Methods, apparatus, and systems for wireless communications are disclosed. A first base station may receive one or more message from a second base station. The messages may include downlink beamforming information elements for a downlink cell. Each downlink beamforming information element may be associated with a respective group of resource blocks of a plurality of groups of resource blocks in the downlink cell. The first base station may select a first beamforming codeword for at least one group of resource blocks of the plurality of groups of resource blocks based on the downlink beamforming information associated with the at least one group of resource blocks. The first base station may transmit, to a wireless device, signals on the at least one group of resource blocks employing the first beamforming codeword.

The embodiments of the invention relate to a method for operating a first base station (BS1) in a radio communication system (RAN). The method contains transmitting first reference signals via a first radiation beam (BM1-BS1) being directed towards a first direction and at least second reference signals via at least one second radiation beam (BM2-BS1, . . . , BM5-BS1) being directed towards at least one second direction. The method further contains receiving for a hand over of a mobile station (MS) from a second base station (BS2) being a serving base station of the mobile station (MS) to the first base station (BS1) an indication for a radiation beam being selected from a group of radiation beams comprising the first radiation beam (BM1-BS1) and the at least one second radiation beam (BM2-BS1, . . . , BM5-BS1) for applying the selected radiation beam as an initial radiation beam at the first base station (BS1) for serving the mobile station (MS). The method even further contains scheduling radio resources for the initial radiation beam for serving the mobile station (MS) based on the indication. The embodiments further relate to a method for operating a second base station (BS2) in a radio communication system (RAN), to a first base station (BS1) for operation in a radio communication system (RAN) and to a second base station (BS2) for operation in a radio communication system (RAN).

The present application relates to the field of communications technologies, and provides an inter-small cell handover method, a device, and a system. When UE is in a coverage hole of a serving small cell, the UE needs to perform synchronous measurement only on each available beam pair in a set of available small cells determined by the UE, thereby reducing a delay of re-accessing a high frequency network by the UE, and improving QoS of receiving a high frequency service by the UE. the present application includes: performing, by UE, synchronous measurement, to determine a set of small cells available for the UE; sending the set of available small cells to a macro base station; when the UE is in a coverage hole of a current serving small cell, receiving, by the UE, a first synchronization indication sent by the macro base station.

A first wireless device receives from a first base station, configuration parameters of one or more beams of a first cell of the first base station. The first wireless device determines a connection failure with the first cell based on considering at least one criterion during a period of time in which the first wireless device employs at least a first beam of the one or more beams. The first wireless device selects a second cell of a second base station in response to the connection failure. The first wireless device transmits to the second base station, a first message comprising a radio link failure report. The radio link failure report comprises: a first beam identifier of the first beam; and a first cell identifier of the first cell.

A wireless device may receive from a first base station, measurement configuration parameters of a measurement of the wireless device. The measurement configuration parameters comprise first beam identifiers of a first plurality of beams, second beam identifiers of a second plurality of beams and a measurement event indicating that a second combined reference signal measurement value of the second plurality of beams exceeds a first combined reference signal measurement value of the first plurality of beams by more than a first offset value. The first plurality of beams and the second plurality of beams are monitored to determine an occurrence of the measurement event. The first base station transmits a measurement report in response to the occurrence of the first measurement event. The measurement report comprises: the first combined reference signal measurement value and the second combined reference signal measurement value.

A second base station receives first message from a first base station. The first message comprises neighbor beam information of a first cell of the first base station. The neighbor beam information comprises: a neighbor cell identifier of a neighbor cell of the first cell; a first beam index of a first beam of the first cell; and at least one neighbor beam index of at least one neighbor beam of the first beam of the first cell. The at least one neighbor beam is associated with a third base station. The second base station makes a handover decision for a wireless device towards the first cell based on the neighbor beam information. The second base station transmits to the first base station, a handover request for the wireless device in response to the handover decision.

A base station receives a first message comprising mobility parameter(s) from a second base station. The mobility parameter(s) may comprise a power value of a handover trigger change for a wireless device handover between: first beam(s) of a first cell of the base station; and second beam(s) of a second cell of the second base station. A measurement report may be received from the wireless device. The measurement report may comprise: first received power value(s) associated with the first beam(s); and second received power value(s) associated with the second beam(s). A handover decision may be made for the wireless device based on the first message and the measurement report. A second message may be transmitted to the second base station. The second message may indicate a handover request for the wireless device in response to the handover decision.

Methods and apparatus are provided for aggressive beam selection during a handover procedure. A User Equipment (UE) measures a plurality of candidate downlink beams of a target base station (BS), wherein measurement opportunities for each of the candidate downlink beams are scheduled periodically. The UE reports measurements relating to one or more of the measured candidate downlink beams to a source BS. The UE receives a command to handover to the target BS, and in response to receiving the command, attempts to find a new downlink beam of the target BS having a corresponding measurement opportunity that is earlier than a next measurement opportunity of one of the one or more candidate downlink beam.

There is provided mechanisms for shaping transmission beams in a wireless communications network. A method is performed by a network node. The method comprises acquiring channel measurements from wireless devices served by radio access network nodes using current beam forming parameters and being controlled by the network node. The method comprises determining, based on the channel measurements, desired beam forming parameters for shaping the transmission beams for at least one of the radio access network nodes. The method comprises initiating network controlled handover of at least some of the wireless devices served by the radio access network nodes based on the desired beam forming parameters. The method comprises initiating a change of the current beam forming parameters to the desired beam forming parameters for shaping the transmission beams for the at least one of the radio access network nodes only after having initiated said network controlled handover.

Method and apparatus are disclosed for beamforming for wireless vehicle communication. An example vehicle includes an antenna array for beamforming, a navigation controller for determining a vehicle location and a travel route, and a beamforming controller. The beamforming controller is to identify a signal strength with a first transceiver and search, upon the signal strength being less than a threshold, for a second transceiver based on transceiver mapping information, the vehicle location, and the travel route. The beamforming controller also is to adjust the antenna array to beamform in a predicted direction to the second transceiver.