Telefonaktiebolaget Lm Ericsson (publ)

Nortel Networks Corporation

Ericsson Ab

Guoqiang Xue

Weigang Li

Xixian Chen

Miroslav Budic

Vasanta Chivukula

Brian D Troup

Martin Kendall

Ryan R Santa

Dimple Thomas

Bengt Strom

Edward Mah

Guoqiang Lu

Mark A Harris

Indranil Bob Tapadar

Eric Jerumanis

Xixlan Chen

Weihong Liu

Daryl Smith

Embodiments of a method for measurement of electromagnetic field strength at a point of interest in a coverage area of a 2-dimensional (2D) active antenna system (AAS). The 2D AAS transmits with a load factor of 100 percent. The 2D AAS sweeps a predefined range of azimuth and elevation angles, and azimuth and elevation directions which yield highest EMF at the point of interest are determined. First beamforming weights are determined based on the azimuth and elevation directions and the 2D AAS caused to apply the first beamforming weights. The 2D AAS sweeps a co-phasing angle from 0 to 360 degrees, and a co-phasing angle which yields highest EMF is determined. Second beamforming weights are determined based on azimuth and elevation directions and the co-phasing angle, and the 2D AAS caused to apply the second beamforming weights. The EMF strength at the point of interest is measured.

Method of measuring AAS EMF

A system for emulating a plurality of wireless communication channels is provided. The system includes a plurality of elevation steering devices configured to modify at least one elevation characteristic of a plurality of signals and a plurality of combiners. Each combiner is configured to combine at least two signals of the plurality of signals to output a combined signal. The plurality of combiners output a plurality of combined signals. The system includes a plurality of azimuth steering devices configured to modify at least one azimuth characteristic of the plurality of combined signals. The plurality of elevation steering devices and the plurality of azimuth steering devices emulate the plurality of wireless communication channels.

Method and apparatus for testing advanced antenna systems (AAS)

An apparatus for emulating a wireless network is provided. The apparatus includes processing circuitry configured to: generate a random number corresponding to an angle between a boresight of an antenna of a network node and a direction of a first wireless device, generate a random number corresponding to a path loss between the first wireless device and the antenna of the network node, determine network performance of the first wireless device based at least in part on the generated random number corresponding to the angle between the boresight of the antenna of the network node and the direction of the first wireless device and the generated random number corresponding to the path loss between the first wireless device and the antenna of the network node, and determine performance of the wireless network based at least in part on the determined network performance of the first wireless device.

Testing wireless networks using random wireless device locations

The present solution enables a packet switched connection to be temporarily released at the wireless terminal for supporting voice calls over a Circuit-Switched (CS) Fallback. The packet switched connection of the LTE core network retained for a pre-defined period of time during the CSFB session allowing the user to quickly switch back to the packet switched connection when the CSFB session is shorter than the predefined period or when the voice call CSFB attempt fails. This is accomplished by the introduction of a timed buffer to control the length of time the LTE core network connection and wireless context information will be retained.

Scheme of retaining LTE connection during circuit switch fall back

A method of connection setup in mobile wireless data communications systems is disclosed where the connection setup time is decreased for delay-sensitive communications sessions relative to the normal connection setup time for confidence-dependent communications sessions. This is achieved by performing some of the connection set-up steps for delay-sensitive communications sessions after successfully demodulating a smaller number of indications identifying an access terminal's desired serving resource than would be demodulated in the case of a confidence-dependent communication session prior to performing the same connection set-up steps.

Method and system for reducing connection set-up time

This invention enables determining whether a received frame is an erasure, a DTX mode frame or a CONT mode frame, using a metric m derived from the log likelihood ratio (LLR). The new metric is obtained by calculating the mean for the LLRs for a frame; a threshold T for this metric is also established. A received frame is declared a CONT frame if the CRC value indicates a successfully recovered frame, and m&#x3e;T. A received frame is a DTX frame if m&#x3c;T. Finally, a frame is declared an erasure if the CRC value indicates a failed frame, and m&#x3e;T. The mean absolute LLR may also be used for determining the transmission rate of the system. In this case, a voice frame is decoded for all rates available; the transmission rate is that which corresponds to a passed CRC and has the highest m.

Method for determination of discontinuous transmission, frame erasure, and rate

A cellular wireless communication system includes base transceiver stations and mobile stations that operate with a closed loop power control. The mobile tracking is performed based on the lock in and lock out thresholds by the base transceiver stations. A forward link power control bit is decoded from the reverse channel. An additional threshold is introduced for determining at the base transceiver station whether the decoded forward link power control bit is valid or invalid. The finger energies obtained from a finger processor formed by a RAKE receiver of the base transceiver station are compared to the additional validation threshold. The additional validation threshold is independent of the tracking thresholds and usually greater than them. The validation performance may not be affected by low signal/noise. The forward link traffic channel gain of the base transceiver station is controlled in response to the invalidity of the decoded forward power control bit. The decoding of the reverse link power control bit and the validity determination of the decoded reverse link power control bit are performed by similar methods to those of the forward link power control bit. With improved validation methods, the forward link and reverse link transmission power is more accurately controlled.

Method and apparatus of forward link and reverse link power control in a cellular wireless communication system

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Kanata, Canada

Guoqiang Xue