Method and apparatus for controlling transmissions in communications systems
In a bandwidth allocation protocol for a mobile communications network, mobile terminals report their bandwidth requirements to the network, while the network controls the amount of bandwidth that is used by the mobiles in reporting their bandwidth requirements. The mobiles indicate the total quantity of data awaiting transmission, the maximum delay time of the most urgent portion of the data and the maximum delay time of the least urgent portion. If a collision occurs between transmission by two mobiles, the mobiles wait for an interval controlled by the network before attempting another contention-based access transmission. The network periodically varies the contention-based access capacity available according to the observed usage level and/or collision rate in the previously allocated contention-based access capacity. The network analyses the forward traffic to individual mobiles and predicts the return bandwidth requirements which are likely to result from the forward traffic. The network stores associations between forward and return frequency channels, so that when a mobile receiving a forward frequency channel request return capacity, the network preferentially assigns return bandwidth to the mobile in one or more of the associated return channels.
1. A method of allocating frequency channels to a plurality of wireless transceivers, comprising:
transmitting to each of said plurality of transceivers a forward frequency channel allocation signal indicating an allocation of a forward frequency channel which that transceiver is to receive, wherein each transceiver in said plurality of transceivers is allocated a different forward frequency channel; and
transmitting to each of said plurality of transceivers, in said forward frequency channel assigned to that transceiver, a respective return channel allocation signal indicating an allocation of one or more return frequency channels in which that transceiver may transmit;
wherein, for each forward frequency channel, a set of preferred return frequency channels is stored, such that for said transceiver to which a specified one of said forward frequency channel is allocated, the allocated one or more return frequency channels is preferentially selected from said corresponding set of preferred return frequency channels.
2. A method of controlling transmission by a wireless first transceiver in a channel shared with transmission by other transceivers, comprising:
monitoring data packets transmitted to said first transceiver;
analyzing the content of the payload of said monitored data packets;
predicting, on the basis of said analyzing, a future demand for capacity in said channel by said first transceiver; and
transmitting to said first transceiver an allocation signal indicating an allocation in said channel determined according to said predicted demand, wherein said allocation is made independently from a request for allocation by said first transceiver.
3. A method as claimed in claim 2 , including detecting the content of said monitored data, wherein the demand for capacity is predicted according to said content.
4. A method as claimed in claim 2 , including generating a statistical model based on previous traffic flow to and from wireless transceivers, wherein the demand for capacity is predicted according to said statistical model.