Communication control method

A communication control method used in a cellular communication system, the communication control method comprising:

• receiving, by a donor node, from a relay node information indicating that a Backhaul Adaptation Protocol (BAP) header rewriting function is supported;
• and
• performing, by the donor node, configuration related to inter topology routing to the relay node, wherein
• the relay node is located at a boundary between a first topology and a second topology, and
• the configuration includes information indicating that a routing ID of the second topology is adapted and a routing ID of the first topology not adapted.

A donor node in cellular communication system, the node comprising a receiver circuitry and a processing circuitry operatively associated with the receiver circuitry and configured to execute processing of:

• receiving from a relay node information indicating that a Backhaul Adaptation Protocol (BAP) header rewriting function is supported;
• and
• performing configuration related to inter topology routing to the relay node, wherein
• the relay node is located at a boundary between a first topology and a second topology, and
• the configuration includes information indicating that a routing ID of the second topology is adapted and a routing ID of the first topology not adapted.

A cellular communication system comprising:

• a relay node;
• and
• a donor node, wherein
• the relay node transmits to a donor node information indicating that a Backhaul Adaptation Protocol (BAP) header rewriting function is supported.

A cellular communication system comprising:

• a relay node;
• and
• a donor node, wherein
• the donor node receives from a relay node information indicating that a Backhaul Adaptation Protocol (BAP) header rewriting function is supported,
• the nonor node performs configuration related to inter topology routing to the relay node,
• the relay node is located at a boundary between a first topology and a second topology, and
• the configuration includes information indicating that a routing ID of the second topology is adapted and a routing ID of the first topology not adapted.

A non-transitory computer-readable storage medium storing a program for causing a computer in a donor node to execute processing comprising:

• receiving from a relay node information indicating that a Backhaul Adaptation Protocol (BAP) header rewriting function is supported;
• and
• performing configuration related to inter topology routing to the relay node, wherein
• the relay node is located at a boundary between a first topology and a second topology, and
• the configuration includes information indicating that a routing ID of the second topology is adapted and a routing ID of the first topology not adapted.

A chipset for a donor node in a cellular communication system, the chipset comprising:

• receiving from a relay node information indicating that a Backhaul Adaptation Protocol (BAP) header rewriting function is supported;
• and
• performing configuration related to inter topology routing to the relay node, wherein
• the relay node is located at a boundary between a first topology and a second topology, and
• the configuration includes information indicating that a routing ID of the second topology is adapted and a routing ID of the first topology not adapted.