A multi-user uplink transmission is performed by analyzing, by a first wireless station, a spatial reuse field in a first frame, and generating, by the first wireless station, a second frame, wherein the second frame includes a spatial reuse field that is generated based on the spatial reuse field of the first frame. The first frame and the second frame are within the same transmission opportunity (TXOP) and the first frame is transmitted prior to the second frame during the TXOP.

A multi-user uplink transmission is performed by analyzing, by a first wireless station, a spatial reuse field in a first frame, and generating, by the first wireless station, a second frame, wherein the second frame includes a spatial reuse field that is generated based on the spatial reuse field of the first frame. The first frame and the second frame are within the same transmission opportunity (TXOP) and the first frame is transmitted prior to the second frame during the TXOP.

A random access method including receiving, by a user equipment, a radio resource control (RRC) connection reconfiguration message from a first network device, where the RRC connection reconfiguration message is included in a first message sent by a second network device to the first network device, and where the RRC connection reconfiguration message indicates a primary serving cell of the second network device for the user equipment, and further indicates an active bandwidth part (BWP) in the primary serving cell, and the method further including initiating, by the user equipment, a random access procedure on the active BWP.

A random access method including receiving, by a user equipment, a radio resource control (RRC) connection reconfiguration message from a first network device, where the RRC connection reconfiguration message is included in a first message sent by a second network device to the first network device, and where the RRC connection reconfiguration message indicates a primary serving cell of the second network device for the user equipment, and further indicates an active bandwidth part (BWP) in the primary serving cell, and the method further including initiating, by the user equipment, a random access procedure on the active BWP.

Methods (1500, 1600, 1700, 1800, 1900), systems (1000, 1400) and devices (705, 805, 1005, 1105, 1205, 1405) for wireless communications are presented. A method (1500, 1600) may include the following operations. A UE determines to perform a handover from a first source device in a first network to a first target device in the first network and from a second source device in a second network to a second target device in the second network (1505, 1605). The UE identifies a time interval for performing a first random access procedure with the first target device in the first network (1510, 1610). The UE initiates a first random access procedure with the first target device (1515, 1615). The UE performs a second random access procedure successfully with the second target device in the second network during the time interval (1520, 1620). The UE transmits or receives from the target device in the second network before the UE finishes performing the first random access procedure with the first target device in the first network (1525, 1630).

Methods (1500, 1600, 1700, 1800, 1900), systems (1000, 1400) and devices (705, 805, 1005, 1105, 1205, 1405) for wireless communications are presented. A method (1500, 1600) may include the following operations. A UE determines to perform a handover from a first source device in a first network to a first target device in the first network and from a second source device in a second network to a second target device in the second network (1505, 1605). The UE identifies a time interval for performing a first random access procedure with the first target device in the first network (1510, 1610). The UE initiates a first random access procedure with the first target device (1515, 1615). The UE performs a second random access procedure successfully with the second target device in the second network during the time interval (1520, 1620). The UE transmits or receives from the target device in the second network before the UE finishes performing the first random access procedure with the first target device in the first network (1525, 1630).

A method for indicating transmission of a buffered downlink data frame under multi-connection. An access point generates a message frame including first information and second information, and sends the message frame to a station. The first information is configured to indicate that a downlink data frame of the station is buffered at the access point, and the second information is configured to indicate the station to receive the downlink data frame buffered by the access point under multi-connection. A method for receiving a buffered downlink data frame under multi-connection is also disclosed.

A method for indicating transmission of a buffered downlink data frame under multi-connection. An access point generates a message frame including first information and second information, and sends the message frame to a station. The first information is configured to indicate that a downlink data frame of the station is buffered at the access point, and the second information is configured to indicate the station to receive the downlink data frame buffered by the access point under multi-connection. A method for receiving a buffered downlink data frame under multi-connection is also disclosed.

Various techniques are provided for receiving, by a user equipment (UE) from an access node (AN), a first random access channel (RACH) configuration available for random access transmission, receiving, by the UE from the AN, a second RACH configuration including at least one reserved extended spectral resource and an indication configured to cause the UE to enable a spectrally extended RACH transmission, and communicating, by the UE to the AN, using at least a portion of a reserved extended spectral resources.

Various techniques are provided for receiving, by a user equipment (UE) from an access node (AN), a first random access channel (RACH) configuration available for random access transmission, receiving, by the UE from the AN, a second RACH configuration including at least one reserved extended spectral resource and an indication configured to cause the UE to enable a spectrally extended RACH transmission, and communicating, by the UE to the AN, using at least a portion of a reserved extended spectral resources.