Paging channel control method and apparatus
First Claim
1. A method of controlling the transmission of a plurality of frequency channels, each of which has a frame format of substantially the same constant frame period, with each frame comprising a transmission burst of variable duration, comprising:
- controlling the timing of transmission of the frames of each of said frequency channels such that the start of the transmission burst of one of said channels is delayed relative to the start of the transmission burst of another one of said channels.
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Abstract
In a messaging system, message traffic is transmitted on one or more traffic channels T1, T2 and the allocation of groups S1, S2 of receivers to the traffic channels T1, T2 is controlled by information transmitted on a bulletin board channel BB. A predetermined number of frames before a change in the traffic channel allocation, a countdown value is transmitted in the relevant traffic channel T1 and the countdown value is decremented in each subsequent frame. Before the countdown value reaches zero, the groups of receivers S1, S2 retune to the bulletin board channel, receive their new channel allocations and retune to the traffic channel indicated for their group.
The frame timings of the different traffic channels T1, T2 are staggered to reduce the peak power required to transmit message bursts in these channels.
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Citations
33 Claims
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1. A method of controlling the transmission of a plurality of frequency channels, each of which has a frame format of substantially the same constant frame period, with each frame comprising a transmission burst of variable duration, comprising:
controlling the timing of transmission of the frames of each of said frequency channels such that the start of the transmission burst of one of said channels is delayed relative to the start of the transmission burst of another one of said channels. - View Dependent Claims (2, 4, 18, 19)
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3. A method of controlling the transmission of a plurality of frequency channels, each of which has a frame format of substantially the same constant frame period, comprising controlling the timing of transmission of said frequency channels such that the start timing of the frames of each of said channels differs from that of the other ones of said channels, the method further comprising controlling the transmission of a control channel including a plurality of sets of channel control data each relating to a corresponding one of said plurality of channels such that said sets are transmitted sequentially and the order of starting of said frames of said frequency channels substantially corresponds to the order of transmission of said sets of said channel control data.
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5. Apparatus for controlling the transmission of a plurality of frequency channels each of which has a frame format of substantially the same constant frame period, with each frame comprising a transmission burst of variable length, comprising:
means for controlling the timing of transmission of the frames of each of said frequency channels such that the start of the transmission burst of one of said channels is delayed relative to the start of the transmission burst of another one of said channels. - View Dependent Claims (6, 8)
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7. Apparatus for controlling the transmission of a plurality of frequency channels, each of which has a frame format of substantially the same constant frame period, comprising:
means for controlling the timing of transmission of said frequency channels such that the start timing of the frames of each of said channels differs from that of the other ones of said channels, the apparatus further comprising means for controlling the transmission of a control channel including a plurality of sets of channel control data each relating to a corresponding one of said plurality of frequency channels such that said sets are transmitted sequentially and the order of starting of said frames of said frequency channels substantially corresponds to the order of transmission of said sets of said channel control data.
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9. A method of controlling the channel allocation of a receiver, comprising:
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controlling the transmission of a control channel indicating the current channel allocation of the receiver;
whereby the current channel allocation is modified from a first traffic channel to a second traffic channel;
controlling the transmission of the first traffic channel allocated to the receiver such that a channel change indication is transmitted to the receiver and the receiver is caused to receive said control channel so as to receive said indication of said modified allocation to the second traffic channel. - View Dependent Claims (10, 11, 12, 13)
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14. Apparatus for controlling the channel allocation of a receiver, comprising:
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means for controlling the transmission of a control channel indicating the current channel allocation of the receiver, whereby the current channel allocation is modified from a first traffic channel to a second traffic channel; and
means for controlling the transmission of the first traffic channel allocated to the receiver such that a channel change indication is transmitted to the receiver and the receiver is caused to receive said control channel so as to receive said indication of said modified allocation to the second traffic channel. - View Dependent Claims (15, 16, 17, 20, 21, 22, 23)
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24. A method of changing channel reception in a receiver, comprising:
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receiving a first traffic channel;
detecting in said first traffic channel a channel change indication;
receiving a control channel in response to said channel change indication;
detecting a channel indication relating to the receiver in said control channel; and
receiving a second traffic channel designated by said channel indication. - View Dependent Claims (25, 26, 27)
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28. A receiver, comprising:
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means for controlling the receiver to receive a first traffic channel;
means for detecting in said first traffic channel a channel change indication;
means for controlling the receiver to receive a control channel in response to said channel change indication;
means for detecting a channel indication relating to the receiver in said control channel; and
means for controlling the receiver to receive a second traffic channel designated by said channel indication. - View Dependent Claims (29, 30, 31, 32, 33)
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Specification