0006805: CTP_1_1_15_5: CRC error used in IVS Testing

Notes
(0012424) Sebastian Muellers (administrator) 05-11-2014 12:54	What means “Do not send positive LL-ACK" Interpretation: Send nothing or Send negative ACK. TTCN uses negative ACK, as a tester it can decide what it chooses

(0012425) Sebastian Muellers (administrator) 05-11-2014 12:54	EW>> I understand that the TTCN cannot prescribe anything, eventually it can point to alternatives from which the test operator can choose. EW>> If the TCN were to fix a specific way of call clearing who would decide which way ? I understand that for different "actions" TT and R&S and whoever have different procedures implemented... EW>> If decisions were made these would need to be documented so that all parties could align ... EW>> R&S will never send a CRC error. They have not foreseen this as this is not in the scope of the IVS tests. EW>> So this should not be configured like as in the ATS .... So the TC configuration needs to be changed !

(0012426) Sebastian Muellers (administrator) 05-11-2014 12:59	OECON simulate_crc_error: PSAP mode: pretend that received MSD has CRC error IVS mode: calculate and transmit a wrong CRC value In this test we need to achiev that no LL-ACK is sent. We cannot use the OECON command. Proposal: create a new generic command called "do_not_send_ll_ack"

(0012499) Sebastian Muellers (administrator) 12-11-2014 09:44	the statement var ModemConfiguration v_locaPsapSimCfg := modifies c_defaultPsapSimulatorConfiguration := {simulateCrcError := true} forces the modem to send negative acks. This is a correct behaviour for the test. furthermore in TS 126 267 , clause 4.3.1 it is stated: The IVS receiver continues to monitor the feedback messages from the PSAP data modem. As long as the received feedback messages are NACK messages, retransmissions of the MSD with incremental redundancy are automatically continued until a sufficient number of link-layer ACK or higher-layer ACK messages has been received by the IVS, or operation is terminated by the PSAP.

(0012507) Erich Weber (developer) 18-11-2014 08:26	I suggest to add a configuration parameter which is in line with the requirements from CEN 16454, eg "No acknowledgement of MSD" Each tool can map this as appropriate.

(0012532) Cosmin Mogos (developer) 05-12-2014 10:41	Added noAckOfMsd to the modem configuration. Simulate CRC error is still available because it is used in the PSAP testcases.

Issue History
Date Modified	Username	Field	Change
05-11-2014 12:54	Sebastian Muellers	New Issue
05-11-2014 12:54	Sebastian Muellers	Note Added: 0012424
05-11-2014 12:54	Sebastian Muellers	Note Added: 0012425
05-11-2014 12:59	Sebastian Muellers	Note Added: 0012426
12-11-2014 09:44	Sebastian Muellers	Note Added: 0012499
12-11-2014 16:41	Sebastian Muellers	Assigned To	=> Erich Weber
12-11-2014 16:41	Sebastian Muellers	Status	new => feedback
18-11-2014 08:26	Erich Weber	Note Added: 0012507
25-11-2014 15:54	Sebastian Muellers	Assigned To	Erich Weber => Cosmin Mogos
25-11-2014 15:54	Sebastian Muellers	Status	feedback => assigned
05-12-2014 10:41	Cosmin Mogos	Note Added: 0012532
05-12-2014 10:41	Cosmin Mogos	Status	assigned => resolved
05-12-2014 10:41	Cosmin Mogos	Resolution	open => fixed

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