Abstract: A communication device, that functions as a node connected to user equipment in an IAB (Integrated Access and Backhaul) network, performs: determining whether a type of a network slice requested by the user equipment is supported by a first other node connected above the communication device; determining, when the communication device determines that the type of the network slice is not supported by the first other node, whether at least one other node that can connect above the communication device, supports the type of the network slice is present; and, when the communication device determines that at least one other node that supports the type of the network slice is present, connecting to a second other node among the at least one other node that supports the type of the network slice.

Abstract: A communication apparatus comprises a generator configured to generate a header by a first method, and one or more computers for causing the apparatus to: obtain information of a window size from a communication partner apparatus; decide, based on the obtained information of the window size, a data size for a case of transmitting data to the communication partner apparatus; and if the decided data size exceeds a predetermined size, cause the generator to generate, by a first method, a header for data to be transmitted to the communication partner apparatus, and if the decided data size does not exceed the predetermined size, generate, by a second method different to the first method, a header for the data to be transmitted to the communication partner apparatus.

Abstract: A communication apparatus includes the first memory unit which stores data to be a sending target to another communication apparatus and the second memory unit accessible at higher speed than the first memory unit, and transfers the sending target data to the second memory unit concurrently with transfer of the data to the first memory unit. The communication apparatus sends the sending target data from the second memory unit to the other communication apparatus and discards the data from the second memory unit after that sending and before receiving a response to the data from the other communication apparatus. When resending the data, resending processing to the other communication apparatus is performed based on the data transferred to the first memory unit.

Abstract: A communication apparatus comprises a generator configured to generate a header by a first method, and one or more computers for causing the apparatus to: obtain information of a window size from a communication partner apparatus; decide, based on the obtained information of the window size, a data size for a case of transmitting data to the communication partner apparatus; and if the decided data size exceeds a predetermined size, cause the generator to generate, by a first method, a header for data to be transmitted to the communication partner apparatus, and if the decided data size does not exceed the predetermined size, generate, by a second method different to the first method, a header for the data to be transmitted to the communication partner apparatus.

Abstract: A communication apparatus includes the first memory unit which stores data to be a sending target to another communication apparatus and the second memory unit accessible at higher speed than the first memory unit, and transfers the sending target data to the second memory unit concurrently with transfer of the data to the first memory unit. The communication apparatus sends the sending target data from the second memory unit to the other communication apparatus and discards the data from the second memory unit after that sending and before receiving a response to the data from the other communication apparatus. When resending the data, resending processing to the other communication apparatus is performed based on the data transferred to the first memory unit.

Abstract: An encrypted communication apparatus determines a security protocol in IPsec to be applied to an IP packet, and calculates, based on the determined security protocol, a packet size which prevents the IP packet from being fragmented even if IPsec is applied to the IP packet. The packet size to be calculated is independent of an encryption algorithm and authentication algorithm which are actually specified by the determined security protocol.

Abstract: An encrypted communication apparatus determines a security protocol in IPsec to be applied to an IP packet, and calculates, based on the determined security protocol, a packet size which prevents the IP packet from being fragmented even if IPsec is applied to the IP packet. The packet size to be calculated is independent of an encryption algorithm and authentication algorithm which are actually specified by the determined security protocol.