Table of Contents

gen_mch_tables.h

gen_mch_tables.c

我在代码里做出了注释，如下：

sf_alloc -> 1234 4321 2345 5432 3456 6543 4567 7654  -> total 32bits\  1  /\  2  / \  3  /\  4  /
sf_alloc>>18                                23 4554
table[ 1, 2, 3, 6, 7, 8] = 234554sf_alloc>>12                                32 3456
table[11,12,13,16,17,18] = 323456sf_alloc>>6                                 65 4345
table[21,22,23,26,27,28] = 654345sf_alloc>>0                                 67 7654
table[31,32,33,36,37,38] = 677654Finally:
table[...] 02340 05540 03230 04560 06540 03450 06770 06540   -> 40 uint8_t\    1    / \    2    / \    3    / \    4    /

gen_mch_tables.h

lib\include\srslte\common 1581 4/5/2019

/**** \section COPYRIGHT** Copyright 2013-2015 Software Radio Systems Limited** \section LICENSE** This file is part of the srsUE library.** srsUE is free software: you can redistribute it and/or modify* it under the terms of the GNU Affero General Public License as* published by the Free Software Foundation, either version 3 of* the License, or (at your option) any later version.** srsUE is distributed in the hope that it will be useful,* but WITHOUT ANY WARRANTY; without even the implied warranty of* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the* GNU Affero General Public License for more details.** A copy of the GNU Affero General Public License can be found in* the LICENSE file in the top-level directory of this distribution* and at http://www.gnu.org/licenses/.**/#ifndef GEN_MCH_TALBES_H
#define GEN_MCH_TALBES_H/******************************************************************************* Common mch table generation - used in phch_common of UE and ENB for MBMS*****************************************************************************/
#include <pthread.h>
#include <string.h>
#include <stdint.h>#ifdef __cplusplus
extern "C" {
#endif // __cplusplusvoid generate_frame_mch_table(uint8_t *table, uint8_t alloc);
void generate_mch_table(uint8_t *table, uint32_t sf_alloc, uint8_t num_frames); //mch multicase channel
void generate_mcch_table(uint8_t *table, uint32_t sf_alloc); //Main Control Channel_主控信道#ifdef __cplusplus
}
#endif // __cplusplus#endif // SECURITY_H

gen_mch_tables.c

lib\src\common 2748 4/5/2019 25

/**** \section COPYRIGHT** Copyright 2013-2015 Software Radio Systems Limited** \section LICENSE** This file is part of the srsUE library.** srsUE is free software: you can redistribute it and/or modify* it under the terms of the GNU Affero General Public License as* published by the Free Software Foundation, either version 3 of* the License, or (at your option) any later version.** srsUE is distributed in the hope that it will be useful,* but WITHOUT ANY WARRANTY; without even the implied warranty of* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the* GNU Affero General Public License for more details.** A copy of the GNU Affero General Public License can be found in* the LICENSE file in the top-level directory of this distribution* and at http://www.gnu.org/licenses/.**/#include "srslte/common/gen_mch_tables.h"/******************************************************************************* Key Generation*****************************************************************************/void generate_frame_table(uint8_t *table, uint8_t alloc)
{
/*uint8_t -> 012345678
to  table[...] = 3,4,5,6,7,8  -> 0345006780
*/table[1] = (alloc >> 5) & 0x01;         table[2] = (alloc >> 4) & 0x01;table[3] = (alloc >> 3) & 0x01;table[6] = (alloc >> 2) & 0x01;table[7] = (alloc >> 1) & 0x01;table[8] = (alloc >> 0) & 0x01;
}void generate_mch_table(uint8_t *table, uint32_t sf_alloc, uint8_t num_frames)
{ //mch multicase channelif(num_frames == 1){uint8_t alloc = (sf_alloc) & 0x3F; // 0x3F -> 0011 1111 for -> generate_frame_tablegenerate_frame_table(table, alloc);} else if(num_frames == 4){for(uint32_t j=0; j<4; j++){uint8_t alloc = (sf_alloc >> 6*(3-j)) & 0x3F; generate_frame_table(&table[j*10], alloc);/*sf_alloc -> 1234 4321 2345 5432 3456 6543 4567 7654  -> total 32bits\  1  /\  2  / \  3  /\  4  /sf_alloc>>18                                23 4554  table[ 1, 2, 3, 6, 7, 8] = 234554sf_alloc>>12                                32 3456table[11,12,13,16,17,18] = 323456sf_alloc>>6                                 65 4345table[21,22,23,26,27,28] = 654345sf_alloc>>0                                 67 7654table[31,32,33,36,37,38] = 677654Finally:table[...] 02340 05540 03230 04560 06540 03450 06770 06540   -> 40 uint8_t\    1    / \    2    / \    3    / \    4    /*/}}
}void generate_mcch_table(uint8_t *table, uint32_t sf_alloc)
{uint8_t alloc = (sf_alloc) & 0x3F;generate_frame_table(table, alloc);
}

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gen_mch_tables.h

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