Method and apparatus for maximizing standby time in remote stations configured to receive broadcast databurst messages

• US 8,194,719 B2
• Filed: 04/09/2009
• Issued: 06/05/2012
• Est. Priority Date: 02/11/2000
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Sarkar, Sandip, Wang, Jun, Tiedemann, Edward G. Jr.
• Primary Examiner(s): Tse, Young T.
• Application Number:
  US12/420,900
• Publication Number:
  US 20090285267A1
• Time in Patent Office: 1,153 Days
• Field of Search: 375/140, 375/141, 375/146, 375/147, 375/260, 375/262, 375/265, 375/308, 375/329, 375/340, 375/341, 370/330, 370/335, 370/336, 370/337, 370/342, 370/344, 370/345, 370/347, 370/441, 370/442, 370/458, 340/3.21, 340/7.1, 340/7.2, 340/7.21, 340/7.28, 455/426.1, 455/450, 455/458
• US Class Current: 375/146
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 68/025 Indirect paging
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A wireless telecommunications system includes a base station, a plurality of remote stations, a first channel for general page messages containing paging information and broadcast databurst message references, and an auxiliary channel for broadcast databurst notification indicators for the purpose of increasing standby time in remote stations configured to receive broadcast databurst messages.

Claims

1. A method for receiving broadcast messages in a spread spectrum telecommunications system for maximizing standby time in remote stations configured to receive the broadcast messages, the method comprising:

associating broadcast message categories with bit indices of a broadcast indicator bit stream by hashing desirable said broadcast message categories via a pre-determined hashing function to determine said bit indices;

receiving one or more broadcast indicator bits of the broadcast indicator bit stream on a modified quick paging channel that includes a plurality of quick paging slots;

receiving one or more incoming page indicator bits on the modified quick paging channel;

comparing each of said one or more broadcast indicator bits and each of the one or more incoming page indicator bits to an on or off value; and

determining from said comparison whether to subsequently receive and decode an encoded bit stream that follows said broadcast indicator bit stream by a pre-determined time interval,

wherein said modified quick paging channel comprises a first section of N said broadcast indicator bits, a second section of (QPS-2N)/2 said incoming page indicator bits, and a third section of (QPS-2N)/2 said incoming page indicator bits, where QPS equals the total number of bits in one quick paging slot, wherein N is a predetermined value.

2. The method of claim 1 wherein said third section of said incoming page indicator bits comprises bit pairs with the second section of incoming page indicator bits.

3. The method of claim 1 wherein said first section of N said broadcast indicator bits comprises first and second sets of said broadcast indicator bits, with each set having N/2 said broadcast indicator bits.

4. The method of claim 1 wherein the first section of N said broadcast indicator bits includes two mutually redundant sets of the broadcast indicator bits.

5. The method of claim 1, wherein the step of receiving said one or more broadcast indicator bits on said modified quick paging channel comprises the step of demodulating a corresponding uncoded, on-off keying modulated direct sequence spread spectrum signal.

6. The method of claim 5 wherein said first section of N said broadcast indicator bits comprises first and second sets of said broadcast indicator bits, with each set having N/2 said broadcast indicator bits and wherein pairs of corresponding said broadcast indicator bits from said first and second sets are monitored together.

7. The method of claim 1, wherein the step of receiving said one or more broadcast indicator bits comprises the step of demodulating a corresponding signal on the modified quick paging channel.

8. The method of claim 7, wherein the step of receiving the one or more incoming page indicator bits comprises the step of demodulating a corresponding signal on said modified quick paging channel after demodulating said corresponding signal to said one or more broadcast indicator bits.

9. The method of claims 1 further comprising:

waking up on a periodic basis to receive said one or more broadcast indicator bits in the broadcast indicator bit stream located at said bit indices.

10. A method for transmitting broadcast messages in a spread spectrum telecommunications system for maximizing standby time in remote stations configured to receive the broadcast messages, the method comprising:

determining broadcast message categories to be transmitted in predetermined time slots;

providing the determined broadcast message categories to a pre-defined hashing function to generate a hashing function output corresponding to one or more broadcast indicator bits from a set of N broadcast indicator bits, wherein N is a pre-determined value;

generating an N-bit broadcast indicator bit stream based on the hashing function output, wherein the broadcast indicator bits in the broadcast indicator bit stream corresponding to the hashing function output are set to an on value and all other said broadcast indicator bits in the broadcast indicator bit stream are set to an off value;

transmitting the broadcast indicator bit stream; and

transmitting at a predetermined time slot subsequent to transmitting the broadcast indicator bit stream one or more general paging messages comprising one or more broadcast pointers corresponding to said broadcast message categories.

11. The method of claim 10 wherein system time is additionally used as an input to the pre-defined hashing function.

12. The method of claim 10 wherein the broadcast indicator bit stream is transmitted on an auxiliary channel as an uncoded, on-off keying (OOK) modulated direct sequence spread spectrum signal.

13. The method of claim 12 wherein the auxiliary channel and a quick paging channel are transmitted at the same time, with slots of the auxiliary channel substantially time-aligned with slots of the quick paging channel.

14. The method of claim 10 wherein said broadcast indicator bit stream is transmitted on a modified quick paging channel that includes a plurality of quick paging slots, and further comprising transmitting one or more incoming page indicator bits on the modified quick paging channel;

wherein said modified quick paging channel comprises a first section of N said broadcast indicator bits, a second section of (QPS-2N)/2 said incoming page indicator bits, and a third section of (QPS-2N)/2 said incoming page indicator bits, where QPS equals the total number of bits in one quick paging slot.

15. The method of claim 14 wherein said first section of N said broadcast indicator bits comprises first and second sets of said broadcast indicator bits, with each set having N/2 said broadcast indicator bits and wherein pairs of corresponding said broadcast indicator bits from said first and second sets are mutually redundant bits.

16. The method of claim 10, wherein said broadcast indicator bit stream is overlaid with one or more incoming page indicator bits on a modified quick paging channel.

17. An apparatus for receiving broadcast messages in a spread spectrum telecommunications system for maximizing standby time in remote stations configured to receive the broadcast messages, the apparatus comprising:

means for associating broadcast message categories with bit indices of a broadcast indicator bit stream by hashing desirable said broadcast message categories via a pre-determined hashing function to determine said bit indices, said hashing function having system time as an input;

means for receiving one or more broadcast indicator bits of the broadcast indicator bit stream on a modified quick paging channel;

means for receiving one or more incoming page indicator bits on said modified quick paging channel;

means for comparing each of said one or more broadcast indicator bits and each of said one or more incoming page indicator bits to an on or off value; and

means for determining from said comparison whether or not to subsequently receive and decode an encoded bit stream that follows said broadcast indicator bit stream by a pre-determined time interval.

18. The apparatus of claim 17 wherein the means for receiving said one or more broadcast indictor bits comprises means for demodulating a corresponding uncoded, on-off keying modulated direct sequence spread spectrum signal.

19. The apparatus of claim 17 wherein said one or more incoming page indicator bits are received after receiving said one or more broadcast indicator bits.

20. The apparatus of claim 19 wherein the means for receiving said one or more broadcast indicator bits comprises means for demodulating a corresponding signal on the modified quick paging channel.

21. The apparatus of claim 20 wherein said modified quick paging channel has a plurality of quick paging slots and comprises a first section of N said broadcast indicator bits, a second section of (QPS-2N)/2 said incoming page indicator bits, and a third section of (QPS-2N)/2 said incoming page indicator bits, where QPS equals the total number of bits in one quick paging slot.

22. The apparatus of claim 17 wherein said one or more broadcast indicator bits are overlaid with said one or more incoming page indicator bits on said modified quick paging channel.

23. Apparatus for transmitting broadcast messages in a spread spectrum telecommunications system for maximizing standby time in remote stations configured to receive the broadcast messages, the apparatus comprising:

means for determining broadcast message categories to be transmitted in predetermined time slots;

means for providing the determined broadcast message categories to a pre-defined hashing function to generate a hashing function output corresponding to one or more broadcast indicator bits from a set of N broadcast indicator bits, wherein N is a pre-determined value;

means for generating an N-bit broadcast indicator bit stream based on the hashing function output, wherein the broadcast indicator bits in the broadcast indicator bit stream corresponding to the hashing function output are set to an on value and all other said broadcast indicator bits in the broadcast indicator bit stream are set to an off value;

means for transmitting the broadcast indicator bit stream; and

means for transmitting at a predetermined time slot subsequent to transmitting the broadcast indicator bit stream one or more general paging messages comprising one or more broadcast pointers corresponding to said broadcast message categories.

24. The apparatus of claim 23 wherein system time is additionally used as an input to the pre-defined hashing function.

25. The apparatus of claim 23 wherein said means for transmitting the broadcast indicator bit stream transmits the broadcast indicator bit stream on an auxiliary channel as an uncoded, on-off keying (OOK) modulated direct sequence spread spectrum signal.

26. The apparatus of claim 25 wherein the auxiliary channel and a quick paging channel are transmitted at the same time, with slots of the auxiliary channel substantially time-aligned with slots of the quick paging channel.

27. The apparatus of claim 23 wherein said broadcast indicator bit stream is transmitted on a modified quick paging channel that includes a plurality of quick paging slots, and further comprising means for transmitting one or more incoming page indicator bits on the modified quick paging channel;

wherein said modified quick paging channel comprises a first section of N said broadcast indicator bits, a second section of (QPS-2N)/2 said incoming page indicator bits, and a third section of (QPS-2N)/2 said incoming page indicator bits, where QPS equals the total number of bits in one quick paging slot.

28. The apparatus of claim 27 wherein said first section of N said broadcast indicator bits comprises first and second sets of said broadcast indicator bits, with each set having N/2 said broadcast indicator bits and wherein pairs of corresponding said broadcast indicator bits from said first and second sets are mutually redundant bits.

29. The apparatus of claim 23 wherein said broadcast indicator bit stream is overlaid with one or more incoming page indicator bits on a modified quick paging channel.