Nokia Technologies Oy

Nokia Corporation

Pekka Janis

Klaus Hugl

Klaus Franz Doppler

Carl Simon Wijting

Cassio Ribeiro

Honglei Miao

Osman Nuri Can Yilmaz

Juha Sakari Korhonen

Olav Tirkkonen

Olli Alanen

Markus Nentwig

Jarkko Lauri Sakari Kneckt

Cássio Barboza Ribiero

This document discloses a solution for enabling overlapping transmissions in a wireless network. An apparatus may be arranged to detect a response to a frame, the response transmitted from a first device as addressed to a second device different from the apparatus and comprising a first value indicating a received signal strength between the first device and the second device. The apparatus may determine a second value indicating a received signal strength of the response in the apparatus and cause transmission of a frame that overlaps with a transmission between the first device and the second device only if the second value in proportion to the first value is below a determined threshold.

Transmission coordination in wireless network

The exemplary embodiments provide at least a method for receiving from a serving access node information of communications of at least one other access node, the information comprising interference conditions of at least one distributed enhanced physical downlink control channel set used by the at least one other access node, and the communications comprising transmissions from two or more antenna ports of the at least one other access node, estimating different interference conditions with respect to communications from different antenna ports of the two or more antenna ports based on the information; and using an enhanced receiver based on the estimated at least two different interference conditions. Further, the exemplary embodiments provide at least determining by a serving access node information of interference conditions of at least one distributed enhanced physical downlink control channel set used by at least one other access node; and sending towards user equipment the information.

Network assisted interference suppression

Disclosed is a method and an apparatus providing antenna port sharing and a demodulation reference signals (DMRS) based precoding scheme for a distributed enhanced physical downlink control channel (E-PDCCH) using, for example, spatial frequency block codes (SFBC)/frequency selective transmit diversity (FSTD) transmit diversity. The method exhibits the same performance as SFBC/FSTD transmit diversity using un-precoded DMRS while not prohibiting another UEs' localized E-PDCCH to be potentially multiplexed in a same physical resource block (PRB) pair. The SFBC/FSTD transmission is facilitated by mapping a subset of layers to DMRS ports used by other UEs for localized and beamformed transmission, while the precoders for the remaining layers arc selected to be orthogonal to the other UEs precoders thereby providing good performance wide minimizing DMRS port usage. Specifically, no additional DMRS ports are needed for spatial diversity transmission.

Transmit diversity on a control channel without additional reference signals

A method and apparatus can be configured to measure channel conditions of a first channel (). The first channel can correspond to a first frequency. The method can also include predicting whether the channel conditions of a second channel are favorable for offloading communication occurring on the first channel to the second channel based on measurements performed on the first channel (). The second channel can correspond to a second frequency. The second frequency can be higher than the first frequency. The method can also include determining a rate of occurrence for monitoring the second channel based on the results of the predicting ().

Method and apparatus of switching communications from a first channel to a second channel of higher-frequency

Methods, apparatuses, and computer programs for providing a flexible frequency location for a backwards compatible carrier in a communication system are provided. Embodiments of the invention enable a backwards compatible carrier segment supporting all or a subset of legacy LTE Release transmission modes to be located at an arbitrary position on the system bandwidth (BW) through a cyclic extension of reference signals, such as channel state information reference signals (CSI-RS), and/or other resource element configurations, such as interference measurement reference signals (IMRS), required for supporting PDSCH operation outside the backwards compatible carrier segment.

Cyclic channel state information reference signal configuration for new carrier type with backward compatible segment

Communication systems may benefit from signaling for resource mapping. For example, third generation partnership project (3GPP) long term evolution advanced (LTE-Advanced) may benefit from signaling for enhanced downlink control channel (ePDCCH) resource mapping in support of coordinated multipoint (CoMP) transmission.

Signaling for ePDCCH resource mapping in the support of CoMP

A method is disclosed that includes selecting one or more terminals involved in a device-to-device communication to which interference caused by a transmission to one or more other terminals should be suppressed, and choosing a number of degrees of freedom from a predetermined number of degrees of freedom to be used to suppress interference towards the selected one or more terminals. The method also includes using the remaining degrees of freedom from the predetermined number to increase signal quality to the one or more other terminals and performing precoding based on the chosen number of degrees of freedom and the remaining degrees of freedom. The method further includes, using at least the performed precoding, transmitting information to the one or more other terminals. Apparatus and programs/program products are also disclosed.

Interference suppression during device-to-device communications

An approach for providing interference measurements for device-to-device communication is disclosed. A logic generates a control signal to instruct a plurality of stations to perform measurement relating to interference or path loss by the stations. The logic then receives measurement information from the stations and determines, based on the measurement information, whether resources are to be scheduled to provide direct communication between two of the stations.

Method and apparatus for providing interference measurements for device to-device communication

An apparatus includes a controller configured to be coupled with a radio interface of a first wireless network node. The controller is further configured to respond to a spectrum emission mask that includes indications of both desirable emissions and undesirable emissions over a plurality of radio resource allocation units and to estimate a signal to noise ratio in individual ones of radio resource allocation units at at least one second node, to select an appropriate modulation-and-coding scheme per radio resource allocation unit and to schedule transmissions for the radio interface on the radio resource allocation units using the selected modulation-and-coding scheme. The controller is further configured to receive via the radio interface a beacon transmission from a second node, where the beacon transmission indicates a receiver sensitivity of the second node. The controller estimates a path loss to the second node that transmitted the beacon in accordance with knowledge of a transmission power with which the beacon was transmitted and considers distortion characteristics associated with the radio interface, the estimated path loss and the estimated signal to noise ratio so as to allocate transmit signal energy such that a sum of the desirable emissions and the undesirable emissions is less than limits imposed by the spectrum emission mask.

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Espoo, Finland

Pekka Janis