Signaling reliability in using high-speed shared packet data channel

• US 7,474,642 B1
• Filed: 09/15/2004
• Issued: 01/06/2009
• Est. Priority Date: 09/15/2004
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Chheda, Ashvin H.
• Primary Examiner(s): Pham, Chi H
• Assistant Examiner(s): Elallam, Ahmed
• Application Number:
  US10/941,468
• Time in Patent Office: 1,574 Days
• Field of Search: 370/320, 370/335, 370/342, 370/441, 370/278, 370/235, 370/329, 370/418, 370/429, 455/512
• US Class Current: 370/329
• CPC Class Codes: H04B 7/264 for data rate control

Abstract

The present invention provides a priority scheme and a data rate reduction method to increase the reliability of the signaling messages on a shared packet data channel. Signaling messages and packet data received for transmission are stored in a packet data buffer and at least one signaling buffer, respectively. Packet data or signaling messages are transmitted based on the scheduling algorithm assigned priority. The signaling message priorities are adjusted by a weighting factor assigned to the signaling buffer. The signaling message priority may be adjusted by a Quality of Service level. The transmission data rate is adjusted by an offset factor from the highest possible data rate that can be supported to a lower rate to improve reliability. To increase the effective data rate, the signaling message may be concatenated with another signaling message in order to completely fill the signaling message frame.

Claims

1. A method for controlling transmission of packet data and signaling messages on a shared high-speed packet data channel to improve reliability of the signaling messages, the method comprising:

receiving a packet data for transmission on the shared high-speed packet data channel and storing the packet data in a packet data buffer;

receiving a signaling message for transmission on the shared high-speed packet data channel and storing the signaling message in a signaling buffer;

assigning a data priority to each packet data in the packet data buffer based on a scheduling algorithm;

assigning a signaling message priority to each signaling message in the signaling buffer based on a scheduling algorithm;

selecting one of the packet data or the signaling message as a next transmitted packet based on the assigned data or signal priority, respectively;

receiving a channel condition signal from a mobile terminal;

mapping the received channel condition signal to a highest possible data rate for the received channel condition signal to determine a message data rate;

for a signaling message that is selected as the next transmitted packet, adjusting the message data rate by an offset factor to determine an adjusted data rate wherein the adjusted data rate is lower than the message data rate for the received channel condition signal; and

transmitting the selected next transmitted packet at one of the message data rate or the adjusted data rate.

2. The method of claim 1 wherein the transmitting the signaling message further comprises concatenating at least two signaling messages within a signaling message frame to increase an effective signaling message transmission rate from the adjusted data rate for a specified group of signaling messages wherein the specified group of signaling messages comprises non-critical signaling messages.

3. The method of claim 1 wherein the assigning the signaling message priority further comprises adjusting the signaling message priority based on a subscriber Quality of Service (QoS) level assigned to each signaling message.

4. The method of claim 1 wherein the assigning the data priority and the signaling message priority comprises scaling the signaling messages by a weighting factor to increase the signaling message priority relative to the data priority.

5. A method for controlling transmission of packet data and signaling messages on a shared high-speed packet data channel to improve reliability of the signaling messages, the method comprising:

receiving a packet data for transmission on the shared high-speed packet data channel and storing the packet data in a packet data buffer;

assigning a packet data priority to each packet data in the packet data buffer;

receiving a signaling message for transmission on the shared high-speed packet data channel;

storing the received signaling message into one of a first signaling buffer or a second signaling buffer based on a delay sensitivity of the signaling message;

assigning a signaling message priority to each signaling message in the first and second signaling buffers;

transmitting each of the signaling messages from the first signaling buffer based on the assigned signaling message priority;

subsequently transmitting each of the signaling messages from the second signaling buffer based on the assigned signaling message priority; and

subsequently transmitting packet data from the packet data buffer until the reception of one of a critical or non-critical signaling message having an assigned priority that is the same as or higher than the packet data.

6. The method of claim 5 wherein the assigning the packet data priority and signaling message priority comprises assigning the priorities based on a scheduling algorithm.

7. The method of claim 6 wherein the scheduling algorithm comprises one of proportional-fair, round robin, and first-in-first-out.

8. The method of claim 7 wherein the assigning the signaling message priority further comprises adjusting the signaling message priority in the first signaling buffer by a first weighting factor and adjusting the signaling message priority in the second signaling buffer by a second weighting factor.

9. The method of claim 8 wherein the adjusting the signaling message priority further comprises adjusting the signaling message priority based on a subscriber Quality of Service (QoS) level assigned to each signaling message.

10. The method of claim 5 wherein the transmitting the signaling message further comprises concatenating at least two non-critical signaling messages in a signaling message frame.

11. The method of claim 10 wherein the at least two signaling messages are non-critical signaling messages.

12. The method of claim 5 wherein transmitting signaling messages from one of the first and second signaling buffers comprises:

receiving a channel condition signal from a mobile terminal;

mapping the received channel condition signal to a highest possible data rate for the received channel condition signal to determine a message data rate; and

adjusting the message data rate by an offset factor to determine an adjusted data rate wherein the adjusted data rate is lower than the message data rate for the received channel condition signal.

13. The method of claim 12 wherein the adjusting the message data rate further comprises adjusting the message data rate by a first amount for a first group of signaling messages and by a second amount for a second group of signaling messages.

14. A method for controlling transmission of packet data and signaling messages on a shared high-speed packet data channel to improve reliability of the signaling messages, the method comprising:

receiving at least one packet data for transmission on the shared high-speed packet data channel and storing the packet data in a packet data buffer;

receiving at least one signaling message for transmission on the shared high-speed packet data channel and storing the at least one signaling message in a signaling buffer;

assigning a data priority to each packet data and assigning a signaling message priority to each signaling message based on a scheduling algorithm;

adjusting the signaling message priority based on a weighting factor assigned to the signaling buffer;

transmitting one of a packet data and signaling message with the highest priority.

15. The method of claim 14 wherein the assigning the data priority further comprises adjusting the data priority based on one of a weighting factor assigned to the packet data buffer and a subscriber Quality of Service (QoS) weighting factor assigned to each data packet.

16. The method of claim 14 wherein the adjusting the signaling message priority further comprises adjusting the data priority based on a subscriber Quality of Service (QoS) weighting factor assigned to each signaling message.

17. The method of claim 14 wherein the transmitting the signaling message further comprises concatenating at least two signaling messages within a signaling message frame to increase an effective signaling message transmission rate from the adjusted data rate for a specified group of signaling messages wherein the specified group of signaling messages comprises non-critical signaling messages.

18. The method of claim 17 wherein the specified group of signaling messages comprises non-critical signaling messages.

19. The method of claim 14 wherein transmitting the signaling messages comprises:

receiving a channel condition signal from a mobile terminal;

mapping the received channel condition signal to a highest possible data rate for the received channel condition signal to determine a message data rate; and

adjusting the message data rate by an offset factor to determine an adjusted data rate wherein the adjusted data rate is lower than the message data rate for the received channel condition signal.

20. The method of claim 19 wherein the adjusting the message data rate further comprises adjusting the message data rate by a first amount for a first group of signaling messages and by a second amount for a second group of signaling messages.