Method and apparatus for processing paging indicator bits transmitted on a quick paging channel

• US 6,639,907 B2
• Filed: 09/14/2001
• Issued: 10/28/2003
• Est. Priority Date: 09/26/2000
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Yao, De-Gang Richard, Melle, Ehren Van, Neufeld, Arthur J.
• Primary Examiner(s): Rao, Seema S.
• Assistant Examiner(s): Harper, Kevin C.
• Application Number:
  US09/954,667
• Publication Number:
  US 20020093920A1
• Time in Patent Office: 774 Days
• Field of Search: 370/310, 370/311, 370/313, 370/328, 370/329, 370/335, 370/342, 455/73, 455/500, 455/572, 455/574
• US Class Current: 370/342
• CPC Class Codes: H04B 1/70756 Jumping within the code, i.e. masking or slewing H04B1/70758 takes precedence
• CPC Class Codes: H04B 2201/70709 with discontinuous detection
• 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

Techniques to process data sporadically transmitted at designated times in a wireless communication system, such as paging indicator (PI) bits on the quick paging channel in cdma2000. These techniques support a sleep cycle that may start at virtually anytime and having a sleep duration selected based on a fine time increment. The increment is selected such that the finger processors and symbol combiner of a rake receiver may be easily moved to the proper positions upon waking up from a sleep. Techniques are also provided to align the symbol combiner timing to that of a particular multipath in the received signal, if necessary. With these techniques, a terminal may perform a sleep between a pair of assigned PI bits and may wake up and process a single PI bit.

Claims

1. A method of processing QPCH paging indicator bits to conserve power and extend standby in a CDMA communication system, comprising:

identifying a sleep condition; and

triggering sleep start at an arbitrary instant, thus eliminating the use of finger rolls to force a roll event in a symbol combiner.

2. In a wireless communication system, a method for processing data transmitted at designated times on a particular code channel, comprising:

identifying a sleep condition; and

performing a sleep of a duration that is a non-integer multiple of a length of a PN sequence used to spread the data prior to transmission, wherein a fractional part of the sleep duration is less than a quarter PN sequence length.

3. The method of claim 2, wherein the data corresponds to paging indicator bits transmitted on a quick paging channel (QPCH).

4. The method of claim 3, wherein the sleep is performed between a pair of paging indicator bits in a particular QPCH slot.

5. The method of claim 2, wherein the data corresponds to a page message transmitted on a paging channel (PCH).

6. The method of claim 2, wherein the data corresponds to a broadcast message transmitted on a broadcast channel.

7. The method of claim 2, wherein the sleep duration is selected as an integer multiple of a time increment that is less than a quarter of the PN sequence length.

8. The method of claim 7, wherein the time increment is selected based on masks used for masking the PN sequence.

9. The method of claim 7, wherein the time increment is selected based on the size of buffers used to store symbols.

10. The method of claim 7, wherein the time increment is selected as an integer multiple of 64 PN chips.

11. The method of claim 10, wherein the time increment is selected as 512 PN chips.

12. The method of claim 2, wherein the performing the sleep includes

removing clocks to demodulator and decoder hardware for the duration of the sleep.

13. The method of claim 2, wherein the performing the sleep includes

disabling selected ones of RF circuitry for the duration of the sleep.

14. The method of claim 2, further comprising:

generating an interrupt after waking up from the sleep.

15. The method of claim 14, wherein the interrupt is generated by hardware when clocks are re-enabled at wakeup.

16. The method of claim 14, wherein the interrupt is generated in response to completion of a signal search after wakeup.

17. The method of claim 16, wherein the signal search is programmed prior to entering the sleep.

18. The method of claim 2, wherein the sleep condition is identified if a time period between a current time and a next processing time exceeds a particular time threshold.

19. The method of claim 2, wherein the communication system is a CDMA system.

20. The method of claim 19, wherein the CDMA system implements IS-95 or cdma2000 standard.

21. A memory communicatively coupled to a digital signal processing device (DSPD) capable of interpreting digital information to:

identify a sleep condition; and

initiate a sleep of a duration that is a non-integer multiple of a length of a PN sequence used to spread the data prior to transmission, wherein a fractional part of the sleep duration is less than a quarter PN sequence length.

22. A terminal in a wireless communication system comprising:

a first controller operative to identify a sleep condition; and

a sleep controller operative to initiate a sleep of a duration that is a non-integer multiple of a length of a PN sequence used to spread the data prior to transmission, wherein a fractional part of the sleep duration is less than a quarter of PN sequence length.

23. The receiver unit of claim 22, further comprising:

a clock generator operative to disable clocks for selected circuitry within the terminal for the duration of the sleep.

24. The receiver unit of claim 22, further comprising:

a searcher element operative to provide an interrupt after wakeup from the sleep.

25. The receiver unit of claim 22, further comprising:

at least one finger processor operative to provide a PN roll event from which system time for the terminal may be reset to.