Power management system for a mobile station

• US 6,044,069 A
• Filed: 10/29/1997
• Issued: 03/28/2000
• Est. Priority Date: 10/29/1997
• Status: Expired due to Term

• Current Assignee: Commx Wireless LLC (Novelision Holding LLC)
• Original Assignee: Conexant Systems Incorporated (Synaptics Incorporated)
• Inventors: Wan, Yongbing
• Primary Examiner(s): Patel, Ajit
• Application Number:
  US08/959,588
• Time in Patent Office: 881 Days
• Field of Search: 370/311, 370/328, 370/329, 370/337, 370/341, 370/347, 455/434, 455/38.3, 455/922, 455/38.2, 455/343, 455/515, 455/412, 455/414-420, 455/574, 455/458
• US Class Current: 370/311
• 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 52/0293 having a sub-controller with a low clock frequency switching on and off a main controller with a high clock frequency
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A power management system for a mobile station reduces standby mode processing by receiving and processing single time slots of a short paging channel. Each single time slot of a short paging channel includes a mobile station identifier which alerts a receiving mobile station that a pending telephone call or paging message may be directed to the mobile station. Once so alerted, the mobile station receives and processes full paging channels comprising four time slots to determine whether the mobile station is the intended recipient of the telephone call or paging message. If the mobile station determines that it is not the intended recipient, then the mobile station resumes receiving and processing single time slots of the short page channel. Processing fewer time slots of data for purposes of call detection conserves mobile station battery power.

Claims

1. A mobile station comprising:

a software instruction processing unit;

a software instruction storage comprising a computer-readable medium, said software instruction storage accessible to said software instruction processing unit;

a short page channel receiving module stored in said software instruction storage, said short page channel receiving module including receiving instructions executed by the software instruction processing unit, said receiving instructions causing said mobile station to scan broadcast information in a wireless communication network for a short page channel and to receive a single time slot of said short page channel containing one group of call alert data, said wireless communication network operating in accordance with the GSM standard, said single time slot less than one millisecond in duration and representing less than 128 data bits; and

a short page processing module stored in said software instruction storage, said short page processing module including processing instructions executed by the software instruction processing unit, said processing instructions causing said mobile station to process said one group of call alert data and to determine from said group of call alert data whether a pending telephone call or paging message may have been directed to the mobile station.

2. The mobile station as described in claim 1, further comprising:

an idle state wherein the mobile station docs not scan for a short page channel or receive or process call alert information, the mobile station entering said idle state during a time period between broadcasts of said short page channel; and

a battery providing power to the mobile station, the mobile station consuming said power at a first rate during said scanning for said short page channel and during receiving or processing said call alert information, the mobile station consuming said power at a second rate in said idle state, said second rate being less than said first rate.

3. The mobile station as described in claim 2, further comprising:

a master clock; and

a low precision clock, said low precision clock being sufficiently precise to time the receipt of a single short page channel time slot, said low precision clock less precise than said master clock, said low precision clock consuming less power during a time interval than said master clock, said low precision clock timing said idle state, said master clock shut down during said idle state.

4. A mobile station, comprising:

a call alert module structured to extract an alert message from transmitted call alert data, said call alert module responding to call alert data received from a call alert channel of a wireless communication system by determining whether a pending telephone call or paging message may be directed to the mobile station, and by so alerting said mobile station; and

a paging module structured to extract a paging message from transmitted paging data, said paging module responding to paging data received from a paging channel of said wireless communication system by determining whether said telephone call or paging message is directed to the mobile station, said call alert data requiring less processing than said paging data.

5. The mobile station as described in claim 4, further comprising:

a call establishment module which initiates the establishment of a communication link to a communication device responsible for initiating said telephone call or paging message, said call establishment module invoked upon said determining that said telephone call or paging message is directed to the mobile station.

18. The mobile station as described in claim 4, wherein said paging module is invoked upon said alerting said mobile station that a pending telephone call or paging message may be directed to the mobile station.

6. A mobile station, comprising:

a short page module structured to extract paging data from a time slot of a short page channel transmitted by a wireless communication system operating in accordance with the GSM standard, said short page module responding to receipt of said time slot by determining from said paging data in said time slot that a telephone call or paging message may have been directed to said mobile station, said time slot less than one millisecond in duration and representing less than 128 bits; and

a paging module, said paging module responding to receipt of four time slots of a paging channel by determining whether the mobile station is the intended recipient of a telephone call or paging message, said paging module invoked upon said determination that a telephone call or paging message may have been directed to said mobile station.

7. The mobile station as described in claim 6, further comprising:

a call establishment module which initiates the establishment of a communication link to a communication device responsible for initiating said telephone call or paging message, said call establishment module invoked upon said determining that said mobile station is the intended recipient of said telephone call or paging message.

8. The mobile station described in claim 7, further comprising:

a data storage area; and

a short page identity value stored in said data storage area, said short page module comparing a mobile station identity value in said call alert data to said short page identity value to make said determination that said telephone call or paging message may have been directed to said mobile station.

9. A cellular system comprising:

a base station;

a cell;

a receiver in said cell;

a battery powering said receiver;

an alert channel in which said base station transmits within said cell alert information to alert said receiver of a pending telephone call or paging message; and

a paging channel in which said base station transmits within said cell paging information to notify said receiver that said receiver is the intended recipient of said telephone call or paging message, the processing of said paging information consuming more power of said battery than the processing of said alert information.

10. The cellular system as described in claim 9, further comprising:

receiver identity information within said alert information, said receiver identity information not uniquely identifying said receiver.

11. The cellular system as described in claim 9, further comprising:

a communication channel used by said receiver to establish a communication link following said receiver receiving paging information notifying said receiver that said receiver is the intended recipient of said telephone call or paging message.

12. A mobile station with reduced standby processing requirements, comprising:

a data storage area;

a paging group value stored in said data storage area, said paging group value specifying first paging channels, said paging group value assigned to said mobile station by a mobile switching center;

a paging channel skipping value stored in said data storage area, said paging channel skipping value specifying a subset of said first paging channels, said subset identifying paging channels transmitted less frequently than said first paging channels; and

a short paging group value identifying a subset of multiframes transmitted by said mobile switching center and identifying a time slot in each of said subset of multiframes, said mobile station receiving data represented in each identified time slot and determining from said data whether a pending telephone call or paging message may have been directed to said mobile station, said mobile station receiving and processing said subset of said first paging channels only upon said determining that a pending telephone call or paging message may have been directed to said mobile station, said mobile station determining from said processing of said subset of said first paging channels whether said pending telephone call or paging message was directed to said mobile station.

19. The mobile station with reduced standby processing requirements as described in claim 12, further comprising:

a short page channel distribution value extracted from data transmitted over a broadcast channel, said mobile station using said short page channel distribution value to calculate said short paging group value.

13. A mobile station with reduced requirements for processing broadcast control data, said mobile station comprising:

a data storage area;

a short page channel data buffer in said data storage area including a bit reserved for updating broadcast control information, said bit received by said mobile station from a time slot of a TDMA frame;

a software instruction storage in a computer-readable medium; and

a broadcast control update module stored in said software instruction storage, said broadcast control update module responding to receipt of said bit by comparing said bit to a prior received bit stored in said data storage area and, if said compared bits differ, directing the mobile station to receive and process a next transmitted broadcast control channel to update communication parameters of the mobile station and storing the newly received bit in place of the prior received bit.

14. A wireless communication system comprising:

a mobile switching center, said mobile switching center generating a first single time slot of a short page channel, said first single time slot including a first mobile station identifier value, said mobile switching center transmitting said first single time slot to a base station, said mobile switching center generating a paging channel having four time slots, said four time slots including a second mobile station identifier, said mobile switching center transmitting said four time slots to said base station;

a base station which receives said first single time slot and said four time slots, said base station transmitting to a cell said first single time slot in a short page channel and said four time slots in a paging channel; and

a mobile station in said cell, said mobile station identified by said first mobile station identifier and by said second mobile station identifier, said mobile station receiving said first single time slot from said short page channel and extracting said first mobile station identifier from said first single time slot to determine that a pending telephone call or paging message may be directed to said mobile station, said mobile station, upon said determination, receiving said four time slots from said paging channel and extracting said second mobile station identifier to conclude that said mobile station is the intended recipient of said telephone call or paging message, said mobile station, upon said conclusion, initiating call establishment procedures to create a communication link between said mobile station and a communication device responsible for initiating said telephone call or paging message.

15. The wireless communication system as described in claim 14, further comprising:

a broadcast control update bit, said update bit included in said first single time slot, said update bit having a first value if the content of a most recently transmitted broadcast control channel in said cell did not change from the content of an immediately preceding broadcast control channel transmitted in said cell, said bit having a second value if the content of the said recently transmitted broadcast control channel is different from the content of said immediately preceding broadcast control channel, said mobile station extracting said update bit from said first single time slot and, if said update bit has said second value, then said mobile station receiving and processing a next transmitted broadcast control channel.

16. The wireless communication system as described in claim 14, further comprising:

a data storage area in said mobile station;

a paging group value stored in said data storage area, said paging group value specifying first paging channels, said paging group value assigned to said mobile station by said mobile switching center; and

a paging channel skipping value stored in said data storage area, said paging channel skipping value specifying a subset of said first paging channels, said subset identifying paging channels transmitted less frequently than said first paging channels, said mobile station receiving and processing said subset of said first paging channels.

17. The wireless communication system as described in claim 16, further comprising:

a master clock timing said receipt of said four time slots by said mobile station;

a second single time slot, said mobile switching center transmitting said second single time slot to said base station, said base station transmitting to said cell said second single time slot in said short page channel, said mobile station receiving said second single time slot from said short page channel upon determining from said receipt of said first single time slot that a pending telephone call or paging message is not directed to said mobile station; and

a low precision clock timing the duration of an idle state wherein said mobile station does not receive, transmit, or process data, said duration of said idle state occurring after said receipt by said mobile station of said first single time slot and before said receipt by said mobile station of said second single time slot, said second single time slot containing sufficient synchronization bits to permit said receipt of said second single time slot, said master clock shut down during said idle state, said low precision clock consuming less power during a time interval than said master clock.