Methods and systems for data communication over wireless communication channels

• US 8,351,434 B1
• Filed: 02/05/2010
• Issued: 01/08/2013
• Est. Priority Date: 02/06/2009
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Olympus Corporation
• Inventors: Buyanin, Michael, Muqattash, Alaa, Fukuda, Takayasu
• Primary Examiner(s): Wong, Warner
• Application Number:
  US12/701,377
• Time in Patent Office: 1,068 Days
• Field of Search: 370276-278, 370310-350, 370/394, 370428-429
• US Class Current: 370/394
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/188 Time-out mechanisms
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• 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 28/26 Resource reservation
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling

Abstract

Systems and methods for improving network performance. A method of transmitting packet data across a network includes a transmitting network device establishing a reservation to transmit traffic to a plurality of wireless receiving network devices across a network; the transmitting network device transmitting a sequence of packets across the network, wherein a packet of the sequence of packets includes data requesting the receivers acknowledge receipt of the packet; the transmitting network device waiting for a predetermined time to receive acknowledgement of receipt of the packet from the wireless receiving network devices; the transmitting network device retransmitting a packet across the network only if it does not receive an acknowledgement for that packet from any of the wireless receiving network devices within the predetermined time.

Claims

1. A method of transmitting packet data across a network comprising:

a transmitting network device establishing a reservation to transmit traffic to a plurality of wireless receiving network devices across a network;

the transmitting network device transmitting a sequence of packets across the network, wherein a packet of the sequence of packets includes data requesting the plurality of wireless receiving network devices acknowledge receipt of the packet;

the transmitting network device waiting for a predetermined time to receive acknowledgement of receipt of the packet from the plurality of wireless receiving network devices, wherein the transmitting network device transmits information identifying the plurality of wireless receiving network devices and specifying an order in which the plurality of wireless receiving network devices are to transmit their respective acknowledgements;

the transmitting network device retransmitting a packet across the network only if it does not receive an acknowledgement for that packet from any of the plurality of wireless receiving network devices within the predetermined time; and

a wireless receiving network device calculating a time to send its acknowledgements based on its position in the order in which the plurality of wireless receiving network devices are to transmit their respective acknowledgements.

2. The method of claim 1, wherein, the wireless receiving network device calculating a time to send its acknowledgements comprises:

the wireless receiving network device determining its place in the order;

the access controller calculating an amount of time required for any wireless receiving network devices that are earlier in the order to transmit their respective acknowledgements; and

the wireless receiving network device determining the timeslot as a timeslot occurring a predetermined time after the amount of time calculated.

3. The method of claim 1, further comprising the transmitting network device determining a quantity of wireless receiving network devices to receive its traffic during the established reservation.

4. The method of claim 3, wherein the predetermined time is calculated based on the quantity of wireless receiving network devices to receive the traffic.

5. The method of claim 3, further comprising the wireless transmitting device transmitting an identification of wireless receiving network devices that are to receive and acknowledge the traffic.

6. The method of claim 1, wherein the order in which the plurality of wireless receiving network devices are to transmit their respective acknowledgements is configured in advance of transmitting the traffic.

7. The method of claim 1, further comprising further wireless receiving network device of the plurality of wireless receiving network devices forwarding the packet to a packet aggregator ver a wired backbone network.

8. The method of claim 7, further comprising the packet aggregator checking for duplicate packets and removing duplicate packets from packets received from the plurality of wireless receiving network devices to recreate the original sequence of packets.

9. The method of claim 8, further comprising the packet aggregator forwarding the recreated original sequence of packets to a destination device.

10. The method of claim 8, further comprising the packet aggregator reordering received packets to maintain a second order of packets transmitted by the transmitting network device.

11. The method of claim 7, further comprising the further wireless receiving network device of the plurality of wireless receiving network devices determining whether another of the plurality of wireless receiving network devices has forwarded the packet to the packet aggregator over the wired backbone.

12. The method of claim 7, wherein the further wireless receiving network device forwards the packet to the packet aggregator only if the packet has not been forwarded to the aggregator by another of the plurality of wireless receiving network devices.

13. The method of claim 7, wherein the order in which wireless receiving network devices transmit their respective acknowledgements is dynamically controlled by the packet aggregator.

14. The method of claim 1, further comprising a further wireless receiving network device of the plurality of wireless receiving network devices checking for an acknowledge signal from another wireless receiving network device acknowledging the packet and transmitting its acknowledgement only if it has not received an acknowledgement signal from another wireless receiving network device of the plurality of wireless receiving network devices.

15. The method of claim 14, further comprising the plurality of wireless receiving network devices transmitting their respective acknowledgement signals to the other of the plurality of wireless receiving network devices via a wired or wireless interface or bus.

16. The method of claim 1, wherein the packet retransmitted comprises a single packet or a group of packets covered by the data requesting acknowledgement.

17. The method of claim 1, wherein the transmitting network device is a transmitter at an endoscope that wirelessly transmits streaming packet video data to the plurality of wireless receiving network devices disposed at different locations in an operating theater, and wherein the destination device is a video display monitor.

18. The method of claim 17, wherein the plurality of wireless receiving network devices further comprise directional antennas with their respective radiation patterns directed toward a predetermined location in the operating theater.

19. A system for data communications from a transmitting network device to a receiving network device, the system comprising:

a plurality of wireless receiving network devices each comprising a receiver, a first processor coupled to the receiver and configured to execute instructions, and a first memory communicatively coupled to the processor and configured to store first program instructions, which when executed by the processor cause the plurality of wireless receiving network devices to perform the operation of receiving a packet transmitted from the transmitting network device and cause a wireless receiving network device of the plurality of wireless receiving network devices to calculate a time to send its acknowledgements based on its position in an order in which the plurality of wireless receiving network devices are to transmit their respective acknowledgements;

the transmitting network device comprising a second processor coupled to the transmitter and configured to execute instructions, and a second memory communicatively coupled to the processor and configured to store second program instructions, which, when executed by the processor cause the transmitting network device to perform the operations comprising;

establishing a reservation to transmit traffic to the plurality of wireless receiving network devices across a network;

transmitting a sequence of packets across the network, wherein a packet of the sequence of packets includes data requesting the receivers of the plurality of wireless receiving network devices acknowledge receipt of the packet;

waiting for a predetermined time to receive acknowledgement of receipt of the packet from the plurality of wireless receiving network devices;

retransmitting a packet across the network only if it does not receive an acknowledgement for that packet from any of the plurality of wireless receiving network devices within the predetermined time; and

transmitting information identifying the plurality of wireless receiving network devices and specifying the order in which the plurality of wireless receiving network devices are to transmit their respective acknowledgements.

20. The system of claim 19, wherein, a further wireless receiving network device calculating a time to send its acknowledgements comprises:

the wireless receiving network device determining its place in the order;

the access controller calculating an amount of time required for any wireless receiving network devices that are earlier in the order to transmit their respective acknowledgements; and

the wireless receiving network device determining the timeslot as a timeslot occurring a predetermined time after the amount of time calculated.

21. The system of claim 19, wherein the program instructions are further configured to cause the transmitting network device to determine a quantity of wireless receiving network devices to receive its traffic during the established reservation.

22. The system of claim 21, wherein the predetermined time is calculated based on the quantity of wireless receiving network devices to receive the traffic.

23. The system of claim 21, wherein the program instructions are further configured to cause the transmitting network device to transmit an identification of wireless receiving network devices that are to receive and acknowledge the traffic.

24. The system of claim 19, wherein the order in which wireless receiving network devices are to transmit their respective acknowledgements is configured in advance of transmitting the traffic.

25. The system of claim 19, further comprising an aggregator having a processor coupled to a receiver and configured to execute instructions, and a memory communicatively coupled to the processor and configured to store third program instructions, which when executed by the processor cause the aggregator to perform the operation of receiving packets from the plurality of wireless network receiving devices and wherein the program instructions are further configured to cause a further wireless receiving network device of the plurality of wireless receiving network devices to forward the packet to a packet aggregator over a wired backbone network.

26. The system of claim 25, wherein the third program instructions are further configured to cause the packet aggregator to check for duplicate packets and remove duplicate packets from packets received from the plurality of wireless receiving network devices to recreate the original sequence of packets.

27. The system of claim 26, wherein the third program instructions are further configured to cause the packet aggregator to forward the recreated original sequence of packets to a destination device.

28. The system of claim 26, wherein the third program instructions are further configured to cause the packet aggregator to reorder received packets to maintain a second order of packets transmitted by the transmitting network device.

29. The system of claim 25, wherein the first program instructions are further configured to cause the further wireless receiving network devices to determine whether another of the plurality of wireless receiving network devices has forwarded the packet to the packet aggregator over the wired backbone.

30. The system of claim 25, wherein the first program instructions are further configured to cause the plurality of wireless receiving network devices to forward the packet to the packet aggregator only if the packet has not been forwarded to the aggregator by another of the plurality of wireless receiving network devices.

31. The system of claim 25, wherein the order in which wireless receiving network devices transmit their respective acknowledgements is dynamically controlled by the packet aggregator.

32. The system of claim 19, wherein the first program instructions are further configured to cause a further wireless receiving network device to perform the operation of checking for an acknowledge signal from another receiver of another wireless receiving network device acknowledging the packet and transmitting its acknowledgement only if it has not received an acknowledgement signal from the other wireless receiving network device of the plurality of wireless receiving network devices.

33. The system of claim 32, wherein the plurality of wireless receiving network devices further comprise a bus interface and wherein the first program instructions are further configured to cause the plurality of wireless receiving network devices to transmit their respective acknowledgement signals to the other of the plurality of wireless receiving network devices via a wired or wireless interface or bus.

34. The system of claim 19, wherein the packet retransmitted comprises a single packet or a group of packets covered by the data requesting acknowledgement.

35. The system of claim 19, wherein the transmitting network device is a transmitter at an endoscope that wirelessly transmits streaming packet video data to the plurality of wireless receiving network devices disposed at different locations in an operating theater, and wherein the destination device is a video display monitor.

36. The system of claim 35, wherein the plurality of wireless receiving network devices further comprise directional antennas with their respective radiation patterns directed toward a predetermined location in the operating theater.

37. A method of transmitting packet data across a network comprising:

a transmitting network device establishing a reservation to transmit traffic to a plurality of wireless receiving network devices across a network;

the transmitting network device transmitting a sequence of packets across the network, wherein a packet of the sequence of packets includes data requesting the plurality of wireless receiving network devices acknowledge receipt of the packet;

the transmitting network device waiting for a predetermined time to receive acknowledgement of receipt of the packet from the plurality of wireless receiving network devices;

the transmitting network device retransmitting a packet across the network only if it does not receive an acknowledgement for that packet from any of the plurality of wireless receiving network devices within the predetermined time;

a wireless receiving network device of the plurality of wireless receiving network devices forwarding the packet to a packet aggregator over a wired backbone network; and

one of the plurality of wireless receiving network devices determining whether another of the plurality of wireless receiving network devices has forwarded the packet to the packet aggregator over the wired backbone.

38. The method of claim 37, further comprising the packet aggregator checking for duplicate packets and removing duplicate packets from packets received from the plurality of wireless receiving network devices to recreate the original sequence of packets.

39. The method of claim 38, further comprising the packet aggregator forwarding the recreated original sequence of packets to a destination device.

40. The method of claim 38, further comprising the packet aggregator reordering received packets to maintain an order of packets transmitted by the transmitting network device.

41. The method of claim 37, wherein the one of the plurality of wireless receiving network devices forwards the packet to the packet aggregator only if the packet has not been forwarded to the aggregator by another of the plurality of wireless receiving network devices.

42. The method of claim 37, wherein an order in which wireless receiving network devices transmit their respective acknowledgements is dynamically controlled by the packet aggregator.

43. A method of transmitting packet data across a network comprising:

a transmitting network device establishing a reservation to transmit traffic to a plurality of wireless receiving network devices across a network;

the transmitting network device transmitting a sequence of packets across the network, wherein a packet of the sequence of packets includes data requesting the plurality of wireless receiving network devices acknowledge receipt of the packet;

the transmitting network device waiting for a predetermined time to receive acknowledgement of receipt of the packet from the plurality of wireless receiving network devices;

the transmitting network device retransmitting a packet across the network only if it does not receive an acknowledgement for that packet from any of the wireless receiving network devices within the predetermined time;

a wireless receiving network device of the plurality of wireless receiving network devices forwarding the packet to a packet aggregator over a wired backbone network, wherein the wireless receiving network device of the plurality of wireless receiving network devices forwards the packet to the packet aggregator only if the packet has not been forwarded to the aggregator by another of the plurality of wireless receiving network devices.

44. The method of claim 43, further comprising the packet aggregator checking for duplicate packets and removing duplicate packets from packets received from the plurality of wireless receiving network devices to recreate the original sequence of packets.

45. The method of claim 44, further comprising the packet aggregator forwarding the recreated original sequence of packets to a destination device.

46. The method of claim 44, further comprising the packet aggregator reordering received packets to maintain an order of packets transmitted by the transmitting network device.

47. The method of claim 43, wherein an order in which wireless receiving network devices transmit their respective acknowledgements is dynamically controlled by the packet aggregator.

48. A method of transmitting packet data across a network comprising:

a transmitting network device establishing a reservation to transmit traffic to a plurality of wireless receiving network devices across a network;

the transmitting network device transmitting a sequence of packets across the network, wherein a packet of the sequence of packets includes data requesting the plurality of wireless receiving network devices acknowledge receipt of the packet;

the transmitting network device waiting for a predetermined time to receive acknowledgement of receipt of the packet from the plurality of wireless receiving network devices;

the transmitting network device retransmitting a packet across the network only if it does not receive an acknowledgement for that packet from any of the wireless receiving network devices within the predetermined time;

a wireless receiving network device of the plurality of wireless receiving network devices forwarding the packet to a packet aggregator over a wired backbone network, wherein an order in which the plurality of wireless receiving network devices transmit their respective acknowledgements is dynamically controlled by the packet aggregator.

49. The method of claim 48, further comprising the packet aggregator checking for duplicate packets and removing duplicate packets from packets received from the plurality of wireless receiving network devices to recreate the original sequence of packets.

50. The method of claim 49, further comprising the packet aggregator forwarding the recreated original sequence of packets to a destination device.

51. The method of claim 49, further comprising the packet aggregator reordering received packets to maintain an order of packets transmitted by the transmitting network device.

52. A method of transmitting packet data across a network comprising:

a transmitting network device establishing a reservation to transmit traffic to a plurality of wireless receiving network devices across a network;

the transmitting network device transmitting a sequence of packets across the network, wherein a packet of the sequence of packets includes data requesting the plurality of wireless receiving network devices acknowledge receipt of the packet;

the transmitting network device waiting for a predetermined time to receive acknowledgement of receipt of the packet from the plurality of wireless receiving network devices;

the transmitting network device retransmitting a packet across the network only if it does not receive an acknowledgement for that packet from any of the wireless receiving network devices within the predetermined time;

a wireless receiving network device of the plurality of wireless receiving network devices checking for an acknowledge signal from another wireless receiving network device of the plurality of wireless receiving network devices acknowledging the packet and transmitting its acknowledgement only if it has not received an acknowledgement signal from the another wireless receiving network device of the plurality of wireless receiving network devices.

53. The method of claim 52, further comprising the plurality of wireless receiving network devices transmitting their respective acknowledgement signals to the other of the plurality of wireless receiving network devices via a wired or wireless interface or bus.