662 lines
16 KiB
C++
662 lines
16 KiB
C++
/* rlc header descriptions
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*
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* Copyright (C) 2012 Ivan Klyuchnikov
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* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#pragma once
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extern "C" {
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#include "coding_scheme.h"
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}
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#include <osmocom/core/endian.h>
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#include <stdint.h>
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#include <string.h>
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#define RLC_GPRS_SNS 128 /* GPRS, must be power of 2 */
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#define RLC_GPRS_WS 64 /* max window size */
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#define RLC_EGPRS_MIN_WS 64 /* min window size */
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#define RLC_EGPRS_MAX_WS 1024 /* min window size */
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#define RLC_EGPRS_SNS 2048 /* EGPRS, must be power of 2 */
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#define RLC_EGPRS_MAX_BSN_DELTA 512
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#define RLC_MAX_SNS RLC_EGPRS_SNS
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#define RLC_MAX_WS RLC_EGPRS_MAX_WS
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#define RLC_MAX_LEN 74 /* MCS-9 data unit */
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struct BTS;
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/* The state of a BSN in the send/receive window */
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enum gprs_rlc_ul_bsn_state {
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GPRS_RLC_UL_BSN_INVALID,
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GPRS_RLC_UL_BSN_RECEIVED,
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GPRS_RLC_UL_BSN_MISSING,
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GPRS_RLC_UL_BSN_MAX,
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};
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enum gprs_rlc_dl_bsn_state {
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GPRS_RLC_DL_BSN_INVALID,
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GPRS_RLC_DL_BSN_NACKED,
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GPRS_RLC_DL_BSN_ACKED,
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GPRS_RLC_DL_BSN_UNACKED,
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GPRS_RLC_DL_BSN_RESEND,
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GPRS_RLC_DL_BSN_MAX,
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};
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/*
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* EGPRS resegment status information for UL
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* When only first split block is received bsn state
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* will be set to EGPRS_RESEG_FIRST_SEG_RXD and when
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* only second segment is received the state will be
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* set to EGPRS_RESEG_SECOND_SEG_RXD. When both Split
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* blocks are received the state will be set to
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* EGPRS_RESEG_DEFAULT
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* The EGPRS resegmentation feature allows MS to retransmit
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* RLC blocks of HeaderType1, HeaderType2 by segmenting
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* them to 2 HeaderType3 blocks(Example MCS5 will be
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* retransmitted as 2 MCS2 blocks). Table 10.4.8b.1 of 44.060
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* explains the possible values of SPB in HeadrType3 for UL
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* direction. When the MCS is changed at the PCU, PCU directs the
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* changed MCS to MS by PUAN or UPLINK ASSIGNMENT message along
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* with RESEGMENT flag, Then MS may decide to retransmit the
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* blocks by resegmenting it based on Table 8.1.1.1 of 44.060.
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* The retransmission MCS is calculated based on current MCS of
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* the Block and demanded MCS by PCU. Section 10.3a.4.3 of 44.060
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* shows the HeadrType3 with SPB field present in it
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*/
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enum egprs_rlc_ul_reseg_bsn_state {
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EGPRS_RESEG_DEFAULT = 0,
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EGPRS_RESEG_FIRST_SEG_RXD = 0x01,
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EGPRS_RESEG_SECOND_SEG_RXD = 0x02,
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EGPRS_RESEG_INVALID = 0x04
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};
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/*
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* EGPRS resegment status information for DL
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* When only first segment is sent, bsn state
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* will be set to EGPRS_RESEG_FIRST_SEG_SENT and when
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* second segment is sent the state will be
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* set to EGPRS_RESEG_SECOND_SEG_SENT.
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* EGPRS_RESEG_DL_INVALID is set to 8 considering there is a scope for
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* 3rd segment according to Table 10.4.8b.2 of 44.060
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* The EGPRS resegmentation feature allows PCU to retransmit
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* RLC blocks of HeaderType1, HeaderType2 by segmenting
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* them to 2 HeaderType3 blocks(Example MCS5 will be
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* retransmitted as 2 MCS2 blocks). Table 10.4.8b.2 of 44.060
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* explains the possible values of SPB in HeadrType3 for DL
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* direction.The PCU decides to retransmit the
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* blocks by resegmenting it based on Table 8.1.1.1 of 44.060.
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* The retransmission MCS is calculated based on current MCS of
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* the Block and demanded MCS by PCU. Section 10.3a.3.3 of 44.060
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* shows the HeadrType3 with SPB field present in it
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*/
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enum egprs_rlc_dl_reseg_bsn_state {
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EGPRS_RESEG_DL_DEFAULT = 0,
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EGPRS_RESEG_FIRST_SEG_SENT = 0x01,
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EGPRS_RESEG_SECOND_SEG_SENT = 0x02,
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EGPRS_RESEG_DL_INVALID = 0x08
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};
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/* Table 10.4.8b.2 of 44.060 */
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enum egprs_rlcmac_dl_spb {
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EGPRS_RLCMAC_DL_NO_RETX = 0,
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EGPRS_RLCMAC_DL_FIRST_SEG = 2,
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EGPRS_RLCMAC_DL_SEC_SEG = 3,
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};
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/*
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* Valid puncturing scheme values
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* TS 44.060 10.4.8a.3.1, 10.4.8a.2.1, 10.4.8a.1.1
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*/
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enum egprs_puncturing_values {
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EGPRS_PS_1,
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EGPRS_PS_2,
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EGPRS_PS_3,
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EGPRS_PS_INVALID,
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};
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/*
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* EGPRS_MAX_PS_NUM_2 is valid for MCS 1,2,5,6.
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* And EGPRS_MAX_PS_NUM_3 is valid for MCS 3,4,7,8,9
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* TS 44.060 10.4.8a.3.1, 10.4.8a.2.1, 10.4.8a.1.1
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*/
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enum egprs_puncturing_types {
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EGPRS_MAX_PS_NUM_2 = 2,
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EGPRS_MAX_PS_NUM_3,
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EGPRS_MAX_PS_NUM_INVALID,
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};
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static inline uint16_t mod_sns_half()
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{
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return (RLC_MAX_SNS / 2) - 1;
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}
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struct gprs_rlc_data_block_info {
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unsigned int data_len; /* EGPRS: N2, GPRS: N2-2, N-2 */
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unsigned int bsn;
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unsigned int ti;
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unsigned int e;
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unsigned int cv; /* FBI == 1 <=> CV == 0 */
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unsigned int pi;
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unsigned int spb;
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};
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struct gprs_rlc_data_info {
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enum CodingScheme cs;
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unsigned int r;
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unsigned int si;
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unsigned int tfi;
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unsigned int cps;
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unsigned int rsb;
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unsigned int usf;
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unsigned int es_p;
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unsigned int rrbp;
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unsigned int pr;
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uint8_t num_data_blocks; /* this can actually be only 0, 1, 2: enforced in gprs_rlc_data_header_init() */
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unsigned int with_padding;
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unsigned int data_offs_bits[2];
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struct gprs_rlc_data_block_info block_info[2];
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};
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/* holds the current status of the block w.r.t UL/DL split blocks */
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union split_block_status {
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egprs_rlc_ul_reseg_bsn_state block_status_ul;
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egprs_rlc_dl_reseg_bsn_state block_status_dl;
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};
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struct gprs_rlc_data {
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/* block data including LI headers */
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uint8_t block[RLC_MAX_LEN];
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/* block data len including LI headers*/
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uint8_t len;
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struct gprs_rlc_data_block_info block_info;
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/*
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* cs_current_trans is variable to hold the cs_last value for
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* current transmission. cs_current_trans is same as cs_last during
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* transmission case. during retransmission cs_current_trans is
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* fetched from egprs_mcs_retx_tbl table based on
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* cs and demanded cs.reference is 44.060 Table
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* 8.1.1.1 and Table 8.1.1.2
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* For UL. cs_last shall be used everywhere.
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*/
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enum CodingScheme cs_current_trans;
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enum CodingScheme cs_last;
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/*
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* The MCS of initial transmission of a BSN
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* This variable is used for split block
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* processing in DL
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*/
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enum CodingScheme cs_init;
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/* puncturing scheme value to be used for next transmission*/
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enum egprs_puncturing_values next_ps;
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/* holds the status of the block w.r.t UL/DL split blocks*/
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union split_block_status spb_status;
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};
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uint8_t *prepare(struct gprs_rlc_data *rlc, size_t block_data_length);
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void gprs_rlc_data_info_init_dl(struct gprs_rlc_data_info *rlc,
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enum CodingScheme cs, bool with_padding, const unsigned int spb);
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void gprs_rlc_data_info_init_ul(struct gprs_rlc_data_info *rlc,
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enum CodingScheme cs, bool with_padding);
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void gprs_rlc_data_block_info_init(struct gprs_rlc_data_block_info *rdbi,
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enum CodingScheme cs, bool with_padding, const unsigned int spb);
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unsigned int gprs_rlc_mcs_cps(enum CodingScheme cs, enum egprs_puncturing_values
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punct, enum egprs_puncturing_values punct2, bool with_padding);
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void gprs_rlc_mcs_cps_decode(unsigned int cps, enum CodingScheme cs,
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int *punct, int *punct2, int *with_padding);
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enum egprs_puncturing_values gprs_get_punct_scheme(enum egprs_puncturing_values
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punct, const enum CodingScheme &cs,
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const enum CodingScheme &cs_current_trans,
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const enum egprs_rlcmac_dl_spb spb);
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void gprs_update_punct_scheme(enum egprs_puncturing_values *punct,
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const enum CodingScheme &cs);
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/*
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* I hold the currently transferred blocks and will provide
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* the routines to manipulate these arrays.
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*/
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struct gprs_rlc {
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void init();
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gprs_rlc_data *block(int bsn);
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gprs_rlc_data m_blocks[RLC_MAX_SNS/2];
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};
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/**
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* TODO: for GPRS/EDGE maybe make sns a template parameter
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* so we create specialized versions...
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*/
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struct gprs_rlc_v_b {
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/* Check for an individual frame */
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bool is_unacked(int bsn) const;
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bool is_nacked(int bsn) const;
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bool is_acked(int bsn) const;
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bool is_resend(int bsn) const;
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bool is_invalid(int bsn) const;
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gprs_rlc_dl_bsn_state get_state(int bsn) const;
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/* Mark a RLC frame for something */
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void mark_unacked(int bsn);
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void mark_nacked(int bsn);
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void mark_acked(int bsn);
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void mark_resend(int bsn);
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void mark_invalid(int bsn);
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void reset();
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private:
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bool is_state(int bsn, const gprs_rlc_dl_bsn_state state) const;
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void mark(int bsn, const gprs_rlc_dl_bsn_state state);
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gprs_rlc_dl_bsn_state m_v_b[RLC_MAX_SNS/2]; /* acknowledge state array */
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};
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/**
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* TODO: The UL/DL code could/should share a base class.
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*/
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class gprs_rlc_window {
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public:
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gprs_rlc_window();
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const uint16_t mod_sns() const;
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const uint16_t mod_sns(uint16_t bsn) const;
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const uint16_t sns() const;
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const uint16_t ws() const;
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void set_sns(uint16_t sns);
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void set_ws(uint16_t ws);
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protected:
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uint16_t m_sns;
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uint16_t m_ws;
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};
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struct gprs_rlc_dl_window: public gprs_rlc_window {
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void reset();
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bool window_stalled() const;
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bool window_empty() const;
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void increment_send();
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void raise(int moves);
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const uint16_t v_s() const;
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const uint16_t v_s_mod(int offset) const;
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const uint16_t v_a() const;
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const uint16_t distance() const;
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/* Methods to manage reception */
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int resend_needed() const;
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int mark_for_resend();
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void update(BTS *bts, char *show_rbb, uint16_t ssn,
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uint16_t *lost, uint16_t *received);
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void update(BTS *bts, const struct bitvec *rbb,
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uint16_t first_bsn, uint16_t *lost,
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uint16_t *received);
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int move_window();
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void show_state(char *show_rbb);
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int count_unacked();
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uint16_t m_v_s; /* send state */
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uint16_t m_v_a; /* ack state */
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gprs_rlc_v_b m_v_b;
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gprs_rlc_dl_window();
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};
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struct gprs_rlc_v_n {
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void reset();
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void mark_received(int bsn);
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void mark_missing(int bsn);
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bool is_received(int bsn) const;
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gprs_rlc_ul_bsn_state state(int bsn) const;
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private:
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bool is_state(int bsn, const gprs_rlc_ul_bsn_state state) const;
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void mark(int bsn, const gprs_rlc_ul_bsn_state state);
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gprs_rlc_ul_bsn_state m_v_n[RLC_MAX_SNS/2]; /* receive state array */
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};
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struct gprs_rlc_ul_window: public gprs_rlc_window {
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const uint16_t v_r() const;
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const uint16_t v_q() const;
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const void set_v_r(int);
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const void set_v_q(int);
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void reset_state();
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const uint16_t ssn() const;
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bool is_in_window(uint16_t bsn) const;
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bool is_received(uint16_t bsn) const;
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void update_rbb(char *rbb);
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uint16_t update_egprs_rbb(uint8_t *rbb);
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void raise_v_r_to(int moves);
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void raise_v_r(const uint16_t bsn);
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uint16_t raise_v_q();
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void raise_v_q(int);
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void receive_bsn(const uint16_t bsn);
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bool invalidate_bsn(const uint16_t bsn);
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uint16_t m_v_r; /* receive state */
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uint16_t m_v_q; /* receive window state */
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gprs_rlc_v_n m_v_n;
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gprs_rlc_ul_window();
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};
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extern "C" {
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/* TS 04.60 10.2.2 */
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#if OSMO_IS_LITTLE_ENDIAN
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struct rlc_ul_header {
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uint8_t r:1,
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si:1,
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cv:4,
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pt:2;
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uint8_t ti:1,
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tfi:5,
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pi:1,
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spare:1;
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uint8_t e:1,
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bsn:7;
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} __attribute__ ((packed));
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struct rlc_dl_header {
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uint8_t usf:3,
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s_p:1,
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rrbp:2,
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pt:2;
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uint8_t fbi:1,
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tfi:5,
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pr:2;
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uint8_t e:1,
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bsn:7;
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} __attribute__ ((packed));
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struct rlc_li_field {
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uint8_t e:1,
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m:1,
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li:6;
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} __attribute__ ((packed));
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struct rlc_li_field_egprs {
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uint8_t e:1,
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li:7;
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} __attribute__ ((packed));
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#else
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# error "Only little endian headers are supported yet. TODO: add missing structs"
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#endif
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}
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inline bool gprs_rlc_v_b::is_state(int bsn, const gprs_rlc_dl_bsn_state type) const
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{
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return m_v_b[bsn & mod_sns_half()] == type;
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}
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inline void gprs_rlc_v_b::mark(int bsn, const gprs_rlc_dl_bsn_state type)
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{
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m_v_b[bsn & mod_sns_half()] = type;
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}
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inline bool gprs_rlc_v_b::is_nacked(int bsn) const
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{
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return is_state(bsn, GPRS_RLC_DL_BSN_NACKED);
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}
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inline bool gprs_rlc_v_b::is_acked(int bsn) const
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{
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return is_state(bsn, GPRS_RLC_DL_BSN_ACKED);
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}
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inline bool gprs_rlc_v_b::is_unacked(int bsn) const
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{
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return is_state(bsn, GPRS_RLC_DL_BSN_UNACKED);
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}
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inline bool gprs_rlc_v_b::is_resend(int bsn) const
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{
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return is_state(bsn, GPRS_RLC_DL_BSN_RESEND);
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}
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inline bool gprs_rlc_v_b::is_invalid(int bsn) const
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{
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return is_state(bsn, GPRS_RLC_DL_BSN_INVALID);
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}
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inline gprs_rlc_dl_bsn_state gprs_rlc_v_b::get_state(int bsn) const
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{
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return m_v_b[bsn & mod_sns_half()];
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}
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inline void gprs_rlc_v_b::mark_resend(int bsn)
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{
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return mark(bsn, GPRS_RLC_DL_BSN_RESEND);
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}
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inline void gprs_rlc_v_b::mark_unacked(int bsn)
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{
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return mark(bsn, GPRS_RLC_DL_BSN_UNACKED);
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}
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inline void gprs_rlc_v_b::mark_acked(int bsn)
|
|
{
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|
return mark(bsn, GPRS_RLC_DL_BSN_ACKED);
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|
}
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|
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inline void gprs_rlc_v_b::mark_nacked(int bsn)
|
|
{
|
|
return mark(bsn, GPRS_RLC_DL_BSN_NACKED);
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|
}
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|
|
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inline void gprs_rlc_v_b::mark_invalid(int bsn)
|
|
{
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|
return mark(bsn, GPRS_RLC_DL_BSN_INVALID);
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|
}
|
|
|
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inline gprs_rlc_window::gprs_rlc_window()
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|
: m_sns(RLC_GPRS_SNS)
|
|
, m_ws(RLC_GPRS_WS)
|
|
{
|
|
}
|
|
|
|
inline const uint16_t gprs_rlc_window::sns() const
|
|
{
|
|
return m_sns;
|
|
}
|
|
|
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inline const uint16_t gprs_rlc_window::ws() const
|
|
{
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|
return m_ws;
|
|
}
|
|
|
|
inline const uint16_t gprs_rlc_window::mod_sns() const
|
|
{
|
|
return sns() - 1;
|
|
}
|
|
|
|
inline const uint16_t gprs_rlc_window::mod_sns(uint16_t bsn) const
|
|
{
|
|
return bsn & mod_sns();
|
|
}
|
|
|
|
inline gprs_rlc_dl_window::gprs_rlc_dl_window()
|
|
: m_v_s(0)
|
|
, m_v_a(0)
|
|
{
|
|
reset();
|
|
}
|
|
|
|
inline const uint16_t gprs_rlc_dl_window::v_s() const
|
|
{
|
|
return m_v_s;
|
|
}
|
|
|
|
inline const uint16_t gprs_rlc_dl_window::v_s_mod(int offset) const
|
|
{
|
|
return mod_sns(m_v_s + offset);
|
|
}
|
|
|
|
inline const uint16_t gprs_rlc_dl_window::v_a() const
|
|
{
|
|
return m_v_a;
|
|
}
|
|
|
|
inline bool gprs_rlc_dl_window::window_stalled() const
|
|
{
|
|
return (mod_sns(m_v_s - m_v_a)) == ws();
|
|
}
|
|
|
|
inline bool gprs_rlc_dl_window::window_empty() const
|
|
{
|
|
return m_v_s == m_v_a;
|
|
}
|
|
|
|
inline void gprs_rlc_dl_window::increment_send()
|
|
{
|
|
m_v_s = (m_v_s + 1) & mod_sns();
|
|
}
|
|
|
|
inline void gprs_rlc_dl_window::raise(int moves)
|
|
{
|
|
m_v_a = (m_v_a + moves) & mod_sns();
|
|
}
|
|
|
|
inline const uint16_t gprs_rlc_dl_window::distance() const
|
|
{
|
|
return (m_v_s - m_v_a) & mod_sns();
|
|
}
|
|
|
|
inline gprs_rlc_ul_window::gprs_rlc_ul_window()
|
|
: m_v_r(0)
|
|
, m_v_q(0)
|
|
{
|
|
m_v_n.reset();
|
|
}
|
|
|
|
inline bool gprs_rlc_ul_window::is_in_window(uint16_t bsn) const
|
|
{
|
|
uint16_t offset_v_q;
|
|
|
|
/* current block relative to lowest unreceived block */
|
|
offset_v_q = (bsn - m_v_q) & mod_sns();
|
|
/* If out of window (may happen if blocks below V(Q) are received
|
|
* again. */
|
|
return offset_v_q < ws();
|
|
}
|
|
|
|
inline bool gprs_rlc_ul_window::is_received(uint16_t bsn) const
|
|
{
|
|
uint16_t offset_v_r;
|
|
|
|
/* Offset to the end of the received window */
|
|
offset_v_r = (m_v_r - 1 - bsn) & mod_sns();
|
|
return is_in_window(bsn) && m_v_n.is_received(bsn) && offset_v_r < ws();
|
|
}
|
|
|
|
inline void gprs_rlc_ul_window::reset_state()
|
|
{
|
|
m_v_r = 0;
|
|
m_v_q = 0;
|
|
}
|
|
|
|
inline const void gprs_rlc_ul_window::set_v_r(int v_r)
|
|
{
|
|
m_v_r = v_r;
|
|
}
|
|
|
|
inline const void gprs_rlc_ul_window::set_v_q(int v_q)
|
|
{
|
|
m_v_q = v_q;
|
|
}
|
|
|
|
inline const uint16_t gprs_rlc_ul_window::v_r() const
|
|
{
|
|
return m_v_r;
|
|
}
|
|
|
|
inline const uint16_t gprs_rlc_ul_window::v_q() const
|
|
{
|
|
return m_v_q;
|
|
}
|
|
|
|
inline const uint16_t gprs_rlc_ul_window::ssn() const
|
|
{
|
|
return m_v_r;
|
|
}
|
|
|
|
inline void gprs_rlc_ul_window::raise_v_r_to(int moves)
|
|
{
|
|
m_v_r = mod_sns(m_v_r + moves);
|
|
}
|
|
|
|
inline void gprs_rlc_ul_window::raise_v_q(int incr)
|
|
{
|
|
m_v_q = mod_sns(m_v_q + incr);
|
|
}
|
|
|
|
inline void gprs_rlc_v_n::mark_received(int bsn)
|
|
{
|
|
return mark(bsn, GPRS_RLC_UL_BSN_RECEIVED);
|
|
}
|
|
|
|
inline void gprs_rlc_v_n::mark_missing(int bsn)
|
|
{
|
|
return mark(bsn, GPRS_RLC_UL_BSN_MISSING);
|
|
}
|
|
|
|
inline bool gprs_rlc_v_n::is_received(int bsn) const
|
|
{
|
|
return is_state(bsn, GPRS_RLC_UL_BSN_RECEIVED);
|
|
}
|
|
|
|
inline bool gprs_rlc_v_n::is_state(int bsn, gprs_rlc_ul_bsn_state type) const
|
|
{
|
|
return m_v_n[bsn & mod_sns_half()] == type;
|
|
}
|
|
|
|
inline void gprs_rlc_v_n::mark(int bsn, gprs_rlc_ul_bsn_state type)
|
|
{
|
|
m_v_n[bsn & mod_sns_half()] = type;
|
|
}
|
|
|
|
inline gprs_rlc_ul_bsn_state gprs_rlc_v_n::state(int bsn) const
|
|
{
|
|
return m_v_n[bsn & mod_sns_half()];
|
|
}
|
|
|
|
inline void gprs_rlc::init()
|
|
{
|
|
memset(m_blocks, 0, sizeof(m_blocks));
|
|
}
|
|
|
|
inline gprs_rlc_data *gprs_rlc::block(int bsn)
|
|
{
|
|
return &m_blocks[bsn & mod_sns_half()];
|
|
}
|