Method and apparatus for maximizing standby time using a quick paging channel

• US 6,421,540 B1
• Filed: 02/19/1999
• Issued: 07/16/2002
• Est. Priority Date: 05/30/1997
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Agrawal, Avneesh, Bender, Paul E., Gilhousen, Klein S., Butler, Brian K.
• Primary Examiner(s): Bost, Dwayne
• Assistant Examiner(s): GELIN, JEAN ALLAND
• Application Number:
  US09/252,846
• Time in Patent Office: 1,243 Days
• Field of Search: 455/458, 455/459, 455/31.3, 455/38.1, 455/434, 455/425, 455/450, 455/451, 455/452, 455/455, 455/509, 455/9, 455/464, 455/511, 455/62, 455/515, 370/335, 370/365, 370/322, 370/337, 370/311, 370/336, 370/342, 370/333, 370/329, 370/461, 370/462, 340/7.2, 340/7.33, 340/7.42
• US Class Current: 455/458
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0068 by puncturing
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff
• CPC Class Codes: H04W 52/44 in connection with interruption of transmission
• CPC Class Codes: H04W 52/58 Format of the TPC bits
• CPC Class Codes: H04W 68/025 Indirect paging
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A quick paging system having a base station, a plurality of terminals, and a full paging channel having a plurality of slots for transmitting paging information to the terminals is described. A quick paging channel having a plurality of quick paging channel slots each corresponding to a full paging channel slot is provided wherein at least one indicator is positioned within a selected quick paging channel slot that instructs at least one selected terminal corresponding to the at least one indicator in the quick paging slot to monitor the corresponding full paging channel slot.

Claims

1. A quick paging system having a base station, a plurality of terminals, and a full paging channel having a plurality of slots for transmitting paging information to the terminals, comprising:

a quick paging channel having a plurality of quick paging channel slots each corresponding to a full paging channel slot;

at least one indicator positioned within a selected quick paging channel slot that instructs at least one selected terminal corresponding to the at least one indicator in the quick paging slot to monitor the corresponding full paging channel slot;

wherein said quick paging channel is modulated using on-off keying modulated direct sequence spread spectrum;

wherein the least one indicator is placed at selected positions within said quick paging channel slot which are determined from a plurality of positions within the selected quick paging channel slot according to a time value, wherein the selected positions are determined by applying a hashing function to the time value.

2. The quick paging system of claim 1, wherein an absence of the indicator instructs the selected terminal not to monitor the full paging channel slot.

3. The quick paging system of claim 1, wherein the at least one indicator comprises a single bit for instructing the selected terminal to monitor the full paging channel slot.

4. The quick paging system of claim 1, including an identification number associated with the selected terminal wherein the hashing function is applied to the identification number.

5. The quick paging system of claim 1, wherein each of the quick paging channel slots is divided into a plurality of subslots, each of the subslots includes a plurality of indicator positions, a first indicator is disposed within a first indicator position of a first subslot.

6. The quick paging system of claim 5, wherein and a second indicator is disposed within a second indicator position of a second subslot.

7. The quick paging system of claim 6, wherein the first and second indicator positions are selected according to a hash function applied to a time value.

8. The quick paging system of claim 6, wherein the location of the first indicator position within the first subslot differs from the location of the second indicator position within the second subslot.

9. The quick paging system of claim 1, wherein a presence of the indicator is detected by comparing a power level of the quick paging channel with a threshold value.

10. The quick paging system of claim 9, including a pilot channel wherein the threshold value is determined according to a power level of the pilot channel.

11. The quick paging system of claim 1, wherein the paging information is located in a selected paging channel slot on the full paging channel and the quick paging channel slot and the selected paging slot on the full paging channel are offset in time with respect to each other.

12. The quick paging system of claim 1, wherein a location of an indicator in a predetermined subslot of the selected quick paging channel slot is prohibited in order to provide a minimum amount of time between the indicator and any paging information transmitted to the selected terminal.

13. The quick paging system of claim 1, wherein a determination is made of the reliability of the detection of the indicator and the indicator is erased according to the determination.

14. The quick paging system of claim 13, including a pilot channel wherein the reliability determination is made according to a power level present in the pilot channel.

15. The quick paging system of claim 1, wherein an indicator position is reserved for an indicator instructing all terminals of the plurality of terminals to monitor the full paging channel.

16. The quick paging system of claim 1, wherein an indicator position is reserved for an indicator instructing all terminals of the plurality of terminals not to monitor the full paging channel.

17. The quick paging system of claim 1, wherein the indicator is modulated in the quick paging channel using on-off keying.

18. The quick paging system of claim 1, wherein the selected terminal remains in a standby mode until at least one indicator within the message position of the selected quick paging channel slot is received by the selected terminal.

19. The quick paging system of claim 1, wherein the selected quick paging channel slot includes a multi-bit message packet.

20. The quick paging system of claim 19, wherein the multi-bit message packet contains a message instructing all terminals in the plurality of terminals to monitor the full paging channel.

21. The quick paging system of claim 1, wherein the multi-bit message packet contains a message instructing all terminals in the plurality of terminals not to monitor the full paging channel.

22. A communication system having at least one base station and at least one remote station, wherein said at least one base station transmits messages in slots of a full paging channel and said at least one remote station monitoring predetermined slots of said full paging channel for messages intended therefor, said communication system further comprising said at least one base station transmitting indicators in slots of a quick paging channel wherein said at least one remote station monitors predetermined indicators in predetermined quick paging channel slot and responsive thereto for monitoring a predetermined slot on said paging channel;

wherein said quick paging channel is modulated using on-off keying modulated direct sequence spread spectrum;

wherein the least one indicator is placed at selected positions within said quick paging channel slot which are determined from a plurality of positions within the selected quick paging channel slot according to a time value, wherein the selected positions are determined by applying a hashing function to the time value.

23. A base station for station transmitting messages in slots of a full paging channel further comprising a quick paging channel in which indicators in slots of a quick paging channel are transmitted wherein said at least one remote station monitors predetermined indicators in predetermined quick paging channel slot and responsive thereto for monitoring a predetermined slot on said paging channel;

wherein said quick paging channel is modulated using on-off keying modulated direct sequence spread spectrum;

wherein the least one indicator is placed at selected positions within said quick paging channel slot which are determined from a plurality of positions within the selected quick paging channel slot according to a time value, wherein the selected positions are determined by applying a hashing function to the time value.

24. A communication system having at least one base station and at least one remote station, wherein said at least one base station transmits messages in slots of a full paging channel and said at least one remote station monitoring predetermined slots of said full paging channel for messages intended therefor, said at least one base station transmitting indicators in slots of a quick paging channel, said communication system further comprising said at least one remote station monitors predetermined indicators in predetermined quick paging channel slot and responsive thereto for monitoring a predetermined slot on said paging channel;

wherein said quick paging channel is modulated using on-off keying modulated direct sequence spread spectrum;

wherein the least one indicator is placed at selected positions within said quick paging channel slot which are determined from a plurality of positions within the selected quick paging channel slot according to a time value, wherein the selected positions are determined by applying a hashing function to the time value.

25. A remote station for monitoring predetermined slots of a base station transmitted full paging channel for messages intended therefor, said remote station further comprising a quick paging channel monitor for monitoring predetermined indicators in predetermined slots of a quick paging channel and responsive thereto for monitoring a predetermined slot on said paging channel;

wherein said quick paging channel is modulated using on-off keying modulated direct sequence spread spectrum;

wherein the least one indicator is placed at selected positions within said quick paging channel slot which are determined from a plurality of positions within the selected quick paging channel slot according to a time value, wherein the selected positions are determined by applying a hashing function to the time value.

26. In a quick paging system having a base station, a plurality of terminals, and a full paging channel for transmitting paging information to the terminals, a method for paging a terminal, comprising the steps of:

transmitting terminal specific indicators in terminal specific positions in slots of a quick paging channel; and

monitoring at a terminal respective terminal specific positions for terminal specific indicators in predetermined slots of said quick paging channel; and

monitoring at each terminal in response to a detection of terminal specific indicators said full paging channel;

wherein said quick paging channel is modulated using on-off keying modulated direct sequence spread spectrum;

wherein the least one indicator is placed at selected positions within said quick paging channel slot which are determined from a plurality of positions within the selected quick paging channel slot according to a time value, wherein the selected positions are determined by applying a hashing function to the time value.