Waking up a dozing wireless device

A method comprising:

• determining, by an access node of a wireless network, to transmit frames on a frequency channel;
• determining, by the access node, a first sub-band of the frequency channel for wake-up radio transmissions according to a wake-up radio access technology and a second sub-band of the frequency channel, different from the first sub-band, for main radio transmissions according to another radio access technology;
• performing, by the access node, an allocation of the first sub-band for the wake-up radio transmissions and a simultaneous allocation of the second sub-band for the main radio transmissions;
• transmitting, by the access node by using a main radio interface of the access node operating according to said another radio access technology, a frame comprising a header indicating said allocations, and
• transmitting, by the access node after transmitting the header, a wake-up signal on the first sub-band by using a wake-up radio interface of the access node operating according to the wake-up radio access technology and, simultaneously, transmitting another radio signal on the second sub-band by using the main radio interface of the access node.

An apparatus for an access node, the apparatus comprising:

• at least one processor;
• and
• at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to:
• determine to transmit frames on a frequency channel;
• determine a first sub-band of the frequency channel for wake-up radio transmissions according to a wake-up radio access technology and a second sub-band of the frequency channel, different from the first sub-band, for main radio transmissions according to another radio access technology;
• perform an allocation of the first sub-band for the wake-up radio transmissions and a simultaneous allocation of the second sub-band for the main radio transmissions;
• use a main radio interface of the access node operating according to said another radio access technology to transmit a frame comprising a header indicating said allocations, and use, after transmitting the header, a wake-up radio interface of the access node operating according to the wake-up radio access technology to transmit a wake-up signal on the first sub-band and, simultaneously, use the main radio interface of the access node to transmit another radio signal on the second sub-band.

An apparatus for a wireless device, comprising:

• at least one processor;
• and
• at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to:
• determine a first sub-band of a frequency channel of a wireless network for wake-up radio transmissions according to a wake-up radio access technology and a second sub-band of the frequency channel, different from the first sub-band, for main radio transmissions according to another radio access technology;
• enter a dormant mode where a main radio interface of the wireless device is disabled and a wake-up radio interface of the wireless device is configured to scan the first sub-band for a wake-up radio signal, wherein the main radio interface operates according to the other radio access technology;
• detect, by using the wake-up radio interface, the wake-up radio signal on the first sub-band and, in response to said detecting, enable the main radio interface to transfer a frame on the frequency channel.