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Measurements in LTE
Posted on 27. Jun, 2013 by sumayakm
in LteWorld Forum
I have the following queries.
1) Are measurement gaps required for intra frequency measurements in LTEi?
2) Can UEi do intra frequency measurements during DRX cycles?
3) What are autonomous gaps? How does eNodeBi come to know of the autonomous gaps used by the UE?
4) What is the rate at which UE PHY gives measurements to the upper layers. Doesnt the Time to trigger value depend on this rate? In that case how does eNodeB come to know of the rate at which UE PHY gives measurements to upper layers?
Can anyone help?
http://lteworld.org/blog/meas
http://lteworld.org/blog/measurements-lte-e-utran should be a good link to look at first.
UEi informs eNB about its autonomous gap capabilty in the UECapabilityInformation message.
From RRCi 36.331 (Rel 9)
if si-RequestForHO is configured for the associated reportConfig: UE performs the corresponding measurements on the frequency and RATi indicated in the associated measObject using autonomous gaps as necessary;
else: perform the corresponding measurements on the frequency and RAT indicated in the associated measObject using available idle periods or using autonomous gaps as necessary;
NOTE : If autonomous gaps are used to perform measurements, the UE is allowed to temporarily abort communication with the serving cell, i.e. create autonomous gaps to perform the corresponding measurements within the limits specified in TS 36.133 [16]. Otherwise, the UE only supports the measurements with the purpose set to 'reportCGI' only if E-UTRANi has provided sufficient idle periods.