Concurrently coordinated microwave paths in coordinated frequency bands

• US 8,078,109 B1
• Filed: 04/14/2008
• Issued: 12/13/2011
• Est. Priority Date: 04/13/2007
• Status: Active Grant

• Current Assignee: Wireless Strategies, Inc.
• Original Assignee: Wireless Stategies Incorporated
• Inventors: Mulcay, Michael
• Primary Examiner(s): Milord, Marceau
• Application Number:
  US12/102,766
• Time in Patent Office: 1,338 Days
• Field of Search: 455/63.1, 455445-449, 455/454, 455/67.15, 455/456.4, 455/114.2, 455/503, 455/562.1, 370/322, 370/354, 370/280, 370/312
• US Class Current: 455/63.1
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition

Abstract

Methods, systems, and apparatus, for operation of concurrently coordinated microwave paths in coordinated frequency bands are described. In one aspect, a system includes a plurality of primary sites, each primary site including a transceiver portion configured to transmit to or receive from the transceiver portion of another primary site on a coordinated microwave path on a first frequency; a secondary site, the secondary site located in an optimized area, the secondary site including a transceiver portion, the transceiver portion of the secondary site configured to transmit to the transceiver portion of a primary site on a concurrently coordinated microwave path on the first frequency, where the optimized area is an area where interference caused by the secondary site to other transceivers that operate on a different coordinated microwave path on the first frequency is less than interference caused by a primary site to the other transceivers.

Claims

1. A system for operating a concurrently coordinated microwave path in a coordinated frequency pair, comprising:

a first base station at a first site, the first base station comprising a transceiver portion;

a second base station at a second site, the second base station comprising a transceiver portion, wherein the transceiver portion of the first base station and the transceiver portion of the second base station are configured to provide a first coordinated microwave path on a frequency pair from the first base station to the second base station using frequency division duplex (FDD) and to provide a second coordinated microwave path from the second base station to the first base station on the frequency pair using FDD such that a first frequency and a second frequency of the frequency pair operate with frequency division duplex-time division duplex (FDD-TDD) so as to cause co-channel interference;

a third base station at a third site, the third base station comprising a transceiver portion, wherein the transceiver portion of the second base station and the transceiver portion of the third base station are configured provide a third coordinated microwave path on the frequency pair from the third base station to the second base station using FDD and to provide a fourth coordinated microwave path from the second base station to the third base station on the frequency pair using FDD such that the first frequency and the second frequency of the frequency pair operate with frequency division duplex-time division duplex (FDD-TDD) so as to cause co-channel interference; and

a fourth site, the fourth site located in an optimized area defined by and including the union of a first coordination area of the first base station, a second coordination area of the second base station and a third coordination area of the third base station, the optimized area being subject to the co-channel interference created by transmitting from the first base station, the second base station and the third base station as a result of which no foreign transceiver can operate on a different coordinated microwave path on the first frequency or the second frequency in the optimized area without being subjected to or causing interference greater than a permissible level, the fourth site comprising a transceiver portion, the transceiver portion of the fourth site configured to transmit to a side lobe portion of the transceiver portion of the first site or the second site on a concurrently coordinated microwave path on the first frequency using time division multiplexing such that interference caused by the transceiver portion of the fourth site to other transceivers that operate on a different coordinated microwave path on the first frequency is less than interference caused by the transceiver portion of the third site to the other transceivers.

2. A method for operating a concurrently coordinated microwave path in a coordinated frequency pair, comprising:

in an optimized area defined by and including the union of a first coordination area of a first base station at a first site, a second coordination area of a second base station at a second site and a third coordination area of a third base station at a third site, the optimized area being subject to co-channel interference created by transmitting from the first base station to the second base station on a first coordinated microwave path and from the second base station to the first base station on a second coordinated microwave path using a frequency pair with frequency division duplex-time division duplex (FDD-TDD) and by transmitting from the third base station to the second base station on a third coordinated microwave path and from the second base station to the third base station using the frequency pair with frequency division duplex-time division duplex (FDD-TDD) as a result of which no foreign transceiver can operate on a different coordinated microwave path on a first frequency and a second frequency of the frequency pair in the optimized area without being subjected to or causing interference greater than a permissible level, transmitting on a concurrently coordinated microwave path from a transceiver portion of a fourth site to a side lobe portion of a transceiver portion of the first base station or the second base station on the first frequency using time division multiplexing such that interference caused by the transceiver portion of the fourth site to other transceivers that operate on a different coordinated microwave path on the first frequency is less than interference caused by the transceiver portion of the third site to the other transceivers.

3. A method for operating a concurrently coordinated microwave path in a coordinated frequency pair, comprising:

in an optimized area defined by and including the union of a first coordination area of a first base station at a first site, a second coordination area of a second base station at a second site and a third coordination area of a third base station at a third site, the optimized area being subject to co-channel interference created by transmitting from the first base station to the second base station on a first coordinated microwave path and from the second base station to the first base station on a second coordinated microwave path using a frequency pair with frequency division duplex-time division duplex (FDD-TDD) and by transmitting from the third base station to the second base station on a third coordinated microwave path and from the second base station to the third base station using the frequency pair with frequency division duplex-time division duplex (FDD-TDD) as a result of which no foreign transceiver can operate on a different coordinated microwave path on a first frequency and a second frequency of the frequency pair in the optimized area without being subjected to or causing interference greater than a permissible level, transmitting on a concurrently coordinated microwave path from a side lobe portion of a transceiver portion of the first base station or the second base station to a transceiver portion of a fourth site on the first frequency using time division multiplexing, such that interference caused by the transceiver portion of the fourth site to other transceivers that operate on a different coordinated microwave path on the first frequency is less than interference caused by the transceiver portion of the third site to the other transceivers.

4. A method comprising:

for an optimized area, a transceiver portion of a first site configured to transmit on a concurrently coordinated microwave path to a second site or a third site on a first frequency, the second site comprising a transceiver portion, a transceiver portion of the third site configured to receive from the transceiver portion of the second site on a coordinated microwave path on the first frequency;

determining a configuration for a fourth site, where interference caused by the first site to other transceivers that operate on a different coordinated microwave path on the first frequency is less than interference caused by the fourth site to the other transceivers;

where determining a configuration for the fourth site includes;

selecting settings for one or more parameters of the fourth site, the parameters including the location for an antenna, the orientation of the antenna, the gain of the antenna, or the power of the transceiver portion;

estimating the interference from the transceiver portion of the fourth site to a transceiver portion of one or more sites that operate on a different coordinated microwave path on the first frequency; and

estimating the interference from the transceiver portion of the first site to the transceiver portion of the one or more sites.

5. The method of claim 4, where the one or more sites are existing sites.

6. The method of claim 4, where the one or more sites are modeled future sites.

7. The method of claim 4, where the interference is calculated according to the expression:

TrxEIRP+AFrx−

96.6−

20 log(Fo)−

20 log(D), where;

TrxEIRP=Equivalent Isotropic Radiated Power of the transceiver portion of a site in dBm;

AFrx=antenna gain of another site that operates on a different coordinated microwave path at an angle directly towards the transceiver portion of the site in dBi;

Fo=frequency of operation in GHz; and

D=distance, in miles, between the sites.

8. An auxiliary station comprising:

a transceiver portion located in an optimized area defined by and including the union of a first coordination area of a first base station at a first site, a second coordination area of a second base station at a second site and a third coordination area of a third base station at a third site, the optimized area being subject to co-channel interference created by transmitting from the first base station to the second base station on a first coordinated microwave path and from the second base station to the first base station on a second coordinated microwave path using a frequency pair with frequency division duplex-time division duplex (FDD-TDD) and by transmitting from the third base station to the second base station on a third coordinated microwave path and from the second base station to the third base station using the frequency pair with frequency division duplex-time division duplex (FDD-TDD) as a result of which no foreign transceiver can operate on a different coordinated microwave path on a first frequency and a second frequency of the frequency pair in the optimized area without being subjected to or causing interference greater than a permissible level, the transceiver portion located at a fourth site in the optimized area and configured to transmit and receive from a side lobe portion of a transceiver portion of the first base station or the second base station on a concurrently coordinated microwave path on a first frequency using time division multiplexing, such that interference caused by the transceiver portion at the fourth site to other transceivers that operate on a different coordinated microwave path on the first frequency is less than interference caused by the third site to the other transceivers.

9. A first base station comprising:

a transceiver portion at a first site having a side lobe portion configured to transmit to and receive from a transceiver portion of a second base station at a second site on a concurrently coordinated microwave path on a frequency pair with frequency division duplex-time division duplex (FDD-TDD), the transceiver portion of the first site further configured to transmit to and receive from a transceiver portion of a fourth site on a concurrently coordinated microwave path on the first frequency using time division multiplexing, the fourth site located in an optimized area defined by and including the union of a first coordination area of the first base station at the first site, the second coordination area of the second base station at the second site and a third coordination area of a third base station at a third site, the optimized area being subject to co-channel interference created by transmitting from the first base station to the second base station on a first coordinated microwave path and from the second base station to the first base station on a second coordinated microwave path using the frequency pair with frequency division duplex-time division duplex (FDD-TDD) and by transmitting from the third base station to the second base station on a third coordinated microwave path and from the second base station to the third base station using the frequency pair with frequency division duplex-time division duplex (FDD-TDD) as a result of which no foreign transceiver can operate on a different coordinated microwave path on a first frequency and a second frequency of the frequency pair in the optimized area without being subjected to or causing interference greater than a permissible level, where interference caused by the fourth site to other transceivers that operate on a different coordinated microwave path on the first frequency is less than interference caused by the third site to the other transceivers.