osmo-pcu/tests/ms/MsTest.ok

=== start test_ms_state ===
=== end test_ms_state ===
=== start test_ms_callback ===
  ms_active() was called
  ms_idle() was called
=== end test_ms_callback ===
=== start test_ms_replace_tbf ===
  ms_active() was called
  ms_idle() was called
=== end test_ms_replace_tbf ===
=== start test_ms_change_tlli ===
=== end test_ms_change_tlli ===
=== start test_ms_storage ===
=== end test_ms_storage ===
=== start test_ms_timeout ===
  ms_active() was called
  ms_idle() was called
=== end test_ms_timeout ===
=== start test_ms_cs_selection ===
=== end test_ms_cs_selection ===
ms: Add GprsMs class to hold per-MS information Currently only TBF objects are used to handle the data flow between the MS and the SGSN. MS specific data (e.g. pending LLC frames, TLLI) is copied between successive TBFs. If all TBFs (uplink and downlink) are idle for some time, all information about the MS is discarded in the PCU. This makes the implementation of some features more difficult, e.g. proper TLLI and timing advance handling, connection based CS selection, and proper management of multiple TBF. This commit adds the GprsMs class that is intended to hold information directly related to the MS and to keep references to the active TBFs. The class is not yet integrated with the other PCU code. A GprsMs object container and MS specific fields (TA, CS) will be added in later commits. Note that calling detach_tbf() can possibly delete the MS object depending on the callback implementation. Ticket: #1674 Sponsored-by: On-Waves ehf 2015-05-06 16:30:48 +00:00			`=== start test_ms_state ===`
			`=== end test_ms_state ===`
			`=== start test_ms_callback ===`
			`ms_active() was called`
			`ms_idle() was called`
			`=== end test_ms_callback ===`
			`=== start test_ms_replace_tbf ===`
			`ms_active() was called`
			`ms_idle() was called`
			`=== end test_ms_replace_tbf ===`
ms: Support new and old TLLIs According to the specification (GSM 04.08/24.008, 4.7.1.5) after a new P-TMSI has been assigned, the old P-TMSI must be kept basically until it has been used by both sides. Since the TLLI will be derived from the P-TMSI, the old TLLI must also be kept until the new TLLI has been used by both MS and SGSN. This commit modifies the TLLI handling of GprsMs accordingly. set_tlli() is only used with TLLIs derived from MS messages, confirm_tlli() is used with TLLIs derived from messages received from the SGSN. tlli() returns the value set by the MS. check_tlli() matches each of the TLLI used by either MS or SGSN as well as the old TLLI until it has been confirmed. Sponsored-by: On-Waves ehf 2015-05-15 13:50:43 +00:00			`=== start test_ms_change_tlli ===`
			`=== end test_ms_change_tlli ===`
ms: Add MS storage class Currently the MS objects are contained in the TBF objects only. To allow for an extended life time after the TBF objects have been freed and to find them based on TLLI, a container for the MS objects is needed. This commit adds the container class and also adds the corresponding m_list member to GprsMs. Further integration into the PCU code is not yet done. Ticket: #1674 Sponsored-by: On-Waves ehf 2015-05-12 15:54:33 +00:00			`=== start test_ms_storage ===`
			`=== end test_ms_storage ===`
ms: Add timer Currently the MS object is immediately idle when all TBFs are detached and if no guard is being used. Since the plan is to use the MS objects to pass information from one TBF to the next one even across the gap of some seconds of inactivity, a mechanism is needed to keep the MS objects around for some time. This commit extends the GprsMs class by a timer that keeps the MS objects in non-idle state for some time after all TBFs have been detached. The set_timeout method must be used with a non-zero value to activate this feature. Sponsored-by: On-Waves ehf 2015-05-28 13:43:53 +00:00			`=== start test_ms_timeout ===`
			`ms_active() was called`
			`ms_idle() was called`
			`=== end test_ms_timeout ===`
ms: Reduce DL CS level if only a few LLC bytes are left If just a few bytes are left to send to the MS, it makes sense to reduce the coding scheme level to increase the throughput. This has been shown by Chen and Goodman in their paper "Theoretical Analysis of GPRS Throughput and Delay". See their throughput over C/I measurement graphs (figures 4 and 5 in the paper) for details. This commit implements a simplified CS downgrade feature for the downlink. The coding scheme will be downgraded if there are only a few octets are left to be send over the TBF (see the downgrade-threshold command below) and the NACK rate is not low (the CS will not get degraded on a high quality RF link). As an exception, CS-3 will be degraded to CS-1, since CS-2 does not improve the throughput in general when a few small packets are sent and the signal fades slowly (see Chen/Goodman). The following VTY command is added to the config-pcu node: - cs downgrade-threshold <1-10000> - cs no downgrade-threshold to set the threshold of the number of remaining bytes to be RLC/MAC encoded. The CS will only be reduced, if the number is below the threshold. The 'no' command disables this feature completely. The default value is 200 octets. Sponsored-by: On-Waves ehf 2015-06-12 08:52:34 +00:00			`=== start test_ms_cs_selection ===`
			`=== end test_ms_cs_selection ===`