Method of, and system for, transmitting data over a communications channel
First Claim
1. A communications system comprising:
- a system control terminal for controlling the operation of the system, a primary station coupled to the system control terminal, at least a first low rate data terminal, and a data link between said first low rate data terminal and said primary station;
said data link being a time slot channel assigned by the system control terminal in each of successive frames of a series of time division multiplexed time slot channels, each time slot channel being capable of data transmission at a predetermined binary rate of X bits/sec such that X≧
8;
characterized in that;
said low first rate data terminal comprises means for generating data at a rate of N bits/sec, where N is a binary submultiple of X;
means for accumulating X bits of the generated data during every successive number X/N of frames; and
means for transmitting the accumulated data in said assigned time slot channel during each X/N th frame.
1 Assignment
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Accused Products
Abstract
In a cordless communications system, such as DECT, data is transmitted to or from a data terminal in an assigned channel in each TDMA frame. In order to accommodate data terminals having lower data rates than the capacity of the channel, such a data terminal accumulates its data during several frames in a buffer store until the accumulated data corresponds to the channel capacity, and is then transmitted in the frame in which that occurs. In order to utilize such interruptions in transmission from a plurality of low rate data terminals, the system control terminal treats each successive sequence of a predetermined number of frames (FR0 to FR15) as a multiframe, and transmissions from low rate data terminals are assigned to multiplexed frames which minimize the number of unoccupied channels in each multiframe.
33 Citations
7 Claims
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1. A communications system comprising:
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a system control terminal for controlling the operation of the system, a primary station coupled to the system control terminal, at least a first low rate data terminal, and a data link between said first low rate data terminal and said primary station; said data link being a time slot channel assigned by the system control terminal in each of successive frames of a series of time division multiplexed time slot channels, each time slot channel being capable of data transmission at a predetermined binary rate of X bits/sec such that X≧
8;characterized in that; said low first rate data terminal comprises means for generating data at a rate of N bits/sec, where N is a binary submultiple of X;
means for accumulating X bits of the generated data during every successive number X/N of frames; and
means for transmitting the accumulated data in said assigned time slot channel during each X/N th frame. - View Dependent Claims (2, 3, 4)
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5. A system control terminal for use in a communications system which includes a low rate data terminal and wherein data is transmitted from said data terminal over a data link in the form of a time slot in each of successive frames of a series of time division multiplex time slots, each time slot being capable of data transmission at a predetermined binary rate of X bits/sec such that X≧
- 8, each series of a predetermined number of frames constituting a multiframe, the low rate data terminal generating data at a rate of N bits/sec, where N is a binary submultiple of X;
characterized in that said system control terminal comprises means for allocating to said data terminal a time slot in the X/N th frame of every multiframe, said allocated time slot being for transmission of data accumulated by the low rate data terminal during X/N frames of said multiframe, whereby the accumulated data is transmitted by the low rate data terminal in said allocated time slot at the time slot rate of X bits/sec. - View Dependent Claims (6, 7)
- 8, each series of a predetermined number of frames constituting a multiframe, the low rate data terminal generating data at a rate of N bits/sec, where N is a binary submultiple of X;
Specification