Method and access node for controlling uplink transmissions in a wireless network

An access node arranged to control uplink transmissions from wireless devices in a wireless network, comprising:

• one or more processors;
• and
• a memory, wherein said memory comprising instructions, which when executed by the one or more processors, cause the one or more processors to perform operations to the access node to:
• detect presence of at least one Narrow Band wireless device capable of receiving and decoding signals on a first bandwidth channel and at least one legacy wireless device capable of receiving and decoding signals on a second bandwidth channel which is broader than and covers the first bandwidth channel, wherein when the detected at least one legacy wireless device includes a wireless device that is incapable of using the IEEE standard 802.11ax,
• receive from a Narrow Band wireless device an uplink transmission that indicates pending uplink data in the Narrow Band wireless device, and
• perform a downlink transmission comprising a Trigger Frame transmitted on the first bandwidth channel which indicates that the Narrow Band wireless device is allowed to transmit its pending uplink data on allocated resources within the first bandwidth channel, in response to the received request, and a Clear-To-Send, CTS, message transmitted on the second bandwidth channel which indicates that the second bandwidth channel is occupied.