Electronics and Telecommunications Research Institute

Empire Technology Development LLC

Orange

Beijing University of Posts and Telecommunications

Other

France Telecom

Orange Sa

Kan Zheng

Young-il Kim

Wenbo Wang

Lin Huang

Lijie Hu

Fanglong Hu

Hang Long

Fangxiang Wang

Yuexing Peng

Jisoo Park

Xiaoyu Wang

Yong Su Lee

Young Jin Moon

Jie Mei

Guangwei Li

A method and a network system capable of enhanced transmission of data signals in a multiple-input multiple-output (MIMO) communication system using a double-layer coordinated beamforming are disclosed. A first layer precoding matrix is obtained from long-term channel state information between user equipment and network equipment, and a second layer precoding matrix obtained from the first layer precoding matrix and from real-time channel state information between the user equipment and the network equipment. The real-time channel state information for the second layer precoding matrix determination includes a predetermined signal-to-interference-plus-noise ratio (SINR), and/or a predetermined power value associated with a single antenna of the user equipment, which are used as optimization parameters. The first and second layer precoding matrices are combined for the double-layer coordinated beamforming. The present disclosure allows to enhance the coordinated beamforming of the prior art by adding some constraints during the optimization of the second layer precoding.

Method and device for beam forming

A method is provided to associate at least one user equipment to a plurality of component carriers. A carrier-to-interference ratio is calculated for each of component carriers available for the user equipment. Differences between the calculated carrier-to-interference ratios are calculated, with each difference being associated to a different one of the component carriers intervening in the difference, the component carriers being ordered in the decreasing order of their carrier frequency. The user equipment is associated with the component carrier having the lowest difference.

Method and device to associate at least one telecommunication user equipment to component carriers

The present invention discloses a method and device for controlling a relay transmission based on non-reproduction relay mode, comprising: each relay node within a service area to which a source node belongs obtaining channel status information between itself and the source node and channel status information between itself and a destination node, calculating required channel information for relay selection and feeding the required channel information back to the source node; after receiving channel information sent by the relay nodes, the source node, according to the channel information, selecting from the relay nodes a group of relay nodes with greatest feedback values in the channel information to forward information and selecting a group of relay nodes with second greatest feedback values to send interference information, selected relay nodes transmitting information to the destination node in cooperation with the source node in non-reproduction relay mode. By means of the method for controlling a relay transmission based on non-reproduction relay mode of the present invention, while greatly reducing network signaling load and computation complexity, the system secrecy capacity is ensured, the performance-to-cost ratio is high, and stronger applicability is achieved.

Method and device for controlling relay transmission based on non-reproduction relay mode

Distributed inter-cell interference coordination in a communications system can include: at one other femtocell system, sending channel quality information of a subordinate device communicating with the other femtocell system to the first femtocell system; receiving the channel quality information of the at least one other femtocell system at the first femtocell system; estimating an influence of a use of a resource on the communications system at the first femtocell system according to the channel quality information received by one or more of the at least one other femtocell system; and determining at the first femtocell system whether to use the resource.

Method for distributed interference coordination in a femtocell environment

A method and apparatus are provided for allocating carriers from a list of carriers in a telecommunication network. Each of the carriers allow transmission of a transmission control frame, each of said transmission control frame has a data block corresponding to a data stream and an indication of the previous carrier allocated to the data stream. The method includes, for a transmission control frame and a carrier selected for allocation to the transmission control frame in the list of carriers, the steps of determining the number of binary bits needed to identify the number of carriers in the list of carriers, coding the indication based on the determined number of binary bits, and removing the allocated carrier from the list of carriers.

Data transmission method and system

The present invention discloses a method for generating a consistent cryptographic key based on wireless channel features. First of all, channel estimated values &#x125;, &#x125;and channel estimate mean square error MSE are obtained through channel estimate, and then quantized channel eigenvectors {tilde over (h)}and {tilde over (h)}are obtained through quantization coding; next, inconsistency between {tilde over (h)}and {tilde over (h)}is equivalent to obtaining {tilde over (h)}at end B through virtual channel noise adding the channel eigenvector {tilde over (h)}sent by end A, and Signal-to-Noise ratio SNR &#x393; of the virtual channel is determined; a proper coding mode ENC is determined according to the virtual channel SNR &#x393;; both communication parties perform corresponding coding and decoding according to ENC and thereby obtain an estimated value {tilde over (&#x125;)}of {tilde over (h)}; finally, a cryptographic key generating function is applied to {tilde over (h)}and {tilde over (&#x125;)}, whereby a cryptographic key Kc is obtained. The present invention increases the validity of consistent dynamic cryptographic key generating and achieves information security and privacy at the physical layer.

Method for generating consistent cryptographic key based on wireless channel features

The present invention discloses a method for uplink multi-user cooperation communication, including a first, and a second source node and a target node. When transmitting a signal to the target node, the first source node also transmits the signal to the second source node, the second source node changing to a relay node of the first source node and forwarding the signal to the target node; the target node obtains its reception Signal Noise Ratio (SNR) by using a maximal ratio combining mode according to the signal directly transmitted from the first source node and the signal forwarded from the second source node, sets a precoding policy according to the reception SNR, and selects the optimal precoding as a precoding vector which is used when the first source node transmits a signal to the target node.

Method for uplink multi-user cooperation communication

Provided is a method and system for estimating a channel in a wireless communication system. An interference coefficient is calculated based on a known structure of a pilot, and a channel value in a frequency domain is estimated. A channel value in a time domain is obtained by transforming the channel value in the frequency domain and the channel delay values are subtracted from the channel value in the time domain, thereby cancelling interference.

Channel estimating method in wireless communication system and apparatus thereof

A power control method performs a scheduling on user terminals and then allows the user terminals to calculate power of interference by neighboring sectors, generates interference information to indicate how much the base stations in neighboring sectors, which interfere with each other, reduce transmission power based on the calculated power of interference, and informs a serving base station thereof. The base stations calculate throughput gain and throughput loss based on the interference information, and determine whether the reduction of the transmission power is performed based on the calculated throughput gain and throughput loss.

Power control method and apparatus for inter-cell interference removal

In a method for detecting a signal in a multi-input multi-output wireless communication system that receives signals transmitted through a plurality of transmission antennas by using a plurality of reception antennas, a detection order for detecting the transmission signals received through the reception antennas is determined on the basis of a cofactor determinant of components constituting a channel matrix representing characteristics of channels between the transmission antennas and the reception antennas. In addition, the transmission signal is detected from the signals received through the reception antennas in accordance with the determined detection order.

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Beijing, China

Kan Zheng