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Synchronous access method, and communication device and system in frequency hopping radio communication

  • US 9,008,149 B2
  • Filed: 10/31/2013
  • Issued: 04/14/2015
  • Est. Priority Date: 10/31/2012
  • Status: Active Grant
First Claim
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1. A method for performing synchronous access between a first communication device and a second communication device in frequency hopping radio communication, which comprises the steps of:

  • configuring the first communication device to adopt N frequency hopping channels and perform frequency hopping in a predetermined frequency hopping sequence and at a predetermined frequency hopping time interval;

    sending, via the first communication device, a broadcast beacon over the N frequency hopping channels with a cycle of M times the predetermined frequency hopping time interval, wherein the broadcast beacon carrying synchronization information for synchronous access of the second communication device, and M and N are both natural numbers and are relatively prime;

    receiving, via the second communication device, the broadcast beacon over any one frequency hopping channel of the N frequency hopping channels to acquire the synchronization information, the receiving step further comprises the steps of;

    monitoring, via the second communication device, one of the frequency hopping channels of the N frequency hopping channels, and when a packet sent by the first communication device being received over the one frequency hopping channel, establishing basic synchronization with the first communication device; and

    receiving the broadcast beacon when the packet is the broadcast beacon, and when the packet is not the broadcast beacon, from a moment of receiving the packet, the second communication device monitors the one frequency hopping channel once every N of the predetermined frequency hopping time intervals until the broadcast beacon is received over the one frequency hopping channel, the second communication device is dormant before each monitoring; and

    exchanging further information, via the second communication device, with the first communication device for access.

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