Control signaling and dynamic channel allocation in a wireless network
First Claim
1. A method of signalling network control messages for use in a packet-switched wireless data network geographically arranged into one or more cells, each cell comprising one or more fixed base stations and a plurality of subscriber terminals arranged in a point-multipoint manner, communications between the base station and subscriber terminals in each cell being performed on a time division multiple access (TDMA) basis, the method being characterized by comprising the steps of:
- defining a signalling frame for time division duplex transmission of all data packets between the base station and subscriber terminals, wherein said data packets are Asynchronous Transfer Mode (ATM) cells;
transmitting the data packets within the defined signalling frame across a first ATM VPI/VCI pair; and
transmitting the network control messages as data packets within the defined signalling frame across a second ATM VPI/VCI pair.
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Accused Products
Abstract
A dynamic channel allocation method and system for use in a wireless network operates by monitoring at least the allocated channel allocated to a particular network node to generate one or more channel metrics relating to radio conditions on the channel. The metrics generated are Received signal power, signal to noise ratio of transmissions on the network and long-term mean square of the equaliser error used in each terminal. The generated metrics are communicated back to the cell access point or the network control server over a signalling channel, and a new frequency is allocated to the cell if it is determined from the metrics that the presently allocated channel is suffering interference. The signalling channel is preferably an ATM VPI/VCI pair, such that signalling messages are transmitted as ATM cells which can be communicated across the wireless channel using the sane signalling frame as is used for payload cells.
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Citations
12 Claims
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1. A method of signalling network control messages for use in a packet-switched wireless data network geographically arranged into one or more cells, each cell comprising one or more fixed base stations and a plurality of subscriber terminals arranged in a point-multipoint manner, communications between the base station and subscriber terminals in each cell being performed on a time division multiple access (TDMA) basis, the method being characterized by comprising the steps of:
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defining a signalling frame for time division duplex transmission of all data packets between the base station and subscriber terminals, wherein said data packets are Asynchronous Transfer Mode (ATM) cells; transmitting the data packets within the defined signalling frame across a first ATM VPI/VCI pair; and transmitting the network control messages as data packets within the defined signalling frame across a second ATM VPI/VCI pair. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for signalling network control messages for use in a packet-switched wireless data network geographically arranged into one or more cells, each cell comprising one or more fixed base stations and a plurality of subscriber terminals arranged in a point-multipoint manner, communications between the base stations and subscriber terminals in each cell being performed on a time division multiple access (TDMA) basis, the system being characterized by comprising:
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means for defining a signalling frame for time division duplex transmission of all data packets between the base station and subscriber terminals, wherein said data packets are Asynchronous Transfer Mode (ATM) cells; means for transmitting the data packets across a first ATM VPI/VCI pair; and means for transmitting the network control messages as data packets within the defined signalling frame across a second ATM VPI/VCI pair. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification