Apparatus and method for supporting hybrid automatic repeat request in a broadband wireless communication system
A broadband wireless communication system using a plurality of Frequency Allocations (FAs) is provided. A method for packet transmission of a packet of a transmitting end includes dividing one encoded packet into a plurality of parts, mapping a plurality the plurality of parts of the packet to the FAs through the plurality of different FAs transmission, when a re-transmission request is received, re-mapping the plurality of parts of the packet to the FAs such that at least one of the at least one of the plurality of parts is re-mapped to an FA that is different than an FA previously mapped thereto. Retransmitting the encoded packet by at least one of a number of subunits.
1. A method for transmission of a packet using a plurality of Frequency Allocations (FAs) in a wireless Orthogonal Frequency Division Multiplexing (OFDM) communication system, the method comprising:
interleaving a packet to re-arrange each of a plurality of parts of the packet according to a first read-out order;
mapping the plurality of parts of the packet to at least one of the plurality of FAs based on a result of the interleaving;
when a re-transmission request is received, interleaving the packet to re-arrange each of the plurality of parts of the packet according to a second read-out order that is different from the first read-out order;
re-mapping the plurality of parts of the packet to at least one of the plurality of FAs based on a result of the interleaving for re-transmission such that at least one of the plurality of parts of the packet is re-mapped to an FA that is different than an FA previously mapped thereto; and
transmitting the re-mapped plurality of parts of the packet through the plurality of FAs at least one corresponding FA by using at least one of a plurality of radio frequency (RF) transmitters, each FA corresponding to a different RF transmitter such that parts of the packet that are transmitted through different FAs pass through different RF transmitters.
2. The method of claim 1 , wherein each of the plurality of parts of the packet constitute a symbol.
3. The method of claim 2 , wherein the re-mapping comprises:
reading out the symbols in the second read-out order; and
mapping the symbols to the corresponding FAs in the order of the read out of the symbols.
4. The method of claim 1 , wherein the interleaver is further configured to interleave the packet by:
writing the plurality of parts of the packet in a horizontal-axis direction in an interleaving buffer configured with matrix form; and
reading out the plurality of parts of the packet in a vertical-axis direction from the interleaving buffer.
5. The method of claim 4 , wherein the second read out order differs from the first read-out order in an order of column read out.
6. An apparatus for transmitting packet using a plurality of Frequency Allocations (FAs) in a wireless Orthogonal Frequency Division Multiplexing (OFDM) communication system, the apparatus comprising:
an interleaver configured to interleave a packet to re-arrange each of a plurality of parts of the packet according to a first read-out order;
at least one mapper configured to map the plurality of parts of the packet to at least one of the plurality of FAs based on a result of the interleaving; and
a plurality of transmitters, each of the plurality of transmitters configured to transmit the plurality of parts of the packet through a corresponding FA, each of the one or more FAs corresponding to a different RF transmitter such that parts of the packet that are transmitted through different FAs pass through different RF transmitters:
wherein the interleaver is further configured to, when a re-transmission request is received, interleave the packet to re-arrange each of the plurality of parts of the packet according to a second read-out order that is different from the first read-out order, wherein the at least one mapper is further configured to re-map the plurality of parts of the packet to at least one of the plurality of FAs based on a result of the interleaving for re-transmission such that at least one of the plurality of parts of the packet is re-mapped to an FA that is different than an FA previously mapped thereto, and transmitted using a corresponding transmitter.
7. The apparatus of claim 6 , wherein each of the plurality of parts of the packet constitute a symbol.
8. The apparatus of claim 7 , wherein the at least one mapper is further configured to read out the symbols in the second read-out order, and map the symbols to the at least one of the plurality of FAs in the order of the read out of the symbols.
9. The apparatus of claim 6 , wherein the interleaver is further configured to write the plurality of parts of the packet in a horizontal-axis direction in an interleaving buffer configured with matrix form, and read out the plurality of parts of the packet in a vertical-axis direction from the interleaving buffer.
10. The apparatus of claim 9 , wherein the second read out order differs from the first read-out order in an order of column read out.