METHOD AND APPARATUS FOR USING PHYSICAL LAYER ERROR CONTROL TO DIRECT MEDIA ACCESS LAYER ERROR CONTROL
In a system in which both the media access layer and the physical layer use error control, information from the physical layer error control process is used to provide surrogate media access layer error control messaging. In one aspect, the physical layer error control state machine in the transmitting station sends the surrogate message internally to the media access layer error control state machine based on physical layer error control results, thereby eliminating a need to transmit the error control messaging from the media access layer error control state machine of the receiving station over the wireless link.
1 . A method of transmitting data over a communication link using automatic repeat request (ARQ) and hybrid automatic repeat request (HARQ), the method comprising:
sending, by a local ARQ entity, one or more Protocol Data Units (PDUs) to a local HARQ entity;
receiving, by the local HARQ entity, the one or more PDUs from the local ARQ entity;
creating a HARQ packet from at least one of the one or more PDUs;
transmitting the HARQ packet over the communication link;
receiving over the communication link, by the local HARQ entity, a negative acknowledgement (NACK) of the HARQ packet;
sending, by the local HARQ entity to the local ARQ entity, an internal negative acknowledgement (internal NACK) identifying at least one of the one or more PDUs in the HARQ packet; and
re-sending, by the local ARQ entity to the local HARQ entity, at least one of the one or more PDUs identified in the internal NACK for re-transmission over the communication link.
2 . The method of claim 1 , wherein the receiving, over the communication link, the NACK of the HARQ packet includes receiving a bandwidth allocation for re-transmitting the HARQ packet.
3 . The method of claim 1 , further comprising:
sending the internal NACK to the local ARQ entity when the NACK has not been received over the communication link after a given amount of time following the transmission of the HARQ packet.
4 . The method of claim 1 , further comprising:
sending the internal NACK to the local ARQ entity when a positive acknowledgement (ACK) has not been received over the communication link after a given amount of time following the transmission of the HARQ packet.
5 . The method of claim 1 , further comprising:
stopping the re-sending of the at least one of the PDUs to the local HARQ entity by the local ARQ entity after a given number of retransmissions.
6 . The method of claim 5 , further comprising:
discarding, by the local ARQ entity, the at least one of the one or more PDUs indicated in the internal NACK if the given number of retransmissions is reached.
7 . The method of claim 1 , further comprising:
receiving, over the communication link, a positive acknowledgement (ACK) of the HARQ packet; and
sending at least one internal positive acknowledgement (internal ACK) to the local ARQ entity indicating at least one of the one or more PDUs in the HARQ packet.
8 . A wireless node comprising:
local automatic repeat request (ARQ) circuitry configured to send one or more Protocol Data Units (PDUs) to local hybrid automatic repeat request (HARQ) circuitry;
the local HARQ circuitry configured to receive the one or more PDUs from the local ARQ circuitry;
transmission circuitry configured to create a HARQ packet from at least one of the one or more PDUs and to transmit the HARQ packet over the communication link; and
receiving circuitry configured to receive, over the communication link, a negative acknowledgement (NACK) of the HARQ packet;
wherein the transmission circuitry is further configured to retransmit the HARQ packet on a condition that a NACK of the HARQ packet is received,
wherein the local HARQ circuitry is further configured to send at least one local NACK to the local ARQ circuitry identifying at least one of the one or more PDUs in the HARQ packet, and
wherein the local ARQ circuitry is configured to resend, to the local HARQ circuitry, at least one of the one or more PDUs identified in the at least one local NACK.
9 . The wireless node of claim 8 , wherein the local HARQ circuitry is further configured to send the at least one local NACK to the local ARQ circuitry identifying at least one of the one or more PDUs on the condition that a NACK had not been received over the communication link after a given amount of time following the transmission of the HARQ packet.
10 . The wireless node of claim 8 , wherein the local HARQ circuitry is further configured to send the at least one local NACK to the local ARQ circuitry identifying at least one of the one or more PDUs on the condition that a positive acknowledgement (ACK) had not been received over the communication link after a given amount of time following the transmission of the HARQ packet.
11 . The wireless node of claim 8 , wherein the local ARQ circuitry is configured to stop resending of the at least one of the one or more PDUs to the local HARQ circuitry after a given number of retransmissions.
12 . The wireless node of claim 11 , wherein the local ARQ circuitry is configured to discard the at least one of the one or more PDUs identified indicated in the internal NACK if the given number of retransmissions is reached.
13 . The wireless node of claim 11 , wherein the local HARQ circuitry is further configured to send at least one local ACK to the local ARQ circuitry identifying at least one of the one or more PDUs on the condition that a positive acknowledgement (ACK) had been received over the communication link following the transmission of the HARQ packet.