System and method for construction of a protocol data unit using selective relay

An apparatus for wireless communication by a first device, the apparatus comprising:

• a memory;
• and
• at least one processor communicatively connected to the memory and configured to:
• receive, from a second device over a first communications link, a first bitmap indicating a first set of packets received by the second device from a third device over a second communications link;
• determine a second bitmap indicating a second set of packets received by the first device from the third device, each of the first set of packets and the second set of packets comprising at least a fragment of a protocol data unit (PDU);
• transmit, to the second device over the first communications link, information indicating a third set of packets based on the first bitmap and based on the second bitmap, the third set of packets being unsuccessfully received by the first device from the third device;
• and
• receive a fourth set of packets from the second device over the first communications link based on transmission of the information indicating the third set of packets, the fourth set of packets including information from the third set of packets,
• wherein, when the at least one processor determines that the PDU is fragmented, the second device is configured to obtain payloads of baseband fragments of the PDU and to include in the first bitmap information indicating, for each of the fragments, the payloads and fragment start values to enable the first device to reconstruct the PDU.

An apparatus for wireless communication by a first device, the apparatus comprising:

• means for receiving, from a second device over a first communications link, a first bitmap indicating a first set of packets received by the second device from a third device over a second communications link;
• means for determining a second bitmap indicating a second set of packets received by the first device from the third device, each of the first set of packets and the second set of packets comprising at least a fragment of a protocol data unit (PDU);
• means for transmitting, to the second device over the first communications link, information indicating a third set of packets based on the first bitmap and based on the second bitmap, the third set of packets being unsuccessfully received by the first device from the third device;
• and
• means for receiving a fourth set of packets from the second device over the first communications link based on transmitting the information indicating the third set of packets, the fourth set of packets including information from the third set of packets,
• wherein, when the PDU at the first device is fragmented, the second device obtains payloads of baseband fragments of the PDU and includes in the first bitmap information indicating, for each of the fragments, the payloads and fragment start values to enable the first device to reconstruct the PDU.

A non-transitory, computer-readable medium storing computer-executable code for wireless communication by a first device, the code, when executed by a processor, to cause the processor to:

• receive, from a second device over a first communications link, a first bitmap indicating a first set of packets received by the second device from a third device over a second communications link;
• determine a second bitmap indicating a second set of packets received by the first device from the third device, each of the first set of packets and the second set of packets comprising at least a fragment of a protocol data unit (PDU);
• transmit, to the second device over the first communications link, information indicating a third set of packets based on the first bitmap and based on the second bitmap, the third set of packets being unsuccessfully received by the first device from the third device;
• and
• receive a fourth set of packets from the second device over the first communications link based on transmission of the information indicating the third set of packets, the fourth set of packets including information from the third set of packets,
• wherein, when the PDU at the first device is fragmented, the second device obtains payloads of baseband fragments of the PDU and includes in the first bitmap information indicating, for each of the fragments, the payloads and fragment start values to enable the first device to reconstruct the PDU.