WO2017171799A1 - Attribution de sous-porteuses dans des réseaux sur courant porteur - Google Patents

Attribution de sous-porteuses dans des réseaux sur courant porteur Download PDF

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Publication number
WO2017171799A1
WO2017171799A1 PCT/US2016/025316 US2016025316W WO2017171799A1 WO 2017171799 A1 WO2017171799 A1 WO 2017171799A1 US 2016025316 W US2016025316 W US 2016025316W WO 2017171799 A1 WO2017171799 A1 WO 2017171799A1
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WO
WIPO (PCT)
Prior art keywords
power line
subset
subcarriers
pair
identified
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.)
Ceased
Application number
PCT/US2016/025316
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English (en)
Inventor
Ioannis Pefkianakis
Kamran Ali ALI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hewlett Packard Enterprise Development LP
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Hewlett Packard Enterprise Development LP
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Filing date
Publication date
Application filed by Hewlett Packard Enterprise Development LP filed Critical Hewlett Packard Enterprise Development LP
Priority to PCT/US2016/025316 priority Critical patent/WO2017171799A1/fr
Publication of WO2017171799A1 publication Critical patent/WO2017171799A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/544—Setting up communications; Call and signalling arrangements
    • 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
    • H04L5/0037—Inter-user or inter-terminal allocation
    • 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
    • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
    • H04L5/0046—Determination of the number of bits transmitted on different sub-channels
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT

Definitions

  • PLC Power Line Communication
  • AC Alternating Current
  • PLC devices e.g., adapters that plug into a home or office power outlet, may be used to form PLC networks, which can be used to transmit data between devices connected to the PLC devices.
  • PLC devices may be used to extend data communications from one portion of a building to another, using existing power lines as opposed to Wi-Fi range extenders, coaxial cables, twisted pair cabling, and other alternatives.
  • PLC technology may offer some entities an additional form of network communications that may be preferable to the alternatives.
  • FIG. 1 is a block diagram of an example computing device for allocating subcarriers in a power line network.
  • FIG. 2A depicts an illustration of a first example tonemap used to allocate subcarriers in power line networks
  • FIG. 2B depicts an illustration of a second example tonemap used to allocate subcarriers in power line networks.
  • FIG. 3 is a data flow depicting the allocation of subcarriers in a power line network.
  • FIG. 4 is a flowchart of an example method for allocating subcarriers in power line networks.
  • FIG. 5 is a flowchart of an example method for allocating subcarriers in a power line network.
  • Power Line Communications (PLC) devices may be used to create data networks, e.g., using CSMA/CA MAC-iayer protocols to access the power line communication medium, which is based on an orthogonal frequency division multiplexing (OFDM) scheme using 917 signal subcarriers.
  • PLC networks are capable of performing at relatively high data transfer speeds; however, frequency channelization and spectrum sharing are not supported.
  • subcarriers may be allocated to PLC device pairs in a manner designed to achieve relatively high PLC network throughput and allow all PLC devices operating on the PLC network to communicate at the same time,
  • two pairs of PLC devices may be part of a PLC network for transmitting data.
  • Each pair of PLC devices may produce a tonemap that indicates signal strength across each signal subcarrier.
  • the tonemap may indicate strength, for example, by specifying the number of modulated bits for each signal subcarrier of the PLC network at a given point in time, or over a period of time. For example, a relatively high number of modulated bits would indicate a relatively high quality signal for a particular signal subcarrier, while a relatively low number of modulated bits would indicate a relatively low quality signal for another signal subcarrier.
  • the tonemaps may be used to allocate subcarriers to each pair of PLC devices.
  • tonemaps may reveal that a first pair of devices has high performance/modulation with a first subset of the signal subcarriers but poor performance/modulation with a second subset of the signal subcarriers, and a second pair of devices has high performance/modulation with the second subset but poor performance/modulation with the first subset.
  • the first subset may be allocated to the first pair of devices while the second subset is allocated to the second pair of devices. This allows both pairs of devices to communicate at the same time and at a relatively high level of performance. Further details regarding the allocation of signal subcarriers is described below.
  • FIG. 1 is a block diagram 100 of an example computing device 110 for allocating subcarriers in power line networks.
  • Computing device 110 may be, for example, a power line adapter or other power line device, or a computing device connected to the power line network, such as a personal computer, a server computer, or any other similar electronic device capable of communicating with PLC network devices.
  • the computing device 10 includes a hardware processor, 120, and machine-readable storage medium, 130.
  • Hardware processor 120 may be one or more central processing unite (CPUs), semiconductor-based microprocessors, and/or other hardware devices suitable for retrieval and execution of instructions stored in machine-readable storage medium, 130. Hardware processor 120 may fetch, decode, and execute instructions, such as 132-140, to control processes for allocating subcarriers in power line networks. As an alternative or in addition to retrieving and executing instructions, hardware processor 120 may include one or more electronic circuits that include electronic components for performing the functionality of one or more instructions.
  • CPUs central processing unite
  • semiconductor-based microprocessors such as 132-140
  • hardware processor 120 may include one or more electronic circuits that include electronic components for performing the functionality of one or more instructions.
  • a machine-readable storage medium such as 130, may be any electronic, magnetic, optical, or other physical storage device that contains or stores executable instructions.
  • machine-readable storage medium 130 may be, for example, Random Access Memory (RAM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a storage device, an optical disc, and the like.
  • RAM Random Access Memory
  • EEPROM Electrically Erasable Programmable Read-Only Memory
  • storage medium 130 may be a non- transitory storage medium, where the term "non-transitory" does not encompass transitory propagating signals.
  • machine-readable storage medium 130 may be encoded with executable instructions: 132-140, for allocating subcarriers in power line networks.
  • FIG. 1 also depicts two separate pairs of power line devices, the first power line device pair 150 and the second power line device pair 160.
  • Each device included in a pair may be, for example, a power line adapter that plugs into an electrical outlet. While the power line device pairs are depicted separately from the computing device 110, in some implementations the computing device 110 may be or may be included in one of the power line devices of the device pairs, e.g., such that a power line adapter paired with another power line adapter executes instructions 132-140.
  • the hardware processor 120 executes instructions 32 to obtain, from the first power line device pair 150, physical layer feedback in the form of a first tonemap 152 that specifies a number of modulated bits per subcarrier, e.g., for communications between the PLC devices included in the first pair 150.
  • the first tonemap 152 may, in some implementations, be one of many provided to the computing device 110 periodically, randomly, or at specific points in time, e.g., in response to user input and/or upon detecting data transmissions between the devices of the first pair 150.
  • the hardware processor 120 executes instructions 134 to obtain, for a second power line device pair 180, physical layer feedback in the form of a second tonemap 162 that specifies a number of modulated bits per subcarrier, e.g., for communications between the PLC devices included in the second pair 160.
  • the second tonemap 162 may, in some implementations, be one of many provided to the computing device 110 periodically, randomly, or at specific points in time.
  • each pair of power line devices may also provide corresponding tonemaps to the computing device 110.
  • Each pair of power line devices that provides a tonemap to the computing device operates on the same PLC network as each other pair providing tonemaps.
  • each pair of power line devices may be placed in electrical outlets throughout a home or place of business and connected to the same circuit.
  • the hardware processor 120 executes instructions 136 to identify, based on the first tonemap 152 and second tonemap 162, a first and second subset of the signal subcarriers.
  • the manner in which the first and second subsets are identified may vary depending on the implementation and a variety of other factors.
  • the computing device 110 identifies the subsets in a manner designed to maximize modulation across the PLC network. This may be performed, for example, by assigning each subcarrier to a subset for the pair of power line devices for which the subcarrier experienced the highest modulation/performance.
  • subcarriers 1-100 may be identified as belonging to a first subset for the first power line device pair 50.
  • the computing device 110 identifies the subsets based on bandwidth values obtained from each pair of power line devices. For example, each pair of power line devices may have certain bandwidth requirements or expectations based on previous use. In this situation, the computing device 110 may identify subcarriers in a manner designed to meet the bandwidth requirements, instead of or in addition to maximizing total PLC network throughput. In some implementations, the computing device 110 may generate estimated bandwidth values for each pair of PLC devices using the modulated bits identified in the corresponding tonemaps, and the estimated bandwidth values may be used to identify subcarrier subsets. In some implementations, power consumption may be taken into consideration when identifying subsets of subcarriers.
  • subcarriers may be identified in a manner designed to meet certain minimum bandwidth requirements while also minimizing power consumption.
  • subcarriers identified as belonging to one subset are not included in any other subset, e.g., each subset includes subcarriers that are different from those included in each other subset.
  • one or more known selection algorithms may be used to identify subcarrier subsets. For example, subsets may be identified using recursive combinations designed to meet certain PLC device pair throughput estimates, power consumption levels, bandwidth requirements, and/or other goals described above. Other algorithms, such as exhaustive searching and greedy approaches may also be used.
  • the hardware processor 120 executes instructions 138 to allocate the first subset 154 of subcarriers to the first pair of power line devices 150.
  • the first subset 54 may, in some implementations, include instructions that cause the first power line device pair 150 to communicate with each other using only the subcarriers specified in the first subset 154,
  • the hardware processor 120 executes instructions 140 to allocate the second subset 164 of subcarriers to the second pair of power line devices 160.
  • the second subset 164 may include instructions that cause the second power line device pair 160 to communicate with each other using only the subcarriers specified in the second subset 164.
  • FIG. 2A depicts an illustration of a first example tonemap 200 used to allocate subcarriers in power line networks, such as an allocation of the first subset 54 to the first pair of power line devices 150 described above with respect to FIG. 1.
  • FIG. 2B depicts an illustration of a second example tonemap 250 used to allocate subcarriers in power line networks, such as an allocation of the second subset 164 to the second pair of power line devices 160 described above with respect to FIG. 1.
  • the tonemap indicates, for subcarriers 1-917, the number of modulated bits per subcarrier.
  • those same subcarriers between dotted lines 252 and 254 perform - on average - relatively well compared to the performance measured in the first tonemap 200.
  • a first subset of subcarriers e.g., subcarriers 1- 75 and 500-917, may be allocated to the pair of PLC devices associated with the first tonemap 200.
  • a second subset of subcarriers e.g., 176-499, may be allocated to the pair of PLC devices associated with the second tonemap 250.
  • the example tonemaps, subsets, and allocation described above is one example that uses a relatively coarse identification and allocation of subcarriers based on performance, e.g., modulation.
  • the manner in which subcarriers are allocated may vary based on a variety of factors.
  • each individual subcarrier may be assigned based on one or more of the factors described above. For example, a PLC device may assign each individual subcarrier based on which pair of PLC devices the subcarrier performed better on, with ties being broken by which pair of devices has a higher bandwidth requirement or higher average throughput.
  • subcarrier may be allocated to a pair of PLC devices even when that subcarrier has higher modulation with a different pair of PLC devices, e.g., based on minimum bandwidth requirements or power consumption factors. Other methods of allocation may also be used,
  • FIG. 3 is a data flow 300 depicting the allocation of subcarriers in a power line network.
  • Each pair of power line devices, 310, 320, 330 may be the same as or similar to the pairs of power line devices described above with respect to FIG. 1.
  • the data flow 300 includes a subcarrier allocation device 340, which may be any computing device, such as computing device 110 of FIG. 1.
  • subcarrier allocation device 340 is depicted in the data flow 300 as a device that is separate from the PLC device pairs, 310, 320, 330, in some implementations the subcarrier allocation device 340 may be implemented within or by one of the PLC devices included in one of the PLC device pairs, e.g., implemented in a power line adapter.
  • the subcarrier allocation device 340 receives physical layer feedback, e.g., in the form of tonemaps 312, 322, 332, from each pair of power line devices, e.g., power line device pair 1 310, device pair 2 320, and device pair N 330.
  • any number of PLC device pairs may be included in a PLC network and provide tonemaps to the subcarrier allocation device 240.
  • Each tonemap specifies, for each signal subcarrier, a number of modulated bits. Tonemaps may be expressed in a variety of ways and, in some implementations, the tonemaps may be expressed as depicted in FIGs. 2A and 2B. in the example data flow 300, example tonemap 312 is depicted in a table format, specifying the number of modulated bits for each subcarrier within a table.
  • power line device pairs may provide additional information to the subcarrier allocation device, such as bandwidth requirements, throughput measurements, or other information that may be used to allocate subcarriers.
  • a third party such as a user or a separate computing device, may provide some or all of this additional information to the subcarrier allocation device 340.
  • the subcarrier allocation device 340 identifies, based on the tonemaps, a subset of signal subcarriers for each pair of power line devices. For example, the data flow depicts subsets 1 314, 2 324, and N 334, which were identified using the tonemaps 1 312, 2, 322, and N 332, respectively.
  • the subset 334 for device pair N 330 includes, by way of example, subcarriers 100-150, 375-475, and 800- 900.
  • the manner in which the subcarrier allocation device 340 identifies subsets e.g., the information and method used, may vary. In implementations where additional information, such as bandwidth, throughput, or power consumption, is available to the subset allocation device 340, the additional information may be used in identifying subcarrier subsets.
  • the subcarrier allocation device 340 allocates one of the identified subcarrier subsets to each power line device pair. For example, allocation 1 316 corresponds to subset 1 314 and is provided to the power line device pair 1 310, allocation 2 326 corresponds to subset 2 324 and is provided to power line device pair 2 320, and allocation N 336 corresponds to subset N 334 and is provided to power line device pair N 330.
  • the allocation of subcarriers to pairs of power line devices causes the corresponding pairs of devices to communicate to each other using only the allocated subcarriers. For example, allocation N 336 specifies that the power line devices included in power line device pair N 330 should only communicate with each other using subcarriers 100-150, 375-475, and 800-900.
  • the example data flow 300 depicts a process that may vary and may be repeated over time, e.g., making adjustments to allocations based on changing conditions. For example, electrical interference may cause changes in tonemaps, which may cause the subcarrier allocation device 340 to make new allocations. In situations where new PLC device pairs are added to the PLC network, or existing PLC device pairs are removed from the PLC network, subcarriers may be reallocated.
  • subcarriers may be reallocated on a regular basis, e.g., hourly, daily, or weekly, and/or may occur in response to a particular event, e.g., a new source of electrical interference being added to the network or in response to changes in bandwidth requirements or average throughput experienced by one or more of the PLC device pairs.
  • Reallocation when performed, may be performed in the same or a similar manner as the method for allocation described above.
  • FIG. 4 is a flowchart of an example method 400 for allocating subcarriers in power line networks.
  • the method 400 may be performed by a computing device, such as a computing device described in FIG. 1 , e.g., in the form of a power line adapter or personal computer. Other computing devices may also be used to execute method 400.
  • Method 400 may be implemented in the form of executable instructions stored on a machine-readable storage medium, such as the storage medium 130, and/or in the form of electronic circuitry, such as an FPGA or ASIC.
  • the physical layer feedback includes a tonemap specifying, for each of a plurality of signal subcarriers, a number of modulated bits (402).
  • the number of modulated bits may provide an indication, for each subcarrier, of the performance of that subcarrier with respect to communications between the corresponding pair of power line devices, e.g., with a higher number of modulated bits indicating higher performance, than a lower number of modulated bits.
  • the power line device pairs that provide tonemaps may all be included in a single PLC network, e.g., they are all attached to the same electric circuit, such as a home power circuit or the power circuit of an office building.
  • a subset of the signal subcarriers is identified based on the tonemaps (404). Based on one or more factors, which may include modulation, interference, throughput, bandwidth, power consumption, signal subcarrier subsets are identified in a manner designed to achieve a certain goal. Those goals may include maximizing throughput or performance, minimizing power consumption, meeting minimum bandwidth requirements for certain power line device pairs, or other similar goals.
  • One example method may be to identify signal subcarriers in a manner designed to achieve the aggregate maximum modulation across all PLC devices of the PLC network. Many other methods may be used, alone or in combination with others, to perform the actual identification of subcarriers. in some implementations, each subcarrier is included in only one of the identified subsets.
  • a bandwidth value may be obtained for each pair of power line devices.
  • the bandwidth value may be provided by each corresponding power line device pair or provided by a third party user or device.
  • the bandwidth value is an estimated bandwidth value generated based on the number of modulated bits identified for some or all of the signal subcarriers. in situations where estimated bandwidth is obtained or generated, subcarrier subsets may be identified based on the estimated bandwidth, e.g., in a manner designed to maximize bandwidth.
  • candidate subsets of the signal subcarriers may be identified, and subcarrier subsets may be identified from the candidate subsets.
  • candidate subsets may be recursively identified in a manner designed to select candidate subsets for each pair of PLC devices that would meet bandwidth requirement provided by or calculated for the corresponding pairs of PLC devices.
  • the actual subsets identified, e.g., for allocation to the PLC device pairs, may be selected from the candidate subsets, e.g., in a manner designed to ensure ail PLC device pairs are provided with signal carrier subsets that allow them to meet certain bandwidth requirements.
  • Each of the identified subcarrier subsets is allocated to a corresponding one of the power line device pairs (406).
  • the allocation may cause, for example, the power line devices included in the device pairs to communicate with each other only across those signal subcarriers.
  • the allocation includes providing instructions to power line devices, in some implementations, each power line device may have its own instructions to restrict communications to particular subcarriers in response to receiving an allocation.
  • a server computer may collect tonemaps and perform the subcarrier subset identification, while a particular power line adapter receives the subsets and distributes the subset allocation data to other power line adapters.
  • FIG. 5 is a flowchart of an example method 500 for allocating subcarriers in a power line network.
  • the method 500 may be performed by a computing device, such as a computing device described in FIG. 1 , e.g., in the form of a power line adapter. Other computing devices may also be used to execute method 500.
  • Method 500 may be implemented in the form of executable instructions stored on a machine-readable storage medium, such as the storage medium 130, and/or in the form of electronic circuitry, such as an FPGA or ASIC.
  • a first power line device obtains first physical layer feedback that includes a first tonemap specifying, for each of a plurality of signal subcarriers, a first number of modulated bits for communications between the first power line device and a second power line device (502).
  • a power line adapter may generate, or obtain from its paired power line adapter, a tonemap showing modulated bits per subcarrier for communications between the power line adapter and its paired adapter.
  • the first power line device obtains second physical layer feedback that includes a second tonemap specifying, for each of the signal subcarriers, a second number of modulated bits for communications between a second pair of power line devices that does not include the first power line device or second power line device (504).
  • the power line adapter may obtain a tonemap from another different adapter that is also part of the PLC network, e.g., a third adapter that is communicating with a fourth adapter.
  • a first and second subset of the signal subcarriers are identified (506).
  • the power line adapter may perform the identification of signal subcarrier subsets, e.g., using any of the methods described above.
  • each signal subcarrier is included in only one subset.
  • Instructions are provided for the second pair of power line devices to use the second subset of signal subcarriers for future power line network communications (508).
  • the power line adapter may send to one of the devices included in the second pair of power line adapters, or cause to be sent to using a third party computing device, data that identifies the second subset of signal subcarriers.
  • the first subset of signal subcarriers are used to communicate with the second power line device (510).
  • the power line adapter after instructing the second pair of PLC devices on the PLC network to communicate using the signal subcarriers of the second subset, may communicate with its paired adapter using the subcarriers of the first subset.
  • This allocation is designed to ensure that the PLC device pairs do not compete over signal subcarriers, which may prevent transmission of data between one pair of devices until the other pair of devices is finished.
  • both pairs of PLC devices may communicate concurrently across different subcarriers, which may reduce the likelihood of delays in transmitting data across the PLC network.
  • the method 500 is described with respect to a power line device, other computing devices or multiple computing devices may also be used for performing some or ail of the features.
  • multiple power line adapters may be used to identify signal carrier subsets and/or provide allocation instructions to other power line device pairs.
  • examples provide a mechanism for allocating subcarriers to power line device pairs using tonemaps produced by power line devices.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

Des exemples de l'invention concernent l'attribution de sous-porteuses dans des réseaux sur courant porteur. Dans un exemple, un dispositif informatique peut : obtenir, pour chaque paire d'une pluralité de paires de dispositifs de ligne électrique, une rétroaction de couche physique qui comprend un mappage de tonalités spécifiant, pour chaque sous-porteuse d'une pluralité de sous-porteuses de signal, un nombre de bits modulés ; identifier, pour chaque paire de la pluralité de paires de dispositifs de ligne électrique et en fonction des mappages de tonalités, un sous-ensemble de la pluralité de sous-porteuses de signal ; et attribuer, à chaque paire de la pluralité de paires de dispositifs de ligne électrique, un sous-ensemble correspondant parmi les sous-ensembles identifiés de la pluralité de sous-porteuses de signal.
PCT/US2016/025316 2016-03-31 2016-03-31 Attribution de sous-porteuses dans des réseaux sur courant porteur Ceased WO2017171799A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2016/025316 WO2017171799A1 (fr) 2016-03-31 2016-03-31 Attribution de sous-porteuses dans des réseaux sur courant porteur

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Application Number Priority Date Filing Date Title
PCT/US2016/025316 WO2017171799A1 (fr) 2016-03-31 2016-03-31 Attribution de sous-porteuses dans des réseaux sur courant porteur

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120134430A1 (en) * 2010-11-25 2012-05-31 Yuan-Hwa Li Method of Handling Tone Map Interpolation and Related Communication Device
US20130107974A1 (en) * 2009-12-30 2013-05-02 Sony Corporation Communications system using beamforming
US8711953B2 (en) * 2007-07-23 2014-04-29 Sony Corporation Method for transmitting a signal from a transmitter to a receiver in a power line communication network, transmitter, receiver, power line communication modem and power line communication system
US20150063365A1 (en) * 2013-08-06 2015-03-05 Cisco Technology, Inc. Dynamic frame selection when requesting tone map parameters in mesh networks
US20150172073A1 (en) * 2012-02-22 2015-06-18 Texas Instruments Incorporated Transmission of Segmented Frames in Power Line Communication

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8711953B2 (en) * 2007-07-23 2014-04-29 Sony Corporation Method for transmitting a signal from a transmitter to a receiver in a power line communication network, transmitter, receiver, power line communication modem and power line communication system
US20130107974A1 (en) * 2009-12-30 2013-05-02 Sony Corporation Communications system using beamforming
US20120134430A1 (en) * 2010-11-25 2012-05-31 Yuan-Hwa Li Method of Handling Tone Map Interpolation and Related Communication Device
US20150172073A1 (en) * 2012-02-22 2015-06-18 Texas Instruments Incorporated Transmission of Segmented Frames in Power Line Communication
US20150063365A1 (en) * 2013-08-06 2015-03-05 Cisco Technology, Inc. Dynamic frame selection when requesting tone map parameters in mesh networks

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