WO2001076106B1 - Method and apparatus for reducing co-channel interference in a frame-synchronized wireless communication system - Google Patents
Method and apparatus for reducing co-channel interference in a frame-synchronized wireless communication systemInfo
- Publication number
- WO2001076106B1 WO2001076106B1 PCT/US2001/010243 US0110243W WO0176106B1 WO 2001076106 B1 WO2001076106 B1 WO 2001076106B1 US 0110243 W US0110243 W US 0110243W WO 0176106 B1 WO0176106 B1 WO 0176106B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- channel interference
- reducing
- communication system
- base stations
- stations
- Prior art date
Links
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2662—Arrangements for Wireless System Synchronisation
- H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
- H04B7/2678—Time synchronisation
- H04B7/2687—Inter base stations synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/12—Fixed resource partitioning
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention is a method and apparatus for reducing co-channel interference. The present invention includes a powerful means for eliminating co-channel interference from base stations in a wireless communication system. The present co-channel interference reducing method and apparatus utilizes frame synchronization between selected time frames (e.g., odd and even time frames) to reduce co-channel interference. Advantageously, the present invention reduces co-channel interference and, thus, allows robust modulation schemes to operate even at worst case line-of-sight (LoS) interference scenarios of 100 %. The present invention can also use an uplink/downlink ratio formula improve system capacity (i.e., reduce co-channel interference) in ATDD systems. The present inventive method and apparatus can be used in any type of frame synchronized communication system.
Claims
1 . (Amended) A method of reducing co-channel interference in a frame-based broadband wireless communication system, wherein the communication system comprises a plurality of base stations and a plurality of terminal stations, w herein each terminal station is associated with at least one base station, and wherein each base station has an associated and corresponding cell, wherein each cell includes a plurality of associated and corresponding sectors, and wherein the plurality of base stations use frame-synchronized communication, and wherein the communication system comprises an uplink and a downlink, and wherein the uplink comprises an uplink signal divided into a plurality of time frames, and wherein each time frame has an associated and corresponding frame number, the method comprising the steps of:
(a) determining a set of terminal stations that may potentially interfere with a selected base station;
(b) determining a geographically diagonal subset of the set of terminal stations, wherein the diagonal subset communicates w ith a first set of associated and corresponding base stations that are approximately diagonal to the selected base station;
(c) determining a geographically non-diagonal subset of the set of terminal stations, wherein the non-diagonal subset communicates w ith a second set of associated and corresponding base stations that are not approximate]} diagonal to the selected base station;
(d) allocating a first set of time frames for the first set of base stations;
(e) allocating a second set of time frames for the second set of base stations:
(f) transmitting uplink information from terminal stations associated with the first set of base stations during the first set of time frames: and
(g) transmitting uplink information from terminal stations associated with the second set of base stations during the second set of time frames.
2. The method of reducing co-channel interference in a frame-based broadband wireless communication system of claim 1 , wherein the communication system is a half-duplex frequency-division duplexed (FDD) system.
3. The method of reducing co-channel interference in a frame-based broadband wireless communication system of claim 1 , wherein the communication system is a time-division duplexed (TDD) system.
4. The method of reducing co-channel interference in a frame-based broadband wireless communication system of claim 1 , wherein the first set of time frames comprises odd- numbered time frames.
5. The method of reducing co-channel interference in a frame-based broadband wireless communication system of claim 1 , wherein the second set of time frames comprises even- numbered time frames.
6. (New) The method of reducing co-channel interference as set forth in Claim 1 , wherein selected sectors of base stations use the same frequency with different polarizations.
7. (New) The method of reducing co-channel interference as set forth in Claim 6, further comprising simultaneously transmitting downlink information to terminal stations associated with the first set of base stations and to terminal stations associated with the second set of base stations.
8. (New) The method of reducing co-channel interference as set forth in Claim 1 , wherein the communication system comprises an Adaptive Time Division Duplexing (ATDD) communication system.
9. (New) The method of reducing co-channel interference as set forth in Claim 1 , wherein the step (a) of determining a set of terminal stations comprises the sub-steps of:
(i) determining an operating property set for a selected sector of the selected base station; and (ii) determining a set of terminal stations that comprise the operating property set of the selected sector.
10. (New) The method of reducing co-channel interference as set forth in Claim 9, wherein the operating property set comprises a polarization, a frequency and a base station antenna direction.
1 1. (New) The method of reducing co-channel interference as set forth in Claim 9, wherein the set of terminal stations includes terminal stations that are associated with sectors of at least one base station.
12. (New) The method of reducing co-channel interference as set forth in Claim 1, wherein the step (a) of determining a set of terminal stations comprises the sub-steps of:
(i) determining a polarization and a frequency of a communication signal and determining an antenna direction for a selected sector of the selected base station; and
(ii) determining a set of terminal stations that include polarizations and frequencies of the communication signal similar to those determined in sub- step (i) and that also include a similar antenna direction for the selected sector as that determined in sub-step (i).
13. (New) The method of reducing co-channel interference as set forth in Claim 1, wherein the communication system includes a communication re-use scheme having a frequency re-use
- 31 -
factor of 2, a 2-frequency set, 2 polarizations of the 2-frequency set and having a 4 sectors- per-cell configuration (New) The method of reducing co-channel interference as set forth in Claim 1, wherein the communication system includes a communication re-use scheme having a frequency re-use factor of 2, a 1 -frequency set with 2 polarizations and having a 4 sectors-per-cell configuration (New) The method of reducing co-channel interference as set forth in Claim 1 , wherein the communication system includes a communication re-use scheme using a frequency re-use factor of 2, a 3-frequency set with 2 polarizations and having a 6 sectors-per-cell configuration (New) The method of reducing co-channel interference as set forth in Claim 1 , wherein the communication system includes a communication re-use scheme using a frequency re-use factor of 3/2, a 4-frequency set with 2 polarizations and having a 6 sectors-per-cell configuration (New) An apparatus for reducing co-channel interterence in a frame-based broadband wireless communication system, wherein the communication svstem comprises a plurality of base stations and a plurality of terminal stations wherein each terminal station is associated with at least one base station, and wherein each base station has an associated and corresponding cell, wherein each cell includes a plurality of associated and corresponding sectors, and wherein the plurality of base stations use frame-synchronized communication, and wherein the communication system comprises an uplink and a downlink, and wherein the uplink comprises an uplink signal divided into a pluralitv of time frames, and wherein each time frame has an associated and corresponding frame number, comprising
(a) a set determining means for determining a set of terminal stations that may potentially interfere with a selected base station,
(b) a diagonal subset determining means for determining a geographically diagonal subset of the set of terminal stations, wherein the diagonal subset communicates with a first set of associated and corresponding base stations that are approximately diagonal to the selected base station,
(c) a non-diagonal subset determining means for determining a geographically non- diagonal subset of the set of terminal stations, wherein the non-diagonal subset communicates with a second set of associated and corresponding base stations that are not approximately diagonal to the selected base station.
(d) a first allocating means for allocating a first set of time frames for the first set of base stations,
- 32 -
(e) a second allocating means for allocating a second set of time frames for the second set of base stations.
(f) a first transmitting means for transmitting uplink information from terminal stations associated with the first set of base stations during the first set of time frames, and
(g) a second transmitting means for transmitting uplink information from terminal stations associated with the second set of base stations during the second set of time frames (New) A frame-based broadband wireless communication system for reducing co-channel interference, comprising
(a) a plurality of base stations for transmitting and receiving communication signals within a cell,
(b) a base station controller, operatively coupled to the plurality of base stations, for controlling the plurality of base stations,
(c) a general purpose computer, operatively connected to the base station controller, for (1) determining a set of terminal stations that may potentially interfere with a selected base station, (n) determining a geographically diagonal subset of the set of terminal stations, wherein the diagonal subset communicates with a first set of associated and corresponding base stations that are approximately diagonal to the selected base station, (in) determining a geographically non-diagonal subset of the set of terminal stations, wherein the non-diagonal subset communicates with a second set of associated and corresponding base stations that are not approximately diagonal to the selected base station, (IV) vallocating a first set of time frames for the first set of base stations, (v) allocating a second set of time frames for the second set of base stations, and
(d) a plurality of terminal stations, communicatively coupled to at least one of the plurality of base stations, for transmitting and receiving communication signals within the cell
- 33 -
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01928336A EP1269658B1 (en) | 2000-03-31 | 2001-03-30 | Method and apparatus for reducing co-channel interference in a frame-synchronized wireless communication system |
| AT01928336T ATE448609T1 (en) | 2000-03-31 | 2001-03-30 | METHOD AND APPARATUS FOR REDUCING CO-CHANNEL INTERFERENCE IN A FRAME SYNCHRONIZED RADIO COMMUNICATIONS SYSTEM |
| DE60140437T DE60140437D1 (en) | 2000-03-31 | 2001-03-30 | METHOD AND DEVICE FOR REDUCING SAME CHANNEL TROUBLESHOOTING IN A RADIO COMMUNICATION SYSTEM WITH FRAME SYNCHRONIZATION |
| BR0109727-0A BR0109727A (en) | 2000-03-31 | 2001-03-30 | Method for Reducing Co-Channel Interference in a Frame-Based Broadband Wireless Communication System |
| AU2001255207A AU2001255207A1 (en) | 2000-03-31 | 2001-03-30 | Method and apparatus for reducing co-channel interference in a frame-synchronized wireless communication system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/539,891 US6798534B1 (en) | 1999-04-05 | 2000-03-31 | Image processing device |
| US09/539,891 | 2000-03-31 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| WO2001076106A2 WO2001076106A2 (en) | 2001-10-11 |
| WO2001076106A3 WO2001076106A3 (en) | 2002-03-14 |
| WO2001076106B1 true WO2001076106B1 (en) | 2002-06-27 |
Family
ID=24153085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US2001/010243 WO2001076106A2 (en) | 2000-03-31 | 2001-03-30 | Method and apparatus for reducing co-channel interference in a frame-synchronized wireless communication system |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU2001255207A1 (en) |
| WO (1) | WO2001076106A2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002023793A2 (en) | 2000-09-14 | 2002-03-21 | Ensemble Communications, Inc. | A system and method for wireless communication in a frequency division duplexing region |
| US7177598B2 (en) | 2000-11-15 | 2007-02-13 | Wi-Lan, Inc. | Method and system for reducing channel interference in a frame-synchronized wireless communication system |
| CA2431050A1 (en) * | 2000-12-08 | 2002-06-13 | Harris Broadband Wireless Access, Inc. | System and method for inband signaling for sector synchronization in a wireless communication system |
| US8165591B2 (en) | 2002-04-03 | 2012-04-24 | Illinois Institute Of Technology | Process to allocate channels in a sectorized cellular network |
| US20120127970A1 (en) * | 2010-01-29 | 2012-05-24 | Anil Gupta | Wireless Network System And Method Configured To Mitigate Co-channel Interference |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5517503A (en) * | 1993-06-11 | 1996-05-14 | Motorola, Inc. | Apparatus for and method of temporary termination of a communication resource |
| US5594720A (en) * | 1993-11-24 | 1997-01-14 | Lucent Technologies Inc. | Multiple access cellular communication with dynamic slot allocation and reduced co-channel interferences |
| US6038455A (en) * | 1995-09-25 | 2000-03-14 | Cirrus Logic, Inc. | Reverse channel reuse scheme in a time shared cellular communication system |
| SE513233C2 (en) * | 1998-01-23 | 2000-08-07 | Ericsson Telefon Ab L M | TDMA-TDD / FDD Radio communication system and channel selection method and device for such a system |
| ATE228749T1 (en) * | 1998-02-02 | 2002-12-15 | Ericsson Inc | SECTORIZATION FOR AREA COVERAGE IN COMMUNICATION SYSTEM WITH TIME MULTIPLEX METHOD AND FREQUENCY TIME DUPLEX |
| US6334057B1 (en) * | 1998-06-30 | 2001-12-25 | Telefonaktiebolaget Lm Ericsson (Publ) | Channel allocation in a telecommunications system with asymmetric uplink and downlink traffic |
-
2001
- 2001-03-30 WO PCT/US2001/010243 patent/WO2001076106A2/en active Application Filing
- 2001-03-30 AU AU2001255207A patent/AU2001255207A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO2001076106A3 (en) | 2002-03-14 |
| WO2001076106A2 (en) | 2001-10-11 |
| AU2001255207A1 (en) | 2001-10-15 |
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