Airspan Networks Inc.

Dsc Communications Corporation

Alcatel USA Sourcing, L.p.

Airspan Communications Corporation

Ian L Cooper

Martin Lysejko

Joemanne Chi Cheung Yeung

Jonathan A Thompson

Guy A Cooper

Joemmane Chi Yeung

Shashikant Bhagalia

Andrew M Walding

Tarlochan S Gohlar

A wireless telecommunications systems (,) includes a central terminal (,) for transmitting and receiving radio frequency signals to and from a subscriber terminal (,). A downlink communication path is established from a transmitter (,) of the central terminal (,) to a receiver (,) of the subscriber terminal (,). A downlink signal (,) is transmitter from the transmitter (,) to the receiver (,) during setup and operation of the wireless telecommunications system (,). The receiver (,) of the subscriber terminal (,) compares a code and phase of a master code sequence in the downlink signal (,) to a code and phase of a slave code sequence of the receiver (,). The receiver (,) adjusts the phase of the slave code sequence until a match is obtained with the master code sequence. The downlink signal (,) includes an overhead channel (,) having a power control signal (,), a code synchronization signal (,), and a frame alignment signal (,). The power control signal (,) is capable of adjusting a transmitting power of a transmitter (,) in the subscriber terminal (,). The code synchronization signal (,) is capable of adjusting a phase of a transmitter (,) in the subscriber terminal (,). A receiver (,) in the central terminal (,) monitors an uplink signal (,) transmitted by the transmitter (,) in the subscriber terminal and provides changes to the code synchronization signal (,) such that the transmitter (,) is synchronized to the receiver (,). The receiver (,) monitors the downlink signal (,) to identify the frame alignment signal (,) and establishes the downlink communication path when two successive frame alignment signals (,) are identified. The wireless telecommunications system (,) operates in one of three operating modes. In an acquisition mode during establishment of the downlink communication path, the downlink signal (,) is transmitted at a high power level and a low transmit rate with the receiver (,) operating at the low transmit rate. In a standby mode after establishment of the downlink communication path, the downlink signal (,) is transmitted at a low power level and a low transmit rate with the receiver (,) operating at the low transmit rate. In a traffic mode upon a request for wireless communication transmission, the downlink signal (,) is transmitted at a high power level and a high transmit rate with the receiver (,) adjusting to operate at the high transmit rate. Upon completion of the wireless communication transmission, the wireless telecommunications system (,) returns to the standby mode and the receiver (,) adjusts to operate at the low transmit rate.

Apparatus and method of controlling transmitting power in a subscriber of a wireless telecommunications system

The present invention provides a subscriber terminal for communicating over a wireless link with a central terminal of a wireless telecommunications system, the subscriber terminal comprising a first signal processing unit associated with an antenna to transmit and receive signals over the wireless link at first frequencies within an operating frequency band. The first signal processing unit comprises a frequency converter for converting signals between said first frequencies and a second frequency. Further, a second signal processing unit is provided remote from the first signal processing unit and associated with an item of telecommunications equipment to pass signals between said item of telecommunications equipment and the first signal processing unit. The second signal processing unit is formed from signal processing circuitry which is independent of the operating frequency band, the signals being passed between the first signal processing unit and the second signal processing unit at the second frequency via a connection medium connecting the first and second signal processing units. Given this approach, the second signal processing unit can then be formed from signal processing circuitry which is independent of the operating frequency band.

Subscriber terminal and method for passing control signals between a first and second signal processing units

The present invention provides a system for handling telecommunications signals passed between a first and second element of a telecommunications network, the first element having an interface for transmitting and receiving signals in a first protocol, and the second element having an interface for transmitting and receiving signals in a second protocol. The system of the present invention comprises a first interface unit for receiving a first telecommunications signal transmitted in one of said first and second protocols between said first and second elements, the first interface unit being arranged to separate traffic bearing channels from non-traffic bearing channels within the first telecommunications signal. A traffic management element is then provided for performing a cross-connection function to map the traffic bearing channels to the appropriate format for the other of said protocols, whilst a protocol conversion element is provided for performing predetermined protocol conversion steps on the non-traffic bearing channels in order to regenerate those non-traffic bearing channels in the other of said protocols. Further, a second interface unit is provided for combining the channels as output by the traffic management element and the protocol conversion element in order to create a second telecommunications signal in the other of said protocols, the second interface unit being arranged to output the second telecommunications signal. Preferably, said first protocol has a concentrated format, and said second protocol has an unconcentrated format.

Handling of telecommunications signals passed between elements of a telecommunications network

A wireless telecommunications systems (,) includes a central terminal (,) for transmitting and receiving radio frequency signals to and from a subscriber terminal (,). A downlink communication path is established from a transmitter (,) of the central terminal (,) to a receiver (,) of the subscriber terminal (,). A downlink signal (,) is transmitted from the transmitter (,) to the receiver (,) during setup and operation of the wireless telecommunications system (,). The receiver (,) of the subscriber terminal (,) compares a code and phase of a master code sequence that includes an orthogonal code in the downlink signal (,) to a code and phase of a slave code sequence of the receiver (,). The receiver (,) adjusts the phase of the slave code sequence until a match is obtained with the master code sequence. The receiver (,) monitors the downlink signal (,) to identify the frame alignment signal (,) and establishes the downlink communication path when two successive frame alignment signals (,) are identified. A channel identifier signal within the downlink signal is identified and used to identify the orthogonal code included in the master code sequence. The channel identifier signal is matched to a reference identifier code to verify that the correct downlink signal is being read.

Apparatus and method of establishing and maintaining communication paths in a wireless telecommunications system

A wireless telecommunications system (1) includes a central terminal (10) for transmitting and receiving radio frequency signals to and from a subscriber terminal (20). A downlink communication path is established from a transmitter (200) of the central terminal (10) to a receiver (202) of the subscriber terminal (20). A downlink signal (212) is transmitted from the transmitter (200) to the receiver (202) during setup and operation of the wireless telecommunications system (1). The downlink signal (212) includes an overhead channel (224) having a code synchronization signal (234). The code synchronization signal (234) is capable of adjusting a phase of a transmitter (204) in the subscriber terminal (20). A receiver (206) in the central terminal (10) monitors an uplink signal (214) transmitted by the transmitter (204) in the subscriber terminal and provides changes to the code synchronization signal (234) such that the transmitter (204) is synchronized to the receiver (206). Synchronization of the transmitter (204) in the subscriber terminal (20) to the receiver (206) in the central terminal (10) facilitates establishment of an uplink communication path from the subscriber terminal (20) to the central terminal (10).

Apparatus and method of synchronizing a transmitter in a subscriber

A wireless telecommunications system (1) includes a central terminal (10) for transmitting and receiving radio frequency signals to and from a subscriber terminal (20). A downlink communication path is established from a transmitter (200) of the central terminal (10) to a receiver (202) of the subscriber terminal (20). A downlink signal (212) is transmitted from the transmitter (200) to the receiver (202) during setup and operation of the wireless telecommunications system (1) carrying information partitioned into a plurality of frames. The downlink signal (212) includes an overhead channel (224) having a frame alignment signal (232) for each frame of information. The receiver (202) monitors the downlink signal (212) to identify the frame alignment signal (232). The downlink communication path is established when the receiver (202) identifies two successive frame alignment signals (232).

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Basingstoke, United Kingdom

Ian L Cooper