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2016-02-02rlc: Support encoding of EGPRS header type 1 + 2Jacob Erlbeck1-1/+31
Currently only header type 3 (MCS-1 to MCS-4) is supported. Add header structs to rlc.h and extend Encoding::rlc_write_dl_data_header accordingly. Sponsored-by: On-Waves ehf
2016-02-02rlc: Add unified gprs_rlc_window parent classJacob Erlbeck1-50/+28
Currently gprs_rlc_ul_window and gprs_rlc_dl_window are completely separate classes, containing several identical members and methods. This commit add a shared parent class containing WS and SNS handling. Sponsored-by: On-Waves ehf
2016-02-02WIP: replace window update functions (TODO)Jacob Erlbeck1-0/+4
Ticket: OW#???? Sponsored-by: On-Waves ehf
2016-02-02WIP: Provide and use CS -> CPS conversionJacob Erlbeck1-0/+1
Ticket: OW#???? Sponsored-by: On-Waves ehf
2016-02-02edge: Add encoder for downlink RLC data blocksJacob Erlbeck1-0/+15
Currently the (GPRS) RLC block encoding is done by setting the header fields directly in gprs_rlcmac_dl_tbf::create_new_bsn. This is much more complex with EGPRS, since the data fields are not byte aligned, the header formats depend on the header type, and the mapping of bits to bytes is LSB first. This commit adds Encoding::rlc_write_dl_data_header which writes the header according to the given gprs_rlc_data_header structure. Encoding::rlc_copy_from_aligned_buffer is also added to copy byte sequences into the message. Note that the actual encoding of data units is not yet present. Sponsored-by: On-Waves ehf
2016-02-02edge: Add init functions for gprs_rlc_data_infoJacob Erlbeck1-0/+7
Add the functions gprs_rlc_data_info_init_dl/ul which initialise a gprs_rlc_data_info structure depending on the coding scheme. The fields num_data_blocks, data_offs_bits, cs, and the data_blocks are valid after this call. The other fields are set to 0. The data blocks are initialised to the correct data_len, e == 1 (no extension header field), cv == 15 (not a final block). The other data block fields are set to 0. The gprs_rlc_data_block_info can also be initialised separately by using the gprs_rlc_data_block_info_init function. Sponsored-by: On-Waves ehf
2016-02-01rlc: Add info fields for downlinkJacob Erlbeck1-1/+5
This commit extends gprs_rlc_data_info and gprs_rlc_data_block_info by the fields required for downlink RLC data messages. Sponsored-by: On-Waves ehf
2016-02-01edge: Rename gprs_rlc_ul_header_egprs and gprs_rlc_ul_data_block_infoJacob Erlbeck1-4/+4
These struct names are more specific than necessary. They are used for GPRS (uplink) already. In downlink direction, only a few fields will be added to the header struct. Add addition, gprs_rlc_ul_header_egprs does not map directly to an encoded header, like many other 'header' structs do. Change the names to fit both modes and both directions: gprs_rlc_ul_header_egprs -> gprs_rlc_data_info gprs_rlc_ul_data_block_info -> gprs_rlc_data_block_info Sponsored-by: On-Waves ehf
2016-02-01tbf: Use LListHead instead of llist_podsJacob Erlbeck1-5/+1
LListHead does basically the same like llist_pods, but more C++ish and with type safety. This commit turns the former list field of gprs_rlcmac_tbf into a private field, provides accessors, moves the related code from pcu_vty.c to pcu_vty_functions.cpp, and removes the llist_pods type and related code. Sponsored-by: On-Waves ehf
2016-02-01rlc: Make WS and SNS variableJacob Erlbeck1-7/+28
Currently the values for WS and SNS are fixed to 64 (WS) and 128 (SNS) which are the only values that can be used with GPRS. On the other hand, EGPRS requires an SNS of 2014 and a WS in the range of 64 to 1024. This commit adds member variables and setters to both window classes. By default, the GPRS values are being used. Sponsored-by: On-Waves ehf
2016-02-01rlc: Add constructor to window classesJacob Erlbeck1-0/+16
Currently the gprs_rlc_dl_window and gprs_rlc_ul_window do not have constructors, but need to get initialized explicitly. This commit adds constructors to both classes and removes explicit external initialization code. Sponsored-by: On-Waves ehf
2016-02-01rlc/edge: Consistently use uint16_t for BSNs and SSNsJacob Erlbeck1-5/+5
Currently in some places uint8_t is being used to encode BSNs and SSNs. This is inconsistent and (even worse) not enough for EPGRS which uses an SNS of 2014. This commit changes these to uint16_t. Sponsored-by: On-Waves ehf
2016-02-01rlc: Add and use mod_sns(bsn) methodJacob Erlbeck1-4/+16
Currently there is only a mod_sns() method which is being used in expression like bsn_expr & win.mod_sns(). This only works, because it is known that mod_sns() is (sns() - 1) where sns() in turn is always 2^n. This is error prone, hard to read, and relies on window specifics that should be kept inside the respective module. This commit adds a mod_sns(uint bsn) method to gprs_rlc_ul_window and gprs_rlc_dl_window, that encapsulates and hides this optimized computation. Sponsored-by: On-Waves ehf
2015-12-16edge: Add methods for unified GPRS/EGPRS UL data block handlingJacob Erlbeck1-0/+1
The current rcv_data_block_acknowledged_gprs method is tightly coupled to GPRS. This commit adds variants of the involved methods that support EGPRS and GPRS RLC encodings likewise. Sponsored-by: On-Waves ehf
2015-12-16edge: Store GprsCodingScheme in gprs_rlc_dataJacob Erlbeck1-1/+1
Currently the coding scene is stored as number N, where there scheme is CS-N. This commit replaces this by a GprsCodingScheme type cs value. The gprs_rlcmac_cs table is no longer needed and thus removed. Sponsored-by: On-Waves ehf
2015-12-16edge: Add is_received and invalidate_bsn to gprs_rlc_ul_windowJacob Erlbeck1-0/+11
These methods will be needed for EGPRS decoding. The is_received method returns true iff a block with the given BSN has already been received in the current window. A call to invalidate_bsn marks the block as not received. Sponsored-by: On-Waves ehf
2015-12-16rlc: Do not raise_v_q in receive_bsnJacob Erlbeck1-1/+1
Currently gprs_rlc_ul_window::receive_bsn calls raise_v_q and returns the number of RLC data blocks that can be taken from the queue. This does not fit the EGPRS feature to put 2 independant data blocks in a single RLC block. This commit removes raise_v_q from receive_bsn, hence it must be called explicitely to get the number of processable data blocks. Sponsored-by: On-Waves ehf
2015-12-16edge: Add unified decoder methods for GPRS/EGPRSJacob Erlbeck1-0/+46
This commit adds new RLC block decoder functions that support both GPRS and EGPRS. The code path is selected based on the value of the GprsCodingScheme cs object. - rlc_parse_ul_data_header parses the header of an RLC data block including the E and FBI/TI flags (currently supported CS-1 - CS-4, MCS-1 - MCS-4). - rlc_copy_to_aligned_buffer copies an RLC data unit to a byte aligned buffer and returns the unit's length. - rlc_get_data_aligned is a convenience wrapper around rlc_copy_to_aligned_buffer that avoids copying if the data unit is already byte aligned. Sponsored-by: On-Waves ehf
2015-12-15rlc: Check endianness for bit field declarationsJacob Erlbeck1-0/+6
Currently the declarations of rlc_ul_header, rlc_dl_header, and rlc_li_field silently assume that a gcc for a little endian platform is being used. This commit adds '#if OSMO_IS_LITTLE_ENDIAN' the ensure the correct byte ordering. Sponsored-by: On-Waves ehf
2015-06-08tbf: Add adaptive DL CS adjustmentJacob Erlbeck1-0/+2
To cope with transmission failures due to bad radio conditions, a different coding scheme with more redundance can be used. This commit adds an implemenation that is based on the Ack/Nack ratio per PACKET DOWNLINK ACK/NACK message received from the MS. Basically the CS level is decreased, if the block error rate goes above cs_adj_upper_limit (default 33%), and it is increased, if the rate drops below cs_adj_lower_limit (default 10%). Only blocks that have been encoded with the current CS are taken into account. Note that this approach doesn't measure the MS->BTS conditions and that the measurement values reported by the MS are not taken into account. Ticket: #1739 Sponsored-by: On-Waves ehf
2014-08-07tbf, ...: Make the fields in the dl/ul struct member variablesDaniel Willmann1-0/+1
There is no need for the union/struct anymore. Make the variable members of the UL/DL class. As a result gprs_rlc_dl_window gets a reset() method because memset(&dir.dl, 0, sizeof(dir.dl)) doesn't work anymore in reuse_tbf(). Ticket: SYS#389 Sponsored by: On-Waves ehf
2014-07-02misc: Do not mix struct/class in the forward declarationHolger Hans Peter Freyther1-1/+1
2014-01-15rlc: Rename state() to show_state() to better reflect its functionDaniel Willmann1-1/+1
show_state() is only used for debugging output to make the v(b) array human readable.
2014-01-15rlc: Use an enum for the state array instead of charsDaniel Willmann1-31/+45
gprs_rlc_bsn_state is now used to hold the ACK state of sent/received rlc packets.
2014-01-15rlc/tbf: Move v_b into DL windowDaniel Willmann1-38/+46
Move functions resend_needed(), mark_for_resend(), update(), move_window(), state(), count_unacked() out of v_b directly into the UL window and provide a function get_state in v_b to access the v_b elements.
2014-01-15rlc/tbf: Add function receive_bsn that updates v_r, v_q, v_nDaniel Willmann1-0/+2
We don't need to expose the mecanics of updating the variables to the outside.
2014-01-15rlc/tbf: Move v_n into gprs_rlc_ul_window and adapt the testsDaniel Willmann1-18/+20
v_n is part of the UL window handling so move it inside the ul_window
2014-01-15rlc: Rename the simple raise_v_r method to avoid naming conflictsDaniel Willmann1-2/+2
2013-12-12rlc: Manage the received block bitmap in the ul_windowDaniel Willmann1-0/+8
Added two methods to gprs_rlc_ul_window * ssn() returns the starting sequence number * update_rbb() returns an array of chars representing the state of the received block bitmap. Each element is either 'I'nvalid or 'R'eceived. The rbb is generated from v_n rbb[63] relates to BSN ssn-1 ... rbb[0] relates to BSN ssn-64
2013-12-04rlc: Make the RLC types only operate on the BSNHolger Hans Peter Freyther1-71/+77
The code has an internal optimization to only use window_size space. This means that the caller needed to know that only half of the size was used. Change the API to work on the BSN and do the mapping internally. The compiler should have plenty of opportunity to propagate the constant(s) but this has not been verified.
2013-11-26tbf/rlc: Move raising of V(Q) into the ul window codeHolger Hans Peter Freyther1-5/+6
2013-11-26rlc/tbf: Move the code to raise V(R) into the ul_window handlingHolger Hans Peter Freyther1-0/+3
2013-11-26tbf/rlc: Move the putting of a block into the rlc codeHolger Hans Peter Freyther1-0/+1
2013-11-26tbf/rlc: Move the check if something is in the window out.Holger Hans Peter Freyther1-0/+13
2013-11-26rlc: The bsn has never been used. Remove it from the Xl_windowHolger Hans Peter Freyther1-2/+0
2013-11-26rlc: Test the basic of the gprs_rlc_v_n code for remembering the stateHolger Hans Peter Freyther1-1/+6
2013-11-26tbf/rlc: Move the v_n handling into a dedicated objectHolger Hans Peter Freyther1-0/+30
2013-11-26tbf/rlc: Big change and move the window handling out to the rlcHolger Hans Peter Freyther1-12/+161
The send and receive window is now managed by an external object. There are some issues that can only be solved with C++11 but it is progres and removes some of the spaghetti code. For GPRS the sns and ws is hardcoded. Move that into the window code.
2013-11-26tbf/rlc: Move the counting of unacked frames into the RLC V_B classHolger Hans Peter Freyther1-0/+2
Whenwe receive a final ack we assume that all the unacked frames have been acked now. Move the counting to V_B and now the caller can remove the BSN and the "lost" variable which has always been zero.
2013-11-26tbf/rlc: Change the code and generate the entire state in the V_BHolger Hans Peter Freyther1-7/+2
2013-11-26tbf/rlc: Move the moving of V(A) into the V_B codeHolger Hans Peter Freyther1-0/+2
Move the code that moves the V_B to the first not acked frame. Return how many indexes the V_B was moved and update the V_A in the caller.
2013-11-26tbf/rlc: Move the parsing of RBB to Decoding, move window marking outHolger Hans Peter Freyther1-0/+8
Move the parsing of the bitbmap out of the TBF code into Decoding. Move the updating of the V_B into the V_B class. Add some comments about handling the mod_sns, mod_sns_half parameters by using template code.
2013-11-26tbf/rlc: Move the marking of frames for resend into the v_bHolger Hans Peter Freyther1-0/+2
2013-11-26rlc/tbf: Move the loop into the gprs_rlc_v_b classHolger Hans Peter Freyther1-0/+5
2013-11-23rlc: Create a basic test that mark/is is talking about the sameHolger Hans Peter Freyther1-1/+7
2013-11-23rlc: Move the rlc headers into a separate header fileHolger Hans Peter Freyther1-0/+106
2013-10-30pdch/tbf: Move gprs_rlcmac_rcv_data_block_acknowledged into the pdchHolger Hans Peter Freyther1-0/+56
Move the method into the PDCH. Extract the finding of TLLI into a new class called Decoding. Move the assemble and forward LLC frames into the TBF as it is poking in the internals of the TBF.
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