Provided is a communication device in which communication between hosts of a layer 2 network is overlaid on a layer 3 network. The communication device manages a first MTU length of each communication path with respect to a plurality of communication paths in the layer 3 network, determines a second MTU length based on information to be added in cases where communication between the hosts of the layer 2 network is overlaid via the plurality of communication paths, and notifies the hosts of the second MTU length.

According to a disclosed embodiment, a flow indication counter is incremented each time a data packet is transmitted from a buffer. When the number of data packets transmitted equals or exceeds a threshold number, a flow indication message comprising the buffer window size is generated and transmitted to the base station controller. Further, flow indication messages can be generated and transmitted every threshold time interval, independently of the number of data packets transmitted to ensure that flow indication messages are sent at least every preset time interval. Moreover, a system for flow control can be constructed comprising a flow indication counter module configured to provide an updated number of data packets transmitted. The system further comprises a window size monitoring module which determines the buffer window size and a message generating module which generates a flow indication message comprising the buffer window size.

A method for discovering a PMTU, applicable to a destination node of a path, includes: receiving fragment packets from a source node of the path; determining a detecting range based on a maximum length and a minimum fragment unit of the fragment packets; selecting a detecting value within the detecting range in accordance with a predetermined strategy, requesting the source node to respond with a response packet of a length equal to the detecting value, and determining a PMTU of the path based on whether the response packet from the source node is fragmented.

Methods, systems, and devices are described for wireless communications. A recipient device may receive a session initiation request from an originator device. The recipient device may support a first fragmentation configuration that supports inclusion of multiple data fragments per transmission data unit. The recipient device may determine to use a second fragmentation configuration in place of the first fragmentation configuration, where the second fragmentation configuration supports inclusion of fewer data fragments per transmission data unit than that supported by the first fragmentation configuration. The recipient device may then transmit a session initiation response indicating use of the second fragmentation configuration.

A method for downloading a file for use in a first mobile terminal, includes: determining at least one second mobile terminal, connected with the first mobile terminal, as a receiving mobile terminal; sending a request for splitting and downloading a file for a server to split the file into a plurality of subfiles and send at least one of the plurality of subfiles to the receiving mobile terminal; after the receiving mobile terminal completes receiving of the subfile, acquiring the subfile from the receiving mobile terminal; and after all of the plurality of subfiles are acquired, combining the plurality of subfiles into the file and saving the file.

In some examples, a maximum transmission unit (MTU) is installed by a Software-Defined Network (SDN) controller on a controlled network node for traffic along a datapath in an SDN. The installed MTU can, for example, be selected from MTU sizes in an MTU database for nodes along the datapath. For example, the installed MTU can be selected as the largest allowable MTU size based on the nodes of the datapath.

The disclosure provides a terminal device, and frame sending and receiving methods, which relate to the field of communications. The terminal device includes: a confirming component configured to send a broadcast control frame to another terminal device which supports a Wireless Fidelity (Wi-Fi) direct-connecting technology, and confirm that the another terminal device which replies a broadcast response frame supports dynamic frame interaction after receiving the broadcast response frame replied by the another terminal device; and a scanning component configured to send a scanning request frame to the another terminal device which supports the dynamic frame interaction, wherein the field indicating the address of the receiving end in the scanning request frame is null. The length of the frames are greatly reduced by dynamically and self-adaptively adjusting the lengths of interaction frames for the frames in a scanning phase, a discovery phase and an operating phase respectively, thereby effectively solving the problem of power consumption; and meanwhile, a simple physical-connecting solution can be realized, and therefore devices which support Wi-Fi direct-connecting can simply interact with one another.

A method of control Maximum Transmission Unit (MTU) reporting and discovery using AT commands is proposed. In communications networks, the MTU of a communication protocol of a layer is the size (in bytes or octets) of the largest protocol data unit that the layer can pass onwards. In an IP network, IP packets may be fragmented if the supported MTU size is smaller than the packet length. In accordance with one novel aspect, the packet data protocol (PDP) context of a packet data network (PDN) connection comprises MTU information. By introducing MTU information to the PDP contexts, TE can use AT commands to query MTU parameters from the network and thereby avoid fragmentation. TE can also use AT command to set MTU parameters and thereby control MTU discovery.

The present invention relates to packet-switched networks, such as Ethernet, and more particularly to a method for traffic shaping of data frames to transmit in such a telecommunication network, the frames to transmit being distinguished between: express frames, needing to be sent within predetermined time windows, and normal frames, intended to be sent at times outside said time windows. More particularly, for a current normal frame, the method comprises the steps of: determining whether said normal frame can be fragmented, and if yes: determining whether a remaining time to a next time window opening is enough to transmit one or several fragments of said normal frame, and if yes: transmitting said one or several fragments.

Disclosed are a device for transmitting a data unit and a method of operating the same. More particularly, the device of the present disclosure includes a size determination unit for determining an optimal split size for a MAC Service Data Unit (MSDU) received from an upper layer by applying a transmission time algorithm; a unit division unit for splitting the MSDU into the determined size; and a MAC layer management unit for generating plural MAC Protocol Data Units (MPDUs) based on the split plural MSDUs and the delimiter for each of the split plural MSDUs, generating an aggregate protocol data unit by applying an aggregate transmission scheme to the generated MPDUs, and delivering the generated aggregate protocol data unit to a physical layer, thus guaranteeing reliability important for video streaming and, at the same time, increasing the throughput.