Wednesday, May 19, 2010

Measurement report UMTS and LTE

Measu remen t rep o rt 3G

Two types of Measurement reporting is possible in 3G1. Periodic2. Event triggered

Measurement reporting parameters for both Periodic and Event triggered are setthrough system information.

Measurement report is send by the UE if a specific condition fulfilled.

To set the reporting condition, parameters are set in the system information 11 foridle state and system information 12 for connected state. If the parameters are not set

in system information, it could be send through Measurement control.

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3G and 4G Wireless

A valuable Guide for thepeople working in 3G HSDPAHSUPA and LTE wirlesstechnology

F o llo w in g are th e d if fe ren t measu remen t rep o rt in g th a t U E

can P erfo rm: -

1 . In tra -freq u en cy measu remen ts :

Parameter: - CPICH Ec/No, CPICH RSCP, pathloss

Event 1a:

A Primary CPICH enters the reporting range Event 1b:

A Primary CPICH leaves the reporting range Event 1c:

A non-active primary CPICH becomes better than an active primary CPICH

Event 1d: Change of best cell

Event 1e: A Primary CPICH becomes better than an absolute threshold

Event 1f:

A Primary CPICH becomes worse than an absolute threshold

2 . In te r-freq u en cy measu remen ts :

Parameter :- CPICH Ec/No, CPICH RSCPEvent 2a: Change of best frequency

Event 2b: The estimated quality of the currently used frequency is below a certainthreshold and the estimated quality of a non-used frequency is above a certain

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Measurement report UMTS and LTE

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threshold. Event 2c: The estimated quality of a non-used frequency is above a certain threshold

Event 2d: The estimated quality of the currently used frequency is below a certainthreshold

Event 2e: The estimated quality of a non-used frequency is below a certain threshold Event 2f: The estimated quality of the currently used frequency is above a certain

threshold

3 . In te r-R AT measu remen ts :

Parameter: - GSM carrier RSSIEvent 3a: The estimated quality of the currently used UTRAN frequency is below a

certain threshold and the estimated quality of the other system is above acertain threshold. Event 3b:

The estimated quality of other system is below a certain threshold Event 3c: The estimated quality of other system is above a certain threshold Event 3d:

Change of best cell in other system

4 . T ra ff ic V o lu me Measu remen ts

Parameter: - total buffer occupancy (BO) of RLC buffer, average of BOs,

variance of BOs

Event 4a: Transport Channel Traffic Volume becomes larger than an absolute threshold Event 4b:

Transport Channel Traffic Volume becomes smaller than an absolute threshold

5 . Qu ality measu remen ts :

Parameter: - BLER (transport channel block error rate)Event 5a: A predefined number of bad CRCs are exceeded

6 . U E in te rn a l measu remen ts :

Parameter: - UTRA carrier RRSI (intra or interfrequency), UE Transmittedpower, UE Rx-Tx Time differenceEvent 6a:

The UE Tx power becomes larger than an absolute threshold Event 6b: The UE Tx power becomes less than an absolute threshold

Event 6c: The UE Tx power reaches its minimum value Event 6d: The UE Tx power reaches its maximum value Event 6e:

The UE RSSI reaches the UE's dynamic receiver range Event 6f: (FDD) The UE Rx-Tx time difference for a RL included in the active setbecomes larger than an absolute threshold (1.28 Mcps TDD): The time difference indicated by TADV becomes largerthan an absolute threshold

Event 6g: The UE Rx-Tx time difference for a RL included in the active set becomes lessthan an absolute threshold

7 . P o s it io n in g measu remen ts :

Parameter: - UE GPS timing, Synchronization measurements SFN-SFN,

SFN-CFN, GSM carrier observed time differenceEvent 7a:The UE position changes more than an absolute thresholdEvent 7b:SFN-SFN measurement changes more than an absolute thresholdEvent 7c:

GPS time and SFN time have drifted apart more than an absolute thresholdEvent 7d: GANSS time and SFN time have drifted apart more than anabsolute threshold

Measu remen t rep o rts in L T E

1. Event A1 (Serving becomes better than threshold)2. Event A2 (Serving becomes worse than threshold)3. Event A3 (Neighbor becomes offset better than serving)

4. Event A4 (Neighbor becomes better than threshold)5. Event A5 (Serving becomes worse than threshold1 and neighbor becomes

better than threshold2)6. Event B1 (Inter RAT neighbor becomes better than threshold)7. Event B2 (Serving becomes worse than threshold1 and inter RAT neighbor

becomes better than threshold2)

Measurement report UMTS and LTEcomparison

LTE Measurement Eventsand Description

UMTS Measurement Eventsand Description

Comments

Event A1 - Servingbecomes better than

threshold

e2f - The estimated quality ofthe currently used frequency is

above a certain threshold

In LTE this may be used tostop looking for a cell on a

different frequency ortechnology, as e2f is used inUMTS.

Event A2 - Servingbecomes worse than

threshold

e2d - The estimated quality ofthe currently used frequency is

below a certain threshold

In LTE this may be used tostart looking for a cell on a

different frequency ortechnology, as e2d is usedin UMTS.

Event A3 - Neighborbecomes offset better

than serving

e1a - A Primary CPICH entersthe reporting range

This comparison is a bit of astretch. The reason I have

equated them is because inboth cases a neighborshould be considered for ahandover, either soft or harddepending on thetechnology.

Event A4 - Neighborbecomes better thanthreshold

e1e - A Primary CPICHbecomes better than anabsolute threshold

Event A5 - Serving

becomes worse thanthreshold1 and neighborbecomes better thanthreshold2

e2b - The estimated quality of

the currently used frequency isbelow a certain threshold andthe estimated quality of a non-used frequency is above a

This comparison is good for

saying that the current cell isbelow an absolute thresholdand the new cell is above athreshold. This would mean

certain threshold that the current cell is notgood enough and the newone is good, which is agood reason to do a hardhandover (in either

technology).

Event B1 - Inter RATneighbor becomes betterthan threshold

e3c - The estimated quality ofother system is above a certainthreshold

Event B2 - Servingbecomes worse thanthreshold1 and inter RATneighbor becomes betterthan threshold2

e3a - The estimated quality ofthe currently used UTRANfrequency is below a certainthreshold and the estimatedquality of the other system isabove a certain threshold

This comparison is good forsaying that the current cell isbelow an absolute thresholdand the new cell on adifferent technology is abovea threshold. This would

mean that the current cell isnot good enough and thenew one is good, which is agood reason to do a hardhandover to the newtechnology.

Posted by Wireless at 10:47 PM

Labels: Measurement report UMTS and LTE

2 comments:

Anonymous said...

Thanks, this is clear and concise

December 11, 2010 5:22 PM

Anonymous said...

Where is these defined in the specifications ?

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