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How does measurement configuration and reporting is being done in lte ?

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How does measurement configuration and reporting is being done in lte ?
posted Apr 2, 2015 by Harshita

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2 Answers

+1 vote

There are two uses of measurement configuration and reporting , first while making "handover decision" and second one for "Automatic Neighbor Relationship" (ANR) . So many events like A1, A2, A3, A4, A5, A6, B1 and B2 are defined.

A1 : This event is triggered to indicate eNodeB that UE detects serving cell strength better than the configured threshold. In other words, UE is moving towards cell centre.
A2: This event is triggered to indicate eNodeB that UE detects serving cell strength worst than the configured threshold. In other words, UE is going far way from cell centre.
A3: Neighbor becomes offset better than primary cell.
A4: Neighbor becomes better than threshold.
A5: This event is triggered to indicate eNodeB that source cell is worse than threshold1 and neighbor cell is better than threshold2.
A6: Neighbor becomes offset better than Scell.
B1: Inter RAT neighbor becomes better than threshold.
B2: PCell becomes worse than threshold1 and inter RAT neighbor becomes better than threshold2

There are various types of measurement configuration that can be requested by UE as following:
1. Intra-frequency
2. Inter-frequency
3. Inter-RAT measurements of UTRA frequencies
4. Inter-RAT measurements of GERAN frequencies
5. Inter-RAT measurement of CDMA2000 frequencies

Following terms are used under measurement configuration:
1. Measurement Objects
2. Reporting Configurations
3. Measurement Identities : A list of measurement identity, each measurement identity is associated with one measurement object and one report configuration.
4. Quantity configuration: It is configured per RAT type and it is used to evaluate events
5. Measurement gaps: It tells when UE will perform measurement and no UL/DL transmission will be performed.

answer Apr 3, 2015 by Alok
+1 vote

For ANR, eNodeB can configure periodic measurement for the purpose of reportStrongestCells. UE performs periodic measurement and sends periodically after expiring of reportInterval to eNodeB. On the basis of strongcell measurement, eNodeB can request for reportCGI to UE to send the CGI of neighbor cell. UE sends measurement report including CGI information to UE.

answer Apr 3, 2015 by Veer Pal Singh Yadav
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