Data transmission and reception techniques for handover scenarios

A method of data packet transmission, comprising:

• receiving, by a target donor node from a source donor node, a handover request message;
• receiving, by the target donor node, rerouted data packets from an Integrated Access Backhaul (IAB) node;
• and
• forwarding, by the target donor node to the source donor node, the rerouted data packets based on information in the handover request message for the target donor node to forward data;
• wherein the information for the target donor node to forward the data comprises Transport Network Layer (TNL) information of an F1-U interface,
• the TNL information comprises a transport layer IP address,
• the transport layer IP address is an IP address of the IAB node, and
• the transport layer IP address is allocated by the source donor node.

A method of data packet transmission, comprising:

• determining, by an Integrated Access Backhaul (IAB) node, rerouted data packets comprising data packets which have been transmitted by the IAB node to a next hop IAB node but for which no Radio Link Control Layer Protocol (RLC) acknowledgement feedback has been received from the next hop IAB node, and data packets having been subjected to RLC processing by the IAB node but having not been transmitted to the next hop IAB node;
• and
• transmitting, by the IAB node, the rerouted data packets to a target donor node according to information for the target donor node to forward data;
• wherein the information for the target donor node to forward the data comprises Transport Network Layer (TNL) information of an F1-U interface,
• the TNL information comprises a transport layer IP address,
• the transport layer IP address is an IP address of the IAB node, and
• the transport layer IP address is allocated by a source donor node.

An apparatus comprising one or more processors configured to cause the apparatus to implement a method, comprising:

• transmit, by a source donor node to a target donor node, a handover request message comprising information for the target donor node to forward data;
• and
• receive, by the source donor node, rerouted data packets forwarded by the target donor node, wherein the rerouted data packets are sent from an Integrated Access Backhaul (IAB) node to the target donor node, and the rerouted data packets are forwarded by the target donor node based on the information in the handover request message for the target donor node to forward data,
• wherein the information for the target donor node to forward the data comprises Transport Network Layer (TNL) information of an F1-U interface,
• the TNL information comprises a transport layer IP address,
• the transport layer IP address is an IP address of the IAB node, and
• the transport layer IP address is allocated by a source donor node.

A non-transient computer readable storage medium having a computer program stored thereon, wherein the computer program, when executed by at least one processor, causing an apparatus to implement a method, comprising:

• transmitting, by a source donor node to a target donor node, a handover request message comprising information for the target donor node to forward data;
• and
• receiving, by the source donor node, rerouted data packets forwarded by the target donor node, wherein the rerouted data packets are sent from an Integrated Access Backhaul (IAB) node to the target donor node, and the rerouted data packets are forwarded by the target donor node based on the information in the handover request message for the target donor node to forward data,
• wherein the information for the target donor node to forward the data comprises Transport Network Layer (TNL) information of an F1-U interface,
• the TNL information comprises a transport layer IP address,
• the transport layer IP address is an IP address of the IAB node, and
• the transport layer IP address is allocated by a source donor node.

An apparatus comprising one or more processors configured to cause the apparatus to implement a method, comprising:

• receive, by a target donor node from a source donor node, a handover request message;
• receive, by the target donor node, rerouted data packets from an Integrated Access Backhaul (IAB) node;
• and
• forward, by the target donor node to the source donor node, the rerouted data packets based on information in the handover request message for the target donor node to forward data;
• wherein the information for the target donor node to forward the data comprises Transport Network Layer (TNL) information of an F1-U interface,
• the TNL information comprises a transport layer IP address,
• the transport layer IP address is an IP address of the IAB node, and
• the transport layer IP address is allocated by a source donor node.

An apparatus comprising one or more processors configured to cause the apparatus to implement a method, comprising:

• determine, by an Integrated Access Backhaul (IAB) node, rerouted data packets comprising data packets which have been transmitted by the migrating IAB access node to a next hop IAB node but for which no Radio Link Control Layer Protocol (RLC) acknowledgement feedback has been received from the next hop IAB node, and data packets having been subjected to RLC processing by the IAB node but having not been transmitted to the next hop IAB node;
• and
• transmit, by the IAB node, the rerouted data packets to a target donor node according to information for the target donor node to forward data;
• wherein the information for the target donor node to forward the data comprises Transport Network Layer (TNL) information of an F1-U interface,
• the TNL information comprises a transport layer IP address,
• the transport layer IP address is an IP address of the IAB node, and
• the transport layer IP address is allocated by a source donor node.

A non-transient computer readable storage medium having a computer program stored thereon, wherein the computer program, when executed by at least one processor, causing an apparatus to implement a method, comprising:

• receiving, by a target donor node from a source donor node, a handover request message;
• receiving, by the target donor node, rerouted data packets from an Integrated Access Backhaul (IAB) node;
• and
• forwarding, by the target donor node to the source donor node, the rerouted data packets based on information in the handover request message for the target donor node to forward data;
• wherein the information for the target donor node to forward the data comprises Transport Network Layer (TNL) information of an F1-U interface,
• the TNL information comprises a transport layer IP address,
• the transport layer IP address is an IP address of the IAB node, and
• the transport layer IP address is allocated by a source donor node.

A non-transient computer readable storage medium having a computer program stored thereon, wherein the computer program, when executed by at least one processor, causing an apparatus to implement a method, comprising:

• determining, by an Integrated Access Backhaul (IAB) node, rerouted data packets comprising data packets which have been transmitted by the IAB node to a next hop IAB node but for which no Radio Link Control Layer Protocol (RLC) acknowledgement feedback has been received from the next hop IAB node, and data packets having been subjected to RLC processing by the IAB node but having not been transmitted to the next hop IAB node;
• and
• transmitting, by the IAB node, the rerouted data packets to a target donor node according to information for the target donor node to forward data;
• wherein the information for the target donor node to forward the data comprises Transport Network Layer (TNL) information of an F1-U interface,
• the TNL information comprises a transport layer IP address,
• the transport layer IP address is an IP address of the IAB node, and
• the transport layer IP address is allocated by a source donor node.