Siemens Information & Communication Networks, Inc.

Nokia Siemens Networks Gmbh & Co Kg

Italtel S.p.a.

Siemens Mobile Communications S.p.a.

Nokia Siemens Networks S.p.a.

Claudio Santacesaria

Giulio Cavalli

Umberto Spagnolini

Alberto Profumo

Annalisa Tomasetta

Monica Nicoli

Luigi Sampietro

Osvaldo Simeone

Gaspare Licitra

Paolo Baldo

Luigi Lovino

Mauro Brugali

External packets entering a transmitting entity of a broadband wireless access system are forwarded to a receiving entity onto MAC layer connections at the wireless interface between such entities in a manner depending on the result of a packet classification performed by using a set of classification rules identified by a rule index and associated with a priority index determining the order of application of different rules to packets relating to a same service. The classification rules include both classification rules specific for data communication protocols and containing one or more protocol-specific parameters to be matched by corresponding fields in a packet being classified, and a pass-through classification rule only containing a priority index and a rule index, but no protocol-specific matching parameter, said pass through classification rule being applied to a packet not having matched a protocol-specific classification rule.

Method for packet classification based on protocol type and on priorities

An air time management method and apparatus for multi-access channel networks is provided, suitable for use when terminal stations operate with adaptive modulation. A specific modulation (default modulation) is defined for each terminal station (in a planning phase. During operation, when bandwidth is to be allotted to an uplink or downlink communication, a base station checks whether the concerned terminal station is operating with a modulation more robust (e.g. less efficient) than the default modulation. In so, the base station allocates a time slot to the communication that has a duration sufficient for transmitting less than all of a particular set of data with the default modulation. If not, the base station allocates a time slot to the communication that has a duration sufficient for transmitting all of a particular set of data with the current modulation.

Method of and device for air time management in multi-access channel networks

A channel response matrix gathering all unknown elements for all K pilot subcarriers on links between transmitting and receiving antennas, is Least Squares (full-rank) estimated. The interference covariance matrix is estimated from the residual. The correlation of the interference covariance matrix is computed at each new symbol and compared with a threshold. If the interference is significantly changed, the interference covariance matrix is re-initialized, otherwise a running average of the interference covariance matrix is updated with the actual value. Both the updated/re-initialized interference covariance matrix and the autocorrelation matrix of the transmitted pilot sequences (stored in the receiver) are used for whitening the estimated channel matrix before submission to modal filtering for rank reduction. The original spatial and/or temporal correlations are reintroduced in the reduced-rank channel matrix by inverse whitening. After estimation in the discrete-time domain, DFT for conversion is applied for estimation in the whole frequency band.

Method to improve channel estimate in broadband SIMO/MIMO cellular radio networks during abrupt interference variations

In radio transmission systems with point-to-point and point-to-multipoint topology a master station and one or several terminal stations are defined as well as a downstream channel from the master station to the terminal stations and an upstream channel from the terminal stations to the master station. In such systems, in order to send traffic to several terminal stations, the downstream channel is used by the master station in time division multiplexing. In some cases, the modulation type and the forward error correction, jointly called phy mode, depend on the addressed terminal. These systems are called adaptive phy mode systems. The present invention relates to adaptive phy mode systems, and it defines a power control technique for the terminal stations that also commands the phy mode switching and optimizes the system in terms of coverage, capacity and interference. In particular the terminal stations transmit with the several phy modes so that the signals are received at the master station making a performance related parameter equal. Then a hysteresis based on two different parameters (received power and available unused transmit power) is defined which regulates the phy mode switching.

Optimal two-leg histeresys for power control and phy mode switching control in adaptive phy mode systems

The present invention relates to adaptive phy mode systems, in which the modulation type and the forward error correction, jointly called phy mode, depend on the addressed terminal. Specifically, the present invention defines a power control technique for the terminal stations that also commands the phy mode switching. In particular, the peripheral stations transmit with the several phy modes so that the signals are received at the master station making a given performance related parameter equal. Then a hysteresis is defined which regulates the phy mode switching, setting suitable power thresholds of the signal. To keep the received power close to the working point of the appropriate phy mode, the master station relies on the received power level together with information regarding the unused power, which is available in the peripheral station. Thus, interference is reduced, and link coverage and throughput are optimized.

Automatic method for power control and phy mode switching control in adaptive phy mode systems

A method and a system are described to assign bandwidth in a point-to-multipoint ATM transmission system, comprising a centralized unit or Master Station (MS) and a plurality peripheral stations (PSs), in particular to assign transmission bandwidth on the channel from PSs to MS, by assigning transmission abilitations in defined time slots sending messages called Grants on the channel from MS to PSs. The system assigns bandwidth in the system using three different bandwidth allocation modalities, a static modality, and two separate dynamic modalities.

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Milan, Italy

Claudio Santacesaria