According to various embodiments, a method of controlling data communication of an electronic device, the method comprising performing the directional wireless communication together with an external electronic device capable of performing the directional wireless communication and the omni-directional wireless communication, by using the first wireless communication circuit, determining the distance between an electronic device and the external electronic device, at least partially on the basis of a signal of the external electronic device received by using the second wireless communication circuit, when the stop or degradation of the directional wireless communication is detected, and determining whether to reattempt the directional wireless communication using the first wireless communication circuit, at least partially on the basis of the determined distance or to start the omni-directional wireless communication using the second wireless communication circuit. Other embodiments are possible.

A method and apparatus may be used in multi-AP and multi-wireless transmit/receive unit joint transmissions. The apparatus may be configured to transmit a joint transmission request on a first medium, and receive a joint transmission response on the first medium. In response, the apparatus my perform a joint transmission negotiation on a second medium and transmit data on the second medium based on the joint transmission negotiation. The apparatus may be configured to perform coordinated sectorized or beamformed transmissions through access point (AP)/PCP negotiations. The apparatus may provide an indication of support for joint transmission and coordinated sectorized or beamformed transmissions. The method and apparatus may also implement multi-AP/WTRU request-to-send (RTS)/clear-to-send (CTS) procedures. The apparatus may be configured to perform coordinated sectorized or beamforming grouping.

In one aspect of the teachings herein, a radio network node advantageously adapts the transmission duration of a synchronization signal with respect to transmission of the synchronization signal in different directions. For example, the radio network node uses a shorter transmission duration in beam directions that are associated with better reception conditions and a longer transmission duration in beam directions that are associated with poorer reception conditions. As a consequence of varying the transmission duration according to received-signal qualities known or expected for the different directions, the radio network node can shorten the overall time needed to complete one synchronization-signal transmission cycle and use less energy, as compared to using a more conservative, longer transmission time in all beam directions.

Methods and apparatus for improved utilization of air link resources are discussed in wireless communications systems employing multi-sector base stations and wireless terminals with multiple antennas. Timing synchronization is maintained across the base station sectors, and the same set of tones are used in adjacent sectors. In a sector boundary region, which is typically a high interference region, a wireless terminal is set to a sector pair state and operated in a MIMO mode of operation, communicating with two adjacent base station antenna faces of the same base station concurrently, the two different adjacent base station antenna faces corresponding to different adjacent sectors. Thus, typically high interference sector boundary regions, are converted into high capacity regions by having the sectors coordinated and utilizing MIMO techniques.

Methods and apparatus for improved utilization of air link resources are discussed in wireless communications systems employing multi-sector base stations and wireless terminals with multiple antennas. Timing synchronization is maintained across the base station sectors, and the same set of tones are used in adjacent sectors. In a sector boundary region, which is typically a high interference region, a wireless terminal is set to a sector pair state and operated in a MIMO mode of operation, communicating with two adjacent base station antenna faces of the same base station concurrently, the two different adjacent base station antenna faces corresponding to different adjacent sectors. Thus, typically high interference sector boundary regions, are converted into high capacity regions by having the sectors coordinated and utilizing MIMO techniques.

The present invention relates to a data transmission device and reception device in a wireless AV system. The present specification discloses a wireless data reception device comprising: a communication unit configured to receive data relating to an image from a wireless data transmission device via a wireless channel; a display unit for outputting the image; a processor configured to execute a standby mode in which a wireless data reception device or the wireless data transmission device is deactivated, and a connection reestablishment mode in which, when the wireless data reception device and the wireless data transmission device are activated, a connection setup relating to the wireless data transmission device is performed; and a memory connected to the processor and configured to store data relating to the image according to a command of the processor.

The present invention relates to a data transmission device and reception device in a wireless AV system. The present specification discloses a wireless data reception device comprising: a communication unit configured to receive data relating to an image from a wireless data transmission device via a wireless channel; a display unit for outputting the image; a processor configured to execute a standby mode in which a wireless data reception device or the wireless data transmission device is deactivated, and a connection reestablishment mode in which, when the wireless data reception device and the wireless data transmission device are activated, a connection setup relating to the wireless data transmission device is performed; and a memory connected to the processor and configured to store data relating to the image according to a command of the processor.

A system includes a base band unit pooling component that determines, via a base band unit pool of base station devices, respective uplink channel estimates of an uplink channel wirelessly coupling, using frequency division duplexing via respective modular antenna elements, a user equipment to the base band unit pool. A downlink channel estimation component of the system derives, based on the respective uplink channel estimates, a downlink channel estimate of a downlink channel wirelessly coupling, using the frequency division duplexing via a portion of the respective modular antenna elements corresponding to a base station device of the base band unit pool, the base station device to the user equipment. In turn, the system generates, using the downlink channel estimate, a group of downlink sector beams to be transmitted to the user equipment using the downlink channel via the portion of the respective modular antenna elements.

In order to control communication operations properly in a secondary cell even when a beam failure and/or a BR failure occur in the secondary cell, a user terminal, according to one aspect of the present disclosure, has a control section that controls adjustment of a deactivation timer for a certain secondary cell and/or indication of a beam failure and/or a beam recovery (BR) failure in the certain secondary cell, based on the beam failure and/or a result of BR in the certain secondary cell, and a transmission section that transmits information about the beam failure and/or the BR failure in the certain secondary cell by using another cell.

A sector level sweep method and apparatus are provided. A local end generates a first sector sweep packet at the local end sector sweep stage, and the local end sends the first sector sweep packet to a peer end by using a first beam. A quantity of bytes of the first sector sweep packet is not greater than 27, the first sector sweep packet includes beam indication information of the first beam, the beam indication information includes antenna identification information of the beam, and a maximum quantity of antennas indicated by the antenna identification information is at least 8.