WO2012148896A2 - Point de regroupement de données (dap) en tant que point de coordination à entrées multiples et à sorties multiples (mimo) - Google Patents

Point de regroupement de données (dap) en tant que point de coordination à entrées multiples et à sorties multiples (mimo) Download PDF

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Publication number
WO2012148896A2
WO2012148896A2 PCT/US2012/034767 US2012034767W WO2012148896A2 WO 2012148896 A2 WO2012148896 A2 WO 2012148896A2 US 2012034767 W US2012034767 W US 2012034767W WO 2012148896 A2 WO2012148896 A2 WO 2012148896A2
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Prior art keywords
data
dap
wtrus
transmit
time
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PCT/US2012/034767
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English (en)
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WO2012148896A3 (fr
Inventor
Ronald G. Murias
Lei Wang
Yingxue K. Li
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Interdigital Patent Holdings, Inc.
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Publication of WO2012148896A2 publication Critical patent/WO2012148896A2/fr
Publication of WO2012148896A3 publication Critical patent/WO2012148896A3/fr

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Classifications

    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0076—Distributed coding, e.g. network coding, involving channel coding
    • H04L1/0077—Cooperative coding
    • 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
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • 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
    • H04L2001/0093—Point-to-multipoint
    • 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
    • H04L2001/0097—Relays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]

Definitions

  • This application is related to wireless communications.
  • Machine type communication is a form of data communication that includes one or more entities that do not necessarily need human interaction.
  • a service optimized for MTC may differ from a service optimized for Human to Human communications and may differ from current mobile network communication services in that it may involve different market scenarios, data communications, lower costs and effort, a potentially very large number of communicating terminals with, to a large extent, little traffic per terminal.
  • Examples of MTC devices include metering devices and tracking devices.
  • Categories of features that have been defined for MTC, each of them bringing different design challenges, may include time controlled access, time tolerant, packet switched (PS) only, online small data transmissions, offline small data transmissions, mobile originated only, infrequent mobile terminated, MTC monitoring, offline indication, jamming indication, priority alarm message (PAM), extra low power consumption, secure connection, location specific trigger, and group based MTC features including group based policing and group based addressing.
  • PS packet switched
  • a method for multiple -input multiple -output (MIMO) communications between wireless transmit and receive units includes receiving, at a aggregate point (DAP), data from a plurality of wireless transmit/receive units (WTRUs), aggregating, at the DAP, the data received from the plurality of WTRUs to provide an aggregate signal, transmitting the aggregate signal to at least two of the plurality of WTRUs for re-transmission, and determining a coding scheme for re-transmission of the data by the at least two of the plurality of WTRUs.
  • DAP aggregate point
  • WTRUs wireless transmit/receive units
  • FIG. 1A is a system diagram of an example communications system in which one or more disclosed embodiments may be implemented
  • FIG. IB is a system diagram of an example wireless transmit/receive unit (WTRU) that may be used within the communications system illustrated in FIG. 1A;
  • WTRU wireless transmit/receive unit
  • FIG. 1C is a system diagram of an example radio access network and an example core network that may be used within the communications system illustrated in FIG. 1A;
  • FIG. 2 is a signal diagram illustrating example communications for a method of uplink (UL) multiple -input multiple -output (MIMO);
  • FIG. 3 is a block diagram illustrating a step in the method of UL
  • FIG. 4 is a block diagram illustrating another step in the method of
  • FIG. 5 is a block diagram illustrating another step in the method of
  • FIG. 6 is a block diagram illustrating a method of downlink (DL)
  • FIG. 7 is a block diagram illustrating a step in the method of DL
  • FIG. 8 is a block diagram illustrating another step in the method of
  • FIG. 9 is a block diagram illustrating another step in the method of
  • FIG. 10 is a signal diagram illustrating example communications for a method of MIMO that may be applied to multiple layers of aggregation.
  • the DAP may provide an uplink (UL) and downlink (DL) service for local MTC devices, saving power and reducing overhead associated with network entry and packet overhead.
  • Also of concern may be the potential for a large number of devices active in a given area, which may result in a heavy load on ranging and network access resources, while each MTC device may only have a small amount of data to transmit.
  • MTC devices may be small and limited in power (e.g., due to size and available power supplies).
  • a DAP may be used to aggregate the UL and/or DL data for multiple MTC devices.
  • An example use case for a DAP may be to have the local MTC devices connect (e.g., by radio or by wire) to the DAP and upload data. The DAP may then transmit aggregated data to the network base station.
  • this scenario does not exploit the spatial diversity of the MTC devices local to a DAP.
  • Multi-user MIMO may enhance range while reducing interference.
  • multiple MTC devices may transmit precoded MIMO streams to a base station.
  • the DAP may aggregate and apply precoding to the data and pass precoded MIMO streams back to several MTC devices capable of coordinated transmission to the base station.
  • the DAP may pass precoder information to MTC devices along with unprecoded data.
  • MTC devices may generate the precoded data stream on its own.
  • FIG. 1A is a diagram of an example communications system 100 in which one or more disclosed embodiments may be implemented.
  • the communications system 100 may be a multiple access system that provides content, such as voice, data, video, messaging, broadcast, etc., to multiple wireless users.
  • the communications system 100 may enable multiple wireless users to access such content through the sharing of system resources, including wireless bandwidth.
  • the communications systems 100 may employ one or more channel access methods, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), single-carrier FDMA (SC-FDMA), and the like.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal FDMA
  • SC-FDMA single-carrier FDMA
  • the communications system 100 may include wireless transmit/receive units (WTRUs) 102a, 102b, 102c, 102d, a radio access network (RAN) 104, a core network 106, a public switched telephone network (PSTN) 108, the Internet 110, and other networks 112, though it will be appreciated that the disclosed embodiments contemplate any number of WTRUs, base stations, networks, and/or network elements.
  • WTRUs 102a, 102b, 102c, 102d may be any type of device configured to operate and/or communicate in a wireless environment.
  • the WTRUs 102a, 102b, 102c, 102d may be configured to transmit and/or receive wireless signals and may include user equipment (UE), a mobile station, a fixed or mobile subscriber unit, a pager, a cellular telephone, a personal digital assistant (PDA), a smartphone, a laptop, a netbook, a personal computer, a wireless sensor, consumer electronics, and the like.
  • UE user equipment
  • PDA personal digital assistant
  • smartphone a laptop
  • netbook a personal computer
  • a wireless sensor consumer electronics, and the like.
  • the communications systems 100 may also include a base station
  • Each of the base stations 114a, 114b may be any type of device configured to wirelessly interface with at least one of the WTRUs 102a, 102b, 102c, 102d to facilitate access to one or more communication networks, such as the core network 106, the Internet 110, and/or the networks 112.
  • the base stations 114a, 114b may be a base transceiver station (BTS), a Node-B, an eNode B, a Home Node B, a Home eNode B, a site controller, an access point (AP), a wireless router, and the like. While the base stations 114a, 114b are each depicted as a single element, it will be appreciated that the base stations 114a, 114b may include any number of interconnected base stations and/or network elements.
  • the base station 114a may be part of the RAN 104, which may also include other base stations and/or network elements (not shown), such as a base station controller (BSC), a radio network controller (RNC), relay nodes, etc.
  • BSC base station controller
  • RNC radio network controller
  • the base station 114a and/or the base station 114b may be configured to transmit and/or receive wireless signals within a particular geographic region, which may be referred to as a cell (not shown).
  • the cell may further be divided into cell sectors.
  • the cell associated with the base station 114a may be divided into three sectors.
  • the base station 114a may include three transceivers, i.e., one for each sector of the cell.
  • the base station 114a may employ multiple-input multiple output (MIMO) technology and, therefore, may utilize multiple transceivers for each sector of the cell.
  • MIMO multiple-input multiple output
  • the base stations 114a, 114b may communicate with one or more of the WTRUs 102a, 102b, 102c, 102d over an air interface 116, which may be any suitable wireless communication link (e.g., radio frequency (RF), microwave, infrared (IR), ultraviolet (UV), visible light, etc.).
  • RF radio frequency
  • IR infrared
  • UV ultraviolet
  • the air interface 116 may be established using any suitable radio access technology (RAT).
  • RAT radio access technology
  • the communications system 100 may be a multiple access system and may employ one or more channel access schemes, such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, and the like.
  • the base station 114a in the RAN 104 and the WTRUs 102a, 102b, 102c may implement a radio technology such as Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access (UTRA), which may establish the air interface 116 using wideband CDMA (WCDMA).
  • WCDMA may include communication protocols such as High-Speed Packet Access (HSPA) and/or Evolved HSPA (HSPA+).
  • HSPA may include High-Speed Downlink Packet Access (HSDPA) and/or High-Speed Uplink Packet Access (HSUPA).
  • the base station 114a and the WTRUs 102a are identical to the base station 114a and the WTRUs 102a.
  • E-UTRA Evolved UMTS Terrestrial Radio Access
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • the base station 114a and the WTRUs 102a are identical to the base station 114a and the WTRUs 102a.
  • 102b, 102c may implement radio technologies such as IEEE 802.16 (i.e., Worldwide Interoperability for Microwave Access (WiMAX)), CDMA2000, CDMA2000 IX, CDMA2000 EV-DO, Interim Standard 2000 (IS-2000), Interim Standard 95 (IS-95), Interim Standard 856 (IS-856), Global System for Mobile communications (GSM), Enhanced Data rates for GSM Evolution (EDGE), GSM EDGE (GERAN), and the like.
  • IEEE 802.16 i.e., Worldwide Interoperability for Microwave Access (WiMAX)
  • CDMA2000, CDMA2000 IX, CDMA2000 EV-DO Code Division Multiple Access 2000
  • IS-95 IS-95
  • IS-856 Interim Standard 856
  • GSM Global System for Mobile communications
  • GSM Global System for Mobile communications
  • EDGE Enhanced Data rates for GSM Evolution
  • GERAN GSM EDGERAN
  • the base station 114b in FIG. 1A may be a wireless router, Home
  • Node B, Home eNode B, or access point may utilize any suitable RAT for facilitating wireless connectivity in a localized area, such as a place of business, a home, a vehicle, a campus, and the like.
  • the base station 114b and the WTRUs 102c, 102d may implement a radio technology such as IEEE 802.11 to establish a wireless local area network (WLAN).
  • the base station 114b and the WTRUs 102c, 102d may implement a radio technology such as IEEE 802.15 to establish a wireless personal area network (WPAN).
  • WLAN wireless local area network
  • WPAN wireless personal area network
  • the base station 114b and the WTRUs 102c, 102d may utilize a cellular-based RAT (e.g., WCDMA, CDMA2000, GSM, LTE, LTE-A, etc.) to establish a picocell or femtocell.
  • a cellular-based RAT e.g., WCDMA, CDMA2000, GSM, LTE, LTE-A, etc.
  • the base station 114b may have a direct connection to the Internet 110.
  • the base station 114b may not be required to access the Internet 110 via the core network 106.
  • the RAN 104 may be in communication with the core network 106, which may be any type of network configured to provide voice, data, applications, and/or voice over internet protocol (VoIP) services to one or more of the WTRUs 102a, 102b, 102c, 102d.
  • the core network 106 may provide call control, billing services, mobile location-based services, pre-paid calling, Internet connectivity, video distribution, etc., and/or perform high-level security functions, such as user authentication.
  • the RAN 104 and/or the core network 106 may be in direct or indirect communication with other RANs that employ the same RAT as the RAN 104 or a different RAT.
  • the core network 106 may also be in communication with another RAN (not shown) employing a GSM radio technology.
  • the core network 106 may also serve as a gateway for the WTRUs
  • the PSTN 108 may include circuit-switched telephone networks that provide plain old telephone service (POTS).
  • POTS plain old telephone service
  • the Internet 110 may include a global system of interconnected computer networks and devices that use common communication protocols, such as the transmission control protocol (TCP), user datagram protocol (UDP) and the internet protocol (IP) in the TCP/IP internet protocol suite.
  • the networks 112 may include wired or wireless communications networks owned and/or operated by other service providers.
  • the networks 112 may include another core network connected to one or more RANs, which may employ the same RAT as the RAN 104 or a different RAT.
  • Some or all of the WTRUs 102a, 102b, 102c, 102d in the communications system 100 may include multi-mode capabilities, i.e., the WTRUs 102a, 102b, 102c, 102d may include multiple transceivers for communicating with different wireless networks over different wireless links.
  • the WTRU 102c shown in FIG. 1A may be configured to communicate with the base station 114a, which may employ a cellular-based radio technology, and with the base station 114b, which may employ an IEEE 802 radio technology.
  • FIG. IB is a system diagram of an example WTRU 102.
  • the WTRU 102 may include a processor 118, a transceiver 120, a transmit/receive element 122, a speaker/microphone 124, a keypad 126, a display/touchpad 128, non-removable memory 106, removable memory 132, a power source 134, a global positioning system (GPS) chipset 136, and other peripherals 138.
  • GPS global positioning system
  • the processor 118 may be a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Array (FPGAs) circuits, any other type of integrated circuit (IC), a state machine, and the like.
  • the processor 118 may perform signal coding, data processing, power control, input/output processing, and/or any other functionality that enables the WTRU 102 to operate in a wireless environment.
  • the processor 118 may be coupled to the transceiver 120, which may be coupled to the transmit/receive element 122.
  • the transmit/receive element 122 may be configured to transmit signals to, or receive signals from, a base station (e.g., the base station 114a) over the air interface 116.
  • a base station e.g., the base station 114a
  • the transmit/receive element 122 may be an antenna configured to transmit and/or receive RF signals.
  • the transmit/receive element 122 may be an emitter/detector configured to transmit and/or receive IR, UV, or visible light signals, for example.
  • the transmit/receive element 122 may be configured to transmit and receive both RF and light signals. It will be appreciated that the transmit/receive element 122 may be configured to transmit and/or receive any combination of wireless signals.
  • the WTRU 102 may include any number of transmit/receive elements 122. More specifically, the WTRU 102 may employ MIMO technology. Thus, in one embodiment, the WTRU 102 may include two or more transmit/receive elements 122 (e.g., multiple antennas) for transmitting and receiving wireless signals over the air interface 116.
  • the WTRU 102 may include two or more transmit/receive elements 122 (e.g., multiple antennas) for transmitting and receiving wireless signals over the air interface 116.
  • the transceiver 120 may be configured to modulate the signals that are to be transmitted by the transmit/receive element 122 and to demodulate the signals that are received by the transmit/receive element 122.
  • the WTRU 102 may have multi-mode capabilities.
  • the transceiver 120 may include multiple transceivers for enabling the WTRU 102 to communicate via multiple RATs, such as UTRA and IEEE 802.11, for example.
  • the processor 118 of the WTRU 102 may be coupled to, and may receive user input data from, the speaker/microphone 124, the keypad 126, and/or the display/touchpad 128 (e.g., a liquid crystal display (LCD) display unit or organic light-emitting diode (OLED) display unit).
  • the processor 118 may also output user data to the speaker/microphone 124, the keypad 126, and/or the display/touchpad 128.
  • the processor 118 may access information from, and store data in, any type of suitable memory, such as the non-removable memory 106 and/or the removable memory 132.
  • the non-removable memory 106 may include random-access memory (RAM), read-only memory (ROM), a hard disk, or any other type of memory storage device.
  • the removable memory 132 may include a subscriber identity module (SIM) card, a memory stick, a secure digital (SD) memory card, and the like.
  • SIM subscriber identity module
  • SD secure digital
  • the processor 118 may access information from, and store data in, memory that is not physically located on the WTRU 102, such as on a server or a home computer (not shown).
  • the processor 118 may receive power from the power source 134, and may be configured to distribute and/or control the power to the other components in the WTRU 102.
  • the power source 134 may be any suitable device for powering the WTRU 102.
  • the power source 134 may include one or more dry cell batteries (e.g., nickel-cadmium (NiCd), nickel-zinc (NiZn), nickel metal hydride (NiMH), lithium-ion (Li-ion), etc.), solar cells, fuel cells, and the like.
  • the processor 118 may also be coupled to the GPS chipset 136, which may be configured to provide location information (e.g., longitude and latitude) regarding the current location of the WTRU 102.
  • location information e.g., longitude and latitude
  • the WTRU 102 may receive location information over the air interface 116 from a base station (e.g., base stations 114a, 114b) and/or determine its location based on the timing of the signals being received from two or more nearby base stations. It will be appreciated that the WTRU 102 may acquire location information by way of any suitable location- determination method while remaining consistent with an embodiment.
  • the processor 118 may further be coupled to other peripherals 138, which may include one or more software and/or hardware modules that provide additional features, functionality and/or wired or wireless connectivity.
  • the peripherals 138 may include an accelerometer, an e-compass, a satellite transceiver, a digital camera (for photographs or video), a universal serial bus (USB) port, a vibration device, a television transceiver, a hands free headset, a Bluetooth® module, a frequency modulated (FM) radio unit, a digital music player, a media player, a video game player module, an Internet browser, and the like.
  • FIG. 1C is a system diagram of the RAN 104 and the core network
  • the RAN 104 may employ a UTRA radio technology to communicate with the WTRUs 102a, 102b, 102c over the air interface 116.
  • the RAN 104 may also be in communication with the core network 106.
  • the RAN 104 may include Node-Bs 140a, 140b, 140c, which may each include one or more transceivers for communicating with the WTRUs 102a, 102b, 102c over the air interface 116.
  • the Node-Bs 140a, 140b, 140c may each be associated with a particular cell (not shown) within the RAN 104.
  • the RAN 104 may also include RNCs 142a, 142b. It will be appreciated that the RAN 104 may include any number of Node-Bs and RNCs while remaining consistent with an embodiment.
  • the Node-Bs 140a, 140b may be in communication with the RNC 142a. Additionally, the Node-B 140c may be in communication with the RNCl42b. The Node-Bs 140a, 140b, 140c may communicate with the respective RNCs 142a, 142b via an Iub interface. The RNCs 142a, 142b may be in communication with one another via an Iur interface. Each of the RNCs 142a, 142b may be configured to control the respective Node- Bs 140a, 140b, 140c to which it is connected. In addition, each of the RNCs 142a, 142b may be configured to carry out or support other functionality, such as outer loop power control, load control, admission control, packet scheduling, handover control, macrodiversity, security functions, data encryption, and the like.
  • outer loop power control such as outer loop power control, load control, admission control, packet scheduling, handover control, macrodiversity, security functions, data encryption, and the like.
  • the core network 106 shown in FIG. 1C may include a media gateway (MGW) 144, a mobile switching center (MSC) 146, a serving GPRS support node (SGSN) 148, and/or a gateway GPRS support node (GGSN) 150. While each of the foregoing elements are depicted as part of the core network 106, it will be appreciated that any one of these elements may be owned and/or operated by an entity other than the core network operator.
  • MGW media gateway
  • MSC mobile switching center
  • SGSN serving GPRS support node
  • GGSN gateway GPRS support node
  • the RNC 142a in the RAN 104 may be connected to the MSC 146 in the core network 106 via an IuCS interface.
  • the MSC 146 may be connected to the MGW 144.
  • the MSC 146 and the MGW 144 may provide the WTRUs 102a, 102b, 102c with access to circuit-switched networks, such as the PSTN 108, to facilitate communications between the WTRUs 102a, 102b, 102c and traditional land-line communications devices.
  • the RNC 142a in the RAN 104 may also be connected to the SGSN
  • the SGSN 148 may be connected to the GGSN 150.
  • the SGSN 148 and the GGSN 150 may provide the WTRUs 102a, 102b, 102c with access to packet- switched networks, such as the Internet 110, to facilitate communications between and the WTRUs 102a, 102b, 102c and IP-enabled devices.
  • the core network 106 may also be connected to the networks 112, which may include other wired or wireless networks that are owned and/or operated by other service providers.
  • FIG. 2 is a signal diagram illustrating example communications for a method of uplink multiple -input multiple -output (MIMO), and FIGs. 3, 4 and 5 are block diagrams illustrating steps in the method.
  • MTC devices e.g., MTC devices 1, 2 and 3 in FIG. 2 and MTC devices 1, 2, 3, 4, 5 and 6 in FIG. 3 using a single radio capable of transmitting directly to the base station transmit a low power signal to the DAP.
  • the DAP may aggregate data and determine an appropriate scheme for a subsequent cooperative transmission.
  • the DAP may choose, for example, closed loop spatial multiplexing, open loop spatial multiplexing, or open loop diversity (e.g., space-time/frequency coding) scheme.
  • the DAP transmits (with low power) aggregated data along with other control information to selected MTC devices (e.g., MTC devices 1 and 2 in FIG. 2 and MTC devices 1 and 6 in FIG. 4).
  • selected MTC devices e.g., MTC devices 1 and 2 in FIG. 2 and MTC devices 1 and 6 in FIG. 4
  • the selected MTC devices process and transmit MIMO signals to the base station at a time or times specified by the DAP.
  • the DAP may transmit precoded data to the MTC devices, or the DAP may transmit non-precoded data along with the precoder information. With the precoder information, the MTC devices may perform precoding operations locally. With the latter method, it may be possible to take advantage of the fact that certain portions of the aggregated data may be known to certain MTC devices. In decoding data at an MTC device, known data may be inserted into a systematic bit sequence and improve decoder performance. Therefore, DAP-to-MTC transmission efficiency may be improved.
  • the DAP may transmit space-time (frequency) coded data to selected MTC devices, or the DAP may choose to transmit original aggregated data to MTC devices to take advantage of known data bits at MTC devices as described above. MTC devices may then perform space-time (frequency) coding locally.
  • the DAP may also decide to use cyclic delay diversity (CDD) in a coordinated transmission, where each MTC device may transmit data at a different time offset specified by the DAP.
  • CDD cyclic delay diversity
  • all aggregated data be available at the selected MTC devices. It may be preferred that all aggregated data bits be coded jointly by a channel encoder (e.g., a Turbo encoder, a convolutional encoder or LPDC encoder).
  • the DAP may also send control information to MTC devices so that MTC devices may locate the bits that were originated from themselves and count them as known bits during a decoding process.
  • each MTC may only need to receive a portion of the aggregated data.
  • the DAP may encode data separately.
  • orthogonal transmission may be used (e.g., FDMA, TDMA or CDMA).
  • the DAP may transmit simultaneously to multiple MTC devices on the same radio resources (MU-MIMO).
  • FIG. 6 is a signal diagram illustrating example communications for a method of downlink multiple-input multiple-output (MIMO), and FIGs. 7, 8 and 9 are block diagrams illustrating steps in the method.
  • a base station may transmit aggregated data that may be heard by selected MTC devices (e.g., MTC devices 1, 2 and 3 in FIG. 6 and MTC devices 1 and 6 in FIG. 7).
  • MTC devices e.g., MTC devices 1, 2 and 3 in FIG. 6 and MTC devices 1 and 6 in FIG. 7
  • MCS modulation and coding scheme
  • each MTC device may relay the received signal to the DAP in a second phase transmission (examples of which are illustrated in FIGs. 6 and 8).
  • the DAP may be able to decode the aggregated data.
  • two different relays may be considered. If all MTC devices relay simultaneously, the relayed signals may be combined in the air when arriving the DAP, resulting in better signal SNR. If relayed signal from M2M devices are not overlapped in either time or frequency, the DAP baseband may observe individual signals relayed by each of the selected MTC devices. Essentially, each MTC device may behave like a distributed antenna of the DAP.
  • More advanced MIMO receivers may then be used to improve downlink reception at the DAP.
  • the DAP may de-aggregate data into smaller packages and transmit the smaller packages to individual receivers (e.g., MTC devices 1, 2 and 3 in FIG. 6 and MTC devices 1, 2, 3, 4, 5 and 6 in FIG. 9).
  • the DAP may simultaneously transmit to multiple MTC devices on a given radio resource block.
  • proper precoder information may be derived according to certain criteria. For example, zero-forcing precoder information may be used.
  • the DAP may use a separate frequency or radio technology for communication with MTC devices, as described below.
  • Each MTC device may be equipped with two radios (e.g., Bluetooth/WiFi and WiMAX) and may transmit UL data to the DAP over the short range (e.g., Bluetooth/WiFi) radio.
  • the DAP may aggregate the data and transmit (e.g., via Bluetooth) the aggregated (precoded or unprecoded) data to select MTC devices.
  • the select MTC devices may then process and transmit the MIMO signals to the base station according to a cooperative MIMO scheme specified by the DAP.
  • capability signaling may be required.
  • M2M device power source e.g., whether it is battery powered
  • MTC device transmitter details e.g., maximum power, antenna gain, etc.
  • MTC devices may periodically measure radio link quality between the MTC device and the base station and report it to the DAP. MTC devices with good link quality to the base station may be more likely to be selected by the DAP to participate in a subsequent coordinated transmission.
  • Data transmissions to the DAP may follow whatever normal procedures currently exist.
  • the MTC devices selected for coordinated transmission may receive data from the DAP and transmit at the appropriate time.
  • the DAP may send a request to the base station asking for a grant for uplink transmission.
  • the DAP may derive the timing information for the coordinated transmission and send it to the selected MTC devices.
  • the DAP may also send a power control command to MTC devices so that they may adjust transmission power accordingly.
  • all transmissions from selected MTC devices should arrive at the base station simultaneously within the (sub)frames specified by the uplink grant.
  • the DAP may direct MTC devices so that their transmitted signals arrive at the base station at slightly different times (e.g., in CDD mode).
  • the DAP may coordinate with the selected MTC devices to request an uplink transmission grant.
  • the selected MTC devices may send UL transmission requests at a time specified by the DAP.
  • the joint transmission between the DAP and the selected MTC devices may improve a signal-to-noise ratio (SNR) observed by the base station, even though the base station may not be aware of the involvement of the MTC devices.
  • SNR signal-to-noise ratio
  • each of the selected MTC devices may monitor the downlink control channel transmitted from the base station for a certain period of time, in order to receive the UL transmission grant.
  • the selected MTC devices may also monitor the downlink control channel from the DAP in order to receive the UL grant forwarded by the DAP.
  • the UL allocations for the DAP coordinated UL MIMO may be addressed to a cooperative set as a group (e.g., the recipient of a UL allocation may be the group identified by a pre-assigned group identification (ID)).
  • ID group identification
  • the stations in the cooperative set may be informed of radio link resources allocated for their UL MIMO transmissions, without any station to relay such UL allocation information.
  • the UL allocations for the DAP coordinated UL MIMO transmissions may be addressed to the DAP or a specific station in the cooperative set, and the recipient of such UL allocations may need to relay the allocation information to other stations in the cooperative set.
  • the offset between the UL allocation Information Element (IE) transmission and the allocated UL resource may be required to be set to be sufficient to accommodate the processing and transmission time for all the stations in the cooperative set to obtain the UL allocation information in time for the cooperative UL MIMO transmissions.
  • Such a requirement may not be able to be met by some existing air interface designs, e.g., 802.16e and 802.16m. Therefore, changes may be needed in the UL allocation mechanisms to provide sufficient offset for the proposed DAP coordinated UL MIMO transmissions.
  • the stations in a cooperative set should be in a proper receiving mode and have the right information to receive and decode the corresponding DL MIMO transmissions.
  • the stations in the cooperative set need to receive the DL allocation Information Element (IEs) to gain the knowledge regarding the DL transmission in order to correctly receive and decode it. Therefore, the DL allocation IEs should be provided to the stations in the cooperative set in time for the stations to receive the DL MIMO transmissions properly. Similar to the UL, one way is to set the recipient of the DL allocation IEs to the group of the cooperative set. As long as the stations are listening to the DL when the DL allocation IEs are transmitted, they will receive the DL allocation IEs correctly, without needing any stations to relay the DL allocation IEs.
  • IEs DL allocation Information Element
  • MTC devices measure channel state information (CSI) periodically and forward the measured CSI to the DAP so that the DAP may derive appropriate precoder information.
  • CSI channel state information
  • DAP may transmit reference symbols so that MTC devices may estimate the channel between the DAP and MTC devices and feed it back to the DAP.
  • MTC devices may transmit sounding reference symbols so that the DAP may measure the channel.
  • proper precoder information may be derived to support MU- MIMO.
  • the transmitter may receive ACK/NACK messages from the intended receiver and retransmits them if needed.
  • the base station may send an ACK/NACK message to the DAP. If all or a subset of data is not received correctly at the base station (indicated by a NACK message), the DAP may determine a data portion to be retransmitted and send a command to the MTC devices which may then retransmit the data portion that was not received correctly.
  • the synchronous UL HARQ procedure may work as it is, as long as all the stations in the cooperative set may receive the DL from the BS correctly, where the synchronous UL HARQ refers to the UL HARQ schemes with synchronous retransmission allocations (e.g., the UL HARQ as specified in 802.16m and long term evolution (LTE)).
  • LTE long term evolution
  • the synchronous UL HARQ schemes may need to have a longer interval between the synchronous UL retransmission allocations than a currently commonly used interval (e.g., four subframes in 802.16m synchronous UL HARQ). This may be due to the additional processing and transmission time required for the UL allocation information and HARQ acknowledgement to be propagated to all the stations.
  • the asynchronous UL HARQ may work with the proposed DAP coordinated UL MIMO scheme, as long as the UL allocations for the transmissions and retransmissions may be timely and properly provided to the stations in the cooperative set.
  • the HARQ acknowledgements may be transmitted by the DAP and/or designated station(s) after the DL diversity combining/decoding is completed. If a retransmission is needed, the information about the retransmission may be provided to all the stations in the cooperative set so that the stations may receive the retransmission properly.
  • the concepts covered in this disclosure describe networks containing a "single layer" of aggregation between MTC devices and the base station. However, they may also be applied to two or more layers of aggregation (e.g., as illustrated in FIG. 10).
  • a local DAP may collect data from several MTC devices and send an aggregate package to a wide-area DAP.
  • the wide-area DAP may use the same MIMO techniques described above, where the local DAPs act as smart antennas.
  • DAP may collect and process signals received by other DAPs (and/or MTC devices), apply MIMO processing to the signals, and distribute de-aggregated feeds to local DAPs (which, in tern, may de-aggregate and distribute the de- aggregated feeds to MTC devices). This extension may apply to multiple layers of aggregation and MIMO processing.
  • a method for multiple -input multiple -output (MIMO) communications between wireless transmit and receive units (WRTUs) comprising:
  • WTRUs to provide an aggregate signal
  • a wireless transmit/receive unit comprising:
  • a receiving unit configured to receive data and re-transmission information indicating a time to re-transmit the data
  • a transmitting unit configured to re-transmit the data at the time indicated by the re-transmission information.
  • Examples of computer- readable storage media include, but are not limited to, a read only memory (ROM), a random access memory (RAM), a register, cache memory, semiconductor memory devices, magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
  • ROM read only memory
  • RAM random access memory
  • register cache memory
  • semiconductor memory devices magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
  • a processor in association with software may be used to implement a radio frequency transceiver for use in a WTRU, UE, terminal, base station, RNC, or any host computer.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

L'invention concerne un procédé de communication à entrées multiples et à sorties multiples (MIMO) entre des unités de transmission et de réception sans fil (WTRU) qui comprend la réception, au niveau d'un point de regroupement (DAP), de données provenant d'une pluralité d'unités de transmission/de réception sans fil (WTRU), le regroupement, au niveau du DAP, des données reçues de la part de la pluralité de WTRU afin de fournir un signal agrégé, la transmission du signal agrégé à au moins deux de la pluralité de WTRU en vue de sa retransmission, et la détermination d'un modèle de codage pour la retransmission des données par lesdits au moins deux WTRU de la pluralité de WTRU.
PCT/US2012/034767 2011-04-25 2012-04-24 Point de regroupement de données (dap) en tant que point de coordination à entrées multiples et à sorties multiples (mimo) WO2012148896A2 (fr)

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TWI491228B (zh) 2012-12-26 2015-07-01 Ind Tech Res Inst 多網路上無線存取之頻寬整合方法與裝置

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US5596439A (en) * 1995-08-01 1997-01-21 Viasat, Inc. Self-interference cancellation for two-party relayed communication
WO2009066451A1 (fr) * 2007-11-21 2009-05-28 Panasonic Corporation Dispositif de communication sans fil, procédé de communication sans fil et système de communication sans fil

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