8.3.22 UE Measurement Initiation [TDD]

25.4233GPPRelease 17TSUTRAN Iur interface Radio Network Subsystem Application Part (RNSAP) signalling

8.3.22.1 General

This procedure is used by a DRNC to request the initiation of UE measurements by the SRNC.

This procedure shall use the signalling bearer connection for the relevant UE Context.

The UE Measurement Initiation procedure shall not be initiated if a Prepared Reconfiguration exists, as defined in subclause 3.1.

8.3.22.2 Successful Operation

Figure 26F: UE Measurement Initiation procedure, Successful Operation

The procedure is initiated with a UE MEASUREMENT INITIATION REQUEST message sent from the DRNC to the SRNC.

Upon receipt the SRNC shall, provided that it determines that the measurement can be performed by the UE, initiate and forward the requested UE measurement according to the parameters given in the UE MEASUREMENT INITIATION REQUEST message. If the UE MEASUREMENT INITIATION REQUEST message includes the UE Measurement Parameter Modification Allowed IE with a value of “Parameter Modification Allowed” the UE Measurement Report Characteristics IE and the Measurement Filter Coefficient IE, if it is included, are suggested values, otherwise the values of these parameters must be fulfilled.

[3.84 Mcps TDD – If the UE Measurement Timeslot Information HCR IE is provided, the measurement request shall apply for the requested timeslot(s) individually. If the UE Measurement Timeslot Information HCR IE are not provided the SRNC may choose the timeslots for measurements that apply to individual timeslots.]

[1.28 Mcps TDD – If the UE Measurement Timeslot Information LCR IE is provided, the measurement request shall apply for the requested timeslot(s) individually. If the UE Measurement Timeslot Information LCR IE are not provided the SRNC may choose the timeslots for measurements that apply to individual timeslots.]

[7.68 Mcps TDD – If the UE Measurement Timeslot Information 7.68 Mcps IE is provided, the measurement request shall apply for the requested timeslot(s) individually. If the UE Measurement Timeslot Information 7.68 Mcps IE are not provided the SRNC may choose the timeslots for measurements that apply to individual timeslots.]

If the UE MEASUREMENT INITIATION REQUEST message includes the Allowed Queuing Time IE the SRNC may queue the request for a time period not to exceed the value of the Allowed Queuing Time IE before starting to execute the request.

The SRNC is required to perform reporting for a UE measurement object, in accordance with the conditions provided in the UE MEASUREMENT INITIATION REQUEST message, as long as the object exists. If no UE measurement object(s) for which a measurement is defined exists any more, the SRNC shall terminate the measurement locally without reporting this to the DRNC.

If at the start of the measurement, the reporting criteria are fulfilled for any of Event 1h, Event 1i,Event 6a, Event 6b, Event 6c, or Event 6d, the SRNC shall initiate the UE Measurement Reporting procedure immediately, and then continue with the measurements as specified in the UE MEASUREMENT INITIATION REQUEST message.

At the start of a periodic measurement, the SRNC shall not initiate UE Measurement Reporting procedure until the next measurement is received from the UE, even if measurement data is available.

Report characteristics

The UE Measurement Report Characteristics IE indicates how the reporting of the dedicated measurement shall be performed. See TS 25.331 [16].

Higher layer filtering

The Measurement Filter Coefficient IE indicates how filtering of the dedicated measurement values shall be performed before measurement event evaluation and reporting. If the Measurement Filter Coefficient IE is not present, a shall be set to 1 (no filtering). The use of the Measurement Filter Coefficient IE is shown in TS 25.331 [16].

Response message

If the SRNC was able to initiate the measurement requested by the DRNC it shall respond with the UE MEASUREMENT INITIATION RESPONSE message. The message shall include the same Measurement ID that was used in the UE MEASUREMENT INITIATION REQUEST message.

If the DRNC allowed parameter modification and the SRNC modified the Measurement Filter Coefficient IE the SRNC shall include the modified value in the UE MEASUREMENT INTIATION RESPONSE message.

If the DRNC allowed parameter modification and the SRNC modified the UE Measurement Report Characteristics IE the SRNC shall include the modified value in the UE MEASUREMENT INTIATION RESPONSE message.

8.3.22.3 Unsuccessful Operation

Figure 26G: UE Measurement Initiation procedure, Unsuccessful Operation

If the requested measurement cannot be initiated, the SRNC shall send a UE MEASUREMENT INITIATION FAILURE message. The message shall include the same Measurement ID IE that was used in the UE MEASUREMENT INITIATION REQUEST message and shall include the Cause IE set to an appropriate value.

Typical cause values are:

Radio Network Layer Causes:

Measurement not Supported For The Object;

Measurement Temporarily not Available;

Measurement Repetition Rate not Compatible with Current Measurements;

UE not Capable to Implement Measurement.

Miscellaneous Causes:

Control Processing Overload;

HW Failure.

8.3.22.4 Abnormal Conditions

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