WPS

Nokia Siemens Networks GSM/EDGE BSS, rel. RG10(BSS), operating documentation, issue 06

Feature description

BSS11149: Wireless Priority Service

DN0294915

Issue 6-1

2 DN0294915Issue 6-1


Id:0900d8058059126e

The information in this document is subject to change without notice and describes only the product defined in the introduction of this documentation. This documentation is intended for the use of Nokia Siemens Networks customers only for the purposes of the agreement under which the document is submitted, and no part of it may be used, reproduced, modified or transmitted in any form or means without the prior written permission of Nokia Siemens Networks. The documentation has been prepared to be used by professional and properly trained personnel, and the customer assumes full responsibility when using it. Nokia Siemens Networks welcomes customer comments as part of the process of continuous development and improvement of the documentation.

The information or statements given in this documentation concerning the suitability, capacity, or performance of the mentioned hardware or software products are given "as is" and all liability arising in connection with such hardware or software products shall be defined conclusively and finally in a separate agreement between Nokia Siemens Networks and the customer. However, Nokia Siemens Networks has made all reasonable efforts to ensure that the instructions contained in the document are adequate and free of material errors and omissions. Nokia Siemens Networks will, if deemed necessary by Nokia Siemens Networks, explain issues which may not be covered by the document.

Nokia Siemens Networks will correct errors in this documentation as soon as possible. IN NO EVENT WILL Nokia Siemens Networks BE LIABLE FOR ERRORS IN THIS DOCUMENTA-TION OR FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO SPECIAL, DIRECT, INDI-RECT, INCIDENTAL OR CONSEQUENTIAL OR ANY LOSSES, SUCH AS BUT NOT LIMITED TO LOSS OF PROFIT, REVENUE, BUSINESS INTERRUPTION, BUSINESS OPPORTUNITY OR DATA,THAT MAY ARISE FROM THE USE OF THIS DOCUMENT OR THE INFORMATION IN IT.

This documentation and the product it describes are considered protected by copyrights and other intellectual property rights according to the applicable laws.

The wave logo is a trademark of Nokia Siemens Networks Oy. Nokia is a registered trademark of Nokia Corporation. Siemens is a registered trademark of Siemens AG.

Other product names mentioned in this document may be trademarks of their respective owners, and they are mentioned for identification purposes only.

Copyright Nokia Siemens Networks 2010. All rights reserved

f Important Notice on Product Safety Elevated voltages are inevitably present at specific points in this electrical equipment. Some of the parts may also have elevated operating temperatures.

Non-observance of these conditions and the safety instructions can result in personal injury or in property damage.

Therefore, only trained and qualified personnel may install and maintain the system.

The system complies with the standard EN 60950 / IEC 60950. All equipment connected has to comply with the applicable safety standards.

The same text in German:

Wichtiger Hinweis zur Produktsicherheit

In elektrischen Anlagen stehen zwangslufig bestimmte Teile der Gerte unter Span-nung. Einige Teile knnen auch eine hohe Betriebstemperatur aufweisen.

Eine Nichtbeachtung dieser Situation und der Warnungshinweise kann zu Krperverlet-zungen und Sachschden fhren.

Deshalb wird vorausgesetzt, dass nur geschultes und qualifiziertes Personal die Anlagen installiert und wartet.

Das System entspricht den Anforderungen der EN 60950 / IEC 60950. Angeschlossene Gerte mssen die zutreffenden Sicherheitsbestimmungen erfllen.

DN0294915Issue 6-1

3


Id:0900d8058059126e

Table of ContentsThis document has 20 pages.

Summary of changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1 Overview of Wireless Priority Service . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2 System impact of Wireless Priority Service . . . . . . . . . . . . . . . . . . . . . . 102.1 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102.2 Impact on transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102.3 Impact on BSS performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102.4 User interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.4.1 BSC MMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.4.2 BTS MMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.4.3 BSC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.4.4 Measurements and counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.5 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122.6 Impact on Network Switching Subsystem (NSS) . . . . . . . . . . . . . . . . . . 132.7 Impact on NetAct products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132.8 Impact on mobile stations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132.9 Impact on interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132.9.1 Impact on radio interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132.9.2 Impact on Abis interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132.9.3 Impact on A interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142.9.4 Impact on Gb interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142.10 Interworking with other features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3 Functionality of Wireless Priority Service. . . . . . . . . . . . . . . . . . . . . . . . 163.1 Access classes in Wireless Priority Service. . . . . . . . . . . . . . . . . . . . . . 163.2 Wireless Priority Service user identifying in the BSC. . . . . . . . . . . . . . . 163.3 Wireless Priority Service and radio traffic channel allocation . . . . . . . . 163.4 Wireless Priority Service and queuing . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4 Implementing Wireless Priority Service overview . . . . . . . . . . . . . . . . . 20

4 DN0294915Issue 6-1


Id:0900d8058059126e

List of FiguresFigure 1 High level description of the RCAP algorithm . . . . . . . . . . . . . . . . . . . . . 17Figure 2 Example of round robin invocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

DN0294915Issue 6-1

5


Id:0900d8058059126e

List of TablesTable 1 Required software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Table 2 Counters of WPS Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Table 3 WPS access classes and priority assignments . . . . . . . . . . . . . . . . . . . 16

6 DN0294915Issue 6-1


Id:0900d8058059126e

DN0294915Issue 6-1

7

BSS11149: Wireless Priority Service Summary of changes

Id:0900d8058059125f

Summary of changesChanges between document issues are cumulative. Therefore, the latest document issue contains all changes made to previous issues.

Changes made between issues 6-1 and 6-0Information on InSite BTS has been removed.

Changes made between issues 6-0 and 5-0The BSS number has been added to the title of the document.

Changes made between issues 5-0 and 4-0Chapters System impact of Wireless Priority Service and Implementing Wireless Priority Service overview have been added.

Chapter User interface of Wireless Priority Service has been removed and its contents have been added to chapter System impact of Wireless Priority Service.

More information on Wireless Priority Service has been added to chapter Overview of Wireless Priority Service.

Changes made between issues 4-0 and 3-0Chapter Functionality of Wireless Priority Service

Information on interworking with Soft Channel Capacity, queuing, pre-emption and Trunk Reservation added.

The document has also been revised throughout to comply with the latest documenta-tion standards.

8 DN0294915Issue 6-1


Id:0900d80580591262

Overview of Wireless Priority Service

1 Overview of Wireless Priority ServiceThe deployment of Wireless Priority Service (WPS) allows qualified and authorised National Security and Emergency Preparedness (NS/EP) users to obtain priority access to radio traffic channels (TCH) in situations where commercial mobile radio service (CMRS) network congestion is blocking call attempts. The priority treatment is applied in the BSC to both mobile-originated and mobile-terminated calls.

WPS is based on a sub-set of the enhanced Multi Level Precedence and Pre-Emption (eMLPP) mechanism and is only provided upon call-by-call invocation. The Nokia imple-mentation uses the Queuing and Priority software in the BSS. WPS is specified by the US authorities and is, therefore, targeted to be used mainly in the US markets. Its main focus is in the radio resource management (RRM) and in the implementation of counters for improving performance management statistics.

In the RRM, WPS handles exceptional traffic conditions when radio resource congestion occurs and when WPS calls are, therefore, on queue due to having encountered radio resource blocking. A percentage or number of a cell's radio resource capacity to serve call attempts is allocated with preference to queued WPS calls. The remaining radio traffic channel capacity is allocated with preference to public user calls, in accordance with the normal dynamics of call arrivals and capacity availability.

The WPS implementation makes it possible to collect statistics on WPS users removed from the queue because of loss of radio contact or because the user has abandoned the call.

g The use of wireless priority service (WPS) software is restricted in the U.S. and U.S. territories to National Security and Emergency Preparedness (NS/EP) users autho-rised by the Office of the Manager, National Communication System (OMNCS). Eligible commercial mobile radio service (CMRS) provider deployment of this WPS software must be co-ordinated with the OMNCS.

Benefits of Wireless Priority ServiceWPS brings improvements to traffic channel allocation and queuing algorithms. It allows the service provider to ensure that a reasonable amount of GSM radio capacity is made available for public users.

Related topics in Wireless Priority Service

System impact of Wireless Priority Service Functionality of Wireless Priority Service Implementing Wireless Priority Service overviewOther related topics

Functional Area descriptions Radio network performance

Handover Signalling in BSC Feature Descriptions

Existing Features Radio network performance

Soft Channel Capacity in BSC Directed Retry in BSC

Value added services

DN0294915Issue 6-1

9

BSS11149: Wireless Priority Service Overview of Wireless Priority Service

Id:0900d80580591262

Radio Resource Pre-emption and Queuing Trunk Reservation

Activate Value added services

Activating and testing BSS11149: Wireless Priority Service in BSC Troubleshoot

Base Station Alarms (70007999) Reference

Commands MML commands

EE - Base Station Controller Parameter Handling in BSC EO - Base Transceiver Station Alarms Handling EQ - Base Transceiver Station Handling in BSC W7 - Licence and Feature Handling

Counters/performance Indicators Packet-switched measurements

103 WPS Measurement Parameters

BSS Radio Network Parameter Dictionary

10 DN0294915Issue 6-1


Id:0900d80580591265

System impact of Wireless Priority Service

2 System impact of Wireless Priority ServiceThe system impact of BSS11149: Wireless Priority Service is specified in the sections below.

For implementation instructions, see the chapter Implementing Wireless Priority Service overview.

WPS requires a valid licence in the BSC.

2.1 RequirementsHardware requirementsNo requirements

Software requirements

Table Required software shows the earliest version that supports WPS.

Frequency band supportThe BSC supports WPS on the following frequency bands:

GSM 800 GSM 900 GSM 1800 GSM 1900

2.2 Impact on transmissionNo impact.

2.3 Impact on BSS performanceOMU signallingNo impact.

Network element Software release required

BSC S11.5

Flexi EDGE BTS No requirements

UltraSite EDGE BTS No requirements

MetroSite EDGE BTS No requirements

Talk-family BTS No requirements

MSC/HLR M12

SGSN Not applicable

NetAct OSS4

Table 1 Required software

DN0294915Issue 6-1

11

BSS11149: Wireless Priority Service System impact of Wireless Priority Service

Id:0900d80580591265

TRX signallingNo impact.

Impact on BSC unitsNo impact.

Impact on BTS unitsNo impact.

2.4 User interface

2.4.1 BSC MMIThe following command groups and MML commands are used to handle WPS:

Base Station Controller Parameter Handling in BSC: EEQ, EEO Base Transceiver Station Handling in BSC: EQF, EQH, EQO Base Transceiver Station Alarms Handling: EOL, EOH Licence and Feature Handling: W7I, W7MFor more information on the command groups and MML commands, see MML com-mands.

2.4.2 BTS MMIWPS cannot be managed with BTS MMI.

2.4.3 BSC parametersThe following parameters are used to handle WPS.

BSC radio network object parameters

time limit WPS (TLW) time limit WPS handover (TLWH) WPS priority capacity (WPIC) WPS preference capacity (WPEC) public served count (PSC)SEG-specific BTS radio network object parameters

max queue length (MQL) queue priority used (QPU) queueing priority call (QPC) queueing priority urgent handover (QPH) queueing priority non-urgent handover (QPN) MS priority used (MPU)For more information on the parameters, see BSS Radio Network Parameter Dictionary.

2.4.4 Measurements and counters The following measurement and counters are used in connection with WPS.

12 DN0294915Issue 6-1


Id:0900d80580591265


103 WPS MeasurementWith the counters of WPS Measurement, you can monitor the performance of traffic channel allocation and queuing algorithms in granting priority access to WPS users.

For more information, see 103 WPS Measurement.

2.5 AlarmsThe following alarm can be generated in connection with WPS:

7763 ACCESS CLASS BARRED

Name Number

WPS AVE OCCU FTCH COUNT 103000

WPS DENOMINATOR 1 103001

WPS AVE OCCU HTCH COUNT 103002


WPS PEAK BUSY FTCH COUNT 103004

WPS PEAK BUSY HTCH COUNT 103005

PEAK WPS QUEUE COUNT 103006

AVE SUCC WPS QUEUE TIME 103007


QUEUED PRI 1 WPS USERS 103009





ALLOC FOR PUB WHILE WPS QUE C 103014

WPS PRI1 NOT ALL QUE DUE LENG 103015





WPS PRI1 REM FROM QUE DUE TIM 103020

WPS PR2 REM FROM QUE DUE TIM 103021

WPS PR3 REM FROM QUE DUE TIM 103022

WPS PRI4 REM FROM QUE DUE TIM 103023

WPS PRI5REM FROM QUE DUE TIM 103024

WPS REM FROM QUE DUE LOSS 103025

WPS REM FROM QUE DUE DR 103026

Table 2 Counters of WPS Measurement

DN0294915Issue 6-1

13


Id:0900d80580591265

This alarm is set every time access class 12, 13, or 14 is set barred in the cell. The barred access class is indicated in the information field of the alarm. The BSC cancels the alarm when the access class is in use again. Setting and cancelling of the alarm is done by the BSC. The alarm is set only if WPS is in use in the BSC.

For more information on the alarm, see Base Station Alarms (70007999).

2.6 Impact on Network Switching Subsystem (NSS)WPS is based on A-Interface Priority Information Control and eMLPP. A-Interface Priority Information Control allows operators to specify different priority levels for calls based on a set of analysed attributes. For more information, see FEATURE 519 A-inter-face Priority Information Control and eMLPP in MSC/HLR Feature Descriptions.

Priority Call Measurement includes WPS-related counters that can be used to monitor WPS in the NSS. For more information, see Priority Call Measurement report (392/188H) in MSC/HLR Product Documentation.

2.7 Impact on NetAct productsNetAct Radio Access Configurator (RAC)NetAct Radio Access Configurator (RAC) can be used to configure the radio network parameters related to WPS. For more information, see BSS RNW Parameters and Implementing Parameter Plans. For a list of the radio network parameters, see the section BSC parameters.

NetAct ReporterThe following measurement is related to WPS:

103 WPS MeasurementNetAct MonitorThe following alarm is related to WPS:

7763 ACCESS CLASS BARREDNetAct TracingNo impact.

2.8 Impact on mobile stationsNo impact.

2.9 Impact on interfaces

2.9.1 Impact on radio interfaceNo impact.

2.9.2 Impact on Abis interfaceNo impact.

14 DN0294915Issue 6-1


Id:0900d80580591265


2.9.3 Impact on A interfaceThe following messages are related to WPS:

QUEUEING INDICATION ASSIGNMENT REQUEST HANDOVER REQUEST

2.9.4 Impact on Gb interfaceNo impact.

2.10 Interworking with other featuresSDCCH handoverIt is not possible to start an SDCCH-to-SDCCH handover for a queued call. If the queued call moves out of the coverage of the serving cell, the BSC terminates the call.

For more information on SDCCH handover, see the chapter SDCCH handover signal-ling in BSC in Handover Signalling in BSC.

Directed RetryIt is not possible to start an inter-BSC Directed Retry handover for a queued WPS user. This is because it is not possible to check the resource situation in the neighbour cell in a different BSC. Instead, the WPS user stays in the queue in the serving cell and waits for a traffic channel to be released.

For more information on Directed Retry, see Directed Retry in BSC.

QueuingRadio resource queuing must be in use in the BSC for WPS to operate.

For more information on Queuing, see Radio Resource Pre-emption and Queuing .

Pre-emptionWPS and pre-emption cannot co-exist in the same network. If WPS is used in the network, pre-emption cannot be used.

For more information on Pre-emption, see Radio Resource Pre-emption and Queuing.

Trunk ReservationWPS and Trunk Reservation cannot co-exist in the same network. If WPS is used in the network, Trunk Reservation cannot be used.

For more information on Trunk Reservation, see Trunk Reservation .

Soft Channel CapacityWith Soft Channel Capacity, it is possible to configure all radio traffic timeslots to dual rate support. This means that more traffic channels (TCHs) can be created in the radio network than are allowed to be activated simultaneously, resulting in extra TCH capac-ity.

If extra TCH capacity is created in a cell, the round robin allocation may be invoked too late so that there are no resources available for an incoming public user in the cell. This situation can be avoided by reducing the values of the WPS priority capacity (WPIC) and WPS preference capacity (WPEC) parameters and increasing the

DN0294915Issue 6-1

15


Id:0900d80580591265

value of the public served count (PSC) parameter. The values of the WPIC and WPEC parameters should be reduced in relation to the amount of extra TCH capacity in the network. For example, if the number of TCHs has been doubled in the network using Soft Channel Capacity, the values of the parameters should be halved.

For more information on Soft Channel Capacity, see Soft Channel Capacity in BSC.

16 DN0294915Issue 6-1


Id:0900d80580591268

Functionality of Wireless Priority Service

3 Functionality of Wireless Priority Service

3.1 Access classes in Wireless Priority ServiceUnder certain circumstances, it is desirable to prevent users from making access attempts to the network. The network regularly broadcasts system information messages on the broadcast control channel (BCCH) to indicate the list of authorised access classes to the mobile stations (MS). If the MS is a member of at least one access class in the list of authorised access classes signalled in the system information messages, the access attempts are allowed. Otherwise the access attempts are not allowed. The wireless priority service (WPS) user is assigned one or more access classes in the range of 12 to 14 in addition to their basic access class.

For more information, see table WPS access classes and priority assignments.

Supervision of access class controlSupervision of access class control is implemented by introducing a new BTS alarm, 7763 ACCESS CLASS BARRED. This alarm is set every time access class 12, 13, or 14 is set barred in the cell. The barred access class is indicated in the information field of the alarm. The BSC cancels the alarm when the access class is in use again.

3.2 Wireless Priority Service user identifying in the BSCA WPS user is assigned one of five priority levels (1, 2, 3, 4, or 5) with 1 being the highest priority level and 5 the lowest priority level.

When WPS is in use, the BSC treats a call as a WPS user if the queuing allowed (QA) indicator is 1 and the MS priority level is 2-6. Other calls are treated as public users.

3.3 Wireless Priority Service and radio traffic channel alloca-tionWPS users are given priority access to the next available radio traffic channel in situa-tions where the commercial mobile radio service (CMRS) network congestion is blocking call attempts. To make sure that a reasonable amount of CMRS radio capacity is made available also for public users, a new traffic channel allocation algorithm has been developed. The radio capacity assurance for the public (RCAP) algorithm is applied when a WPS user accesses a cell. It is also applied when a radio traffic channel

NS/EP priority 48.008 priority 48.008 QA value Access class

1 (highest) 2 1 14, 13, and 12

2 3 1 14, 13, and 12

3 4 1 13 and 12

4 5 1 13 and 12

5 (lowest) 6 1 12

7-14 Implementation dependent

0-10

Table 3 WPS access classes and priority assignments

DN0294915Issue 6-1

17

BSS11149: Wireless Priority Service Functionality of Wireless Priority Service

Id:0900d80580591268

is released and there are WPS users queueing for a traffic channel. For a high level description of the RCAP algorithm, see the figure High level description of the RCAP algorithm.

Figure 1 High level description of the RCAP algorithm

The WPS priority capacity (WPIC) and WPS preference capacity (WPEC) parameters define two load limits which are used to determine whether round robin allo-cation is invoked. When a call attempt is made, the radio resource management of the BSC checks the cell resource usage based on the WPIC and WPEC parameters to deter-mine whether round robin allocation needs to be invoked. While the round robin alloca-tion is invoked, the public served count (PSC) parameter defines the number of public users that must be served in the cell prior to serving the next WPS user. Round robin invocation is illustrated in the figure Example of round robin invocation.

Figure 2 Example of round robin invocation

In this example, round robin allocation is invoked when at least four WPS users occupy the cell and a total of seven or more traffic channels (TCH) are occupied.While round robin is invoked, even if one TCH is idle, the next WPS user is placed in the queue until the number of public users defined by the public served count (PSC) parameter is served.

Round robin allocation is not invoked when fewer than four WPS users occupy the cell or fewer than seven TCHs are occupied in total.

Load calculationWhen the resource usage of a cell is checked and the load of a cell is calculated, the following principles are applied:

Free full rate timeslot is regarded as one working resource. Reserved full rate timeslot is regarded as one working resource and one occupied

resource. Free dual rate timeslot is regarded as three working resources. Half reserved dual rate timeslot is regarded as three working resources and two

occupied resources. Fully reserved dual rate timeslot is regarded as three working resources and three

occupied resources.

WPSPrefCapaRadio

Resource

WPS user has priorityin this portion

WPS user is not restricted whenthe occupied resources are not

larger than this portion

WPSPriCapa

TCH 1 TCH 2 TCH 3 TCH 4 TCH 5 TCH 6 TCH 7 TCH 8

WPSPriCapa50%

WPSPrefCapa75%

(of remaining resources)

18 DN0294915Issue 6-1


Id:0900d80580591268

Functionality of Wireless Priority Service

Free half rate timeslot is regarded as two working resources. Half reserved half rate timeslot is regarded as two working resources and one

occupied resource. Fully reserved half rate timeslot is regarded as two working resources and two

occupied resources. Default GPRS/EDGE timeslots are taken into account in load calculation. Dedicated GPRS/EDGE timeslots are not taken into account in load calculation.The load is calculated in the following way:

cell load = occupied resources / working resources

When the lower load limit defined by the WPS priority capacity (WPIC) param-eter is calculated, the result is rounded upwards. When the upper load limit defined by the WPS priority capacity (WPIC) and WPS preference capacity (WPEC) parameters is calculated, the result is rounded downwards.

3.4 Wireless Priority Service and queuingQueuing of the WPS users is implemented by using the existing queuing procedures in the BSC.

When a WPS call attempt is queued, the value of the time limit WPS (TLW) param-eter defines the queuing time. When a WPS handover attempt is queued, the time limit WPS handover (TLWH) parameter defines the queuing time. By setting the value of the TLWH parameter to 0 you can deny queuing for WPS handovers.When WPS is in use in the BSC, there are two queue buffers, one for public users and one for WPS users. The length of each queue buffer is defined cell by cell by using the max queue length (MQL) parameter. The maximum length for each queue buffer is 32.

The order of queuers is managed with the following parameters:

queue priority used (QPU) queueing priority call (QPC) queueing priority urgent handover (QPH) queueing priority non-urgent handover (QPN) MS priority used (MPU)When WPS is in use, the value of the MS priority used (MPU) parameter should be set to Y. This enables the WPS user with a higher priority to replace a WPS user with a lower priority in a queue. By setting the queue priority used (QPU) parameter value to Y and adjusting the queueing priority non-urgent handover (QPN), queueing priority urgent handover (QPH), and queueing priority call (QPC) parameters, you can prioritise the existing calls (handovers) over the new calls or vice versa.

For more information on queuing, see Radio Resource Pre-emption and Queuing.

Queuing and RCAP algorithmWhen a radio traffic channel becomes available in a cell, it is assigned to a user from the WPS queue or the public queue if either queue is occupied. The RCAP algorithm is used to determine to which queue (WPS or public) the free TCH is given.

DN0294915Issue 6-1

19

BSS11149: Wireless Priority Service Functionality of Wireless Priority Service

Id:0900d80580591268

Queuing and Directed RetryPreviously queuing was interrupted if the max time limit directed retry (MADR) timer had expired although the queuing timer had not yet expired. Now, for WPS, queuing continues after the MADR timer expires.An additional requirement is added to the target cell evaluation when a directed retry handover is started for a WPS user. The resource usage of the target cells is checked. If the load in all target cells is above the upper load limit (defined by the WPS priority capacity (WPIC) and WPS preference capacity (WPEC) parameters), the directed retry procedure is not started. Instead, the WPS user stays in a queue and waits for a traffic channel to be released in the serving cell. In this load checking, only the total load of the cell is checked. The WPS occupancy is not checked. Because of this addi-tional requirement, it is not possible to start a BSC external directed retry handover for a WPS user. It is not possible to check traffic situation of neighbour cells that belong to an adjacent BSC.

For more information on Directed Retry, see Directed Retry in BSC.

20 DN0294915Issue 6-1


Id:0900d8058059126b

Implementing Wireless Priority Service overview

4 Implementing Wireless Priority Service overviewSteps

1 Define the priority levels in the MSC.For more information, seeFEATURE 519 A-interface Priority Information Control and eMLPP in MSC/HLR Feature Descriptions.

2 Activate Wireless Priority Service in the BSC.For detailed instructions, see Activating and Testing BSS11149: Wireless Priority Service in BSC.

BSS11149: Wireless Priority ServiceTable of ContentsList of FiguresList of TablesSummary of changes1Overview of Wireless Priority Service2System impact of Wireless Priority Service2.1Requirements2.2Impact on transmission2.3Impact on BSS performance2.4User interface2.4.1BSC MMI2.4.2BTS MMI2.4.3BSC parameters2.4.4Measurements and counters

2.5Alarms2.6Impact on Network Switching Subsystem (NSS)2.7Impact on NetAct products2.8Impact on mobile stations2.9Impact on interfaces2.9.1Impact on radio interface2.9.2Impact on Abis interface2.9.3Impact on A interface2.9.4Impact on Gb interface

2.10Interworking with other features

3Functionality of Wireless Priority Service3.1Access classes in Wireless Priority Service3.2Wireless Priority Service user identifying in the BSC3.3Wireless Priority Service and radio traffic channel allocation3.4Wireless Priority Service and queuing

4Implementing Wireless Priority Service overview

WPS

Documents

Transcript of WPS