Fast L1 Synchronization(RAN15.0_Draft a)

Fast L1 Synchronization RAN15.0

Feature Parameter Description

Issue Draft A

Date 2013-01-30

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2013. All rights reserved.

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WCDMA RAN

Fast L1 Synchronization Contents

Draft A (2013-01-30) Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd.

i

Contents

1 About This Document .............................................................................................................. 1-1

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

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

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

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

2.1 Definition ....................................................................................................................................... 2-1

2.2 Gains ............................................................................................................................................. 2-1

3 Technical Description .............................................................................................................. 3-1

4 Related Features ....................................................................................................................... 4-1

4.1 Required Features......................................................................................................................... 4-1

4.2 Mutually Exclusive Features ......................................................................................................... 4-1

4.3 Affected Features .......................................................................................................................... 4-1

5 Network Impact .......................................................................................................................... 5-1

5.1 System Capacity ........................................................................................................................... 5-1

5.2 Network Performance ................................................................................................................... 5-1

6 Engineering Guidelines ........................................................................................................... 6-1

6.1 When to Use Fast L1 Synchronization .......................................................................................... 6-1

6.2 Required Information ..................................................................................................................... 6-1

6.3 Planning ........................................................................................................................................ 6-1

6.4 Deployment ................................................................................................................................... 6-1

6.4.1 Activation .............................................................................................................................. 6-1

6.4.2 Activation Observation .......................................................................................................... 6-1

6.4.3 Deactivation .......................................................................................................................... 6-1

6.4.4 MML Command Examples ................................................................................................... 6-1

6.5 Performance Monitoring ................................................................................................................ 6-1

7 Parameters.................................................................................................................................. 7-1

8 Counters ...................................................................................................................................... 8-1

9 Glossary ...................................................................................................................................... 9-1

10 Reference Documents ......................................................................................................... 10-1

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Fast L1 Synchronization About This Document



1-1

1 About This Document

1.1 Scope

This document describes the Fast L1 Synchronization feature for non-Push to Talk (PTT) services, including the working principles, related features, network impacts, and engineering guidelines.

For details on the Fast L1 Synchronization feature for PTT services, see the description of fast L1 synchronization in Push To Talk Feature Parameter Description.

1.2 Intended Audience

This document is intended for personnel who:

Need to understand Fast L1 Synchronization

Work with Huawei UMTS products

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 Fast L1 Synchronization 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 Versions

The document version is Draft A (2013-01-30).

Draft A (2013-01-30)

This is the draft of the document for RAN15.0.

Compared with issue 01 (2012-07-20) for RAN14.0, Draft A (2013-01-30) for RAN15.0 includes the following changes.

Change Type Change Description Parameter Change

Feature change None None

Editorial change Added the restrictions on this feature only for non-PTT services. For details, see section 1.1 "Scope."

None

Optimized the descriptions in chapter 3 "Technical Description."

None

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Fast L1 Synchronization Overview



2-1

2 Overview

2.1 Definition

During processes such as initial access, service setup, state transition, and hard handover, synchronization establishment between the UE and the universal terrestrial radio access network (UTRAN) must be completed before data transmission. In the common synchronization establishment procedure, the UE and the UTRAN first implement downlink synchronization and then uplink synchronization. Fast L1 Synchronization enables simultaneous downlink and uplink synchronization.

This feature was introduced in Release 6 of 3GPP TS 25.214.

2.2 Gains

This feature shortens the synchronization establishment duration by up to 40 ms. The gains from this feature vary with the implementation mechanism of specific UEs.

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Fast L1 Synchronization Technical Description



3-1

3 Technical Description

If the RNC parameter PROCESSSWITCH is set to NONPTT_L1_FAST_SYNC_SWITCH-1, the UTRAN sends the "Post-verification period" information element (IE) to a Release 6 or later UE during initial access, service setup, state transition, or hard handover. The IE instructs the UE to use fast L1 synchronization.

The "Post-verification period" IE is contained in the "Downlink information common for all radio links" IE, which is carried by the Uu interface messages Cell Update Confirm, RRC Connection Setup, Radio Bearer Setup, and Physical Channel Reconfiguration. For details about the IE structure, see 3GPP TS 25.331.

UEs that support fast L1 synchronization learn whether to adopt fast L1 synchronization by identifying the "Post-verification period" IE. As shown in Figure 3-1, uplink and downlink sychronization take place simultaneously once the UE receives the "Post-verification period" IE. The procedure is as follows:

1. The UTRAN starts data transmission on the downlink dedicated physical channel (DPCH) or fractional DPCH (F-DPCH).

2. Simultaneously, the UE starts data transmission on the uplink dedicated physical control channel (DPCCH).

3. The UTRAN establishes uplink synchronization with the UE once detecting data transmitted on the uplink DPCCH.

A common synchronization establishment procedure is implemented in either of the following scenarios:

The UE does not receive the "Post-verification period" IE.

The UE does not support fast L1 synchronization.

In this situation, the UE and the UTRAN first implement downlink synchronization, and then the UE starts data transmission on the uplink DPCCH to start uplink synchronization with the UTRAN.

Figure 3-1 Fast L1 synchronization

Before this feature was introduced, downlink and uplink synchronization were implemented in sequence, each occupying a time period of N312 x 40 ms. The value of N312 is set by running the SET UCONNMODETIMER command.

When this feature is used, the UE starts data transmission on the uplink DPCCH and the UTRAN establishes uplink synchronization with the UE during downlink synchronization. In this way, uplink

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Fast L1 Synchronization Technical Description



3-2

synchronization and downlink synchronization take place simultaneously. This shortens the synchronization establishment duration.

For details on how the UE and UTRAN interact with each other during fast L1 synchronization, see section 4.3.2 "Radio link establishment and physical layer reconfiguration for dedicated channels" in 3GPP TS 25.214.

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Fast L1 Synchronization Related Features



4-1

4 Related Features

4.1 Required Features

None

4.2 Mutually Exclusive Features

None

4.3 Affected Features

None

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Fast L1 Synchronization Network Impact



5-1

5 Network Impact

5.1 System Capacity

None

5.2 Network Performance

Theoretically, this feature reduces the RRC connection setup success rate, RAB assignment success rate, and handover success rate. The causes are as follows: When the UE sends the control information on the uplink DPCCH, the downlink radio link quality becomes unstable. This increases transmit power control (TPC) bit errors, causing the uplink received total wideband power (RTWP) to rise or making uplink synchronization difficult.

However, Huawei lab test results show that the RRC connection setup success rate, RAB assignment success rate, and handover success rate are not reduced after this feature is enabled. In the multi-user HSPA service test, this feature does not have a significant impact on the RTWP.

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Fast L1 Synchronization Engineering Guidelines



6-1

6 Engineering Guidelines

6.1 When to Use Fast L1 Synchronization

This feature is recommended when the service setup delay and handover delay need to be reduced and UEs that support Release 6 or later versions are in the network.

6.2 Required Information

The proportion of UEs in the network that support Release 6 or later versions.

6.3 Planning

None

6.4 Deployment

6.4.1 Activation

To activate the Fast L1 Synchronization feature, run the SET URRCTRLSWITCH command on the RNC to turn on the feature switch.

6.4.2 Activation Observation

To check whether the Fast L1 Synchronization feature has been activated, perform the following steps:

Step 1 Obtain a UMTS UE of Release 6 or later versions. Obtain the IMSI of the UE and start UE signaling tracing on the RNC.

Step 2 Use the UE to set up a CS call in a UMTS cell enabled with this feature.

Step 3 View the UE signaling tracing messages.

Verify that the "Downlink information common for all radio links" IE in the RRC Connection Setup message contains the "Post-verification period" IE. If the value of the "Post-verification period" IE is TRUE, this feature has been activated.

----End

6.4.3 Deactivation

To deactivate the Fast L1 Synchronization feature, run the SET URRCTRLSWITCH command on the RNC to turn off the feature switch.

6.4.4 MML Command Examples

//Activating the Fast L1 Synchronization feature

SET URRCTRLSWITCH: PROCESSSWITCH=NONPTT_L1_FAST_SYNC_SWITCH-1;

//Deactivating the Fast L1 Synchronization feature

SET URRCTRLSWITCH: PROCESSSWITCH=NONPTT_L1_FAST_SYNC_SWITCH-0;

6.5 Performance Monitoring

None

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Fast L1 Synchronization Parameters



7-1

7 Parameters

Table 7-1 Parameter description

Parameter ID

NE MML Command

Feature ID Feature Name Description

N312 BSC6900/BSC6910

SET UCONNMODETIMER

WRFD-010101 3GPP R9 Specifications

Meaning:Maximum number of successive "in sync" indications received from L1.

GUI Value Range:D1, D2, D4, D10, D20, D50, D100, D200, D400, D600, D800, D1000

Actual Value Range:1, 2, 4, 10, 20, 50, 100, 200, 400, 600, 800, 1000

Unit:None

Default Value:D1

PROCESSSWITCH

BSC6900/BSC6910

SET URRCTRLSWITCH

WRFD-010101

WRFD-020124

WRFD-140206

WRFD-150205

WRFD-150299

3GPP R9 Specifications

Uplink Flow Control of User Plane

Layered Paging in URA_PCH

Layered Paging in Idle Mode

Meaning:1)INVOKE_TRACE_SWITCH.

When it is checked, RNC will start Invoke Trace procedure upon receiving INVOKE TRACE Message form CN, otherwise, RNC won't start the Invoke Trace procedure though it receives the INVOKE TRACE message.

2)SYS_INFO_UPDATE_FOR_IU_RST.

When it is checked, RNC will broadcast SYSTEM INFORMATION messages to UE when Iu transmission failure occurs, otherwise, RNC won't broadcast SYSTEM INFORMATION messages to UE when Iu transmission failure occurs.

3)DRNC_DIRECT_DSCR.

When it is checked, DRNC will start DSCR procedure directly in RRC states other than CELL_DCH, otherwise, DRNC will transfer RRC CELL UPDATE message to SRNC.

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7-2

Parameter ID

NE MML Command


4)RNC_SHARE_SWITCH.

When it is checked, the traffic sharing function is enabled, otherwise, the traffic sharing function is disabled, service access will be affected under heavy traffic.

5)RNCAP_IMSI_HO_SWITCH.

When it is checked, Imsi handover function will be used, otherwise it will be not used.

6)TERMINAL_VERSION_DEBASE_SWITCH.

When it is checked, terminal version R4 will debase to R99.

7)SYS_HO_OUT_CIPHER_SWITCH.

When it is checked, the RNC will add ciphering byte at GSM HANDOVER COMMAND if the GSM system do not add any cipher information at that message.

8)SYS_HO_CIPHER_CONFIG.

When it is checked, the cipher configuration in the added cipher byte in GSM will be A5/1.When it is no checked ,the cipher configuration is A5/0.

9)BARRED_CELL_FOR_CSDOMAIN_RST.

When it is checked, cell will be bared when CS domain is invalid, otherwise the CS domain will be bared when CS domain is invalid. It is invalid If SYS_INFO_UPDATE_FOR_IU_RST is not checked.

10)CR2284R1_SWITCH.

In section 8.6.6.28 of

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7-3

Parameter ID

NE MML Command


TS25.331 of R5 Before2006, it describes that the HFN should add one when UE is ciphering in the situation of Timing re-initialized hard handover, while not specified in RB SETUP process in the section of 8.6.4.3. so it is not clear whether to add or not in RB SETUP in DRD scenarios. CR2284R1 clarify that HFN should add one in RB SETUP process with Timing re-initialized hard handover. when it is checked ,RNC accepts this CR2284R1; when it is not checked ,RNC does not accept this CR2284R1.

11)CDT_MSG_FULL_TRACE.

When it is checked, CDT trace function which starts tracing from message RRC CONNECT REQUEST.

12)CR2284R1_COMPATIBLE_SWITCH.

CR2284R1 causes the compatible problem. if UE is not consistent with RNC regarding whether accept the CR2284R1 or not, it will cause the problem of streaming when UEs are communicating with each other. So RNC creates this switch. when it is checked, RNC is auto-adaptive to accept the CR2284R1 according to UE version information. The principles that RNC judges UE whether to accept the CR2284R1 are as follows: R5 and above UE accepts the CR; R99/R4 UE, if it receives the START LIST value from RB SETUP COMPLETE,RNC figures that UE accepts the CR; R99/R4 UE, if it only receives the START value from RB SETUP

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7-4

Parameter ID

NE MML Command


COMPLETE,RNC figures that UE does not accept the CR; when it is not checked, whether RNC accept the CR or not is according to CR2284R1_SWITCH. The relations between these two switches CR2284R1_SWITCH and CR2284R1_COMPATIBLE_SWITCH are as follows:

(1)CR2284R1_COMPATIBLE_SWITCH is checked, RNC is self-compatible, so the CR2284R1_SWITCH is invalid;

(2)CR2284R1_COMPATIBLE_SWITCH is not checked, the CR2284R1_SWITCH is valid.

13)COMBINE_OPERATION_DRD_SWITCH.

When it is on, RNC will not reject the message RB SETUP CMP without the IE active time.

14)UL_INTER_PROTECT_SWITCH.

When the switch is off, RNC will not do integrity protection check for uplink RRC messages.

15)FAST_DORMANCY_SWITCH.

When it is checked, RNC will apply FAST DORMANCY function.

16)SYS_HO_IN_CIPHER_SWITCH.

When it is checked, don't receive the encrypted ability information from RELOC REQ ,default configured of encrypted parameter are UIA1 and UEA0.

17)PTT_EARLY_TRANS_SW

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7-5

Parameter ID

NE MML Command


ITCH_OFF.

When it is checked, PTT user will not apply the early transmission function, otherwise, PTT user will apply the early transmission function.

18)UPLINK_MDC_ENHENCEMENT_SWITCH.

This switch has become invalid.

19)NODEB_PRIVATE_INTERFACE_SWITCH.

When it is checked, the NodeB private interface data can be taken to the NodeB through the IUB protocol message.

20)PTT_SPEC_LI_SWITCH_OFF.

When it is checked, special LI will not be used for PTT user, otherwise, special LI will be used for PTT user.

21)RNC_DF_2_URA_PCH_SWITCH.

When it is checked, RNC will support transferring Fast Dormancy UE from CELL_DCH or CELL_FACH to URA_PCH. When it is not checked, RNC will not support transferring Fast Dormancy UE from CELL_DCH or CELL_FACH to URA_PCH.

22)FD_TAC_MATCH_SWITCH.

When it is checked, RNC will apply FAST DORMANCY function for UE whose TAC is configured in database. When it is not checked, RNC will apply FAST DORMANCY function for UE whose version

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7-6

Parameter ID

NE MML Command


is R5 or later.

23)NONPTT_L1_FAST_SYNC_SWITCH.

When this switch is turned on, if a UE sets up a non-PTT service on the DCH, the RNC includes the Post-verification period information element (IE) in a Uu message to instruct the UE to perform concurrent uplink and downlink synchronization.

When this switch is turned off, if a UE sets up a non-PTT service on the DCH, the RNC does not include the Post-verification period IE in a Uu message. The UE first performs downlink synchronization and then uplink synchronization.

24)URAPCH_LAYERED_PAGING_RT_SWITCH.

Whether the RNC allows Layered Paging in URA_PCH for a UE processing real-time services.

When this switch is turned on, the RNC sends paging messages to the cell on which a UE processing real-time services camped recently and to the neighboring cells of this cell. The RNC pages the UE in the entire UTRAN registration area (URA) only when it does not receive a response from the UE. This significantly reduces the number of paging messages on the Uu interface.

When this switch is turned off, the RNC directly pages the UE in the entire URA.

25)URAPCH_LAYERED_PAGING_NRT_SWITCH.

Whether the RNC allows

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7-7

Parameter ID

NE MML Command


Layered Paging in URA_PCH for a UE processing non-real-time services.

When this switch is turned on, the RNC sends paging messages to the cell on which a UE processing non-real-time services camped recently and to the neighboring cells of this cell. The RNC pages the UE in the entire URA only when the RNC does not receive a response from the UE. This significantly reduces the number of paging messages on the Uu interface.

When this switch is turned off, the RNC directly pages the UE in the entire URA.

26)IDLE_LAYERED_PAGING_NRT_SWITCH.

Whether to enable layered paging for UEs in the idle state who will establish non-real-time service.

When this switch is turned on (selected), the first broadcasts a paging message in the cell who has interacted with the UE for the last time and its neighboring cells. If the UE cannot be paged, the RNC then broadcasts a paging message in the LAC or RAC area.

When this switch is turned off (deselected), the RNC directly broadcasts a paging message in the LAC or RAC area.

27)IDLE_LAYERED_PAGING_RT_SWITCH.

Whether to enable layered paging for UEs in the idle state who will establish real-time service.

When this switch is turned on

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7-8

Parameter ID

NE MML Command


(selected),first broadcasts a paging message in the cell who has interacted with the UE for the last time and its neighboring cells. If the UE cannot be paged, the RNC then broadcasts a paging message in the LAC or RAC area.

When this switch is turned off (deselected), the RNC directly broadcasts a paging message in the LAC or RAC area.

28)INTELLIGENT_WIFI_DETECT_AND_SELECTION.

Whether to enable intelligent Wi-Fi detection and selection for the RNC.

When this switch is turned on, the RNC supports intelligent Wi-Fi detection and selection.

When this switch is turned off, the RNC does not supports intelligent Wi-Fi detection and selection.

29)INTERRAT_LOAD_REPORT_FOR_LTE_SWITCH.

Whether to enable the RIM-based cell load sharing function.

When this switch is turned on, RIM-based load sharing can be achieved between UMTS and LTE cells. Upon receiving a load sharing request from an LTE cell, a UMTS cell responds with its own load information.

When this switch is turned off, UMTS cells do not support the RIM-based cell load sharing function. Therefore, UMTS cells do not respond to load sharing requests from LTE cells.

30)PTUSER_IDENTIFY_SWI

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7-9

Parameter ID

NE MML Command


TCH.

Whether to preferentially guarantee platinum users in terms of network access, voice quality, or PS service rate.

When this switch is turned on, the RNC recognizes platinum users and preferentially guarantees their user experience.

When this switch is turned off, the RNC does not recognize platinum users and does not preferentially guarantee their user experience.

GUI Value Range:INVOKE_TRACE_SWITCH, SYS_INFO_UPDATE_FOR_IU_RST, DRNC_DIRECT_DSCR, RNC_SHARE_SWITCH, RNCAP_IMSI_HO_SWITCH, TERMINAL_VERSION_DEBASE_SWITCH, SYS_HO_OUT_CIPHER_SWITCH, SYS_HO_CIPHER_CONFIG, BARRED_CELL_FOR_CSDOMAIN_RST, CR2284R1_SWITCH, CDT_MSG_FULL_TRACE, CR2284R1_COMPATIBLE_SWITCH, COMBINE_OPERATION_DRD_SWITCH, UL_INTER_PROTECT_SWITCH, FAST_DORMANCY_SWITCH, SYS_HO_IN_CIPHER_SWITCH, PTT_EARLY_TRANS_SWITCH_OFF, UPLINK_MDC_ENHENCEMENT_SWITCH, NODEB_PRIVATE_INTERFACE_SWITCH, PTT_SPEC_LI_SWITCH_OF

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7-10

Parameter ID

NE MML Command


F, RNC_DF_2_URA_PCH_SWITCH, FD_TAC_MATCH_SWITCH, NONPTT_L1_FAST_SYNC_SWITCH, URAPCH_LAYERED_PAGING_RT_SWITCH, URAPCH_LAYERED_PAGING_NRT_SWITCH, IDLE_LAYERED_PAGING_NRT_SWITCH, IDLE_LAYERED_PAGING_RT_SWITCH, INTELLIGENT_WIFI_DETECT_AND_SELECTION, INTERRAT_LOAD_REPORT_FOR_LTE_SWITCH, PTUSER_IDENTIFY_SWITCH

Actual Value Range:INVOKE_TRACE_SWITCH, SYS_INFO_UPDATE_FOR_IU_RST, DRNC_DIRECT_DSCR, RNC_SHARE_SWITCH, RNCAP_IMSI_HO_SWITCH, TERMINAL_VERSION_DEBASE_SWITCH, SYS_HO_OUT_CIPHER_SWITCH, SYS_HO_CIPHER_CONFIG, BARRED_CELL_FOR_CSDOMAIN_RST, CR2284R1_SWITCH, CDT_MSG_FULL_TRACE, CR2284R1_COMPATIBLE_SWITCH, COMBINE_OPERATION_DRD_SWITCH, UL_INTER_PROTECT_SWITCH, FAST_DORMANCY_SWITCH, SYS_HO_IN_CIPHER_SWITCH, PTT_EARLY_TRANS_SWITCH_OFF, UPLINK_MDC_ENHENCEMENT_SWITCH, NODEB_PRIVATE_INTERFA

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7-11

Parameter ID

NE MML Command


CE_SWITCH, PTT_SPEC_LI_SWITCH_OFF, RNC_DF_2_URA_PCH_SWITCH, FD_TAC_MATCH_SWITCH, NONPTT_L1_FAST_SYNC_SWITCH, URAPCH_LAYERED_PAGING_RT_SWITCH, URAPCH_LAYERED_PAGING_NRT_SWITCH,

IDLE_LAYERED_PAGING_NRT_SWITCH,

IDLE_LAYERED_PAGING_RT_SWITCH,

INTELLIGENT_WIFI_DETECT_AND_SELECTION,

INTERRAT_LOAD_REPORT_FOR_LTE_SWITCH,

PTUSER_IDENTIFY_SWITCH

Unit:None

Default Value:INVOKE_TRACE_SWITCH-0&SYS_INFO_UPDATE_FOR_IU_RST-0&DRNC_DIRECT_DSCR-0&RNC_SHARE_SWITCH-1&RNCAP_IMSI_HO_SWITCH-0&TERMINAL_VERSION_DEBASE_SWITCH-0&SYS_HO_OUT_CIPHER_SWITCH-0&SYS_HO_CIPHER_CONFIG-1&BARRED_CELL_FOR_CSDOMAIN_RST-0&CR2284R1_SWITCH-0&CDT_MSG_FULL_TRACE-0&CR2284R1_COMPATIBLE_SWITCH-1&COMBINE_OPERATION_DRD_SWITCH-1&UL_INTER_PROTECT_SWITCH-0&FAST_DORMANCY_SWITCH-0&SYS_HO_IN_CIPHER_SWITCH-0&PTT_EARLY_TRANS_SWITCH_OFF-0&UPLINK_MDC_ENHENCEMENT_SWITCH-0&NODEB_PRIVATE_INTERFACE_SWITCH-0&PTT_

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7-12

Parameter ID

NE MML Command


SPEC_LI_SWITCH_OFF-0&RNC_DF_2_URA_PCH_SWITCH-0&FD_TAC_MATCH_SWITCH-0&NONPTT_L1_FAST_SYNC_SWITCH-0&URAPCH_LAYERED_PAGING_RT_SWITCH-0&URAPCH_LAYERED_PAGING_NRT_SWITCH-0&IDLE_LAYERED_PAGING_NRT_SWITCH-0&IDLE_LAYERED_PAGING_RT_SWITCH-0&INTELLIGENT_WIFI_DETECT_AND_SELECTION-0&INTERRAT_LOAD_REPORT_FOR_LTE_SWITCH-0&PTUSER_IDENTIFY_SWITCH-0

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Fast L1 Synchronization Counters



8-1

8 Counters

There are no specific counters associated with this feature.

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Fast L1 Synchronization Glossary



9-1

9 Glossary

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

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Fast L1 Synchronization Reference Documents



10-1

10 Reference Documents

[1] 3GPP TS 25.214 Physical layer procedures (FDD)

[2] 3GPP TS 25.331 Radio Resource Control (RRC)