EP0621707A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Frequency hopping pattern assignment and control in multiple autonomous collocated radio networks
Assignee: International Business Machines Corp
•
Filing: 1994-04-13
•
Granted: —
•
Expires: 2014-04-13
Abstract
Abstract A control system for automated management of frequency-hopping in a radio network. The system includes a Wireless Network Manager (WNM) or Controller and a Wireless Control Agent (WCA), which control the distribution and maintenance of hopping patterns in the radio network. In a single cell network, the WNM and the WCA are included in a single base station. In a multiple cell network, the WNM is in a specific station on a LAN, and a WCA is located in each base station on the LAN. In each instance, the WNM is a centralized managing station and the WCA acts as a cell controller.
Inventors
- 👤 David Frederick Bantz
- 👤 Jaques Frederick Bauchot
- 👤 Chia-Chi Huang
- 👤 Fabien Patrick Lanne
- 👤 Kadathur S. Natarajan
- 👤 Michelle M. Wetterwald
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 09:22
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/713; H04B1/715; H04B2001/7154; H04B1/7156; H04B2001/71563; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
217 words
A method of dynamically managing frequency hopping in a wireless communication network comprised of a local area network connected to a plurality of base stations, each of which has a geographic area, defined as a cell, within which mobile stations can communicate with a base station, with each such base station being capable of performing bidirectional wireless communication with one or more of said mobile stations under control of a controller, said method comprising the steps of: (a) requesting by a given base station a frequency hopping pattern assignment from said controller; (b) monitoring by said given base station the frequency hopping pattern of the other ones of said plurality of base stations; (c) requesting by said given base station a new frequency hopping pattern if another one of said plurality of base stations is using the same frequency hopping pattern as said given base station; (d) beginning frequency hopping by said given base station; (e) monitoring by said given base station interference relative to the assigned frequency hopping pattern; (f) determining by said given base station if frequency hopping pattern revision is necessary as the result of the monitoring of interferences; and (g) returning to step (b) if revision is necessary, and if revision is not necessary, continuing to hop with the same frequency hopping pattern.
Claim 2
Dependent Claim
78 words
The method of claim 1, wherein step (a) includes said controller performing the steps of: (a1) selecting a frequency hopping pattern from a predetermined set of frequency hopping patterns; (a2) determining if the selected frequency hopping pattern has been previously assigned to another one of said plurality of base stations; (a3) returning to step (a1) if the selected frequency hopping pattern has previously been assigned; and (a4) communicating the selected frequency hopping pattern to said given base station.
Claim 3
Dependent Claim
59 words
The method of claim 1 or 2, wherein step (b) includes the steps of: (b1) locking into the frequency hopping pattern of another base station to learn its frequency hopping pattern; (b2) comparing the frequency hopping patterns; and (b3) requesting a new frequency hopping pattern by said given base station if the frequency hopping patterns compare with predetermined limits.
Claim 4
Independent Claim
36 words
The method of at least one of claims 1 to 3, wherein step (e) includes the steps of: (e1) classifying interference into predetermined groups; and (e2) controlling the interference based on which group it falls into.
Claim 5
Dependent Claim
19 words
The method of claim 4, wherein the predetermined groups of interference include periodic interference, continuous interference and bursty interference.
Claim 6
Dependent Claim
39 words
The method of claim 5, including the steps of: (E1) controlling periodic interference by a hop insert and delete technique; (E2) controlling continuous interference by a pattern replacement technique; and (E3) controlling bursty interference by a hop advance technique.
Claim 7
Independent Claim
232 words
A method of dynamically managing interference in a wireless communication network comprised of a local area network connected to a plurality of base stations, each of which has a geographic area, defined as a cell, within which mobile stations can communicate with a base station, with each such base station being capable of performing bidirectional wireless communication with one or more of said mobile stations under control of a controller, said method comprising the steps of: maintaining an Inactive Channel Table (ICT) in said controller for keeping track of the inactive hopping frequencies in said network, including the time of last use of a hopping frequency, the last time a hopping frequency was replaced and the base stations involved; maintaining an Active Channel Table (ACT) in each of said base stations for keeping track of whether a given hopping frequency is good or bad and if it has been deleted within a predetermined time; determining if a given hopping frequency is bad at a given base station, and updating ACT to reflect that the given hopping frequency is bad; requesting a new hopping frequency from said controller in response to determining the given hopping frequency is bad; selecting said new hopping frequency from the ICT by said controller, and updating ICT to reflect the selection; and sending the new hopping frequency to each base station that was using the bad hopping frequency.
Claim 8
Dependent Claim
37 words
The method of claim 7, wherein the step of selecting said new hopping frequency includes the step of: finding another frequency in said ICT that is a predetermined number of frequencies away from said given hopping frequency.
Claim 9
Dependent Claim
93 words
The method of claim 8, wherein the step of finding another frequency includes the steps of: determining if there is an unused frequency in said ICT that is more than said predetermined number of frequencies away from said given hopping frequency, and if there is, selecting it as said new hopping frequency, and if there is not; determining if there is an unused frequency in said ICT that is less than said predetermined number of frequencies away from said given hopping frequency, and if there is, selecting it as said new hopping frequency.
Claim 10
Dependent Claim
228 words
Apparatus for dynamically managing frequency hopping in a wireless communication network comprised of a local area network connected to a plurality of base stations, each of which has a geographic area, defined as a cell, within which mobile stations can communicate with a base station, with each such base station being capable of performing bidirectional wireless communication with one or more of said mobile stations under control of a controller, comprising: (a) means for requesting by a given base station a frequency hopping pattern assignment from said controller; (b) means for monitoring by said given base station the frequency hopping pattern of the other ones of said plurality of base stations; (c) means for requesting by a said given base station a new frequency hopping pattern if another one of said plurality of base stations is using the same frequency hopping pattern as said given base station; (d) means for beginning frequency hopping by said given base station; (e) means for monitoring by said given base station interference relative to the assigned frequency hopping pattern; (f) means for determining by said given base station if frequency hopping pattern revision is necessary as the result of the monitoring of interferences; and (g) means for returning to (b) if revision is necessary, and if revision is not necessary, including means for continuing to hop with the same frequency hopping pattern.
Claim 11
Dependent Claim
237 words
Apparatus for dynamically managing a wireless communication network comprised of a local area network connected to a plurality of base stations, each of which has a geographic area, defined as a cell, within which mobile stations can communicate with a base station, with each such base station being capable of performing bidirectional wireless communication with one or more of said mobile stations under control of a controller comprising: an Inactive Channel Table (ICT) in said controller for keeping track of the inactive hopping frequencies in said network, including the time of last use of a hopping frequency, the last time a hopping frequency was replaced and the base stations involved; an Active Channel Table (ACT) in each of said base stations for keeping track of whether a given hopping frequency is good or bad and if it has been deleted within a predetermined time; means for determining if a given hopping frequency is bad at a given base station, including means for updating ACT to reflect that the given hopping frequency is bad; means for requesting a new hopping frequency from said controller in response to determining the given hopping frequency is bad; means for selecting said new hopping frequency from the ICT by said controller, including means for updating ICT to reflect the selection; and means for sending the new hopping frequency from said controller to each base station that was using the bad hopping frequency.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.