Multi-mode hybrid ARQ scheme
View Patent ↗A method and apparatus for performing H-ARQ transmission is described herein. Bits received on a first transmission are stored and combined with the bits received on later transmissions thereby increasing the likelihood of a correct decoding on later transmissions. Additionally, a plurality of coding schemes (e.g., Convolutional Codes, Block Turbo Codes, Convolutional Turbo Codes, Low Density Party Check Codes, . . . , etc.) are utilized, with an information element being reserved to signal what form of H-ARQ is being utilized.
1. A method for performing hybrid automatic repeat request (H-ARQ), the method comprising the steps of:
determining a DL-MAP Type, DL-MAP Sub-Type, Length, and an H-ARQ mode, wherein DL-MAP Type specifies a type of information element and DL-MAP Sub-Type specifies an extended map type as H-ARQ mode switch;
transmitting a message to a receiver indicating the DL-MAP Type, DL-MAP Sub-Type, Length, and the H-ARQ mode; and
transmitting an H-ARQ packet using the H-ARQ mode.
2. The method of claim 1 wherein:
the step of transmitting the message comprises the step of transmitting the message as an 802.16 Information Element (IE), wherein the IE comprises the DL-MAP Type, DL-MAP Sub-Type, Length, and H-ARQ mode.
3. The method of claim 1 wherein the step of transmitting the message comprises the step of transmitting an IEEE 802.16 switch-mode information element (IE) containing the H-ARQ mode.
4. The method of claim 1 wherein the step of determining the H-ARQ mode being utilized comprises the step of determining the FEC coding modes and H-ARQ retransmission schemes supported by the receiver.
5. The method of claim 1 further comprising the step of:
determining an H-ARQ mode being utilized.
6. The method of claim 5 wherein the step of determining the H-ARQ mode being utilized comprises the step of determining the H-ARQ mode being utilized based on a generic Chase combining or Incremental Redundancy encoding.
7. The method of claim 1 wherein the H-ARQ mode being utilized is based on Chase Combining or Incremental Redundancy.
8. An apparatus comprising:
an encoder encoding data;
logic circuitry determining a type of H-ARQ based on a type of encoding being used by the encoder; and
a transmitter transmitting a message over the air to a receiver indicating the type of H-ARQ, wherein the message comprises a DL-MAP Type, a DL-MAP Sub-Type, a Length, and the type of H-ARQ, wherein DL-MAP Type specifies a type of information element and DL-MAP Sub-Type specifies an extended map type as H-ARQ mode switch.
9. The apparatus of claim 8 wherein the type of encoding being utilized comprises generic Chase combining or Incremental Redundancy.
10. The apparatus of claim 8 wherein the message comprises an IEEE 802.16 switch-mode information element (IE) containing the H-ARQ mode.