Nortel Networks Corporation

Mark Watkins

Martin Stevens Smith

Keith Russell Edwards

Graham Dolman

Julius Robson

Keith S Wilson

Ian A Abraham

Paul Murray Row

Fraser Murray Edwards

Christopher J Adams

A power supply line for powering electronic equipment from a power supply remote from the electronic equipment, having a balanced differential power transmission pathconnecting the power supplyto the electronic equipmentand at least one isolating transformerin the power supply line, for providing isolation from ground potential rise associated with lightning surge currents. The invention has particular application to a wireless communications tower having the isolated power supply line for powering masthead electronic equipment, and an isolated communications linkbetween the masthead electronic equipment and a network terminal

Lightning protection

A base station for a wireless network has multiple channels for communicating with user equipments, and has multiple channel reuse patterns. The patterns are complementary such that areas of low carrier to interference ratio C/I of one pattern are not coincident with areas of low C/I of other patterns. An allocator allocates channels such that for user equipment located in an area of low C/I of any of the complementary patterns, the allocator favors allocation of a channel of another of the complementary patterns. The sacrifice of capacity can be reduced as there is less need for a capacity-hungry high re-use factor pattern. The channels may be frequencies, time slots or CDMA codes. The reuse patterns can involve reuse on selected base stations, or on selected sectors, or different polarizations. The network can be of any type including fixed wireless access FWA, or mobile networks.

Multiple reuse patterns for channels of wireless networks

A cellular radio communication system for transmitting blocks of data over transmission links in which the quality of the transmission links are monitored. The system comprises a data storage means for storing sets of modulation scheme and forward error correction coding level pairs to give an optimum data rate at a predetermined bit error rate and a predetermined symbol rate for different quality transmission links. The database is interrogated and a modulation scheme and forward error correction coding level pair is allocated and applied to the blocks of data transmitted over a transmission link dependent on the monitored quality of the transmission link.

Cellular radio communications system

Growing community of inventors

Great Dunmow, United Kingdom

Mark Watkins