Low power consumption networking method of 802.15.4e wireless device that takes power based on 4-20mA loop

A networking method comprising:

• S1. receiving power at a 802.15.4e wireless device from a 4-20 mA loop;
• S2. orienting a wireless network to an ultra-low-power consumption application;
• S3. implementing, at the wireless device, unidirectional time synchronization based on the wireless network;
• S4. performing neighbor discovery based on the unidirectional time synchronization;
• and
• S5. the wireless device interacting with the wireless network,
• wherein a power detection is made before entry into a next step, and if it is determined that residual power is insufficient for completing the next step, processing is suspended and does not go to the next step until a determination is made that sufficient power is available,
• wherein in step S4, neighbor discovery comprises:
• S41. selecting a time slot as a starting point to begin monitoring time slots and channels in accordance with a message monitoring algorithm;
• S42. when a first message is monitored, recording a message type and a time taken to detect the first message, recording and estimating a value and range of a current absolute time slot number ASNcurrent based on whether the first message includes a frame count, and calculating a closest time slot T when beacon frames may appear based on the current absolute time slot number ASNcurrent and the time taken to detect the first message;
• and
• S43. the wireless transceiver module remaining in a sleeping mode until the time slot T, and then monitoring channels defined by the message monitoring algorithm in the time slot T;
• wherein, if no beacon frame is detected, excluding the time slot T as a time slot when beacon frames may appear and returning to step S2, and if a beacon frame is detected, stopping monitoring and completing neighbor discovery.

A networking method comprising:

• S1. receiving power at a 802.15.4e wireless device from a 4-20 mA loop;
• S2. orienting a wireless network to an ultra-low-power consumption application;
• S3. implementing, at the wireless device, unidirectional time synchronization based on the wireless network;
• S4. performing neighbor discovery based on the unidirectional time synchronization;
• and
• S5. the wireless device interacting with the wireless network,
• wherein a power detection is made before entry into a next step, and if it is determined that residual power is insufficient for completing the next step, processing is suspended and does not go to the next step until a determination is made that sufficient power is available,
• wherein in step S4, neighbor discovery comprises:
• selecting a time slot as a starting point to begin monitoring time slots and channels in accordance with a message monitoring algorithm;
• when a first message is monitored, recording a message type and a time taken to detect the first message, recording and estimating a value and range of a current absolute time slot number ASNcurrent based on whether the first message includes a frame count, and calculating a closest time slot T when beacon frames may appear based on the current absolute time slot number ASNcurrent and the time taken to detect the first message;
• and
• a wireless transceiver module of the wireless device remaining in a sleeping mode until the time slot T, and then monitoring channels defined by the message monitoring algorithm in the time slot T;
• wherein the closest time slot T when a beacon frame may appear is obtained by a formula:
• T−tcurrent=ASNBeacon−ASNcurrent, where tcurrent is a current time slot, ASNcurrent is a current absolute time slot number, and ASNBeacon is an absolute time slot number of the beacon frame.