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WO2015050578A2 - Configuration de communications de réseau sans fil - Google Patents

Configuration de communications de réseau sans fil Download PDF

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Publication number
WO2015050578A2
WO2015050578A2 PCT/US2014/023732 US2014023732W WO2015050578A2 WO 2015050578 A2 WO2015050578 A2 WO 2015050578A2 US 2014023732 W US2014023732 W US 2014023732W WO 2015050578 A2 WO2015050578 A2 WO 2015050578A2
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WO
WIPO (PCT)
Prior art keywords
access point
data
cell
wireless devices
interference
Prior art date
Application number
PCT/US2014/023732
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English (en)
Other versions
WO2015050578A3 (fr
Inventor
Akira Ito
Chenxi Zhu
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Fujitsu Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Publication of WO2015050578A2 publication Critical patent/WO2015050578A2/fr
Publication of WO2015050578A3 publication Critical patent/WO2015050578A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0094—Bus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/27—Control channels or signalling for resource management between access points

Definitions

  • the embodiments discussed herein are related to configuring wireless network communications .
  • access points in multiple cells may use Cooperative Multipoint (CoMP) transmission schemes for coordinating downlink transmissions to wireless devices.
  • CoMP Cooperative Multipoint
  • LTE-A Long Term Evolution - Advanced
  • access points in different cells may exchange their relatively narrow band transmit powers that are deployed to communicate wireless communications from the access points to associated wireless devices. Based on the relatively narrow band transmit powers received from other access points, the access points may adjust their relatively narrow band transmit powers.
  • a method of configuring wireless network communications may include transmitting a reference signal from a first access point in a first cell to a wireless device in a second cell.
  • the wireless device may also be associated with a second access point in the second cell.
  • the method may further include receiving, at the second access point, channel data from the wireless device.
  • the channel data may be generated by the wireless device based on the reference signal received by the wireless device.
  • the method may further include estimating, based on the received channel data, interference in the second cell due to transmissions originating in the first cell.
  • FIG. 1 illustrates an example wireless communication network
  • FIG. 2 illustrates another example wireless communication network
  • FIG. 3 is an example wireless device that may operate in a wireless communication network
  • FIG. 4 illustrates another example wireless communication network
  • FIG. 5 is a flowchart of an example method of configuring wireless network communications .
  • a wireless communication system may be configured with multiple access points.
  • Each of the access points may be associated with an area, referred to as a cell, and may be configured to service wireless devices in their associated cell.
  • the wireless communication system may be configured such that the access points may communicate information amongst themselves regarding interference in one cell due to transmissions originating in another cell.
  • a first access point in a first cell may send a reference signal to wireless devices in a second cell not associated with the first access point.
  • the wireless devices may generate channel data, such as precoding data, rank indictors, channel quality data, among other data, based on the reference signal.
  • the wireless devices may send the channel data to a second access point in the second cell.
  • the second access point may estimate interference in the second cell caused by transmissions originating in the first cell based on the channel data from the wireless devices.
  • the second access point may send the estimated interference to the first access point.
  • the first access point may adjust its transmission parameters, such as precoding indicators, signal strength, signal timing, frequencies of transmission, among others, based on estimated interference. By adjusting the transmission parameters, the first access point may reduce interference in the second cell.
  • FIG. 1 illustrates an example wireless communication network 100 (referred to hereinafter as "the network 100"), arranged in accordance with at least one embodiment described herein.
  • the network 100 may be configured to provide wireless communication services to a wireless device 120 via a first access point 110.
  • the wireless communication services may be voice services, data services, messaging services, and/or any suitable combination thereof.
  • the network 100 may include a Frequency Division Multiple Access (FDMA) network, an Orthogonal FDMA (OFDMA) network, a Code Division Multiple Access (CDMA) network, a Time Division Multiple Access (TDMA) network, and/or any other suitable wireless communication network.
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal FDMA
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • the network 100 may be configured as a third generation (3G) wireless communication network and/or a fourth generation (4G) wireless communication network.
  • the network 100 may be configured as a long-term evolution (LTE) wireless communication network.
  • the network 100 may also include a second access point 130.
  • the first and second access points 110 and 130 may be any suitable wireless communication network communication points and may include, by way of example but not limitation, a base station, an evolved node "B" (eNB) base station, a remote radio head (R H), or any other suitable communication point.
  • the wireless device 120 may include any device that may use the network 100 for obtaining wireless communication services and may include, by way of example and not limitation, a cellular phone, a smartphone, a personal data assistant (PDA), a laptop computer, a personal computer, a tablet computer, or any other similar device.
  • PDA personal data assistant
  • the first and second access points 110 and 130 may be located in first and second cells 114 and 134, respectively, and may be communicatively coupled by an interface 140.
  • the interface 140 may be a wired interface, an optical interface, or some other interface. In the context of LTE wireless communication networks, in some embodiments, the interface 140 may be an X2 interface.
  • the first access point 110 may be configured to provide wireless communication services to wireless devices within the first cell 114.
  • the second access point 130 may be configured to provide wireless communication services to wireless devices within the second cell 134.
  • the first and second access points 110 and 130 may be configured to send some wireless signals to wireless devices outside their corresponding cell; however, the first and second access points 110 and 130 may have primary responsibility for coordinating the wireless communications for the wireless devices within their respective cells 114 and 134.
  • the first access point 110 may be configured to send a first reference signal, such as one or more known symbols or some other known signal, over a first wireless path, referred to as a first channel 112, to the wireless device 120.
  • the second access point 130 may be configured to send a second reference signal, such as one or more known symbols or some other known signal, over a second wireless path, referred to as a second channel 132, to the wireless device 120.
  • the first reference signal and the second reference signal may be the same type of reference signals.
  • both the first and second reference signals may be non-zero power reference signals.
  • the first and second reference signals may be non-zero power (N-ZP) channel state information reference signals (CSI-RS).
  • the first and second reference signals may be transmitted in orthogonal resources, such as at different times, using different frequencies, with different configurations by using different code words, or some combination thereof.
  • the first and second reference signals may be different reference signals.
  • the first reference signal may be an N-ZP CSI-RS and the second reference signal may be a zero-power CSI-RS or some other CSI type signal.
  • the wireless device 120 may be configured to characterize the first and second channels 112 and 132 using the first and second reference signals, respectively.
  • characterizing the first and second channels 112 and 132 may include determining transfer functions or properties of the first and second channels 112 and 132.
  • the characterizations of the first and second channels 112 and 132 may describe how a signal propagates between a transmitting antenna and a receiving antenna taking into account the effects of scattering, fading, power decay, and/or other factors that affect wireless data transmissions.
  • the characterizations of the first and second channels 112 and 132 may be used by the wireless device 120 to determine various other types of data associated with the first and second channels 112 and 132, such as precoding data, including precoding matrix indicators, channel quality data, including channel quality indicators, rank indicators, etc. that are applicable for the first and second channels 112 and 132.
  • precoding data including precoding matrix indicators
  • channel quality data including channel quality indicators, rank indicators, etc.
  • the characterizations of the first and second channels 112 and 132 and/or the other data associated with the first and second channels 112 and 132 may be referred to herein as channel data.
  • the channel data may be referred to as channel state information (CSI).
  • the wireless device 120 may send the channel data to the first access point 110.
  • the first access point 110 may use the channel data generated based on the first reference signal transmitted in the first channel 112 to determine parameters for transmitting downlink signals from the first access point 110 to the wireless device 120.
  • the first access point 110 may use the channel data generated based on the second reference signal transmitted in the second channel 132 to estimate interference in the first cell 114 due to transmissions originating in the second cell 134.
  • the first access point 110 may use the channel data generated based on the second reference signal transmitted in the second channel 132 to estimate interference in the first cell 114 due to downlink transmissions transmitted by the second access point 130.
  • the first access point 110 may send the estimated interference to the second access point 130 over the interface 140.
  • the second access point 130 may be configured to select parameters for downlink transmission of data from the second access point 130 to wireless devices in the second cell 134 based on the estimated interference.
  • the parameters selected by the second access point 130 may include, when the downlink transmission occurs (e.g., time resources), precoding data for the downlink transmission, a power level of the downlink transmission, and frequencies for the downlink transmission (e.g., frequency resources), among others.
  • the parameters selected by the second access point 130 may result in the second access point 130 changing a transmission pattern of transmission originating in the second cell 134, such as downlink transmissions from the second access point 130 in the second cell 134.
  • Changing the transmission pattern of transmissions originating in the second cell 134 may reduce interference in the first cell 114 due to transmissions originating in the second cell 134.
  • the second access point 130 may balance the service level being provided to the wireless devices in the second cell 134 and the interference in the first cell 114 due to transmissions originating in the second cell 134.
  • the second access point 130 may send an indication to the first access point 110 of the parameters selected for the downlink transmission of data from the second access point 130 to wireless devices in the second cell 134.
  • the second access point 130 may send the indication of the selected parameters over the interface 140.
  • the first access point 110 may select parameters for downlink transmission of data from the first access point 110 to the wireless device 120 and other wireless devices in the first cell 114 based on the selected parameters for the downlink transmission of data in the second cell 134 and the channel data about the first channel 112 provided by the wireless device 120.
  • the first access point 110 may be configured to send a reference signal to a wireless device in the second cell 134.
  • the second access point 130 may be configured to receive channel data based on the reference signal sent by the first access point 110 to the wireless device in the second cell 134.
  • the second access point 130 may be configured to estimate interference in the second cell 134 from transmission in the first cell 114 based on the channel data and to send the estimated interference to the first access point 110 using or over the interface 140.
  • FIG. 2 illustrates another example wireless communication network 200 ("the network 200"), arranged in accordance with at least one embodiment described herein.
  • the network 200 may include first and second access points 210 and 230 located in first and second cells 214 and 234, respectively.
  • the first and second access points 210 and 230 may be communicatively coupled by an interface 250.
  • the interface 250 may be an X2 interface.
  • FIG. 2 further illustrates first, second, third, fourth, fifth, and sixth first cell wireless devices 220a, 220b, 220c, 220d, 220e, and 220f, referred to collectively as the first cell wireless devices 220, located in the first cell 214.
  • the first cell wireless devices 220 may be in communication with and receive wireless communication services from the first access point 210.
  • the first access point 210 may be configured to send reference signals to the first cell wireless devices 220. Based on the reference signals, the first cell wireless devices 220 may be configured to generate channel data about the channels, e.g., signal paths, between the first cell wireless devices 220 and the first access point 210 and to send the channel data to the first access point 210.
  • the first access point 210 may be configured to determine downlink parameters for sending downlink signals to the first cell wireless devices 220 based on the channel data from the first cell wireless devices 220.
  • FIG. 2 further illustrates first and second second cell wireless devices 240a and 240b, referred to collectively as the second cell wireless devices 240, located in the second cell 234.
  • the second cell wireless devices 240 may be in communication with and receive wireless communication services from the second access point 230.
  • the second access point 230 may be configured to send a reference signal to the second cell wireless devices 240. Based on the reference signal, the second cell wireless devices 240 may be configured to generate channel data about the channels, e.g., signal paths, between the second cell wireless devices 240 and the second access point 230 and to send the channel data to the second access point 230.
  • the second access point 230 may be configured to determine downlink parameters for sending downlink signals to the second cell wireless devices 240 based on the channel data from the second cell wireless devices 240.
  • the second access point 230 may also be configured to send a reference signal to the first cell wireless devices 220.
  • the first cell wireless devices 220 may each be configured to characterize the channels between the second access point 230 and the first cell wireless devices 220 using the reference signal to generate channel data.
  • the channel data from each of the first cell wireless devices 220 may include precoding data and channel quality data.
  • Each of the first cell wireless devices 220 may send the channel data based on the reference signal from the second access point 230 to the first access point 210.
  • the first access point 210 may be configured to estimate the interference in the first cell 214 due to transmissions from the second cell 234 based on the channel data from the first cell wireless devices 220.
  • the first access point 210 may be configured to estimate the interference in the first cell 214 due to downlink transmissions by the second access point 230 based on the channel data from the first cell wireless devices 220.
  • the first access point 210 may send the estimated interference to the second access point 230 over the interface 250.
  • the second access point 230 may be configured to select parameters for downlink transmission of data from the second access point 230 to the second cell wireless devices 240 based on the estimated interference.
  • the first access point 210 may be configured to estimate the interference in the first cell 214 due to transmissions in the second cell 234 using the channel quality data provided by each first cell wireless device 220.
  • the estimated interference in the first cell 214 may include, be based on, or be an aggregation of the channel quality data provided by each first cell wireless device 220.
  • the first access point 210 may be further configured to estimate the interference for each value of the precoding data provided by the first cell wireless devices 220.
  • precoding data may include precoding matrix data and the precoding data value may include a precoding matrix indicator.
  • the first access point 210 may determine the first cell wireless devices 220 with the same precoding data values. The first access point 210 may then determine the interference for the different precoding data values based on the channel quality data for the first cell wireless devices 220 with the same precoding data values. In some embodiments, the first access point 210 may determine the interference for the different precoding data values by aggregating the channel quality data for the first cell wireless devices 220 with the same precoding data values.
  • the first, second, and third first cell wireless devices 220a, 220b, and 220c may provide precoding data that has a value of 1.
  • the fourth and fifth first cell wireless devices 220d and 220e may provide precoding data that has a value of 2 and the sixth first cell wireless device 220f may provide precoding data that has a value of 3.
  • the first access point 210 may be configured to determine the interference for precoding data of a value of 1 based on the channel quality data of the first, second, and third first cell wireless devices 220a, 220b, and 220c.
  • the first access point 210 may determine the interference for precoding data of a value of 2 based on the channel quality data of the fourth and fifth first cell wireless devices 220d and 220e.
  • the first access point 210 may determine the interference for precoding data of a value of 3 based on the channel quality data of the sixth first cell wireless device 220f.
  • the first access point 210 may send the estimated interference for each value of the precoding data provided by the first cell wireless devices 220 to the second access point 230 over the interface 250.
  • the second access point 230 may select parameters for downlink transmission of data from the second access point 230 to the second cell wireless devices 240 based on the estimated interference for each precoding data value provided by the first cell wireless devices 220.
  • the second access point 230 may select precoding data values for downlink transmissions of data that are not the same as or similar to the precoding data values provided by the first cell wireless devices 220.
  • the second access point 230 may select precoding data values for downlink transmissions of data that are not the same as or similar to the precoding data values provided by the first cell wireless devices 220 with interference levels above certain thresholds. Alternately or additionally, the second access point 230 may select how many second cell wireless devices 240 are assigned precoding data values for downlink transmissions of data that are not the same as or similar to the precoding data values provided by the first cell wireless devices 220 based on the interference levels for the precoding data values.
  • the first access point 210 may reduce an amount of data exchanged over the interface 250 between the first and second access points 210 and 230 as compared to the channel data or other data of all of the first cell wireless devices 220 being exchanged over the interface 250 between the first and second access points 210 and 230. Furthermore, by sending estimated interference for the entire first cell 214 or estimated interference for each precoding data value provided by the first cell wireless devices 220, the data rates may be slower along the interface 250 and/or delays along the interface 250 may be longer than when the channel data or other data of all of the first cell wireless devices 220 is exchanged over the interface 250.
  • the first access point 210 may be configured to send a reference signal to the second cell wireless devices 240 in the second cell 234.
  • the second access point 230 may be configured to receive channel data based on the reference signal sent by the first access point 210 from the second cell wireless devices 240.
  • the second access point 230 may be configured to estimate interference in the second cell 234 from transmissions originating in the first cell 214, such as transmissions by the first access point 210, based on the channel data and to send the estimated interference to the first access point 210 using or over the interface 250.
  • FIG. 3 is an example wireless device 300 that may operate in a wireless communication network, arranged in accordance with at least one embodiment described herein.
  • the wireless communication network may include the network 100 or the network 200 of Figure 1 or 2, for instance.
  • the wireless device 300 may include an antenna system 310, a channel data module 320, a database 330, a processor 340, and a memory 350.
  • the antenna system 310 may include one or more antennas configured for a single input single output configuration, a multiple input single output configuration, a single input multiple output configuration, and/or a multiple input multiple output configuration.
  • the antenna system 310 may be configured to receive downlink signals from one or more access points and to transmit uplink signals to one or more access points.
  • the antenna system 310 may be configured to receive reference signals from multiple access points.
  • the antenna system 310 may send the reference signal to the channel data module 320.
  • the term reference signal as used with respect to FIG. 3 may refer to data to be transmitted between two components of a wireless communication system.
  • the reference signal may be an electrical reference signal or a wireless reference signal depending on the context of its usage.
  • the channel data module 320 may be configured to receive the reference signal from the antenna system 310.
  • the channel data module 320 may be configured to use the reference signal to determine channel data with respect to the wireless path traversed by the reference signal.
  • the channel data may be determined by the channel data module 320 using information from the database 330.
  • the database 330 may include a precoding codebook that includes precoding indexes that relate to precoding matrices.
  • the channel data module 320 may determine a precoding value, e.g., a precoding index, for the channel data based on the reference signal and the precoding codebook stored in the database 330.
  • the channel data module 320 may be hardware configured to determine the channel data. Alternately or additionally, the channel data module 320 may be a combination of hardware and software or just software configured to determine the channel data. In these and other embodiments, the channel data module 320 may use the processor 340 and the memory 350 to help determine the channel data.
  • the processor 340 may include, for example, a microprocessor, a microcontroller, a digital signal processor (DSP), an application- specific integrated circuit (ASIC), a Field-Programmable Gate Array (FPGA), or any other digital or analog circuitry configured to interpret and/or to execute program instructions and/or to process data.
  • the processor 340 may interpret and/or execute program instructions and/or process data stored in the memory 350.
  • the channel data module 320 may include program instructions loaded into the memory and interpreted and/or executed by the processor 340.
  • the memory 350 is an example of computer-readable media that may be included in the wireless device 300 and that may generally be configured to retain program instructions and/or data for at least some period of time. More generally, the wireless device 300 may include any suitable computer-readable media instead of or in addition to the memory 350.
  • such computer-readable media may include tangible and/or non-transitory computer-readable storage media including Random Access Memory (RAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM) or other optical disk storage, magnetic disk storage or other magnetic storage devices, flash memory devices (e.g., solid-state memory devices), or any other tangible and/or non-transitory storage medium which may be used to carry or store desired program code in the form of computer-executable instructions or data structures and which may be accessed by a general-purpose or special-purpose computer. Combinations of the above may also be included within the scope of computer-readable media.
  • Computer-executable instructions may include, for example, instructions and data that cause a general-purpose computer, special-purpose computer, or special-purpose processing device to perform a certain function or group of functions.
  • the wireless device 300 may be configured to receive a first reference signal, such as an N-ZP-CSI-RS, from a first access point in the same cell as the wireless device 300 using a first resource.
  • a first reference signal such as an N-ZP-CSI-RS
  • the channel data module 320 may determine first channel data.
  • the channel data module 320 may determine a first channel matrix Hi that describes the wireless path traversed by the first reference signal. Based on the first channel matrix Hi, the channel data module 320 may determine a first precoding code word Wi and a precoding matrix indicator (PMI) for the precoding code word W ⁇ .
  • PMI precoding matrix indicator
  • the channel data module 320 may also determine noise No in the area surrounding the wireless device 300.
  • the wireless device 300 may be further configured to determine first channel quality information CQIi based on the first reference signal.
  • the first channel quality information may be determined using the following equation:
  • the wireless device 300 may be configured to report the first channel data to the first access point.
  • the first channel data may include the first channel matrix Hi, the first precoding code word Wi, the noise No, the first channel quality information CQIi, among other data.
  • the first channel data may include a PMI, a first channel quality indicator based on the first channel quality information CQIi, among other data, such as a rank indicator (RI).
  • the wireless device 300 may also be configured to receive a second reference signal, such as an N-ZP-CSI-RS, from a second access point in a different cell than the wireless device 300 using a second resource that is orthogonal to the first resource.
  • a second reference signal such as an N-ZP-CSI-RS
  • the channel data module 320 may determine second channel data.
  • the channel data module 320 may determine a second channel matrix H 2 that describes the wireless path traversed by the second reference signal. Based on the second channel matrix H 2 , the channel data module 320 may determine a second precoding code word W 2 and a precoding matrix indicator (PMI) for the precoding code word W 2 .
  • the wireless device 300 may be further configured to determine second channel quality information CQI 2 based on the second reference signal.
  • the second channel quality information may be determined using the following equation:
  • the wireless device 300 may be configured to report the second channel data to the first access point.
  • the second channel data may include the second channel matrix H 2 , the second precoding code word W 2, the noise No, the second channel quality information CQI 2 , among other data.
  • the second channel data may include a PMI, a second channel quality indicator based on the second channel quality information CQI 2 , among other data, such as a rank indicator (RI).
  • RI rank indicator
  • the wireless device 300 may not send the rank indicator for the second reference signal because the rank indicator may be assumed to be one.
  • the second channel quality information CQI 2 may represent the interference from the second access point that the wireless device 300 experiences when the second access point transmits a downlink signal using the second precoding code word W 2 in the same resource as a downlink signal sent to the wireless device 300 from the first access point.
  • the channel quality information for a channel between the first access point and the wireless device 300 when the first and second access points are transmitting using the same resource and the second access point is transmitting using the second precoding code word W 2 may be represented by the following equation:
  • This equation illustrates that the second channel quality information CQI 2 may be considered interference to the wireless device 300 as the second channel quality information CQI 2 may result in a degradation of a signal-to-noise ratio with respect to the wireless device 300 and thus the signal quality of downlink signals transmitted to the wireless device 300 by the first access point.
  • the wireless device 300 may transmit a channel matrix to an access point and allow the access point to determine the channel data.
  • FIG. 4 illustrates another example wireless communication network 400 ("the network 400"), arranged in accordance with at least one embodiment described herein.
  • the network 400 may include a first access point 410 and a second access point 460.
  • the first and second access points 410 and 460 may be communicatively coupled by an interface 450.
  • the first access point 410 may include an antenna system 412, an interference module 420, a transmission module 422, a database 430, a processor 440, and a memory 442.
  • the second access point 460 may include an antenna system 462, a transmission module 470, a database 480, a processor 490, and a memory 492.
  • the antenna systems 412 and 462 may each include one or more antennas configured for a single input single output configuration, a multiple input single output configuration, a single input multiple output configuration, or a multiple input multiple output configuration.
  • the antenna systems 412 and 462 may each be configured to receive uplink signals from one or more wireless devices and to transmit downlinks signals to one or more wireless devices.
  • the transmission modules 422 and 470 may be configured to determine parameters for sending downlink signals to wireless devices.
  • the downlink signals may be reference signals or data signals.
  • the transmission modules 422 and 470 may use information from the databases 430 and 480, respectively, to determine the parameters for sending downlink signals to wireless devices.
  • the interference module 420 may be configured to estimate interference to wireless devices in a first cell, where the first access point 410 is located, resulting from transmissions originating in a second cell where the second access point 460 is located.
  • the interference module 420 may determine the interference using channel data from wireless devices in the first cell, where the channel data is based on reference signals transmitted by the second access point 460.
  • the interference module 420 may transmit the estimated interference to the second access point 460 using or over the interface 450.
  • the transmission modules 422 and 470 and the interference module 420 may be hardware configured to perform their operations. Alternately or additionally, the transmission modules 422 and 470 and the interference module 420 may include hardware, a combination of hardware and software, or just software configured to perform their respective operations. In these and other embodiments, the transmission modules 422 and 470 and the interference module 420 may use the processor 440 and the memory 442 and the transmission module 470 may use the processor 490 and the memory 492 to perform their operations.
  • the processors 440 and 490 and the memories 442 and 492 may be configured similar to the processor 340 and the memory 350, respectively, of FIG. 3 and no further detail is thus provided with respect to FIG. 4.
  • the transmission module 470 may configure a reference signal, such as an N-ZP-CSI-RS and the antenna system 462 of the second access point 460 may transmit the reference signal to multiple first wireless devices in the first cell, in which the first access point 410 is located.
  • a reference signal such as an N-ZP-CSI-RS
  • the antenna system 462 of the second access point 460 may transmit the reference signal to multiple first wireless devices in the first cell, in which the first access point 410 is located.
  • the first wireless devices may use the reference signal to determine channel data with respect to wireless paths between the second access point 460 and the first wireless devices.
  • the channel data determined by each of the first wireless devices may include precoding data, such as a PMI, and channel quality data, such as channel quality indicators that indicate a value for channel quality.
  • Each first wireless device may send the channel data to the first access point 410.
  • the interference module 420 may receive the channel data from the first wireless devices.
  • the interference module 420 may determine an interference level for each PMI determined by the first wireless devices by summing the channel quality values indicated by the channel quality indicators that are provided by the first wireless devices that provide the same PMIs. For example, the interference module 420 may sum the channel quality values indicated by the channel quality indicators from multiple first wireless devices that provide a first PMI for the interference level for the first PMI and sum the channel quality values indicated by the channel quality indicators from multiple first wireless devices that provide a second PMI for the interference level for the second PMI.
  • the interference module 420 may send, as interference data, an indication of the PMIs indicated by the first wireless devices and the corresponding interference levels for each PMI to the transmission module 470 of the second access point 460 using or over the interface 450.
  • the interference data may represent the total interference experienced by the first wireless devices in the first cell due to downlink transmission by the second access point 460.
  • the transmission module 470 may set the parameters for transmitting downlink signals to second wireless devices in the second cell, in which the second access point 460 is located, using the interference data. For example, the transmission module 470 may avoid using the precoding codewords associated with the PMIs in the interference data that are associated with interference levels above a threshold. The threshold may be determined based on signal-noise-level ratios that may be tolerated by the first wireless devices. After determining precoding codewords for downlink transmissions, the transmission module 470 may send the determined precoding codewords to the transmission module 422 of the first access point 410. The transmission module 422 may determine precoding codewords for downlink transmission to the first wireless devices from the first access point 410 based on the determined precoding codewords received from the second access point 460.
  • the second access point 460 may include an interference module analogous to the interference module 420 of the first access point 410.
  • FIG. 5 is a flowchart of an example method 500 of configuring wireless network communications, arranged in accordance with at least one embodiment described herein.
  • the method 500 may be implemented, in some embodiments, by a wireless communication network, such as the networks 100, 200, and 400 of FIGS. 1, 2, and 4, respectively.
  • a wireless communication network such as the networks 100, 200, and 400 of FIGS. 1, 2, and 4, respectively.
  • the method 500 may begin at block 502, where a reference signal from a first access point in a first cell may be transmitted to a wireless device in a second cell.
  • the wireless device may be associated with a second access point in the second cell.
  • the reference signal may include a non-zero power channel information reference signal, a zero-power channel information reference signal, or some other type of reference signal.
  • channel data may be received at the second access point from the wireless device.
  • the channel data may be generated by the wireless device based on the reference signal received by the wireless device.
  • interference in the second cell due to transmissions originating in the first cell may be estimated based on the received channel data.
  • the method 500 may further include sending the estimated interference to the first access point.
  • the method 500 may further include selecting parameters for downlink transmission of data from the first access point to a wireless device in the first cell based on the estimated interference.
  • the method 500 may further include sending the selected parameters for the downlink transmission of data in the first cell from the first access point to the second access point.
  • the method 500 may include selecting parameters for downlink transmission of data from the second access point to the wireless device in the second cell based on the selected parameters for the downlink transmission of data in the first cell.
  • the parameters for the downlink transmission of data may include one or more of: when the downlink transmission occurs (e.g., specific time resources), precoding data for the downlink transmission, a power level for the downlink transmission, or frequencies for the downlink transmission (e.g., specific frequency resources), among other parameters.
  • the wireless device is one of multiple wireless devices that each receive the first reference signal from the first reference point.
  • the method further includes receiving, at the second access point, channel data from each of the multiple wireless devices.
  • the channel data from each of the multiple wireless devices may be based on the first reference signal.
  • the interference in the second cell may be estimated based on the channel data from the multiple wireless devices.
  • the estimated interference in the second cell may be a total estimated interference and the channel data from each of the multiple wireless devices may include precoding data or channel quality data, among other data.
  • the method 500 may further include estimating an interference level in the second cell for each value of the precoding data provided by the multiple wireless devices. The total estimated interference may be based on the estimated interference levels.
  • the estimated interference level for each value of the precoding data may be based on the channel quality data from wireless devices of the multiple wireless devices that provide precoding data with the same value.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de configuration des communications de réseau sans fil, ledit procédé pouvant consister à transmettre un signal de référence depuis un premier point d'accès dans une première cellule à un dispositif sans fil dans une seconde cellule. Le dispositif sans fil peut également être associé à un second point d'accès dans la seconde cellule. Le procédé peut en outre consister à recevoir, au niveau du second point d'accès, des données de canal provenant du dispositif sans fil. Les données de canal peuvent être générées par le dispositif sans fil sur la base du signal de référence reçu par le dispositif sans fil. Le procédé peut en outre consister à estimer, sur la base des données de canal reçues, des interférences dans la seconde cellule dues aux transmissions provenant de la première cellule.
PCT/US2014/023732 2013-10-04 2014-03-11 Configuration de communications de réseau sans fil WO2015050578A2 (fr)

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US201361886971P 2013-10-04 2013-10-04
US61/886,971 2013-10-04

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US20220376953A1 (en) * 2019-10-03 2022-11-24 Telefonaktiebolaget Lm Ericsson (Publ) Reception and decoding of data in a radio network

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US7512379B2 (en) * 2004-10-29 2009-03-31 Hien Nguyen Wireless access point (AP) automatic channel selection
US8194587B2 (en) * 2006-11-09 2012-06-05 Broadcom Corporation Adaptive network supporting single to concurrent interfering wireless transmissions
US8391796B2 (en) * 2008-09-30 2013-03-05 SpiderCloud Wirless, Inc. Identifying and controlling interference from wireless terminals
KR101715939B1 (ko) * 2009-06-18 2017-03-14 엘지전자 주식회사 채널 상태 정보 피드백 방법 및 장치
US8537911B2 (en) * 2011-02-21 2013-09-17 Motorola Mobility Llc Method and apparatus for reference signal processing in an orthogonal frequency division multiplexing communication system
ES2426164T3 (es) * 2011-04-21 2013-10-21 Ntt Docomo, Inc. Procedimiento y aparato para determinar un vector de precodificación para precodificar datos que van a ser transmitidos a un dispositivo inalámbrico en un sistema de comunicación inalámbrica

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Publication number Priority date Publication date Assignee Title
US20220376953A1 (en) * 2019-10-03 2022-11-24 Telefonaktiebolaget Lm Ericsson (Publ) Reception and decoding of data in a radio network

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