Abstract:
PURPOSE: An indirect acknowledgement method for a snoop protocol according to the transmission delay of a radio link and a packet transmission apparatus in a wired and wireless communication network for performing the same are provided to reduce the generation probability of retransmission time excess capable of being generated in a transmission terminal and efficiently use wired resources by adding an indirect acknowledgement function in a base station for indirectly acknowledging a packet. CONSTITUTION: It is judged whether a received data packet is a new data packet whenever the data packet is received from a transmission terminal. It is judged whether a buffer, which stores the received data packet, satisfies a specific limit condition. If the received data packet is the new data packet and the buffer satisfies the specific limit condition, an indirect acknowledgement timer about the received data packet is set up. It is judged whether an acknowledgement packet is repeated whenever the acknowledgement packet is received from a reception terminal(42,44,52,56). It is judged whether the buffer satisfies the specific limit condition(60). If the acknowledgement packet is a primary repetition acknowledgement packet and the buffer satisfies the specific limit condition, the indirect acknowledgement timer generates an indirect acknowledgement packet about a finally set data packet and transmits the indirect acknowledgement packet to the transmission terminal(64).
Abstract:
PURPOSE: A data block transmitting method and a transmitter using the same are provided to apply in a wireless network environment and to prevent the waste of unnecessary channels. CONSTITUTION: A wireless device includes a processor(51), a memory(52) and an RF(Radio Frequency) unit. The processor implements a function of a transmitter, performs transmission or retransmission of a frame, and manages a retransmission counter. The memory stores a parameter for operating the processor inside or outside the processor and is connected with the processor. The RF unit transmits or receives a radio signal. [Reference numerals] (51) Processor; (52) Memory; (53) RF unit
Abstract:
PURPOSE: A transmitting method and a transmitter thereof are provided to transmit a frame by grouping a plurality of wireless terminals. CONSTITUTION: A transmitter transmits a group management frame to a receiver. The group management frame includes bitmap information indicating whether the receiver is a member of one or more of groups. The transmitter transmits a data frame to the receiver. The data frame includes group control information and a group identifier. The group control information includes stream information. [Reference numerals] (AA) NAV protection