Source and a target network node and respective methods performed thereby for performing handover of a wireless device

A method performed by a target network node for handing over a wireless device to the target network node from a source network node serving the wireless device in a wireless communication network, the method comprising:

• obtaining, from the source network node, a determined first normalised Signal to Interference and Noise Ratio, SINR for the source network node in relation to the wireless device and a received signal strength for signal(s) transmitted from the target network node as received by the wireless device,
• determining a first normalised SINR for the target network node based at least partly on the received signal strength as obtained from the source network node,
• determining whether the target network node is a better option than the source network node for serving the wireless device based on the first determined SINR for the target network node and based on the received first normalised SINR for the source network node, and
• providing, to the source network node, an indication indicating whether the target network node is a better option than the source network node for serving the wireless device.

A source network node serving a wireless device in a wireless communication network, the source network node comprising:

• a processor;
• and
• memory comprising executable instructions that when executed by the processor causes the processor, when the uplink signal quality of a received uplink signal from the wireless device is deemed poor, to perform operations comprising,
• requesting the wireless device to perform measurement(s) on possible target network node(s) and the source network node,
• obtaining a measurement report from the wireless device comprising performed measurement(s) on at least one possible target network node, the performed measurements indicating received signal strength for signal(s) received from the at least one possible target node,
• determining a first normalised Signal to Interference and Noise Ratio, SINR, associated with the received signal strength as measured by the wireless device for signals received from the source network node, and
• providing, to at least one of the at least one possible target network node, the determined first normalised SINR associated with the received signal strength for the source network node and the received signal strength of the at least one of the at least one possible target network node as received in the measurement report from the wireless device.

A target network node for handing over a wireless device to the target network node from a source network node serving the wireless device in a wireless communication network, the target network node comprising:

• a processor;
• and
• memory comprising executable instructions that when executed by the processor causes the processor to perform operations comprising,
• obtaining, from the source network node, a determined first normalised Signal to Interference and Noise Ratio, SINR for the source network node in relation to the wireless device and a received signal strength for signal(s) transmitted from the target network node as received by the wireless device,
• determining a first normalised SINR for the target network node based at least partly on the received signal strength as obtained from the source network node,
• determining whether the target network node is a better option than the source network node for serving the wireless device based on the first determined SINR for the target network node and based on the received first normalised SINR for the source network node, and
• providing, to the source network node, an indication indicating whether the target network node is a better option than the source network node for serving the wireless device.