Method and apparatus for maximizing the data transmission in a wireless data communication network

• US 5,555,241 A
• Filed: 06/02/1995
• Issued: 09/10/1996
• Est. Priority Date: 03/18/1994
• Status: Expired due to Term

• Current Assignee: Blackberry Limited
• Original Assignee: Blackberry Limited
• Inventors: Mousseau, Gary P., Lazaridis, Mihal, Little, Herb A., Sinha, Anand
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): VU, HUY DUY
• Application Number:
  US08/458,556
• Time in Patent Office: 466 Days
• Field of Search: 370/77, 370/99, 370/94.1, 370/94.2, 370/91, 370/92, 370/93, 370/119, 370/61, 370/32, 370/118, 370/79, 370/82, 370/83, 370/13, 370/17, 370/43, 375/222, 375/223, 375/219
• US Class Current: 370/389
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

The present invention provides a method for padding to maximize the number of characters transmitted by data communication equipment (DCE), such as a modem, to data terminal equipment (DTE). By employing the disclosed padding method the data throughput will be maximized and costs will be reduced by transmitting packets with a greater amount of characters. The present invention further provides a method for providing access to a control channel to invoke gateway functions to send qualified information from a DTE user to a remote system. Also a method to provide security by allowing private strings and passwords saved in a modem'"'"'s stored dial strings. Additionally, a method for scrolling the DTE'"'"'s screen to enhance readabilty and to provide compatability with standard terminal packages available on the market. Related apparatus is also revealed.

Claims

1. A method of packetizing data received from a data source, the method comprising the steps of:

accumulating data from the data source into a packet;

processing the data to determine whether one or more forwarding conditions has occurred, and if so storing said forwarding conditions in a memory;

detecting whether said one or more forwarding conditions are stored in said memory;

setting a timer to a first predetermined time period to indicate that at least one of the one or more forwarding conditions has been detected; and

if upon the first predetermined time period expiring, no additional data had been received during the first predetermined time period, transmitting the packet.

2. The method of claim 1, including the following steps:

if during the first predetermined time period before the timer expires at least one bit of additional data is received, resetting the timer to a second predetermined time period;

checking whether during the second predetermined time period at least one bit of data is received; and

if no data are received during the second predetermined time period, transmitting the packet.

3. The method of claim 2, wherein the first predetermined time period and the second predetermined time period are equal in duration.

4. The method of claim 2, wherein the resetting and checking steps are repeated for one or more subsequent time periods until during one of the one or more subsequent time periods, no data are received.

5. The method of claim 4, wherein at least two of the first predetermined time period, the second predetermined time period and the one or more subsequent time periods are equal in duration.

6. The method of claim 1, wherein presence of a forwarding character is one of the one or more forwarding conditions.

7. The method of claim 1, wherein expiration of an idle timer is one of the one or more forwarding conditions.

8. The method of claim 6, wherein the forwarding character is used only for indicating one of the one or more forwarding conditions and is then discarded.

9. The method of claim 6, wherein the forwarding character is first used to indicate one of the one or more forwarding conditions and then is appended to the packet.

10. The method of claim 1, wherein the data source is a serial data source.

21. The method of claim 1, wherein the processing step further includes comparing the accumulated data to a predetermined set of forwarding characters, and if the comparison step yields a match, storing a forwarding condition in the memory.

22. The method of claim 1, wherein the processing step further includes:

setting an idle-line timer to a predetermined idle time period upon the receipt of data from the data source;

generating and storing a forwarding condition if the idle-line timer expires before additional data is accumulated from the data source; and

resetting the idle-line timer if additional data is accumulated prior to the expiration of the timer.

11. An apparatus for packetizing data received from a data source comprising:

a buffer for accumulating data from the data source into a packet;

a processor for determining whether one or more forwarding conditions has occurred, and if so for directing said forwarding conditions to a memory;

means for detecting whether one or more forwarding conditions is stored in said memory;

a timer set to a first predetermined time period if at least one of the one or more forwarding conditions has been detected; and

a transmitter for transmitting the packet if during the first predetermined time period before the timer expires, no additional data are received.

12. The apparatus of claim 11, such apparatus further comprising means for resetting the timer to a second predetermined time period if during the first predetermined time period before the timer expires at least one bit of additional data is received;

checking means for determining whether during the second predetermined time period at least one bit of data has been received; and

transmitting means for transmitting the packet if no data are received during the second predetermined time period.

17. The apparatus of claim 11, wherein one of the one or more forwarding conditions is a predetermined forwarding character.

18. The apparatus of claim 17, wherein the forwarding character is only used to indicate that a packet of data is to be transmitted, and is then discarded.

19. The apparatus of claim 17, wherein the forwarding character is first used to indicate that a packet of data is to be transmitted, and is then appended to the packet.

20. The apparatus of claim 11, wherein one of the one or more forwarding conditions is the expiration of an idle-line timer.

13. A method of packetizing data received from a serial data source, the method comprising the steps of:

accumulating data from the serial data source into a packet;

processing the data to determine whether a first set of one or more forwarding conditions has occurred, and if so setting a first forwarding flag stored in a memory on to indicate that the first set has occurred;

detecting whether said first forwarding flag stored in the memory has been set on, and if so setting a timer to a first predetermined time period; and

detecting whether any additional data were received during the first predetermined time period, and if no additional data were received and the first forwarding flag had been set on, transmitting the packet.

14. The method of claim 13, including the following steps:

if during the first predetermined time period at least one bit of additional data is received, resetting the timer to a second predetermined time period;

checking whether during the second predetermined time period at least one bit of data is received;

detecting whether during the second predetermined period a second set of forwarding conditions has occurred and if the second set has occurred setting a second forwarding flag on to indicate that the second set has occurred; and

if no data are received during the second predetermined time period and if at least one of the first forwarding flag and the second forwarding flag has been set on, transmitting the packet.

15. The method of claim 14, wherein a single flag comprises the first forwarding flag and the second forwarding flag.

16. The method of claim 14, wherein the first set of forwarding conditions and the second set of forwarding conditions are identical.