dormancy, UEs on the related white list are configured properly and some UEs enter the CELL_PCH state as required. This reduces signaling overheads generated during a network access process.UEs in the CELL_PCH state (hereinafter called CELL_PCH UEs) exchange signaling with the RAN every time they perform a cell update. This affects forward access channel (FACH) and random access channel (RACH) traffic. Statistics show that the number of signaling messages exchanged during cell updates accounts for 3% to 15% of FACH traffic.To reduce the signaling generated during cell update, Huawei applied the URA_PCH state to commercial networks in RAN 13.0 by setting related parameters on the RNC.When the URA_PCH solution is used with the feature WRFD-020500 Enhanced Fast Dormancy, UEs on the related white list are configured properly and some UEs enter the URA_PCH state as required.In this way, UEs in the URA_PCH state (hereinafter called URA_PCH UEs) do not exchange signaling with the RAN every time they perform a cell update, and therefore signaling overheads are reduced.However, the URA_PCH solution may easily trigger paging channel (PCH) congestion, which easily occurs after WAP Push services become popular along with the explosive growth of smartphone use.For WAP Push services (for example, Push e-mail), the RNC actively pages smartphones where the Packet Data Protocol (PDP) is applied and pushes WAP content to these smartphones. To page a URA_PCH UE, the RNC sends the PAGING TYPE 1 message in the entire UTRAN registration area (URA). If the URA has 2000 cells, the PAGING TYPE 1 message is sent to 2000 cells, which can easily trigger PCH congestion.Huawei introduced Layered Paging in URA_PCH in RAN14.0 to address the PCH congestion issue.


Related Feature Required feature

None.

Mutually exclusive feature None.

Affected feature None.

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Impact of Layered Paging in URA_PCH When the Layered Paging in URA_PCH feature is activated, and

the CELL_PCH state is not enabled, the number of paging messages is reduced. The reason is that the Layered Paging in URA_PCH feature allows the paging of idle UEs only in certain cells, instead of the entire location area. This increases the PCH capacity.

When the Layered Paging in URA_PCH feature is activated and the CELL_PCH state is enabled, the number of times cells are reselected when UEs move between cells is reduced. This increases the FACH and RACH capacity. However, the Layered Paging in URA_PCH feature causes a slight decrease in the PCH capacity, because Cell_PCH UEs are paged in the cell scale whereas URA_PCH UEs are paged in the URA scale.

When the Layered Paging in URA_PCH feature is activated, and the URA_PCH state is enabled, the number of signaling messages generated when URA_PCH UEs are paged is reduced, and therefore the PCH capacity is increased.

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Contents1 Feature Description2 Feature Planning3 Feature Deployment4 Acceptance and Maintenance5 Precautions (FAQ)6 Acronyms & Abbreviations

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Activation Suggestion and Information Collection

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Before activate Layered Paging in URA_PCH, perform the following steps to collect required information.1. Analyze the traffic model of the target area, and evaluate the

penetration of smart phones.• If there are a small number of smartphones in the live network,

you do not need to enable this feature. • If there are a large number of smartphones in the live network, go

to the next step. 2. Evaluate the system resource utilization of the target area.

• Use counters to measure the FACH or RACH bandwidth that is used to carry signaling messages involved in cell reselection.

• Enable this feature when large FACH or RACH bandwidth is used to carry signaling messages involved in cell reselection.

• You can enable this feature when a large amount of FACH or RACH resources are available.

• You are advised not to enable this feature when the CELL_PCH state is enabled and the PCH utilization is high (for example, higher than 85%).

3. Check whether users are delay-sensitive.• Communicate with users to determine whether they are delay-

sensitive and whether to use the real-time service function based on the communication results.


Version/License Planning

Version configurationBSC6900V900R014C01 and later versionsLicense controlThe Layered Paging in URA_PCH feature is under license control.Feature conflictNone.Required featureNone.


Network PlanningNone.


Overall Deployment Process

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You only need to set parameters to enable the Layered Paging in URA_PCH feature.


Deployment RequirementsPerform the following steps to enable the Layered Paging in URA_PCH

feature:1. Activate the license for this feature.2. Based on data preparation, enable this feature by running SET

URRCTRLSWITCH on the BSC6900 and set related parameters as follows: For real-time services, set RAPCH_LAYERED_PAGING_RT_SWITCH under

PROCESSSWITCH4 to ON. For non-real-time services, set URAPCH_LAYERED_PAGING_NRT_SWITCH under

PROCESSSWITCH4 to ON.

Perform the following steps after enable this feature: 1. Reduce the threshold of CellReSelectCounter steadily so that the

number of URA_PCH UEs in the network can increase. 2. Check values of key performance indicators (KPIs). If KPI values

are within the normal range, reduce the threshold of CellReSelectCounter until the lower limit is reached.

3. After the RNC operates for a certain period of time, check the values of the KPIs related to this feature.

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Performance MonitoringWhen the Layered Paging in URA_PCH feature is enabled, collect statistics about the following counters in the live network, and determine network performance based on the following formulas: • First-layer success rate of layered paging on an RNC

The first layer success rate of real-time service layered paging in URA_PCH = VS.Paging1.Succ1.URA.RealTime.Cell/ VS.Paging1.Att1.URA.RealTi∑ ∑

me.CellThe first layer success rate of non-real-time service layered paging in URA_PCH = VS.Paging1.Succ1.URA.NoneRealTime.Cell/ VS.Paging1.Att1.URA.No∑ ∑

neRealTime.Cell• Final success rate of layered paging on an RNC

The final success rate of real-time service layered paging in URA_PCH = VS.Paging1.TotalSucc.URA.RealTime.Cell/ ∑ ∑

VS.Paging1.Att1.URA.RealTime.CellThe final success rate of non-real-time service layered paging in URA_PCH = VS.Paging1.TotalSucc.URA.NoneRealTime.Cell/ ∑ ∑

VS.Paging1.Att1.URA.NoneRealTime.Cell


Performance Parameter Optimization When the first-layer success rate of layered paging in

URA_PCH on an RNC is low, the mobility of UEs in a specific area is high. Therefore, it is recommended that the Layered Paging in URA_PCH feature be.

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Customized Parameters and Traffic MeasurementID Description

Value Range

Recommended Value MML Command Level

URAPCH_LAYERED_PAGING_RT_SWITCH

This parameter specifies whether the Layered Paging in URA_PCH feature is enabled for real-time services.

ON, OFF OFF SET URRCTRLSWITCH RNC

URAPCH_LAYERED_PAGING_NRT_SWITCH

This parameter specifies whether the Layered Paging in URA_PCH feature is enabled for non-real-time services.

ON, OFF OFF SET URRCTRLSWITCH RNC

Counter Description

VS.Paging1.Att1.URA.RealTime.Cell Number of the first layer paging attempts of real-time service in URA PCH.

VS.Paging1.Succ1.URA.RealTime.Cell Number of the first layer paging successful attempts of real-time service in URA PCH.

VS.Paging1.Att1.URA.NoneRealTime.Cell Number of the first layer paging attempts of non-real-time service in URA PCH.

VS.Paging1.Succ1.URA.NoneRealTime.Cell

Number of the first layer paging successful attempts of non-real-time service in URA PCH.

VS.Paging1.TotalSucc.URA.RealTime.Cell

Number of the total paging successful attempts of real-time service in URA PCH.

VS.Paging1.TotalSucc.URA.NoneRealTime.Cell

Number of the total paging successful attempts of non-real-time service in URA PCH.


Fault Handling None.

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ContentsLayered Paging in URA_PCH Feature1 Feature Description2 Feature Planning3 Feature Deployment4 Performance Optimization5 Operation Maintenance and Fault Handling6 Acronyms & Abbreviations


Acronyms & Abbreviations URA: UTRAN registration area PCH: paging channel PRACH: physical random access channel

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Introduction to the RAN14 0 Feature Layered Paging in URA PCH V1 03

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