Abstract: Embodiments of systems and methods relating to a first radio device (UE) and a second radio device (base station) are disclosed. In some embodiments, a method implemented in the second radio device for adaptation of transmission over a radio channel is described. The method comprises determining a condition of the radio channel in which the radio channel exhibits an invariance of statistics and transmitting a data symbol to the first radio device via the radio channel. The method further comprises receiving a quality report of the radio channel from the first radio device based on the data symbol when a statistical characterization of the radio channel exceeds a predetermined threshold. The transmission over the radio channel is adapted by the second radio device based on the received quality report.

Abstract: A method of operating a distributed MIMO system is disclosed. The distributed MIMO system is configured to serve a plurality of wireless communication devices (u1, . . . , uN). The distributed MIMO system comprises a number of access points (A1, . . . , AK), each comprising a time circuit (180) configured to keep track of a local time of the access point (A1, . . . , AK). The method comprises performing (210) an intra-group synchronization procedure for a group (G1) of at least three access points (A1-A3). The intra-group synchronization procedure comprises, for each access point (Ai) in the group (G1), transmitting (Ti), from that access point (Ai), a synchronization signal and obtaining (Oi) a transmission time indicator indicating a transmission time of that synchronization signal in the local time of that access point (Ai).

Abstract: Method performed by a first communication device (201) for adapting a pre-coder used by a second communication device (202) to transmit radio signals using beamforming to a third communication device (203). The first communication device (201), the second communication device (202), and the third communication device (203) operate in a wireless communications network (200). The first communication device (201) adapts (301), over a single time period of transmission of the radio signals, the pre-coder used by the second communication device (202) to transmit the radio signals to the third communication device (203) using beamforming. The adapting (301) is based on a change, over the single time period, in a state of a channel used to transmit the radio signals. The state is measured by the second communication device (202).

Abstract: Embodiments of systems and methods relating to a first radio device (UE) and a second radio device (base station) are disclosed. In some embodiments, a method implemented in the second radio device for adaptation of transmission over a radio channel is described. The method comprises determining a condition of the radio channel in which the radio channel exhibits an invariance of statistics and transmitting a data symbol to the first radio device via the radio channel. The method further comprises receiving a quality report of the radio channel from the first radio device based on the data symbol when a statistical characterization of the radio channel exceeds a predetermined threshold. The transmission over the radio channel is adapted by the second radio device based on the received quality report.

Abstract: A method implemented in a first radio device (UE) for quality reporting of a radio channel (2) comprising: Determining a condition of the radio channel and entering a monitoring phase if the condition of the radio channel exhibits an invariance of statistics of the radio channel (810, 811), Receiving at least one data symbol via said radio channel during the monitoring phase (812), Determining a statistical characterization of the radio channel based on the received data symbol (813), and Reporting a quality of the radio channel (2) to a second radio device if the statistical characterization exceeds a predetermined threshold (814).

Abstract: A method is disclosed of a first wireless communication apparatus of a communication system operating in a hardened channel environment. The method comprises determining a transmission power to be used by a second wireless communication apparatus of the communication system for transmission of a signal carrying control information, participating in communication involving the signal transmitted using the determined transmission power, and using the determined transmission power to discriminate between the second wireless communication apparatus and one or more third wireless communication apparatus. The second and one or more third wireless communication apparatuses may be comprised in respective user equipments of a plurality of user equipments associated with a network node of the communication system. The first wireless communication apparatus may be comprised in the network node.

Abstract: A disturbance mitigation method of a communication element for a distributed antenna system is disclosed. The communication element is associated with two or more antenna elements of the distributed antenna system. The method comprises acquiring channel condition information associated with at least two of a plurality of wireless communication devices served by the communication element, and partitioning the plurality of wireless communication devices into at least two groups based on the acquired channel condition information. The method also comprises, for each of the groups, determining respective pre-coding weights based on the acquired channel condition information, wherein the respective pre-coding weights of different groups are determined according to different disturbance mitigation approaches.

Abstract: The present invention relates to a method of assigning a transmission timing to a radio terminal in a radio network system including at least a radio network node and a radio terminal and employing a time division duplex method dividing a transmission time in an uplink transmission time interval and a downlink transmission time interval for transmission between the radio network node and the radio terminal, comprising the following steps: determining a speed of movement of the radio terminal with respect to the radio network node; assigning to the radio terminal, based on the speed of movement, a transmission timing in the downlink or uplink transmission time interval. The present invention relates further to a radio network node and a radio terminal adapted to assigning a transmission timing according to the above method.

Abstract: A wireless device, a network node and respective methods performed thereby for communicating with each other are provided. The method performed by the wireless device comprises determining (120) a first interference level indication of a first frequency resource; and determining (125) a second interference level indication of a second frequency resource. The method (100) further comprises transmitting (130) a first uplink reference signal on the first frequency resource with a first transmission power, and transmitting (135) a second uplink reference signal on the second frequency resource with a second transmission power, wherein the first transmission power is based on the first- and second interference level indications.

Abstract: A technique for assigning pilot signals to user equipments is described. The UEs access an RBS that provides radio access. As to a method aspect of the technique, an access burst including initial pilot signals is received from the UEs, wherein at least two of the UEs apply simultaneously the same initial pilot signal. A multicast channel to the at least two UEs is estimated based on the received access burst. A combined signal power received at the RBS is computed for the at least two UEs based on the estimated multicast channel. A message to the at least two UEs is sent using the multicast channel. The message is indicative of the combined signal power and assigns different pilot signals to the at least two UEs, wherein the assignment depends for each of the at least two UEs on the combined signal power and a signal power received at the respective UE.

Abstract: A Radio Network Node (RNN) 110 and a method therein for improving capacity in a wireless communications system 100. The RNN is configured to serve a first wireless device 120 and a second wireless device (WD) 130. The RNN assigns a shared uplink pilot signal to the first and second WDs. Further, the RNN transmits, to the first WD, an indication of how possible second data intended for the second WD will be comprised in a signal to be transmitted to the first WD. Furthermore, the RNN estimates a combined channel based on a received shared uplink pilot signal from the first WD and/or the second WD. Yet further, the RNN determines a beamforming vector for the estimated combined channel; and transmits the signal to the first WD, wherein the signal comprises first data and the possible second data, which first data is decodable only by the first WD.

Abstract: A technique for assigning pilot signals to user equipments is described. The UEs access an RBS that provides radio access. As to a method aspect of the technique, an access burst including initial pilot signals is received from the UEs, wherein at least two of the UEs apply simultaneously the same initial pilot signal. A multicast channel to the at least two UEs is estimated based on the received access burst. A combined signal power received at the RBS is computed for the at least two UEs based on the estimated multicast channel. A message to the at least two UEs is sent using the multicast channel. The message is indicative of the combined signal power and assigns different pilot signals to the at least two UEs, wherein the assignment depends for each of the at least two UEs on the combined signal power and a signal power received at the respective UE.

Abstract: A method for detecting a data transmission, the method including measuring a signal level for each of a predetermined plurality of distinct time-frequency transmission resources within a first time interval, non-coherently summing the measured signal levels, and comparing the sum to at least a first threshold to determine whether a channel-hardened signal targeted to the wireless receiver is present. A corresponding method for encoding a channel-hardened signal comprises transmitting, in a first time interval and using M antenna ports and T1 time-frequency resources, an array X of M×T1 symbols, where each row of the array corresponds to one of the M antenna ports and each column of the array X corresponds to one of the first set of T1 time-frequency resources. X satisfies the expression XXH=aI, where XII is the conjugate transpose of X, I is an identity matrix, and ? is a constant.

Abstract: A method is disclosed of a first wireless communication apparatus of a communication system operating in a hardened channel environment. The method comprises determining a transmission power to be used by a second wireless communication apparatus of the communication system for transmission of a signal carrying control information, participating in communication involving the signal transmitted using the determined transmission power, and using the determined transmission power to discriminate between the second wireless communication apparatus and one or more third wireless communication apparatus. The second and one or more third wireless communication apparatuses may be comprised in respective user equipments of a plurality of user equipments associated with a network node of the communication system. The first wireless communication apparatus may be comprised in the network node.

Abstract: There is provided mechanisms for data transmission on a contention based physical data channel (PDCH). The method is performed by a wireless device. The method comprises sending a first data transmission on the contention based PDCH to an access node. The method comprises receiving a response to the first data transmission from the access node. The method comprises determining a signal strength of the response. The method comprises acting as the first data transmission either was collision-free or collided with another data transmission of another wireless depending on a comparison between the signal strength and a threshold defined by an expected signal strength of the response.

Abstract: A method implemented in a first radio device (UE) for quality reporting of a radio channel (2) comprising: Determining a condition of the radio channel and entering a monitoring phase if the condition of the radio channel exhibits an invariance of statistics of the radio channel (810, 811), Receiving at least one data symbol via said radio channel during the monitoring phase (812), Determining a statistical characterization of the radio channel based on the received data symbol (813), and Reporting a quality of the radio channel (2) to a second radio device if the statistical characterization exceeds a predetermined threshold (814).

Abstract: The present invention relates to a method of assigning a transmission timing to a radio terminal in a radio network system including at least a radio network node and a radio terminal and employing a time division duplex method dividing a transmission time in an uplink transmission time interval and a downlink or uplink transmission time interval for transmission between the radio network node and the radio terminal, comprising the following steps: determining a speed of movement of the radio terminal with respect to the radio network node; assigning to the radio terminal, based on the speed of movement, a transmission timing in the downlink or uplink transmission time interval. The present invention relates further to a radio network node and a radio terminal adapted to assigning a transmission timing according to the above method.

Abstract: Method performed by a first communication device (201) for adapting a pre-coder used by a second communication device (202) to transmit radio signals using beamforming to a third communication device (203). The first communication device (201), the second communication device (202), and the third communication device (203) operate in a wireless communications network (200). The first communication device (201) adapts (301), over a single time period of transmission of the radio signals, the pre-coder used by the second communication device (202) to transmit the radio signals to the third communication device (203) using beamforming. The adapting (301) is based on a change, over the single time period, in a state of a channel used to transmit the radio signals. The state is measured by the second communication device (202).

Abstract: There is provided mechanisms for data transmission on a contention based physical data channel (PDCH). The method is performed by a wireless device. The method comprises sending a first data transmission on the contention based PDCH to an access node. The method comprises receiving a response to the first data transmission from the access node. The method comprises determining a signal strength of the response. The method comprises acting as the first data transmission either was collision-free or collided with another data transmission of another wireless depending on a comparison between the signal strength and a threshold defined by an expected signal strength of the response.

Abstract: A Radio Network Node (RNN) 110 and a method therein for improving capacity in a wireless communications system 100. The RNN is configured to serve a first wireless device 120 and a second wireless device (WD) 130. The RNN assigns a shared uplink pilot signal to the first and second WDs. Further, the RNN transmits, to the first WD, an indication of how possible second data intended for the second WD will be comprised in a signal to be transmitted to the first WD. Furthermore, the RNN estimates a combined channel based on a received shared uplink pilot signal from the first WD and/or the second WD. Yet further, the RNN determines a beamforming vector for the estimated combined channel; and transmits the signal to the first WD, wherein the signal comprises first data and the possible second data, which first data is decodable only by the first WD.