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WO2014113902A1 - Déplacement d'uci et nouvelle temporisation pusch permettant de lutter contre le brouillage dl-ul dans l'eimta - Google Patents

Déplacement d'uci et nouvelle temporisation pusch permettant de lutter contre le brouillage dl-ul dans l'eimta Download PDF

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Publication number
WO2014113902A1
WO2014113902A1 PCT/CN2013/000083 CN2013000083W WO2014113902A1 WO 2014113902 A1 WO2014113902 A1 WO 2014113902A1 CN 2013000083 W CN2013000083 W CN 2013000083W WO 2014113902 A1 WO2014113902 A1 WO 2014113902A1
Authority
WO
WIPO (PCT)
Prior art keywords
subframe
tdd
interfering
interference
serving cell
Prior art date
Application number
PCT/CN2013/000083
Other languages
English (en)
Inventor
Minghai Feng
Jiming Guo
Neng Wang
Chao Wei
Jilei Hou
Original Assignee
Qualcomm Incorporated
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 Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2013/000083 priority Critical patent/WO2014113902A1/fr
Publication of WO2014113902A1 publication Critical patent/WO2014113902A1/fr

Links

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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising 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
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences
    • 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
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0092—Indication of how the channel is divided
    • 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
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
    • 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
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
    • 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
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows

Definitions

  • Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, and the like. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing the available network resources.
  • a wireless communication network may include a number of base stations that can support communication for a number of mobile devices.
  • a mobile device may communicate with a base station via downlink (DL) and uplink (UL) transmissions.
  • the downlink (or forward link) refers to the communication link from the base station to the mobile device
  • the uplink (or reverse link) refers to the communication link from the mobile device to the base station.
  • Multiple access technologies may use Frequency Division Duplexing (FDD) or Time Division Duplexing (TDD) to provide uplink and downlink communications over one or more carriers.
  • TDD operation offers flexible deployments without requiring paired spectrum resources.
  • TDD formats include transmission of frames of data, each including a number of different subframes in which different subframes may be uplink or downlink subframes.
  • different formats may be used in which uplink and downlink communications may be asymmetric.
  • Flexible DL/UL configuration provides efficient ways to use unpaired spectrum resources and UL/DL configuration may be adaptive based on traffic conditions (e.g., UL/DL loading at the base station and/or mobile device). However, flexible UL/DL configurations of base stations may cause increased interference between and among base stations and mobile devices.
  • Described embodiments mitigate the effects of downlink-to-uplink interference in TDD systems by adapting timing for uplink control information and UL HARQ
  • uplink control information may be shifted to subframes that experience lower downlink interference from other cells.
  • subframes for transmission of uplink control information may be selected based on common UL subframes between the TDD UL-DL configurations used for the serving cell and the neighboring cells.
  • subframes for transmission of uplink control information may be selected based on UL subframes common to available TDD UL-DL configurations.
  • the set of available UL-DL configurations for neighboring cells may be adapted to trade off UCI transmission performance with UL/DL flexibility.
  • UL HARQ timing is modified such that UL transmissions and retransmissions experience similar interference profiles.
  • asynchronized UL HARQ may be used to schedule retransmissions in UL subframes with similar interference profiles as the original transmission (e.g., either UL-UL interference or DL-UL interference, etc.).
  • modified synchronous UL HARQ timing adapts retransmission to occur on UL subframes with similar interference profiles as the
  • the new UL HARQ timing may be based on the known TDD UL-DL configurations.
  • TDD UL-DL configurations for neighboring cells are unknown, the new UL HARQ timing may select UL subframes for retransmissions experiencing similar interference profiles as the original transmission for all available TDD UL-DL configurations of the neighboring cells.
  • the set of available UL-DL configurations for neighboring cells may be adapted to trade off UL HARQ performance with UL/DL flexibility.
  • Embodiments are directed to a method for mitigating interference for TDD carriers in a wireless communications network.
  • the method includes determining UCI for transmission to a serving cell during a first UL subframe, determining a reduced interference UL subframe of the serving cell corresponding to an UL subframe of an interfering network cell, and transmitting the UCI in the reduced interference UL subframe.
  • determining the reduced interference UL subframe includes determining a serving TDD configuration of the serving cell, determining an interfering TDD configuration of the interfering network cell, and determining, as the reduced interference UL subframe, a common UL subframe of the serving TDD configuration and the interfering TDD
  • determining the reduced interference UL subframe includes determining a serving TDD configuration of the serving cell, and determining the reduced interference UL subframe based on a common UL subframe of the serving TDD configuration and available interfering TDD configurations.
  • the reduced interference UL subframe may be the third subframe of every 10 ms radio frame of an LTE type 2 frame structure.
  • Some embodiments are directed to a method for mitigating interference for TDD carriers in a wireless communications network.
  • the method includes receiving, at a UE, a negative acknowledgement (NACK) from a serving cell associated with data transmitted by the UE in a first UL subframe, and selecting a retransmission UL subframe for the transmitted data based at least in part on a TDD configuration of a serving cell and a transmission direction of an interfering TDD carrier from an interfering cell for the first UL subframe.
  • the retransmission UL subframe may be an UL subframe having a same interference profile as the first UL subframe.
  • determining the transmission direction of the interfering TDD carrier of the interfering cell for the first UL subframe includes receiving the TDD configuration of the interfering network cell associated with the interfering TDD carrier.
  • the retransmission UL subframe is an UL subframe having a same interference profile as the first UL subframe for available TDD configurations of the interfering TDD carrier.
  • the available TDD configurations of the interfering TDD carrier may be a subset of LTE type 2 frame structure TDD configurations.
  • the method may include retransmitting the transmitted data in the selected retransmission UL subframe of the TDD carrier.
  • Embodiments are directed to a method for mitigating interference for TDD carriers in a wireless communications network including transmitting, from a serving cell, one or more data transmissions to a UE over one or more DL subframes, determining a reduced interference UL subframe for receiving UCI from the UE associated with the one or more data transmissions, the reduced interference UL subframe corresponding to an UL subframe of an interfering cell, and decoding the UCI based on the reduced interference UL subframe.
  • Determining the reduced interference UL subframe may include determining a serving TDD configuration of the serving cell, determining an interfering TDD configuration of the interfering cell, and determining, as the reduced interference UL subframe, a common UL subframe of the serving cell TDD configuration and the interfering network cell TDD configuration.
  • determining the reduced interference UL subframe includes determining a serving TDD configuration of the serving cell, determining the reduced interference UL subframe based on a common UL subframe of the serving cell TDD configuration and available TDD configurations for the interfering cell.
  • Embodiments are directed to a method for mitigating interference for TDD carriers in a wireless communications network including transmitting, to a UE, a NACK associated with data transmitted by the UE in a first UL subframe, and decoding a retransmitted UL subframe for the transmitted data, the retransmitted UL subframe being selected based at least in part on a TDD configuration of the serving cell and a transmission direction of an interfering TDD carrier for the first UL subframe.
  • the retransmitted UL subframe may be an UL subframe having a same interference profile as the first UL subframe.
  • the retransmitted UL subframe may be an UL subframe having a same interference profile as the first UL subframe for available TDD configurations of the interfering TDD carrier.
  • Embodiments are directed to an apparatus for mitigating interference for TDD carriers in a wireless communications network including means for determining UCI for transmission to a serving cell during a first UL subframe, means for determining a reduced interference UL subframe of the serving cell corresponding to an UL subframe of an interfering network cell, and means for transmitting the UCI in the reduced interference UL subframe.
  • the means for determining the reduced interference UL subframe may include means for determining a serving TDD configuration of the serving cell, means for
  • the means for determining the reduced interference UL subframe may include means for determining a serving TDD configuration of the serving cell, and means for determining the reduced interference UL subframe based on a common UL subframe of the serving TDD
  • Embodiments are directed to an apparatus for mitigating interference for TDD carriers in a wireless communications network including means for receiving, at UE, a NACK from a serving cell associated with data transmitted by the UE in a first UL subframe, and means for selecting a retransmission UL subframe for the transmitted data based at least in part on a TDD configuration of a serving cell and a transmission direction of an interfering TDD carrier from an interfering cell for the first UL sub frame.
  • the retransmission UL subframe may be an UL subframe having a same interference profile as the first UL sub frame.
  • the retransmission UL subframe may be an UL subframe having a same interference profile as the first UL subframe for available TDD configurations of the interfering TDD carrier.
  • Embodiments are directed to an apparatus for mitigating interference for TDD carriers in a wireless communications network including means for transmitting, from a serving cell, one or more data transmissions to a UE over one or more DL subframes, means for determining a reduced interference UL subframe for receiving UCI from the UE associated with the one or more data transmissions, the reduced interference UL subframe corresponding to an UL subframe of an interfering cell, and means for decoding the UCI based on the reduced interference UL subframe.
  • the means for determining the reduced interference UL subframe may include means for determining a serving TDD configuration of the serving cell, means for determining an interfering TDD configuration of the interfering cell, and means for determining, as the reduced interference UL subframe, a common UL subframe of the serving cell TDD configuration and the interfering network cell TDD configuration.
  • the means for determining the reduced interference UL subframe may include means for determining a serving TDD configuration of the serving cell, and means for determining the reduced interference UL subframe based on a common UL subframe of the serving cell TDD configuration and available TDD configurations for the interfering cell.
  • Embodiments are directed to an apparatus for mitigating interference for TDD carriers in a wireless communications network including means for transmitting, to a UE, a NACK associated with data transmitted by the UE in a first UL subframe, and means for decoding a retransmitted UL subframe for the transmitted data, the retransmitted UL subframe being selected based at least in part on a TDD configuration of the serving cell and a transmission direction of an interfering TDD carrier for the first UL subframe.
  • the retransmitted UL subframe may be an UL subframe having a same interference profile as the first UL subframe.
  • Embodiments are directed to a computer program product for mitigating interference for TDD carriers in a wireless communications network including a non- transitory computer-readable medium including code for causing a computer to determine UCI for transmission to a serving cell during a first UL subframe, code for causing the computer to determine a reduced interference UL subframe of the serving cell corresponding to an UL subframe of an interfering network cell, and code for causing the computer to transmit the UCI in the reduced interference UL subframe.
  • the non-transitory computer- readable medium may include code for causing the computer to determine a serving TDD configuration of the serving cell, code for causing the computer to determine an interfering TDD configuration of the interfering network cell, and code for causing the computer to determine, as the reduced interference UL subframe, a common UL subframe of the serving TDD configuration and the interfering TDD configuration.
  • the non-transitory computer- readable medium may include code for causing the computer to determine a serving TDD configuration of the serving cell, and code for causing the computer to determine the reduced interference UL subframe based on a common UL subframe of the serving TDD
  • Embodiments are directed to a computer program product for mitigating interference for TDD carriers in a wireless communications network including a non- transitory computer-readable medium including code for causing a computer to receive, at a UE, a NACK from a serving cell associated with data transmitted by the UE in a first UL subframe and code for causing the computer to select a retransmission UL subframe for the transmitted data based at least in part on a TDD configuration of a serving cell and a transmission direction of an interfering TDD carrier from an interfering cell for the first UL subframe.
  • the retransmission UL subframe may be an UL subframe having a same interference profile as the first UL subframe.
  • the retransmission UL subframe may be an UL subframe having a same interference profile as the first UL subframe for available TDD configurations of the interfering TDD carrier.
  • Embodiments are directed to a computer program product for mitigating interference for TDD carriers in a wireless communications network including a non- transitory computer-readable medium including code for causing a computer to transmit, from a serving cell, one or more data transmissions to a UE over one or more DL subframes, code for causing the computer to determine a reduced interference UL subframe for receiving UCI from the UE associated with the one or more data transmissions, the reduced interference UL subframe corresponding to an UL subframe of an interfering cell, and code for causing the computer to decode the UCI based on the reduced interference UL subframe.
  • the non-transitory computer-readable medium may include code for causing the computer to determine a serving TDD configuration of the serving cell, code for causing the computer to determine an interfering TDD configuration of the interfering cell, and code for causing the computer to determine, as the reduced interference UL subframe, a common UL subframe of the serving cell TDD configuration and the interfering network cell TDD configuration.
  • the non-transitory computer-readable medium may include code for causing the computer to determine a serving TDD configuration of the serving cell, and code for causing the computer to determine the reduced interference UL subframe based on a common UL subframe of the serving cell TDD configuration and available TDD configurations for the interfering cell.
  • Embodiments are directed to a computer program product for mitigating
  • interference for TDD carriers in a wireless communications network including a non- transitory computer-readable medium including code for causing a computer to transmit, to a UE, a NACK associated with data transmitted by the UE in a first UL subframe, and code for causing the computer to decode a retransmitted UL subframe for the transmitted data, the retransmitted UL subframe being selected based at least in part on a TDD configuration of the serving cell and a transmission direction of an interfering TDD carrier for the first UL subframe.
  • the retransmitted UL subframe may be an UL subframe having a same interference profile as the first UL subframe.
  • the retransmitted UL subframe may be an UL subframe having a same interference profile as the first UL subframe for available TDD configurations of the interfering TDD carrier.
  • Embodiments are directed to a communications device for mitigating interference for TDD carriers in a wireless communications network including at least one processor configured to determine UCI for transmission to a serving cell during a first UL subframe, determine a reduced interference UL subframe of the serving cell corresponding to an UL subframe of an interfering network cell, and transmit the UCI in the reduced interference UL subframe.
  • the at least one processor may be configured to determine a serving TDD configuration of the serving cell, determine an interfering TDD configuration of the interfering network cell, and determine, as the reduced interference UL subframe, a common UL subframe of the serving TDD configuration and the interfering TDD configuration.
  • the at least one processor may be configured to determine a serving TDD configuration of the serving cell, and determine the reduced interference UL subframe based on a common UL subframe of the serving TDD configuration and available interfering TDD configurations.
  • Embodiments are directed to a communications device for mitigating interference for TDD carriers in a wireless communications network including at least one processor configured to receive, at a UE, a NACK from a serving cell associated with data transmitted by the UE in a first UL subframe, and select a retransmission UL subframe for the transmitted data based at least in part on a TDD configuration of a serving cell and a transmission direction of an interfering TDD carrier from an interfering cell for the first UL subframe.
  • the retransmission UL subframe may be an UL subframe having a same interference profile as the first UL subframe.
  • the retransmission UL subframe may be an UL subframe having a same interference profile as the first UL subframe for available TDD configurations of the interfering TDD carrier.
  • Embodiments are directed to a communications device for mitigating interference for TDD carriers in a wireless communications network including at least one processor configured to transmit, from a serving cell, one or more data transmissions to a UE over one or more DL subframes, determine a reduced interference UL subframe for receiving UCI from the UE associated with the one or more data transmissions, the reduced interference UL subframe corresponding to an UL subframe of an interfering cell, and decode the UCI based on the reduced interference UL subframe.
  • the at least one processor may be configured to determine a serving TDD configuration of the serving cell, determine an interfering TDD configuration of the interfering cell, and determine, as the reduced interference UL subframe, a common UL subframe of the serving cell TDD configuration and the interfering network cell TDD configuration.
  • the at least one processor may be configured to determine a serving TDD configuration of the serving cell, and determine the reduced interference UL subframe based on a common UL subframe of the serving cell TDD configuration and available TDD configurations for the interfering cell.
  • Embodiments are directed to a communications device for mitigating interference for TDD carriers in a wireless communications network including at least one processor configured to transmit, to a UE, a NACK associated with data transmitted by the UE in a first UL subframe, and decode a retransmitted UL subframe for the transmitted data, the retransmitted UL subframe being selected based at least in part on a TDD configuration of the serving cell and a transmission direction of an interfering TDD carrier for the first UL subframe.
  • the retransmitted UL subframe may be an UL subframe having a same interference profile as the first UL subframe.
  • the retransmitted UL subframe may be an UL subframe having a same interference profile as the first UL subframe for available TDD configurations of the interfering TDD carrier.
  • FIG. 1 is a diagram illustrating an example of a wireless communications system in accordance with various embodiments
  • FIG. 2 illustrates an example network environment using TDD carriers during a subframe where some TDD transmissions are UL and some are DL transmissions in accordance with various embodiments;
  • FIG. 3 is a timing diagram illustrating DL HARQ operation for two frames in a TDD system in accordance with various embodiments;
  • FIG. 4 is a timing diagram illustrating UL HARQ operation for two frames in accordance with various embodiments
  • FIG. 5A is a timing diagram showing shifted UCI timing using known interfering cell TDD UL-DL configurations in accordance with various embodiments
  • FIG. 5B is a timing diagram illustrating an alternative embodiment for UCI shifting where TDD UL-DL configurations for neighboring or potentially interfering cells are not known by the serving cell and/or UE;
  • FIG. 6A illustrates a method for shifting UCI at a UE to mitigate DL-UL interference in accordance with various embodiments;
  • FIG. 6B illustrates a method for shifting UCI at a serving cell to mitigate DL-UL interference in accordance with various embodiments
  • FIG. 7A illustrates an alternative method for shifting UCI at a UE to mitigate DL- UL interference when UL-DL configurations for potentially interfering cells are unknown;
  • FIG. 7B illustrates an alternative method for shifting UCI at a serving cell to mitigate DL-UL interference when UL-DL configurations for potentially interfering cells are unknown;
  • FIG. 8 A is a timing diagram illustrating modified synchronous UL HARQ timing in accordance with various embodiments;
  • FIG. 8B is a timing diagram illustrating another example of modified synchronous UL HARQ timing in accordance with various embodiments.
  • FIG. 8C is a timing diagram illustrating an alternative embodiment of modified synchronous UL HARQ timing where TDD UL-DL configurations for interfering cells are unknown;
  • FIG. 9A illustrates a method for performing modified synchronous UL HARQ timing in accordance with various embodiments
  • FIG. 9B illustrates a method for performing modified synchronous UL HARQ timing in accordance with various embodiments
  • FIG. 10 illustrates a system for performing UCI shift and/or modifying synchronous UL HARQ timing in accordance with various embodiments
  • FIG. 11 shows a block diagram of a design of DL HARQ/UCI processor of a UE in accordance with various embodiments
  • FIG. 12 shows a block diagram of a design of UL HARQ processor of a UE in accordance with various embodiments
  • FIG. 13 shows a block diagram of a design of DL HARQ/UCI processor of a serving cell in accordance with various embodiments
  • FIG. 14 shows a block diagram of a design of UL HARQ processor of a serving cell in accordance with various embodiments
  • FIG. 15 is a block diagram of a mobile device 115-e configured for performing UCI shift and/or modifying synchronous UL HARQ timing in accordance with various embodiments.
  • FIG. 16 shows a block diagram of a communications system 1600 that may be configured for performing UCI shift and/or modifying synchronous UL HARQ timing in accordance with various embodiments.
  • uplink control information may be shifted to subframes that experience lower downlink interference from other cells.
  • subframes for transmission of uplink control information may be selected based on common UL subframes between the TDD UL-DL configurations used for the serving cell and the neighboring cells.
  • subframes for transmission of uplink control information may be selected based on UL subframes common to available TDD UL-DL configurations.
  • the set of available UL- DL configurations for neighboring cells may be adapted to trade off UCI transmission performance with UL/DL flexibility.
  • UL HARQ timing is modified such that UL transmissions and retransmissions experience similar interference profiles.
  • asynchronized UL HARQ may be used to schedule retransmissions in UL subframes with similar interference profiles as the original transmission (e.g., either UL-UL interference or DL-UL interference, etc.).
  • modified synchronous UL HARQ timing adapts retransmission to occur on UL subframes with similar interference profiles as the
  • the new UL HARQ timing may be based on the known TDD UL-DL configurations.
  • TDD UL-DL configurations for neighboring cells are unknown, the new UL HARQ timing may select UL subframes for retransmissions experiencing similar interference profiles as the original transmission for all available TDD UL-DL configurations of the neighboring cells.
  • the set of available UL-DL configurations for neighboring cells may be adapted to trade off UL HARQ performance with UL/DL flexibility.
  • Techniques described herein may be used for various wireless communications systems such as cellular wireless systems, Peer-to-Peer wireless communications, wireless local access networks (WLANs), ad hoc networks, satellite communications systems, and other systems.
  • WLANs wireless local access networks
  • system and “network” are often used interchangeably.
  • These wireless communications systems may employ a variety of radio communication
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal FDMA
  • Radio Access Technology A wireless communications system or network that implements a Radio Access Technology may be called a Radio Access Network (RAN).
  • RAN Radio Access Network
  • Examples of Radio Access Technologies employing CDMA techniques include CDMA2000, Universal Terrestrial Radio Access (UTRA), etc.
  • CDMA2000 covers IS-2000, IS-95, and IS-856 standards.
  • IS-2000 Releases 0 and A are commonly referred to as
  • IS-856 (TIA-856) is commonly referred to as CDMA2000 lxEV- DO, High Rate Packet Data (HRPD), etc.
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. Examples of TDMA systems include various implementations of Global System for Mobile Communications (GSM). Examples of Radio Access
  • UMB Ultra Mobile Broadband
  • E-UTRA Evolved UTRA
  • Wi-Fi IEEE 802.11
  • WiMAX IEEE 802.16
  • Flash-OFDM Flash-OFDM
  • UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS).
  • 3 GPP Long Term Evolution (LTE) and LTE- Advanced (LTE-A) are new releases of UMTS that use E-UTRA.
  • UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3 GPP).
  • CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2).
  • the techniques described herein may be used for the systems and radio technologies mentioned above as well as other systems and radio technologies.
  • FIG. 1 a diagram illustrates an example of a wireless
  • the system 100 includes base stations (or cells) 105, communication devices 1 15, and a core network 130.
  • the base stations 105 may be base stations (or cells) 105, communication devices 1 15, and a core network 130.
  • the base stations 105 may
  • Base stations 105 may communicate control information and/or user data with the core network 130 through backhaul links 132.
  • Backhaul links 132 may be wired backhaul links (e.g., copper, fiber, etc.) and/or wireless backhaul links (e.g., microwave, etc.).
  • the base stations 105 may communicate, either directly or indirectly, with each other over backhaul links 134, which may be wired or wireless communication links.
  • the system 100 may support operation on multiple carriers (waveform signals of different frequencies). Multi-carrier transmitters can transmit modulated signals simultaneously on the multiple carriers.
  • each communication link 125 may be a multi-carrier signal modulated according to the various radio technologies described above.
  • Each modulated signal may be sent on a different carrier and may carry control information (e.g., reference signals, control channels, etc.), overhead information, data, etc.
  • the base stations 105 may wirelessly communicate with the devices 1 15 via one or more base station antennas. Each of the base station 105 sites may provide communication coverage for a respective coverage area 1 10.
  • base stations 105 may be referred to as a base transceiver station, a radio base station, an access point, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a NodeB, eNodeB (eNB), Home NodeB, a Home eNodeB, or some other suitable terminology.
  • the coverage area 1 10 for a base station may be divided into sectors making up only a portion of the coverage area (not shown).
  • the system 100 may include base stations 105 of different types (e.g., macro, micro, and/or pico base stations). There may be overlapping coverage areas for different technologies.
  • the wireless network 100 may support synchronous or asynchronous operation.
  • the eNBs may have similar frame timing, and transmissions from different eNBs may be approximately aligned in time.
  • the eNBs may have different frame timing, and transmissions from different eNBs may not be aligned in time.
  • some eNBs 105 may be synchronous while other eNBs may be asynchronous.
  • the communication devices 1 15 are dispersed throughout the wireless network 100, and each device may be stationary or mobile.
  • a communication device 1 15 may also be referred to by those skilled in the art as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a user equipment, a mobile client, a client, or some other suitable terminology.
  • a communication device 1 15 may be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, or the like.
  • a communication device may be able to communicate with macro base stations, pico base stations, femto base stations, relay base stations, and the like.
  • the transmission links 125 shown in network 100 may include uplink (UL) transmissions from a mobile device 1 15 to a base station 105, and/or downlink (DL) transmissions, from a base station 105 to a mobile device 1 15.
  • the downlink transmissions may also be called forward link transmissions while the uplink transmissions may also be called reverse link transmissions.
  • the transmission links 125 are TDD carriers carrying bidirectional traffic within traffic frames.
  • the system 100 is an LTE/LTE-A network.
  • the terms evolved Node B (eNB) and user equipment (UE) may be generally used to describe the base stations 105 and communication devices 1 15, respectively.
  • the system 100 may be a Heterogeneous LTE/LTE-A network in which different types of eNBs provide coverage for various geographical regions.
  • each eNB 105 may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or other types of cell.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a pico cell would generally cover a relatively smaller geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a femto cell would also generally cover a relatively small geographic area (e.g.
  • a home and, in addition to unrestricted access, may also provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs for users in the home, and the like).
  • An eNB for a macro cell may be referred to as a macro eNB.
  • An eNB for a pico cell may be referred to as a pico eNB.
  • an eNB for a femto cell may be referred to as a femto eNB or a home eNB.
  • An eNB may support one or multiple (e.g., two, three, four, and the like) cells.
  • the communications system 100 may be referred to as an Evolved Packet System (EPS) 100.
  • the EPS 100 may include one or more UEs 1 15, an Evolved UMTS Terrestrial Radio Access Network (E-UTRAN), an Evolved Packet Core (EPC) 130 (e.g., core network 130), a Home Subscriber Server (HSS), and an Operator's IP Services.
  • E-UTRAN Evolved UMTS Terrestrial Radio Access Network
  • EPC Evolved Packet Core
  • HSS Home Subscriber Server
  • the EPS may interconnect with other access networks using other Radio Access Technologies.
  • EPS 100 may interconnect with a UTRAN- based network and/or a CDMA-based network via one or more Serving GPRS Support Nodes (SGSNs).
  • SGSNs Serving GPRS Support Nodes
  • EPS 100 may support handover of UEs 1 15 between a source eNB 105 and a target eNB 105.
  • EPS 100 may support intra-RAT handover between eNBs 105 and/or base stations of the same RAT (e.g., other E-UTRAN networks), and inter-RAT handovers between eNBs and/or base stations of different RATs (e.g., E-UTRAN to CDMA, etc.).
  • the EPS 100 may provide packet-switched services, however, as those skilled in the art will readily appreciate, the various concepts presented throughout this disclosure may be extended to networks providing circuit-switched services.
  • the E-UTRAN may include the eNBs 105 and may provide user plane and control plane protocol terminations toward the UEs 1 15.
  • the eNBs 105 may be connected to other eNBs 105 via backhaul link 134 (e.g., an X2 interface, and the like).
  • the eNBs 105 may provide an access point to the EPC 130 for the UEs 1 15.
  • the eNBs 105 may be connected by backhaul link 132 (e.g., an S I interface, and the like) to the EPC 130.
  • Logical nodes within EPC 130 may include one or more Mobility Management Entities (MMEs), one or more Serving Gateways, and one or more Packet Data Network (PDN) Gateways (not shown).
  • MMEs Mobility Management Entities
  • PDN Packet Data Network Gateways
  • the MME may provide bearer and connection management. All user IP packets may be transferred through the Serving Gateway, which itself may be connected to the PDN Gateway.
  • the PDN Gateway may provide UE IP address allocation as well as other functions.
  • the PDN Gateway may be connected to IP networks and/or the operator's IP Services. These logical nodes may be implemented in separate physical nodes or one or more may be combined in a single physical node.
  • the IP Networks/Operator's IP Services may include the Internet, an Intranet, an IP Multimedia Subsystem (IMS), and/or a Packet- Switched (PS) Streaming Service (PS).
  • IMS IP Multimedia Subsystem
  • PS Packet- Switched
  • PSS Packet- Switched
  • the UEs 1 15 may be configured to collaboratively communicate with multiple eNBs 105 through, for example, Multiple Input Multiple Output (MIMO), Coordinated
  • MIMO Multiple Input Multiple Output
  • CoMP Multi-Point
  • MIMO techniques use multiple antennas on the base stations and/or multiple antennas on the UE to take advantage of multipath environments to transmit multiple data streams. Each data stream may be called a "layer” and the "rank" of the communication link may indicate the number of layers used for communication.
  • CoMP includes techniques for dynamic coordination of transmission and reception by a number of eNBs to improve overall transmission quality for UEs as well as increasing network and spectrum utilization.
  • CoMP techniques utilize backhaul links 132 and/or 134 for communication between base stations 105 to coordinate control plane and user plane communications for the UEs 1 15.
  • the communication networks that may accommodate some of the various disclosed embodiments may be packet-based networks that operate according to a layered protocol stack.
  • communications at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based.
  • a Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate over logical channels.
  • RLC Radio Link Control
  • a Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels.
  • the MAC layer may also use Hybrid ARQ (HARQ) to provide retransmission at the MAC layer to ensure reliable data transmission.
  • HARQ Hybrid ARQ
  • the Radio Resource Control (RRC) protocol layer may provide establishment, configuration, and maintenance of an RRC connection between the UE and the network used for the user plane data.
  • the transport channels may be mapped to Physical channels.
  • the downlink physical channels may include at least one of a physical downlink control channel (PDCCH), a physical hybrid ARQ indicator channel (PHICH), and a physical downlink shared channel (PDSCH).
  • the uplink physical channels may include at least one of a physical uplink control channel (PUCCH) and a physical uplink shared channel (PUSCH).
  • the UE may transmit control information in the PUCCH on the assigned resource blocks in the control section.
  • the UE may transmit only data or both data and control information in the PUSCH on the assigned resource blocks in the data section.
  • a UL transmission may span both slots of a subframe and may hop across frequency
  • LTE/LTE-A utilizes orthogonal frequency division multiple-access (OFDMA) on the downlink and single-carrier frequency division multiple-access (SC-FDMA) on the uplink.
  • OFDMA and/or SC-FDMA carrier may be partitioned into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, or the like. Each subcarrier may be modulated with data.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system bandwidth.
  • K may be equal to 72, 180, 300, 600, 900, or 1200 with a subcarrier spacing of 15 kilohertz (KHz) for a corresponding system bandwidth (with guardband) of 1.4, 3, 5, 10, 15, or 20 megahertz (MHz), respectively.
  • the system bandwidth may also be partitioned into sub-bands.
  • a sub-band may cover 1.08 MHz, and there may be 1, 2, 4, 8 or 16 sub-bands.
  • the carriers may transmit bidirectional communications using FDD (e.g., using paired spectrum resources) or TDD operation (e.g., using unpaired spectrum resources).
  • FDD e.g., using paired spectrum resources
  • TDD operation e.g., using unpaired spectrum resources
  • Frame structures for FDD e.g., frame structure type 1
  • TDD e.g., frame structure type 2
  • each subframe may carry UL or DL traffic, and special sub frames (“S”) may be used to switch between DL to UL transmission.
  • S special sub frames
  • Allocation of UL and DL subframes within radio frames may be symmetric or asymmetric and may be reconfigured semi-statically (e.g., via backhaul messaging over S I and/or X2 interfaces, etc.).
  • Special subframes may carry some DL and/or UL traffic and may include a Guard Period (GP) between DL and UL traffic. Switching from UL to DL traffic may be achieved by setting timing advance at the UEs without the use of Special subframes or a guard period between UL and DL subframes.
  • UL-DL configurations with switch-point periodicity equal to the frame period (e.g., 10 ms) or half of the frame period (e.g., 5 ms) may be supported.
  • TDD frames may include one or more Special frames, and the period between Special frames may determine the TDD DL-to-UL switch-point periodicity for the frame.
  • rapidly changing traffic conditions may be accommodated through dynamic adaptation of UL-DL configuration for a particular eNB 105 and/or UE 115.
  • Such dynamic reconfiguration may be transmitted to a UE 115 through signaling from the eNB 105, such as through control channel signaling, and apply to one or more subsequent TDD frames.
  • Such reconfigurations may be accomplished according to "enhanced Interference Management and Traffic Adaptation" (elMTA), which may be implemented in some networks.
  • elMTA "enhanced Interference Management and Traffic Adaptation”
  • While adaptive UL-DL configuration may increase the efficiency of TDD operation, it may cause DL-UL interference when adjacent eNBs have different TDD UL-DL
  • FIG. 2 illustrates an example network environment 200 using TDD carriers during a subframe where some TDD transmissions are UL and some are DL transmissions.
  • Network environment 200 may illustrate, for example, aspects of wireless communications system 100 of FIG. 1.
  • the subframe illustrated in FIG. 2 may be an UL subframe for eNB 105-a, a DL subframe for eNB 105-b, and an UL subframe for eNB 105-c.
  • UE 115-a is performing an UL transmission 220-a to eNB 105-a
  • eNB 105-b is performing a DL transmission 230-b to UE 115-b
  • UE 115-c is performing an UL transmission 220-c to eNB 105-c.
  • Interfering DL transmission 235-b from eNB 105-b may cause DL-UL interference to UL transmission 220-a from UE 115 -a and/or UL transmission 220-c from UE 115-c
  • interfering UL transmissions 225-a and 225-c may cause UL-DL interference to UE 115-b.
  • LTE/LTE-A TDD operation supports multi-process Type II HA Q with a configurable number of independent HARQ processes.
  • LTE/LTE-A uses asynchronous HARQ transmission on the downlink and synchronous HARQ transmission on the uplink.
  • Adaptive modulation and coding (AMC) attempts to match the transmissions from a HARQ process to the channel conditions. For synchronous HARQ on the uplink, retransmission is assigned the same MCS and coding rate as the initial transmission.
  • FIG. 3 is a timing diagram 300 illustrating DL HARQ operation for two frames 310 in a TDD system.
  • a serving cell is configured according to TDD UL-DL configuration 0 and an interfering cell is configured according to TDD UL-DL configuration 1.
  • the HARQ process includes determining a HARQ ACK/NACK for each subframe and a resource index for transmission of the HARQ ACK/NACK.
  • the UE may determine a subframe for transmitting the associated ACK/NACK information according to n+k, where k is given in Table 2.
  • Table 2 Uplink ACK/NACK timing index k for TDD
  • DL data may be transmitted from the serving cell to a UE during subframe 1 of frame 310-a.
  • the UE may respond with ACK/NACK information 325-a for the DL transmission 320-a during subframe 7 of frame 310-a.
  • subframe 7 of frame 310-a is also an UL subframe for the interfering cell. Therefore, when the serving cell receives ACK/NACK 325-a in subframe 7 of frame 310-a, the serving cell will also receive UL-UL interference from other UEs transmitting to the interfering cell.
  • DL HARQ process 1 may experience different interference conditions.
  • the ACK/NACK 325-b transmitted by the UE during subframe 9 of frame 310-a may incur DL-UL interference at the serving cell because of the DL transmission by the interfering cell.
  • the relatively higher DL-UL interference during UL subframes of the serving cell corresponding to DL subframes of the interfering cell may result in degraded UL-DL scheduling performance, and a reduction in DL HARQ operation performance.
  • Interference from other cells may also have an impact on UL HARQ processes.
  • UL transmission and retransmission may occur on sub-frames with different interference characteristics (e.g., UL-UL and DL-UL), which may cause various inefficiencies in the UL HARQ processes. For example, if an UL transmission occurs on a subframe with UL-UL interference but retransmission occurs on a subframe with DL-UL interference, the retransmission will likely be difficult to decode at the serving cell. In contrast, where transmission occurs on a subframe with DL-UL interference and retransmission occurs on a subframe with UL-UL interference, rate selection for transmission may be too conservative.
  • FIG. 4 is a timing diagram 400 illustrating UL HARQ operation for two frames 410-a and 410-b.
  • a serving cell is configured according to TDD UL-DL configuration 0 and an interfering cell is configured according to TDD UL-DL configuration 1.
  • ACK/NACK In UL HARQ operation, ACK/NACK
  • each HARQ process will automatically (e.g., no explicit grant is required) retransmit in the next subframe available for transmission (e.g., with no scheduled UL transmission) at least 4 subframes after receiving the NACK for the original UL transmission.
  • HARQ process 0 may transmit UL data during subframe 2 of frame 410-a.
  • ACK/NACK information 435-a for the data transmission may be received in subframe 6 of frame 410-a.
  • the retransmission may occur in an UL subframe at least 4 subframes after ACK/NACK information 435-a is received (e.g., after subframe 0 of frame 410-b). Because HARQ process 6 may be scheduled in subframe 2 of frame 410-b, HARQ process 0 may perform retransmission 440-a in subframe 3 of frame 410-b. Retransmission 440-a occurs on an UL subframe of the serving cell that corresponds to a DL subframe of the interfering cell. Because the noise power spectral density at the serving cell is likely higher during the retransmission, it may be difficult for the serving cell to decode retransmission 440-a correctly. Thus, the UL HARQ process may require additional retransmissions and efficiency may be lost.
  • Transmission 430-b occurs during subframe 4 of frame 410-a, which for the interfering cell is a DL subframe.
  • Retransmission 440-b after receiving NACK 435-b occurs on subframe 7 of frame 410-b, which for the interfering cell is an UL subframe.
  • retransmission 440-b will likely experience lower noise power spectral density at the serving cell and transmission rate selection for HARQ process 2 may be too conservative, causing a lower than necessary data rate to be used.
  • the different aspects of system 100 and/or environment 200 may be configured to mitigate the effects of downlink-to- uplink interference in TDD systems by adapting timing for uplink control information and UL HARQ retransmission.
  • uplink control information may be shifted to subframes that experience lower downlink interference from other cells.
  • subframes for transmission of uplink control information may be selected based on common UL subframes between the TDD UL-DL configurations used for the serving cell and the neighboring cells.
  • subframes for transmission of uplink control information may be selected based on UL subframes common to available TDD UL-DL configurations.
  • the set of available UL-DL configurations for neighboring cells may be adapted to trade off UCI transmission
  • UL HARQ timing is modified such that UL transmissions and retransmissions experience similar interference profiles.
  • asynchronized UL HARQ may be used to schedule retransmissions in UL subframes with similar interference profiles as the original transmission (e.g., either UL-UL interference or DL-UL interference, etc.).
  • modified synchronous UL HARQ timing adapts retransmission to occur on UL subframes with similar interference profiles as the
  • the new UL HARQ timing may be based on the known TDD UL-DL configurations.
  • TDD UL-DL configurations for neighboring cells are unknown, the new UL HARQ timing may select UL subframes for retransmissions experiencing similar interference profiles as the original transmission for all available TDD UL-DL configurations of the neighboring cells.
  • the set of available UL-DL configurations for neighboring cells may be adapted to trade off UL HARQ performance with UL/DL flexibility.
  • FIG. 5A is a timing diagram 500-a showing shifted UCI timing using known interfering cell TDD UL-DL configurations in accordance with various embodiments.
  • a TDD carrier of a serving cell is configured according to TDD UL- DL configuration 0 and a TDD carrier of an interfering cell is configured according to TDD UL-DL configuration 1 for a first frame 510-a and second frame 510-b.
  • Shifted UCI timing as illustrated in FIG. 5A may be employed in TDD network environments such as systems 100 and/or 200.
  • timing diagram 500-a DL transmission 520-a from the serving cell for HARQ process 1 occurs on subframe 5 of frame 510-a.
  • the receiving UE shifts transmission of DL HARQ ACK/NACK 525-a from subframe 9 of frame 510-a, which experiences DL-UL interference from the interfering cell, to subframe 2 of frame 510-b, which experiences UL-UL interference.
  • HARQ process 3 may receive DL transmission 525-b on subframe 0 of frame 510-b and shift the DL HARQ ACK/NACK 525-b from subframe 4 of frame 510-b to subframe 7 of frame 510-b.
  • FIG. 5 A illustrates one example of shifted UCI timing where the serving cell uses TDD UL- DL configuration 0 and the interfering cell uses TDD UL-DL configuration 1, one of skill in the art may apply the illustrated techniques to any combination of TDD UL-DL
  • FIG. 5B is a timing diagram 500-b illustrating an alternative embodiment for UCI shifting where TDD UL-DL configurations for neighboring or potentially interfering cells are not known by the serving cell and/or UE.
  • the set of TDD UL-DL configurations for the serving and neighboring cells may have some subframes that are always UL or DL subframes.
  • subframe 2 is an UL subframe for LTE/LTE-A TDD UL-DL configurations 0 through 6.
  • the UE shifts UCI transmissions to subframe 2.
  • the UE may receive DL transmission 520-c during subframe 1 of frame 510-c and shift DL HA Q ACK/NACK 525- c for DL transmission 520-c from subframe 7 of frame 510-c to subframe.
  • the UE may also shift DL HARQ ACK/NACKs 525-d and 525-e to subframe 2 of frames 510-c or 510-d.
  • a UE may convert multiple HARQ ACK/NACKs into a single HARQ ACK/NACK via bundling or
  • Bundling of acknowledgments includes combining the outcome of the determined ACK/NACK from multiple subframes into a single HARQ acknowledgment. Such combining may be accomplished through, for example, a logical AND of the respective ACK/NACK determinations.
  • the single HARQ acknowledgement is transmitted from one of the determined HARQ resource index.
  • timing diagrams 500-a and 500-b illustrate shifting DL HARQ ACK/NACK information
  • UCI uplink control information
  • Shifted UCI may include sounding reference signals (SRS), channel state information (CSI), channel quality information (CQI), rank indicator (RI), precoding matrix indicator (PMI), and scheduling requests (SR), according to various embodiments.
  • SRS sounding reference signals
  • CSI channel state information
  • CQI channel quality information
  • RI rank indicator
  • PMI precoding matrix indicator
  • SR scheduling requests
  • FIG. 6A illustrates a method 600-a for shifting UCI at a UE to mitigate DL-UL interference in accordance with various embodiments.
  • Method 600-a may be used in environment 200 and/or system 100.
  • Method 600-a may be used, for example, by UEs 115 illustrated in FIG. 1 and/or FIG. 2 for shifting UCI from subframes with DL-UL interference to UL-UL interference subframes.
  • Method 600-a may begin at block 605 where UCI is determined for transmission to a serving cell.
  • UCI is determined for transmission to a serving cell.
  • SRS, CSI, CQI, RI, PMI, SR, and/or DL HARQ ACK/NACK information may be determined by the UE for transmission and may be scheduled for transmission during subframes determined according to various UCI transmission schedules.
  • the UE 115 may determine TDD UL/DL configurations for one or more adjacent and/or interfering cells. For example, UE 115 may receive the TDD UL/DL configurations for neighboring cells from the serving cell.
  • the UE may determine reduced interference UL subframes based on TDD UL/DL configurations of the serving cell and one or more interfering cells. For example, the UE may determine common UL subframes between the serving cell TDD UL/DL configuration and the TDD UL/DL configurations of potentially interfering cells.
  • the may select a reduced interference UL sub frame for transmission of the UCI from the UE to the serving cell.
  • the UE may transmit the UCI on the selected reduced interference UL subframe to the serving cell.
  • FIG. 6B illustrates a method 600-b for shifting UCI at a serving cell to mitigate DL- UL interference in accordance with various embodiments.
  • Method 600-b may be used in environment 200 and/or system 100.
  • Method 600-b may be used, for example, by eNBs 105 illustrated in FIG. 1 and/or FIG. 2 for shifting UCI from subframes with DL-UL interference to UL-UL interference subframes.
  • Method 600-b may begin at block 630 where the serving cell may transmit DL data to a UE.
  • the serving cell may determine TDD UL/DL configurations for one or more adjacent and/or interfering cells. For example, the serving cell may receive (e.g., via backhaul) the TDD UL/DL configurations for neighboring cells. The serving cell may send the TDD UL/DL configurations for neighboring cells to the UE. Alternatively, the serving cell may determine the TDD UL/DL configurations for potentially interfering cells by detecting the TDD UL/DL configurations from transmitted signals from the potentially interfering cells (e.g., detecting reference signals, etc.).
  • the serving cell may determine reduced interference UL subframes based on TDD UL/DL configurations of the serving cell and one or more interfering cells. For example, the UE and/or serving cell may determine common UL subframes between the serving cell TDD UL/DL configuration and the TDD UL/DL configurations of potentially interfering cells.
  • the serving cell may select a reduced interference UL sub frame for transmission of the UCI from the UE to the serving cell.
  • the UE may decode the UCI received on the selected reduced interference UL sub frame.
  • FIG. 7A illustrates an alternative method 700-a for shifting UCI at a UE to mitigate DL-UL interference of a TDD carrier when UL-DL configurations for potentially interfering cells are unknown.
  • Method 700-a may be used in environment 200 and/or system 100.
  • Method 700-a may be used, for example, by UEs 115 illustrated in FIG. 1 and/or FIG. 2 for shifting UCI from subframes with DL-UL interference to UL-UL interference subframes.
  • Method 700-a may begin at block 705 where UCI is determined for transmission to a serving cell.
  • UCI is determined for transmission to a serving cell.
  • S S, CSI, CQI, RI, PMI, SR, and/or DL HARQ ACK/NACK information may be determined by the UE for transmission and may be scheduled for transmission during subframes determined according to various UCI transmission schedules.
  • the UE may determine reduced interference UL subframes for transmission of the UCI based on the TDD UL/DL configuration of the serving cell and available TDD UL-DL configurations for one or more potentially interfering cells. For example, the UE may determine, based on the set of available TDD UL/DL configurations, one or more subframes that are UL subframes in the set of configurations. In some embodiments, the set of UL/DL configurations may be selected for use by neighboring cells (e.g., cell clusters, etc.) to improve UCI shifting performance at the expense of TDD UL-DL configuration flexibility. The selected set of UL-DL configurations may be a subset of TDD UL-DL configurations.
  • the selected set of TDD UL-DL configurations includes configurations with a TDD switch period of 5 ms (e.g., TDD UL-DL configurations 0, 1, 2, and 6). These TDD UL-DL configurations have two UL subframes in common and may improve performance for UCI shifting at the expense of some DL capacity.
  • the UE may select a reduced interference UL sub frame for transmission of the UCI from the UE to the serving cell.
  • the UE may transmit the UCI on the selected reduced interference UL subframe to the serving cell.
  • FIG. 7B illustrates an alternative method 700-b for shifting UCI at a serving cell to mitigate DL-UL interference of a TDD carrier when UL-DL configurations for potentially interfering cells are unknown.
  • Method 700-b may be used in environment 200 and/or system 100.
  • Method 700-b may be used, for example, by eNBs 105 illustrated in FIG. 1 and/or FIG. 2 for shifting UCI from subframes with DL-UL interference to UL-UL interference subframes.
  • Method 700-b may begin at block 730 where the serving cell may transmit DL data to a UE.
  • the serving cell may determine reduced interference UL subframes for receiving UCI associated with the DL transmissions based on the TDD UL/DL
  • the serving cell may determine, based on the set of available TDD UL/DL configurations, one or more subframes that are UL subframes across the set of configurations.
  • the set of UL/DL configurations may be selected for use by neighboring cells (e.g., cell clusters, etc.) to improve UCI shifting performance at the expense of TDD UL-DL configuration flexibility.
  • the selected set of UL- DL configurations may be a subset of TDD UL-DL configurations.
  • the selected set of TDD UL-DL configurations includes configurations with a TDD switch period of 5 ms (e.g., TDD UL-DL configurations 0, 1, 2, and 6). These TDD UL-DL configurations have two UL subframes in common and may improve performance for UCI shifting at the expense of some DL capacity.
  • FIG. 8A is a timing diagram 800-a illustrating modified synchronous UL HA Q timing in accordance with various embodiments.
  • a TDD carrier of a serving cell is configured according to TDD UL-DL configuration 0 and a TDD carrier of an interfering cell is configured according to TDD UL-DL configuration 1 for frames 810-a through 810-d.
  • Modified synchronous UL HARQ timing as illustrated in FIG. 8 A may be employed in TDD network environments such as systems 100 and/or 200.
  • HARQ process 1 may perform an UL data transmission during subframe 3 of frame 810-a.
  • ACK/NACK information 835-a for the data transmission may be received in subframe 0 of frame 810-b.
  • the retransmission 840-a may occur in an UL subframe at least 4 subframes after ACK/NACK information 835-a is received (e.g., on or after subframe 4 of frame 810-b). While subframe 4 of frame 810-b may be available for UL transmission, the UE may perform the retransmission 840-a on subframe 8 of frame 810-b according to the modified synchronous UL HARQ timing illustrated in timing diagram 800-a.
  • FIG. 8B is a timing diagram 800-b illustrating another example of modified synchronous UL HARQ timing in accordance with various embodiments.
  • a TDD carrier of a serving cell is configured according to TDD UL-DL configuration 6 and a TDD carrier of an interfering cell is configured according to TDD UL-DL
  • Modified synchronous UL HARQ timing as illustrated in FIG. 8B may be employed in TDD network environments such as systems 100 and/or 200.
  • HARQ process 4 may perform an UL data transmission during subframe 8 of frame 810-e.
  • ACK/NACK information 835-b for the data transmission may be received in subframe 5 of frame 810-f.
  • the retransmission 840-b may occur in an UL subframe at least 4 subframes after ACK/NACK information 835-b is received (e.g., on or after subframe 9 of frame 810-f).
  • the UE may perform the retransmission 840-b on subframe 8 of frame 810-g according to the modified synchronous UL HARQ timing illustrated in timing diagram 800-b.
  • the modified synchronous UL HARQ timing may perform UL retransmissions for each UL HARQ process on a next available UL subframe (e.g., on or after 4 subframes after receiving the NACK) with an interference profile (e.g., DL-UL interference or UL-UL interference) matching the original transmission.
  • an interference profile e.g., DL-UL interference or UL-UL interference
  • FIG. 8 A and 8B illustrate examples of modified synchronous UL HARQ timing for specific TDD UL-DL configurations for the serving cell and interfering cell, one of skill in the art may apply the illustrated techniques to any combination of TDD UL-DL configurations as well as instances where there are multiple interfering cells.
  • the set of UL/DL configurations may be selected for use by neighboring cells (e.g., cell clusters, etc.) to improve synchronous UL HARQ performance at the expense of TDD UL-DL configuration flexibility.
  • the selected set of UL-DL may be selected for use by neighboring cells (e.g., cell clusters, etc.) to improve synchronous UL HARQ performance at the expense of TDD UL-DL configuration flexibility.
  • TDD UL-DL configurations may be a subset of TDD UL-DL configurations.
  • the selected set of TDD UL-DL configurations includes configurations with a TDD switch period of 5 ms (e.g., configurations 0, 1, 2, and 6).
  • These TDD UL-DL configurations have two UL subframes in common and may improve performance for the modified synchronous UL HA Q techniques described with reference to FIGS. 8 A and 8B at the expense of some DL capacity.
  • FIG. 8C is a timing diagram 800-c illustrating an alternative embodiment of modified synchronous UL HARQ timing where TDD UL-DL configurations for interfering cells are unknown.
  • a TDD carrier of a serving cell is configured according to TDD UL-DL configuration 0 and the TDD UL-DL configuration for a TDD carrier of an interfering cell is unknown for frames 810-i through 810-1.
  • Modified synchronous UL HARQ timing as illustrated in FIG. 8C may be employed in TDD network environments such as systems 100 and/or 200.
  • UL HARQ processes may perform UL data retransmissions during UL subframes with the same subframe number as the original UL transmissions.
  • UL HARQ process 1 may send UL data transmission 830-c during subframe 3 of frame 810-i and receive ACK/NACK information 835-c for the data in subframe 0 of frame 810-j.
  • ACK/NACK information 835-c indicates a NACK of the UL data transmission
  • the retransmission 840-c may occur in an UL subframe at least 4 subframes after ACK/NACK information 835-c is received (e.g., on or after subframe 4 of frame 810-j). While subframe 4 of frame 810-j may be available for UL transmission, the UE may perform the retransmission 840-c on subframe 3 of frame 810-k according to the modified synchronous UL HARQ timing illustrated in timing diagram 800-c.
  • FIG. 9 A illustrates a method 900-a for performing modified synchronous UL HARQ timing in accordance with various embodiments.
  • Method 900-a may be used in environment 200 and/or system 100.
  • Method 900-a may be used, for example, UEs 115 illustrated in FIG. 1 and/or FIG. 2 for performing UL HARQ retransmissions during subframes with the same interference profile (e.g., DL-UL interference or UL-UL
  • Method 900-a may be performed by each UL HARQ process of the UEs 115.
  • Method 900-a may begin at block 905, where an UL HARQ process at the UE may perform a data transmission during an UL subframe.
  • the UE may receive a NACK from the serving cell for the UL transmission.
  • the UE may determine TDD UL-DL configurations of possibly interfering cells.
  • the serving cell may transmit the TDD UL-DL configurations for possibly interfering cells to the UE.
  • the UE may select an UL subframe for retransmission having the same interference profile as the UL subframe of the original data transmission in block 905.
  • the UE may also determine the UL subframe for retransmission according to other synchronous UL HARQ rules (e.g., at least 4 subframes after receiving NACK, etc.).
  • the UE may determine whether there is a scheduled data transmission on the selected UL subframe from block 920. If a data transmission is already scheduled on the selected subframe, method 900-a may return to block 915 to select a new UL subframe for retransmission based on the TDD UL-DL configurations of interfering cells.
  • the UE may perform the retransmission on the selected UL subframe at block 930.
  • the UL HARQ process may be repeated if another NACK is received for the retransmission at block 930.
  • FIG. 9B illustrates a method 900-b for performing modified synchronous UL HARQ timing in accordance with various embodiments.
  • Method 900-b may be used in environment 200 and/or system 100.
  • Method 900-b may be used, for example, by eNBs 105 illustrated in FIG. 1 and/or FIG. 2 for performing UL HARQ retransmissions during subframes with the same interference profile (e.g., DL-UL interference or UL-UL
  • Method 900-b may be performed by each UL HARQ process of the eNBs 105.
  • Method 900-b may begin at block 935, where an UL HARQ process at the serving cell may receive an UL data transmission during an UL subframe.
  • the serving cell may not be able to correctly decode the UL data transmission and may transmit a NACK to the UE for the data transmission at block 940.
  • the serving cell may determine TDD UL- DL configurations of possibly interfering cells. For example, the serving cell may receive TDD UL-DL configurations from neighboring cells or may detect TDD UL-DL
  • the serving cell may select an UL subframe for receiving a retransmission having the same interference profile as the UL subframe of the original data transmission in block 935.
  • the serving cell may also determine the UL sub frame for retransmission according to other synchronous UL HARQ rules (e.g., at least 4 subframes after transmitting NACK, etc.).
  • the serving cell may determine whether there is a scheduled data transmission on the selected UL sub frame from block 950. If a data transmission is already scheduled on the selected subframe, method 900-b may return to block 945 to select a new UL subframe for receiving the retransmission based on the TDD UL-DL configurations of interfering cells.
  • the serving cell may receive the retransmission on the selected UL subframe at block 960.
  • the UL HARQ process may be repeated from block 940 if the data being transmitted in the UL HARQ process is still not able to be decoded correctly at block 960.
  • FIGS. 8 A, 8B, 8C, 9A, and 9B illustrate techniques for modifying synchronous UL HARQ timing.
  • the principles of these techniques may be applied to asynchronous UL HARQ as well.
  • the serving cell may follow the timing illustrated above with reference to FIGS. 8A, 8B, and/or 8C in scheduling UL retransmissions for
  • FIG. 10 illustrates a system 1000 for performing UCI shift and/or modifying synchronous UL HARQ timing in accordance with various embodiments.
  • System 1000 includes an eNB 105-h and UE 115-d.
  • the eNB 105-h may be an example of the eNBs 105 illustrated in FIG. 1 and/or FIG. 2.
  • the UE 115-d may be an example of the UEs 115 illustrated in FIG. 1 and/or FIG. 2.
  • eNB 105-h and UE 1 15-d are each illustrated with a single antenna, however, they may have multiple antennas
  • the eNB 105-h may include TDD configuration processor 1005, DL HARQ/UCI processor 1010, UL HARQ processor, modulator/demodulator 1020, memory 1030, scheduler 1035, transmitter/receiver 1040 and antenna(s) 1042. Each of these components may be connected to each other.
  • DL HARQ/UCI processor 1010 may, in coordination with scheduler 1035 and TDD configuration processor 1005, schedule DL transmissions and receive UCI associated with DL data transmissions. For example, DL HARQ/UCI processor 1010 may receive
  • DL HARQ/UCI processor 1010 may determine TDD UL/DL configurations for one or more adjacent and/or interfering cells. For example, DL
  • HARQ/UCI processor 1010 may receive (e.g., via backhaul) the TDD UL/DL configurations for neighboring cells and/or detect the TDD UL/DL configurations of neighboring cells from transmitted signals (e.g., detecting reference signals, etc.).
  • DL HARQ/UCI processor 1010 may determine reduced interference UL subframes based on TDD UL/DL configurations of the eNB 105-h and one or more interfering cells. For example, DL HARQ/UCI processor 1010 may determine common UL subframes between the serving cell TDD UL/DL configuration and the TDD UL/DL configurations of potentially interfering cells.
  • DL HARQ/UCI processor 1010 may receive the UCI in the reduced interference UL subframes.
  • UL HARQ processor 1015 may perform the operations for one or more UL HARQ processes.
  • UL HARQ processor 1015 may receive UL data transmissions from
  • UL HARQ processor 1015 may transmit a NACK to the UE for the incorrectly decoded data transmissions.
  • UL HARQ processor 1015 may determine TDD UL-DL configurations of possibly interfering cells. For example, the UL HARQ processor 1015 may receive TDD UL-DL configurations from neighboring cells or may detect TDD UL-DL configurations of neighboring cells.
  • UL HARQ processor 1015 may select UL subframes for receiving retransmissions having the same interference profiles as the UL subframes of the original data transmissions.
  • UL HARQ processor 1015 may also determine the UL sub frame for retransmission according to other synchronous UL HARQ rules (e.g., at least 4 subframes after transmitting NACK, priority of scheduled UL transmissions, etc.).
  • the UE 115-d may include DL HARQ/UCI processor 1055, UL HARQ processor 1060, modulator/demodulator 1050, memory 1070, transmitter/receiver 1045, and antenna(s) 1044. Each of these components may be connected to each other.
  • DL HARQ/UCI processor 1055 may determine UCI for transmission to a serving cell. For example, SRS, CSI, CQI, RI, PMI, SR, and/or DL HARQ ACK/NACK information may be determined by the UE for transmission and may be scheduled for transmission during subframes determined according to various UCI transmission schedules. DL HARQ/UCI processor 1055 may determine TDD UL/DL configurations for one or more adjacent and/or interfering cells. DL HARQ/UCI processor 1055 may determine reduced interference UL sub frames for transmission of the UCI.
  • DL HARQ/UCI processor 1055 may determine the reduced interference UL sub frames based on TDD UL/DL configurations of the serving cell and one or more interfering cells. Alternatively, DL HARQ/UCI processor 1055 may determine the reduced interference UL sub frames based on one or more subframes that are UL subframes of a set of available TDD UL/DL
  • DL HARQ/UCI processor 1055 may select a reduced interference UL subframe for transmission of the UCI and transmit the UCI on the selected reduced interference UL subframe to the eNB 105-h.
  • UL HARQ processor 1060 may perform multi-process synchronous UL HARQ according to the modified synchronous UL HARQ timing described above. For example, UL HARQ processor 1060 may perform data transmissions during UL subframes and receive ACK/NACK information from the serving cell (e.g., eNB 105-h). When NACKs are received for UL transmissions, UL HARQ processor 1060 may select UL subframes for retransmission having the same interference profile as the UL subframe of the original data transmissions.
  • the UL HARQ processor 1060 may select the UL subframes for retransmission based on the TDD UL-DL configurations for the possibly interfering cells. Where the TDD UL-DL configurations for possibly interfering cells are unknown, the UL HARQ processor 1060 may select the same numbered UL subframes for retransmission as the original transmissions. UL HARQ processor 1060 may also determine the UL subframes for retransmission according to other synchronous UL HARQ rules (e.g., at least 4 subframes after receiving NACK, priority of scheduled UL transmissions, etc.).
  • other synchronous UL HARQ rules e.g., at least 4 subframes after receiving NACK, priority of scheduled UL transmissions, etc.
  • the UL HARQ processor 1060 may perform the retransmissions on the selected UL subframes.
  • Modulators/demodulators 1020, 1050 may process a respective output symbol stream (e.g., for OFDM, SC-FMDA, etc.) to obtain an output sample stream.
  • Each modulator/demodulator 1020, 1050 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink (DL) signal.
  • DL signals from modulators/demodulators 1020, 1050 may be transmitted via the transmitter/receivers 1040, 1045 and antennas 1042, 1044, respectively, according to a particular TDD Uplink/Downlink configuration.
  • Modulators/demodulators 1020, 1050 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal from transmitter/receivers 1040, 1045 and antennas 1042, 1044 to obtain input samples.
  • condition e.g., filter, amplify, downconvert, and digitize
  • Modulators/demodulators 1020, 1050 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols.
  • FIG. 11 shows a block diagram of a design of DL HARQ/UCI processor 1055 in accordance with various embodiments.
  • DL HARQ/UCI processor 1055 may include uplink control information module 1110, reduced interference UL subframe module 1120, and/or UCI transmission module 1130. Each of these components may be in communication with each other.
  • Uplink control information module 1110 may determine UCI for transmission to a serving cell during UL subframes.
  • Reduced interference UL subframe module 1120 may determine reduced interference UL subframes. Where TDD UL-DL configurations of possibly interfering cells are known, reduced interference UL subframe module 1120 may determine reduced interference UL subframes based on the TDD UL-DL configuration of the serving cell and the TDD UL-DL configurations of the possibly interfering cells. Where TDD UL-DL configurations of possibly interfering cells are unknown, reduced interference UL subframe module 1120 may determine reduced interference UL subframes based on the TDD UL-DL configuration of the serving cell and the set of available TDD UL-DL configurations for interfering cells.
  • FIG. 12 shows a block diagram of a design of UL HARQ processor 1060 in accordance with various embodiments.
  • UL HARQ processor 1060 may include ACK/NACK processing module 1210, UL retransmission subframe module 1220, and TDD configuration module 1230. Each of these components may be in communication with each other.
  • ACK/NACK processing module 1210 may receive and process ACK/NACK information in a multi-process UL HARQ operation.
  • UL retransmission subframe module 1220 may select UL subframes for retransmission of data transmissions for which NACKs are received.
  • UL retransmission subframe module 1220 may select UL subframes for retransmissions having the same interference profile as the UL subframes of the original data transmissions.
  • TDD configuration module 1230 may determine TDD UL- DL configurations for possibly interfering cells. The UL retransmission subframe module 1220 may select the UL subframes for retransmission based on the TDD UL-DL configurations for the possibly interfering cells.
  • the UL retransmission subframe module 1220 may select the same numbered UL subframes for retransmission as the original transmissions. UL retransmission subframe module 1220 may also determine the UL subframes for
  • retransmission according to other synchronous UL HARQ rules e.g., at least 4 subframes after receiving NACK, priority of scheduled UL transmissions, etc.
  • FIG. 13 shows a block diagram of a design of DL HARQ/UCI processor 1010 of a serving cell in accordance with various embodiments.
  • DL HARQ/UCI processor 1010 may include data transmission module 1310, reduced interference UL subframe module 1320, and UCI decoding module 1330. Each of these components may be in communication with each other.
  • Data transmission module 1310 may transmit DL data transmissions to UEs in DL subframes of TDD carriers.
  • Reduced interference UL subframe module 1320 may determine reduced interference UL subframes for receiving UCI from the UEs associated with the DL data transmissions.
  • Reduced interference UL subframe module 1320 may determine the reduced interference UL subframes based on TDD UL/DL configurations the serving cell and one or more interfering cells.
  • reduced interference UL subframe module 1320 may determine the reduced interference UL subframes based on TDD UL/DL configurations of the serving cell and one or more interfering cells.
  • reduced interference UL subframe module 1320 may determine the reduced interference UL subframes based on one or more subframes that are UL subframes of a set of available TDD UL/DL configurations.
  • UCI decoding module 1330 may decode the UCI received on the reduced interference UL subframes.
  • FIG. 14 shows a block diagram of a design of UL HARQ processor 1015 of a serving cell in accordance with various embodiments.
  • UL HARQ processor 1015 may include UL data processing module 1410, UL ACK/NACK transmission module 1420, and UL retransmission subframe module 1430. Each of these components may be in
  • UL data processing module 1410 may receive and process UL data transmissions from UEs in a multi-process UL HARQ operation.
  • UL ACK/NACK transmission module 1420 may transmit ACK/NACK information for received UL subframes.
  • UL ACK/NACK transmission module 1420 may transmit NACKs for UL sub frames not decoded correctly by UL data processing module 1410.
  • UL retransmission sub frame module 1430 may select UL subframes for receiving retransmissions from UEs having the same interference profile as the UL subframes of the original data transmissions.
  • UL retransmission sub frame module 1430 may select the UL subframes for retransmission based on the TDD UL-DL configurations for the possibly interfering cells. Where the TDD UL-DL configurations for possibly interfering cells are unknown, the UL retransmission sub frame module 1430 may select the same numbered UL subframes for retransmission as the original transmissions. UL retransmission sub frame module 1430 may also determine the UL subframes for retransmission according to other synchronous UL HA Q rules (e.g., at least 4 subframes after receiving NACK, priority of scheduled UL transmissions, etc.). UL data processing module 1410 may receive the retransmitted UL subframes.
  • FIGS. 1 1 , 12, 13 and/or 14 may, individually or collectively, be implemented with one or more application-specific integrated circuits (ASICs) adapted to perform some or all of the applicable functions in hardware.
  • ASICs application-specific integrated circuits
  • the functions may be performed by one or more other processing units (or cores), on one or more integrated circuits.
  • other types of integrated circuits may be used (e.g.,
  • each unit may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or application-specific processors.
  • FIG. 15 is a block diagram 1500 of a mobile device 1 15-e configured for performing UCI shift and/or modifying synchronous UL HARQ timing in accordance with various embodiments.
  • the mobile device 1 15-e may have any of various configurations, such as personal computers (e.g., laptop computers, netbook computers, tablet computers, etc.), cellular telephones, PDAs, smartphones, digital video recorders (DVRs), internet appliances, gaming consoles, e-readers, etc.
  • the mobile device 1 15-e may have an internal power supply (not shown), such as a small battery, to facilitate mobile operation.
  • the mobile device 1 15-e may be the mobile devices 1 15 of FIG. 1 , FIG. 2, and/or FIG. 10.
  • the mobile device 1 15-e may generally include components for bi-directional voice and data communications including components for transmitting communications and components for receiving communications.
  • the mobile device 1 15-e may include a transceiver module 1510, antenna(s) 1505, memory 1580, and a processor module 1570, which each may communicate, directly or indirectly, with each other (e.g., via one or more buses).
  • the transceiver module 1510 is configured to communicate bi-directionally, via the antenna(s) 1505 and/or one or more wired or wireless links, with one or more networks, as described above.
  • the transceiver module 1510 may be configured to communicate bi-directionally with base stations 105 of FIG. 1 , FIG. 2, and/or FIG. 10.
  • the transceiver module 1510 may include a modem configured to modulate the packets and provide the modulated packets to the antenna(s) 1505 for transmission, and to demodulate packets received from the antenna(s) 1505. While the mobile device 1 15-e may include a single antenna 1505, the mobile device 1 15-c may have multiple antennas 1505 capable of concurrently transmitting and/or receiving multiple wireless transmissions. The transceiver module 1510 may be capable of concurrently communicating with multiple eNBs 105 via multiple component carriers.
  • the memory 1580 may include random access memory (RAM) and read-only memory (ROM).
  • the memory 1580 may store computer-readable, computer-executable software/firmware code 1585 containing instructions that are configured to, when executed, cause the processor module 1570 to perform various functions described herein (e.g., call processing, database management, capture of handover delay, etc.).
  • the software/firmware code 1585 may not be directly executable by the processor module 1570 but be configured to cause a computer (e.g. , when compiled and executed) to perform functions described herein.
  • the processor module 1570 may include an intelligent hardware device, e.g., a central processing unit (CPU) such as those made by Intel® Corporation or AMD®, a microcontroller, an application-specific integrated circuit (ASIC), etc.
  • the mobile device 1 15-e may include a speech encoder (not shown) configured to receive audio via a microphone, convert the audio into packets (e.g., 20 ms in length, 30 ms in length, etc.) representative of the received audio, provide the audio packets to the transceiver module 1510, and provide indications of whether a user is speaking.
  • a speech encoder not shown
  • the mobile device 115-e may further include communications management module 1560, handover module 1565, uplink control information module 1110-a, reduced interference UL sub frame module 1120-a, UCI transmission module 1130-a, ACK/NACK processing module 1210-a, UL retransmission subframe module 1220-a, and/or TDD configuration module 1230-a.
  • these modules may be components of the mobile device 115-e in communication with some or all of the other components of the mobile device 115-e via a bus.
  • functionality of these modules may be implemented as a component of the transceiver module 1510, as a computer program product, and/or as one or more controller elements of the processor module 1570.
  • handover module 1565 may be utilized to perform handover procedures of the mobile device 115-e from one base station 105 to another.
  • the handover module 1565 may perform a handover procedure of the mobile device 115-e from one base station to another where voice and/or data communications are being received from the base stations.
  • the mobile device 115-e may be configured to support UCI shifting and/or modifying of synchronous UL HA Q timing as described above.
  • the components for mobile device 115-e may be configured to implement aspects discussed above with respect to UEs 115 of FIG. 1, FIG. 2, and/or FIG. 10 and may not be repeated here for the sake of brevity.
  • the uplink control information module 1110-a may be an example of one or more aspects of the uplink control information module 1110
  • reduced interference UL subframe module 1120-a may be an example of one or more aspects of the reduced interference UL subframe module 1120
  • UCI transmission module 1130-a may be an example of one or more aspects of the UCI transmission module 1130
  • ACK/NACK processing module 1210-a may be an example of one or more aspects of the ACK/NACK processing module 1210
  • UL retransmission subframe module 1220-a may be an example of one or more aspects of the UL retransmission subframe module 1220-a
  • TDD configuration module 1230-a may be an example of one or more aspects of the TDD configuration module 1230.
  • FIG. 16 shows a block diagram of a communications system 1600 that may be configured for performing UCI shift and/or modifying synchronous UL HARQ timing in accordance with various embodiments.
  • This system 1600 may be an example of aspects of the systems 100 and/or 200 depicted in FIG. 1 and/or FIG. 2.
  • the system 1600 includes a base station 105-i configured for communication with UE 1 15 over wireless communication links 125.
  • Base station 105-i may be capable of receiving communication links 125 from other base stations such as base station 105-j.
  • Base station 105-i may be, for example, an eNB 105 as illustrated in systems 100 and/or 200.
  • the base station 105-i may have one or more wired backhaul links.
  • Base station 105-i may be, for example, a macro eNB 105 having a wired backhaul link (e.g., S I interface, etc.) to the core network 130-a.
  • Base station 105-i may also communicate with other base stations 105, such as base station 105-m and base station 105-n via inter-base station communication links (e.g., X2 interface, etc.).
  • Each of the base stations 105 may communicate with UEs 1 15 using different wireless communications technologies, such as different Radio Access Technologies.
  • base station 105-i may communicate with other base stations such as 105-m and/or 105-n utilizing base station communication module 1615.
  • base station communication module 1615 may provide an X2 interface within an LTE/LTE-A wireless communication network technology to provide communication between some of the base stations 105.
  • base station 105-i may communicate with other base stations through core network 130-a.
  • the base station 105-i may communicate with the core network 130-a through network communications module 1665.
  • the components for base station 105-i may be configured to implement aspects discussed above with respect to base stations 105 of FIG. 1 , FIG. 2, and/or FIG. 10 and may not be repeated here for the sake of brevity.
  • the data transmission module 1310-a may be an example of one or more aspects of the data transmission module 1310
  • the reduced interference UL sub frame module 1320-a may be an example of one or more aspects of the reduced interference UL subframe module 1320
  • the UCI decoding module 1330-a may be an example of one or more aspects of the UCI decoding module 1330
  • UL data processing module 1410-a may be an example of one or more aspects of the UL data processing module 1410
  • UL ACK/NACK transmission module 1420-a may be an example of one or more aspects of the UL ACK/NACK transmission module 1420
  • UL retransmission subframe module 1430-a may be an example of one or more aspects of the UL retransmission subframe module 1430.
  • these modules may be components of the base station 105-i in communication with some or all of the other components of the base station 105-i via bus system 1680.
  • functionality of these modules may be implemented as a component of the transceiver module 1650, as a computer program product, and/or as one or more controller elements of the processor module 1660.
  • the base station 105-i may include antennas 1645, transceiver modules 1650, memory 1670, and a processor module 1660, which each may be in communication, directly or indirectly, with each other (e.g., over bus system 1680).
  • the transceiver modules 1650 may be configured to communicate bi-directionally, via the antennas 1645, with the user equipment 115, which may be a multi-mode user equipment.
  • the transceiver module 1650 (and/or other components of the base station 105-i) may also be configured to communicate bi-directionally, via the antennas 1645, with one or more other base stations 105-j.
  • the transceiver module 1650 may include a modem configured to modulate the packets and provide the modulated packets to the antennas 1645 for transmission, and to demodulate packets received from the antennas 1645.
  • the base station 105-i may include multiple transceiver modules 1650, each with one or more associated antennas 1645.
  • the memory 1670 may include random access memory (RAM) and read-only memory (ROM).
  • the memory 1670 may also store computer-readable, computer-executable software code 1675 containing instructions that are configured to, when executed, cause the processor module 1660 to perform various functions described herein (e.g., call processing, database management, message routing, etc.).
  • the software 1675 may not be directly executable by the processor module 1660 but be configured to cause the computer, e.g., when compiled and executed, to perform functions described herein.
  • the processor module 1660 may include an intelligent hardware device, e.g., a central processing unit (CPU) such as those made by Intel® Corporation or AMD®, a microcontroller, an application-specific integrated circuit (ASIC), etc.
  • the processor module 1160 may include various special purpose processors such as encoders, queue processing modules, base band processors, radio head controllers, digital signal processors (DSPs), and the like.
  • the base station 105-i may further include a communications management module 1630.
  • the communications management module 1630 may manage communications with other base stations 105.
  • the communications management module may include a controller and/or scheduler for controlling
  • the communications management module 1630 may perform scheduling for transmissions to UEs 115 and/or various interference mitigation techniques such as beamforming and/or joint transmission.
  • Information and signals may be represented using any of a variety of different technologies and techniques.
  • data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA field programmable gate array
  • a general-purpose processor may be a
  • processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • Computer-readable media includes both computer storage media and
  • a storage medium may be any available medium that can be accessed by a general-purpose or special-purpose computer.
  • computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special- purpose computer, or a general-purpose or special-purpose processor.
  • any connection is properly termed a computer-readable medium.
  • Disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

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Abstract

Selon cette invention, les effets du brouillage de la liaison descendante à la liaison montante sont atténués dans les systèmes TDD par adaptation de la temporisation des informations de commande de liaison montante et de la retransmission HARQ UL. Dans certains modes de réalisation, les informations de commande de liaison montante peuvent être déplacées jusqu'à des secteurs de trame qui subissent un brouillage de liaison descendante plus faible provenant d'autres cellules. Dans certains modes de réalisation, la temporisation HARQ UL est modifiée de sorte que les transmissions et retransmissions UL aient des profils de brouillage similaires. Selon des modes de réalisation, la HARQ UL non synchronisée peut servir à ordonnancer les retransmissions dans des secteurs de trame UL avec des profils de brouillage similaires à la transmission d'origine (par exemple un brouillage UL-UL, un brouillage DL-UL, etc.). Dans d'autres modes de réalisation, la temporisation HARQ UL synchrone modifiée adapte la retransmission afin qu'elle ait lieu sur des secteurs de trame UL ayant des profils de brouillage similaires à la transmission, sur la base de la configuration UL-DL TDD de la cellule de desserte et/ou des cellules provoquant le brouillage.
PCT/CN2013/000083 2013-01-28 2013-01-28 Déplacement d'uci et nouvelle temporisation pusch permettant de lutter contre le brouillage dl-ul dans l'eimta WO2014113902A1 (fr)

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CN113079574A (zh) * 2014-08-15 2021-07-06 交互数字专利控股公司 时分双工的覆盖增强和长期演进系统中增强的干扰减轻和业务适配
TWI739791B (zh) * 2016-02-09 2021-09-21 美商蘋果公司 擴展對於非正交多重存取的選擇之技術
JP2022043101A (ja) * 2014-01-30 2022-03-15 クゥアルコム・インコーポレイテッド 動的ｔｄｄ ｄｌ／ｕｌサブフレーム構成を有するキャリアアグリゲーション
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