1. A method for transmitting data in a transmitting device, the method comprising:
receiving a plurality of service data units (SDUs) from an upper layer;
combining the plurality of SDUs to generate a medium access control (MAC) protocol data unit (PDU) payload;
adding a MAC header to the generated MAC PDU payload to generate a MAC PDU,
wherein the MAC header comprises an identifier and a sequence number,
wherein the identifier is common to the plurality of SDUs and is used for indicating a corresponding reordering buffer of a receiving device in which the MAC PDU is to be stored,
wherein the corresponding reordering buffer of the receiving device is configured according to the identifier; and
transmitting the generated MAC PDU.
2. The method of claim 1, further comprising retransmitting the generated MAC PDU if an acknowledge message is not received in an acknowledge mode.
3. The method of claim 2, wherein one transmission buffer exists per each identifier.
4. The method of claim 1, wherein the generated MAC PDU is stored in a transmission buffer.
5. The method of claim 4, wherein the generated MAC PDU is deleted from the transmission buffer upon receiving an acknowledgement message.
6. An apparatus for transmitting a plurality of service data units (SDUs) in a communication system, the apparatus comprising:
a receiving unit for receiving a plurality of SDUs from an upper layer;
a combining unit for combining the plurality of SDUs and adding a medium access control (MAC) header to the combined plurality of SDUs to generate a MAC PDU, wherein the MAC header comprises an identifier used to map the combined plurality of SDUs to a corresponding reordering buffer;
a transmission buffer for storing the generated MAC PDU; and
a transmitting unit for transmitting the MAC PDU,
wherein the identifier is common to the plurality of SDUs, and
wherein the corresponding reordering buffer is configured according to the identifier.
7. The apparatus of claim 6, further comprising a retransmitting unit for retransmitting the generated MAC PDU if an acknowledge message is not received in an acknowledge mode.
8. The apparatus of claim 6, wherein one transmission buffer exists per each identifier.
9. The apparatus of claim 8, wherein the generated MAC PDU is deleted from the transmission buffer upon receiving an acknowledgement message.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A vacuum cleaner, comprising:
a suction nozzle that draws in polluted air through operation of a motor;
a dust collecting assembly that separates and collects impurities from the polluted air, wherein the dust collecting assembly includes:
a dust collecting container that has a dust collecting space formed therein;
a polluted air inlet that directs polluted air into the dust collecting container;
a clean air outlet that directs clean air out of the dust collecting container;
an anti-rotation plate provided in the dust collecting container, wherein the anti-rotation plate extends upward from a lower portion of the dust collecting container so as to prevent impurities collected in the dust collecting container from being rotated by air flowing in a spiral in the dust collecting container; and
a filtering device positioned in the dust collecting container, wherein the filtering device filters impurities from the polluted air;
a main body, including:
a dust collecting assembly receiving groove that receives the dust collecting assembly;
a polluted air outlet coupled to the polluted air inlet of the dust collecting assembly, wherein the polluted air outlet discharges polluted air drawn in through the suction nozzle into the dust collecting assembly; and
a clean air inlet provided on an inner rear wall of the dust collecting assembly receiving groove, facing a rear wall of the dust collecting assembly, wherein the clean air inlet is in communication with the clean air outlet of the dust collecting assembly so as to receive clean air discharged from the dust collecting assembly;
an inner flow tube coupled to the clean air outlet of the dust collecting assembly and extending toward the filtering device so as to form a passage through which clean air is discharged from the filter device to the clean air outlet of the dust collecting assembly, wherein the anti-rotation plate extends between an outer wall of the inner flow tube and an inner wall of the dust collecting container; and
a packing member provided between the clean air inlet of the main body and the clean air outlet of the dust collecting assembly so as to maintain airtightness therebetween, wherein the packing member comprises:
a packing body portion inserted in and coupled to the clean air inlet of the main body; and
an elastic member coupled to an inner side of the packing body and closely adhered to the clean air outlet of the dust collecting assembly, wherein the elastic member is configured to filter impurities from air passing therethrough.
2. The vacuum cleaner as claimed in claim 1, wherein the inner flow tube includes a first portion coupled to the clean air outlet of the dust collecting assembly, and a second portion that extends along a center line of the dust collecting container so as to form a passage through which clean air is discharged from the dust collecting space.
3. The vacuum cleaner as claimed in claim 2, wherein the inner flow tube comprises:
a first flow tube that extends horizontally from the clean air outlet of the dust collecting assembly outlet to a lower central portion of the dust collecting container;
a second flow tube that extends upward from the lower central portion of the dust collecting container to a predetermined height within the dust collecting container; and
a flow tube coupler that extends between the first flow tube and the second flow tube so as to connect the first and second flow tubes.
4. The vacuum cleaner as claimed in claim 3, wherein the flow tube coupler is curved or inclined so as to minimize flow resistance of the clean air discharged thereto from the dust collecting container.
5. The vacuum cleaner as claimed in claim 1, wherein the dust collecting assembly further comprises a lid that opens and closes an upper portion of the dust collecting container.
6. The vacuum cleaner as claimed in claim 5, wherein the filtering device is detachably coupled to the lid so as to filter impurities from the polluted air.
7. The vacuum cleaner as claimed in claim 6, wherein the dust collecting assembly further comprises a shielding plate coupled to a lower end of the filtering device, wherein the shielding plate prevents impurities collected at a lower portion of the dust collecting container from being drawn upwards by air flow in the dust collecting container.
8. The vacuum cleaner as claimed in claim 7, wherein the shielding plate is formed in a skirt form.
9. The vacuum cleaner as claimed in claim 5, wherein the polluted air inlet of the dust collecting assembly is provided at a predetermined position on a side of the dust collecting container such that polluted air, drawn into the dust collecting container through the polluted air inlet, forms a spiral flow within the dust collecting container.
10. The vacuum cleaner as claimed in claim 1, wherein the filtering device comprises:
a hollow filter that filters microscopic dust from the polluted air; and
a filter supporter that supports the filter.
11. The vacuum cleaner as claimed in claim 10, wherein the polluted air inlet of the dust collecting assembly comprises a guide plate that guides polluted air in a tangential direction along an inner wall of the dust collecting container.
12. The vacuum cleaner as claimed in claim 1, wherein the dust collecting assembly further comprises a pair of projections that project outward from an outer wall of the dust collecting container and are closely fitted to the dust collecting assembly receiving groove so as to position and secure the dust collecting container to the main body.
13. The vacuum cleaner as claimed in claim 12, wherein the main body further comprises a pair of projection receiving grooves each having a predetermined depth and being provided at a front end of the dust collecting assembly receiving groove so as to receive the pair of projections of the dust collecting assembly.
14. The vacuum cleaner as claimed in claim 1, wherein the packing member is formed in a mesh form so as to filter impurities from air passing therethrough.