Acknowledgement message modification in communication networks
A method for processing a received encoded data unit comprises: decoding the received encoded data unit; determining whether the encoded data unit has been correctly received; prior to completing the determination of whether the encoded data unit has been correctly received, initiating the transmission of an acknowledgment message; and modifying the transmission of the acknowledgment message if it is determined that the data unit has not been correctly received. In another embodiment, a station for a communications network comprises: a decoder adapted to decode a received encoded data unit; a check processor adapted to determine whether the encoded data unit has been correctly received; and a transmitter adapted to initiate the transmission of an acknowledgment message prior to the check processor completing the determination whether the encoded data unit has been correctly received. The transmitter is adapted to modify the transmission of the acknowledgment message if the check processor determines that the data unit has not been correctly received.
1. A method for processing a received encoded data unit, the method comprising:
decoding the received encoded data unit;
determining whether the encoded data unit has been correctly received;
prior to completing the determination of whether the encoded data unit has been correctly received, initiating the transmission of an acknowledgment message comprising a frame having a plurality of different fields of data; and
modifying the transmission of the acknowledgment message if it is determined that the data unit has not been correctly received.
2. The method of claim 1 , wherein the step of modifying the transmission of the acknowledgment message comprises terminating the transmission of the acknowledgment message without transmitting the entire frame.
3. The method of claim 1 , wherein:
the step of determining whether the encoded data unit has been correctly received comprises a step of determining that the encoded data unit has not been correctly received; and
the step of modifying the transmission of the acknowledgment message comprises altering a portion of the contents of the frame responsive to determining that the data unit has not been correctly received.
4. The method of claim 3 , further comprising transmitting the altered portion of the frame.
5. The method of claim 3 , wherein the altered portion comprises a destination address field.
6. The method of claim 5 , wherein the alteration comprises replacing the true destination address field with a dummy address.
7. The method of claim 5 , wherein the alteration comprises replacing the true destination address in the destination address field with the address of the station receiving the encoded data unit.
8. The method of claim 5 , wherein the alteration comprises replacing a checksum value in a field used for a cyclic redundancy check (CRC).
9. The method of claim 3 , further comprising:
storing the altered portion in memory as a time sample;
wherein the step of modifying the transmission of the acknowledgment message comprises transmitting the altered portion of the acknowledgment message from its stored location.
10. The method of claim 9 , further comprising:
storing an unaltered portion of an acknowledgment message in memory as a time sample; and
transmitting the unaltered portion from its stored location if the encoded data unit has been correctly received.
11. The method of claim 1 , wherein:
the encoded data unit is transmitted at a first station and received at a second station; and
the first and second stations are connected via a wireless network.
12. The method of claim 11 , wherein the data unit is a MIMO-encoded packet.