A.4 The Pre-emption Process

25.4233GPPRelease 17TSUTRAN Iur interface Radio Network Subsystem Application Part (RNSAP) 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 DRNS shall initiate the Radio Link Pre-emption procedure for all the UE 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 DRNS 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 DRNS shall reject the procedure that triggered the pre-emption process 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 figureB.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 DRNS 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) the 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 DRNS 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

When the Report Characteristics IE is set to “Event H” (figure B.7), the Measurement Reporting procedure (Report A) is initiated when the measurement value of measured entity rises above the Measurement Threshold 1 and stays above the threshold for the Measurement Hysteresis Time (T₁ in figure B.7).] The measurement value of measured entity in Report A substitutes the Measurement Base value for the consequent measurement reporting.

When the Report A conditions has been met and the measurement value of measured entity rises above or falls below the Measurement Base Value by Measurement Fluctuation Range (H₁ in figure B.7), and stays there for the Measurement Hysteresis Time (T_h in figure B.7) counting from the beginning of every Report Periodicity, the Measurement Reporting procedure (Report B or Report C) is initiated. The the measurement value of measured entity in (Report B or Report C) substitutes the Measurement Base value for the consequent measurement reporting.

When the Report A conditions have been met and the measurement value of measured entity falls below the Measurement Threshold 2 and stays there for the Measurement Hysteresis Time (T_h in figure B.7), the Measurement Reporting procedure (Report D) is initiated and the reporting is terminated.

Figure B.7: Event H reporting with Hysteresis Time specified and Periodic Reporting requested

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