Alcatel Lucent

Lucent Technologies Inc.

Hai Zhou

Jung Ah Lee

Said Tatesh

Huiyu Tao

Mark Ernest Newbury

Hong Yang

Mohammad Ather Khan

Urs Peter Bernhard

Utku Azman

Andrew Zaporozhets

Monica Casado-Fernandez

Andrew Zaporopzhets

Jun Yang

Ather Khan

A method of controlling a base station, a network controller, a base station, a telecommunications network and a computer program product are disclosed. A method of controlling a base station () in a mobile telecommunications network () comprises the steps of: (i) determining whether a base station within the mobile telecommunications network is not supporting user equipment () and, if so, then (ii) signalling the base station to reduce its transmission power. An assessment is made as to whether a base station is currently supporting user equipment. If a base station is currently supporting user equipment, then that base station is unlikely to be a candidate to have its power reduced since support to that user equipment needs to be maintained. However, if a base station is not supporting user equipment, then that base station would appear to be a likely candidate for transmission power reduction, thereby saving power in the network at those locations where it is possible to do so.

Base station control

A femto cell base station and a method are disclosed. The method comprises the steps of: a) monitoring data transmission antenna weights used during wireless data transmissions over a femto cell data channel between a femto cell base station and user equipment; b) deriving broadcast channel antenna weights from the data transmission antenna weights; and c) forming the femto cell broadcast channel beam using the broadcast channel antenna weights. The femto cell broadcast channel beam is adapted to minimize interference. The femto cell broadcast channel beam may then be formed using those broadcast channel antenna weights in order to direct and restrict the size of the broadcast channel beam and reduce the likely interference caused by the femto cell to other femto cells and to a macro cell.

Femto cell base station and method

A method is provided of controlling transmission power of a picocell base station. The method comprises the steps of the picocell base station: transmitting a signal at a first power; receiving a report from a mobile terminal that the signal is received within a predetermined quality range; dependent upon receiving said report instructing the mobile terminal to report as to the number of neighboring macrocells detected by the mobile terminal; and controlling the transmission power of a further signal dependent upon said number.

Picocell power control

In a wireless telecommunications network, a Code Division Multiple Access (CDMA) scheme is applied to data to encode it. The encoded data transmitted in the uplink using an Orthogonal Frequency Division Multiplexing (OFDM) frame structure including a cyclic prefix (CP). The CDMA encoded data may be time multiplexed with Single Carrier-Frequency Division Multiple Access (SC-FDMA) transmissions. The CDMA transmissions may be used for relatively small payloads, such as those associated with voice traffic and control signals, and the SC-FDMA transmissions used for higher date rate transmissions. This enables autonomous transmission, without scheduling, for smaller payloads. A transmitter includes a selectorfor performing time multiplexing in the uplink, the required mode being indicated by the Hybrid Automatic Repeat Request (HARQ) ID. A first branchcarries SC-FDMA data and a second branchcarries data to be transmitted as a CDMA scheme. A CAZAC code may be used in encoding the CDMA data.

Method and apparatus for packet wireless telecommunications

In one embodiment of the instant invention, a non-coherent transmission method for uplink control signals is provided. The transmission methodology uses a constant amplitude zero-autocorrelation (CAZAC) sequence for relatively short control signal lengths. The methodology includes creating a CAZAC sequence, truncating the CAZAC sequence into a plurality of segments; and transmitting each of the segments within a predetermined window of time.

Non-coherent transmission method for uplink control signals using a constant amplitude zero-autocorrelation sequence

The present invention provides methods for selecting a handover algorithm. The methods may include selecting the handover algorithm for a mobile unit based on at least one measurement indicative of a network state. The methods may also include receiving information indicative of the handover algorithm selected based on the measurement(s) indicative of the network state.

Selecting a handover algorithm

The per sector or per cell downlink capacity in a spread spectrum wireless network is determined using a single test mobile that is operating within a background of simulated co-channel interference being broadcast in each sector by all cell sites in the network whose capacity is of interest. From all sectors, an Orthogonal Channel Noise Simulator (OCNS) generates a multiple number of calibrated test signals, which are aggregated and broadcast downlink, where each transmitted test signal simulates the downlink power transmitted to a live mobile. Each component test signal in the aggregated OCNS output transmitted in each sector is a sample of a stochastic process with a set mean and standard deviation that are determined from the mean and standard deviation of the power of a real signal transmitted downlink to the test mobile as it is moved around the network's coverage area. The capacity of the sector is determined by increasing the number of test signals in each aggregated OCNS output until measurable performance is compromised.

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Swindon, United Kingdom

Hai Zhou