Synchronous access method, and communication device and system in frequency hopping radio communication
First Claim
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.
4 Assignments
0 Petitions
Accused Products
Abstract
A method performs synchronous access between a first communication device and a second communication device. The first communication device adopts N frequency hopping channels and performs frequency hopping in a predetermined frequency hopping sequence and at a predetermined frequency hopping time interval. The first communication device sends a broadcast beacon over the N frequency hopping channels with a cycle of M times the predetermined frequency hopping time interval. The broadcast beacon carries general information including synchronization information. M and N are both natural numbers. The second communication device receives the broadcast beacon over any one frequency hopping channel of the N frequency hopping channels to acquire the synchronization information. The second communication device exchanges information with the first communication device for access. This flexible, simple and easy-to-implement synchronous access solution achieves high-efficiency utilization and good anti-interference of a bandwidth, and allows rapid and reliable synchronization with low power consumption.
-
Citations
12 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A first communication device capable of performing synchronous access with a second communication device via frequency hopping radio communication, the first communication device adopting N frequency hopping channels and performing frequency hopping in a predetermined frequency hopping sequence and at a predetermined frequency hopping time interval, the first communication device comprising:
-
a sending unit for sending a broadcast beacon over the N frequency hopping channels with a cycle of M times the predetermined frequency hopping time interval, the broadcast beacon carrying synchronization information for the synchronous access of the second communication device, and wherein M and N are both natural numbers and are relatively prime; a receiving unit for receiving feedback information sent from the second communication device; and a dedicated channel allocation unit for allocating to the second communication device, according to the feedback information, at least one frequency hopping channel of the N frequency hopping channels as a dedicated channel dedicated for communication between the first communication device and the second communication device. - View Dependent Claims (9, 10)
-
-
11. A first communication device, capable of synchronous access with a second communication device in frequency hopping radio communication, the first communication device comprising:
-
a receiving unit for receiving a broadcast beacon over any one frequency hopping channel of the N frequency hopping channels adopted by the second communication device so as to acquire synchronization information for the synchronous access of the first communication device, a monitoring unit for monitoring one frequency hopping channel of the N frequency hopping channels; and a basic synchronization establishment unit, wherein when said receiving unit receives a packet sent by the second communication device over a monitored frequency hopping channel, said basic synchronization establishment unit establishes basic synchronization with the second communication device, and when a packet is the broadcast beacon, said receiving unit receives the broadcast beacon over the frequency hopping channel, and when the packet is not the broadcast beacon, from a moment of receiving the packet, said monitoring unit monitors the frequency hopping channel once every N of the predetermined time intervals until said receiving unit receives the broadcast beacon over the frequency hopping channel, wherein the first communication device is dormant before each monitoring. - View Dependent Claims (12)
-
Specification