WO2005076903A2 - Method and apparatus for measuring channel quality using a smart antenna in a wireless transmit/receive unit - Google Patents
Method and apparatus for measuring channel quality using a smart antenna in a wireless transmit/receive unit Download PDFInfo
- Publication number
- WO2005076903A2 WO2005076903A2 PCT/US2005/003476 US2005003476W WO2005076903A2 WO 2005076903 A2 WO2005076903 A2 WO 2005076903A2 US 2005003476 W US2005003476 W US 2005003476W WO 2005076903 A2 WO2005076903 A2 WO 2005076903A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wtru
- dwell time
- active beam
- channel quality
- active
- Prior art date
Links
Classifications
-
- 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
Definitions
- Smart antenna technology has been developed to increase wireless communication system capacity. Smart antennas are currently used in base stations, access points, and WTRUs.
- One form of smart antenna technology is the use of multiple radiating elements in one or more antennas to generate a plurality of directional beams. With this form of smart antenna, use of the directional beam or beams with the best quality reduces the amount of transmit power needed, usually resulting in increased system capacity.
- WTRUs In mobile communication systems, WTRUs typically monitor quality, such as signal-to-interference ratio (SIR), of the cell(s) currently serving the WTRU as well as neighboring cells.
- SIR signal-to-interference ratio
- WTRUs employing smart antenna techniques which generate a plurality of beams the WTRUs would need to monitor the quality of the plurality of beams for all of these cells (or a subset of these cells).
- active beam refers to a beam that a
- the WTRU uses for its data transmission and reception, and the terminology “serving base station” refers to a base station currently communicating with the WTRU.
- the terminology “current beam” refers to the beam currently being formed by the element(s) of the antenna(s).
- the WTRU In order to measure quality (such as SIR) on channels that correspond to non-active beams, the WTRU must switch its current beam to the non-active beam and observe the channel for some time. This time period is referred to as "dwell time", T_DWELL. Once the dwell time expires, the WTRU switches the current beam back to the original active beam for normal communication with the serving base station(s).
- the WTRU in order to measure the signal quality on inactive beams on multiple base stations, switches its current beam to the inactive beams for each of those base stations for a period of time. For example, if a WTRU uses a smart antenna which is configured to generate three beams (a left beam, an omni-directional beam and a right beam), and if the right beam is an active beam and the WTRU has to measure SIRs to three base stations (BS-1, BS-2, and BS-3) using the left beam, the WTRU first switches the current beam from the right beam to the left beam for T_DWELL to measure the SIR to BS-1.
- the WTRU despreads the received signal using the ?known pilot (or other) signal transmitted from BS-1, and the despread values are used to estimate the SIR to BS-1.
- the WTRU again switches the current beam to the left beam for another T_DWELL, and receives signals and despreads the received signal using the ?known pilot (or other) signal transmitted from BS-2. The despread values are then used to estimate the SIR to BS-2.
- the WTRU has to switch the current beam to the left beam again for another dwell time. Therefore, in this example, the WTRU must stay on the left beam for 3*T_DWELL to measure the SIRs on the left beam for all three base stations.
- WTRU operates based on the assumption that the channel it sees corresponds to the active beam. In the foregoing example, data reception is interrupted for 3*T_DWELL. More generally, in accordance with the prior art, a WTRU must switch a beam for N*T_DWELL, to measure the SIR to N base stations on an inactive beam. Since data can be continuously transmitted to the WTRU, it is necessary to keep the dwell time as short as possible.
- the present invention is a method and apparatus for measuring a channel quality in WTRUs which are equipped with a subscriber based smart antenna.
- the WTRUs are equipped with a smart antenna so that the WTRU generates a plurality of directional beams, and, optionally, an omnidirectional beam.
- a dwell time is provided in a measurement period to switch the current beam from an active beam to a non-active beam.
- the active beam is one of the plurality of directional beams or, optionally, the omni-directional beam, for communication with one or more serving base station(s).
- the current beam is switched to a non-active beam at the initiation of the dwell time. Signals are received through the non-active beam, and samples of the received signals are generated. The samples are stored in a memory. The current beam may be switched back to the active beam or another non-active beam. Channel quality is measured using the stored samples, whereby the dwell time to measure the channel quality is minimized.
- Figure 1 is a diagram of a wireless communication system in accordance with the present invention.
- Figure 2 is a flow diagram of a process for measuring a channel quality using a smart antenna in a WTRU in accordance with the present invention.
- Figure 3 is a flow diagram of a process for measuring a channel quality using a smart antenna in a WTRU in accordance with another embodiment of the present invention.
- Figure 4 shows a timing relationship between a dwell time and a measurement period in accordance with the present invention.
- FIG. 5 is a block diagram of a WTRU in accordance with the present invention.
- WTRU includes but is not limited to a user equipment, a mobile station, a fixed or mobile subscriber unit, a pager, a wireless local area network (WLAN) client station, or any other type of device capable of operating in a wireless environment.
- base station includes but is not limited to a Node B, a site controller, an access point, or any other type of interfacing device in a wireless environment.
- FIG. 1 is a diagram of a wireless communication system 100 in accordance with the present invention.
- the wireless communication system 100 comprises a plurality of base stations 104a, 104b and WTRUs 102.
- a region in the wireless communication system 100 is divided into a plurality of cells and each cell is served by each base station 104a, 104b.
- a WTRU 102 is equipped with a smart antenna and generates a plurality of directional beams to communicate with a base station 104a, 104b.
- a WTRU generates three directional beams.
- the WTRU may generate any number of directional beams and may also generate and use an omni-directional beam.
- the WTRU 102 receives signals from a serving base station (such as base station 104a) and from a plurality of non-serving base stations (such as base station 104b), and continually monitors channel quality to the base stations 104a, 104b.
- a serving base station such as base station 104a
- non-serving base stations such as base station 104b
- Figure 1 illustrates only one serving base station as an example, not as a limitation and that there may be more than one serving base station, whereby the WTRU 102 may select or combine signals from the serving base stations (for example, perform soft combining of the signals from the active set base stations in a CD?MA system).
- the channel quality is evaluated in terms of SIR or other relevant parameters.
- the WTRU 102 switches the current beam between an active beam 106a and non-active beams 106b.
- the WTRU is currently communicating with a serving base station BS-0 104a using an active beam 106a.
- the WTRU 102 periodically switches the current beam to non-active beams 106b and measures a channel quality to base stations BS-0, BS-1, BS-2 and BS-3, respectively.
- the WTRU does not have to use all non- active beams 106b, but may choose only a portion of the non-active beams 106b.
- FIG. 2 is a flow diagram of a process 200 for measuring channel quality using a smart antenna in a WTRU 102 in accordance with the present invention.
- the process is typically initiated by a measurement triggering signal or event.
- it is determined whether it is time to start a dwell period (step 202).
- the decision whether it is time to start a dwell period may be hardware and/or software controlled.
- One example is making the decision based on the expiration of a timer that is initiated at the start of the measurement period and expires after a preprogrammed wait period (which could be zero, a fixed value, or a variable value such as a fixed value with random jitter).
- the measurement triggering signal is an external event that marks the beginning of a measurement period and starts the procedure 200.
- a measurement triggering signal may be any hardware or software event to indicate the start of a measurement period (for example: the change of voltage on a pin of an integrated circuit, the expiration of a timer, or a software process call to the process 200).
- the measurement triggering signal/event marks the beginning of a measurement period.
- the measurement triggering signal/event can occur periodically or not periodically, resulting in a measurement period that is fixed or variable. The simplest example is the periodic case; in this case a new measurement period is triggered immediately after a previous measurement period ends.
- step 202 If it is not time to start a dwell period (step 202), then the process
- step 200 waits at step 202 until it is time to start the dwell period. If it is time to start the dwell period, a dwell time is provided during the measurement period to measure a beam (step 204). Then, a non-active beam that has not yet been measured in the current measurement period is chosen for measurement (step 206) and the current beam is switched to that non-active beam (step 208).
- FIG. 4 shows a timing relationship between a dwell time and a measurement period in accordance with the present invention. More than one dwell time may be provided in one measurement period depending on processing capacity, which will be explained in detail hereinafter.
- the dwell time may start not only at the beginning of the measurement period, but may start from any place in the measurement period in accordance with the hardware and/or software that controls this decision (e.g., software parameters).
- the length of the dwell time is set to provide a sufficient time period for a WTRU 102 to collect enough samples to measure the channel quality of base stations with the desired accuracy.
- the place of the dwell time in a measurement period and the duration of the dwell time may be fixed or variable. Therefore, a different number, different duration, and different place of dwell time(s) may be provided in each measurement period.
- the WTRU 102 receives signals from serving and non-serving base stations 104a, 104b through the switched non-active beam 106b (step 210).
- the WTRU 102 may select particular serving and non-serving base stations based on predetermined criteria, instead of processing all signals from serving and non-serving base stations 104a, 104b.
- the received signals are sampled (step 212) and the samples are stored in a memory (step 214). Once the samples are generated, the WTRU 102 computes the channel quality for the serving base station(s) 104a and non-serving base stations 104b (step 216).
- the WTRU 102 may start to compute the channel quality simultaneously while samples are generated and stored.
- the WTRU 102 may start to compute the channel quality after all the samples are generated and stored.
- the samples do not have to be processed before the current beam is switched to another beam, but may be processed in parallel with other procedures (for example, when new samples are generated with another beam) when the processing power of the WTRU 102 is sufficient for these multiple parallel processes.
- step 2128 After samples are generated and stored, it is determined if there is another non-active beam 106b to be measured (step 218). All non-active beams 106b do not have to be measured; the beams to be measured can be a select set of non-active beams. If there are no more non-active beams to be measured, the current beam is switched back to the original active beam 106a (step 220) and the process terminates (step 222) until the next measurement trigger.
- step 224 a decision is made whether to spread out the dwell times. Spreading out the dwell times allows a gap between measurements on non-active beams. Whether a gap is desired could be a predetermined configuration decision or be based on external factors, such as signal quality. If a gap is desired, the process 200 switches back to the active beam (step 226) and then waits for the start of the next dwell period (step 202). If a gap is not desired (step 224), the process 200 gets the dwell time (step 204).
- the WTRU 102 receives signals from serving and non-serving base stations 104a, 104b through the switched non-active beam 106b (step 310).
- the WTRU 102 may select particular serving and non-serving base stations based on predetermined criteria, instead of processing all signals from serving and non-serving base stations 104a, 104b.
- the received signals are sampled (step 312) and the samples are stored in a memory (step 314).
- the generated samples may be processed simultaneously to generate channel quality estimates for one or more base stations while samples are generated and stored (step 316). The number of base stations for which channel quality estimates can be computed while the samples are being stored is dependent on the processing power available.
- step 318 It is then determined whether enough resources are available, without providing another dwell period in the current measurement period, to process the channel quality estimates for the current non-active beam for all the remaining base stations (for which these estimates are needed) that were not processed in step 316 (step 318). The determination is made based on the amount of resources available for estimating channel quality (for example, correlation resources in CD?MA2000), which drives how much processing can be done in parallel, and the number of non-active beams and the number of base stations for which channel quality estimates are needed in the measurement period. The goal is to maximize parallelism so the current beam can return to, and remain on, the active beam as much as possible to minimize performance degradation.
- step 320 If the resources are not sufficient, additional dwell time is needed and a decision is made whether to spread out the dwell times (step 320). Additional samples for the non-active beam may be collected during an added dwell time, which may be provided consecutively to the current dwell time or spread out during the same measurement period. Spreading out the dwell times allows a gap between measurements on non-active beams in which signals are received on the active beam. Whether a gap is desired could be a pre-determined configuration decision or be based on external factors, such as signal quality. If a gap is desired, the process 300 switches back to the active beam (step 322) and then waits for the start of the next dwell period (step 302). If a gap is not desired (step 320), the process 300 gets the dwell time (step 304).
- steps 320-322 the current beam is kept on the non-active beam and another dwell time is provided. During this added dwell time, the stored samples are processed to obtain the channel quality for additional base stations for the current non-active beam. After the dwell time, the process 300 returns to step 318 to again check if resources are sufficient for processing any remaining base stations without adding another dwell time.
- step 334 If there are sufficient resources to process the remaining base stations (step 318), it is determined if there is another non-active beam 106b to be measured (step 324). All non-active beams 106b do not have to be measured; the beams to be measured can be a select set of non-active beams. If there are no more non-active beams to be measured, the current beam is switched back to the original active beam 106a (step 326), the samples for the remaining base stations are processed (step 328), and the process terminates (step 330) until the next measurement trigger.
- step 324 If it is determined that there is another non-active beam 106b to be measured (step 324), then two steps occur in parallel. The first step is to continue to process the samples for the remaining base stations on the currently selected beam (step 332). Second, a decision is made whether to spread out the dwell times (step 320). If a gap is desired, the process 300 switches back to the active beam (step 322) and then waits for the start of the next dwell period (step 302). If a gap is not desired (step 320), the process 300 gets the dwell time (step 304).
- the samples do not have to be processed before the current beam is switched to another beam (active or inactive), but may be processed in parallel with other procedures (for example, when new samples are generated with another beam) when the processing power of the WTRU 102 is sufficient for these multiple parallel processes.
- K N-M base stations
- Additional processing capability may be provided (i.e., add hardware and/or microprocessor/DSP capability or the like) or additional dwell time may be provided to switch the current beam to non-active beams 106b for additional periods in which channel quality measurements can be made.
- additional processing capability could be added such that the channel quality of all base stations could be estimated in a single dwell time.
- additional dwell times could be added with no additional processing capability of the WTRU 102. The dwell time may be added consecutively or may be spread out over the single measurement period.
- FIG. 5 is a block diagram of a WTRU 102 in accordance with the present invention.
- the WTRU 102 comprises a smart antenna 502, a beam switching unit 504, a sampler 506, a memory 508, a measurement unit 510, and a controller 512.
- the smart antenna 502 is configured to generate a plurality of directional beams, and, optionally, an omni-directional beam. Each beam is used to receive signals transmitted by base stations.
- the beam switching unit 504 is for switching the current beam to one of the plurality of directional beams and between one of the directional beams and the omnidirectional beam (if an omni-directional beam exists).
- the sampler 506 receives the signals from the smart antenna 502 which is directed toward a particular direction and generates samples of the received signals.
- the samples are stored in the memory 508.
- the measurement unit 510 performs a physical measurement (also called an estimation) of a channel quality using the samples.
- the controller 512 controls the beam switching unit 504 such that the current beam is switched to a non-active beam at the start of a dwell time and switches back to the active beam for communication with a serving base station at the expiration of the dwell time or multiple dwell times, as needed.
- the dwell time is minimized * by performing the physical measurements while the samples are being collected and stored and while the current beam is switched back to the active beam or another non-active beam.
- the base stations that the WTRU has to measure SIR estimates for include the base stations in the candidate set and/or the base stations in the neighbor set and/or the base stations in the active set.
- the method of the invention is not limited to a two-dimensional beam switching, but also applicable to three-dimensional beam switching.
- the features and elements of the present invention are described in the preferred embodiments in particular combinations, each feature or element can be used alone without the other features and elements of the preferred embodiments or in various combinations with or without other features and elements of the present invention.
Abstract
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US54301204P | 2004-02-06 | 2004-02-06 | |
US60/543,012 | 2004-02-06 | ||
US11/026,296 | 2004-12-30 | ||
US11/026,296 US7274936B2 (en) | 2004-02-06 | 2004-12-30 | Method and apparatus for measuring channel quality using a smart antenna in a wireless transmit/receive unit |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005076903A2 true WO2005076903A2 (en) | 2005-08-25 |
WO2005076903A3 WO2005076903A3 (en) | 2006-11-09 |
Family
ID=34840402
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2005/003476 WO2005076903A2 (en) | 2004-02-06 | 2005-01-28 | Method and apparatus for measuring channel quality using a smart antenna in a wireless transmit/receive unit |
Country Status (3)
Country | Link |
---|---|
US (2) | US7274936B2 (en) |
TW (2) | TWI261982B (en) |
WO (1) | WO2005076903A2 (en) |
Families Citing this family (166)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7340254B2 (en) * | 2004-02-05 | 2008-03-04 | Interdigital Technology Corporation | Measurement opportunities for a mobile unit operating with a switched beam antenna in a CDMA system |
JP4039389B2 (en) * | 2004-04-28 | 2008-01-30 | 船井電機株式会社 | Digital television broadcast signal receiver |
JP4501522B2 (en) * | 2004-04-28 | 2010-07-14 | 船井電機株式会社 | Digital television broadcast signal receiver |
US20060203784A1 (en) * | 2005-03-14 | 2006-09-14 | International Business Machines Corporation | Smart roaming to avoid time-outs during WLAN association |
US7420944B2 (en) * | 2005-10-14 | 2008-09-02 | The Boeing Company | Method of forming directional wireless networks using in-band channels |
CN101427479B (en) * | 2006-04-27 | 2014-08-20 | 艾利森电话股份有限公司 | Power control in a wireless system having multiple interfering communication resources |
US8041313B2 (en) * | 2008-04-04 | 2011-10-18 | Futurewei Technologies, Inc. | System and method for wireless communications |
US8520537B2 (en) * | 2008-08-08 | 2013-08-27 | Futurewei Technologies, Inc. | System and method for synchronized and coordinated beam switching and scheduling in a wireless communications system |
US8315657B2 (en) * | 2008-09-22 | 2012-11-20 | Futurewei Technologies, Inc. | System and method for enabling coordinated beam switching and scheduling |
US8670717B2 (en) * | 2008-11-27 | 2014-03-11 | Futurewei Technologies, Inc. | System and method for enabling coordinated beam switching and scheduling |
US8396006B2 (en) * | 2009-01-13 | 2013-03-12 | Futurewei Technologies, Inc. | System and method for enabling wireless communications with cell coordination |
US8396035B2 (en) * | 2009-04-24 | 2013-03-12 | Futurewei Technologies, Inc. | System and method for communications using time-frequency space enabled coordinated beam switching |
WO2010127026A1 (en) * | 2009-04-28 | 2010-11-04 | Futurewei Technologies, Inc. | System and method for coordinating electronic devices in a wireless communications system |
JPWO2011052775A1 (en) * | 2009-11-02 | 2013-03-21 | シャープ株式会社 | Mobile communication system, mobile station apparatus, and reconnection method |
CN103533558B (en) * | 2010-02-03 | 2017-06-27 | 华为技术有限公司 | Method, the apparatus and system of carrier wave polymerization cell measurement |
CN102143505B (en) * | 2010-02-03 | 2013-10-02 | 华为技术有限公司 | Method, device and system for measuring carrier wave polymerization cell |
US20130331081A1 (en) * | 2011-02-25 | 2013-12-12 | Telefonaktiebolaget L M Ericsson (Publ) | Method and Arrangement for Reducing Power Consumption in a Communication Device |
US9113347B2 (en) | 2012-12-05 | 2015-08-18 | At&T Intellectual Property I, Lp | Backhaul link for distributed antenna system |
US10009065B2 (en) | 2012-12-05 | 2018-06-26 | At&T Intellectual Property I, L.P. | Backhaul link for distributed antenna system |
KR101994325B1 (en) * | 2013-05-31 | 2019-09-30 | 삼성전자주식회사 | Array antenna apparatus and control method thereof in communication system |
US9999038B2 (en) | 2013-05-31 | 2018-06-12 | At&T Intellectual Property I, L.P. | Remote distributed antenna system |
US9525524B2 (en) | 2013-05-31 | 2016-12-20 | At&T Intellectual Property I, L.P. | Remote distributed antenna system |
US8897697B1 (en) | 2013-11-06 | 2014-11-25 | At&T Intellectual Property I, Lp | Millimeter-wave surface-wave communications |
US9692101B2 (en) | 2014-08-26 | 2017-06-27 | At&T Intellectual Property I, L.P. | Guided wave couplers for coupling electromagnetic waves between a waveguide surface and a surface of a wire |
US9768833B2 (en) | 2014-09-15 | 2017-09-19 | At&T Intellectual Property I, L.P. | Method and apparatus for sensing a condition in a transmission medium of electromagnetic waves |
US10063280B2 (en) | 2014-09-17 | 2018-08-28 | At&T Intellectual Property I, L.P. | Monitoring and mitigating conditions in a communication network |
US9615269B2 (en) | 2014-10-02 | 2017-04-04 | At&T Intellectual Property I, L.P. | Method and apparatus that provides fault tolerance in a communication network |
US9685992B2 (en) | 2014-10-03 | 2017-06-20 | At&T Intellectual Property I, L.P. | Circuit panel network and methods thereof |
US9503189B2 (en) | 2014-10-10 | 2016-11-22 | At&T Intellectual Property I, L.P. | Method and apparatus for arranging communication sessions in a communication system |
US9973299B2 (en) | 2014-10-14 | 2018-05-15 | At&T Intellectual Property I, L.P. | Method and apparatus for adjusting a mode of communication in a communication network |
US9762289B2 (en) | 2014-10-14 | 2017-09-12 | At&T Intellectual Property I, L.P. | Method and apparatus for transmitting or receiving signals in a transportation system |
US9653770B2 (en) | 2014-10-21 | 2017-05-16 | At&T Intellectual Property I, L.P. | Guided wave coupler, coupling module and methods for use therewith |
US9769020B2 (en) | 2014-10-21 | 2017-09-19 | At&T Intellectual Property I, L.P. | Method and apparatus for responding to events affecting communications in a communication network |
US9520945B2 (en) | 2014-10-21 | 2016-12-13 | At&T Intellectual Property I, L.P. | Apparatus for providing communication services and methods thereof |
US9627768B2 (en) | 2014-10-21 | 2017-04-18 | At&T Intellectual Property I, L.P. | Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith |
US9577306B2 (en) | 2014-10-21 | 2017-02-21 | At&T Intellectual Property I, L.P. | Guided-wave transmission device and methods for use therewith |
US9780834B2 (en) | 2014-10-21 | 2017-10-03 | At&T Intellectual Property I, L.P. | Method and apparatus for transmitting electromagnetic waves |
US9312919B1 (en) | 2014-10-21 | 2016-04-12 | At&T Intellectual Property I, Lp | Transmission device with impairment compensation and methods for use therewith |
US9800327B2 (en) | 2014-11-20 | 2017-10-24 | At&T Intellectual Property I, L.P. | Apparatus for controlling operations of a communication device and methods thereof |
US9742462B2 (en) | 2014-12-04 | 2017-08-22 | At&T Intellectual Property I, L.P. | Transmission medium and communication interfaces and methods for use therewith |
US9997819B2 (en) | 2015-06-09 | 2018-06-12 | At&T Intellectual Property I, L.P. | Transmission medium and method for facilitating propagation of electromagnetic waves via a core |
US9461706B1 (en) | 2015-07-31 | 2016-10-04 | At&T Intellectual Property I, Lp | Method and apparatus for exchanging communication signals |
US9544006B2 (en) | 2014-11-20 | 2017-01-10 | At&T Intellectual Property I, L.P. | Transmission device with mode division multiplexing and methods for use therewith |
US9954287B2 (en) | 2014-11-20 | 2018-04-24 | At&T Intellectual Property I, L.P. | Apparatus for converting wireless signals and electromagnetic waves and methods thereof |
US10243784B2 (en) | 2014-11-20 | 2019-03-26 | At&T Intellectual Property I, L.P. | System for generating topology information and methods thereof |
US10009067B2 (en) | 2014-12-04 | 2018-06-26 | At&T Intellectual Property I, L.P. | Method and apparatus for configuring a communication interface |
US10340573B2 (en) | 2016-10-26 | 2019-07-02 | At&T Intellectual Property I, L.P. | Launcher with cylindrical coupling device and methods for use therewith |
US10144036B2 (en) | 2015-01-30 | 2018-12-04 | At&T Intellectual Property I, L.P. | Method and apparatus for mitigating interference affecting a propagation of electromagnetic waves guided by a transmission medium |
US9876570B2 (en) | 2015-02-20 | 2018-01-23 | At&T Intellectual Property I, Lp | Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith |
US9749013B2 (en) | 2015-03-17 | 2017-08-29 | At&T Intellectual Property I, L.P. | Method and apparatus for reducing attenuation of electromagnetic waves guided by a transmission medium |
US9705561B2 (en) | 2015-04-24 | 2017-07-11 | At&T Intellectual Property I, L.P. | Directional coupling device and methods for use therewith |
US10224981B2 (en) | 2015-04-24 | 2019-03-05 | At&T Intellectual Property I, Lp | Passive electrical coupling device and methods for use therewith |
US9948354B2 (en) | 2015-04-28 | 2018-04-17 | At&T Intellectual Property I, L.P. | Magnetic coupling device with reflective plate and methods for use therewith |
US9793954B2 (en) | 2015-04-28 | 2017-10-17 | At&T Intellectual Property I, L.P. | Magnetic coupling device and methods for use therewith |
US9490869B1 (en) | 2015-05-14 | 2016-11-08 | At&T Intellectual Property I, L.P. | Transmission medium having multiple cores and methods for use therewith |
US9748626B2 (en) | 2015-05-14 | 2017-08-29 | At&T Intellectual Property I, L.P. | Plurality of cables having different cross-sectional shapes which are bundled together to form a transmission medium |
US9871282B2 (en) | 2015-05-14 | 2018-01-16 | At&T Intellectual Property I, L.P. | At least one transmission medium having a dielectric surface that is covered at least in part by a second dielectric |
US10650940B2 (en) | 2015-05-15 | 2020-05-12 | At&T Intellectual Property I, L.P. | Transmission medium having a conductive material and methods for use therewith |
US9917341B2 (en) | 2015-05-27 | 2018-03-13 | At&T Intellectual Property I, L.P. | Apparatus and method for launching electromagnetic waves and for modifying radial dimensions of the propagating electromagnetic waves |
US10103801B2 (en) | 2015-06-03 | 2018-10-16 | At&T Intellectual Property I, L.P. | Host node device and methods for use therewith |
US9866309B2 (en) | 2015-06-03 | 2018-01-09 | At&T Intellectual Property I, Lp | Host node device and methods for use therewith |
US9912381B2 (en) | 2015-06-03 | 2018-03-06 | At&T Intellectual Property I, Lp | Network termination and methods for use therewith |
US10812174B2 (en) | 2015-06-03 | 2020-10-20 | At&T Intellectual Property I, L.P. | Client node device and methods for use therewith |
US9913139B2 (en) | 2015-06-09 | 2018-03-06 | At&T Intellectual Property I, L.P. | Signal fingerprinting for authentication of communicating devices |
US9608692B2 (en) | 2015-06-11 | 2017-03-28 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
US10142086B2 (en) | 2015-06-11 | 2018-11-27 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
US9820146B2 (en) | 2015-06-12 | 2017-11-14 | At&T Intellectual Property I, L.P. | Method and apparatus for authentication and identity management of communicating devices |
US9667317B2 (en) | 2015-06-15 | 2017-05-30 | At&T Intellectual Property I, L.P. | Method and apparatus for providing security using network traffic adjustments |
US9640850B2 (en) | 2015-06-25 | 2017-05-02 | At&T Intellectual Property I, L.P. | Methods and apparatus for inducing a non-fundamental wave mode on a transmission medium |
US9865911B2 (en) | 2015-06-25 | 2018-01-09 | At&T Intellectual Property I, L.P. | Waveguide system for slot radiating first electromagnetic waves that are combined into a non-fundamental wave mode second electromagnetic wave on a transmission medium |
US9509415B1 (en) | 2015-06-25 | 2016-11-29 | At&T Intellectual Property I, L.P. | Methods and apparatus for inducing a fundamental wave mode on a transmission medium |
US10320586B2 (en) | 2015-07-14 | 2019-06-11 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating non-interfering electromagnetic waves on an insulated transmission medium |
US9853342B2 (en) | 2015-07-14 | 2017-12-26 | At&T Intellectual Property I, L.P. | Dielectric transmission medium connector and methods for use therewith |
US9882257B2 (en) | 2015-07-14 | 2018-01-30 | At&T Intellectual Property I, L.P. | Method and apparatus for launching a wave mode that mitigates interference |
US9722318B2 (en) | 2015-07-14 | 2017-08-01 | At&T Intellectual Property I, L.P. | Method and apparatus for coupling an antenna to a device |
US10044409B2 (en) | 2015-07-14 | 2018-08-07 | At&T Intellectual Property I, L.P. | Transmission medium and methods for use therewith |
US10205655B2 (en) | 2015-07-14 | 2019-02-12 | At&T Intellectual Property I, L.P. | Apparatus and methods for communicating utilizing an antenna array and multiple communication paths |
US9847566B2 (en) | 2015-07-14 | 2017-12-19 | At&T Intellectual Property I, L.P. | Method and apparatus for adjusting a field of a signal to mitigate interference |
US10148016B2 (en) | 2015-07-14 | 2018-12-04 | At&T Intellectual Property I, L.P. | Apparatus and methods for communicating utilizing an antenna array |
US10341142B2 (en) | 2015-07-14 | 2019-07-02 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating non-interfering electromagnetic waves on an uninsulated conductor |
US10033108B2 (en) | 2015-07-14 | 2018-07-24 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating an electromagnetic wave having a wave mode that mitigates interference |
US10170840B2 (en) | 2015-07-14 | 2019-01-01 | At&T Intellectual Property I, L.P. | Apparatus and methods for sending or receiving electromagnetic signals |
US9628116B2 (en) | 2015-07-14 | 2017-04-18 | At&T Intellectual Property I, L.P. | Apparatus and methods for transmitting wireless signals |
US10033107B2 (en) | 2015-07-14 | 2018-07-24 | At&T Intellectual Property I, L.P. | Method and apparatus for coupling an antenna to a device |
US9608740B2 (en) | 2015-07-15 | 2017-03-28 | At&T Intellectual Property I, L.P. | Method and apparatus for launching a wave mode that mitigates interference |
US9793951B2 (en) | 2015-07-15 | 2017-10-17 | At&T Intellectual Property I, L.P. | Method and apparatus for launching a wave mode that mitigates interference |
US10090606B2 (en) | 2015-07-15 | 2018-10-02 | At&T Intellectual Property I, L.P. | Antenna system with dielectric array and methods for use therewith |
US9912027B2 (en) | 2015-07-23 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for exchanging communication signals |
US9871283B2 (en) | 2015-07-23 | 2018-01-16 | At&T Intellectual Property I, Lp | Transmission medium having a dielectric core comprised of plural members connected by a ball and socket configuration |
US9948333B2 (en) | 2015-07-23 | 2018-04-17 | At&T Intellectual Property I, L.P. | Method and apparatus for wireless communications to mitigate interference |
US9749053B2 (en) | 2015-07-23 | 2017-08-29 | At&T Intellectual Property I, L.P. | Node device, repeater and methods for use therewith |
US9735833B2 (en) | 2015-07-31 | 2017-08-15 | At&T Intellectual Property I, L.P. | Method and apparatus for communications management in a neighborhood network |
US9967173B2 (en) | 2015-07-31 | 2018-05-08 | At&T Intellectual Property I, L.P. | Method and apparatus for authentication and identity management of communicating devices |
US9904535B2 (en) | 2015-09-14 | 2018-02-27 | At&T Intellectual Property I, L.P. | Method and apparatus for distributing software |
US10136434B2 (en) | 2015-09-16 | 2018-11-20 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having an ultra-wideband control channel |
US10079661B2 (en) | 2015-09-16 | 2018-09-18 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having a clock reference |
US10009063B2 (en) | 2015-09-16 | 2018-06-26 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having an out-of-band reference signal |
US9769128B2 (en) | 2015-09-28 | 2017-09-19 | At&T Intellectual Property I, L.P. | Method and apparatus for encryption of communications over a network |
US9729197B2 (en) | 2015-10-01 | 2017-08-08 | At&T Intellectual Property I, L.P. | Method and apparatus for communicating network management traffic over a network |
US9876264B2 (en) | 2015-10-02 | 2018-01-23 | At&T Intellectual Property I, Lp | Communication system, guided wave switch and methods for use therewith |
US10355367B2 (en) | 2015-10-16 | 2019-07-16 | At&T Intellectual Property I, L.P. | Antenna structure for exchanging wireless signals |
US10665942B2 (en) | 2015-10-16 | 2020-05-26 | At&T Intellectual Property I, L.P. | Method and apparatus for adjusting wireless communications |
US10359497B1 (en) * | 2016-04-07 | 2019-07-23 | Sprint Communications Company L.P. | Directional antenna orientation optimization |
US9912419B1 (en) | 2016-08-24 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for managing a fault in a distributed antenna system |
US9860075B1 (en) | 2016-08-26 | 2018-01-02 | At&T Intellectual Property I, L.P. | Method and communication node for broadband distribution |
US10291311B2 (en) | 2016-09-09 | 2019-05-14 | At&T Intellectual Property I, L.P. | Method and apparatus for mitigating a fault in a distributed antenna system |
US11032819B2 (en) | 2016-09-15 | 2021-06-08 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having a control channel reference signal |
US10135147B2 (en) | 2016-10-18 | 2018-11-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching guided waves via an antenna |
US10135146B2 (en) | 2016-10-18 | 2018-11-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching guided waves via circuits |
US10340600B2 (en) | 2016-10-18 | 2019-07-02 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching guided waves via plural waveguide systems |
US9991580B2 (en) | 2016-10-21 | 2018-06-05 | At&T Intellectual Property I, L.P. | Launcher and coupling system for guided wave mode cancellation |
US10374316B2 (en) | 2016-10-21 | 2019-08-06 | At&T Intellectual Property I, L.P. | System and dielectric antenna with non-uniform dielectric |
US9876605B1 (en) | 2016-10-21 | 2018-01-23 | At&T Intellectual Property I, L.P. | Launcher and coupling system to support desired guided wave mode |
US10811767B2 (en) | 2016-10-21 | 2020-10-20 | At&T Intellectual Property I, L.P. | System and dielectric antenna with convex dielectric radome |
US10312567B2 (en) | 2016-10-26 | 2019-06-04 | At&T Intellectual Property I, L.P. | Launcher with planar strip antenna and methods for use therewith |
US10498044B2 (en) | 2016-11-03 | 2019-12-03 | At&T Intellectual Property I, L.P. | Apparatus for configuring a surface of an antenna |
US10224634B2 (en) | 2016-11-03 | 2019-03-05 | At&T Intellectual Property I, L.P. | Methods and apparatus for adjusting an operational characteristic of an antenna |
US10225025B2 (en) | 2016-11-03 | 2019-03-05 | At&T Intellectual Property I, L.P. | Method and apparatus for detecting a fault in a communication system |
US10291334B2 (en) | 2016-11-03 | 2019-05-14 | At&T Intellectual Property I, L.P. | System for detecting a fault in a communication system |
US10535928B2 (en) | 2016-11-23 | 2020-01-14 | At&T Intellectual Property I, L.P. | Antenna system and methods for use therewith |
US10340601B2 (en) | 2016-11-23 | 2019-07-02 | At&T Intellectual Property I, L.P. | Multi-antenna system and methods for use therewith |
US10090594B2 (en) | 2016-11-23 | 2018-10-02 | At&T Intellectual Property I, L.P. | Antenna system having structural configurations for assembly |
US10178445B2 (en) | 2016-11-23 | 2019-01-08 | At&T Intellectual Property I, L.P. | Methods, devices, and systems for load balancing between a plurality of waveguides |
US10340603B2 (en) | 2016-11-23 | 2019-07-02 | At&T Intellectual Property I, L.P. | Antenna system having shielded structural configurations for assembly |
US10305190B2 (en) | 2016-12-01 | 2019-05-28 | At&T Intellectual Property I, L.P. | Reflecting dielectric antenna system and methods for use therewith |
US10361489B2 (en) | 2016-12-01 | 2019-07-23 | At&T Intellectual Property I, L.P. | Dielectric dish antenna system and methods for use therewith |
US10755542B2 (en) | 2016-12-06 | 2020-08-25 | At&T Intellectual Property I, L.P. | Method and apparatus for surveillance via guided wave communication |
US10382976B2 (en) | 2016-12-06 | 2019-08-13 | At&T Intellectual Property I, L.P. | Method and apparatus for managing wireless communications based on communication paths and network device positions |
US10020844B2 (en) | 2016-12-06 | 2018-07-10 | T&T Intellectual Property I, L.P. | Method and apparatus for broadcast communication via guided waves |
US10819035B2 (en) | 2016-12-06 | 2020-10-27 | At&T Intellectual Property I, L.P. | Launcher with helical antenna and methods for use therewith |
US10326494B2 (en) | 2016-12-06 | 2019-06-18 | At&T Intellectual Property I, L.P. | Apparatus for measurement de-embedding and methods for use therewith |
US10135145B2 (en) | 2016-12-06 | 2018-11-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating an electromagnetic wave along a transmission medium |
US10694379B2 (en) | 2016-12-06 | 2020-06-23 | At&T Intellectual Property I, L.P. | Waveguide system with device-based authentication and methods for use therewith |
US10637149B2 (en) | 2016-12-06 | 2020-04-28 | At&T Intellectual Property I, L.P. | Injection molded dielectric antenna and methods for use therewith |
US10439675B2 (en) | 2016-12-06 | 2019-10-08 | At&T Intellectual Property I, L.P. | Method and apparatus for repeating guided wave communication signals |
US9927517B1 (en) | 2016-12-06 | 2018-03-27 | At&T Intellectual Property I, L.P. | Apparatus and methods for sensing rainfall |
US10727599B2 (en) | 2016-12-06 | 2020-07-28 | At&T Intellectual Property I, L.P. | Launcher with slot antenna and methods for use therewith |
US10139820B2 (en) | 2016-12-07 | 2018-11-27 | At&T Intellectual Property I, L.P. | Method and apparatus for deploying equipment of a communication system |
US10027397B2 (en) | 2016-12-07 | 2018-07-17 | At&T Intellectual Property I, L.P. | Distributed antenna system and methods for use therewith |
US9893795B1 (en) | 2016-12-07 | 2018-02-13 | At&T Intellectual Property I, Lp | Method and repeater for broadband distribution |
US10168695B2 (en) | 2016-12-07 | 2019-01-01 | At&T Intellectual Property I, L.P. | Method and apparatus for controlling an unmanned aircraft |
US10243270B2 (en) | 2016-12-07 | 2019-03-26 | At&T Intellectual Property I, L.P. | Beam adaptive multi-feed dielectric antenna system and methods for use therewith |
US10359749B2 (en) | 2016-12-07 | 2019-07-23 | At&T Intellectual Property I, L.P. | Method and apparatus for utilities management via guided wave communication |
US10446936B2 (en) | 2016-12-07 | 2019-10-15 | At&T Intellectual Property I, L.P. | Multi-feed dielectric antenna system and methods for use therewith |
US10389029B2 (en) | 2016-12-07 | 2019-08-20 | At&T Intellectual Property I, L.P. | Multi-feed dielectric antenna system with core selection and methods for use therewith |
US10547348B2 (en) | 2016-12-07 | 2020-01-28 | At&T Intellectual Property I, L.P. | Method and apparatus for switching transmission mediums in a communication system |
US9911020B1 (en) | 2016-12-08 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for tracking via a radio frequency identification device |
US10103422B2 (en) | 2016-12-08 | 2018-10-16 | At&T Intellectual Property I, L.P. | Method and apparatus for mounting network devices |
US10411356B2 (en) | 2016-12-08 | 2019-09-10 | At&T Intellectual Property I, L.P. | Apparatus and methods for selectively targeting communication devices with an antenna array |
US10389037B2 (en) | 2016-12-08 | 2019-08-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for selecting sections of an antenna array and use therewith |
US10777873B2 (en) | 2016-12-08 | 2020-09-15 | At&T Intellectual Property I, L.P. | Method and apparatus for mounting network devices |
US10326689B2 (en) | 2016-12-08 | 2019-06-18 | At&T Intellectual Property I, L.P. | Method and system for providing alternative communication paths |
US10069535B2 (en) | 2016-12-08 | 2018-09-04 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching electromagnetic waves having a certain electric field structure |
US10530505B2 (en) | 2016-12-08 | 2020-01-07 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching electromagnetic waves along a transmission medium |
US10938108B2 (en) | 2016-12-08 | 2021-03-02 | At&T Intellectual Property I, L.P. | Frequency selective multi-feed dielectric antenna system and methods for use therewith |
US9998870B1 (en) | 2016-12-08 | 2018-06-12 | At&T Intellectual Property I, L.P. | Method and apparatus for proximity sensing |
US10601494B2 (en) | 2016-12-08 | 2020-03-24 | At&T Intellectual Property I, L.P. | Dual-band communication device and method for use therewith |
US10916969B2 (en) | 2016-12-08 | 2021-02-09 | At&T Intellectual Property I, L.P. | Method and apparatus for providing power using an inductive coupling |
US9838896B1 (en) | 2016-12-09 | 2017-12-05 | At&T Intellectual Property I, L.P. | Method and apparatus for assessing network coverage |
US10340983B2 (en) | 2016-12-09 | 2019-07-02 | At&T Intellectual Property I, L.P. | Method and apparatus for surveying remote sites via guided wave communications |
US10264586B2 (en) | 2016-12-09 | 2019-04-16 | At&T Mobility Ii Llc | Cloud-based packet controller and methods for use therewith |
US9973940B1 (en) | 2017-02-27 | 2018-05-15 | At&T Intellectual Property I, L.P. | Apparatus and methods for dynamic impedance matching of a guided wave launcher |
US10298293B2 (en) | 2017-03-13 | 2019-05-21 | At&T Intellectual Property I, L.P. | Apparatus of communication utilizing wireless network devices |
US10516465B2 (en) * | 2017-09-11 | 2019-12-24 | Mediatek Inc. | Harmonized operation between radio link monitor and beam failure recovery |
US10367565B2 (en) * | 2017-12-12 | 2019-07-30 | Charter Communications Operating, Llc | Communications methods and apparatus using multiple beams |
US10797927B2 (en) | 2017-12-12 | 2020-10-06 | Charter Communications Operating, Llc | Methods and apparatus for supporting use of multiple beams for communications purposes |
Citations (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6229486B1 (en) * | 1998-09-10 | 2001-05-08 | David James Krile | Subscriber based smart antenna |
US6304215B1 (en) * | 1998-09-21 | 2001-10-16 | Tantivy Communications, Inc. | Method of use for an adaptive antenna in same frequency networks |
US6404386B1 (en) * | 1998-09-21 | 2002-06-11 | Tantivy Communications, Inc. | Adaptive antenna for use in same frequency networks |
US20020071403A1 (en) * | 2000-12-07 | 2002-06-13 | Crowe M. Shane | Method and system for performing a CDMA soft handoff |
US6456257B1 (en) * | 2000-12-21 | 2002-09-24 | Hughes Electronics Corporation | System and method for switching between different antenna patterns to satisfy antenna gain requirements over a desired coverage angle |
US20020137538A1 (en) * | 2001-03-23 | 2002-09-26 | Tao Chen | Wireless communications with an adaptive antenna array |
US6515635B2 (en) * | 2000-09-22 | 2003-02-04 | Tantivy Communications, Inc. | Adaptive antenna for use in wireless communication systems |
US20030114172A1 (en) * | 1999-08-31 | 2003-06-19 | Qualcomm, Incorporated | Method and apparatus for reducing pilot search times utilizing mobile station location information |
US6600456B2 (en) * | 1998-09-21 | 2003-07-29 | Tantivy Communications, Inc. | Adaptive antenna for use in wireless communication systems |
US20030222818A1 (en) * | 1998-09-21 | 2003-12-04 | Tantivity Communications, Inc. | Method and apparatus for adapting antenna array using received predetermined signal |
US20030228857A1 (en) * | 2002-06-06 | 2003-12-11 | Hitachi, Ltd. | Optimum scan for fixed-wireless smart antennas |
US20040023634A1 (en) * | 2002-07-18 | 2004-02-05 | Gibong Jeong | Method and apparatus for scheduling cell search in CDMA mobile receivers |
US20040029534A1 (en) * | 1998-02-13 | 2004-02-12 | Odenwalder Joseph P. | Method and system for performing a handoff in a wireless communication system, such as a hard handoff |
US6697642B1 (en) * | 2000-07-19 | 2004-02-24 | Texas Instruments Incorporated | Wireless communications apparatus |
US20040116110A1 (en) * | 2002-08-27 | 2004-06-17 | Messay Amerga | Searching for neighbor cells within a fixed time duration |
US20040127220A1 (en) * | 2002-03-08 | 2004-07-01 | Tantivy Communications, Inc. | Antenna adaptation to manage the active set to manipulate soft hand-off regions |
US6771622B1 (en) * | 2000-11-17 | 2004-08-03 | Koninklijke Philips Electronics N.V. | Pilot-signal searching with decimation reordering |
US7065373B2 (en) * | 2002-10-18 | 2006-06-20 | Itt Manufacturing Enterprises, Inc. | Method of steering smart antennas |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5303240A (en) * | 1991-07-08 | 1994-04-12 | Motorola, Inc. | Telecommunications system using directional antennas |
US5617102A (en) * | 1994-11-18 | 1997-04-01 | At&T Global Information Solutions Company | Communications transceiver using an adaptive directional antenna |
FI105515B (en) * | 1995-05-24 | 2000-08-31 | Nokia Networks Oy | A method for accelerating handoff and a cellular radio system |
US5903826A (en) * | 1996-12-06 | 1999-05-11 | Northern Telecom Limited | Extremely high frequency multipoint fixed-access wireless communication system |
US6900775B2 (en) * | 1997-03-03 | 2005-05-31 | Celletra Ltd. | Active antenna array configuration and control for cellular communication systems |
US6055428A (en) * | 1997-07-21 | 2000-04-25 | Qualcomm Incorporated | Method and apparatus for performing soft hand-off in a wireless communication system |
US6792290B2 (en) * | 1998-09-21 | 2004-09-14 | Ipr Licensing, Inc. | Method and apparatus for performing directional re-scan of an adaptive antenna |
US6473036B2 (en) * | 1998-09-21 | 2002-10-29 | Tantivy Communications, Inc. | Method and apparatus for adapting antenna array to reduce adaptation time while increasing array performance |
US6400317B2 (en) * | 1998-09-21 | 2002-06-04 | Tantivy Communications, Inc. | Method and apparatus for antenna control in a communications network |
KR100311506B1 (en) * | 1998-11-04 | 2001-11-15 | 서평원 | HandOff Control Method in Mobile Communication System |
US6594243B1 (en) * | 1999-07-15 | 2003-07-15 | Lucent Technologies Inc. | Methods and apparatus for enhanced soft handoff in a CDMA wireless communication system |
US6697542B2 (en) * | 2000-12-29 | 2004-02-24 | Lucent Technologies Inc. | Integrated optical switches using nonlinear optical media |
US7031652B2 (en) * | 2001-02-05 | 2006-04-18 | Soma Networks, Inc. | Wireless local loop antenna |
US6448938B1 (en) * | 2001-06-12 | 2002-09-10 | Tantivy Communications, Inc. | Method and apparatus for frequency selective beam forming |
FI120071B (en) * | 2001-09-14 | 2009-06-15 | Nokia Corp | A method for performing measurements on a wireless terminal and a wireless terminal |
US6628235B2 (en) * | 2001-12-17 | 2003-09-30 | The Boeing Company | Method for phased array antenna signal handoff |
US6816116B2 (en) * | 2002-03-22 | 2004-11-09 | Quanta Computer, Inc. | Smart antenna for portable devices |
US7177644B2 (en) * | 2003-02-12 | 2007-02-13 | Nortel Networks Limited | Distributed multi-beam wireless system |
US7068373B2 (en) * | 2003-02-28 | 2006-06-27 | Honeywell International Inc. | Piezoelectric transducer configured for use as a path length control apparatus for an optical device comprising a central void region |
-
2004
- 2004-12-30 US US11/026,296 patent/US7274936B2/en not_active Expired - Fee Related
-
2005
- 2005-01-28 WO PCT/US2005/003476 patent/WO2005076903A2/en active Search and Examination
- 2005-01-31 TW TW094102941A patent/TWI261982B/en not_active IP Right Cessation
- 2005-01-31 TW TW094131738A patent/TW200631335A/en unknown
-
2007
- 2007-09-24 US US11/903,709 patent/US8320919B2/en not_active Expired - Fee Related
Patent Citations (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040029534A1 (en) * | 1998-02-13 | 2004-02-12 | Odenwalder Joseph P. | Method and system for performing a handoff in a wireless communication system, such as a hard handoff |
US6229486B1 (en) * | 1998-09-10 | 2001-05-08 | David James Krile | Subscriber based smart antenna |
US6600456B2 (en) * | 1998-09-21 | 2003-07-29 | Tantivy Communications, Inc. | Adaptive antenna for use in wireless communication systems |
US6304215B1 (en) * | 1998-09-21 | 2001-10-16 | Tantivy Communications, Inc. | Method of use for an adaptive antenna in same frequency networks |
US20030222818A1 (en) * | 1998-09-21 | 2003-12-04 | Tantivity Communications, Inc. | Method and apparatus for adapting antenna array using received predetermined signal |
US6404386B1 (en) * | 1998-09-21 | 2002-06-11 | Tantivy Communications, Inc. | Adaptive antenna for use in same frequency networks |
US20030114172A1 (en) * | 1999-08-31 | 2003-06-19 | Qualcomm, Incorporated | Method and apparatus for reducing pilot search times utilizing mobile station location information |
US6697642B1 (en) * | 2000-07-19 | 2004-02-24 | Texas Instruments Incorporated | Wireless communications apparatus |
US6515635B2 (en) * | 2000-09-22 | 2003-02-04 | Tantivy Communications, Inc. | Adaptive antenna for use in wireless communication systems |
US6771622B1 (en) * | 2000-11-17 | 2004-08-03 | Koninklijke Philips Electronics N.V. | Pilot-signal searching with decimation reordering |
US20020071403A1 (en) * | 2000-12-07 | 2002-06-13 | Crowe M. Shane | Method and system for performing a CDMA soft handoff |
US6456257B1 (en) * | 2000-12-21 | 2002-09-24 | Hughes Electronics Corporation | System and method for switching between different antenna patterns to satisfy antenna gain requirements over a desired coverage angle |
US20020137538A1 (en) * | 2001-03-23 | 2002-09-26 | Tao Chen | Wireless communications with an adaptive antenna array |
US20040127220A1 (en) * | 2002-03-08 | 2004-07-01 | Tantivy Communications, Inc. | Antenna adaptation to manage the active set to manipulate soft hand-off regions |
US20030228857A1 (en) * | 2002-06-06 | 2003-12-11 | Hitachi, Ltd. | Optimum scan for fixed-wireless smart antennas |
US20040023634A1 (en) * | 2002-07-18 | 2004-02-05 | Gibong Jeong | Method and apparatus for scheduling cell search in CDMA mobile receivers |
US20040116110A1 (en) * | 2002-08-27 | 2004-06-17 | Messay Amerga | Searching for neighbor cells within a fixed time duration |
US7065373B2 (en) * | 2002-10-18 | 2006-06-20 | Itt Manufacturing Enterprises, Inc. | Method of steering smart antennas |
Also Published As
Publication number | Publication date |
---|---|
TWI261982B (en) | 2006-09-11 |
US7274936B2 (en) | 2007-09-25 |
US8320919B2 (en) | 2012-11-27 |
TW200631335A (en) | 2006-09-01 |
TW200534623A (en) | 2005-10-16 |
WO2005076903A3 (en) | 2006-11-09 |
US20080020715A1 (en) | 2008-01-24 |
US20050181733A1 (en) | 2005-08-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7274936B2 (en) | Method and apparatus for measuring channel quality using a smart antenna in a wireless transmit/receive unit | |
JP4977732B2 (en) | Method and apparatus for reducing the transient effects of beam switching in a switched beam antenna system | |
KR100277761B1 (en) | Estimation method of the window size of mobile station in a cellular system | |
KR100865343B1 (en) | Method for performing measurements for handoff of a mobile unit operating with a switched beam antenna in a wireless communication system, and corresponding system | |
JP3447265B2 (en) | Channel communication apparatus and method for code division multiple access communication system | |
US5937005A (en) | Error rate measurement apparatus for a mobile radio communications system | |
US7706329B2 (en) | Method and apparatus for compressed mode handling in a dual receiver user equipment (UE) | |
US7146164B2 (en) | Intelligent base station antenna beam-steering using mobile multipath feedback | |
US20050176468A1 (en) | Wireless communication method and apparatus for selecting and reselecting cells based on measurements performed using directional beams and an omni-directional beam pattern | |
US20090010364A1 (en) | Parameter estimation for adaptive antenna system | |
CA2308425C (en) | Device and method for communicating reverse pilot signal in mobile communication system | |
KR100335689B1 (en) | Communication terminal apparatus and radio receving method | |
EP1933472B1 (en) | Mobile communication system, user equipment, control program and synchronization establishment determination method in mobile communication system | |
JP3369489B2 (en) | Wireless communication device and wireless communication method | |
WO2005065171A2 (en) | Method and apparatus for supporting a soft handoff by establishing a cell set used to facilitate antenna beam mode transitions in a mobile station | |
JP2006054625A (en) | Mobile communication system, mobile communication terminal, and handover control method used for them and program thereof | |
JP4298932B2 (en) | Transmit diversity communication device | |
US8073490B2 (en) | Mobile station direction finding based on observation of forward link | |
JP3835724B2 (en) | Synchronization method and synchronization circuit | |
US7009947B2 (en) | Integrity of pilot phase offset measurements for predicting pilot strength | |
JPH1023499A (en) | Mobile communication system | |
AU4436802A (en) | Signal transmitting and receiving method and device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A2 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWW | Wipo information: withdrawn in national office |
Country of ref document: DE |
|
122 | Ep: pct application non-entry in european phase | ||
DPE1 | Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101) |