CA2583721A1 - Improved beacon signals facilitating signal detection and timing synchronization - Google Patents
Improved beacon signals facilitating signal detection and timing synchronization Download PDFInfo
- Publication number
- CA2583721A1 CA2583721A1 CA002583721A CA2583721A CA2583721A1 CA 2583721 A1 CA2583721 A1 CA 2583721A1 CA 002583721 A CA002583721 A CA 002583721A CA 2583721 A CA2583721 A CA 2583721A CA 2583721 A1 CA2583721 A1 CA 2583721A1
- Authority
- CA
- Canada
- Prior art keywords
- transmitter
- signal
- beacon signal
- time periods
- during
- 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.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
Abstract
Improved beacon signaling methods are described. Beacon signals are transmitted on the same tone in at least two consecutive symbol periods facilitating accurate energy measurements over a symbol period even if timing synchronization with the transmitter is not maintained. A low power wideband signal is also combined with the beacon signal to facilitate channel estimation and other operation such as timing synchronization operations.
Claims (60)
1. A communications method comprising:
operating a first transmitter in a first cell to transmit on a recurring schedule, for at least two consecutive symbol time periods, a narrowband beacon signal, said narrowband beacon signal including at least 60 percent of the power transmitted by said first transmitter during said two consecutive time periods.
operating a first transmitter in a first cell to transmit on a recurring schedule, for at least two consecutive symbol time periods, a narrowband beacon signal, said narrowband beacon signal including at least 60 percent of the power transmitted by said first transmitter during said two consecutive time periods.
2. The communication method of claim 1, further comprising:
periodically operating a second transmitter located adjacent said first transmitter, to transmit, for at least two consecutive symbol time periods, a narrowband beacon signal, said narrowband beacon signal including at least 60 percent of the power transmitted by said second transmitter during said two consecutive time periods.
periodically operating a second transmitter located adjacent said first transmitter, to transmit, for at least two consecutive symbol time periods, a narrowband beacon signal, said narrowband beacon signal including at least 60 percent of the power transmitted by said second transmitter during said two consecutive time periods.
3. The communication method of claim 2, wherein said first and second transmitters are located in adjacent cells of a communications system and wherein said first and second transmitters transmit beacon signals during different non-overlapping symbol time periods.
4. The communications method of claim 1, further comprising:
operating the first transmitter to transmit a wideband signal during at least one of said at least two consecutive symbol time periods, said wideband signal using less than 40 percent of the power transmitted by said first transmitter during said at least one of said at least two consecutive symbol time periods.
operating the first transmitter to transmit a wideband signal during at least one of said at least two consecutive symbol time periods, said wideband signal using less than 40 percent of the power transmitted by said first transmitter during said at least one of said at least two consecutive symbol time periods.
5. The method of claim 4, wherein the wideband signal has the same duration as said beacon signal.
6. The method of claim 5, wherein said beacon signal and said wideband signal occupy two consecutive symbol transmission time periods.
7. The method of claim 6, wherein said beacon signal uses a single physical tone which is the same for each of said at least two consecutive symbol transmission time periods.
8. The method of claim 7, wherein said wideband signal uses a plurality of physical tones, said plurality including the same physical tones during each of said at least two consecutive symbol transmission time periods.
9. The method of claim 7, wherein said wideband signal uses at least 30 percent of the tones used by said first transmitter to transit symbols in a symbol transmission time period immediately following said at least two consecutive symbol transmission time periods.
10. The method of claim 7, wherein at least 50 tones are used out of 113 tones for transmission of said wideband signal.
11. The communications method of claim 4, wherein said beacon signal uses at least 80% of the transmitter power during said at least two consecutive symbol time periods.
12. The communications method of claim 11, wherein said wideband signal uses 20% or less of the transmitter power during one of said at least two consecutive symbol time periods.
13. The communications method of claim 11, wherein the wideband signal is at least 5 times wider than the narrowband beacon signal in terms of frequency width.
14. The communications method of claim 11, where the wideband signal is at least 10 times wider than the narrowband beacon signal in terms of frequency width.
15. The communications method of claim 11, where the wideband signal is at least 20 times wider than the narrowband beacon signal in terms of frequency width.
16. The communications method of claim 12, wherein said beacon signal is less than 3 tones wide.
17. The communications method of claim 16, wherein said beacon signal is a single tone and wherein said transmitter transmits during each symbol time using at least 100 tones.
18. The communications method of claim 17, wherein said transmitter is an OFDM
transmitter and where a symbol time is the time used to transmit a single OFDM
symbol.
transmitter and where a symbol time is the time used to transmit a single OFDM
symbol.
19. The method of claim 2, wherein said first and second transmitters are transmitters corresponding to different sectors of a basestation located in a cell.
20. The method of claim 2, wherein said first and second transmitters are transmitters corresponding to different basestations located in adjacent cells.
21. The method of claim 2, further comprising:
operating a wireless terminal to receive beacon signals transmitted by said first and second base transmitters and to measure at least one beacon signal received from each of the transmitters to obtain for at least one beacon signal from each of the transmitters the energy received during a symbol time during which the beacon signal is received for the entire symbol time.
operating a wireless terminal to receive beacon signals transmitted by said first and second base transmitters and to measure at least one beacon signal received from each of the transmitters to obtain for at least one beacon signal from each of the transmitters the energy received during a symbol time during which the beacon signal is received for the entire symbol time.
22. The method of claim 21, further comprising:
operating the wireless terminal to compare the energy measured from the received first base station beacon signal during a symbol transmission time period in which the first base station beacon signal was received during the full symbol time in which energy was measured to the energy measured from the received second base station beacon signal during a symbol transmission time period in which the second base station beacon signal was received during the full symbol time in which energy was measured.
operating the wireless terminal to compare the energy measured from the received first base station beacon signal during a symbol transmission time period in which the first base station beacon signal was received during the full symbol time in which energy was measured to the energy measured from the received second base station beacon signal during a symbol transmission time period in which the second base station beacon signal was received during the full symbol time in which energy was measured.
23. The method of claim 22, further comprising:
making a selection of which transmitter the wireless terminal is to interact with based on the measured beacon signal energy.
making a selection of which transmitter the wireless terminal is to interact with based on the measured beacon signal energy.
24. The method of claim 22, further comprising:
operating the wireless terminal to make a timing signal adjustment based on a wideband signal received during the same symbol time period as a beacon signal.
operating the wireless terminal to make a timing signal adjustment based on a wideband signal received during the same symbol time period as a beacon signal.
25. The method of claim 25, wherein said timing signal adjustment is made after the wireless terminal determines that it should interact with a transmitter with which it does not already have timing synchronization, said wideband signal used to make said timing signal adjustment being from the transmitter which said wireless terminal is to interact.
26. The method of claim 24, wherein said wireless terminal uses said wideband signal for channel estimation.
27. The method of claim 26, wherein said wideband signal includes multiple tones spaced over a frequency band at least 15 tones wide.
28. A communications system comprising:
a first base station including:
a first transmitter for transmitting on a plurality of tones;
stored transmission schedule information; and a first transmitter control module for controlling said first transmitter to transmit on a recurring basis in accordance with said stored schedule information, for at least two consecutive symbol time periods, a narrowband beacon signal, said narrowband beacon signal including at least 60 percent of the power transmitted by said first transmitter during said two consecutive time periods.
a first base station including:
a first transmitter for transmitting on a plurality of tones;
stored transmission schedule information; and a first transmitter control module for controlling said first transmitter to transmit on a recurring basis in accordance with said stored schedule information, for at least two consecutive symbol time periods, a narrowband beacon signal, said narrowband beacon signal including at least 60 percent of the power transmitted by said first transmitter during said two consecutive time periods.
29. The system of claim 28, further comprising:
a second transmitter located adjacent said first transmitter for transmitting on said plurality of tones; and a second transmitter control module for controlling said second transmitter to transmit, for at least two consecutive symbol time periods, another narrowband beacon signal, said another narrowband beacon signal including at least 60 percent of the power transmitted by said second transmitter during said two consecutive time periods.
a second transmitter located adjacent said first transmitter for transmitting on said plurality of tones; and a second transmitter control module for controlling said second transmitter to transmit, for at least two consecutive symbol time periods, another narrowband beacon signal, said another narrowband beacon signal including at least 60 percent of the power transmitted by said second transmitter during said two consecutive time periods.
30. The system of claim 29, wherein said second transmitter is located in a second base station, said first and second transmitters being located in adjacent cells of a communications system.
31. The system of claim 28, wherein said first base station further comprises:
a wideband signal generating module for generating a wideband signal to be transmitted during at least one of said at least two consecutive symbol time periods, said wideband signal using less than 40 percent of the power transmitted by said first transmitter during said at least one of said at least two consecutive symbol time periods.
a wideband signal generating module for generating a wideband signal to be transmitted during at least one of said at least two consecutive symbol time periods, said wideband signal using less than 40 percent of the power transmitted by said first transmitter during said at least one of said at least two consecutive symbol time periods.
32. The system of claim 31, wherein the wideband beacon signal has the same duration as said beacon signal.
33. The system of claim 32, wherein said beacon signal and said wideband signal occupy two consecutive symbol transmission time periods.
34. The system of claim 33, wherein said beacon signal uses a single physical tone which is the same for each of said two consecutive symbol transmission time periods.
35. The system of claim 34, wherein said wideband signal uses a plurality of physical tones, said plurality including the same physical tones during each of said two consecutive symbol transmission time periods.
36. The system of claim 34, wherein said wideband signal uses at least 30 percent of the tones used by said first transmitter to transit symbols in a symbol transmission time period immediately following said two consecutive symbol transmission time periods.
37. The system of claim 34, wherein at least 50 tones are used out of 113 tones for transmission of said wideband signal.
38. The system of claim 31, wherein said control module includes a transmission power control module for controlling the transmitter to supply at least 80% of the transmitter transmission power used during said two consecutive symbol time periods to said beacon signal.
39. A method of operating a wireless terminal, comprising:
receiving beacon signals transmitted by first and second transmitters;
measuring the amount of received energy in a first beacon signal received from the first transmitter during a first measurement time interval in which the first beacon signal is received from the first transmitter for the full duration of said first measurement time interval to produce a first measured signal energy value; and measuring the amount of received energy in a second beacon signal received from the second transmitter during a second measurement time interval in which the second beacon signal is received from the second transmitter for the full duration of said second measurement time interval to produce a second measured signal energy value.
receiving beacon signals transmitted by first and second transmitters;
measuring the amount of received energy in a first beacon signal received from the first transmitter during a first measurement time interval in which the first beacon signal is received from the first transmitter for the full duration of said first measurement time interval to produce a first measured signal energy value; and measuring the amount of received energy in a second beacon signal received from the second transmitter during a second measurement time interval in which the second beacon signal is received from the second transmitter for the full duration of said second measurement time interval to produce a second measured signal energy value.
40. The method of claim 39, wherein said first and second measurement time intervals are different.
41. The method of claim 40, wherein said first and second measurement time intervals are non overlapping with each other.
42. The method of claim 39, further comprising:
comparing the first and second measured signal energy values.
comparing the first and second measured signal energy values.
43. The method of claim 42, further comprising:
making a selection between an attachment point corresponding to said first transmitter and an attachment point corresponding to said second transmitter based on the result of said comparison of the first and second measured signal energy values.
making a selection between an attachment point corresponding to said first transmitter and an attachment point corresponding to said second transmitter based on the result of said comparison of the first and second measured signal energy values.
44. The method of claim 42, further comprising:
making a transmitter timing signal adjustment based on a wideband signal received during the same symbol time period as a beacon signal.
making a transmitter timing signal adjustment based on a wideband signal received during the same symbol time period as a beacon signal.
45. The method of claim 44, wherein said transmitter timing signal adjustment is made after the wireless terminal determines that it should interact with an attachment point with which the wireless terminal does not already have timing synchronization.
46. The method of claim 44, further comprising:
performing a channel estimation operation based on said received wideband signal received with a beacon signal from a transmitter at an attachment point to which the terminal is seeking to attach.
performing a channel estimation operation based on said received wideband signal received with a beacon signal from a transmitter at an attachment point to which the terminal is seeking to attach.
47. The method of claim 46, wherein said wideband signal includes multiple tones spaced over a frequency band at least 15 tones wide.
48. A wireless terminal comprising:
a beacon signal measurement module; and a wideband signal evaluation module for processing said wideband synchronization signal to produce a timing adjustment control signal.
a beacon signal measurement module; and a wideband signal evaluation module for processing said wideband synchronization signal to produce a timing adjustment control signal.
49. The wireless terminal of claim 48, further comprising:
a channel estimation module for performing a channel estimate based on said received wideband signal and NULL tones included with said wideband signal.
a channel estimation module for performing a channel estimate based on said received wideband signal and NULL tones included with said wideband signal.
50. The wireless terminal of claim 49, further comprising:
a handoff control module for changing attachment points and adjusting transmitter timing using information supplied by said wideband signal evaluation module.
a handoff control module for changing attachment points and adjusting transmitter timing using information supplied by said wideband signal evaluation module.
51. The wireless terminal of claim 50, wherein said handoff control module uses said channel estimate based on said wideband signal to initialize another channel estimate that is to be used when attaching to the point from which the wideband signal used to generate said channel estimate was transmitted.
52. A communications method comprising:
operating a first transmitter in a first cell to transmit, during a first recurring beacon signal transmission time period a narrowband beacon signal, said narrowband beacon signal being transmitted in two consecutive symbol transmission time periods occurring within said first recurring beacon signal transmission time period, said narrowband beacon signal occupying a signal tone transmitted by said transmitter at a higher power level than any non-beacon signal tone transmitted during said at least two consecutive symbol transmission time periods.
operating a first transmitter in a first cell to transmit, during a first recurring beacon signal transmission time period a narrowband beacon signal, said narrowband beacon signal being transmitted in two consecutive symbol transmission time periods occurring within said first recurring beacon signal transmission time period, said narrowband beacon signal occupying a signal tone transmitted by said transmitter at a higher power level than any non-beacon signal tone transmitted during said at least two consecutive symbol transmission time periods.
53. The method of claim 52, further comprising:
operating the first transmitter to transmit signals for at least 50 symbol transmission time periods between each of said recurring first beacon signal transmission time periods without transmitting any signals with a per tone energy equal to or exceeding said at least one signal tone transmitted at said higher power level.
operating the first transmitter to transmit signals for at least 50 symbol transmission time periods between each of said recurring first beacon signal transmission time periods without transmitting any signals with a per tone energy equal to or exceeding said at least one signal tone transmitted at said higher power level.
54. The method of claim 53, wherein said narrowband beacon signal includes a single signal tone having said higher power level, the frequency of said tone being the same for the two consecutive symbol transmission time periods.
55. The method of claim 54, wherein said narrowband beacon signal corresponds to less than 2 percent of the downlink tones used by said first transmitter during and between at least one occurrence of said first recurring beacon signal transmission time period.
56. The method of claim 54, further comprising operating said first transmitter to transmit null values on more than 40 percent of the total number of downlink tones in a downlink tone block corresponding to said first transmitter and including the tone on which said single high power tone is transmitted.
57. The method of claim 54, further comprising operating said first transmitter to transmit null values on more than 50 percent of the total number of downlink tones in a downlink tone block corresponding to said first transmitter and including the tone on which said single high power tone is transmitted.
58. The method of claim 57, wherein the number of tones in said downlink tone block includes 113 tones.
59. The method of claim 57, further comprising operating said first transmitter to transmit a wideband synchronization signal during said consecutive symbol transmission time periods.
60. The method of claim 59, wherein said wideband synchronization signal includes at least 50 non-zero signal values, each non-zero signal value being transmitted on a different one tone in said downlink tone block.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US61872004P | 2004-10-14 | 2004-10-14 | |
| US60/618,720 | 2004-10-14 | ||
| PCT/US2005/037019 WO2006044661A2 (en) | 2004-10-14 | 2005-10-14 | Improved beacon signals facilitating signal detection and timing synchronization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2583721A1 true CA2583721A1 (en) | 2006-04-27 |
| CA2583721C CA2583721C (en) | 2010-03-30 |
Family
ID=36203557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2583721A Expired - Fee Related CA2583721C (en) | 2004-10-14 | 2005-10-14 | Improved beacon signals facilitating signal detection and timing synchronization |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1807953A2 (en) |
| JP (2) | JP2008517537A (en) |
| KR (1) | KR20070085357A (en) |
| CN (1) | CN101292452A (en) |
| CA (1) | CA2583721C (en) |
| WO (1) | WO2006044661A2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7801227B2 (en) * | 2006-04-14 | 2010-09-21 | Qualcomm Incorporated | Methods and apparatus related to composite beacon and wideband synchronization signaling |
| KR101120228B1 (en) * | 2006-06-16 | 2012-03-19 | 콸콤 인코포레이티드 | Multiplexing of information streams |
| US8665799B2 (en) * | 2006-09-14 | 2014-03-04 | Qualcomm Incorporated | Beacon assisted cell search in a wireless communication system |
| UA94482C2 (en) * | 2006-10-03 | 2011-05-10 | Квелкомм Інкорпорейтед | Synchronization transmission in a wireless communication system |
| US20090075664A1 (en) * | 2007-09-14 | 2009-03-19 | Qualcomm Incorporated | Multiplexed beacon symbols for a wireless communication system |
| JP5015103B2 (en) * | 2008-09-17 | 2012-08-29 | 株式会社エヌ・ティ・ティ・ドコモ | Communication system, communication terminal and method |
| US9240869B2 (en) | 2009-11-25 | 2016-01-19 | Sharp Kabushiki Kaisha | Wireless communication system |
| US20150382171A1 (en) * | 2013-02-07 | 2015-12-31 | Interdigital Patent Holdings, Inc. | Long-range device discovery with directional transmissions |
| US9496975B2 (en) * | 2014-09-19 | 2016-11-15 | Qualcomm Incorporated | Dynamic directional synchronization signals in wireless communications |
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| JPS648738A (en) * | 1987-07-01 | 1989-01-12 | Toshiba Corp | Radio communication system |
| JPS6451837A (en) * | 1987-08-24 | 1989-02-28 | Nec Corp | Small sized earth station |
| JPH07245574A (en) * | 1994-03-07 | 1995-09-19 | Nippon Hoso Kyokai <Nhk> | Digital signal transmission method |
| JPH10210002A (en) * | 1997-01-17 | 1998-08-07 | Victor Co Of Japan Ltd | Mobile communication system |
| JP3985299B2 (en) * | 1997-07-14 | 2007-10-03 | 三菱電機株式会社 | Mobile communication system |
| JP2000115834A (en) * | 1998-10-05 | 2000-04-21 | Sony Corp | Communication method, base station device and communication terminal |
| JP2000134174A (en) * | 1998-10-22 | 2000-05-12 | Victor Co Of Japan Ltd | Ofdm receiver |
| US6389087B1 (en) * | 1999-06-23 | 2002-05-14 | At&T Wireless Services, Inc. | Apparatus and method for synchronization in a multiple-carrier communication system by observing energy within a guard band |
| JP2001119744A (en) * | 1999-10-18 | 2001-04-27 | Advanced Space Communications Research Laboratory | Mobile communication method |
| JP2002152083A (en) * | 2000-11-08 | 2002-05-24 | Miyota Kk | Ss communication apparatus |
| JP2002223479A (en) * | 2001-01-29 | 2002-08-09 | Mitsubishi Materials Corp | Wireless data communication system, base station, mobile station and program |
| US6940827B2 (en) * | 2001-03-09 | 2005-09-06 | Adaptix, Inc. | Communication system using OFDM for one direction and DSSS for another direction |
| CN100409608C (en) * | 2001-03-09 | 2008-08-06 | 高通弗拉里奥恩技术公司 | Method of symbol timing synchronization in communication systems |
| US6912262B1 (en) * | 2001-04-30 | 2005-06-28 | Maxim Integrated Products, Inc. | Wideband symbol synchronization in the presence of multiple strong narrowband interference |
| JP3693025B2 (en) * | 2002-02-21 | 2005-09-07 | ソニー株式会社 | Wireless communication method, wireless communication system, wireless base station, wireless communication terminal, program, and medium |
| JP2003264870A (en) * | 2002-03-07 | 2003-09-19 | Sony Corp | Wireless communication system, mobile wireless communication apparatus and method, fixed wireless communication apparatus and method, recording medium, and program |
| JP3927447B2 (en) * | 2002-05-21 | 2007-06-06 | ソフトバンクテレコム株式会社 | Mobile communication system, transmitter and receiver |
| JP4095665B2 (en) * | 2002-12-27 | 2008-06-04 | ソフトバンクテレコム株式会社 | Channel assignment method |
| US7092353B2 (en) * | 2003-10-17 | 2006-08-15 | Qualcomm Incorporated | Carrier search methods and apparatus |
| JP2005333344A (en) * | 2004-05-19 | 2005-12-02 | Toshiba Corp | Wireless communication apparatus |
-
2005
- 2005-10-14 EP EP05824371A patent/EP1807953A2/en not_active Withdrawn
- 2005-10-14 KR KR1020077010911A patent/KR20070085357A/en not_active Application Discontinuation
- 2005-10-14 JP JP2007536940A patent/JP2008517537A/en active Pending
- 2005-10-14 CN CNA2005800428738A patent/CN101292452A/en active Pending
- 2005-10-14 CA CA2583721A patent/CA2583721C/en not_active Expired - Fee Related
- 2005-10-14 WO PCT/US2005/037019 patent/WO2006044661A2/en active Application Filing
-
2010
- 2010-06-07 JP JP2010129977A patent/JP2010268472A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP1807953A2 (en) | 2007-07-18 |
| JP2010268472A (en) | 2010-11-25 |
| WO2006044661A3 (en) | 2008-01-17 |
| KR20070085357A (en) | 2007-08-27 |
| CA2583721C (en) | 2010-03-30 |
| JP2008517537A (en) | 2008-05-22 |
| WO2006044661A2 (en) | 2006-04-27 |
| CN101292452A (en) | 2008-10-22 |
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