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Patent Review

Skip to - Cellular System Evolution | US Patent Abstract | Invention Disclosed Summary | Topology

Introduction

The deployment of cellular radio system has relied upon the use of radio spectrum in the UHF (300-3000 MHz) or directional radio frequencies to convey bidirectional information between fixed and ambulatory transmitters and receivers. Other directional radio bands SHF (3000-30000MHz) and above are now being developed for the deployment of advanced radio services for even higher speed broadband networks. To deliver 4G or packet based cellular broadband data requires particular types of equipment and deployment which organises the infrastructure to facilitate the reuse of the spectrum available in any area so as to provide broadband over wireless services in urban and suburban environments.

The efficient use of spectrum, whilst complying with the community amenity requirements, has led to a single way to deploy facilities and equipment in any given area in order to deliver radio based broadband data. The determinants governing the capacity and efficiency of bits/Hz over a given area for deployment of such a network are the tower heights, cell radius, system value, data rate, modulation type and spectrum reuse ratio.

The MICRO WAVE CELLULAR ARCHITECTURE discloses an invention to deliver a radio based broadband network for an area which provides improved capacity of the information (broadband data) delivered in an area and also improves the effective coverage possible as an alternative to building a single very high central tower to service the same area. The tower height of one central tower antenna has been reduced to deal with community impact and to facilitate better coverage by the introduction of multiple lower towers and uses interconnected smaller coverage cells to provide both coverage and reuse of the spectrum in any given area providing a higher coverage ratio and better spectrum efficiency to construct a cellular wireless broadband network.

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The invention discloses the use of cell reuse and splitting to effect size reduction along with isolation improvements to provide a network broadband data capacity solution when using directional radio frequency based equipment. The network disclosed describes the deployment of this geometric structure and its use and this applies to all spectrum based services that can be constructed using directed frequencies.

The Patent sets out this invention and provides examples of the use of direction frequencies deployed in a cellular structure to lower tower heights and improve spectrum information capacity in an area.

The use and construction of cellular services that deliver broadband digital or analogue services is thus set out in patent P 1-2000-000443 (Philippines) and US 7403500 B2 (USA).

This method of cellular radio deployment is fundamental to construction of any area based radio communication system that relies on the use of directional radio services to deliver data capacity with community amenity to environmental impact and lower average radiation energy.

FIG. 2 is a schematic view of a plurality of cells disclosed forming a broadband Network according to the second aspect of the invention.

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Cellular System Evolution

The development of 4G and then 5G high capacity packet digital network cellular based systems provides service quality according to distance from transmitters in dense urban and suburban areas. Data rates in rural areas are lower than those enjoyed in dense urban areas due to the lower reuse of spectrum and the increased number of cells to cover any given area to deal with obstruction loss as described. In the most case 5G coverage extends to urban areas and 4G systems are utilised beyond them. Cell sizes and reuse impact the bits/Hz per area delivered.

The 4G and 5G cell radius will, in general, is smaller because the propagation loss is increased by operating at higher frequencies and at higher transmission bit rates which require smaller but more numerous cells to cover a given area. The received signal level threshold for high broadband data rate needs to be higher than at lower bit rates, in order to compensate for the required higher Eb/No at higher bit rates to achieve low error rate. This means higher cell density or smaller cell radius as set out in the claims disclosed in the invention.

Greater bit rates as well as higher frequency bands also result in smaller cell size and higher re-use ratios of spectrum. A cell-size decrease by half will result in 4 times the number of transmitter sites being required to cover the same area. This is a very important consideration because deploying infrastructure to construct a high capacity broadband wireless data network incurs the greatest cost to the network providers with more cells.

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US Patent Abstract – US7403500 B2 and Philippines P 1-2000-000443

A cell (1), and a transmission network formed from a plurality thereof, for communicating information at directional radio frequencies. The cell includes a first transmitter (2) for transmitting radio frequency information in a first direction (4) to define a first reception footprint (6) substantially within the cell (1). The cell (1) also includes a second transmitter (10) for transmitting radio frequency information in a second direction (12) substantially opposed to the first direction to define a second reception footprint (13) substantially overlapping the first reception footprint (6). The first and second transmitters are disposed at or adjacent a periphery (8) of the cell (1) at positions substantially opposed to each other.

MICRO WAVE CELLULAR ARCHITECTURE

This Patent application is a continuation of application Ser. No. 09/642,119 filed on Aug. 21, 2000, Which is a continuation of International Application PCT/AU99/ 00084 filed on Feb. 1 1, 1999, Which designated the US, claims the benefit thereof and incorporates the same by reference.

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Invention Disclosed Summary

In a first aspect, the invention provides a transmission network for communicating information at directional radio frequencies, the network including:

A broadband network servicing a first area, and including a plurality of first and second transmitters, the direction of transmission of each first and second transmitter lying substantially parallel to a first geographical axis, and a broadcast network servicing a second area substantially overlaying the first area, and including a plurality of fifth and sixth transmitters, the direction of transmission of each fifth and sixth transmitter lying substantially parallel to a second geographical axis, the second axis being orthogonal to the first axis, wherein the broadband network transmits in a first frequency band, and a broadcast network transmits in a second frequency band, the first frequency band being substantially the same as the second frequency band, the transmission network further including micro-cells for covering particular areas within the transmission network not covered by the first, second, third or fourth transmitters, the micro-cells being further divided into pico-cells in which the directional transmissions are relayed at frequencies lower than those used by the first, second, third and fourth transmitters.

Cellular deployment of micros cells and picocells to provide an extended coverage for the delivery of a broadband data network over that which would be provided by a single central tower in early radio data deployments.

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Topology

As described for a network providing broadband data or an FM modulated network, half channel frequency interleaving can be used to create additional members in a frequency set. However, channel interleaving alone does not provide a sufficiently high C/I ratio. For this reason, a distance ratio of greater than three must be maintained between transmission sittings. In an FM network, like to like signals would require a distance ratio of the order of 15 times. Given relatively at urban terrain and a restriction on transmission heights of about 20 metres, buildings, terrain and foliage provide sufficient isolation due to blockage of the undesired signal. If this is not the case and a site does not have an alternative path available then micro-cell in-filling can be employed to provide a signal of suitable C/I ratio.

Transmission Network for communicating information at directional radio frequencies, said network comprising towers, transmitters, receivers, antennae and urban and suburban environments. The relationships for bits/hz efficiency in an area using various cell sizes are set out as part of the invention.

Do Broadband Cellular deployments utilise the Patent in their deployment

If you examine the deployment of various directional radio based fixed and mobile communications systems there is only one deployment method that in any area and that is as described. We have been unable to find any deployment to date of radio based cellular services delivering broadband data networks that does not rely upon the use of the described geometric cellular topology. The described invention also improves community acceptance, lower radiation levels per area and use cellular geometric deployment also improves effective coverage and data delivery efficiency in any given urban or suburban area.

If an urban or suburban radio system is constructed utilising directional radio frequencies and is utilised to provide a data broadband network then in our view it has most likely been constructed utilising the invention disclosed in the patents US7403500 B2 and Philippines 1-2000-000443.

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