System and method for hybrid automatic repeat request (HARQ) functionality in a relay node
Devices and methods related to relay nodes are provided. The relay node includes a first hybrid automatic repeat request (HARQ) entity providing a first HARQ functionality. The relay node further includes a second HARQ entity providing a second HARQ functionality.
1. A relay node comprising:
a first hybrid automatic repeat request (HARQ) entity providing a first HARQ functionality in connection with an access node; and
a second HARQ entity providing a second HARQ functionality in connection with a user agent.
2. The relay node of claim 1 , wherein the relay node device is configured to receive a medium access control packet data unit (MAC PDU) from the access node, wherein the first HARQ entity is configured to perform HARQ functionality with respect to the MAC PDU.
3. The relay node of claim 2 , wherein the relay node device is configured to avoid transmitting the MAC PDU to the user agent unless the MAC PDU is free of errors when received from the access node.
4. The relay node of claim 2 , wherein the relay node is configured to break apart the MAC PDU to create different transport block sizes (TBS).
5. The relay node of claim 4 , wherein transport block size depends on radio conditions.
6. The relay node of claim 2 , wherein the relay node is further configured to perform a cyclic redundant check (CRC) and to transmit a non-acknowledgement/acknowledgement (NACK/ACK) signal to the access node.
7. The relay node of claim 4 , wherein the relay node is further configured to schedule and send the MAC PDU to the user agent.
8. The relay node of claim 7 , wherein the relay node is configured to receive a non-acknowledgement/acknowledgement (NACK/ACK) signal from the user agent.
9. The relay node of claim 8 , wherein the relay node is further configured to maintain a fixed timing between transmission of the MAC PDU and the NACK/ACK.
10. The relay node of claim 1 , wherein the relay node is configured to receive a medium access control packet data unit (MAC PDU) from the user agent, and wherein the second HARQ entity is configured to perform HARQ functionality with respect to the MAC PDU.
11. The relay node of claim 10 , wherein the relay node is configured to break apart the MAC PDU to create different transport block sizes (TBS).
12. The relay node of claim 11 , wherein transport block size depends on radio conditions.
13. The relay node of claim 1 , wherein the relay node is a user equipment.
14. A device comprising:
a relay node configured to promote data communication between an access node and a user agent, wherein the relay node is further configured to:
receive a medium access control packet data unit (MAC PDU) from the access node;
demodulate and decode the MAC PDU without performing a cyclic redundancy check (CRC); and
forward the MAC PDU to the user agent without re-segmenting the MAC PDU.
15. The device of claim 14 , wherein the relay node is further configured to:
after receiving a non-acknowledgement/acknowledgement signal (NACK/ACK) from the user agent, forward the NACK/ACK to the access node;
after forwarding the NACK/ACK to the access node, receive a retransmission from the access node; and
forward the retransmission to the user agent.
16. A method implemented in a relay node comprising a first hybrid automatic repeat request (HARQ) entity having a first HARQ functionality, the method comprising:
receiving a medium access control packet data unit (MAC PDU) at the first HARQ entity; and
performing, with the first HARQ entity, a first HARQ functionality with respect to the MAC PDU.
17. The method of claim 16 , further comprising:
receiving the medium access control packet data unit (MAC PDU) from an access node or user agent.
18. The method of claim 17 , further comprising:
breaking apart the MAC PDU to create different transport block sizes (TBS).
19. The method of claim 18 , wherein transport block size depends on radio conditions.
20. The method of claim 18 , further comprising:
scheduling the MAC PDU; and
sending the MAC PDU.
21. The method of claim 20 , further comprising:
receiving a non-acknowledgement/acknowledgement (NACK/ACK) signal.
22. The method of claim 21 , further comprising:
responsive to receiving the non-acknowledgement signal (NACK), performing a hybrid automatic repeat request (HARQ) retransmission.
23. The method of claim 21 , wherein a retransmission is avoided when an ACK is received.
24. The method of claim 21 , further comprising;
maintaining a fixed timing between transmission of the MAC PDU and the NACK/ACK.
25. The method of claim 16 , wherein the relay node further comprises a second HARQ entity having a second HARQ functionality, the method further comprising:
transmitting the medium access control packet data unit (MAC PDU) to a user agent; and
the second HARQ entity performing second HARQ functionality with respect to the MAC PDU.
26. The method of claim 25 , wherein transmission of the MAC PDU to the user agent is avoided unless the MAC PDU is free of errors when received at the first HARQ entity.
27. The method of claim 16 , wherein the relay node is a user equipment.
28. A method implemented in a relay node that promotes data communication between an access node and a user agent, the method comprising:
receiving a medium access control packet data unit (MAC PDU) from the access node;
demodulating and decoding the MAC PDU without performing a cyclic redundancy check (CRC); and
forwarding the MAC PDU to the user agent without re-segmenting the MAC PDU.
29. The method of claim 28 , further comprising:
after receiving a non-acknowledgement/acknowledgement signal (NACK/ACK), forwarding the NACK/ACK signal;
after forwarding the NACK/ACK, receiving a retransmission; and
forwarding the retransmission.