Method for acknowledging messages in a communication system

• US 6,898,414 B2
• Filed: 10/28/2002
• Issued: 05/24/2005
• Est. Priority Date: 10/28/2002
• Status: Expired due to Fees

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Ekl, Randy L., Rotstein, Ron
• Primary Examiner(s): Corsaro, Nick
• Assistant Examiner(s): TRINH, TAN H
• Application Number:
  US10/281,596
• Publication Number:
  US 20040082294A1
• Time in Patent Office: 939 Days
• Field of Search: 455/3.05, 455/12.1, 455/13.1, 455/427, 455/453, 455/426, 455/560, 455/18, 455/434, 455/515, 370/321, 370/347, 370/329
• US Class Current: 455/3.05
• CPC Class Codes: H04L 1/0066 Parallel concatenated codes
• CPC Class Codes: H04L 1/1816 with retransmission of the same, encoded, message
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 67/04 specially adapted for terminals or networks with limited capabilities; specially adapted for terminal portability
• CPC Class Codes: H04L 69/28 Timers or timing mechanisms used in protocols
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

At a first device (102 or 104), a message is received and processed. If the message is processed during a first time period, the first device transmits an acknowledgement message during a second time period; otherwise the first device transmits the acknowledgment message during a third time period. The second time period and the third time period are exclusive of each other.

Claims

1. A method comprising the steps of:

at a first device in a wireless system whereby the wireless system has a protocol comprising at least one superframe, wherein the at least one superframe is an interval of time between consecutive beacon messages;

receiving a message in a first superframe;

processing the message; and

if the message is processed during a first time period, transmitting an acknowledgement message during a second time period, otherwise transmitting the acknowledgment message during a third time period,

wherein the second time period and the third time period are exclusive of each other, and

wherein the first time period, the second time period, and the third time period are in the first superframe.

2. The method of claim 1 wherein only the acknowledgement message is allowed to be transmitted during the second time period.

3. The method of claim 1 wherein the message is selected from a group consisting of:

a turbocoded message, an encrypted message, and a forward error corrected message.

4. The method of claim 1 wherein the message was transmitted by a first device, and further comprising the step of adding an address of the first device to a list if the message is not processed during the first time period.

5. The method of claim 4 further comprising the step of deleting the address of the first device from the list after transmitting the acknowledgement message for the message.

6. The method of claim 4 further comprising the step of removing the address of the first device from the list after the acknowledgement message is transmitted during the third time period.

7. The method of claim 1 further comprising the step of transmitting at least a second message to at least a second device during the third time period.

8. The method of claim 1 wherein the message is received during a superframe, and wherein the third time period begins at the end of the second time period and ends at the end of the superframe.

9. The method of claim 1 further comprising the step of receiving a second message, and wherein the third time period begins upon receipt of the second message.

10. The method of claim 9 wherein the second message is a start of delayed acknowledgement message.

11. A method comprising the steps of:

receiving a message in a first superframe, wherein the at least one superframe is an interval of time between consecutive beacon messages;

determining whether the message can be processed during a first time period;

if the message can be processed during the first time period, processing the message and transmitting an acknowledgement message during a second time period, wherein only the acknowledgement message is allowed to be transmitted during the second time period; and

if the message cannot be processed during the first time period, setting a flag to transmit the acknowledgement during a third time period after the message has been processed,

wherein the second time period and the third time period are exclusive of each other, and

wherein the first time period, the second time period, and the third time period are in the first superframe.

12. A method comprising the steps of:

at a first device in a wireless system whereby the wireless system has a protocol comprising at least one superframe, wherein the at least one superframe is an interval of time between consecutive beacon messages;

receiving a message;

determining whether the message is of a first type or a second type;

if the message is of the first type, setting a flag when the message is addressed to the first device otherwise, incrementing a counter value, wherein the counter value is associated with a period of time;

if the message is of the second type, transmitting an acknowledgement message for the message for which the flag was set after waiting the period of time associated with the counter value at the time the flag was sets,

wherein the message and the acknowledgement message are in one superframe.

13. The method of claim 12 wherein the message is of a first type if the message cannot be processed by the first device within a first time period.

14. The method of claim 12 wherein the message is of the first type if the message is one of:

a turbocoded message, an encrypted message, and a forward error corrected message.

15. The method of claim 12 wherein the message is of the second type if the message is a start of delayed acknowledgement message.

16. The method of claim 12 further comprising the steps of:

determining that the message is of a third type;

clearing the flag that was set; and

re-setting the counter value to a default value.

17. The method of claim 16 wherein the message is of the third type if the message is one of a beacon message and a contention free end message.

18. A method comprising the steps of:

at a first device in a wireless system whereby the wireless system has a protocol comprising at least one superframe, wherein the at least one superframe is an interval of time between consecutive beacon messages;

receiving at least one type-one message;

incrementing a counter value each time a type-one message is received that is addressed to another device, wherein the counter value is associated with a period of time;

setting a flag each time a type-one message is received that is addressed to the first device;

receiving a type-two message;

transmitting an acknowledgement message for each message in which a flag was set after waiting the period of time associated with the counter value at the time each flag was set,

wherein the at least one type-one message, the type-two message, and the acknowledgement message are in one superframe.