admission and congestion control - platicas internas v1

Capacity ManagementAdmission Control & Congestion Control

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Capacity management

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Capacity >> LIMITED RESOURSES

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Capacity >> LIMITED RESOURSES

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Capacity Management

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ADMISSION CONTROL

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ADMISSION Control POLICIES

If the resource is:

• Up till the admission level, the request is admitted.

If the resource is:

• Up till the admission level, the request is admitted.

ADMITTEDADMITTED

Between the admission and maximum level, (guaranteed, non-handover) or (non-guaranteed, non-handover/handover) requests are not admitted unless RN Soft Congestionactions can find the required resources to release.

CONDITIONALLY BLOCKEDCONDITIONALLY BLOCKED

BLOCKEDBLOCKED

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Admission Request Attributes

Indication of additional resources required, including additional UL/DLchannelization codes, UL/DL ASE, and so onIndication of additional resources required, including additional UL/DLchannelization codes, UL/DL ASE, and so on

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RAB ASSIGNMENT REQUEST message

IE/Group Name Presence Range IE type and reference

Semantics description

Criticality Assigned Criticality

Message Type M 9.2.1.1 YES rejectRABs To Be Setup Or Modified List

O YES ignore

>RABs To Be Setup Or Modified Item IEs

1 to <maxnoofRABs>

>>First Setup Or Modify Item

M Grouping reason: same criticality

EACH reject

>>>RAB ID M 9.2.1.2 The same RAB ID must only be present in one group.

>>>NAS Synchronisation Indicator

O 9.2.3.18 -

>>>RAB Parameters

O 9.2.1.3 Includes all necessary parameters for RABs (both for MSC and SGSN) including QoS.

IE/Group Name

RAB parameters

>Traffic Class

>RAB Asymmetry Indicator

>Maximum Bit Rate

>Guaranteed Bit Rate

>Delivery Order

>Maximum SDU Size

>SDU parameters

>Transfer Delay

>Traffic Handling Priority

>Allocation/Retention priority

>Source Statistics Descriptor

>Relocation Requirement

>Signalling Indication

>Extended Maximum Bit Rate

RAB ParametersRAB ParametersRAB Assignment Request message IEs

Information Elements

RAB Assignment Request message IEs

Information Elements

25.413 RANAP

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SOFT CONGESTION

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SOFT CONGESTION ALGORITHM

RN Soft Congestion will not target users that have already ongoing HOattempts, or that have been triggered (but not finished) to do soft congestionactions by earlier admission requests.

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SOFT CONGESTION ilustration

128/HS

New User requesting New PS RAB

UL CE Admision Limit Exceeded

Downgrade

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DOWnlink channelization

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Downlink Channelization codes

SF 16SF 32SF 64SF 128SF 256

10 HSDPA codes

3 HS-SCCH

1 user – R99 PS64/384 – SF 8

2 users – R99 PS64/128 – SF 16

4 users – R99 PS64/64 – SF 32

08 Speech users –

SF 128

SF 16SF 32SF 64SF 128SF 256

SF 16SF 32SF 64

26 Hs users – A-DCH

Channels Spread Factor Channels Spread Factor Channels Spread Factor

CPICH 256 PCH 256 HSDPA 16

BCH 256 PICH 256 PS 64/64 32

AICH 256 HS-SCCH 128 PS 64/128 16

FACH 64 Speech 128 PS 64/384 8

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Conditionally Blocked

Soft Congestion

Downlink Channelization

› The admission request can be granted if the resource usage plus the additional SF is below the admission level dlCodeAdm.

› Admission limit (dlCodeAdm) is set to 90% (reserving 10% of the code tree for new handover legs).

Downlink Code Usage % + Additional Request

0%dlCodeAdm

PS R99, HS,

Voice,VT - Setup

Voice,VT - HO

Granted

GrantedGranted

Blocked

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Downlink Channelization

ADMITTEDADMITTED

CONDITIONALLY BLOCKED

BLOCKEDBLOCKED

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DOWnlink Transmitted carrier

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Common Channels

100% (MaxTransmissionPower = MaxDlPowerCapability)

99% (PowerOffset = 14)

85% (PowerAdm = 85)

8 ~ 10%

User Traffic

Admission Control

Congestion Control

DOWnlink Tx carrier power

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› The admission request can be granted if the resource usage plus the additional DL transmitted carrier power is below the admission level pwrAdm.

› Admission limit (pwrAdm) is currently set to 85%.› Monitored Dl Transmitted carrier power is considered for R99 traffic ( No

HSDPA Power)

Downlink Pwr Usage % + Additional Request

0%100%

PS R99, HS,

Voice, VT- Setup

Voice, VT- HO

Granted

GrantedGranted Blocked

PwrAdm

Soft CongestionBlocked

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ADMITTEDADMITTED

CONDITIONALLY BLOCKED

BLOCKEDBLOCKED

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DL & UL Spreading FActors

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› New Requests with SFXX, are denied if number of connections exceed sfXXAdm

› UL SF Histogram Admission Policy–sf4AdmUl, sf8AdmUl, sf16AdmUl, sf8gAdmUl

› DL SF Histogram Monitor Admission Policy–sf8Adm, sf16Adm, sf32Adm, sf16gAdm

Actual configuration

sf4AdmUl = 3

sf8AdmUl= 6

sf16AdmUl = 50

sf8gAdmUl = 6

sf8Adm = 3

sf16Adm = 6

sf32Adm = 12

sf16gAdm = 6

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Downlink Channel

Element Consumption

Downlink Channel

Element Consumption

Uplink Channel

Element Consumption

Uplink Channel

Element Consumption

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UL & DL HW

(Channel Elements)

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UL & DL HW

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› The admission request can be granted if the resource usage plus the additional DL/UL Hardware is below the admission level dlHwAdm/ ulHwAdm.

› Admission limit dlHwAdm=100% (disabled) and ulHwAdm=90%.

UL HW Usage% + Additional Request

0%100%

PS R99, HS,

Voice, VT- Setup

Voice, VT- HO

Granted

GrantedGranted Blocked

ulHwAdm

Soft CongestionBlocked

UL & DL HW

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Other Admission Policies

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ASE Admision Policy› Same behavior for Downlink and Uplink ASE› ASE: Air Interface Speech Equivalents (ASE) in uplink and downlink› This monitor accounts for the air interface resources usage in a cell.› Currently DISABLED: ( No blocks due to UL/DL Ase)

– aseDlAdm=500 (MAX VALUE)– aseUlAdm=500 (MAX VALUE)

PS R99, HS,

Voice, VT - Setup

Voice, VT - HO

Granted

aseDlAdm=500

aseUlAdm=500

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Compressed Mode Admission Policy

The policy aims to control the number of RLs allowed in compressed mode on cell level, in order to limit the amount of DL power peaks caused by SF/2 compressed mode operation.

Serving HS-DSCH Admission Policy

By means of this policy it is possible to limit the number of simultaneous DL scheduled users in a cell, preventing that many users have to share the available resources and get too low throughput. hsdpaUsersAdm, maxNumHsdpaUser.

0 Users hsdpaUsersAdm=52 maxNumHsdpaUsers=64

Number of HS Users

HS Setup

Granted Granted

Granted Blocked Blocked

Blocked

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Serving and Non-serving EUL Admission Policy

RN Admission Control must reject an EUL user, requesting the cell as serving cell if the total number of serving cell EUL users including the requested is above eulServingCellUsersAdm parameter.

EUL users can be in soft/softer handover. It is also possible to be able to limit the EUL users having the cell as non-serving cell. This is to be able to limit the amount of UL hardware reserved for the non-serving connections.

•eulServingCellUsersAdm, eulNonServingCellUsersAdm.

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Congestion Control

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Congestion Control

› Detects and Resolves the following types of overload

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Congestion Detection

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UL RTWP CELL CONGESTION

CongestionCongestionCongestion

solvedCongestion

solvedNo congestionNo congestion

Actually disabled

iFCong = 621= -49.9 dBm iFHyst = 6000 = 60000ms

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UL RSSI EXAMPLE IN HIGH TRAFFIC CELL

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DL Cell Congestion

CongestionCongestion Congestion solved

Congestion solvedNo congestionNo congestion

pwrAdm = 85%

pwrOffset = 14%

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DL CELL CONGESTION EXAMPLE

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DL HSDPA Congestion Detection

CongestionCongestion Congestion solved

Congestion solvedNo congestionNo congestion

maxPowerOverloadHystTime = 10 s

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Congestion Resolve HAndling

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UL RTWP CELL Congestion Resolve Handling

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DL Cell and DL HSDPA CongestionResolve Handling

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Congestion Control Resolve Actions

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CONGESTION CONTROL RESOLVE

= 3 ASE = 1 ASE

= 0.8 s = 2 s

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Practical examples

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Spotting blocking in SMART

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DF0586 RAB Blocking EXAMPLEdue to DL CH Codes & DL Tx Pwr

CR to clear blockingCR to clear blocking

W implementation of HSDPA+ rollback to default parametersW implementation of HSDPA+ rollback to default parameters

New CR to reduce blockingNew CR to reduce blocking

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IF you have a CSSR degradation

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WHAT to look for?

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RRC Blocking

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RAB Blocking

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Congestion

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How to solve it with parametrization?examples for some common issues

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Additional documents

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Additional INFORMATION

› Presentation from previous workshops

› Ericsson document

Presentación de Microsoft Office PowerPoi

Adobe Acrobat Document

admission and congestion control - platicas internas v1

shared radio

lowest retainable

rn soft congestion

ul spreading

guaranteed

exceeded coverage

spreading

admission

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