Method for reporting reception result of packets in mobile communication system

• US 20060034277A1
• Filed: 08/12/2005
• Published: 02/16/2006
• Est. Priority Date: 08/13/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jang, Kyung-Hun, Lee, Dong-Jun, Kim, Young-Soo, Park, Jong-Ae, Chang, Jin-Bong
• Granted Patent: US 7,599,363 B2
• Time in Patent Office: Days
• US Class Current: 370/389
• CPC Class Codes: H04L 1/1614 using bitmaps

Abstract

Disclosed is a bitmap structure which enables the size of a bitmap field containing reception result information to be significantly reduced while fully performing its acknowledgment function. To this end, a message region for recording indicators, which enables reception success or failure for the maximum allowable SN level packets treatable by block ACK to be confirmed, is assigned. A message region for recording only the reception results for unsuccessfully received packets is also assigned. A receiving party confirms the unsuccessfully received packets through the indicators, and retransmits the unsuccessfully received packets. Also, a transmitting party provides the number of SN level packets and the maximum number of fragmentation packets to the receiving party. The receiving party determines an optimized bitmap configuration scheme, and transmits the reception results for the respective fragmentation packets to the transmitting party based on the determined bitmap configuration scheme.

Claims

1. A method for configuring a reception result reporting message for reporting to a transmitter reception results for packets in a receiver of a mobile communication system in which a plurality of packets to be consecutively transmitted are transmitted by being divided into a plurality of fragmentation packets, the method comprising the steps of:

storing indicators, each of which indicates reception success or failure for each of the packets, in a first bitmap field of the reception result reporting message; and

creating a second bitmap field, in which reception results corresponding to unsuccessfully received packets of the packets will be stored, in the reception result reporting message, and storing indicator bits, each of which indicates reception success or failure for each of the fragmentation packets of the unsuccessfully received packets, in the second bitmap field.

2. The method as claimed in claim 1, wherein the number of indicators recorded in the first bitmap field is determined by the number of consecutively received packets.

3. The method as claimed in claim 2, wherein if even one fragmentation packet of the fragmentation packets divided from the received packets is unsuccessfully received, the indicators corresponding to the received packets are set as a value indicating reception failure.

4. The method as claimed in claim 1, wherein the number of second bitmap fields is determined by the number of unsuccessfully received packets.

5. The method as claimed in claim 4, wherein the number of indicator bits recorded in the second bitmap field is determined by the maximum number of fragmentation packets divided from one packet.

6. The method as claimed in claim 3, wherein from among the indicator bits in the second bitmap field, the indicator bits corresponding to the unsuccessfully received fragmentation packets are set as a value indicating reception failure.

7. The method as claimed in claim 1, wherein the reception result reporting message is further provided with a field for recording the foremost sequence number (SN) of the SNs which are included in the received packets.

8. A method for retransmitting packets in response to a reception result reporting message from a receiver in a transmitter of a mobile communication system in which a plurality of to be consecutively transmitted are transmitted by being divided into a plurality of fragmentation packets, the method comprising the steps of:

determining if unsuccessfully received packets exist by analyzing indicators of the respective plural packets, which are recorded in a first bitmap field of the reception result reporting message;

identifying unsuccessfully received fragmentation packets corresponding to the unsuccessfully received packets by analyzing indicator bits which exist in a second bitmap field of the reception result reporting message; and

retransmitting one of the unsuccessfully received fragmentation packets and the packets including the unsuccessfully received fragmentation packets.

9. The method as claimed in claim 8, wherein the number of indicators recorded in the first bitmap field is equal to the number of the plurality of packets.

10. The method as claimed in claim 9, wherein if even one fragmentation packet of the fragmentation packets divided from the received packets corresponding to the indicators of the first bitmap field is unsuccessfully received, the indicators are set as a value indicating reception failure.

11. The method as claimed in claim 8, wherein the number of second bitmap fields is equal to the number of unsuccessfully received packets.

12. The method as claimed in claim 11, wherein the number of indicator bits of the second bitmap field is equal to the maximum number of fragmentation packets divided from one packet.

13. The method as claimed in claim 8, wherein the reception result reporting message is further provided with a field for recording therein the foremost SN of the SNs which are included in the plural packets.

14. A method for configuring bitmaps in a mobile communication system, the method comprising the steps of:

receiving information about the number of consecutively received packets and the maximum number of fragmentation packets; and

determining a bitmap configuration scheme based on the information about the number of consecutively received packets and the maximum number of fragmentation packets.

15. The method as claimed in claim 14, wherein the overall bitmap size for determining the bitmap configuration scheme is calculated by the following equation:

Overall bitmap size=ceiling [m×

n/8]octets

where ceiling [x] denotes a minimum integer from among integers exceeding ‘

x’

, m is the number of consecutively received packets, and n is the number of fragmentation packets.

16. The method as claimed in claim 15, wherein the bitmap size corresponding to each of the consecutively received packets is determined as n bits.

17. The method as claimed in claim 16, wherein out of bits corresponding to the overall bitmap size, the bits corresponding to the number of bits calculated by the following equation are padding-processed:

ceiling [m×

n/8]×

8−

m×

n

wherein ceiling [x] denotes a minimum integer from among integers exceeding ‘

x’

.

18. A method for requesting reception results for transmitted packets in a mobile communication system, the method comprising the steps of:

consecutively transmitting a number of packets (m) while the respective packets are divided into one or more fragmentation packets; and

transmitting information about the number of consecutively transmitted packets (m) and the number of fragmentation packets (n).

19. The method as claimed in claim 18, wherein after the information about the number of consecutively transmitted packets (m) and the number of fragmentation packets (n) are transmitted, the fragmentation packets are transmitted.

20. The method as claimed in claim 18, wherein after the fragmentation packets are transmitted, the information about the number of consecutively transmitted packets (m) and the number of fragmentation packets (n) are transmitted.

21. A method for reporting reception results for received packets in a mobile communication system, the method comprising the steps of:

consecutively receiving m packets divided into one or more fragmentation packets;

receiving information about the number of consecutively received packets (m) and the number of fragmentation packets (n);

determining a bitmap configuration scheme based on the information about the number of consecutively received packets (m) and the number of fragmentation packets (n);

configuring the bitmaps including reception results for the respective fragmentation packets by the determined bitmap configuration scheme; and

transmitting the bitmaps.

22. The method as claimed in claim 21, wherein the overall bitmap size for determining the bitmap configuration scheme is calculated by the following equation:

Overall bitmap size=ceiling [m×

n/8]octets

wherein ceiling [x] denotes a minimum integer from among integers exceeding ‘

x’

, m is the number of consecutively received packets, and n is the number of fragmentation packets.

23. The method as claimed in claim 22, wherein the bitmap size corresponding to each of the consecutively received packets is determined as n bits.

24. The method as claimed in claim 23, wherein reception results (k bits) for k fragmentation packets divided from the respective received packets are recorded in a corresponding n-bit bitmap, and ‘

0’

is recorded in the remaining bits when k is smaller than n.

25. The method as claimed in claim 23, wherein out of bits corresponding to the overall bitmap size, the bits corresponding to the number of bits calculated by the following equation are padding-processed:

ceiling [m>

n/8]×

8−

m×

n

wherein ceiling [x] denotes a minimum integer from among integers exceeding ‘

x’

.

26. The method as claimed in claim 22, wherein the bitmaps corresponding to the packets are arranged at intervals of n bits within the overall bitmap.