A.4 The Pre-emption Process

25.4333GPPRelease 17TSUTRAN Iub interface Node B Application Part (NBAP) signalling

The pre-emption process shall only pre-empt Radio Links with lower retention priority than the allocation priority of the Radio Link to be established or modified. The Radio Links to be pre-empted shall be selected in ascending order of the retention priority.

When the pre-emption process detects that one or more Radio Links have to be pre-empted to free resources for a Radio Link(s) to be established or modified, the Node B shall initiate the Radio Link Pre-emption procedure for all the Node B Communication Contexts having Radio Links selected for pre-emption and start the T_Preempt timer.

When enough resources are freed to establish or modify the Radio Link(s) according to the request, the Node B shall stop the T_Preempt timer and complete the procedure that triggered the pre-emption process in accordance with the "Successful Operation" subclause of the procedure.

If the T_Preempt timer expires, the Node B shall regard the procedure that triggered the pre-emption process as failed and complete the procedure in accordance with the "Unsuccessful Operation" subclause of the procedure.

Annex B (informative):
Measurement Reporting

When the Report Characteristics IE is set to "Event A" (figure B.1), the Measurement Reporting procedure is initiated when the measured entity rises above the requested threshold and stays there for the requested hysteresis time. If no hysteresis time is given, the value zero shall be used for the hysteresis time.

Figure B.1: Event A reporting with Hysteresis Time specified

When the Report Characteristics IE is set to "Event B" (figure B.2), the Measurement Reporting procedure is initiated when the measured entity falls below the requested threshold and stays there for the requested hysteresis time. If no hysteresis time is given, the value zero shall be used for the hysteresis time.

Figure B.2: Event B reporting with Hysteresis Time specified

When the Report Characteristics IE is set to "Event C" (figure B.3), the Measurement Reporting procedure is initiated always when the measured entity rises by an amount greater than the requested threshold within the requested time. The reporting in figure B.3 is initiated if the Rising Time T1 is less than the requested time.

Figure B.3: Event C reporting

When the Report Characteristics IE is set to "Event D" (figure B.4), the Measurement Reporting procedure is initiated always when the measured entity falls by an amount greater than the requested threshold within the requested time. The reporting in figure B.4 is initiated if the Falling Time T1 is less than the requested time.

Figure B.4: Event D reporting

When the Report Characteristics IE is set to "Event E" (figure B.5), the Measurement Reporting procedure (Report A) is initiated always when the measured entity rises above the ‘Measurement Threshold 1’ and stays there for the ‘Measurement Hysteresis Time’ (T1 in figure B.5). If Report Periodicity IE is provided Node B shall also initiate Measurement Reporting procedure periodically. The periodic reporting continues although the measured entity falls below the ‘Measurement Threshold 1’ and is terminated by the Report B.

When the Report A conditions have been met and the measured entity falls below the ‘Measurement Threshold 2’ and stays there for the ‘Measurement Hysteresis Time’ (T1) Measurement Reporting procedure (Report B) is initiated and the periodic reporting is terminated.

Figure B.5: Event E reporting with Hysteresis Time specified and Periodic Reporting requested

When the Report Characteristics IE is set to "Event F" (figure B.6), the Measurement Reporting procedure (Report A) is initiated always when the measured entity falls below the ‘Measurement Threshold 1’ and stays there for the ‘Measurement Hysteresis Time’ (T1 in figure B.6). If Report Periodicity IE is provided Node B shall also initiate Measurement Reporting procedure periodically. The periodic reporting continues although the measured entity rises above the ‘Measurement Threshold 1’ and is terminated by the Report B.

When the Report A conditions have been met and the measured entity rises above the ‘Measurement Threshold 2’ and stays there for the ‘Measurement Hysteresis Time’ (T1) Measurement Reporting procedure (Report B) is initiated and the periodic reporting is terminated.

Figure B.6: Event F reporting with Hysteresis Time specified and Periodic Reporting requested

Annex C (informative):
Guidelines for Usage of the Criticality Diagnostics IE