CA2562680A1 - Methods and apparatus for selecting between multiple carriers using a single receiver chain tuned to a single carrier - Google Patents

Methods and apparatus for selecting between multiple carriers using a single receiver chain tuned to a single carrier Download PDF

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Publication number
CA2562680A1
CA2562680A1 CA 2562680 CA2562680A CA2562680A1 CA 2562680 A1 CA2562680 A1 CA 2562680A1 CA 2562680 CA2562680 CA 2562680 CA 2562680 A CA2562680 A CA 2562680A CA 2562680 A1 CA2562680 A1 CA 2562680A1
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Canada
Prior art keywords
signal
frequency band
component
selecting
transmitter
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Granted
Application number
CA 2562680
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French (fr)
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CA2562680C (en
Inventor
Rajiv Laroia
Junyi Li
Frank A. Lane
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Qualcomm Inc
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Individual
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Publication of CA2562680C publication Critical patent/CA2562680C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/40—Monitoring; Testing of relay systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
    • H04B1/406—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H04B17/327—Received signal code power [RSCP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover

Abstract

Receivers accommodating carrier frequency selection methods in wireless communications systems employing multiple carrier frequencies are described.
Although the receiver is tuned to a single band, an estimate of the channel quality corresponding to the currently used carrier and an alternative carrier is generated without switching between carriers. Transmitters of different cells and/or different sectors primarily use different carrier frequencies but periodically transmit using a neighboring sector's carrier frequency. Mobile node receivers use a single RF chain with a controllable RF filter to receive and process a signal within a first selected carrier band including two components, a first signal component identified with the first currently selected band and a second signal component identified with a second alternative band. Separate quality indicator values are obtained from the first and second signal components, compared, and a determination is made as to whether the receiver's RF filter should be switched to the second band.

Claims (37)

1. A communications method, the method comprising:
receiving a signal including a first component and a second component;
operating a filter to pass said first and second signal components, said first and second signal components being within a first frequency band;
performing a first signal measurement on said first signal component to generate a first signal quality indicator;
performing a second signal measurement on said second signal component to generate a second signal quality indicator; and selecting between operating in the first frequency band and a second frequency band associated with said second signal component as a function of said first and second signal quality indicators.
2. The method of 1, wherein said second frequency band is outside said first frequency band.
3. The method of 2, wherein said receiving, performing and selecting steps are performed by a mobile communications device, the method further comprising:
operating a first transmitter which primarily transmits in the first frequency band to transmit said first signal component; and operating a second transmitter which primarily transmits in said second frequency band to transmit said second signal component in said first frequency band.
4. The method of 3, wherein said first transmitter and said second transmitter are located in different sectors of the same cell;
wherein the first signal component is transmitted using a first antenna corresponding to a first sector of said same cell; and wherein the second signal component is transmitted using a second antenna corresponding to a second sector of said same cell.
5. The method of 3, wherein said first transmitter and said second transmitter are located in different cells;
wherein the first signal component is transmitted using a first antenna corresponding to a first cell; and wherein the second signal component is transmitted using a second antenna corresponding to a second cell.
6. The method of 4, wherein said signal is received over a period of time; and wherein said first and second signal components are received at different points in time.
7. The method of 6, wherein said first and second signal components are narrow in frequency width compared to the width of said filter.
8. The method of 7, wherein said first and second signal components have a frequency width at most 1/20 the frequency width of said filter.
9. The method of 3, further comprising:
operating the first transmitter to periodically transmit a signal in the second frequency band.
10. The method of 3, wherein the first and second frequency bands are at least 1 MHz in width.
11. The method of 10, wherein said filter has a band less than 2 MHz in width.
12. The method of 1, further comprising:
when said second frequency band is selected, controlling said filter to pass said second band instead of said first band.
13. The method of 12, further comprising:
operating the filter to pass third and fourth signal components, said third and fourth signal components being within the second frequency band;

performing a third signal measurement on said third signal component to generate a third signal quality indicator;
performing a fourth signal measurement on said fourth signal component to generate a fourth signal quality indicator; and selecting between operating in the first frequency band and the second frequency band as a function of said third and fourth signal quality indicators.
14. The method of 13, further comprising:
when said first frequency band is selected, controlling said filter to pass said first frequency band instead of said second frequency band.
15. The method of 1, further comprising:
repeating said receiving step and first and second measurement steps multiple times, said selecting between said first and second frequency bands selecting the second frequency band after said second quality indicator exceeds said first quality indicator for a predetermined interval.
16. The method of 15, wherein said interval is a time interval of a predetermined duration.
17. The method of 15, wherein said predetermined interval includes a fixed number of signal measurements.
18. The method of 1, wherein said selecting is based on a predetermined threshold.
19. The method of 18, wherein said selecting includes selecting the frequency band corresponding to the lower signal quality value when said first and second signal quality values both exceed said predetermined threshold for a preselected interval.
20. The method of 18, wherein said selecting includes selecting the frequency band corresponding to the higher signal quality value when one of said first and second signal quality values is below said predetermined threshold.
21. The method of 1, wherein said selecting includes selecting the second frequency band when said first signal quality value decreases over time and said second signal quality value increases over time and a difference in the first and second quality values changes sign.
22. The method of 1, wherein said selecting step is a function of a quality of service (QoS) to be provided to a user, said selecting function changing in response to information indicating a change in the QoS to be provided to said user.
23. The method of 1, wherein said selecting step is a function of communication system loading, the method further comprising:
receiving information indicative of communications system loading; and modifying said selecting function in response to an indication in a change in communication system loading.
24. The method of 23, wherein said communication system loading information is communicated from a base station to a device receiving said signal from said base station.
25. A communications device, comprising:
a receiver antenna for receiving a signal including a first component and a second component;
a controllable filter coupled to said antenna for filtering said received signal and for passing signals in a selected one of a first frequency band and a second frequency band while discarding as least some frequencies included in the other one of said first and second frequency bands, said first and second signal components being within the selected one of the first and second frequency bands, the first signal component being associated with said first frequency band, said second signal component being associated with said second frequency band;
a first signal measurement device coupled to said controllable filter for performing a first signal measurement on said first signal component to generate a first signal quality indicator;
a second signal measurement device coupled to said controllable filter for performing a second signal measurement on said second signal component to generate a second signal quality indicator; and a frequency band selection module for selecting between operating in the first frequency band and a second frequency band as a function of said first and second signal quality indicators and for generating a control signal used to control the one of the first and second frequency bands which will be passed by said controllable filter.
26. The device of claim 25, wherein said second frequency band is outside said first frequency band.
27. The device of claim 25, wherein said controllable filter passes said second frequency band and discards at least a portion of said first frequency band when said second frequency band is selected.
28. The device of claim 27, wherein said controllable filter passes third and fourth signal components included within the second frequency band when said second frequency band is selected, the device further comprising:
means for performing a third signal measurement on said third signal component to generate a third signal quality indicator;
means for performing a fourth signal measurement on said fourth signal component to generate a fourth signal quality indicator; and means for selecting between operating in the first frequency band and the second frequency band as a function of said third and fourth signal quality indicators.
29. A communications system comprising:
a portable communications device including:
i) a receiver antenna for receiving a signal including a first component and a second component;
ii) a controllable filter coupled to said antenna for filtering said received signal and for passing signals in a selected one of a first frequency band and a second frequency band while discarding at least some frequencies included in the other one of said first and second frequency bands, said first and second signal components being within the selected one of the first and second frequency bands, the first signal component being associated with said first frequency band, said second signal component being associated with said second frequency band;

iii) a first signal measurement device coupled to said controllable filter for performing a first signal measurement on said first signal component to generate a first signal quality indicator;
iv) a second signal measurement device coupled to said controllable filter for performing a second signal measurement on said second signal component to generate a second signal quality indicator;
v) a frequency band selection module for selecting between operating in the first frequency band and a second frequency band as a function of said first and second signal quality indicators and for generating a control signal used to control the one of the first and second frequency bands which will be passed by said controllable filter; and a first base station, the base station being located in a communications cell, the base station including:
a first transmitter which primarily transmits in the first frequency band for transmitting said first signal component.
30. The system of claim 29, wherein said first base station further comprises:
a first transmit antenna directed towards a first sector of said cell for transmitting the first signal component;
a second transmitter which primarily transmits in said second frequency band for transmitting said second signal component in said first frequency band during a fraction of the time said second transmitter operates, said second transmitter corresponding to a different sector of said cell than a sector to which said first transmitter corresponds; and a second transmit antenna directed towards the second sector of said cell for transmitting the second signal component, the first and second sectors being located in different physical areas of said cell.
31. The system of claim 30, wherein said signal is received over a period of time; and wherein said first and second signal components are received at different points in time.
32. The system of claim 31, wherein said controllable filter is a passband filter and wherein said first and second signal components are narrow in frequency width compared to the width of said controllable filter, said first and second signal components having a width less than one half the passband width of said controllable filter.
33. The system of claim 32, wherein said first and second signal components have a frequency width at most 1/20 the frequency width of passband of said controllable filter.
34. The system of claim 29, further comprising:
a second base station located in a second cell, the second base station including a second transmitter, said first transmitter and said second transmitter being located in different cells;
said first cell including a first antenna for transmitting the first signal component; and the second cell including a second antenna for transmitting the second signal component.
35. The system of claim 29, further comprising:
means for controlling the first transmitter to periodically transmit a signal in the second frequency band.
36. The system of claim 34, wherein the first and second frequency bands are at least 1 MHz in width.
37. The system of claim 36, wherein said controllable filter has a passband less than 2 MHz in width.
CA 2562680 2004-04-15 2004-10-15 Methods and apparatus for selecting between multiple carriers using a single receiver chain tuned to a single carrier Expired - Fee Related CA2562680C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US56290004P 2004-04-15 2004-04-15
US60/562,900 2004-04-15
US10/872,674 US6990324B2 (en) 2004-04-15 2004-06-21 Methods and apparatus for selecting between multiple carriers using a single receiver chain tuned to a single carrier
US10/872,674 2004-06-21
PCT/US2004/034129 WO2005109701A1 (en) 2004-04-15 2004-10-15 Methods and apparatus for selecting between multiple carriers using a single receiver chain tuned to a single carrier

Publications (2)

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CA2562680A1 true CA2562680A1 (en) 2005-11-17
CA2562680C CA2562680C (en) 2010-04-13

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US (2) US6990324B2 (en)
EP (2) EP2254255B1 (en)
JP (3) JP2007533253A (en)
KR (1) KR100883527B1 (en)
CN (2) CN1998170B (en)
AU (2) AU2004319484C1 (en)
BR (1) BRPI0418747A (en)
CA (1) CA2562680C (en)
EG (1) EG24346A (en)
IL (1) IL178605A (en)
MX (1) MXPA06011856A (en)
NO (1) NO20065210L (en)
NZ (1) NZ550515A (en)
RU (2) RU2369006C2 (en)
WO (1) WO2005109701A1 (en)
ZA (1) ZA200608583B (en)

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