LoRaPHYKR920.cpp

00001 /**
00002  *  @file LoRaPHYKR920.cpp
00003  *
00004  *  @brief Implements LoRaPHY for Korean 920 MHz band
00005  *
00006  *  \code
00007  *   ______                              _
00008  *  / _____)             _              | |
00009  * ( (____  _____ ____ _| |_ _____  ____| |__
00010  *  \____ \| ___ |    (_   _) ___ |/ ___)  _ \
00011  *  _____) ) ____| | | || |_| ____( (___| | | |
00012  * (______/|_____)_|_|_| \__)_____)\____)_| |_|
00013  *   (C)2013 Semtech
00014  *  ___ _____ _   ___ _  _____ ___  ___  ___ ___
00015  * / __|_   _/_\ / __| |/ / __/ _ \| _ \/ __| __|
00016  * \__ \ | |/ _ \ (__| ' <| _| (_) |   / (__| _|
00017  * |___/ |_/_/ \_\___|_|\_\_| \___/|_|_\\___|___|
00018  * embedded.connectivity.solutions===============
00019  *
00020  * \endcode
00021  *
00022  *
00023  * License: Revised BSD License, see LICENSE.TXT file include in the project
00024  *
00025  * Maintainer: Miguel Luis ( Semtech ), Gregory Cristian ( Semtech ) and Daniel Jaeckle ( STACKFORCE )
00026  *
00027  * Copyright (c) 2017, Arm Limited and affiliates.
00028  * SPDX-License-Identifier: BSD-3-Clause
00029  *
00030  */
00031 
00032 #include "LoRaPHYKR920.h"
00033 #include "lora_phy_ds.h"
00034 
00035 
00036 /*!
00037  * Number of default channels
00038  */
00039 #define KR920_NUMB_DEFAULT_CHANNELS                 3
00040 
00041 /*!
00042  * Number of channels to apply for the CF list
00043  */
00044 #define KR920_NUMB_CHANNELS_CF_LIST                 5
00045 
00046 /*!
00047  * Minimal datarate that can be used by the node
00048  */
00049 #define KR920_TX_MIN_DATARATE                       DR_0
00050 
00051 /*!
00052  * Maximal datarate that can be used by the node
00053  */
00054 #define KR920_TX_MAX_DATARATE                       DR_5
00055 
00056 /*!
00057  * Minimal datarate that can be used by the node
00058  */
00059 #define KR920_RX_MIN_DATARATE                       DR_0
00060 
00061 /*!
00062  * Maximal datarate that can be used by the node
00063  */
00064 #define KR920_RX_MAX_DATARATE                       DR_5
00065 
00066 /*!
00067  * Default datarate used by the node
00068  */
00069 #define KR920_DEFAULT_DATARATE                      DR_0
00070 
00071 /*!
00072  * Minimal Rx1 receive datarate offset
00073  */
00074 #define KR920_MIN_RX1_DR_OFFSET                     0
00075 
00076 /*!
00077  * Maximal Rx1 receive datarate offset
00078  */
00079 #define KR920_MAX_RX1_DR_OFFSET                     5
00080 
00081 /*!
00082  * Default Rx1 receive datarate offset
00083  */
00084 #define KR920_DEFAULT_RX1_DR_OFFSET                 0
00085 
00086 /*!
00087  * Minimal Tx output power that can be used by the node
00088  */
00089 #define KR920_MIN_TX_POWER                          TX_POWER_7
00090 
00091 /*!
00092  * Maximal Tx output power that can be used by the node
00093  */
00094 #define KR920_MAX_TX_POWER                          TX_POWER_0
00095 
00096 /*!
00097  * Default Tx output power used by the node
00098  */
00099 #define KR920_DEFAULT_TX_POWER                      TX_POWER_0
00100 
00101 /*!
00102  * Default Max EIRP for frequency 920.9 MHz - 921.9 MHz
00103  */
00104 #define KR920_DEFAULT_MAX_EIRP_LOW                  10.0f
00105 
00106 /*!
00107  * Default Max EIRP for frequency 922.1 MHz - 923.3 MHz
00108  */
00109 #define KR920_DEFAULT_MAX_EIRP_HIGH                 14.0f
00110 
00111 /*!
00112  * Default antenna gain
00113  */
00114 #define KR920_DEFAULT_ANTENNA_GAIN                  2.15f
00115 
00116 /*!
00117  * ADR Ack limit
00118  */
00119 #define KR920_ADR_ACK_LIMIT                         64
00120 
00121 /*!
00122  * ADR Ack delay
00123  */
00124 #define KR920_ADR_ACK_DELAY                         32
00125 
00126 /*!
00127  * Enabled or disabled the duty cycle
00128  */
00129 #define KR920_DUTY_CYCLE_ENABLED                    0
00130 
00131 /*!
00132  * Maximum RX window duration
00133  */
00134 #define KR920_MAX_RX_WINDOW                         4000
00135 
00136 /*!
00137  * Receive delay 1
00138  */
00139 #define KR920_RECEIVE_DELAY1                        1000
00140 
00141 /*!
00142  * Receive delay 2
00143  */
00144 #define KR920_RECEIVE_DELAY2                        2000
00145 
00146 /*!
00147  * Join accept delay 1
00148  */
00149 #define KR920_JOIN_ACCEPT_DELAY1                    5000
00150 
00151 /*!
00152  * Join accept delay 2
00153  */
00154 #define KR920_JOIN_ACCEPT_DELAY2                    6000
00155 
00156 /*!
00157  * Maximum frame counter gap
00158  */
00159 #define KR920_MAX_FCNT_GAP                          16384
00160 
00161 /*!
00162  * Ack timeout
00163  */
00164 #define KR920_ACKTIMEOUT                            2000
00165 
00166 /*!
00167  * Random ack timeout limits
00168  */
00169 #define KR920_ACK_TIMEOUT_RND                       1000
00170 
00171 #if ( KR920_DEFAULT_DATARATE > DR_5 )
00172 #error "A default DR higher than DR_5 may lead to connectivity loss."
00173 #endif
00174 
00175 /*!
00176  * Second reception window channel frequency definition.
00177  */
00178 #define KR920_RX_WND_2_FREQ                         921900000
00179 
00180 /*!
00181  * Second reception window channel datarate definition.
00182  */
00183 #define KR920_RX_WND_2_DR                           DR_0
00184 
00185 /*!
00186  * Band 0 definition
00187  * { DutyCycle, TxMaxPower, LastJoinTxDoneTime, LastTxDoneTime, TimeOff }
00188  */
00189 static const band_t  KR920_BAND0  = { 1 , KR920_MAX_TX_POWER, 0, 0, 0 }; //  100.0 %
00190 
00191 /*!
00192  * LoRaMac default channel 1
00193  * Channel = { Frequency [Hz], RX1 Frequency [Hz], { ( ( DrMax << 4 ) | DrMin ) }, Band }
00194  */
00195 static const channel_params_t  KR920_LC1  = { 922100000, 0, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 };
00196 
00197 /*!
00198  * LoRaMac default channel 2
00199  * Channel = { Frequency [Hz], RX1 Frequency [Hz], { ( ( DrMax << 4 ) | DrMin ) }, Band }
00200  */
00201 static const channel_params_t  KR920_LC2  = { 922300000, 0, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 };
00202 
00203 /*!
00204  * LoRaMac default channel 3
00205  * Channel = { Frequency [Hz], RX1 Frequency [Hz], { ( ( DrMax << 4 ) | DrMin ) }, Band }
00206  */
00207 static const channel_params_t  KR920_LC3  = { 922500000, 0, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 };
00208 
00209 /*!
00210  * LoRaMac channels which are allowed for the join procedure
00211  */
00212 #define KR920_JOIN_CHANNELS                         ( uint16_t )( LC( 1 ) | LC( 2 ) | LC( 3 ) )
00213 
00214 /*!
00215  * RSSI threshold for a free channel [dBm]
00216  */
00217 #define KR920_RSSI_FREE_TH                          -65
00218 
00219 /*!
00220  * Specifies the time the node performs a carrier sense
00221  */
00222 #define KR920_CARRIER_SENSE_TIME                    6
00223 
00224 /*!
00225  * Data rates table definition
00226  */
00227 static const uint8_t datarates_KR920 []  = { 12, 11, 10,  9,  8,  7 };
00228 
00229 /*!
00230  * Bandwidths table definition in Hz
00231  */
00232 static const uint32_t bandwidths_KR920 [] = { 125000, 125000, 125000, 125000, 125000, 125000 };
00233 
00234 /*!
00235  * Maximum payload with respect to the datarate index. Can operate with and without a repeater.
00236  */
00237 static const uint8_t max_payloads_KR920 [] = { 51, 51, 51, 115, 242, 242 };
00238 
00239 /*!
00240  * Maximum payload with respect to the datarate index. Can operate with repeater.
00241  */
00242 static const uint8_t max_payloads_with_repeater_KR920 [] = { 51, 51, 51, 115, 222, 222 };
00243 
00244 LoRaPHYKR920::LoRaPHYKR920(LoRaWANTimeHandler &lora_time)
00245     : LoRaPHY(lora_time)
00246 {
00247     bands[0] = KR920_BAND0 ;
00248 
00249     // Channels
00250     channels[0] = KR920_LC1 ;
00251     channels[1] = KR920_LC2 ;
00252     channels[2] = KR920_LC3 ;
00253 
00254     // Initialize the channels default mask
00255     default_channel_mask[0] = LC( 1 ) + LC( 2 ) + LC( 3 );
00256     // Update the channels mask
00257     copy_channel_mask(channel_mask, default_channel_mask, KR920_CHANNEL_MASK_SIZE);
00258 
00259     // set default channels
00260     phy_params.channels.channel_list = channels;
00261     phy_params.channels.channel_list_size = KR920_MAX_NB_CHANNELS;
00262     phy_params.channels.mask = channel_mask;
00263     phy_params.channels.default_mask = default_channel_mask;
00264     phy_params.channels.mask_size = KR920_CHANNEL_MASK_SIZE;
00265 
00266     // set bands for KR920 spectrum
00267     phy_params.bands.table = (void *) bands;
00268     phy_params.bands.size = KR920_MAX_NB_BANDS;
00269 
00270     // set bandwidths available in KR920 spectrum
00271     phy_params.bandwidths.table = (void *) bandwidths_KR920 ;
00272     phy_params.bandwidths.size = 6;
00273 
00274     // set data rates available in KR920 spectrum
00275     phy_params.datarates.table = (void *) datarates_KR920 ;
00276     phy_params.datarates.size = 6;
00277 
00278     // set payload sizes with respect to data rates
00279     phy_params.payloads.table = (void *) max_payloads_KR920 ;
00280     phy_params.payloads.size = 6;
00281     phy_params.payloads_with_repeater.table = (void *) max_payloads_with_repeater_KR920 ;
00282     phy_params.payloads_with_repeater.size = 6;
00283 
00284     // dwell time setting
00285     phy_params.ul_dwell_time_setting = 0;
00286     phy_params.dl_dwell_time_setting = 0;
00287 
00288     // set initial and default parameters
00289     phy_params.duty_cycle_enabled = KR920_DUTY_CYCLE_ENABLED;
00290     phy_params.accept_tx_param_setup_req = false;
00291     phy_params.fsk_supported = false;
00292     phy_params.cflist_supported = true;
00293     phy_params.dl_channel_req_supported = true;
00294     phy_params.custom_channelplans_supported = true;
00295     phy_params.default_channel_cnt = KR920_NUMB_DEFAULT_CHANNELS;
00296     phy_params.max_channel_cnt = KR920_MAX_NB_CHANNELS;
00297     phy_params.cflist_channel_cnt = KR920_NUMB_CHANNELS_CF_LIST;
00298     phy_params.min_tx_datarate = KR920_TX_MIN_DATARATE;
00299     phy_params.max_tx_datarate = KR920_TX_MAX_DATARATE;
00300     phy_params.min_rx_datarate = KR920_RX_MIN_DATARATE;
00301     phy_params.max_rx_datarate = KR920_RX_MAX_DATARATE;
00302     phy_params.default_datarate = KR920_DEFAULT_DATARATE;
00303     phy_params.default_max_datarate = KR920_TX_MAX_DATARATE;
00304     phy_params.min_rx1_dr_offset = KR920_MIN_RX1_DR_OFFSET;
00305     phy_params.max_rx1_dr_offset = KR920_MAX_RX1_DR_OFFSET;
00306     phy_params.default_rx1_dr_offset = KR920_DEFAULT_RX1_DR_OFFSET;
00307     phy_params.min_tx_power = KR920_MIN_TX_POWER;
00308     phy_params.max_tx_power = KR920_MAX_TX_POWER;
00309     phy_params.default_tx_power = KR920_DEFAULT_TX_POWER;
00310     phy_params.default_max_eirp = KR920_DEFAULT_MAX_EIRP_HIGH;
00311     phy_params.default_antenna_gain = KR920_DEFAULT_ANTENNA_GAIN;
00312     phy_params.adr_ack_limit = KR920_ADR_ACK_LIMIT;
00313     phy_params.adr_ack_delay = KR920_ADR_ACK_DELAY;
00314     phy_params.max_rx_window = KR920_MAX_RX_WINDOW;
00315     phy_params.recv_delay1 = KR920_RECEIVE_DELAY1;
00316     phy_params.recv_delay2 = KR920_RECEIVE_DELAY2;
00317     phy_params.join_channel_mask = KR920_JOIN_CHANNELS;
00318     phy_params.join_accept_delay1 = KR920_JOIN_ACCEPT_DELAY1;
00319     phy_params.join_accept_delay2 = KR920_JOIN_ACCEPT_DELAY2;
00320     phy_params.max_fcnt_gap = KR920_MAX_FCNT_GAP;
00321     phy_params.ack_timeout = KR920_ACKTIMEOUT;
00322     phy_params.ack_timeout_rnd = KR920_ACK_TIMEOUT_RND;
00323     phy_params.rx_window2_datarate = KR920_RX_WND_2_DR;
00324     phy_params.rx_window2_frequency = KR920_RX_WND_2_FREQ;
00325 }
00326 
00327 LoRaPHYKR920::~LoRaPHYKR920()
00328 {
00329 }
00330 
00331 int8_t LoRaPHYKR920::get_max_eirp(uint32_t freq)
00332 {
00333     if (freq >= 922100000) {// Limit to 14dBm
00334         return KR920_DEFAULT_MAX_EIRP_HIGH;
00335     }
00336 
00337     // Limit to 10dBm
00338     return KR920_DEFAULT_MAX_EIRP_LOW;
00339 }
00340 
00341 
00342 bool LoRaPHYKR920::verify_frequency(uint32_t freq)
00343 {
00344     uint32_t tmp_freq = freq;
00345 
00346     _radio->lock();
00347 
00348     if (_radio->check_rf_frequency(tmp_freq) == false) {
00349         _radio->unlock();
00350         return false;
00351     }
00352 
00353     _radio->unlock();
00354 
00355     // Verify if the frequency is valid. The frequency must be in a specified
00356     // range and can be set to specific values.
00357     if ((tmp_freq >= 920900000) && (tmp_freq <=923300000)) {
00358         // Range ok, check for specific value
00359         tmp_freq -= 920900000;
00360         if ((tmp_freq % 200000) == 0) {
00361             return true;
00362         }
00363     }
00364 
00365     return false;
00366 }
00367 
00368 bool LoRaPHYKR920::tx_config(tx_config_params_t* config, int8_t* tx_power,
00369                              lorawan_time_t* tx_toa)
00370 {
00371     int8_t phy_dr = datarates_KR920 [config->datarate];
00372 
00373     if (config->tx_power > bands[channels[config->channel].band].max_tx_pwr) {
00374         config->tx_power = bands[channels[config->channel].band].max_tx_pwr;
00375     }
00376 
00377     uint32_t bandwidth = get_bandwidth(config->datarate);
00378     float max_eirp = get_max_eirp(channels[config->channel].frequency);
00379     int8_t phy_tx_power = 0;
00380 
00381     // Take the minimum between the max_eirp and txConfig->MaxEirp.
00382     // The value of txConfig->MaxEirp could have changed during runtime, e.g. due to a MAC command.
00383     max_eirp = MIN(config->max_eirp, max_eirp);
00384 
00385     // Calculate physical TX power
00386     phy_tx_power = compute_tx_power(config->tx_power, max_eirp, config->antenna_gain);
00387 
00388     // Setup the radio frequency
00389     _radio->lock();
00390 
00391     _radio->set_channel(channels[config->channel].frequency);
00392 
00393     _radio->set_tx_config(MODEM_LORA, phy_tx_power, 0, bandwidth, phy_dr, 1, 8,
00394                           false, true, 0, 0, false, 3000 );
00395 
00396     // Setup maximum payload lenght of the radio driver
00397     _radio->set_max_payload_length(MODEM_LORA, config->pkt_len);
00398     // Get the time-on-air of the next tx frame
00399     *tx_toa =_radio->time_on_air(MODEM_LORA, config->pkt_len);
00400 
00401     _radio->unlock();
00402 
00403     *tx_power = config->tx_power;
00404     return true;
00405 }
00406 
00407 bool LoRaPHYKR920::set_next_channel(channel_selection_params_t* params,
00408                                     uint8_t* channel, lorawan_time_t* time,
00409                                     lorawan_time_t* aggregate_timeoff)
00410 {
00411     uint8_t next_channel_idx = 0;
00412     uint8_t nb_enabled_channels = 0;
00413     uint8_t delay_tx = 0;
00414     uint8_t enabled_channels[KR920_MAX_NB_CHANNELS] = {0};
00415     lorawan_time_t nextTxDelay = 0;
00416 
00417     if (num_active_channels(channel_mask, 0, 1) == 0) {
00418         // Reactivate default channels
00419         channel_mask[0] |= LC(1) + LC(2) + LC(3);
00420     }
00421 
00422     if (params->aggregate_timeoff <= _lora_time.get_elapsed_time(params->last_aggregate_tx_time)) {
00423         // Reset Aggregated time off
00424         *aggregate_timeoff = 0;
00425 
00426         // Update bands Time OFF
00427         nextTxDelay = update_band_timeoff(params->joined, params->dc_enabled,
00428                                           bands, KR920_MAX_NB_BANDS);
00429 
00430         // Search how many channels are enabled
00431         nb_enabled_channels = enabled_channel_count(params->joined, params->current_datarate,
00432                                                      channel_mask,
00433                                                      enabled_channels, &delay_tx);
00434     } else {
00435         delay_tx++;
00436         nextTxDelay = params->aggregate_timeoff - _lora_time.get_elapsed_time(params->last_aggregate_tx_time);
00437     }
00438 
00439     if (nb_enabled_channels > 0) {
00440 
00441         for (uint8_t  i = 0, j = get_random(0, nb_enabled_channels - 1);
00442                       i < KR920_MAX_NB_CHANNELS; i++) {
00443             next_channel_idx = enabled_channels[j];
00444             j = ( j + 1 ) % nb_enabled_channels;
00445 
00446             // Perform carrier sense for KR920_CARRIER_SENSE_TIME
00447             // If the channel is free, we can stop the LBT mechanism
00448             _radio->lock();
00449 
00450             if (_radio->perform_carrier_sense(MODEM_LORA,
00451                                               channels[next_channel_idx].frequency,
00452                                               KR920_RSSI_FREE_TH,
00453                                               KR920_CARRIER_SENSE_TIME ) == true) {
00454                 // Free channel found
00455                 *channel = next_channel_idx;
00456                 *time = 0;
00457                 _radio->unlock();
00458                 return true;
00459             }
00460 
00461             _radio->unlock();
00462         }
00463 
00464         return false;
00465 
00466     } else {
00467 
00468         if (delay_tx > 0) {
00469             // Delay transmission due to AggregatedTimeOff or to a band time off
00470             *time = nextTxDelay;
00471             return true;
00472         }
00473 
00474         // Datarate not supported by any channel, restore defaults
00475         channel_mask[0] |= LC(1) + LC(2) + LC(3);
00476         *time = 0;
00477         return false;
00478     }
00479 }
00480 
00481 void LoRaPHYKR920::set_tx_cont_mode(cw_mode_params_t * params, uint32_t given_frequency)
00482 {
00483     (void)given_frequency;
00484 
00485     if (params->tx_power  > bands[channels[params->channel ].band].max_tx_pwr) {
00486         params->tx_power  = bands[channels[params->channel ].band].max_tx_pwr;
00487     }
00488 
00489     float max_eirp = get_max_eirp(channels[params->channel ].frequency);
00490     int8_t phy_tx_power = 0;
00491     uint32_t frequency = channels[params->channel ].frequency;
00492 
00493     // Take the minimum between the max_eirp and params->max_eirp.
00494     // The value of params->max_eirp could have changed during runtime,
00495     // e.g. due to a MAC command.
00496     max_eirp = MIN (params->max_eirp , max_eirp);
00497 
00498     // Calculate physical TX power
00499     phy_tx_power = compute_tx_power(params->tx_power , max_eirp, params->antenna_gain );
00500 
00501     _radio->lock();
00502     _radio->set_tx_continuous_wave(frequency, phy_tx_power, params->timeout );
00503     _radio->unlock();
00504 }
00505