case about NRF9160 High registered network current (test environment, no NB network signal)

Hi,

1. Please solve the problem of high network current registered to nRF9160 (test environment: no network signal)

2. Rf signal: the test current is normal. See Appendix A for the test data

3. No RF signal (shielded room) : the test current is abnormal. See appendix B for the test data

4. Tools for opening test data: see Attachment: C

5. See Attachment D for test example

/*
 * Copyright (c) 2020 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */

#include <zephyr.h>
#include <stdio.h>
#include <modem/lte_lc.h>
#include <net/socket.h>

#define UDP_IP_HEADER_SIZE 28
K_SEM_DEFINE(lte_connected, 0, 1);

#if defined(CONFIG_NRF_MODEM_LIB)
static void lte_handler(const struct lte_lc_evt *const evt)
{
	switch (evt->type) {
	case LTE_LC_EVT_NW_REG_STATUS:
		if ((evt->nw_reg_status != LTE_LC_NW_REG_REGISTERED_HOME) &&
		     (evt->nw_reg_status != LTE_LC_NW_REG_REGISTERED_ROAMING)) {
			break;
		}

		printk("Network registration status: %s\n",
			evt->nw_reg_status == LTE_LC_NW_REG_REGISTERED_HOME ?
			"Connected - home network" : "Connected - roaming\n");
		k_sem_give(&lte_connected);
		break;
	case LTE_LC_EVT_PSM_UPDATE:
		printk("PSM parameter update: TAU: %d, Active time: %d\n",
			evt->psm_cfg.tau, evt->psm_cfg.active_time);
		break;
	case LTE_LC_EVT_EDRX_UPDATE: {
		char log_buf[60];
		ssize_t len;

		len = snprintf(log_buf, sizeof(log_buf),
			       "eDRX parameter update: eDRX: %f, PTW: %f\n",
			       evt->edrx_cfg.edrx, evt->edrx_cfg.ptw);
		if (len > 0) {
			printk("%s\n", log_buf);
		}
		break;
	}
	case LTE_LC_EVT_RRC_UPDATE:
		printk("RRC mode: %s\n",
			evt->rrc_mode == LTE_LC_RRC_MODE_CONNECTED ?
			"Connected" : "Idle\n");
		break;
	case LTE_LC_EVT_CELL_UPDATE:
		printk("LTE cell changed: Cell ID: %d, Tracking area: %d\n",
		       evt->cell.id, evt->cell.tac);
		break;
	default:
		break;
	}
}

static int configure_low_power(void)
{
	int err;

#if defined(CONFIG_UDP_PSM_ENABLE)
	/** Power Saving Mode */
	err = lte_lc_psm_req(true);
	if (err) {
		printk("lte_lc_psm_req, error: %d\n", err);
	}
#else
	err = lte_lc_psm_req(false);
	if (err) {
		printk("lte_lc_psm_req, error: %d\n", err);
	}
#endif

#if defined(CONFIG_UDP_EDRX_ENABLE)
	/** enhanced Discontinuous Reception */
	err = lte_lc_edrx_req(true);
	if (err) {
		printk("lte_lc_edrx_req, error: %d\n", err);
	}
#else
	err = lte_lc_edrx_req(false);
	if (err) {
		printk("lte_lc_edrx_req, error: %d\n", err);
	}
#endif

#if defined(CONFIG_UDP_RAI_ENABLE)
	/** Release Assistance Indication  */
	err = lte_lc_rai_req(true);
	if (err) {
		printk("lte_lc_rai_req, error: %d\n", err);
	}
#endif

	return err;
}

static void modem_init(void)
{
	int err;

	if (IS_ENABLED(CONFIG_LTE_AUTO_INIT_AND_CONNECT)) {
		/* Do nothing, modem is already configured and LTE connected. */
	} else {
		err = lte_lc_init();
		if (err) {
			printk("Modem initialization failed, error: %d\n", err);
			return;
		}
	}
}

static void modem_connect(void)
{
	int err;

	if (IS_ENABLED(CONFIG_LTE_AUTO_INIT_AND_CONNECT)) {
		/* Do nothing, modem is already configured and LTE connected. */
	} else {
		err = lte_lc_connect_async(lte_handler);
		if (err) {
			printk("Connecting to LTE network failed, error: %d\n",
			       err);
			return;
		}
	}
}

static void modem_disconnect(void)
{
	int err;

	if (!IS_ENABLED(CONFIG_LTE_AUTO_INIT_AND_CONNECT)) {
		/* Do nothing, modem is already configured and LTE connected. */
	} else {
		err = lte_lc_deinit();
		if (err) {
			printk("Connecting to LTE network failed, error: %d\n",
			       err);
			return;
		}
	}
}

#endif

void main(void)
{
	int err;

	printk("UDP sample has started\n");

	//work_init();

#if defined(CONFIG_NRF_MODEM_LIB)

	/* Initialize the modem before calling configure_low_power(). This is
	 * because the enabling of RAI is dependent on the
	 * configured network mode which is set during modem initialization.
	 */
	//modem_init();

	//err = configure_low_power();
	//if (err) {
	//	printk("Unable to set low power configuration, error: %d\n",
	//	       err);
	//}
        k_sleep( Z_TIMEOUT_MS(5000) );
	//modem_connect();

	//k_sem_take(&lte_connected, K_FOREVER);
#endif

        while(1)
        {
            lte_lc_init();
            lte_lc_connect();
            k_sleep( Z_TIMEOUT_MS(180000) );
            
            lte_lc_offline();
            lte_lc_deinit();
            k_sleep( Z_TIMEOUT_MS(180000) );
        }
}

6. Test DK: PCA10090 0.9.0 2019.21

7. Test SDK: NCS V1.9.1

8.The attachment

Thank you for all your assistance.
Kind regards,
Peter.Min