Congestion Indicators for EUL

Congestion Indicators for EUL

Iub overload problems are solved by flow control for Enhanced Uplink highspeed data services. For EUL increased delay is measured internally and thedata flow from RBS in UL is throttled according to measurements recorded,therefore there is no congestion as such but rather the transmission rate of thedata is slowed down in the uplink direction when potential overload is detected.There are counters which can be used to monitor when the Iub tends towardscongestion for EUL services. When that happens it should be considered toexpand the Iub capacity for EUL services.

 

Click Here to get more info on How to Know HSDPA Frame Loss?

• Iub Limiting EUL Performance
• EUL Frame Loss
• EUL Dynamic Delay of Frames

HSDPA Frame Loss

These counters relating to frame loss are available on the RBS to monitor HighSpeed data service in the downlink direction.

IubDataStreams::pmHsDataFramesLostSpiXX
- the number of HSdata frames lost, destroyed and errored over Iub in the RBS. There areseparate counters for each of the priority classes.

IubDataStreams::pmHsDataFramesReceivedSpiXX
- the totalnumber of HS data frames correctly received over Iub in the RBS. Thereare separate counters for each of the priority classes.

The XX suffix represents the priority class and can range from 00 to 15.The counters can be used to indicate data loss rate for the HS service.High frame loss will indicate potential congestion problems. RecommendedPerformance Indicator for this is:



Frame Loss Rate on the path from SRNC to RBS

Find more HSDPA Counters at www.telecomfunda.com/forum

How to get HSDPA users in Ericsson System?

This is the formula:

HSDPA users average cell:

HS_Users = (pmSumBestPsHsAdchRabEstablish) / (pmSamplesBestPsHsAdchRabEstablish)

Click on counter to view detail description in counter.

If you know another way than please share it.

Know more on HSDPA Low Throughput Analysis

What are Events that can trigger the HSDPA Cell Change?

Event 1d HS – Change of Best Cell in the Active Set
Event 1b or Event 1c – Removal of the Best Cell from the Active Set

HSDPA Optimization

HSDPA Planning

How much is your HSDPA (max) link power?

HSDPA link power is typically 4 to 5dB below the maximum NodeB maximum output power.  For example, for 43dBm maximum NodeB power the HSDPA link power is 39dBm.

HSDPA Network Planning Guide

What is Difference between ARQ and HARQ?

HSDPA Measurement Events

How much power usually a NodeB is allocated to control channels?

The power allocated to control channels may depend on equipment vendor recommendation.  Typically no more than 20% of the total NodeB power is allocated to control channels, including CPICH.  However, if HSDPA is deployed on the same carrier then the total power allocated to control channel may go up to 25 to 30% because of the additional HSDPA control channels required.

What is Power Congestion in UMTS?

How We can tune 3G Network?

What are the processing gains for CS and PS services?

CS12.2:      25dB

PS-64:        18dB

PS-128:      15dB

PS-384:      10dB

      HSDPA:       2dB

Click Here to Get
WCDMA Link Budget
GSM Link Budget

What do you understand by CQI Measurements?

Channel Quality Estimation (CQI) for HSDPA sessions only.
In order to aid scheduling and TFRC selection in the RBS, the UE sends a channel quality indicator (CQI) report on the uplink.
The CQI report estimates the number of bits that can be transmitted to the UE using a certain assumed HS-PDSCH power with a block error rate of 10%.

• What are event 2a-2d and 3a-3d?
• Explain Soft and Softer handover? Give some advantage and disadvantage for soft handover
• What is Cell Breathing and why?
• What is the processing gain for 384 Kb/s service?
• What is the family of codes used for Chanelization in WCDMA?

How Power Control is implemented in HSDPA?

Initial Power is set in the same way as open Loop Power control of DCH & there is no further power control on HSDPA Shared Channel HS-DSCH. The Channel Rate is controlled by adaptive modulation & coding formats.
The principles and functionality of the power control for the HSDPA associated dedicated channels are the same as for the DPCH power control.
HS-DPCCH power is an offset relative to DPCCH depending upon whether the UE is in soft handoff or not.
The Power for HS-SCCH is fixed.

Download E Book on WCDMA for UMTS Networks.

You might also like:

• What is cell selection criterion?
• What is Cell Breathing and why?
• What is SIR?
• What is a typical CPICH power?
• What is Significance of Eb_No?

What HS Channels are introduced in HSDPA in L1?

HS-PDSCH – High Speed Physical Downlink Shared Channel
HS-SCCH – High Speed Shared Control Channel

Download WCDMA IRAT Handover Document.

You might also like:

• What are different Idle mode tasks UE performs?
• What is SIR?
• What is Cell Breathing and why?
• What is a typical CPICH power?
• What is Significance of Eb_No?

How much power usually a NodeB is allocated to control channels?

The power allocated to control channels may depend on equipment vendor recommendation. Typically no more than 20% of the total NodeB power is allocated to control channels, including CPICH. However, if HSDPA is deployed on the same carrier then the total power allocated to control channel may go up to 25 to 30% because of the additional HSDPA control channels required.