Wireless communication system, a wireless device, network nodes, and methods therein, for changing master node for the wireless device

A wireless device configured to change a master node for the wireless device, wherein the wireless device, a first network node comprising a first processor, a second network node comprising a second processor and a third network node comprising a third processor are operating in a wireless communications system, wherein the first network node is connected to the wireless device as the master node for the wireless device, wherein the second network node and the third network node are connected to the wireless device as secondary nodes for the wireless device, and wherein the wireless device comprises:

• an input/output interface configured to communicate with the wireless communication system;
• and
• a processor configured to,
• receive a signal through the input/output interface, which signal comprises information about a change of the master node from the first network node to the third network node currently connected to the wireless device as a secondary node and information to the wireless device to reuse a set of existing protocol entities and context for communication with the third network node;
• and
• reuse the set of existing protocol entities and context for communication with the third network as the master node.

A first network node configured to change a master node for a wireless device, wherein the wireless device comprising a first processor, the first network node, and a third network node comprising a second processor are operating in a wireless communications system, wherein the first network node is connected to the wireless device as the master node for the wireless device, wherein the third network node is connected to the wireless device as a secondary node for the wireless device, and wherein the first network node comprises:

• an input/output interface configured to communicate with the wireless device and with the second network node and the third network node;
• and
• a processor configured to:
• transmit a first signal through the input/output interface to the third network node, which first signal comprises information that the third network node currently connected to the wireless device as a secondary node is to be the master node for the wireless device and information to the third network node to reuse a first set of existing protocol entities and context for communication with the wireless device;
• and
• transmit a second signal through the input/output interface to the wireless device, which second signal comprises information about a change of master node from the first network node to the third network node and information to the wireless device to reuse a second set of existing protocol entities and context for communication with the third network node, whereby the master node for the wireless device is changed to the third network node.

A third network node configured to change a master node for a wireless device comprising a first processor, wherein the wireless device, a first network node comprising a second processor, and a second network node comprising a third processor, and the third network node are operating in a wireless communications system, wherein the first network node is connected to the wireless device as the master node for the wireless device, wherein the second network node and the third network node are connected to the wireless device as secondary nodes for the wireless device;

• and wherein the third network node comprises:
• an input/output interface configured to communicate with the wireless device and with the first and second network nodes;
• and
• a processor configured to,
• receive a first signal through the input/output interface, which first signal comprises information that the third network node currently connected to the wireless device as a secondary node is to be the master node for the wireless device and information to the third network node to reuse a first set of existing protocol entities and context for communication with the wireless device;
• transmit a second signal through the input/output interface to the wireless device, which second signal comprises information about a change of master node from the first network node to the third network node and information to the wireless device to reuse a second set of existing protocol entities and context for communication with the third network node;
• and
• transmit a third signal through the input/output interface to the second network node, which third signal comprises information that the third network node is the master node for the wireless device and information to the second network node to reuse a third set of existing protocol entities and context for communication with the wireless device, whereby the master node for the wireless device is changed to the third network node.

A method performed by a third network node to change a master node for a wireless device, wherein the wireless device comprising a first processor, a first network node comprising a second processor, a second network node comprising a third processor and the third network node comprising a fourth processor are operating in a wireless communications system, wherein the first network node is connected to the wireless device as the master node for the wireless device, wherein the second network node and the third network node are connected to the wireless device as secondary nodes for the wireless device;

• and wherein the method comprises:
• receiving a first signal, which first signal comprises information that the third network node currently connected to the wireless device as a secondary node is to be the master node for the wireless device and information to the third network node to reuse a first set of existing protocol entities and context for communication with the wireless device;
• transmitting a second signal to the wireless device, which second signal comprises information about a change of master node from the first network node to the third network node and information to the wireless device to reuse a second set of existing protocol entities and context for communication with the third network node;
• and
• transmitting a third signal to the second network node, which third signal comprises information that the third network node is the master node for the wireless device and information to the second network node to reuse a third set of existing protocol entities and context for communication with the wireless device, whereby the master node for the wireless device is changed to the third network node.