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2016-10-05Revert "tbf: Add state WAIT_ASSIGN"sysmocom/revert_WAIT_ASSIGNNeels Hofmeyr1-1/+1
This reverts commit f1a7b8fc6651f92a8b7f3f27b7ca05d07f4e44e0. Conflicts: tests/tbf/TbfTest.err The commit broke GPRS service at least for osmo-bts-sysmo on a SysmoBTS 1002 with current master of osmo-bts (ef30f50d5d6d5f863fc147d05ccdceb89284934e). The error observed is the following log output (was viewing both osmo-bts-sysmo and osmo-pcu logs interleaved): <0002> tbf.cpp:874 TBF(TFI=0 TLLI=0x00000000 DIR=UL STATE=WAIT ASSIGN) T3169 timeout during transsmission <0002> tbf.cpp:893 - Assignment was on CCCH <0002> tbf.cpp:899 - No uplink data received yet <0007> l1sap.c:904 RACH for packet access <0001> pcu_l1_if.cpp:311 RACH request received: sapi=1 qta=0, ra=121, fn=13653 [repeat] When removing this single commit from current osmo-pcu master, GPRS service works well on SysmoBTS, with current osmo-bts master. The TbfTest.err expected output needed adjustment after the revert. Disclaimer: I am not aware of adverse effects this commit may have. I have no idea what the WAIT_ASSIGN state is used for -- further review is required. Change-Id: I1532f8e93194368cdc1e3846f82afa6d68cd5fbd
2016-09-15Fix EGPRS DL window calculation during tbf updateAravind Sirsikar1-5/+2
Earlier there was no handling for recalculation of DL window size during tbf update. Which has been fixed in this patch. Related: OS#1808 Change-Id: I41aa807068520460fd665a55e3529e60f6bbb630
2016-09-15EGPRS: Fix issue with row 4 of Table 10.4.14a.1 of 44.060 version 7.27.0 ↵Aravind Sirsikar1-2/+1
Release 7 row 4 of Table 10.4.14a.1 of Spec 44.060 version 7.27.0 Release 7. Says "The previous RLC data block contains a Upper Layer PDU, or a part of it, that fills precisely the previous data block and for which there is no length indicator in that RLC data block. The current RLC data block contains a Upper Layer PDU that either fills the current RLC data block precisely or continues in the next RLC data block." So when we receive block with 1st LI: value=0 and Value of E bit in the same octet as 1, we expect 2 chunks with 1st chunk as length as 0 and complete and 2nd chunk as length non zero. But with this bug we see only 1 chunk causing incorrect assembling This issue has been fixed in this patch. Related: OS#1811 Change-Id: I2cd0fca3ed28a553ede3f4b8a7d3267284dd2c9b
2016-09-15EGPRS: add test case to show LI decoding bugAravind Sirsikar1-0/+152
This patch adds a test case test_tbf_li_decoding which expects a current bug with LI decoding for row 4 of Table 10.4.14a.1 in 44.060 version 7.27.0 Release 7. The test's expectation is corrected along with the bug fix in a subsequent commit Related: OS#1811 Change-Id: Ida410dab1aa4b0cf3e15b2090586377eb19b2469
2016-09-09Fix Timing Advance handlingMax1-0/+2
* initialize with invalid TA instead of making assumption that phone is located within 550 meters (TA=0) * only set valid TA Change-Id: Idfc40ff0c11bdac13d9e28fbfa4e95dfc6b735b0 Related: OS#1526
2016-08-30DL: add test case to show wrong window sizeAravind Sirsikar1-0/+60
This patch adds a test case test_tbf_update_ws. Which expects a current bug with DL window size calculation. The test's expectation is corrected along with the bug fix in a subsequent commit Related: OS#1808 Change-Id: I4659494c6f93ae89e4cc4ac79fff5fcaf2d23699
2016-08-28TBF flow: unit test compilation error fixAravind Sirsikar1-1/+1
Change-Id: I89638ba908e7d9964a5525061ce0cf26049be438
2016-08-27Change interface in osmo-pcu for 11 bit RACHbhargava1-4/+5
Interface structure between osmo-bts and osmo-pcu is updated with the parameters to differentiate the type of RACH and further support 11 bit RACH. The function prototype and definitions are changed accordingly. Interface version number is increased. Change-Id: I265c2d92d36d6cbcbeee60cdd8407dafe1da06a4
2016-08-25Fix EGPRS PUAN encoding: use correct urbb_lenAravind Sirsikar1-2/+1
Earlier there was an incorrect encoding of PUAN when VQ is not equal VR case for EGPRS UL RLC window. The PCU was encoding the same PUAN message always irrespective of radio condition. This was a bottle neck for performance testing. Which has been fixed in this patch. Related: OS#1793 unit test assertion in the previous commit is fixed in this patch. Change-Id: Iba7b1995028bd81749ffb080616b2ad5f2540d57
2016-08-25EGPRS: PUAN encoding: add test case to show wrong urbb_len issueAravind Sirsikar1-0/+179
This patch adds a test case which expects a current bug with EGPRS PUAN encoding when VQ != VR. The test's expectation is corrected along with the bugfix in a subsequent commit Adds test_tbf_puan_urbb_len to describe the following bug: EGPRS PUAN encoding disregards the urbb_len, leading to identical PUAN messages regardless of the urbb_len. Related: OS#1793 Change-Id: I00662a564f64c0c83627401ae8f7bfef0f0a5de8
2016-08-25Modify EGPRS DL TBF flow to support SPBAravind Sirsikar1-0/+235
Modify the EGPRS DL TBF flow to support Split block during Retx. This patch will also Upgrade the test suite with test cases to validate the EGPRS Downlink SPB for Retransmission Scenarios like MCS6->MCS3, MCS4->MCS1, MCS5->MCS2, MCS9->MCS3 MCS7->MCS2, MCS8->MCS3 have been simulated and Integration tested in NuRAN 1.0 hardware thoroughly. Change-Id: I242afdd8ae7622dec8593b26382ad66bad5b9516
2016-08-02Add support for SPB handling for EGPRS UL TBFAravind Sirsikar1-0/+488
This patch will modify the EGPRS UL TBF flow to support Split block handling. This patch also contains test suite modification for SPB UL. Scenarios like MCS6->MCS3, MCS4->MCS1, MCS5->MCS2, MCS9->MCS3 MCS7->MCS2, MCS8->MCS3 have been simulated and Integration tested in NuRAN 1.0 hardware thoroughly. The scope of Unit testing is limited. Change-Id: I39ca53218b6e0982abc2ab9c703c24c8bf0a09c0
2016-07-26Remove useless ARFCN parameterMax1-5/+5
ARFCN is already part of TRX struct so there's no need to supply it explicitly in a separate parameter. I've tested and those are the same anyway. Change-Id: I8e975c52cbc819427880093b1e5371fe1f8ce460
2016-07-13Add test cases to support ARQ-II for EGPRS DL RetxAravind Sirsikar1-0/+227
During MCS upgradation such as MCS6->MCS9, 2 blocks which were sent separately as MCS6, will be clubbed into one MCS9 block during retransmission. Same holds good for MCS5->MCS7 transistion. During MCS reduction such as MCS9->MCS6,2 blocks which were sent together will be sent separately during the retransmission case. Same is verified through the generated log file. Currently MCS8->MCS6 transition is not supported. The retransmission MCS is being calculated from Table 8.1.1.2 of TS 44.060. The same test cases are also integration tested on Nuran 1.0 platform. Change-Id: Ia357acfe30f4dea95e00749916c6818354f93285
2016-02-08tbf/tests: Add tests for EGPRS TBF establishmentJacob Erlbeck1-16/+153
Add a test for EGPRS two phase access based on RA caps. Add a test for DL TBFs where data block are encoded with each MCS. Sponsored-by: On-Waves ehf
2016-02-08tbf: Add state WAIT_ASSIGNJacob Erlbeck1-1/+1
Currently the state on the TBF is set to ASSIGN when it is created and in general changed to FLOW when it is acknowledged by the MS. The moment when the assignment is really transmitted to the MS (which can take some time) is not reflected by the state. A TBF can considered to be valid, when the assignment is received by the MS. Add the state WAIT_ASSIGN that is entered when the assigment has been send to the MS (more precisely: when the corresponding RTS has been processed or the message has been sent to the BTS). The TBF, its PDCH(s), and its TFI can be assumed to be valid, when the TBF has a state of WAIT_ASSIGN or higher (assuming that the TBF starting time has not been set, which is currently only done for SBA, which are not associated with a TBF). Note that due to queuing in the BTS there can still be a invalid time period for immediate assignments, when the request is lingering in the AGCH or PCH queues. Sponsored-by: On-Waves ehf
2016-02-08tbf: Add and use tbf->poll_tsJacob Erlbeck1-2/+3
Currently tbf->control_ts is used to look up an incoming poll response. Since that may eventually change, poll timeouts could theoretically happen in that case. Store the real poll TS in tbf->poll_ts at all places where tbf->poll_fn is set. Do not use tbf->control_ts to look up outstanding polls. Sponsored-by: On-Waves ehf
2016-02-08tbf: Do not reuse old TBF after RACH requestsJacob Erlbeck1-3/+2
Currently existing TBF can be reused after an MS has sent a RACH request. Since the MS can be or most probably is in packet idle mode in that case, the TBF are no longer usable even if they share the PDCHs and the control TS with the new one. There are occasional freezes where the MS does no longer react to messages sent on the PACCH. This change aborts all pending TBFs if a new TBF is or has been established via RACH. Sponsored-by: On-Waves ehf
2016-02-08edge: Make window size configurableJacob Erlbeck1-0/+56
Currently the window size is fixed to 64 even for EGPRS. Support dynamic window sizes depending on the number of PDCH. The WS can be set to b + f * N_PDCH. If the result is not valid according to TS 44.060, Table 9.1.9.2.1, the value will be corrected to use the next lower valid value (or 64). The following VTY commands are added (config-pcu node): window-size <0-1024> set base (b) value and leave f unchanged window-size <0-1024> <0-256> set base (b) and factor (f) Sponsored-by: On-Waves ehf
2016-02-08edge: Disable GPRS/EGPRS mixed modeJacob Erlbeck1-0/+34
Currently the plain 'egprs' command enables EGPRS but doesn't prevent phones from being served in GPRS mode if they do not support EGPRS. This involves complex frame allocation implementations in dynamic mode, especially if 8PSK is being used. This is due to the inability of non-EGPRS phone to decode 8PSK USF and ES/P altogether. Since polling has a higher priority than USF, collisions will have to be prevented by the PCU by never using an GPRS USF if it refers to a FN that is already being used for polling. This commit just disables mixed usage by ignoring GPRS-only request if EGPRS is enabled. The following VTY command (config-pcu node) is changed: egprs -> egprs only Sponsored-by: On-Waves ehf
2016-02-05tbf/test: Add missing function name printfsJacob Erlbeck1-0/+8
Some test function don't have the "=== start/end ===" printfs. Sponsored-by: On-Waves ehf
2015-12-15edge: Extend gprs_rlcmac_dl_tbf::handle by egprs_ms_classJacob Erlbeck1-5/+5
The multislot (MS) class and the EGPRS MS class can also be passed via BSSGP in an MS Radio Access Capability element which can optionally be contained in a DL-UNITDATA PDU. While this case is fully supported for GPRS, the EGPRS MS class in BSSGP messages is ignored. This commit extends gprs_rlcmac_dl_tbf::handle to pass the EGPRS MS class, too. Note, that the EGPRS class is not yet taken from the CSN.1 RA capability and is always set to 0. Note also, that append_data still uses ms_class only. Sponsored-by: On-Waves ehf
2015-12-15edge: Support EGPRS multislot class handling in tbf_allocJacob Erlbeck1-3/+3
Add an egprs_ms_class argument to the allocation functions and set/pass it where necessary. Sponsored-by: On-Waves ehf
2015-09-01bts: Start a DL TBF if needed after establishment of an UL TBFJacob Erlbeck1-3/+2
Currently an existing DL TBF can get lost in the process of establishing an UL TBF via RACH. This can lead to stalled connections until the network sends more LLC frames. This commit adds a check for a non-empty LLC queue after the UL TBF has been established to rcv_control_ack (GPRS_RLCMAC_UL_ASS_WAIT_ACK path) to eventually establish a new DL TBF on the UL TBF's PACCH. Sponsored-by: On-Waves ehf
2015-09-01tbf: Keep the old MS object alive in extract_tlliJacob Erlbeck1-2/+2
Currently when a second MS object has been created for an MS, because the TLLI was not known yet, the will be detected in gprs_rlcmac_tbf::extract_tlli and the two objects will be merged by update_ms. But when the dl_tbf is moved from the old to the new (second) MS object, the old MS object can get idle and be removed before the object are merged. This can cause LLC frame loss when the MS object is deleted immediately after getting idle (no timeout configured). This commit adds a guard to keep the MS object until extract_tlli has been executed. Sponsored-by: On-Waves ehf
2015-09-01Revert "tbf: Do not kill DL TBF on Packet Resource Request"Jacob Erlbeck1-4/+4
This reverts commit e91bd3babd5c04a154f296607b401a5050dcba31. That commit seems to cause hanging DL TBFs when there was a RACH based UL TBF establishment while it that TBF is active. This could be caused by the use of a different PDCH for the SBA. Conflicts: tests/tbf/TbfTest.cpp tests/tbf/TbfTest.err
2015-08-28l1: Use the FN of all data_ind/ra_ind DSP messagesJacob Erlbeck1-0/+2
Currently all of these messages are discarded if they are assumend to be caused by noise. But even in these cases, the FN and TN values which are added by the DSP are valid. So these can be used to update the current_frame value. The osmo-bts sets the fBFILevel of a physical channel to -200dB if it is used for PDTCH or PACCH which is the case for all PDCH. This way a data_ind or ra_ind message is already send at least once per block period (4 frames) per PDCH. These messages are passed to either handle_ph_data_ind or handle_ph_ra_ind even if they contain garbage data. The ra_ind messages are sometimes sent a few frames earlier than data_ind messages using the same frame. This commit adds calls to update the current_frame value based on all of these messages before they are discarded. The FN taken from ra_ind are passed with an increased max_delay (5) to compensate for early ra_ind messages. Sponsored-by: On-Waves ehf
2015-08-24ms: Store references to replaced TBFs in the MS objectJacob Erlbeck1-3/+1
Currently when calling GprsMs::attach_tbf and a TBF of the same direction already exists, the old TBF gets detached from the MS object. Therefore that TBF object loses access to that MS object including for instance TLLI and IMSI. This leads to failing DL TBF reuses, since the downlink assigment cannot be sent on the PACCH later on because that must be sent on the old DL TBF which ms() is NULL and the new DL TBF cannot be retrieved. This commit fixes this bug by changing the GprsMs implementation to keep a list of replaced (old) TBFs. TBFs are only removed when they are being detached explicitely (see tbf_free and set_ms). Addresses: tbf.cpp:741 We have a schedule for downlink assignment at uplink TBF(TFI=1 TLLI=0xf35a680e DIR=UL STATE=RELEASING), but there is no downlink TBF Sponsored-by: On-Waves ehf
2015-08-24tbf/test: Add test_tbf_dl_reuseJacob Erlbeck1-0/+101
This tests the usage of an existing TBF that is no longer in FLOW state to request a new DL TBF via the old TBF's PACCH. The test triggers a bug that breaks the association between both TBF objects, resulting in packet loss and transmission stalling. Sponsored-by: On-Waves ehf
2015-08-24tbf/test: Do RLC based ack instead of just fakingJacob Erlbeck1-19/+26
Currently the assignment is completed by manipulating the state of the TBF objects directly by setting the state fields to fixed values. This way, the PCU's code that is responsible to update the state accordingly is not tested. This commit changes this to simulate RLC Control Acknowledgement messages instead. Sponsored-by: On-Waves ehf
2015-08-24tbf/test: Rename send_rlc_block to request_dl_rlc_blockJacob Erlbeck1-9/+9
This function basically request the generation of the next downlink RLC block. Since this will no really send somthing to the PCU, the current name can be misleading. This commit just renames the function. Sponsored-by: On-Waves ehf
2015-08-24tbf/test: Simplify RLC block number handlingJacob Erlbeck1-14/+14
The block number can always be deduced from the frame number. The current test code handles the block number explicitely, which makes the code more complex and has also led to block number errors cause by not wrapping the numbers (valid block numbers range from 0 to 11). This commit changes send_rlc_block to always compute the block number based on the frame number. It also turns the block_nr into an optionaly output-only parameter. Sponsored-by: On-Waves ehf
2015-08-24tbf/test: Add send_rlc_block function with a TBF as parameterJacob Erlbeck1-10/+14
The current implementation takes a lot of parameters (bts, trx_no, ...) that can also be taken from a TBF object. This commit adds an alternative variant with just takes a TBF, the fn (in/out), and the block number (in/out). Sponsored-by: On-Waves ehf
2015-08-21tbf/test: Move UL MAC block encoding into a separate functionJacob Erlbeck1-12/+24
This commits adds send_ul_mac_block() to encode and send a RlcMacUplink_t to the PCU. Sponsored-by: On-Waves ehf
2015-08-21tbf: Move pending LLC frames when merging MS objectsJacob Erlbeck1-1/+1
Currently the pending LLC packets are lost in some cases when MS objects are merged, for instance after a RACH when there were 2 MS object for the same MS (they get merged, when the TLLI is known for both objects). This patch modifies GprsMs::merge_old_ms to move all pending LLC packets (if there are any) to the current MS object. Sponsored-by: On-Waves ehf
2015-08-21tbf: Do not kill DL TBF on Packet Resource RequestJacob Erlbeck1-3/+3
Currently all active TBF of an MS are killed if a Packet Resource Request is received from the MS. In general this happens after a RACH request. This does not happen after a resource request that has been included into a Downlink Ack/Nack. Sometimes an UL TBF is requested by an MS via RACH while a DL TBF is running for instance to send a TCP Ack. This can happen, if a former request via PACCH did not work. This commit removes the killing of the DL TBF from gprs_rlcmac_pdch::rcv_resource_request(). Sponsored-by: On-Waves ehf
2015-08-21tbf/test: Add tests for RACH while DL TBFs are activeJacob Erlbeck1-0/+204
This adds tests for - RA update with RACH for the RAUpdateComplete message - RACH for UL while DL is active (LLC queue not empty) Sponsored-by: On-Waves ehf
2015-08-21tbf/test: Fix existing testsJacob Erlbeck1-3/+60
This commit fixes several issues: - Set MS class in request - Set IMSI in establish_ul_tbf_two_phase - Fake assigment acknowledgement in establish_ul_tbf_two_phase - Fix TFI bit offset to 1 (was 2) Sponsored-by: On-Waves ehf
2015-08-21tbf/test: Move UL TBF establishment into separate functionsJacob Erlbeck1-53/+92
Currently the functions test_tbf_single_phase and test_tbf_two_phase do the test logging, BTS intialisation, and the complete message sequencing on their own. Therefore they cannot be used to test more complex sequences like TBF reestablishment. This commit moves the code that does the actual messaging into own functions. The frame number handling is generalised which also fixes a block number wrapping error on the way. Sponsored-by: On-Waves ehf
2015-08-17ns: Add logging supportJacob Erlbeck1-0/+1
Currently there is not support for Network Service (NS) logging. This commit adds the missing definitions and sets the default level to INFO. Further configuration can now be done with the 'logging level ns' VTY command. Sponsored-by: On-Waves ehf
2015-08-17tbf: Clean old MS objects if they have the same TLLIJacob Erlbeck1-7/+12
Currently if an MS retries to access the PCU by using RACH and if there is already an entry for that MS, a duplicated MS object referring to the same TLLI is created. This is caused by blindly setting the TLLI without querying the MS storage to avoid inconsitencies. This leads to several entries in the MS storage that are assigned to the same TLLI. If that happens, 'show ms all' can display multiple entries with the same TLLI (note that an MS object can belong to several TLLIs, so there might be an intersection that is not visible in the list) or 'show tbf all' can show entries with MS_CLASS == 0 in some cases. This commit changes update_ms() to merge and clean up old entries that belong to the given TLLI if they exist. Some data (like the MS class) is copied to the new MS object. Note that TBF belonging to the old MS object are deleted immediately if they have not registered a timer. Sponsored-by: On-Waves ehf
2015-08-13tbf: Always start T3193 when changing state to GPRS_RLCMAC_WAIT_RELEASEJacob Erlbeck1-0/+4
Currently when receiving a PACKET DL ACK/NACK message with the Final Ack Indicator bit set, the TBF's state is set to GPRS_RLCMAC_WAIT_RELEASE but T3193 is only started when the LLC queue is empty. Otherwise the reuse_tbf() method is called to establish a new DL TBF. In that case, the timer is not started. This will leave the current TBF without a timer so it is potentially not released later on. This is recognisable by sticky entries in the output of the 'show tbf all' command and possibly allocation failures if there are too many of them. This commit changes the code to always start T3193 to make sure, that a timer is always active when the the state is set to GPRS_RLCMAC_WAIT_RELEASE. Note that TS 44.060, 9.3.2.6 requests to release the 'old' TBF immediately in some cases, which is not implemented by this change. This will lead to a longer reservation period of the TFI only, which is safer than reassigning it too early. Sponsored-by: On-Waves ehf
2015-07-16tbf: Put the TFI->TBF mapping into the PDCH objectsJacob Erlbeck1-2/+2
Currently the TBFs are registered in a TFI indexed array within the TRX objects. TBFs can be searched globally by TFI and TRX number. This conflicts with the use of the same TFI for different TBF on different PDCH. This use case requires the specification of the PDCH as additional search dimension. This commit moves the TFI index TBF arrays into the PDCH objects. The related methods are updated accordingly. Ticket: #1793 Sponsored-by: On-Waves ehf
2015-07-16tbf: Move TFI selection into alloc_algorithmJacob Erlbeck1-3/+3
Currently the TFI and the TRX have to be determined before the actual TBF allocation function is called, passing TFI and TRX number as parameters. This does fit to TFI reuse for different slots, since this were tightly coupled with the slot selection. This commit just moves the TFI selection into the alloc_algorithm functions. The tfi parameter is removed from the the TFI alloc functions. The trx parameter is changed into use_trx to optionally limit the trx selection (same semantics like in tfi_find_free). Sponsored-by: On-Waves ehf
2015-07-03ms: Add tbf() method to get the TBF based on the directionJacob Erlbeck1-0/+12
To avoid the need for a switch or conditional statement when needing a TBF from an MS object in direction independant code, this method contains that case distinction. For additional flexibility, a reverse() function is added to get the opposite direction. Sponsored-by: On-Waves ehf
2015-07-03tbf/test: Add assertionsJacob Erlbeck1-0/+2
These assertions check for the TBF allocation result before the tbf object is dereferenced the first time. Sponsored-by: On-Waves ehf
2015-06-29tbf: Pass the MS object around instead of old_tbfJacob Erlbeck1-1/+1
Currently the old TBF (either uplink or downlink) is passed around at TBF allocation mainly to get information about the MS. To implement more complex allocation algorithms, the MS object itself will be needed anyway. This commit replaces the old_tbf arguments by MS object arguments. Sponsored-by: On-Waves ehf
2015-06-29tbf: Remove update_tlli methodJacob Erlbeck1-3/+0
This method does not do anything anymore, it's functionality has been taken over by update_ms. This commit removes gprs_rlcmac_tbf::update_tlli completely. Sponsored-by: On-Waves ehf
2015-06-22tbf: Fix downlink packet lossJacob Erlbeck1-2/+2
When the MS is pinged with a longer interval, many packets get lost even if the GprsMs object is kept. If the interval is above the time where the DL TBF is in state FLOW (mainly influenced be the dl-tbf-idle-time command), an new TBF must be requested via AGCH for each ICMP PING message. Currently the LLC frame containing the PING is immediately stored in the TBF and gets lost, if TBF establishment fails for some reason. This commit moves all calls to put_frame() to schedule_next_frame(), where the data is moved from the LLC queue to the frame storage within the TBF object. This method is only called from within create_new_bsn() when the TBF is in the FLOW state and the frame is going to be encoded immediately. At all other places, where put_frame() has been called before, the LLC message is just appended to the LLC queue in the GprsMs object. This change effectively simplifies the related code parts, since date/len information and discard notifications is no longer needed there. Ticket: #1759 Sponsored-by: On-Waves ehf
2015-06-22tbf/test: Add test for DL LLC packet lossJacob Erlbeck1-0/+70
Currently LLC frames are lost or even reordered when the TBF has be established via the AGCH and the procedure fails for some reason. This test tries to reproduce this behaviour by throwing away the first TBF while calling the handle() method several times. The results of create_dl_acked_block() are checked against expected values (this is currently party disabled because the bug still persists). Ticket: #1759 Sponsored-by: On-Waves ehf
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