Communication apparatus, communication system, communication method and integrated circuit

Abstract

A radio apparatus (102), which consumes a power in a sensor network or the like, comprises: a data communication unit (114) that is operative to perform a data communication; and a pulse interval demodulating unit (111) that is operative to detect, from the signals (11c) of a plurality of frequency channels received at the same time, a frequency channel indicated by an interval between the time points of two pulses of a wakeup signal (1R) in the frequency channel and to cause the data communication unit (114) to use the detected frequency channel to perform the data communication.

Description

technical field [0001] The present invention relates to a wireless communication method and device for selecting a channel for communication from a plurality of channels and transmitting a wake-up signal for activating a communication partner. Background technique [0002] In recent years, wireless communication systems such as RFID (Radio Frequency Identification) and wireless sensor networks that communicate small-capacity data at a low frequency (every few hundred msec to several hours) have attracted attention. In such a wireless communication system, the wireless communication device itself is small and driven by a battery, but requires a long life (several months to several years). Since most of the start-up time is reception waiting time, a wireless communication device with ultra-low power consumption is required. [0003] As a technique for reducing power consumption while waiting for reception, there is a technique of combining a power-saving wireless device for a...

AI Technical Summary

Problems solved by technology

[0009] In a wireless communication system that can use multiple channels, channel search and negotiation are required to notify each other of the channels used for data communication, and time and power consumption are required for their synchronization.

In addition, in a wireless communication system in which the frequency of data communication is very low, power consumption is required for the overhead for synchronizing the startup time with the communication partner.

Even with the wake-up wireless device described in the above-mentioned prior art that can reduce power consumption during reception waiting, since a dedicated frequency channel is provided for wake-up, frequency utilization efficiency is also reduced.

Also, since a narrow-band filter unit and a frequency converter are required for detecting a dedicated channel, there is a problem that it is difficult to reduce circuit cost and power consumption

That is to say, if a narrow-band detection is performed, a superheterodyne (superheterodyne) structure is required, and relatively power-saving, narrow-band filters, mixers, and oscillators are required, resulting in higher circuit costs. and higher power consumption

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