CE Overbooking(RAN14.0_03).PDF

CE Overbooking RAN14.0

Feature Parameter Description

Issue 03

Date 2012-11-30

HUAWEI TECHNOLOGIES CO., LTD.

Copyright Huawei Technologies Co., Ltd. 2012. All rights reserved.

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WCDMA RAN

CE Overbooking Contents

Issue 03 (2012-11-30) Huawei Proprietary and Confidential

Copyright Huawei Technologies Co., Ltd.

ii

Contents

1 Introduction ................................................................................................................................ 1-1

1.1 Scope ............................................................................................................................................ 1-1

1.2 Intended Audience......................................................................................................................... 1-1

1.3 Change History .............................................................................................................................. 1-1

2 Overview...................................................................................................................................... 2-1

3 Technical Principles ................................................................................................................. 3-1

4 CAC Based on NodeB Credit Resources ........................................................................... 4-1

5 Basic Congestion Related to NodeB Credit Resources ................................................. 5-1

6 TTI Selection During PS BE Service Setup or Reconfiguration ................................... 6-1

7 Admission-CE-based Dynamic TTI Adjustment for a Single BE Service over HSUPA ........................................................................................................................................................... 7-1

8 Impact on the Network............................................................................................................. 8-1

8.1 Capacity and Performance ............................................................................................................ 8-1

8.2 Impact on Other Features ............................................................................................................. 8-2

9 Engineering Guidelines ........................................................................................................... 9-1

9.1 When to Use CE Overbooking ...................................................................................................... 9-1

9.2 Information to Be Collected ........................................................................................................... 9-1

9.3 Deployment ................................................................................................................................... 9-1

9.3.1 Deployment Requirements ................................................................................................... 9-1

9.3.2 Data Preparation................................................................................................................... 9-1

9.3.3 Precautions ........................................................................................................................... 9-2

9.3.4 Initial Configuration ............................................................................................................... 9-2

9.3.5 Activation Check ................................................................................................................... 9-2

9.3.6 Feature Deactivation ............................................................................................................ 9-2

9.3.7 Example ................................................................................................................................ 9-2

9.4 Performance Optimization ............................................................................................................. 9-2

9.5 Troubleshooting ............................................................................................................................. 9-4

10 Parameters ............................................................................................................................. 10-1

11 Counters .................................................................................................................................. 11-1

12 Glossary .................................................................................................................................. 12-1

13 Reference Documents ......................................................................................................... 13-1

WCDMA RAN

CE Overbooking 1 Introduction



1-1

1 Introduction

1.1 Scope

This document describes WRFD-140212 CE Overbooking, including implementation principles, impact on related features, network impact, and engineering guidelines.

1.2 Intended Audience

This document is intended for:

Personnel who work with Huawei WCDMA products or systems

Personnel who need to understand CE Overbooking

1.3 Change History

This section provides information about the changes in different document versions.

There are two types of changes, which are defined as follows:

Feature change: refers to a change in the CE Overbooking feature of a specific product version.

Editorial change: refers to a change in wording or the addition of information that was not described in the earlier version.

Document Issues

The document issues are as follows:

03 (2012-11-30)

02 (2012-07-20)

01 (2012-04-30)

Draft A (2012-02-15)

03 (2012-11-30)

This is the third commercial release for RAN14.0.

Compared with issue 02 (2012-07-20) for RAN14.0, issue 03 (2012-11-30) for RAN14.0 includes the

following changes.

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1-2

Change Type Change Description Parameter Change

Feature change Changed the following description in Table 3-1:

Original:

For HSUPA UEs, the NodeB adjusts the credit resource usage of admitted UEs to be less than or equal to the calculation result of the following formula:

Credit resource usage = Max (Credit resources required for ensuring the GBR, Credit resources required for transmitting one RLC PDU)

If the UEs use a 10 ms TTI, the adjustment is based on the UE rate.

If the UEs use a 2 ms TTI, the adjustment is based on the UE rate and the REVDPARA4 parameter.

Revised:

For HSUPA UEs using a 10 ms TTI, the NodeB adjusts the amount of credit resources consumed by admitted UEs based on the UE data rate. The amount after adjustment does not exceed the amount of credit resources required for transmitting one RLC PDU.

For HSUPA UEs using a 2 ms TTI, the NodeB adjusts the amount of credit resources consumed by admitted UEs based on the UE data rate and the setting of the REVDPARA4 parameter. The amount after adjustment does not exceed the amount of credit resources required for transmitting one RLC PDU.

None.

Editorial change Optimized the description in section 8.1 "Capacity

and Performance."

None.

Optimized the description in section 9.1 "When to

Use CE Overbooking."

None.

Optimized the description in section 9.2

"Information to Be Collected."

None.

02 (2012-07-20)

This is the second commercial version of the document in RAN14.0.

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1-3


Feature change There is a possibility that enabling CE Overbooking increases the admission rejections over the Iub interface. For details of the impact of CE Overbooking, see section 8.1 "Capacity and Performance."

None

Editorial change Added the procedures for deploying features used in this document. For details, see chapter 9 "Engineering Guidelines."

None

01 (2012-04-30)

This is the first draft of the document for RAN14.0.


Feature change None None

Editorial change Deleted the original sections 8.2 "Hardware" and 9.3 "Network Planning". These sections describe hardware dependency of the feature, which are described in the Configuring CE Overbooking in Feature Activation Guide.

None

Optimized the descriptions about credit resource consumption of admitted UEs with CE Overbooking enabled. For details, see Table 3-1 in chapter 3 "Technical Principles."

None

Draft A (2012-02-15)

This is the first draft of the document for RAN14.0.

This is a new document.

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CE Overbooking 2 Overview



2-1

2 Overview

After WRFD-010638 Dynamic CE Resource Management is applied, the RNC calculates the credit resource usage of an admitted HSUPA UE by using the following formula:

Credit resource usage = Max (Credit resources required for ensuring the GBR, Credit resources required for transmitting one RLC PDU)

In the preceding formula, GBR stands for guaranteed bit rate and RLC PDU stands for Radio Link Control packet data unit. The RNC performs this calculation to ensure HSUPA user experience. However, the actual CE usage of the NodeB is lower than the calculated credit resource usage of the RNC. This is because the NodeB calculates the actual CE usage based on the UE rate. The UE rate is lower than the GBR or the rate at which an RLC PDU is transmitted in most cases due to the high penetration rate of smart phones with a 2 ms HSUPA transmission time interval (TTI). As a result, the RNC may reject new UE access attempts even if the actual CE usage of the NodeB is low. This limits the RNC's capability to perform admission control based on credit resource usage.

To address this issue, Huawei introduces CE Overbooking. With this feature, the NodeB calculates the actual CE usage of admitted UEs, includes the calculated CE usage in a private information element (IE) in the Common Measurement Report message, and sends the report to the RNC every measurement report period that is configured by the TenMsecForUlBasicMeas parameter. The RNC then directly uses the reported CE usage as the credit resource usage. This maximizes the RNC's capability to perform admission control based on credit resource usage.

When the penetration rate of smart phones with a 2 ms HSUPA TTI is high, the average HSUPA service throughput is low, and this feature provides the following benefits:

Reduces the credit resource usage of admitted UEs.

Increases the number of admitted UEs and the number of HSUPA UEs with a 2 ms TTI.

Increases the cell uplink throughput when Uu and Iub resources are sufficient.

Figure 2-1 shows the working principles of CE Overbooking.

Figure 2-1 CE Overbooking

This feature applies only to uplink CE resources.

Before enabling this feature, Dynamic CE Resource Management must be enabled. For details about Dynamic CE Resource Management, see the HSUPA Feature Parameter Description.

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CE Overbooking 2 Overview



2-2

NOTE

If layer 2 enhancement is enabled, the size of the RLC PDU provided in the preceding formula equals that of the smallest RLC PDU. If layer 2 enhancement is disabled, the size of the RLC PDU is fixed. For details about the RLC PDU size, see the HSPA Evolution Feature Parameter Description.

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CE Overbooking 3 Technical Principles



3-1

3 Technical Principles

CE Overbooking is under NodeB license control and has no switch parameter on the RNC or NodeB side.

The credit resource usage that the NodeB periodically calculates and reports to the RNC involves the credit resource usage of R99 UEs and that of HSUPA UEs.

Table 3-1 describes the methods for calculating the credit resource usage before and after this feature is activated and presumes that the Dynamic CE Resource Management feature has been enabled.

Table 3-1 Credit resource calculation methods before and after activating this feature

CE Overbooking

Credit Resources Consumed by Admitted UEs

Not activated The RNC calculates the amount of credit resources consumed by admitted UEs as follows:

For R99 UEs, the RNC calculates the amount of credit resources consumed by admitted UEs based on the maximum bit rate (MBR).

For HSUPA UEs, the RNC calculates the amount of credit resources consumed by admitted UEs using the following formula:

Amount of credit resources consumed by admitted UEs = Max (Amount of credit resources required for ensuring the GBR, Amount of credit resources required for transmitting one RLC PDU)

Activated The NodeB calculates the amount of credit resources consumed by admitted UEs as follows:

For R99 UEs, the NodeB calculates the amount of credit resources consumed by admitted UEs based on the MBR.

For HSUPA UEs using a 10 ms TTI, the NodeB adjusts the amount of credit resources consumed by admitted UEs based on the UE data rate. The amount after adjustment does not exceed the amount of credit resources required for transmitting one RLC PDU.

For HSUPA UEs using a 2 ms TTI, the NodeB adjusts the amount of credit resources consumed by admitted UEs based on the UE data rate and the setting of the REVDPARA4 parameter. The amount after adjustment does not exceed the amount of credit resources required for transmitting one RLC PDU.

NOTE

REVDPARA4 indicates the minimum CE reserved for admitted 2 ms TTI HSUPA UE. Its

value rang is 1 to 8 with the default value of 4 (unit: CE). If this parameter is set to a value beyond its value range, the system uses the default parameter value. A smaller value of this parameter leads to a larger number of admitted users. In this case, the call drop rate may increase and user experience cannot be guaranteed. A larger value of this parameter leads to a smaller number of admitted users. In this case, the call drop rate does not increase and user experience can be guaranteed.

In the uplink, one CE equals two credits.

In the downlink, one CE equals one credit.

This feature reduces the credit resource usage of admitted UEs and increases the remaining credit resources. This has the following advantages:

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CE Overbooking 3 Technical Principles



3-2

More UEs can be admitted.

More HSUPA UEs are assigned with 2 ms TTI during a PS best effort (BE) service setup or reconfiguration.

Basic congestion of credit resources is relieved.

The probability of admission-CE-based dynamic TTI adjustment from 2 ms to 10 ms for BE services is reduced.

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CE Overbooking 4 CAC Based on NodeB Credit Resources



4-1

4 CAC Based on NodeB Credit Resources

When receiving a service setup request, the RNC makes an admission decision based on credit resources as follows:

For a radio resource control (RRC) connection setup request, the admission is successful if the remaining credit resources at the local cell group (if any) and NodeB levels are sufficient for the RRC connection setup.

For a handover service, the admission is successful if the remaining credit resources at the local cell group (if any) and NodeB levels are sufficient for the handover service.

For other services, the RNC must check that the amount of the remaining credit resources at the local cell

group (if any) and NodeB levels is greater than or equal to UlHoCeResvSf after new services are admitted.

If so, the admission is successful.

CE Overbooking performs service admission and optimization based on the preceding decision procedure. Activating CE Overbooking brings the following advantages:

The NodeB-reported credit resources consumed by admitted users decrease and therefore the remaining credit resources on the RNC increase, indicating that the RNC can admit and serve more users.

The NodeB baseband board uses different processing specifications for users with different uplink bearer services, for example, HSUPA TTI 2 ms services, HSUPA TTI 10 ms services, and R99 services. CE Overbooking enables the network to admit more users. Therefore, it is good practice to enable RESERVED_SWITCH_1_BIT5 of RsvSwitch1. When multiple users access the network,

If RsvSwitch1:RESERVED_SWITCH_1_BIT5 is disabled, the system attempts to admit all new users using the highest service bearers supported by the terminal. In this way, accessed users occupy too many uplink processing specifications and therefore the total number of accessed users decreases.

If RsvSwitch1:RESERVED_SWITCH_1_BIT5 is enabled, the NodeB baseband board dynamically selects proper uplink service bearers for users to maximize the number of accessed users according to actual NodeB processing specifications.

For details about Call Admission Control (CAC) based on NodeB credit resources, see the Call Admission Control Feature Parameter Description.

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CE Overbooking

5 Basic Congestion Related to NodeB Credit

Resources



5-1

5 Basic Congestion Related to NodeB Credit Resources

Basic congestion at the local cell group or NodeB level is triggered when the following condition is met:

Remaining uplink credit resources at the local cell group or NodeB level < Credit resources mapped to UlLdrCreditSfResThd

where

UlLdrCreditSfResThd can be set by running the MML command ADD UNODEBLDR.

CE Overbooking brings the following advantages:

Increases the remaining uplink credit resources.

Relieves basic congestion because the preceding condition is less likely to be met.

For details about basic congestion related to NodeB credit resources, see the Load Control Feature Parameter Description.

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CE Overbooking

6 TTI Selection During PS BE Service Setup or

Reconfiguration



6-1

6 TTI Selection During PS BE Service Setup or Reconfiguration

When a PS BE service is set up or reconfigured, TTI selection is implemented. The TTI for an HSUPA UE is set to 2 ms if all the following conditions are met:

The UE and the NodeB support 2 ms TTI.

MAP_HSUPA_TTI_2MS_SWITCH under the MapSwitch parameter is set to ON.

Credit resources are sufficient.

If DRA_BASE_RES_BE_TTI_RECFG_SWITCH and DRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH under the DraSwitch parameter are set to ON, one of the following conditions must be met:

The ResourceOption parameter is set to RTWP, and the Uu resources are sufficient.

The ResourceOption parameter is set to Iub, and the Iub resources are sufficient.

The ResourceOption parameter is set to CE, and the CE resources are sufficient.

The MBR of the UE is greater than or equal to BeHsupa2msTtiRateThs.



Increases the number of HSUPA UEs with a 2 ms TTI. Compared with 10 ms TTI, 2 ms TTI enables HSUPA UEs to achieve a higher peak rate and a shorter scheduling delay, which improves user experience.

For details about dynamic TTI adjustment, see the HSUPA TTI Selection Feature Parameter Description.

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CE Overbooking

7 Admission-CE-based Dynamic TTI Adjustment for

a Single BE Service over HSUPA



7-1

7 Admission-CE-based Dynamic TTI Adjustment for a Single BE Service over HSUPA

The TTI for an HSUPA UE processing BE services is switched from 2 ms to 10 ms when all the following conditions are met:

The credit resources at the local cell group or NodeB level are smaller than those specified by UlTtiCreditSfResThd, indicating that the credit resources are insufficient.

The UE throughput is lower than the product of UpRatioFor2msTo10msBaseCE and BeHsupa2msTtiRateThs.



Reduces the probability of admission-CE-based dynamic TTI adjustment from 2 ms to 10 ms.

After CE Overbooking is activated, it is recommended that DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH under the DraSwitch parameter be set to ON. If DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH is set to ON, the TTI for an HSUPA UE can be switched from 2 ms to 10 ms when CE resources are congested. If DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH is not set to ON, CE resources may be insufficient to transmit one RLC PDU, which may result in Traffic Radio Bearer (TRB) reset and increase the call drop rate.

For details about dynamic TTI adjustment, see the HSUPA TTI Selection Feature Parameter Description.

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CE Overbooking 8 Impact on the Network



8-1

8 Impact on the Network

8.1 Capacity and Performance

System Capacity

Since CE Overbooking reduces the uplink credit resources consumed by online users, it impacts on system capacity in the following scenarios:

In scenarios where a large number of admission rejections occur due to severe congestion of uplink credit resources, CE Overbooking enables more UEs to be admitted. CE Overbooking also increases the average cell throughput if Uu and Iub resources are sufficient.

In scenarios where TTI switching or load reshuffling (LDR) frequently occurs due to basic congestion of uplink credit resources, CE Overbooking reduces the number of TTI switching or LDR events or increases the number of HSUPA UEs with a 2 ms TTI.

In scenarios where uplink credit resources are sufficient, CE Overbooking increases remaining credit resources.

Network Performance

CE Overbooking has the following impact on network performance:

In scenarios where a large number of admission rejections occur due to severe congestion of uplink credit resources, CE Overbooking allows more UEs to be admitted and increases the radio access success rate. (This is because CE Overbooking takes the uplink traffic volume into consideration when calculating the remaining credit resources, therefore increasing the availability of credit resources.) However, when more UEs transmit data simultaneously, the HSUPA call drop rate may increase due to congestion of CE and Uu resources.

In scenarios where TTI switching or LDR frequently occurs due to basic congestion of uplink credit resources, the number of HSUPA UEs with a 2 ms TTI increases because CE Overbooking increases the availability of credit resources. However, HSUPA UEs with a 2 ms TTI have poorer anti-interference capabilities than HSUPA UEs with a 10 ms TTI. Therefore, the call drop rate may increase in poor coverage because HSUPA UEs with a 2 ms TTI are more vulnerable to call drops than HSUPA UEs with a 10 ms TTI.

NOTE

After CE Overbooking is enabled, the amount of credit resources consumed by admitted UEs is related to the actual UE rate. If the amount of credit resources consumed by admitted UEs is large due to high actual UE rate, the handover success rate and the RRC connection setup success rate may decrease because the reserved resources may be consumed by admitted UEs. This problem has a low probability of occurrence and network performance is generally not affected.

After CE Overbooking is enabled, there is a possibility that admission rejections increase over the Iub interface if a large number of UEs has accessed the network. However, CE Overbooking does not affect the UE access success rate.

Before CE Overbooking is enabled, the RNC updates the consumption of CE resources for UE admission upon UE access or release.

After CE Overbooking is enabled, the NodeB updates the consumption of CE resources for UE admission and reports to the RNC every 1s. During the report interval, the RNC cannot learn about the accurate consumption of CE resources, resulting in information inconsistency between the RNC and the NodeB. Therefore, there is a possibility that some UEs are admitted by the RNC but fail to be admitted by the NodeB.

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CE Overbooking 8 Impact on the Network



8-2

8.2 Impact on Other Features

CE Overbooking depends on WRFD-010638 Dynamic CE Resource Management.

CE Overbooking allows an excessive number of UEs to be admitted and therefore cannot reserve sufficient credit resources to guarantee GBR for the admitted UEs. The amount of reserved credit resources is calculated as follows:

Amount of reserved credit resource = Max (Amount of credit resources required for ensuring the GBR, Amount of credit resources required for transmitting one RLC PDU)

For example, when there are many 2 ms HSUPA UEs and multiple 2 ms HSUPA UEs transmit data at the same time, call drops may occur. However, if TTI selection is applied with CE Overbooking, the TTI for HSUPA UEs can be switched from 2 ms to 10 ms in this situation to reduce the call drop rate. Therefore, it is recommended that CE Overbooking be used with Admission-CE-based Dynamic TTI Adjustment for a Single BE Service over HSUPA.

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CE Overbooking 9 Engineering Guidelines



9-1

9 Engineering Guidelines

9.1 When to Use CE Overbooking

To improve RNC's capability to perform admission control based on credit resource usage, CE Overbooking should be enabled in a network that meets all the following conditions:

A large number of smart phones, especially HSUPA UEs with a 2 ms TTI

Insufficient credit resources

Low HSUPA throughput for cells under the NodeB

9.2 Information to Be Collected

Before deploying CE Overbooking, collect the values of the following counters on the live network:

VS.HSUPA.UE.Mean.CATx (x 6): measures the number of HSUPA UEs that support the 2 ms TTI.

VS.LC.ULCreditUsed.Mean: measures the uplink credit resource usage.

VS.LCC.LDR.Num.ULCE: measures the number of LDR events triggered by uplink credit resource congestion.

VS.HSUPA.TTI2to10.ADMCE.Succ: measures the number of TTI switching events triggered by uplink credit resource congestion.

VS.HSUPA.RABEstabTTI10ms.AdmCE.Succ: measures the number of successful RAB establishments for TTI switching from 2 ms to 10 ms triggered by uplink credit resource congestion.

VS. RAB.FailEstabPS.ULCE.Cong and VS.RAB.FailEstabCS.ULCE.Cong: measure the number of admission rejections triggered by uplink credit resource congestion.

VS.HSUPA.MeanBitRate: measures the average cell throughput for HSUPA UEs in the cell.

9.3 Deployment

9.3.1 Deployment Requirements

Dependencies on Hardware

The 3900 series base station must be configured with the WBBPb, WBBPd, or WBBPf board.

The DBS3800 must be configured with the EBBC or EBBCd board.

The BTS3812E, BTS3812A, and BTS3812AE must be configured with the EBBI, EBOI, or EULPd board.

Dependencies on Other Features

Before enabling this feature, the feature WRFD-010638 Dynamic CE Resource Management must be enabled.

License

The license "CE overbooking(Per NodeB)" on the NodeB side has been activated. For details about the license items and how to activate the license, see License Management Feature Parameter Description.

9.3.2 Data Preparation

None

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9-2

9.3.3 Precautions

This feature should be used with Huawei professional services.

9.3.4 Initial Configuration

Perform the following steps to activate CE Overbooking:

Step 1 Run the following MML command SET NODEBRSVP to set the minimum number of CEs required for admitting an HSUPA UE with a 2 ms TTI on the NodeB LMT. In this step, set Reserved Parameter 4(REVDPARA4).

Step 2 (Optional) Run the RNC MML command SET UALGORSVPARA. In this step, set Reserved Switch 1 to RESERVED_SWITCH_1_BIT5.

NOTE

It is good practice to retain the default value of Reserved Parameter 4 (REVDPARA4).

It is good practice to set the parameter in step 2 so that the network can admit more users.

--END

9.3.5 Activation Check

Verify that the value of the new counter VS.NodeB.ULCreditUsed.Mean, VS.NodeB.ULCreditUsed.Max or VS.NodeB.ULCreditUsed.Min is not 0. A non-zero value indicates that CE Overbooking takes effect.

9.3.6 Feature Deactivation

Deactivate the license for CE Overbooking on the M2000.

9.3.7 Example

//Setting the minimum number of CEs required for admitting an HSUPA UE with a 2 ms TTI

SET NODEBRSVP: REVDPARA4=4;

9.4 Performance Optimization

Monitoring

Monitor the following items:

Credit resources consumed by admitted UEs

Check the counters in Table 9-1 to obtain the credit resource usages after CE Overbooking is activated.

Table 9-1 Credit resource usages after CE Overbooking is activated

Counter Description

VS.NodeB.ULCreditUsed.Mean Average NodeB Credit Usage When CE Overbooking Is Enabled

VS.NodeB.ULCreditUsed.Max Maximum NodeB Credit Usage When CE Overbooking Is Enabled

VS.NodeB.ULCreditUsed.Min Minimum NodeB Credit Usage When CE Overbooking Is Enabled

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9-3

The difference between VS.NodeB.ULCreditUsed.Mean and VS.LC.ULCreditUsed.Mean is as follows:

VS.NodeB.ULCreditUsed.Mean measures the usage of credit resources consumed by admitted UEs after CE Overbooking is activated.

VS.LC.ULCreditUsed.Mean measures the usage of credit resources consumed by admitted UEs. This counter is measured regardless of whether CE Overbooking is activated.

When CE Overbooking takes effect, the value of VS.NodeB.ULCreditUsed.Mean for a NodeB is smaller than the sum of VS.LC.ULCreditUsed.Mean for all cells under this NodeB.

CE-based access success rate

After CE Overbooking is activated on a network with a low average HSUPA throughput, the CE-based access success rate of the network increases.

Use the following formula to calculate the CE-based access success rate:

CE-based access success rate = 1 {(VS. RAB.FailEstabPS.ULCE.Cong + VS. RAB.FailEstabCS.ULCE.Cong)/Total number of RAB establishment attempts in the cell}

The total number of RAB establishment attempts in the cell is the sum of the values of the counters in Table 9-2.

Table 9-2 Counters measuring the number of RAB establishment attempts for each type of service in the cell

Counter Description

VS.RAB.AttEstabPS.Conv Number of PS Conversational RAB Establishment Attempts for Cell

VS.RAB.AttEstabPS.Bkg Number of PS Background RAB Establishment Attempts for Cell

VS.RAB.AttEstabPS.Int Number of PS Interactive RAB Establishment Attempts for Cell

VS.RAB.AttEstabPS.Str Number of PS Streaming RAB Establishment Attempts for Cell

VS.RAB.SuccEstabCS.Conv Number of CS Conversational RAB Establishment Requests for Cell

VS.RAB.SuccEstabCS.Str Number of CS Streaming RAB Establishment Requests for Cell

Local cell group credit utilization

Table 9-3 lists local cell group (LCG)-level credit utilization when CE Overbooking takes effect. The larger the counter value, the more severe the LCG-level credit congestion is.

Table 9-3 Related counters

Counter Description

VS.LCG.ULCreditUsage.Mean LCG-level uplink average credit utilization for a cell when CE Overbooking takes effect

VS.LCG.ULCreditUsage.Max LCG-level uplink maximum credit utilization for a cell when CE Overbooking takes effect

Number of HSUPA UEs with a 2 ms TTI

After activating CE Overbooking on a network with a low average HSUPA throughput, check the counter in Table 9-4 to determine whether the number of HSUPA UEs with a 2 ms TTI increases.

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9-4

Table 9-4 Counter measuring the average number of HSUPA UEs with a 2 ms TTI

Counter Description

VS.HSUPA.UE.Mean.TTI2ms Average number of 2 ms HUSPA users

LDR events caused by CE congestion

After activating CE Overbooking on a network with a low average HSUPA throughput, check the counter in Table 9-5 to determine whether the number of LDR events caused by CE congestion decreases.

Table 9-5 Counter measuring the number of LDR events caused by CE congestion

Counter Description

VS.LCC.LDR.Num.ULCE Number of Times a Cell Is in LDR State Due to UL CE Resource Congestion for Cell

Load on the Uu interface

After activating CE Overbooking on a network with a low average HSUPA throughput, check the counter in Table 9-6 to determine whether the load on the Uu interface increases.

Table 9-6 Counter measuring the mean received total wideband power in the cell

Counter Description

VS.MeanRTWP Mean Power of Totally Received Bandwidth for Cell

Average cell throughput

After activating CE Overbooking on a network with a low average HSUPA throughput and sufficient Uu and Iub resources, check the counter in Table 9-7 to determine whether the average cell throughput increases.

Table 9-7 Counter measuring the average cell throughput

Counter Description

VS.HSUPA.MeanBitRate Average Throughput of HSUPA Users for Cell

Parameter Optimization

If the call drop rate increases due to insufficient CE resources after this feature is enabled, it is recommended that REVDPARA4 be set to a larger value.

9.5 Troubleshooting

None.

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CE Overbooking 10 Parameters



10-1

10 Parameters

Table 10-1 Parameter description

Parameter ID NE MML Command

Feature ID

Feature Name

Description

BeHsupa2msTtiRateThs

BSC6900 SET UFRC WRFD-01061206

WRFD-01061403

Interactive and Background Traffic Class on HSUPA

HSUPA 2ms TTI

Meaning:This parameter specifies the rate threshold of 2ms TTI on the E-DCH for HSUPA BE service. When the cell capability and UE capability allows 2ms TTI, 2ms TTI on the E-DCH is used if the PS BE service carried on HSUPA with uplink rate isn't less than this threshold. Otherwise, 10ms TTI is used.

GUI Value Range:D8, D16, D32, D64, D128, D144, D256, D384, D608, D1280, D2048, D2720

Actual Value Range:8, 16, 32, 64, 128, 144, 256, 384, 608, 1280, 2048, 2720

Unit:kbit/s

Default Value:D1280

DraSwitch BSC6900 SET UCORRMALGOSWITCH

WRFD-01061111

WRFD-01061208

WRFD-01061404

WRFD-011502

WRFD-021101

WRFD-050405

WRFD-050408

WRFD-010690

WRFD-01061403

WRFD-010202

HSDPA State Transition

HSUPA DCCC

HSUPA 2ms/10ms TTI Handover

Active Queue Management (AQM)

Dynamic Channel Configuration Control (DCCC)

Overbooking on ATM Transmission

Overbooking on IP Transmission

TTI Switch

Meaning:Dynamic resource allocation switch group.

1. DRA_AQM_SWITCH: When the switch is on, the active queue management algorithm is used for the BSC6900.

2. DRA_BASE_ADM_CE_BE_TTI_L2_OPT_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm for admission CE-based BE services applies to the UE with the UL enhanced L2 feature. This parameter is valid when DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH(DraSwitch) is set to ON.

3. DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm is supported for admission CE-based BE services.

4. DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH: When the switch is on, the

WCDMA RAN




10-2


Feature ID

Feature Name

Description

for BE Services Based on Coverage

HSUPA 2ms TTI

UE State in Connected Mode (CELL-DCH, CELL-PCH, URA-PCH, CELL-FACH)

TTI dynamic adjustment algorithm for coverage-based BE services applies to the UE with the UL enhanced L2 feature. This parameter is valid when DRA_BASE_COVER_BE_TTI_RECFG_SWITCH(DraSwitch) is set to ON.

5. DRA_BASE_COVER_BE_TTI_RECFG_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm is supported for coverage-based BE services.

6. DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm for differentiation-based BE services applies to the UE with the UL enhanced L2 feature. This parameter is valid when DRA_BASE_RES_BE_TTI_RECFG_SWITCH(DraSwitch) is set to ON.

7. DRA_BASE_RES_BE_TTI_RECFG_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm is supported for differentiation-based BE services.

8. DRA_DCCC_SWITCH: When the switch is on, the dynamic channel reconfiguration control algorithm is used for the BSC6900.

9. DRA_HSDPA_DL_FLOW_CONTROL_SWITCH: When the switch is on, flow control is enabled for HSDPA services in AM mode.

10. DRA_HSDPA_STATE_TRANS_SWITCH: When the switch is on, the status of the UE RRC that carrying HSDPA services can be changed to CELL_FACH at the BSC6900. If a PS BE service is carried over the HS-DSCH, the switch PS_BE_STATE_TRANS_SWITCH should be on simultaneously. If a PS real-time service is carried over the

WCDMA RAN




10-3


Feature ID

Feature Name

Description

HS-DSCH, the switch PS_NON_BE_STATE_TRANS_SWITCH should be on simultaneously.

11. DRA_HSUPA_DCCC_SWITCH: When the switch is on, the DCCC algorithm is used for HSUPA. The DCCC switch must be also on before this switch takes effect.

12. DRA_HSUPA_STATE_TRANS_SWITCH: When the switch is on, the status of the UE RRC that carrying HSUPA services can be changed to CELL_FACH at the BSC6900. If a PS BE service is carried over the E-DCH, the switch PS_BE_STATE_TRANS_SWITCH should be on simultaneously. If a PS real-time service is carried over the E-DCH, the switch PS_NON_BE_STATE_TRANS_SWITCH should be on simultaneously.

13. DRA_IP_SERVICE_QOS_SWITCH: Switch of the algorithm for increasing the quality of subscribed services. When this parameter is set to ON, the service priority weight of the subscriber whose key parameters (IP Address, IP Port, and IP Protocol Type) match the specified ones can be adjusted. In this way, the QoS is improved.

14. DRA_PS_BE_STATE_TRANS_SWITCH: When the switch is on, UE RRC status transition (CELL_FACH/CELL_PCH/URA_PCH) is allowed at the BSC6900.

15. DRA_PS_NON_BE_STATE_TRANS_SWITCH: When the switch is on, the status of the UE RRC that carrying real-time services can be changed to CELL_FACH at the BSC6900.

16. DRA_R99_DL_FLOW_CONTROL_SWITCH: Under a poor radio environment, the QoS of high speed services drops

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10-4


Feature ID

Feature Name

Description

considerably and the TX power is overly high. In this case, the BSC6900 can set restrictions on low data rate transmission formats based on the transmission quality, thus lowering traffic speed and TX power. When the switch is on, the R99 downlink flow control function is enabled.

17. DRA_THROUGHPUT_DCCC_SWITCH: When the switch is on, the DCCC based on traffic statistics is supported over the DCH.

18. DRA_VOICE_SAVE_CE_SWITCH: when the switch is on, the TTI selection based on the voice service type (including VoIP and CS over HSPA) is supported when the service is initially established.

19. DRA_VOICE_TTI_RECFG_SWITCH: when the switch is on, the TTI adjustment based on the voice service type (including VoIP and CS over HSPA) is supported.

20. DRA_CSPS_NO_PERIOD_RETRY_SWITCH: Whether to prohibit channel retries for CS and PS combined services. When this switch is turned on, channel retries are prohibited for CS and PS combined services. When this switch is turned off, channel retries are allowed for CS and PS combined services.

21. DRA_SMART_FAST_STATE_TRANS_SWITCH: Whether to activate the fast state transition algorithm. When this switch is turned on, the BSC6900 identifies UEs supporting fast state transition and then quickly transits the UEs from CELL_DCH to CELL_FACH.

22. DRA_PCH_UE_SMART_P2D_SWITCH: Whether to activate the algorithm for smart PCH-to-DCH state transition specific to UEs in the CELL_PCH or

WCDMA RAN




10-5


Feature ID

Feature Name

Description

URA_PCH state. When this switch is turned on, the BSC6900 identifies UEs supporting smart PCH-to-DCH state transition and then transits the UEs from CELL_PCH or URA_PCH to CELL_DCH.

23. DRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH: Whether initial TTI selection is allowed for differentiated BE services based on fairness

0: This switch is turned off. The TTI is selected according to the original algorithm.

1: This switch is turned on. In the dynamic TTI adjustment algorithm for differentiated BE services based on fairness, HSUPA UEs use 10-ms TTI if the RTWP, occupied Iub bandwidth, or consumed CE resources are congested.

24. DRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH: Whether to activate the coverage-based initial TTI selection algorithm specific to BE services. When this switch is turned on and conditions on 2 ms TTI specific to BE services has been met, the BSC6900 determines uplink coverage wideness of specific cells based on the Ec/N0 values reported by UEs during RRC connection. If the uplink coverage of the cells is weak, the BSC6900 allocates a 10 ms TTI to BE services as their initial TTI.

25. DRA_F2U_SWITCH: Whether to enable state transition from CELL_FACH to URA_PCH.When this switch is turned on, a UE can directly move from the CELL_FACH to URA_PCH state. When this switch is turned off, a UE must move from the CELL_FACH to CELL_PCH and then to URA_PCH state.

GUI Value Range:DRA_AQM_SWITCH, DRA_BASE_ADM_CE_BE_TTI_L2_O

WCDMA RAN




10-6


Feature ID

Feature Name

Description

PT_SWITCH, DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH, DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH, DRA_BASE_COVER_BE_TTI_RECFG_SWITCH, DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH, DRA_BASE_RES_BE_TTI_RECFG_SWITCH, DRA_DCCC_SWITCH, DRA_HSDPA_DL_FLOW_CONTROL_SWITCH, DRA_HSDPA_STATE_TRANS_SWITCH, DRA_HSUPA_DCCC_SWITCH, DRA_HSUPA_STATE_TRANS_SWITCH, DRA_IP_SERVICE_QOS_SWITCH, DRA_PS_BE_STATE_TRANS_SWITCH, DRA_PS_NON_BE_STATE_TRANS_SWITCH, DRA_R99_DL_FLOW_CONTROL_SWITCH, DRA_THROUGHPUT_DCCC_SWITCH, DRA_VOICE_SAVE_CE_SWITCH, DRA_VOICE_TTI_RECFG_SWITCH, DRA_CSPS_NO_PERIOD_RETRY_SWITCH, DRA_SMART_FAST_STATE_TRANS_SWITCH, DRA_PCH_UE_SMART_P2D_SWITCH, DRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH, DRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH, DRA_F2U_SWITCH

Actual Value Range:DRA_AQM_SWITCH, DRA_BASE_ADM_CE_BE_TTI_L2_OPT_SWITCH, DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH, DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH, DRA_BASE_COVER_BE_TTI_RECFG_SWITCH, DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH, DRA_BASE_RES_BE_TTI_RECFG_SWITCH, DRA_DCCC_SWITCH, DRA_HSDPA_DL_FLOW_CONTROL_SWITCH,

WCDMA RAN




10-7


Feature ID

Feature Name

Description

DRA_HSDPA_STATE_TRANS_SWITCH, DRA_HSUPA_DCCC_SWITCH, DRA_HSUPA_STATE_TRANS_SWITCH, DRA_IP_SERVICE_QOS_SWITCH, DRA_PS_BE_STATE_TRANS_SWITCH, DRA_PS_NON_BE_STATE_TRANS_SWITCH, DRA_R99_DL_FLOW_CONTROL_SWITCH, DRA_THROUGHPUT_DCCC_SWITCH, DRA_VOICE_SAVE_CE_SWITCH, DRA_VOICE_TTI_RECFG_SWITCH, DRA_CSPS_NO_PERIOD_RETRY_SWITCH, DRA_SMART_FAST_STATE_TRANS_SWITCH, DRA_PCH_UE_SMART_P2D_SWITCH, DRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH, DRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH, DRA_F2U_SWITCH

Unit:None

Default Value:DRA_AQM_SWITCH-0&DRA_BASE_ADM_CE_BE_TTI_L2_OPT_SWITCH-0&DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH-1&DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH-0&DRA_BASE_COVER_BE_TTI_RECFG_SWITCH-0&DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH-0&DRA_BASE_RES_BE_TTI_RECFG_SWITCH-1&DRA_DCCC_SWITCH-1&DRA_HSDPA_DL_FLOW_CONTROL_SWITCH-0&DRA_HSDPA_STATE_TRANS_SWITCH-0&DRA_HSUPA_DCCC_SWITCH-1&DRA_HSUPA_STATE_TRANS_SWITCH-0&DRA_IP_SERVICE_QOS_SWITCH-0&DRA_PS_BE_STATE_TRANS_SWITCH-1&DRA_PS_NON_BE_STATE_TRANS_SWITCH-0&DRA_R99_DL_FLOW_CONTROL_SWITCH-0&DRA_THROUGHPUT_DCCC_SWITCH-0&DRA_VOICE_SAVE_CE_SWITCH-0&DRA_VOICE_TTI_RECFG_SWITCH-0&DRA_CSPS_NO_PERIOD_RETRY_SWITCH-0&DRA_SMART_FAST_STATE_TRANS_SWITCH-0&DRA_PCH_UE_SMART_P2D_SWITCH-0&DRA_BAS

WCDMA RAN




10-8


Feature ID

Feature Name

Description

E_RES_BE_TTI_INIT_SEL_SWITCH-0&DRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH-0&DRA_F2U_SWITCH-0

MapSwitch BSC6900 SET UCORRMALGOSWITCH

WRFD-01061403

WRFD-010630

WRFD-010632

WRFD-010688

WRFD-01061403

HSUPA 2ms TTI

Streaming Traffic Class on HSDPA

Streaming Traffic Class on HSUPA

Downlink Enhanced CELL_FACH

HSUPA 2ms TTI

Meaning:Service mapping strategy switch group.

1) MAP_HSUPA_TTI_2MS_SWITCH: When the switch is on, 2 ms TTI is supported for HSUPA.

2) MAP_INTER_RAT_PS_IN_CHANLE_LIMIT_SWITCH: When the switch is on, the PS services are transmitted on the DCH during the 2G-to-3G handover. When the switch is not on, the PS services can be transmitted on suitable channels according to the algorithm parameter configured for the RNC during the 2G-to-3G handover.

3) MAP_PS_BE_ON_E_FACH_SWITCH: When the switch is on, the PS BE services can be transmitted on the E-FACH(E-FACH for downlink and RACH for uplink, or E-FACH for downlink and E-RACH for uplink).

4) MAP_PS_STREAM_ON_E_FACH_SWITCH: When the switch is on, the PS streaming services can be transmitted on the E-FACH(E-FACH for downlink and RACH for uplink, or E-FACH for downlink and E-RACH for uplink).

5) MAP_PS_STREAM_ON_HSDPA_SWITCH: When the switch is on, a PS streaming service is mapped on the HS-DSCH if the DL maximum rate of the service is greater than or equal to the HSDPA threshold for streaming services.

6) MAP_PS_STREAM_ON_HSUPA_SWITCH: When the switch is on, a PS streaming service is mapped on the E-DCH if the UL maximum rate of the service is greater than or equal to the

WCDMA RAN




10-9


Feature ID

Feature Name

Description

HSUPA threshold for streaming services.

7) MAP_SRB_6800_WHEN_RAB_ON_HSDSCH_SWITCH: When the switch is on, the signaling is transmitted at a rate of 6.8 kbit/s if all the downlink traffic is on the HSDPA channel.

8) MAP_SRB_ON_DCH_OR_FACH_CS_RRC_SWITCH: When this switch is turned on, the SRB of a CS RRC connection cannot be established on HSPA channels. The RNC determines whether an RRC connection request is for a CS service based on the RRC connection setup cause and the value of Domain Indicator. For a UE of a version earlier than Release 6, the RRC connection setup cause of CS services is Originating Conversational Call or Terminating Conversational Call. For a UE of Release 6 or a later version, the value of Domain Indicator must be CS and the RRC connection setup cause must be Originating Conversational Call or Terminating Conversational Call for a CS service.

9) MAP_CSPS_TTI_2MS_LIMIT_SWITCH: Whether CS and PS combined services can use HSUPA 2ms transmission time interval (TTI). When this switch is turned on, CS and PS combined services cannot use HSUPA 2ms TTI, which reduces CS call drops caused by TTI switching. When this switch is turned off, CS and PS combined services can use HSUPA 2ms TTI.

GUI Value Range:MAP_HSUPA_TTI_2MS_SWITCH, MAP_INTER_RAT_PS_IN_CHANLE_LIMIT_SWITCH, MAP_PS_BE_ON_E_FACH_SWITCH, MAP_PS_STREAM_ON_E_FACH_SWITCH, MAP_PS_STREAM_ON_HSDPA_SWITCH,

WCDMA RAN




10-10


Feature ID

Feature Name

Description

MAP_PS_STREAM_ON_HSUPA_SWITCH, MAP_SRB_6800_WHEN_RAB_ON_HSDSCH_SWITCH, MAP_SRB_ON_DCH_OR_FACH_CS_RRC_SWITCH, MAP_CSPS_TTI_2MS_LIMIT_SWITCH

Actual Value Range:MAP_HSUPA_TTI_2MS_SWITCH, MAP_INTER_RAT_PS_IN_CHANLE_LIMIT_SWITCH, MAP_PS_BE_ON_E_FACH_SWITCH, MAP_PS_STREAM_ON_E_FACH_SWITCH, MAP_PS_STREAM_ON_HSDPA_SWITCH, MAP_PS_STREAM_ON_HSUPA_SWITCH, MAP_SRB_6800_WHEN_RAB_ON_HSDSCH_SWITCH, MAP_SRB_ON_DCH_OR_FACH_CS_RRC_SWITCH, MAP_CSPS_TTI_2MS_LIMIT_SWITCH

Unit:None

Default Value:MAP_HSUPA_TTI_2MS_SWITCH-0&MAP_INTER_RAT_PS_IN_CHANLE_LIMIT_SWITCH-0&MAP_PS_BE_ON_E_FACH_SWITCH-0&MAP_PS_STREAM_ON_E_FACH_SWITCH-0&MAP_PS_STREAM_ON_HSDPA_SWITCH-0&MAP_PS_STREAM_ON_HSUPA_SWITCH-0&MAP_SRB_6800_WHEN_RAB_ON_HSDSCH_SWITCH-0&MAP_SRB_ON_DCH_OR_FACH_CS_RRC_SWITCH-0&MAP_CSPS_TTI_2MS_LIMIT_SWITCH-0

ResourceOption

BSC6900 SET UEDCHTTIRECFG

None None Meaning:Resource type that triggers TTI adjustment based on user fairness and differentiated services.

This parameter is an advanced parameter. To modify this parameter, contact Huawei Customer Service Center for technical support.

WCDMA RAN




10-11


Feature ID

Feature Name

Description

GUI Value Range:RTWP, IUB, CE

Actual Value Range:RTWP, Iub, CE

Unit:None

Default Value:RTWP-1&IUB-0&CE-0

REVDPARA4 NodeB SET NODEBRSVP

None None Meaning:Indicates the NodeB reserved parameter 4.

GUI Value Range:0~4294967295

Actual Value Range:0~4294967295

Unit:None

Default Value:0

RsvSwitch1 BSC6900 SET UALGORSVPARA

None None Meaning:1. RRM algorithm reserved U32 Switch Para 1. The para of 32 bits is reserved for further change request use.

2. RESERVED_SWITCH_1_BIT3: Whether to allow the RNC to limit the maximum data rate for HSDPA PS services after a CS service setup triggers an F2D state transition. When the switch is set to ON, the maximum data rate for HSDPA PS services is unlimited after a CS service setup triggers an F2D state transition. When the switch is set to OFF, the maximum data rate for HSDPA PS services is limited after a CS service setup triggers an F2D state transition.

3. RESERVED_SWITCH_1_BIT4: Whether to allow the RNC to optimize the algorithm of TTI dynamic switching for differentiated BE services based on fairness. When the switch is set to ON, the RNC does not update the throughput measurement control parameter for this algorithm if the parameter does not change after a handover is complete. In this case, the RNC triggers this algorithm upon receiving a TTI measurement report. When the switch is set to OFF, the RNC updates the throughput measurement control parameter for this algorithm after the handover is complete and prohibits this algorithm from triggering

WCDMA RAN




10-12


Feature ID

Feature Name

Description

dynamic TTI shifts from 2 ms to 10 ms in the following 5s.

Disuse statement: This parameter is used temporarily in patch versions and will be replaced with a new parameter in later versions. The new parameter ID reflects the parameter function. Therefore, this parameter is not recommended for the configuration interface.

GUI Value Range:RESERVED_SWITCH_1_BIT1, RESERVED_SWITCH_1_BIT2, RESERVED_SWITCH_1_BIT3, RESERVED_SWITCH_1_BIT4, RESERVED_SWITCH_1_BIT5, RESERVED_SWITCH_1_BIT6, RESERVED_SWITCH_1_BIT7, RESERVED_SWITCH_1_BIT8, RESERVED_SWITCH_1_BIT9, RESERVED_SWITCH_1_BIT10, RESERVED_SWITCH_1_BIT11, RESERVED_SWITCH_1_BIT12, RESERVED_SWITCH_1_BIT13, RESERVED_SWITCH_1_BIT14, RESERVED_SWITCH_1_BIT15, RESERVED_SWITCH_1_BIT16, RESERVED_SWITCH_1_BIT17, RESERVED_SWITCH_1_BIT18, RESERVED_SWITCH_1_BIT19, RESERVED_SWITCH_1_BIT20, RESERVED_SWITCH_1_BIT21, RESERVED_SWITCH_1_BIT22, RESERVED_SWITCH_1_BIT23, RESERVED_SWITCH_1_BIT24, RESERVED_SWITCH_1_BIT25, RESERVED_SWITCH_1_BIT26, RESERVED_SWITCH_1_BIT27, RESERVED_SWITCH_1_BIT28, RESERVED_SWITCH_1_BIT29, RESERVED_SWITCH_1_BIT30, RESERVED_SWITCH_1_BIT31, RESERVED_SWITCH_1_BIT32

Actual Value Range:RESERVED_SWITCH_1_BIT1, RESERVED_SWITCH_1_BIT2, RESERVED_SWITCH_1_BIT3, RESERVED_SWITCH_1_BIT4, RESERVED_SWITCH_1_BIT5, RESERVED_SWITCH_1_BIT6,

WCDMA RAN




10-13


Feature ID

Feature Name

Description

RESERVED_SWITCH_1_BIT7, RESERVED_SWITCH_1_BIT8, RESERVED_SWITCH_1_BIT9, RESERVED_SWITCH_1_BIT10, RESERVED_SWITCH_1_BIT11, RESERVED_SWITCH_1_BIT12, RESERVED_SWITCH_1_BIT13, RESERVED_SWITCH_1_BIT14, RESERVED_SWITCH_1_BIT15, RESERVED_SWITCH_1_BIT16,

RESERVED_SWITCH_1_BIT17, RESERVED_SWITCH_1_BIT18, RESERVED_SWITCH_1_BIT19, RESERVED_SWITCH_1_BIT20, RESERVED_SWITCH_1_BIT21, RESERVED_SWITCH_1_BIT22, RESERVED_SWITCH_1_BIT23, RESERVED_SWITCH_1_BIT24, RESERVED_SWITCH_1_BIT25, RESERVED_SWITCH_1_BIT26, RESERVED_SWITCH_1_BIT27, RESERVED_SWITCH_1_BIT28, RESERVED_SWITCH_1_BIT29, RESERVED_SWITCH_1_BIT30,

RESERVED_SWITCH_1_BIT31, RESERVED_SWITCH_1_BIT32

Unit:None

Default Value:RESERVED_SWITCH_1_BIT1-0&RESERVED_SWITCH_1_BIT2-0&RESERVED_SWITCH_1_BIT3-0&RESERVED_SWITCH_1_BIT4-0&RESERVED_SWITCH_1_BIT5-0&RESERVED_SWITCH_1_BIT6-0&RESERVED_SWITCH_1_BIT7-0&RESERVED_SWITCH_1_BIT8-0&RESERVED_SWITCH_1_BIT9-0&RESERVED_SWITCH_1_BIT10-0&RESERVED_SWITCH_1_BIT11-0&RESERVED_SWITCH_1_BIT12-0&RESERVED_SWITCH_1_BIT13-0&RESERVED_SWITCH_1_BIT14-0&RESERVED_SWITCH_1_BIT15-0&RESERVED_SWITCH_1_BIT16-0&RESERVED_SWITCH_1_BIT17-0&RESERVED_SWITCH_1_BIT18-0&RESERVED_SWITCH_1_BIT19-0&RESERVED_SWITCH_1_BIT20-0&RESERVED_SWITCH_1_BIT21-0&RESERVED_SWITCH_1_BIT22-0&RESERVED_SWITCH_1_BIT23-0&RESERVED_SWITCH_1_BIT24-0&RE

WCDMA RAN




10-14


Feature ID

Feature Name

Description

SERVED_SWITCH_1_BIT25-0&RESERVED_SWITCH_1_BIT26-0&RESERVED_SWITCH_1_BIT27-0&RESERVED_SWITCH_1_BIT28-0&RESERVED_SWITCH_1_BIT29-0&RESERVED_SWITCH_1_BIT30-0&RESERVED_SWITCH_1_BIT31-0&RESERVED_SWITCH_1_BIT32-0

TenMsecForUlBasicMeas

BSC6900 SET ULDM WRFD-020102

Load Measurement

Meaning:UL basic common measurement report cycle. For detailed information of this parameter, refer to 3GPP TS 25.433.



Unit:10ms

Default Value:100

UlHoCeResvSf BSC6900 ADD UCELLCAC

MOD UCELLCAC

WRFD-020101

Admission Control

Meaning:Uplink Credit Reserved by Spread Factor for HandOver. SFOFF means that none of them are reserved for handover.

GUI Value Range:SF4(SF4), SF8(SF8), SF16(SF16), SF32(SF32), SF64(SF64), SF128(SF128), SF256(SF256), SFOFF(SFOFF)

Actual Value Range:SF4, SF8, SF16, SF32, SF64, SF128, SF256, SFOFF

Unit:None

Default Value:SF16(SF16)

UlLdrCreditSfResThd

BSC6900 ADD UNODEBLDR

MOD UNODEBLDR

WRFD-020106

Load Reshuffling

Meaning:Threshold of SF reserved in uplink credit LDR. The uplink credit LDR is triggered when the SF factor corresponding to the uplink reserved credit is higher than the uplink or downlink credit SF reserved threshold. The lower the parameter value is, the easier the credit enters the congestion status, the easier the LDR action is triggered, and the easier the user experience is affected. A lower code resource LDR trigger threshold, however, causes a higher admission success rate because the resource is reserved. The parameter should be set

WCDMA RAN




10-15


Feature ID

Feature Name

Description

based on the operator's requirement.

GUI Value Range:SF4(SF4), SF8(SF8), SF16(SF16), SF32(SF32), SF64(SF64), SF128(SF128), SF256(SF256), 2*SF4(2*SF4), 2*SF2(2*SF2)

Actual Value Range:SF4, SF8, SF16, SF32, SF64, SF128, SF256, 2*SF4, 2*SF2

Unit:None


UlTtiCreditSfResThd

BSC6900 ADD UNODEBLDR

MOD UNODEBLDR

WRFD-020106

Load Reshuffling

Meaning:The threshold of the reserved SF is used for judging the uplink credit state for TTI switchover decision. When uplink credit is lower than the threshold, the credit state of TTI switchover algorithm is set to restricted. The smaller the parameter value is, the easier the credit state is set to restricted. The threshold of the reserved SF is converted to credit by DCH consumption law.

GUI Value Range:8SF4(8SF4), 7SF4(7SF4), 6SF4(6SF4), 5SF4(5SF4), 4SF4(4SF4), 3SF4(3SF4), 2SF4(2SF4), SF4(SF4), SF8(SF8), SF16(SF16), SF32(SF32), SF64(SF64), SF128(SF128), SF256(SF256)

Actual Value Range:8SF4, 7SF4, 6SF4, 5SF4, 4SF4, 3SF4, 2SF4, SF4, SF8, SF16, SF32, SF64, SF128, SF256

Unit:None


UpRatioFor2msTo10msBaseCE

BSC6900 SET UEDCHTTIRECFG

None None Meaning:Ratio for upper MAC-e/i rate threshold of CE-based TTI switchover from 2 ms to 10 ms. When adaptive retransmission (controlled by "PC_HSUPA_HARQNUM_AUTO_ADJUST_SWITCH") is disabled, or when adaptive retransmission is used together with small data retransmission, Upper MAC-e/i rate threshold of TTI switchover from 2 ms to 10 ms =

WCDMA RAN




10-16


Feature ID

Feature Name

Description

"BeHsupa2msTtiRateThs"/(1 + "EdchTargetLittleRetransNum") x this parameter value; When adaptive retransmission is enabled and large data retransmission is used, Upper MAC-e/i rate threshold of TTI switchover from 2 ms to 10 ms = "BeHsupa2msTtiRateThs"/(1 + "EdchTargetLargeRetransNum") x this parameter value. "Upper MAC-e/i rate threshold of CE-based TTI switchover from 2 ms to 10 ms" is applied to the scenarios where the TTI switchover from 2 ms to 10 ms is triggered by used CEs or admission CEs:

1. When the actual CE resources are limited and the throughput of an HSUPA user with 2 ms TTI is within the range {Lower MAC-e/i rate threshold of TTI switchover from 2 ms to 10 ms, Upper MAC-e/i rate threshold of CE-based TTI switchover from 2 ms to 10 ms}, the HSUPA user switches from 2 ms TTI to 10 ms TTI to reduce the consumption of CE resources.

2. When the admission CE resources are limited and the throughput of an HSUPA user with 2 ms TTI is lower than the "Upper MAC-e/i rate threshold of used CE-based TTI switchover from 2 ms to 10 ms", the HSUPA user switches from 2 ms TTI to 10 ms TTI to reduce the consumption of admission CE resources.



Unit:%

Default Value:56

WCDMA RAN

CE Overbooking 11 Counters



11-1

11 Counters

Table 11-1 Counter description

Counter ID Counter Name Counter Description NE Feature ID Feature Name

73424007 VS.NodeB.ULCreditUsed.Max

Maximum NodeB Uplink Credit Usage When CE Overbooking Is Enabled for NodeB

BSC6900

WRFD-140212

CE Overbooking

73424008 VS.NodeB.ULCreditUsed.Min

Minimum NodeB Uplink Credit Usage When CE Overbooking Is Enabled for NodeB

BSC6900

WRFD-140212

CE Overbooking

73441218 VS.NodeB.ULCreditUsed.Mean

Average NodeB Uplink Credit Usage When CE Overbooking Is Enabled for NodeB

BSC6900

WRFD-140212

CE Overbooking

WCDMA RAN

CE Overbooking 12 Glossary



12-1

12 Glossary

For the acronyms, abbreviations, terms, and definitions, see the Glossary.

WCDMA RAN

CE Overbooking 13 Reference Documents



13-1

13 Reference Documents

None

1 Introduction1.1 Scope1.2 Intended Audience1.3 Change HistoryDocument Issues03 (2012-11-30)02 (2012-07-20)01 (2012-04-30)Draft A (2012-02-15)

2 OverviewFigure 2-1 CE Overbooking

3 Technical PrinciplesTable 3-1 Credit resource calculation methods before and after activating this feature

4 CAC Based on NodeB Credit Resources5 Basic Congestion Related to NodeB Credit Resources6 TTI Selection During PS BE Service Setup or Reconfiguration7 Admission-CE-based Dynamic TTI Adjustment for a Single BE Service over HSUPA8 Impact on the Network8.1 Capacity and PerformanceSystem CapacityNetwork Performance

8.2 Impact on Other Features

9 Engineering Guidelines9.1 When to Use CE Overbooking9.2 Information to Be Collected9.3 Deployment9.3.1 Deployment Requirements9.3.2 Data Preparation9.3.3 Precautions9.3.4 Initial ConfigurationStep 1 Run the following MML command SET NODEBRSVP to set the minimum number of CEs required for admitting an HSUPA UE with a 2 ms TTI on the NodeB LMT. In this step, set Reserved Parameter 4(REVDPARA4).Step 2 (Optional) Run the RNC MML command SET UALGORSVPARA. In this step, set Reserved Switch 1 to RESERVED_SWITCH_1_BIT5.

9.3.5 Activation Check9.3.6 Feature Deactivation9.3.7 Example

9.4 Performance OptimizationMonitoringTable 9-1 Credit resource usages after CE Overbooking is activatedTable 9-2 Counters measuring the number of RAB establishment attempts for each type of service in the cellTable 9-3 Related countersTable 9-4 Counter measuring the average number of HSUPA UEs with a 2 ms TTITable 9-5 Counter measuring the number of LDR events caused by CE congestionTable 9-6 Counter measuring the mean received total wideband power in the cellTable 9-7 Counter measuring the average cell throughput

Parameter Optimization

9.5 Troubleshooting

10 ParametersTable 10-1 Parameter description

11 CountersTable 11-1 Counter description

12 Glossary13 Reference Documents