CA2218268C - Mobile unit algorithms for use in a cellular local area wireless network - Google Patents

Mobile unit algorithms for use in a cellular local area wireless network Download PDF

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Publication number
CA2218268C
CA2218268C CA002218268A CA2218268A CA2218268C CA 2218268 C CA2218268 C CA 2218268C CA 002218268 A CA002218268 A CA 002218268A CA 2218268 A CA2218268 A CA 2218268A CA 2218268 C CA2218268 C CA 2218268C
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CA
Canada
Prior art keywords
powered
mobile units
mode
radio section
transceiver
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CA002218268A
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French (fr)
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CA2218268A1 (en
Inventor
Frederic Heiman
Patrick Pinard
Andrew Werback
Michael Shiba
Robert Beach
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Symbol Technologies LLC
Original Assignee
Symbol Technologies LLC
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Filing date
Publication date
Priority claimed from US08/747,034 external-priority patent/US6002918A/en
Application filed by Symbol Technologies LLC filed Critical Symbol Technologies LLC
Priority to CA2564287A priority Critical patent/CA2564287C/en
Publication of CA2218268A1 publication Critical patent/CA2218268A1/en
Application granted granted Critical
Publication of CA2218268C publication Critical patent/CA2218268C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Mobile Radio Communication Systems (AREA)

Abstract

A communication network comprising a cellular local area wireless network includes a plurality of access points connected to a housed computer and each other, and a plurality of mobile units each mobile unit being arranged for association with an access point. The mobile units are arranged to periodically scan for and identify the most eligible access point for association on the basis of the criteria of best quality signal strength and loading factor. In order to identify when mobile units are being removed from a predetermined area, access points having directional antennae are situated adjacent exit points to detect when mobile units are in a vicinity. Each mobile unit may include paging facilities, including the capability of transmitting information in a coded form known both to the unit and to a host, and power-saving facilities.

Claims (29)

1. An arrangement for maximizing battery life in each of a plurality of portable, battery-powered, mobile units, each of the mobile units being in wireless communication with a plurality of spaced-apart, stationary access points of a communications network, the arrangement comprising:

a) a radio in each of the mobile units, the radio having a transceiver for transmitting data to and from the access points within a predetermined working range in a powered mode of network operation;

b) a processor in each of the mobile units, the processor having a controller operatively connected to the transceiver; and c) a timer in each of the mobile units, for powering the radio only during the powered mode of network operation, and for reducing power to the radio to prevent data transmission by the transceiver during a power-saving mode of operation.
2. In a communications network including a plurality of spaced-apart stationary access points each of the access points being capable of wireless communication with portable, battery-powered, mobile units when within a working range from the access points, an arrangement for maximizing battery life in each of the mobile units, the arrangement comprising:

a) a radio section in each of the mobile units, the radio section having a transceiver for transmitting data to and from the access points in a powered mode of network operation;

b) a processor section in each of the mobile units, the processor section having electronic components including a control processor operatively connected to the transceiver; and c) a timer in each of the mobile units, for powering the radio section only during the powered mode of network operation.
3. The arrangement according to claim 2, wherein the control processor reduces battery power to the processor section in a suspended mode, and wherein the control processor controls the timer to reduce battery power to the transceiver when the processor section is in the suspended mode.
4. The arrangement according to claim 2, wherein the timer is operative for reducing power to the transceiver to prevent the transceiver from transmitting data in a power-saving mode of operation.
5. The arrangement according to claim 4; and further comprising an interface between the radio and processor sections of each of the mobile units, the transceiver of a respective radio section being operation for transmitting control data to and from the control processor via the interface.
6. The arrangement according to claim 5, wherein the network includes a host computer, each of the mobile units desiring access to the host computer being operative for selecting a most eligible access point from among the access points based on the control data received by the transceiver of the respective radio section.
7. The arrangement according to claim 6, wherein the mobile unit desiring access to the host computer transmits a probe message to the access points, receives response messages from the access points, and selects the most eligible access point based on the received response messages; and wherein the timer powers the radio section to the power-saving mode for each mobile unit not associated with an access point.
8. The arrangement according to claim 4, wherein one of the electronic components is a clock for timing the control processor, and wherein the timer is operative for halting the clock in the power-saving mode.
9. The arrangement according to claim 4, wherein each access point repeatedly transmits a broadcast beacon at predetermined intervals, and wherein the control processor controls the timer to power the radio section back to the powered mode upon receipt of the beacon.
10. The arrangement according to claim 9, wherein the radio section is powered to the powered mode upon receipt of every beacon.
11. The arrangement according to claim 9, wherein the radio section is powered to the powered mode upon receipt of every other beacon.
12. The arrangement according to claim 9, wherein the radio section is powered to the powered mode upon receipt of a predetermined number of beacons.
13. The arrangement according to claim 9, wherein the radio section is powered to the powered mode based on the number of transmissions of the data in a given time period.
14. The arrangement according to claim 9, wherein the radio section is powered to the powered mode upon elapse of a fixed time interval after receipt of the beacon.
15. The arrangement according to claim 9, wherein the radio section is powered to the powered mode upon elapse of a variable time interval after receipt of the beacon.
16. In a communications network including a plurality of spaced-apart stationary access points each of the access points being capable of wireless communication with portable, battery-powered, mobile units when within a working range from the access points, a method maximizing battery life in each of the mobile units, the method comprising the steps of:

a) transmitting data to and from the access points in a powered mode of network operation by providing a transceiver in each of the mobile units;

b) providing a processor section in each of the mobile units, the processor section having electronic components including a control processor, and operatively connecting the control processor to the transceiver; and c) powering the radio section with a timer only during the powered mode of network operation.
17. The method according to claim 16, wherein the control processor reduces battery power to the processor section in a suspended mode, and further comprising the step of controlling the timer to reduce battery power to the transceiver when the processor section is in the suspended mode.
18. The method according to claim 16, wherein the powering step is performed by reducing power to the transceiver to prevent the transceiver from transmitting data in a power-saving mode of operation.
19. The method according to claim 18, and further comprising the step of transmitting control data to and from the control processor via an interface provided between the radio and processor sections of each of the mobile units.
20. The method according to claim 19, wherein the network includes a host computer, each of the mobile units desiring access to the host computer being operative for selecting a most eligible access point from among the access points.
21. The method according to claim 20, wherein the mobile unit desiring access to the host computer transmits a probe message to the access points; and receives response messages from the access points, and selects the most eligible access point based on the received response messages, and further comprising the step of powering the radio section to the power-saving mode for each mobile unit not associated with an access point.
22. The method according to claim 18, wherein one of the electronic components is a clock for timing the control processor, and further comprising the step of halting the clock in the power-saving mode.
23. The method according to claim 18, wherein each access point repeatedly transmits a broadcast beacon at predetermined intervals, and further comprising the step of controlling the timer to power the radio section back to the powered mode upon receipt of the beacon.
24. The method according to claim 23, and further comprising the step of powering the radio section to the powered mode upon receipt of each beacon.
25. The method according to claim 23, and further comprising the step of powering the radio section to the powered mode upon receipt of every other beacon.
26. The method according to claim 23, and further comprising the step of powering the radio section to the powered mode upon receipt of a predetermined number of beacons.
27. The method according to claim 23, and further comprising the step of powering the radio section to the powered mode based on the number of transmissions of the data in a given time period.
28. The method according to claim 23, and further comprising the step of powering the radio section to the powered mode upon elapse of a fixed time interval after receipt of the beacon.
29. The method according to claim 23, and further comprising the step of powering the radio section to the powered mode upon elapse of a variable time interval after receipt of the beacon.
CA002218268A 1996-11-08 1997-10-15 Mobile unit algorithms for use in a cellular local area wireless network Expired - Lifetime CA2218268C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2564287A CA2564287C (en) 1996-11-08 1997-10-15 Mobile unit algorithms for use in a cellular local area wireless network

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/747,034 US6002918A (en) 1989-06-29 1996-11-08 Power-saving arrangement and method for mobile units in communications network
US747,034 1996-11-08

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CA2564287A Division CA2564287C (en) 1996-11-08 1997-10-15 Mobile unit algorithms for use in a cellular local area wireless network

Publications (2)

Publication Number Publication Date
CA2218268A1 CA2218268A1 (en) 1998-05-08
CA2218268C true CA2218268C (en) 2007-01-16

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CA002218268A Expired - Lifetime CA2218268C (en) 1996-11-08 1997-10-15 Mobile unit algorithms for use in a cellular local area wireless network

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11074615B2 (en) 2008-09-08 2021-07-27 Proxicom Wireless Llc Efficient and secure communication using wireless service identifiers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11074615B2 (en) 2008-09-08 2021-07-27 Proxicom Wireless Llc Efficient and secure communication using wireless service identifiers
US11334918B2 (en) 2008-09-08 2022-05-17 Proxicom Wireless, Llc Exchanging identifiers between wireless communication to determine further information to be exchanged or further services to be provided

Also Published As

Publication number Publication date
CA2218268A1 (en) 1998-05-08

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Effective date: 20171016