Multiplex communications – Fault recovery – Bypass an inoperative channel
Reexamination Certificate
1998-07-17
2001-12-25
Ngo, Ricky (Department: 2664)
Multiplex communications
Fault recovery
Bypass an inoperative channel
C370S330000, C370S337000, C370S442000
Reexamination Certificate
active
06333916
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a wireless communication system, apparatus, and method to communicate using a plurality of communication slots in time division multiple access technique.
In conventional time division multiple access communication in a wired network using an ISDN network, a communication apparatus can perform communication using two communication slots (e.g., B
1
and B
2
channels).
However, in time division multiple access communication using radio channels, such as a personal handyphone system (PHS) and a personal digital cellular (PDC), when a communication apparatus communicates with another communication apparatus, the communication is performed using only one of a plurality of communication slots of a communication frame. Communication using two or more communication slots has not been performed.
Thus, in the conventional wireless time division multiple access communication, communication is performed using only one communication slot; accordingly, communications traffic between two radio communication apparatuses is limited to the channel capacitance of one communication slot (e.g., 32 kbps in PHS). Therefore, the conventional radio communication apparatus is not suitable for transmitting non-audio data, for instance, which is more frequently transmitted than before.
Further, if communication using two or more communication slots in time division multiple access technique via radio channels is tried, difficulties occur, since wireless communication is easily interfered by, e.g., other wireless communication and electromagnetic wave generated by electrical appliance, compared to wired communication. Therefore, when wireless communication is performed using, e.g., two communication slots, either or both of the channels would be interfered frequently, which may interrupt the communication.
SUMMARY OF THE INVENTION
The present invention has been made in consideration of the above situation, and has as its object to keep the same or similar communications traffic via a plurality of communication slots even after troubles occur and one or more of the communication slots become useless while communicating between radio communication apparatuses.
It is another object of the present invention to prevent a drop of communications traffic or keep a drop of communications traffic as low as possible, at least, when a radio channel of a communication slot is deteriorated.
Further, it is another object of the present invention to maintain a current wireless link and provide information for executing an application suitable for the status of a channel by informing the application of the status of communications traffic due to a decrease in the number of available communication slots when a decrease of communications traffic can not be avoid.
Other features and advantages of the present invention will be apparent from the following description taken in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof.
REFERENCES:
patent: 5844894 (1998-12-01), Dent
patent: 5862130 (1999-01-01), Tat et al.
patent: 5937002 (1999-08-01), Andersson et al.
patent: 8570391 (1999-02-01), Nago
Hamada Masashi
Watanabe Mitsuhiro
Canon Kabushiki Kaisha
Morgan & Finnegan , LLP
Ngo Ricky
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