Method and system for acknowledging the receipt of a transmitted data stream in a wireless communication system

• US 7,161,909 B2
• Filed: 04/23/2004
• Issued: 01/09/2007
• Est. Priority Date: 04/23/2004
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Sharma, Sanjeev K.
• Primary Examiner(s): Ngo; Ricky Q.
• Assistant Examiner(s): CHANG, RICHARD K
• Application Number:
  US10/830,990
• Publication Number:
  US 20050238054A1
• Time in Patent Office: 991 Days
• Field of Search: 370/235, 370/236, 370/338, 370/352, 370/394, 370/473, 455/510, 455/517
• US Class Current: 370/235
• CPC Class Codes: H04L 1/1614 using bitmaps
• CPC Class Codes: H04L 1/1642 Formats specially adapted for sequence numbers
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method and system for acknowledging the receipt of a transmitted data stream in a wireless local area network (WLAN) are disclosed. One aspect of the invention provides a system and method of acknowledging the receipt of a transmitted data stream in a wireless local area network, wherein the system sends a single acknowledgement to the transmitting party after all of the fragment packets, which belong to a sequence, are received in the receiving party. Another aspect of the invention provides a system and method of confirming the receipt of a transmitted data stream in a wireless local area network, wherein the system transmits a plurality of fragment packets without waiting for an acknowledgement for each fragment packet from the receiving party.

Claims

1. A method of acknowledging the receipt of a transmitted data stream in a wireless local area network (WLAN), the method comprising:

transmitting a plurality of packets from a transmitting entity to a receiving entity, each packet being fragmented into a plurality of fragment packets, wherein the plurality of fragment packets form a sequence having a sequence number and each of the plurality of fragment packets has a fragment number, wherein the fragment numbers are sequentially numbered but the sequence number remains the same and wherein the fragment packets are transmitted in the order of the fragment numbers;

determining whether the last fragment packet of the sequence is received in the receiving entity; and

sending an acknowledgement packet from the receiving entity to the transmitting entity only after it has been determined that the last fragment packet has been received by the receiving entity,

wherein each of the fragment packets includes a frame control section and a sequence control section, and wherein the determining comprises checking a more fragments field of the frame control section and checking a fragment number field and a sequence number field of the sequence control section so as to determine whether the last fragment packet of the sequence has been received.

2. The method of claim 1, wherein the wireless local area network follows the protocol of one of the IEEE 802.11a/11b/11g standards.

3. A method of acknowledging the receipt of a transmitted data stream in a wireless local area network (WLAN), the method comprising;

receiving a plurality of packets from a transmitting entity, each packet being fragmented into a plurality of fragment packets, wherein the plurality of fragment packets form a sequence having a sequence number and each of the plurality of fragment packets has a fragment number, wherein the fragment numbers are sequentially numbered but the sequence number remains the same and wherein the fragment packets are received in the order of the fragment numbers;

determining whether the last fragment packet of the sequence is received; and

sending an acknowledgement packet to the transmitting entity only after it has been determined that the last fragment packet has been received,

wherein each of the fragment packets includes a frame control section and a sequence control section, and wherein the determining comprises checking a more fragments field of the frame control section and checking a fragment number field and a sequence number field of the sequence control section so as to determine whether the last fragment packet of the sequence has been received.

4. The method of claim 3, wherein the method is performed in a receiving station.

5. The method of claim 3, further comprising determining whether all fragment packets of the sequence are received.

6. The method of claim 5, wherein if one or more of the fragment packets are not received, the acknowledgement packet includes information indicative of which fragment packets of the sequence are not received.

7. The method of claim 6, wherein the information is defined by a bitmap section of the acknowledgement packet.

8. A method of acknowledging the receipt of a transmitted data stream in a wireless local area network (WLAN), the method comprising:

receiving a plurality of MAC service data units (MSDUs) from a transmitting entity, each MSDU comprising a plurality of MAC protocol data units (MPDUs), wherein the plurality of MPDUs form a sequence having a sequence number and each of the MPDUs has a fragment number, wherein the fragment numbers are sequentially numbered but the sequence number remains the same, and wherein the MPDUs are received in the order of the fragment numbers;

determining whether the last MPDU of the sequence is received; and

sending an acknowledgement frame to the transmitting entity only after it has been determined that the last MPDU has been received,

wherein each MPDU includes a frame control section and a sequence control section, and wherein the determining comprises checking a more fragments field of the frame control section and checking a fragment number field and a sequence number field of the sequence control section so as to determine whether the last MPDU of the sequence has been received.

9. The method of claim 8, wherein the method is performed in either an access point or a receiving station.

10. The method of claim 8, further comprising:

determining whether all MPDUs of the sequence are received; and

sending a NACK frame, which includes information indicative of no acknowledgement, to the transmitting entity, if one or more of the MPDUs are not received.

11. The method of claim 10, wherein the NACK frame includes a frame header having a frame control section and a frame body, and wherein the information is defined by a reserved field of the frame control section.

12. The method of claim 11, wherein the frame body includes a bitmap field indicative of which of the MPDUs have not been received.

13. A method of confirming the receipt of a transmitted data stream in a wireless local area network (WLAN), the method comprising:

sequentially transmitting a plurality of packets to a receiving entity, each packet being fragmented into a plurality of fragment packets, wherein the plurality of fragment packets form a sequence having a sequence number and each of the plurality of fragment packets has a fragment number, wherein the fragment numbers are sequentially numbered but the sequence number remains the same and wherein the plurality of fragment packets are transmitted without waiting for an acknowledgement, for each individual fragment packet, from the receiving entity;

receiving an acknowledgement frame from the receiving entity only after the last fragment is transmitted;

checking bitmap fields of a bitmap section of the acknowledgement frame, wherein each of the bitmap fields corresponds to each transmitted fragment packet and indicates whether the corresponding fragment packet has been correctly received or not by the receiving entity;

determining, based on the bitmap fields, whether there is a missing fragment packet, which has not been received by the receiving entity; and

retransmitting the missing fragment packet to the receiving entity.

14. The method of claim 13, wherein the method is performed in either an access point or a transmitting station.

15. A system for acknowledging the receipt of a transmitted data stream in a wireless local area network (WLAN), wherein the system is configured to i) receive a plurality of packets from a transmitting entity, each packet being fragmented into a plurality of fragment packets, wherein the plurality of fragment packets form a sequence having a sequence number and each of the plurality of fragment packets has a fragment number, wherein the fragment numbers are sequentially numbered but the sequence number remains the same and wherein the fragment packets are received in the order of the fragment numbers, ii) determine whether the last fragment packet of the sequence is received, and iii) send an acknowledgement packet to the transmitting entity only after it has been determined that the last fragment packet has been received, wherein each of the fragment packets includes a frame control section and a sequence control section, and wherein the system is further configured to check a more fragments field of the frame control section and check a fragment number field and a sequence number field of the sequence control section so as to determine whether the last fragment packet of the sequence has been received.

16. The system of claim 15, wherein the system comprises at least one of an access point and a receiving station.

17. The system of claim 16, wherein the receiving station comprises one of the following:

a personal computer (desktop, laptop, palmtop), a mobile phone, or other portable communication devices such as a hand-held PC, a wallet PC and a personal digital assistant (PDA).

18. A system for acknowledging the receipt of a transmitted data stream in a wireless local area network (WLAN), the system comprising:

means for reeeiving a plurality of packets from a transmitting entity, each packet being fragmented into a plurality or fragment packets, wherein the plurality of fragment packets form a sequence having a sequence number and each of the plurality of fragment packets has a fragment number, wherein the fragment numbers are sequentially numbered but the sequence number remains the same and wherein the fragment packets are received in the order of the fragment numbers;

means for determining whether the last fragment packet of the sequence is received; and

means for sending an acknowledgement packet to the transmitting entity only after it has been determined that the last fragment packet has been received,

wherein each of the fragment packets includes a frame control section and a sequence control section, and wherein the determining comprises checking a more fragments field of the frame control section and checking a fragment number field and a sequence number field of the sequence control section so as to determine whether the last fragment packet of the sequence has been received.