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

• US 6,728,300 B1
• Filed: 02/11/2000
• Issued: 04/27/2004
• Est. Priority Date: 02/11/2000
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tiedemann, Edward G. Jr., Wang, Jun, Sarkar, Sandip
• Primary Examiner(s): TSE, YOUNG TOI
• Application Number:
  US09/503,031
• Time in Patent Office: 1,537 Days
• Field of Search: 375/130, 375/146, 375/147, 370/208, 370/209, 370/312, 370/313, 370/314, 370/336, 370/337, 370/345, 370/347, 455/426, 455/450, 455/458, 455/515, 340/7.1, 340/7.2, 340/7.28
• US Class Current: 375/147
• 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 comprising:

associating categories with bit indices of a broadcast indicator bit stream;

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

receiving said one or more bits;

comparing each of said one or more bits to an on or off value; and

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.

2. The method of claim 1, wherein the step of associating categories further comprising the step of hashing desirable categories of broadcast messages via a pre-determined hashing function to determine said bit indices.

3. The method of claim 1, wherein the step of receiving said one or more bits further comprises the step of demodulating an uncoded, on-off keying modulated direct sequence spread spectrum signal.

4. The method of claim 1, further comprising the step of receiving one or more incoming page indicator bits on a same channel as said one or more bits after receiving said one or more bits.

5. The method of claim 4, wherein the step of receiving said one or more bits further comprises the step of demodulating a first signal on a modified quick paging channel.

6. The method of claim 5, wherein the step of receiving one or more incoming page indicator bits further comprises the step of demodulating a second signal on said modified quick paging channel after demodulating said first signal.

7. The method of claim 4, wherein the step of receiving said one or more bits further comprises the step of receiving said one or more bits and said one or more incoming page indicator bits in an overlaid fashion on a modified quick paging channel.

8. The method of claim 1, wherein the step of receiving said one or more bits further comprises the step of demodulating a first signal on an auxiliary channel that is orthogonal to a quick paging channel.

9. The method of claim 8, further comprising:

receiving one or more incoming page indicator bits on the quick paging channel, wherein the step of receiving one or more incoming page indicator bits comprises the sub-step of demodulating a second signal on said quick paging channel.

10. A method for receiving broadcast messages in a spread spectrum telecommunications system comprising:

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

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

receiving said one or more bits on a modified quick paging channel;

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

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

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

11. The method of claim 10, wherein the step of receiving said one or more bits on said modified quick paging channel comprises the step of demodulating an uncoded, on-off keying modulated direct sequence spread spectrum signal.

12. A method for transmitting broadcast messages in a spread spectrum telecommunications system comprising:

a) determining prior to the beginning of a first time slot the categories of the broadcast messages that will be transmitted during said first time slot;

b) determining zero or more bit indices to be associated with a broadcast indicator bit stream of a pre-determined length based upon said determined categories of the broadcast messages from step a);

c) generating said broadcast indicator bit stream wherein bits located at said bit indices are set to an on value, and wherein all other bits in said broadcast indicator bit stream are set to an off value;

d) transmitting said broadcast indicator bit stream on a first channel during a second time slot that occurs prior to said first time slot, wherein said second time slot precedes said first time slot by a pre-determined time interval; and

e) transmitting during said first time slot an encoded bit stream that contains zero or more broadcast pointers corresponding to said categories of the broadcast messages from step a).

13. The method of claim 12, wherein the step of determining zero or more bit indices further comprises the step of hashing said categories of the broadcast messages from step 12a) via a pre-determined hashing function to determine said zero or more bit indices.

14. The method of claim 13, further comprising the step of transmitting an incoming page bit stream on the first channel.

15. The method of claim 14, wherein said first channel is a modified quick paging channel.

16. The method of claim 14, wherein said first channel is a quick paging channel.

17. The method of claim 16, further comprising the step of transmitting said broadcast indicator bit stream on a second channel, wherein said second channel is orthogonal to said first channel.

18. A method for transmitting broadcast messages in a spread spectrum telecommunications system comprising:

a) determining prior to the beginning of a first time slot the categories of the broadcast messages that will be transmitted during said first time slot by hashing;

b) determining zero or more bit indices to be associated with a broadcast indicator bit stream of a pre-determined length by hashing said categories of the broadcast messages via a pre-determined hashing function;

c) generating said broadcast indicator bit stream wherein bits located at said bit indices are set to an on value, and wherein all other bits in said broadcast indicator bit stream are set to an off value;

d) generating an incoming page bit stream;

e) generating an overlaid bit stream by overlaying said broadcast indicator bit stream onto said incoming page bit stream; and

f) transmitting said overlaid bit stream on a modified quick paging channel during a second time slot that occurs prior to said first time slot, wherein said second time slot precedes said first time slot by a pre-determined the interval.

19. An apparatus for transmitting a broadcast indicator bit stream, comprising:

a control processor for generating multiple bit streams to be transmitted wirelessly;

a convolutional encoder for convolutionally encoding the bit streams to provide error correction;

a block interleaver for interleaving bits in a bit stream provided by said convolutional encoder;

an orthogonal spreading unit for multiplying spreading codes to the bit streams received from one or more sources;

a digital modulator for modulating the bit streams provided by said orthogonal spreading unit;

a radio frequency (RF) transmitter for wirelessly transmitting the modulated data bits provided by said digital modulator;

a bidirectional bus for coupling said control processor, said block interleaver, said digital modulator, said orthogonal spreading unit, and said convolutional encoder to each other;

a bus for coupling said digital modulator to said RF transmitter; and

a control line for coupling said control processor to said RF transmitter, wherein the control processor is further configured for;

a) determining prior to the beginning of a first time slot the categories of broadcast messages that will be transmitted during said first time slot;

b) determining zero or more bit indices to be associated with the broadcast indicator bit stream of a pre-determined length based upon said determined categories of the broadcast messages from step a);

c) generating said broadcast indicator bit stream wherein bits located at said bit indices are set to an on value, and wherein all other bits in said broadcast indicator bit stream are set to an off value; and

d) providing said broadcast indicator bit stream to said orthogonal spreading unit prior to said first time slot.

20. An apparatus for receiving wireless transmissions, comprising:

a radio frequency (RF) receiver for receiving wireless transmissions of modulated data bits;

a digital demodulator for demodulating bit streams provided by said RF receiver;

an orthogonal despreading unit for multiplying spreading codes to the bit streams provided by said digital demodulator;

a block deinterleaver for deinterleaving bits in a bit stream provided by said orthogonal despreading unit;

a convolutional decoder for convolutionally decoding the bit streams provided by said block deinterleaver;

a control processor for receiving multiple bit streams;

a bidirectional bus for coupling said control processor, said block deinterleaver, said digital demodulator, said orthogonal despreading unit, and said convolutional decoder to each other;

a bus for coupling said digital demodulator to said RF receiver; and

a control line for coupling said control processor to said RF receiver, wherein the control processor is further configured for;

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

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

receiving said one or more bits;

comparing each of said one or more bits to an on or off value; and

determining from said comparison whether or not to enable said RF receiver and said convolutional decoder to subsequently receive and decode an encoded bit stream at a first time slot for use in determining whether or not to receive a broadcast message at a second time slot that occurs after said first time slot.