Paging channel configuration for efficient wake-up period utilization

• US 6,480,504 B1
• Filed: 08/31/1998
• Issued: 11/12/2002
• Est. Priority Date: 08/31/1998
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Palenius, Torgny, Dent, Paul, Wang, Yi-Pin Eric
• Primary Examiner(s): MARCELO, MELVIN C
• Application Number:
  US09/144,272
• Time in Patent Office: 1,534 Days
• Field of Search: 370/311, 370/335, 370/342, 455/458
• US Class Current: 370/442
• CPC Class Codes: H04W 48/12 using downlink control channel
• 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 68/00 User notification, e.g. alerting and paging, for incoming communication, change of service or the like
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Methods and systems for optimizing standby mode power performance in radiocommunication systems are described. Techniques are providing which permit a mobile station to read synchronization symbols, e.g., long code masked symbols, in transmitted in differently numbered timeslots while minimizing wake-up time in idle mode.

Claims

1. A method for transmitting information to a remote device in a radiocommunication system comprising the steps of:

transmitting information on a control channel in control channel timeslots, each of said control channel timeslots being repeatedly transmitted in consecutive superframes, each superframe including a first number of control channel timeslots; and

transmitting paging information on a paging channel in paging timeslots, each of said paging timeslots being repeatedly transmitted in consecutive superframes, each superframe having a second number of paging timeslots, wherein said first number of control channel timeslots is different than said second number of paging timeslots.

2. The method of claim 1, wherein said first number of control channel timeslots is n and said second number of paging timeslots is n+1.

3. The method of claim 1, wherein said step of transmitting information on said control channel in control channel timeslots comprises the further step of

spreading said information to be transmitted using at least one spreading code; and

wherein said step of transmitting paging information on said paging channel in paging timeslots comprises the further step of

spreading said paging information to be transmitted using at least one spreading code.

4. The method of claim 2, wherein said second step of transmitting further comprises the step of:

transmitting one of said paging timeslots without paging information.

5. The method of claim 1, wherein said first step of transmitting further comprises the step of:

transmitting, in each control channel timeslot, a synchronization symbol, wherein a number of synchronization symbols in consecutive control channel timeslots create a frame boundary pattern.

16. The method of claim 1, wherein said control channel is a synchronization channel and said control channel timeslots include information usable by said remote device to acquire frame synchronization.

17. The method of claim 1, wherein said control channel timeslots include information usable by said remote device to identify a long code group.

20. The method of claim 1, wherein said first step of transmitting further comprises the step of:

transmitting, in each control channel timeslot, information spread by a spreading code selected from a sequence of spreading codes, wherein a number of spreading codes in consecutive control channel timeslots create a long code group identification pattern.

6. A radiocommunication system comprising:

means for transmitting information on a control channel in control channel timeslots, each of said control channel timeslots being repeatedly transmitted in consecutive superftames, each superframe including a first number of control channel timeslots; and

means for transmitting paging information on a paging channel in paging timeslots, each of said paging timeslots being repeatedly transmitted in consecutive superframes, each superframe having a second number of paging timeslots, wherein said first number of control channel timeslots is different than said second number of paging timeslots.

7. The system of claim 6, wherein said first number of control channel timeslots is n and said second number of paging timeslots is n+1.

8. The system of claim 6, wherein said means for transmitting information on said control channel in control channel timeslots further comprises

means for spreading said information to be transmitted using at least one spreading code; and

wherein said means for transmitting paging information on said paging channel in paging timeslots further comprises

means for spreading said paging information to be transmitted using at least one spreading code.

9. The system of claim 7, wherein said means for transmitting said paging information further comprises:

means for transmitting one of said paging timeslots without paging information.

10. The system of claim 6, wherein said means for transmitting said control channel information further comprises:

means for transmitting, in each control channel timeslot, a synchronization symbol, wherein a number of synchronization symbols in consecutive control channel timeslots create a frame boundary pattern.

18. The system of claim 6, wherein said control channel is a synchronization channel and said control channel timeslots include information usable by a remote device to acquire frame synchronization.

19. The system of claim 6, wherein said control channel timeslots include information usable by a remote device to identify a long code group.

21. The system of claim 6, wherein said means for transmitting said control channel information further comprises:

means for transmitting, in each control channel timeslot, information spread by a spreading code selected from a sequence of spreading codes, wherein a number of spreading codes in consecutive control channel timeslots create a long code group identification pattern.

11. A method for receiving information in a spread spectrum radiocommunication system while in standby mode comprising the steps of:

receiving information on both a control channel and a paging channel during an assigned paging timeslot in a first superframe;

changing said assigned paging timeslot after said first superframe; and

receiving information on both said control channel and said paging channel during said changed assigned paging timeslot in a second superframe.

12. The method of claim 11, further comprising the step of:

receiving, in a control channel timeslot during said first superframe and a different control channel timeslot during said second superframe, a synchronization symbol, wherein a number of synchronization symbols in consecutive control channel timeslots create a frame boundary pattern.

22. The method of claim 11, further comprising the step of:

receiving, in a control channel timeslot during said first superframe and a different control channel timeslot during said second superframe, information spread using different spreading codes, wherein a number of spreading codes used in consecutive control channel timeslots create a long code group identification pattern.

13. A mobile station comprising:

means for receiving information on both a control channel and a paging channel during an assigned paging timeslot in a first superframe;

means for changing said assigned paging timeslot after said first superframe; and

means for receiving information on both said control channel and said paging channel during said changed assigned paging timeslot in a second superframe.

14. The mobile station of claim 13, further comprising:

means for acquiring frame synchronization by decoding long code masked symbols on a plurality of differently numbered timeslots received on said control channel.

23. The mobile station of claim 13, further comprising:

means for identifying a long code group by identifying a sequence of spreading codes used to transmit information on a plurality of differently numbered timeslots received on said control channel.

15. A method for transmitting information to a remote device in a radiocommunication system comprising the steps of:

transmitting overhead information on a broadcast control channel in consecutively numbered timeslots, said consecutively numbered timeslots being repeatedly transmitted in consecutive frames;

transmitting paging information on a paging channel in consecutively numbered timeslots, said consecutively numbered timeslots being repeatedly transmitted in consecutive superframes;

assigning said remote device to at least one of said consecutively numbered timeslots associated with said paging channel; and

reading, by said remote device in each of a plurality of superframes, information transmitted by said system in said assigned timeslot of said paging channel and information transmitted by said system in a concurrently transmitted one of said consecutively numbered timeslots of said broadcast control channel, wherein said concurrently transmitted one of said consecutively numbered timeslots of said broadcast control channel is different from superframe to superframe.

24. A method for transmitting information in a spread spectrum radiocommunication system comprising the steps of:

transmitting information to a plurality of mobile stations on a control channel and to at least one particular mobile station on a paging channel during an assigned paging timeslot in a first superframe;

changing said assigned paging timeslot after said first superframe; and

transmitting information to said at least one particular mobile station on said paging channel during said changed assigned paging timeslot in a second superframe.

25. The method of claim 24, wherein said step of changing said assigned paging timeslot further comprises the step of:

remapping said at least one particular mobile station from a first paging group to a second paging group.

26. The method of claim 24, wherein said step of changing said assigned paging timeslot further comprises the step of:

incrementing said assigned paging timeslot by one.