Method for frequency mode validation for, frequency assignment for, and evaluating the network effect of a frequency plan revision within a dual mode cellular telephone system

• US 6,052,593 A
• Filed: 05/08/1997
• Issued: 04/18/2000
• Est. Priority Date: 05/08/1997
• Status: Expired due to Term

• Current Assignee: Optis Wireless Technology, LLC (Brevet Capital)
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Dufour, Daniel, Briere, Sylvain, Guimont, Vincent
• Primary Examiner(s): Vo, Nguyen
• Assistant Examiner(s): Fuller, Greta J.
• Application Number:
  US08/852,879
• Time in Patent Office: 1,076 Days
• Field of Search: 455/446, 455/434, 455/450, 455/452, 455/62, 455/552, 455/553, 455/511, 455/516, 455/437, 455/436, 455/411
• US Class Current: 455/446
• CPC Class Codes: H04W 16/04 Traffic adaptive resource partitioning
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 16/18 Network planning tools
• CPC Class Codes: H04W 28/16 Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]

Abstract

A frequency plan revision proposal is evaluated to determine whether it is compatible with the current cell configuration by insuring that sufficient frequencies having appropriate operating modes are available for assignment to meet the traffic and control channel requirements and availability of the included cell transceivers. A record is kept of previously approved proposals resulting in a revision to the frequency plan assignment. A determination is then made as to whether the current proposal if implemented would have an adverse effect on the network in view of the previously approved proposals maintained by the record. An adverse effect is found when: a sub-frequency group/frequency dropped and/or added by the proposal at issue matches or is adjacent to a sub-frequency group/frequency dropped and/or added in the record of the previously approved proposals; and the distance between the cell of the proposal at issue and the cell of the previously approved proposal in the record are within a certain threshold distance of each other.

Claims

1. A method for evaluating a proposal for a revision to a cellular frequency plan assignment for a given cell having a certain cell configuration of base station transceivers, the cell configuration further specifying at least one control channel, wherein the proposal to be evaluated identifies a plurality of sub-frequency groups to be used by the base station transceivers of the given cell for its operating frequencies, the method comprising the steps of:

determining whether the plurality of sub-frequency groups in the proposal include enough frequencies to satisfy the certain cell configuration of base station transceivers for the given cell;

determining whether the plurality of sub-frequency groups in the proposal include frequencies for use with the at least one control channel of the certain cell configuration; and

rejecting base station transceiver frequency plan assignment proposals that fail to satisfy the foregoing determining steps.

2. The method as in claim 1 wherein the given cell comprises a dual mode analog/digital cell, and the step of determining whether the plurality of sub-frequency groups in the proposal include enough frequencies to satisfy the certain cell configuration of base station transceivers for the given cell comprises the step of determining whether the plurality of sub-frequency groups in the proposal include enough analog, digital or dual mode frequencies to satisfy the certain cell configuration of analog and digital specified base station transceivers for the given cell.

3. The method as in claim 1 wherein the step of determining whether the plurality of sub-frequency groups in the proposal include frequencies for use with the at least one control channel of the certain cell configuration comprises the steps of:

identifying whether the certain cell configuration specifies the use of an analog control channel; and

determining whether the plurality of sub-frequency groups in the proposal include a frequency specified for use as an analog control channel.

4. The method as in claim 1 wherein the step of determining whether the plurality of sub-frequency groups in the proposal include frequencies for use with the at least one control channel of the certain cell configuration comprises the steps of:

identifying whether the certain cell configuration specifies the use of a digital control channel; and

determining whether the plurality of sub-frequency groups in the proposal include a frequency specified for use as a digital control channel.

5. The method as in claim 1 further including the steps of:

assigning from the plurality of sub-frequency groups in the proposal a certain one or ones of the frequencies therein to the base station transceivers as frequencies for the at least one control channel; and

assigning the remaining frequencies within the plurality of sub-frequency groups in the proposal to the base station transceivers as frequencies for traffic channels.

6. The method as in claim 5 wherein the step of assigning the remaining frequencies comprises the step of assigning the frequencies based on their top to bottom ordering within each sub-frequency group.

7. The method as in claim 5 wherein the step of assigning the remaining frequencies comprises the step of assigning the frequencies based on their bottom to top ordering within each sub-frequency group.

8. The method as in claim 5 wherein the step of assigning the remaining frequencies comprises the step of assigning the frequencies based on their least interfered to worst interfered ordering within each sub-frequency group.

9. The method as in claim 5 wherein the step of assigning the certain one or ones of the frequencies for the at least one control channel comprises the step of assigning a frequency having a specified use as an analog control channel to the base station transceiver of the certain cell configuration designated for analog control channel use.

10. The method as in claim 5 wherein the step of assigning the certain one or ones of the frequencies for the at least one control channel comprises the step of assigning a frequency having a specified use as a digital control channel to the base station transceiver of the certain cell configuration designated for digital control channel use.

11. The method as in claim 5 wherein the step of assigning the certain one or ones of the frequencies for the at least one control channel comprises the step of assigning a frequency having a digital operation authorization and being least interfered to the base station transceiver of the certain cell configuration designated for digital control channel use.

12. The method as in claim 5 wherein the given cell comprises a dual mode analog/digital cell, and the step of assigning the remaining frequencies within the plurality of sub-frequency groups comprises the step of assigning the frequencies to satisfy the certain cell configuration of analog and digital specified base station transceivers for the given cell.

13. A method for evaluating a proposal for a revision to a cellular frequency plan assignment for a given cell having a certain cell configuration of analog and digital base station transceivers, the cell configuration further specifying an analog control channel, the proposal identifying a plurality of analog, digital and/or dual mode sub-frequency groups to be used by the base station transceivers of the given cell for its operating frequencies, comprising the steps of:

determining a first sum comprising a number of the digital transceivers in the cell configuration minus a number of frequencies within the digital mode sub-frequency groups of the proposal;

determining a second sum comprising a number of the analog base station transceivers in the cell configuration minus a number of frequencies within the analog mode sub-frequency groups of the proposal;

determining a third sum comprising the sum of the first and second sums;

verifying that the third sum does not exceed a number of frequencies within the dual mode sub-frequency groups of the proposal; and

validating the base station transceiver proposal if the verification is satisfied.

14. A method for evaluating a proposal for a revision to a cellular frequency plan assignment for a given cell having a certain cell configuration of analog and digital base station transceivers, the cell configuration further specifying at least one control channel, the proposal identifying a plurality of analog, digital and/or dual mode sub-frequency groups to be used by the base station transceivers of the given cell for its operating frequencies, comprising the steps of:

determining whether the cell has an analog control channel base station transceiver, and if so, assigning a frequency within the analog mode sub-frequency group designated for control channel use to the analog control channel base station transceiver;

determining whether the cell has a digital control channel base station transceiver, and if so, assigning a frequency within either the digital or dual mode sub-frequency group to the digital control channel base station transceiver;

assigning frequencies from the digital mode sub-frequency group to the digital base station transceivers;

determining whether any digital base station transceivers have not been assigned frequencies from the digital mode sub-frequency group, and if so, assigning frequencies from the dual mode sub-frequency group to those un-assigned digital base station transceivers;

assigning frequencies from the analog mode sub-frequency group to the analog base station transceivers; and

determining whether any analog base station transceivers have not been assigned frequencies from the analog mode sub-frequency group, and if so, assigning frequencies from the dual mode sub-frequency group to those un-assigned analog base station transceivers.

15. The method as in claim 14 wherein the step of assigning a frequency within either the digital or dual mode sub-frequency group to the digital control channel base station transceiver comprises the step of assigning a frequency designated for use as a control channel to the digital control channel base station transceiver.

16. The method as in claim 14 wherein the step of assigning a frequency within either the digital or dual mode sub-frequency group to the digital control channel base station transceiver comprises the step of assigning a least interfered frequency to the digital control channel base station transceiver.

17. The method as in claim 14 wherein the step of assigning frequencies from the dual mode sub-frequency group to those un-assigned digital base station transceivers comprises the steps of:

determining whether analog or digital mode operation is preferred for the cell;

assigning least interfered ones of the frequencies from the dual mode sub-frequency group to those un-assigned digital base station transceivers if digital mode operation is preferred; and

assigning most interfered ones of the frequencies from the dual mode sub-frequency group to those un-assigned digital base station transceivers if analog mode operation is preferred.

18. A method for evaluating network effect of a proposal for a revision to a cellular frequency plan assignment for a given cell, comprising the steps of:

maintaining a record of approved proposals of other cells for revisions to the frequency plan assignment, the record identifying for each approved proposal the other cell for which the proposal was approved, a sub-frequency group dropped by the approved proposal, and a sub-frequency group added by the approved proposal;

comparing a proposal for a revision to a frequency plan assignment for a given cell, the submitted proposal identifying the given cell, a sub-frequency group to be dropped by the proposal and a sub-frequency group to be added by the proposal to the record of approved proposals to identify potential adverse network consequences from an implementation of the proposal in view of the approved proposals; and

issuing a warning regarding the proposal if potential adverse network consequences are found.

19. The method as in claim 18 wherein the step of comparing comprises the steps of:

determining if the sub-frequency group to be dropped by the proposal for the given cell is the same as the sub-frequency group added or dropped by one of the approved proposals for the other cells in the record;

calculating a distance between the given cell and the other cell in the record having the same sub-frequency group added or dropped by one of the approved proposals;

comparing the calculated distance to a threshold; and

finding potential adverse network consequences if the calculated distance is less than the threshold.

20. The method as in claim 18 wherein the step of comparing comprises the steps of:

determining if the sub-frequency group to be added by the proposal for the given cell is the same as the sub-frequency group added or dropped by one of the approved proposals for another cell in the record;

calculating a distance between the given cell and the other cell in the record having the same sub-frequency group added or dropped by one of the approved proposals;

comparing the calculated distance to a threshold; and

finding potential adverse network consequences if the calculated distance is less than the threshold.

21. The method as in claim 18 wherein the step of comparing comprises the steps of:

determining if the sub-frequency group to be dropped by the proposal for the given cell is adjacent to the sub-frequency group added or dropped by one of the approved proposals for the other cells in the record;

calculating a distance between the given cell and the other cell in the record having the adjacent sub-frequency group added or dropped by one of the approved proposals;

comparing the calculated distance to a threshold; and

finding potential adverse network consequences if the calculated distance is less than the threshold.

22. The method as in claim 18 wherein the step of comparing comprises the steps of:

determining if the sub-frequency group to be added by the proposal for the given cell is adjacent to the sub-frequency group added or dropped by one of the approved proposals for another cell in the record;

calculating a distance between the given cell and the other cell in the record having the adjacent sub-frequency group added or dropped by one of the approved proposals;

comparing the calculated distance to a threshold; and

finding potential adverse network consequences if the calculated distance is less than the threshold.

23. A method for revising a cellular frequency plan assignment for a given cell having a certain cell configuration of analog and digital base station transceivers, the cell configuration further specifying at least one control channel, comprising the steps of:

making radio environment statistics measurements useful in determining at least one reshuffling of a plurality of analog, digital and/or dual mode sub-frequency groups to be used by the base station transceivers of the given cell for its operating frequencies;

validating that the plurality of analog, digital and/or dual mode sub-frequency groups of the reshuffling include sufficient frequencies to satisfy the certain cell configuration of analog and digital base station transceivers;

assigning the frequencies of the plurality of analog, digital and/or dual mode sub-frequency groups to the analog and digital base station transceivers;

evaluating whether there is any adverse network effect to implementing the reshuffling;

verifying interference clearance of the reshuffling; and

implementing the reshuffling of base station transceiver sub-frequency groups if the evaluation is negative and the interference clearance is verified.

24. The method as in claim 23 wherein the step of making radio environment statistics measurements comprises the step of measuring uplink interference on the frequencies of the plurality of analog, digital and/or dual mode sub-frequency groups.

25. The method as in claim 23 wherein the step of validating comprises the steps of:

determining whether the plurality of sub-frequency groups in the reshuffling include enough frequencies to satisfy the certain cell configuration of base station transceivers for the given cell; and

determining whether the plurality of sub-frequency groups in the reshuffling include frequencies for use with the at least one control channel of the certain cell configuration.

26. The method as in claim 23 wherein the step of assigning comprises the steps of:

assigning from the plurality of sub-frequency groups in the reshuffling certain one or ones of the frequencies therein to the base station transceivers as frequencies for the at least one control channel; and

assigning the remaining frequencies within the plurality of sub-frequency groups in the reshuffling to the base station transceivers as frequencies for traffic channels.

27. The method as in claim 23 wherein the step of evaluating comprises the steps of:

maintaining a record of approved reshufflings for other cells, the record identifying for each approved reshuffling the other cell for which the reshuffling was approved, a sub-frequency group dropped by the approved reshuffling, and a sub-frequency group added by the approved reshuffling;

comparing the reshuffling for a given cell to the record of approved reshufflings to identify potential adverse network consequences from an implementation of the reshuffling in view of the approved reshufflings; and

issuing a warning regarding the reshuffling if potential adverse network consequences are found.

28. The method as in claim 27 wherein the step of comparing comprises the steps of:

determining whether a sub-frequency group added or dropped by the reshuffling for the given cell matches or is adjacent to a sub-frequency group added or dropped by the approved reshufflings for the other cells;

calculating a distance between the given cell and the other cell in the record having the matching or adjacent sub-frequency groups;

comparing the calculated distance to a threshold; and

finding potential adverse network consequences if the calculated distance is less than the threshold.

29. The method as in claim 23 wherein the step of verifying comprises the step of measuring downlink interference on the frequencies of the plurality of analog, digital and/or dual mode sub-frequency groups within the reshuffling.