APPARATUS AND METHOD FOR HYBRID AUTOMATIC REPEAT REQUEST SIGNALING IN BROADBAND WIRELESS COMMUNICATION SYSTEM

• US 20080186886A1
• Filed: 02/05/2008
• Published: 08/07/2008
• Est. Priority Date: 02/05/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: SON, Jung-Je, CHO, Min-Hee, JANG, Jae-Hyuk, KIM, Nam-Gi
• Granted Patent: US 8,223,686 B2
• Time in Patent Office: Days
• US Class Current: 370/310
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint

Abstract

An apparatus and method for Hybrid Automatic Repeat reQuest (HARQ) signaling in a broadband wireless communication system are provided. A communication method of a Base Station (BS) includes transmitting a Fixed Allocation (FA) message containing bitmap index information for all Mobile Stations (MSs) allocated with fixed resources; and transmitting bitmap information indicating whether packets to be transmitted to the MSs are Retransmission (Rtx) packets or new packets. Accordingly, when HARQ is carried out using a fixed resource allocation scheme, a bitmap is used to indicate whether HARQ packets transmitted in a current frame are new packets or Rtx packets. Therefore, a receiving end can be prevented from incorrectly decoding the packets.

Claims

1. A communication method of a Base Station (BS) in a broadband wireless communication system, the method comprising:

transmitting a Fixed Allocation (FA) message containing bitmap index information for Mobile Stations (MSs) allocated with fixed resources; and

transmitting bitmap information indicating whether packets to be transmitted to the MSs are Retransmission (Rtx) packets or new packets.

2. The method of claim 1, wherein the FA message is transmitted in a start frame which fixed resource allocation is started.

3. The method of claim 1, wherein the FA message comprises at least one of an MS IDentification (ID), a region of a fixed resource, a bitmap index allocated to a MS, a coding scheme applied to the fixed resource, a duration for allocating the fixed resource, a start frame which fixed resource allocation is started, and an FA period.

4. The method of claim 1, wherein the transmitting of bitmap information comprises:

at every transmission time in accordance with an FA period, determining whether the packets to be transmitted to the MSs in a current frame are the Rtx packets or the new packets;

toggling a corresponding bit of the bitmap when the packets transmitted in the current frame are new packets, and maintaining the corresponding bit of the bitmap without alternation when the packets are Rtx packets; and

transmitting the updated bitmap in the current frame.

5. The method of claim 1, further comprising, at every transmission time in accordance with an FA period, transmitting the packets to the MSs by using the fixed allocated resources.

6. The method of claim 5, further comprising:

evaluating a response signal fed back from the MSs; and

determining whether a next packet to be transmitted to a corresponding MS is a new packet or an Rtx packet according to the response signal.

7. The method of claim 1, wherein the packets to be transmitted to the MSs are Hybrid Automatic Repeat reQuest (HARQ) packets.

8. A communication method of a Mobile Station (MS) in a broadband wireless communication system, the method comprising:

receiving, from a Base Station (BS), bitmap information indicating whether packets received via fixed allocated resources are Retransmission (Rtx) packets or new packets; and

determining whether a packet received in a current frame is an Rtx packet or a new packet by verifying a bit value of a bitmap index allocated to the MS.

9. The method of claim 8, wherein the bitmap information is periodically received at a Fixed Allocation (FA) period.

10. The method of claim 8, further comprising receiving an FA message containing information on a bitmap index allocated to the MS.

11. The method of claim 10, wherein the FA message is transmitted in a start frame which fixed resource allocation is started.

12. The method of claim 10, wherein the FA message comprises at least one of an MS IDentification (ID), a region of a fixed resource, a bitmap index allocated to a MS, a coding scheme applied to the fixed resource, a duration for allocating the fixed resource, a start frame which fixed resource allocation is started, and an FA period.

13. The method of claim 8, wherein the determining comprising:

verifying the bit value of the bitmap index allocated to the MS;

determining the packet received in the current frame to be an Rtx packet when the verified bit value is identical to a previous received bit value; and

determining the packet received in the current frame to be a new packet when the verified bit value is different from the previous received bit value.

14. The method of claim 8, further comprising:

performing decoding by combining the currently received packet with a previous received packet when the currently received packet is determined to be the Rtx packet; and

performing decoding by using only the currently received packet when the currently received packet is determined to be a new packet.

15. The method of claim 14, further comprising:

performing error checking according to the decoding result; and

feeding back the error checking result to the BS.

16. The method of claim 8, wherein the packets received via the fixed allocated resources are Hybrid Automatic Repeat reQuest (HARQ) packets.

17. The method of claim 8, further comprising, at every transmission time in accordance with an FA period, receiving a packet from the BS via the fixed allocated resource.

18. A Base Station (BS) apparatus in a broadband wireless communication system, the apparatus comprising:

a first generator for generating a Fixed Allocation (FA) message containing bitmap index information for Mobile Stations (MSs) allocated with fixed resources;

a second generator for transmitting bitmap information indicating whether packets to be transmitted to the MSs are Retransmission (Rtx) packets or new packets; and

a transmitter for transmitting messages received from the first generator and the second generator by performing physical layer encoding according to a scheduling result.

19. The apparatus of claim 18, wherein the transmitter transmits the FA message in a frame which fixed resource allocation is started.

20. The apparatus of claim 18, wherein the FA message comprises at least one of an MS IDentification (ID), a region of a fixed resource, a bitmap index allocated to a MS, a coding scheme applied to the fixed resource, a duration for allocating the fixed resource, a start frame which fixed resource allocation is started, and an FA period.

21. The apparatus of claim 18, further comprising:

a storage for storing the bitmap information; and

a scheduler for determining whether the packets to be transmitted to the MSs in a current frame are Rtx packets or new packets at every transmission time in accordance with an FA period, and toggling a corresponding bit of the bitmap when the packets transmitted in the current frame are new packets, and maintaining the corresponding bit of the bitmap without alternation when the packets are Rtx packets.

22. The apparatus of claim 18, wherein the transmitter transmits the packets to the MSs by using fixed allocated resources at every transmission time in accordance with an FA period.

23. The apparatus of claim 22, further comprising a retransmission controller for evaluating a response signal fed back from the MSs and for determining whether a next packet to be transmitted to a corresponding MS is a new packet or an Rtx packet according to the response signal.

24. The apparatus of claim 18, wherein the packets to be transmitted to the MSs are Hybrid Automatic Repeat reQuest (HARQ) packets.

25. A Mobile Station (MS) apparatus in a broadband wireless communication system, the apparatus comprising:

a receiver for receiving bitmap information indicating whether packet received via fixed allocated resource are Retransmission (Rtx) packet or new packet; and

a bitmap information reader for determining whether a packet received in a current frame is an Rtx packet or a new packet by verifying a bit value of a bitmap index allocated to the MS according to the bitmap information received from the receiver.

26. The apparatus of claim 25, wherein the bitmap information is periodically received at a Fixed Allocation (FA) period.

27. The apparatus of claim 25, further comprising a message reader for receiving an FA message containing information on a bitmap index allocated to the MS and for obtaining a bitmap index allocated to the MS by analyzing the FA message.

28. The apparatus of claim 27, wherein the FA message is transmitted in a start frame which fixed resource allocation is started.

29. The apparatus of claim 27, wherein the FA message comprises at least one of an MS IDentification (ID), a region of a fixed resource, a bitmap index allocated to a specific MS, a coding scheme applied to the fixed resource, a duration for allocating the fixed resource, a start frame which fixed resource allocation is started, and an FA period.

30. The apparatus of claim 25, wherein the bitmap reader determines the packet received in the current frame to be an Rtx packet when the verified bit value is identical to a previous received bit value, and determines the packet received in the current frame to be a new packet when the verified bit value is different from the previous received bit value.

31. The apparatus of claim 25, further comprising a decoder for performing decoding by combining the packets when the currently received packet is determined to be an Rtx packet, and performing decoding by using only the currently received packet when the currently received packet is determined to be a new packet.

32. The apparatus of claim 31, further comprising:

an error checker for checking errors in the decoded data obtained from the decoder; and

a feedback generator for feeding back the error checking result obtained from the error checker to the BS.

33. The apparatus of claim 25, wherein the packets received via the fixed allocated resource are Hybrid Automatic Repeat reQuest (HARQ) packet.

34. The apparatus of claim 25, wherein the receiver receives a packet from the BS via the fixed allocated resource at every transmission time in accordance with an FA period.