Abstract: Embodiments of the present invention provide a communication system, comprising: a first wireless network including a coordinator and a plurality of network devices associated with the coordinator; a second wireless network; wherein the first coordinator is arranged to notify at least one network device of the availability of data; and the at least one network device notified of the availability of data is arranged to associate with the second wireless network and to receive the data.

Abstract: Embodiments of the present invention provide a current mode logic circuit, comprising first and second differential switching stages, each stage arranged being arranged to receive a plurality of clock signals, such that the first and second differential switching stages respond to a combination of the plurality of clock signals.

Abstract: Embodiments of the present invention provide a method of determining a propagation delay of wireless communications between wireless network devices, comprising exchanging first and second messages with a wireless network device; determining first time information based upon the exchange of the first and second messages; receiving second time information from the wireless network device, the second time information based upon the exchange of the first and second messages; and determining a propagation delay based upon the first and second time information.

Abstract: Embodiments of the present invention provide a method of reducing power consumption in a wireless network device, comprising determining a duration prior to a beacon being received by the device; comparing the duration against a predetermined value; and adjusting a duration of a sleep period in response to the comparison.

Abstract: Certain embodiments of the invention relate to a method and system for managing routing in a wireless network, the method comprising receiving an indication that a route to a first node via a routing node is invalid; and deleting, from routing information, information indicating the route to the first node via the routing node. Other embodiments of the invention relate to a method and system for managing routing in a wireless network, the method comprising receiving a message from a descendant node via a routing node; determining whether routing information indicates a route to the descendant node via the routing node; if the routing information does not indicate the route, adding information to the routing information indicating the route to the descendant node via the routing node; and forwarding the message to a destination node.

Abstract: Apparatus for determining a location of a peak in correlation output samples, the apparatus being arranged to receive samples from at least one correlator over a plurality of symbol time periods; combine samples from a period that is longer than the symbol time period into combined samples; and determine the position of a peak in the combined samples.

Abstract: A comparator, comprising at least one current stage for providing a first current proportional to a difference between first and second comparator inputs, the first current being provided to an amplifier input; an amplifier for amplifying a current provided to the amplifier input and providing a comparator output; apparatus for introducing hysteresis, comprising at least one of a current source and a current sink, the current source being arranged to selectively source a source current to the amplifier input such that the comparator output changes from a first state to a second state when a difference between the first and second inputs rises above a first value, and the current sink being arranged to selectively sink a sink current from the amplifier input such that the comparator output changes from the second state to the first state when the difference between the first and second inputs falls below a second value; and apparatus for controlling at least one of the source current and the sink current to be

Abstract: Embodiments of the invention comprise a method of determining a position of a node, comprising receiving a communication from the node; determining a timing of the receiving; and calculating a position of the node from the timing.

Abstract: Embodiments of the invention provide an analogue to digital converter comprising a dual differential digital to analogue converter (DAC) having first and second digital inputs for first and second digital input signals respectively, and having first and second analogue differential outputs for first and second differential output signals respectively, where the first and second digital output signals are associated with the first and second digital inputs respectively; storage for storing a DAC digital input value: logic for deriving the first and second digital input signals from the DAC digital input value, such that the difference between the first and second differential output signals from the DAC represents the DAC digital input value; a comparator for comparing the first and second differential output signals from the DAC with an analogue input signal are providing a comparator output; and a controller, responsive to the comparator output, for modifying the DAC digital input value such that the DAC dig