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WO2014110801A1 - Procédé et appareil pour prendre en charge une reconfiguration liaison montante/liaison descendante à duplexage par répartition temporelle - Google Patents

Procédé et appareil pour prendre en charge une reconfiguration liaison montante/liaison descendante à duplexage par répartition temporelle Download PDF

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Publication number
WO2014110801A1
WO2014110801A1 PCT/CN2013/070704 CN2013070704W WO2014110801A1 WO 2014110801 A1 WO2014110801 A1 WO 2014110801A1 CN 2013070704 W CN2013070704 W CN 2013070704W WO 2014110801 A1 WO2014110801 A1 WO 2014110801A1
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WO
WIPO (PCT)
Prior art keywords
tdd
configuration
configurations
program code
harq timeline
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2013/070704
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English (en)
Inventor
Jing HAN
Haiming Wang
Chunyan Gao
Lili Zhang
Wei Hong
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Broadcom Corp
Original Assignee
Broadcom Corp
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Filing date
Publication date
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Priority to PCT/CN2013/070704 priority Critical patent/WO2014110801A1/fr
Publication of WO2014110801A1 publication Critical patent/WO2014110801A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames

Definitions

  • An example embodiment of the present invention relates generally to wireless communications and, more generally, to time division duplex uplink/downlink reconfiguration.
  • a time division duplex (TDD) system permits asymmetric uplink
  • UL/downlink (DL) allocation For example, the asymmetric resource allocation in a long term evolution (LTE) TDD system is supported by seven different semi-statically configured UL/DL configurations. These configurations provide between 40% and 90% DL subframes.
  • LTE long term evolution
  • a base station may provide system information, such as via system information block 1 (SIB1), to identify the TDD UL/DL configuration to the mobile terminals operating within a cell.
  • SIB1 system information block 1
  • the traffic supported by a cell may fluctuate frequently, such as due to a relatively small number of active mobile terminals per cell.
  • the TDD UL/DL configuration may be reconfigured to adapt to the traffic.
  • TDD UL/DL reconfiguration several different time scales for such reconfiguration have been considered in relation to the various deployment scenarios. For example, in an instance in which multiple pico cells are under the coverage of a macro cell, a fast TDD UL/DL reconfiguration that will result in a fast interference change and fast inter-base station coordination may not be available.
  • signaling of the TDD UL/DL reconfiguration within the physical (PHY) layer supports TDD UL/DL reconfiguration with a time scale of adaptation on the order of ten milliseconds (ms).
  • the TDD UL/DL configuration or the transmission direction of a subframe can be explicitly indicated by the physical channel or signal or the transmission direction of a subframe can be implicitly derived by the mobile terminal based upon the base station scheduling and configurations for uplink transmissions.
  • a subframe that is a downlink subframe in the initial TDD UL/DL configuration as may be defined, for example, by
  • SIB 1 cannot be changed to an uplink subframe by the TDD UL/DL reconfiguration since a legacy TDD mobile terminal would not appreciate the reconfiguration and would otherwise monitor the frame originally indicated to be a DL subframe, such as for common reference signals (CRS) including, for example, radio resource management
  • CRS common reference signals
  • RRM channel state information
  • CSI channel state information
  • TDD UL/DL configurations associated with each of the initial TDD UL/DL configurations are shown below in Table 2, along with the resulting TDD UL/DL configuration set formed by the combination of the initial TDD UL/DL configuration and the additional TDD UL/DL configurations.
  • the various TDD UL/DL configurations are referenced in terms of the seven predefined TDD UL/DL configurations for an LTE TDD system.
  • the base station may reconfigure the TDD UL/DL configuration to be TDD UL/DL configurations 1 , 2 or 6 in subsequent subframes for mobile terminals that support flexible TDD UL/DL configurations, while the legacy mobile terminals that do not support flexible TDD UL/DL configurations will continue to operate in accordance with TDD UL/DL configuration 0.
  • each of TDD UL/DL configurations 0, 1, 2 and 6 have the same DL subframes so that the legacy mobile terminals can operate effectively, even in an instance in with the TDD UL/DL configuration changes with the TDD configuration set.
  • a base station may signal the TDD UL/DL reconfiguration via, for example, the radio resource control (RRC), media access control (MAC) or PHY layers.
  • RRC radio resource control
  • MAC media access control
  • PHY PHY layer
  • the PHY layer signaling can be provided either explicitly or implicitly with implicit PHY signaling generally being more flexible and requiring less signaling overheard. While straightforward, explicit signaling increases signaling overhead and may create additional error case handling. In contrast, implicit signaling permits a mobile terminal to determine the TDD UL/DL configuration based upon, for example, the scheduling grant. However, the link direction of a subframe may only be determined by a mobile terminal after grant detection. Thus, prior to grant detection, a mobile terminal must assume that each frame (other than subframe 2 which is fixed as an UL subframe) is a DL subframe and detect PDCCH in the respective subframe unless a UL grant has been detected for the respective subframe, thereby potentially consuming additional power.
  • a mobile terminal will be unable to determine whether the respective subframe is a DL subframe or a UL subframe, such that the mobile terminal may be unable to utilize the respective subframe for measurement purposes.
  • TDD UL/DL configurations since there will be additional uncertainty in regard to the link direction of the subframes.
  • SIB1 indicates that the cell will initially operate in accordance with TDD UL/DL configuration 0
  • the mobile terminal may determine that subframes 3, 4, 8 and 9 can be either DL subframes or UL subframes since the additional TDD UL/DL configurations to which the cell may be reconfigured from TDD UL/DL configuration 0 may include TDD UL/DL configurations 1 , 2 and 6, as shown in Table 1 above.
  • the mobile terminal of this example may allow for PDCCH detection in all of subframes 0, 1, 3, 4, 5, 6, 8 and 9 since subframes 0, 1, 5 and 6 are indicated to be DL subframes for TDD UL/DL configuration 0 and subframes 3, 4, 8 and 9 may be defined as DL subframe by TDD UL/DL configurations 1 , 2 and 6 unless an uplink grant has been detected for one or more of the subframes.
  • the mobile terminal may expend an undesirable amount of power.
  • these same subframes generally cannot be utilized for DL measurement if no DL grant was detected in the respective subframe since a mobile terminal is unsure as to whether the respective subframe is a UL or DL subframe.
  • the HARQ timeline is dependent upon a TDD UL/DL configuration.
  • the HARQ timeline is also changed frequently, which may result in larger loss by HARQ.
  • the HARQ timeline may be changed frequently, which may result in larger loss by HARQ.
  • loss attributable to the HARQ timeline change may be significant.
  • the HARQ timeline may be fixed with all feedback and grants located in a fixed subframe, such as DL subframe 0, 1, 5 and 6 and UL subframes 2 and 7.
  • the HARQ timeline of this proposal would be such that its DL subframes track the timing of TDD UL/DL configuration 2 and its UL subframes track the timing of TDD UL/DL configuration 0.
  • this proposal may undesirably limit the TDD UL/DL reconfiguration since a requirement that the DL subframes always track TDD UL/DL configuration 2 results in an inability to reconfigure the TDD UL/DL configuration to be TDD UL/DL configurations 3, 4 or 5 since subframe 7 of TDD UL/DL configurations 3, 4 and 5 is a DL subframe. Additionally, inclusion of all feedback and grants in fixed subframes may result in control overload for the fixed subframes. Furthermore, in an instance in which the uplink feedback is limited to only a fixed uplink subframe, there may be additional bundling loss which may decrease the downlink throughput.
  • a method, apparatus and computer program product are provided in accordance with an example embodiment of the present invention in order to support TDD UL/DL reconfiguration, such as to adapt to traffic within a respective cell.
  • a method, apparatus and computer program product are provided in order to identify the TDD UL/DL configuration to be utilized by a cell in a manner that reduces signaling overhead and error case handling, such as by implicit PHY signaling.
  • a method, apparatus and computer program are provided to identify a reference configuration for the HARQ timeline, either via explicit or implicit signaling, so as to reduce the loss because of a HARQ timeline change in conjunction with a TDD UL/DL reconfiguration.
  • a method in one embodiment, includes identifying one or more second time division duplex (TDD) uplink (UL)/downlink (DL) configurations from among one or more TDD UL/DL configuration candidates associated with a first TDD UL/DL configuration that has been previously configured by system information.
  • the method of this embodiment also causes the one or more second TDD UL/DL configurations that have been identified to be signaled to a mobile terminal. Thereafter, the method of this embodiment operates in accordance with a second TDD UL/DL configuration that has been identified.
  • an apparatus in another embodiment, includes at least one processor and at least one memory including computer program code with the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to identify one or more second time division duplex (TDD) uplink (UL)/downlink (DL) configurations from among one or more TDD UL/DL configuration candidates associated with a first TDD UL/DL configuration that has been previously configured by system information.
  • TDD time division duplex
  • UL uplink
  • DL downlink
  • the at least one memory and the computer program code are also configured to, with the at least one processor, cause the apparatus of this embodiment to cause the one or more second TDD UL/DL configurations that have been identified to be signaled to a mobile terminal and to thereafter operate in accordance with a second TDD UL/DL configuration that has been identified.
  • a computer program product includes at least one non-transitory computer-readable storage medium having computer- executable program code portions stored therein with the computer-executable program code portions including program code instructions for identifying one or more second time division duplex (TDD) uplink (UL)/downlink (DL) configurations from among one or more TDD UL/DL configuration candidates associated with a first TDD UL/DL configuration that has been previously configured by system information.
  • the computer- executable program code portions of this embodiment also include program code instructions for causing the one or more second TDD UL/DL configurations that have been identified to be signaled to a mobile terminal and for operating in accordance with a second TDD UL/DL configuration that has been identified.
  • an apparatus in yet another embodiment, includes means for identifying one or more second time division duplex (TDD) uplink (UL)/downlink (DL) configurations from among one or more TDD UL/DL configuration candidates associated with a first TDD UL/DL configuration that has been previously configured by system information.
  • the apparatus of this embodiment also includes means for causing the one or more second TDD UL/DL configurations that have been identified to be signaled to a mobile terminal. Further, the apparatus of this embodiment includes means for thereafter operating in accordance with a second TDD UL/DL configuration that has been identified.
  • a method in one embodiment, includes determining a first time division duplex (TDD) uplink (UL)/downlink (DL) configuration based upon system information. The method of this embodiment also includes receiving an indication of one or more second TDD UL/DL configurations from among one or more TDD UL/DL configuration candidates associated with the first TDD UL/DL configuration that is based upon system information. Thereafter, the method includes identifying one of the one or more second TDD UL/DL configurations and operating in accordance with the second TDD UL/DL configuration that has been identified.
  • TDD time division duplex
  • UL uplink
  • DL downlink
  • an apparatus in another embodiment, includes at least one processor and at least one memory including computer program code with the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to determine a first time division duplex (TDD) uplink (UL)/downlink (DL) configuration based upon system information.
  • TDD time division duplex
  • UL uplink
  • DL downlink
  • the at least one memory and the computer program code are also configured to, with the at least one processor, cause the apparatus of this embodiment to receive an indication of one or more second TDD UL/DL configurations from among one or more TDD UL/DL configuration candidates associated with the first TDD UL/DL configuration that is based upon system information, identify one of the one or more second TDD UL/DL configurations and to thereafter operate in accordance with the second TDD UL/DL configuration that has been identified.
  • a computer program product includes at least one non-transitory computer-readable storage medium having computer- executable program code portions stored therein with the computer-executable program code portions including program code instructions for determining a first time division duplex (TDD) uplink (UL)/downlink (DL) configuration based upon system information.
  • TDD time division duplex
  • UL uplink
  • DL downlink
  • the computer-executable program code portions of this embodiment also include program code instructions for receiving an indication of one or more second TDD UL/DL configurations from among one or more TDD UL/DL configuration candidates associated with the first TDD UL/DL configuration that is based upon system information, for identifying one of the one or more second TDD UL/DL configurations and for thereafter operating in accordance with the second TDD UL/DL configuration that has been identified.
  • an apparatus in yet another embodiment, includes means for determining a first time division duplex (TDD) uplink (UL)/downlink (DL) configuration based upon system information.
  • the apparatus of this embodiment also includes means for receiving an indication of one or more second TDD UL/DL configurations from among one or more TDD UL/DL configuration candidates associated with the first TDD UL/DL configuration that is based upon system information.
  • the apparatus may further include means for identifying one of the one or more second TDD UL/DL configurations and means for operating in accordance with a second TDD UL/DL configuration that has been identified.
  • a method in one embodiment, includes causing a reference configuration for at least one of an uplink hybrid automatic repeat request (HARQ) timeline or a downlink HARQ timeline to be signaled.
  • the method of this embodiment also includes causing an effective period for the reference configuration to be signaled.
  • HARQ uplink hybrid automatic repeat request
  • an apparatus in another embodiment, includes at least one processor and at least one memory including computer program code with the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to cause a reference configuration for at least one of an uplink hybrid automatic repeat request (HARQ) timeline or a downlink HARQ timeline to be signaled.
  • the at least one memory and the computer program code are also configured to, with the at least one processor, cause the apparatus of this embodiment to cause an effective period for the reference configuration to be signaled.
  • HARQ uplink hybrid automatic repeat request
  • a computer program product includes at least one non-transitory computer-readable storage medium having computer- executable program code portions stored therein with the computer-executable program code portions including program code instructions for causing a reference configuration for at least one of an uplink hybrid automatic repeat request (HARQ) timeline or a downlink HARQ timeline to be signaled.
  • the computer-executable program code portions of this embodiment also include program code instructions for causing an effective period for the reference configuration to be signaled.
  • an apparatus in yet another embodiment, includes means for causing a reference configuration for at least one of an uplink hybrid automatic repeat request (HARQ) timeline or a downlink HARQ timeline to be signaled.
  • the apparatus of this embodiment also includes means for causing an effective period for the reference configuration to be signaled.
  • HARQ uplink hybrid automatic repeat request
  • a method in one embodiment, includes receiving an indication of a reference configuration for at least one of an uplink (UL) hybrid automatic repeat request (HARQ) timeline or a downlink (DL) HARQ timeline.
  • the method of this embodiment also includes receiving an indication of an effective period for the reference configuration and operating in accordance with the reference configuration for at least one of the UL HARQ timeline or the DL HARQ timeline during the effective period.
  • an apparatus in another embodiment, includes at least one processor and at least one memory including computer program code with the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to receive an indication of a reference configuration for at least one of an uplink (UL) hybrid automatic repeat request (HARQ) timeline or a downlink (DL) HARQ timeline.
  • the at least one memory and the computer program code are also configured to, with the at least one processor, cause the apparatus of this embodiment to receive an indication of an effective period for the reference configuration and operate in accordance with the reference configuration for at least one of the UL HARQ timeline or the DL HARQ timeline during the effective period.
  • a computer program product includes at least one non-transitory computer-readable storage medium having computer- executable program code portions stored therein with the computer-executable program code portions including program code instructions for receiving an indication of a reference configuration for at least one of an uplink (UL) hybrid automatic repeat request (HARQ) timeline or a downlink (DL) HARQ timeline.
  • the computer-executable program code portions of this embodiment also include program code instructions for receiving an indication of an effective period for the reference configuration and program code instructions for operating in accordance with the reference configuration for at least one of the UL HARQ timeline or the DL HARQ timeline during the effective period.
  • an apparatus in yet another embodiment, includes means for receiving an indication of a reference configuration for at least one of an uplink (UL) hybrid automatic repeat request (HARQ) timeline or a downlink (DL) HARQ timeline.
  • the apparauts of this embodiment also includes means for receiving an indication of an effective period for the reference configuration and means for operating in accordance with the reference configuration for at least one of the UL HARQ timeline or the DL HARQ timeline during the effective period.
  • Figure 1 is a schematic representation of a system including access point and one or more mobile terminals that may be specifically configured in accordance with an example embodiment of the present invention
  • Figure 2 is a block diagram of an apparatus that may be embodied by an access or a mobile terminal and that may be specifically configured in accordance with an example embodiment of the present invention
  • Figure 3 is a flow chart illustrating operations performed, such as by the apparatus of Figure 2 embodied as an access point, in accordance with an example embodiment to the present invention
  • Figure 4 illustrates an initial TDD UL/DL configuration, a second TDD UL/DL configuration and a resulting TDD UL/DL configuration following
  • Figure 5 illustrates an initial TDD UL/DL configuration, a second TDD UL/DL configuration and a resulting TDD UL/DL configuration following
  • Figure 6 is a flow chart illustrating operations performed, such as by the apparatus of Figure 2 embodied as a mobile terminal, in accordance with an example embodiment of the present invention
  • Figure 7 is a flow chart illustrating the operations performed, such as by the apparatus of Figure 2 embodied as an access point, in regard to the definition of a reference configuration for the HARQ timeline in accordance with an example embodiment of the present invention.
  • Figure 8 is a flow chart illustrating the operations performed, such as by the apparatus of Figure 2 embodied as a mobile terminal, in regard to the definition of a reference configuration for the HARQ timeline in accordance with an example embodiment of the present invention.
  • circuitry refers to all of the following: (a)hardware-only circuit implementations (such as implementations in only analog and/or digital circuitry) and (b) to combinations of circuits and software (and/or firmware), such as (as applicable): (i) to a combination of processor(s) or (ii) to portions of
  • processor(s)/software including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and (c) to circuits, such as a microprocessor(s) or a portion of a microprocessor(s), that require software or firmware for operation, even if the software or firmware is not physically present.
  • circuitry applies to all uses of this term in this application, including in any claims.
  • circuitry would also cover an implementation of merely a processor (or multiple processors) or portion of a processor and its (or their) accompanying software and/or firmware.
  • circuitry would also cover, for example and if applicable to the particular claim element, a baseband integrated circuit or application specific integrated circuit for a mobile phone or a similar integrated circuit in server, a cellular network device, or other network device.
  • a method, apparatus and computer program product are provided in accordance with an example embodiment of the present invention in order to support TDD UL/DL reconfiguration.
  • the TDD UL/DL reconfiguration supported by embodiments of the present invention may permit the TDD UL/DL configuration to adapt to traffic within a respective cell.
  • a method, apparatus and computer program product are provided in order to identify the TDD UL/DL
  • the method, apparatus and computer program product of this embodiment may provide power savings and measurement accuracy and may facilitate intercell interference coordination in conjunction with dynamic reconfiguration.
  • a method, apparatus and computer program are provided to identify a reference configuration for the HARQ timeline, either via explicit or implicit signaling, so as to reduce the loss because of a HARQ timeline change in conjunction with a TDD UL/DL reconfiguration.
  • a system that supports communications between a plurality of mobile terminals 10 (one of which is illustrated by way of example) and a network 14, such as an 802.11 network, a Long Term Evolution (LTE) network, an LTE- Advanced (LTE- A) network, a Global Systems for Mobile communications (GSM) network, a Code Division Multiple Access (CDMA) network, e.g., a Wideband CDMA (WCDMA) network, a CDMA2000 network or the like, a General Packet Radio Service (GPRS) network or other type of network, via an access point 12 is shown.
  • the network may be a non-uniform network, such as a non-uniform universal mobile
  • UMTS telecommunications systems
  • UTRAN terrestrial radio access network
  • LTE long term evolution
  • UMTS telecommunications systems
  • UTRAN terrestrial radio access network
  • Various types of mobile terminals may be employed including, for example, mobile communication devices or user equipment such as, for example, mobile telephones, smartphones, personal digital assistants (PDAs), pagers, laptop computers, tablet computers or any of numerous other hand held or portable communication devices, computation devices, content generation devices, content consumption devices, or combinations thereof.
  • PDAs personal digital assistants
  • laptop computers tablet computers or any of numerous other hand held or portable communication devices
  • computation devices computation devices
  • content generation devices content consumption devices, or combinations thereof.
  • the mobile terminal may communicate with the network via an access point, such as a base station, a Node B, an evolved Node B (eNB), a relay node or other type of access point.
  • an access point such as a base station, a Node B, an evolved Node B (eNB), a relay node or other type of access point.
  • eNB evolved Node B
  • the mobile terminal 10 and a network entity, such as the access point 12 may each embody or otherwise be associated with an apparatus 20 that is generally depicted in Figure 2 and that may be configured to perform various operations in accordance with an example embodiment of the present invention as described below, such as in conjunction with Figures 6 and 8 from the perspective of the mobile terminal and Figures 3 and 7 from the perspective of a network entity, such as the access point.
  • an apparatus 20 that is generally depicted in Figure 2 and that may be configured to perform various operations in accordance with an example embodiment of the present invention as described below, such as in conjunction with Figures 6 and 8 from the perspective of the mobile terminal and Figures 3 and 7 from the perspective of a network entity, such as the access point.
  • the components, devices or elements described below may not be mandatory and thus some may be omitted in certain embodiments. Additionally, some embodiments may include further or different components, devices or elements beyond those shown and described herein.
  • the apparatus 20 may include or otherwise be in communication with a processing system including, for example, processing circuitry 22 that is configurable to perform actions in accordance with example embodiments described herein.
  • the processing circuitry may be configured to perform data processing, application execution and/or other processing and management services according to an example embodiment of the present invention.
  • the apparatus or the processing circuitry may be embodied as a chip or chip set.
  • the apparatus or the processing circuitry may comprise one or more physical packages (e.g., chips) including materials, components and/or wires on a structural assembly (e.g., a baseboard).
  • the structural assembly may provide physical strength, conservation of size, and/or limitation of electrical interaction for component circuitry included thereon.
  • the apparatus or the processing circuitry may therefore, in some cases, be configured to implement an embodiment of the present invention on a single chip or as a single "system on a chip.”
  • a chip or chipset may constitute means for performing one or more operations for providing the functionalities described herein.
  • the processing circuitry 22 may include a processor 24 and memory 26 that may be in communication with or otherwise control a communication interface 28 and, in some cases in which the apparatus is embodied by the mobile terminal 10, a user interface 30.
  • the processing circuitry may be embodied as a circuit chip (e.g., an integrated circuit chip) configured (e.g., with hardware, software or a combination of hardware and software) to perform operations described herein.
  • the processing circuitry may be embodied as a portion of mobile terminal or the access point.
  • the user interface 30 may be in communication with the processing circuitry 22 to receive an indication of a user input at the user interface and/or to provide an audible, visual, mechanical or other output to the user.
  • the user interface may include, for example, a keyboard, a mouse, a joystick, a display, a touch screen, a microphone, a speaker, and/or other input/output mechanisms.
  • the user interface includes user interface circuitry configured to facilitate at least some functions of the station by receiving user input and providing output.
  • the communication interface 28 may include one or more interface mechanisms for enabling communication with other devices and/or networks.
  • the communication interface may be any means such as a device or circuitry embodied in either hardware, or a combination of hardware and software that is configured to receive and/or transmit data from/to a network 14 and/or any other device or module in communication with the processing circuitry 22, such as between the mobile terminal 10 and the access point 12.
  • the communication interface may include, for example, an antenna (or multiple antennas) and supporting hardware and/or software for enabling communications with a wireless communication network and/or a communication modem or other hardware/software for supporting communication via cable, digital subscriber line (DSL), universal serial bus (USB), Ethernet or other methods.
  • DSL digital subscriber line
  • USB universal serial bus
  • the memory 26 may include one or more non- transitory memory devices such as, for example, volatile and/or non-volatile memory that may be either fixed or removable.
  • the memory may be configured to store information, data, applications, instructions or the like for enabling the apparatus 20 to carry out various functions in accordance with example embodiments of the present invention.
  • the memory could be configured to buffer input data for processing by the processor 24.
  • the memory could be configured to store instructions for execution by the processor.
  • the memory may include one of a plurality of databases that may store a variety of files, contents or data sets.
  • applications may be stored for execution by the processor in order to carry out the functionality associated with each respective application.
  • the memory may be in communication with the processor via a bus for passing information among components of the apparatus.
  • the processor 24 may be embodied in a number of different ways.
  • the processor may be embodied as various processing means such as one or more of a microprocessor or other processing element, a coprocessor, a controller or various other computing or processing devices including integrated circuits such as, for example, an ASIC (application specific integrated circuit), an FPGA (field programmable gate array), or the like.
  • the processor may be configured to execute instructions stored in the memory 26 or otherwise accessible to the processor.
  • the processor may represent an entity (e.g., physically embodied in circuitry - in the form of processing circuitry) capable of performing operations according to embodiments of the present invention while configured accordingly.
  • the processor when the processor is embodied as an ASIC, FPGA or the like, the processor may be specifically configured hardware for conducting the operations described herein.
  • the processor when the processor is embodied as an executor of software instructions, the instructions may specifically configure the processor to perform the operations described herein.
  • An access point 12 and a mobile terminal 10 may initially be configured to communicate in accordance with a first Time Division Duplex (TDD) uplink (UL) / downlink (DL) configuration that defines the link direction of the various subframes such that the subframes are identified as being either an UL subframe or a DL subframe.
  • the first TDD UL/DL configuration may be established based upon system information that is transmitted from the access point to the mobile terminal that identifies the first TDD UL/DL configuration. Although the system information may be provided in a variety of different manners, the system information that defines the first TDD UL/DL
  • the first TDD UL/DL configuration may be provided by the system information block 1 (SIB 1).
  • SIB 1 system information block 1
  • the first TDD UL/DL configuration may be defined in various manners, the first TDD UL/DL configuration may be defined by the system information to be one of a plurality of predefined TDD UL/DL configurations, such as TDD UL/DL configuration 0, TDD UL/DL configuration 1, ... TDD UL/DL configuration 7.
  • Each of the predefined TDD UL/DL configurations has one or more TDD UL/DL configuration candidates that share the same, e.g., have common, DL subframes to facilitate backwards compatibility, as indicated above in Table 1.
  • the apparatus may include means, such as the processing circuitry 22, the processor 24 or the like, for identifying one or more second TDD UL/DL configurations from among the one or more TDD UL/DL configuration candidates associated with the first TDD UL/DL configuration.
  • the TDD UL/DL configuration candidates are TDD UL/DL configurations 1, 2 and 6.
  • the apparatus such as the processor, may identify, for example, TDD UL/DL configuration 1 or TDD UL/DL configurations 1 and 2 or TDD UL/DL configurations 1 , 2 and 6 as the second TDD UL/DL configuration from among the TDD UL/DL configuration candidates associated with the first TDD UL/DL configuration.
  • the apparatus 20 may also include means, such as the processing circuitry 22, the processor 24, the communications interface 28 or the like, for causing the one or more second TDD UL/DL configurations that have been identified to be signaled to a mobile terminal 10. See block 32 of Figure 3.
  • the one or more second TDD UL/DL See block 32 of Figure 3.
  • configurations may be signaled to the mobile terminal in various manners including with higher layer signaling, that is, signaling higher than physical layer signaling, such as RRC, MAC CE or system information, e.g., master information block (MIB) or SIB, signaling.
  • the apparatus of this embodiment may also include means, such as the processing circuitry, the processor or the like, for selecting and thereafter operating in accordance with one of the second TDD UL/DL configuration(s) that has been identified. See block 34.
  • the first TDD UL/DL configuration 40 may be TDD UL/DL configuration 0.
  • the TDD UL/DL configuration candidates associated with TDD UL/DL configuration 0 are TDD UL/DL configurations 1 , 2 and 6.
  • the apparatus 20 embodied by the access point 12, such as the processor 24, may identify TDD UL/DL configuration 1 to be the second TDD UL/DL configuration 42 from among the TDD UL/DL configuration candidate and may then cause the mobile terminal 10 to be signaled that TDD UL/DL configuration 1 is the second TDD UL/DL configuration.
  • TDD UL/DL configuration 1 differs from TDD UL/DL configuration 0 in that subframes 4 and 9 are UL subframes in TDD UL/DL configuration 0, but are DL subframes in TDD UL/DL configuration 1.
  • configuration 44 depicts subframes 4 and 9 as flexible subframes in that they had different link directions in the first and second TDD UL/DL configurations, but will be treated as DL subframes going forward as defined by the second TDD UL/DL
  • the mobile terminal may recognize that subframes 3 and 8 are UL subframes, both in the first TDD UL/DL configuration and in the second TDD UL/DL configuration.
  • the mobile terminal need not attempt to detect the PDCCH in subframes 3 and 8 so as to conserve power, but may, instead, send a report, such as a CQI report, in subframes 3 or 8 regardless of whether an UL grant for subframes 3 or 8 is detected.
  • the first TDD UL/DL configuration 40 that is configured by SIB 1 may be TDD UL/DL configuration 0 and TDD UL/DL configuration 2 may be the second TDD UL/DL configuration 46 that is identified and signaled to the mobile terminal 10 by the apparatus 20 embodied by the access point 12, such as the processor 24 and/or the communication interface 28.
  • TDD UL/DL configuration 2 differs from TDD UL/DL configuration 0 in that subframes 3, 4, 8 and 9 are UL subframes as defined by TDD UL/DL configuration 0, but are DL subframes as defined by TDD UL/DL configuration 2.
  • subframes 3, 4, 8 and 9 of the resulting TDD UL/DL configuration 48 are flexible subframes that will be treated as DL subframes consistent with the second TDD UL/DL configuration going forward, while subframes 0 and 5 being DL subframes and subframes 2 and 7 being UL subframes.
  • a mobile terminal that detects a DL grant in subframe 4 but not in subframe 3 may still treat both subframes 3 and 4 as DL subframes, such as by measuring the CSI for subframes 3 and 4, rather than only for subframe 4.
  • the second TDD UL/DL configuration 42, 46 was different than the first TDD UL/DL configuration 40.
  • the apparatus 20 embodied by the access point 12 may also include means, such as the processing circuitry 22, the processor 24, the communications interface 28 or the like, for disabling flexible TDD UL/DL configuration in an instance in which the first and second TDD UL/DL configurations are identical.
  • the apparatus 20 embodied by the access point 12 may also include means, such as the processing circuitry 22, the processor 24, the communications interface 28 or the like, for causing the one or more second TDD UL/DL configurations that have been identified to be signaled to another access point. Additionally or alternatively, the apparatus embodied by the access point may include means, such as the processing circuitry, the processor, the communications interface or the like, for receiving information from a mobile terminal 10 regarding one or more TDD UL/DL configuration candidates of a neighboring access point. In this regard, the apparatus embodied by the access point, such as the processor and/or communications interface, may request information regarding the TDD UL/DL configuration candidates of a neighboring access point from the mobile terminal in order to initiate the provision of such information from the mobile terminal.
  • the apparatus 20 embodied by the mobile terminal may include means, such as the processing circuitry 22, the processor 24 or the like, for determining a first TDD UL/DL configuration based upon system information. See block 50. As described above, various types of system information may identify the first TDD UL/DL configuration including, for example, SIB 1.
  • the apparatus 20 embodied by the mobile terminal 10 may also include means, such as the processing circuitry 22, the processor 24, the communications interface 28 or the like, for receiving an indication of one or more second TDDUL/DL configurations from among one or more TDDUL/DL configuration candidates associated with the first TDDUL/DL configuration that is based upon system information.
  • the apparatus such as the processor and/or the communications interface, may receive the indication of the one or more second TDDUL/DL
  • the indication of one or more second TDDUL/DL configurations may be received, for example, via higher layer signaling, such as RRC, MIB or SIB signaling.
  • the apparatus of this embodiment also includes means, such as the processing circuitry, the processor or the like, for identifying one of the second TDD UL/DL configurations to be utilized, such as based upon DL control channel detection, and means, such as the processing circuitry, the processor or the like, for thereafter operating in accordance with the second TDDUL/DL configuration that has been identified. See blocks 54 and 56.
  • the apparatus 20 embodied by the mobile terminal 10 may also include means, such as a processing circuitry 22, the processor 24 or the like, for determining that the flexible TDDUL/DL configuration is disabled.
  • the apparatus embodied by the mobile terminal may also include means, such as the processing circuitry, the processor, the communications interface 28 or the like, for causing information to be provided regarding one or more TDD UL/DL configuration candidates of a neighboring access point. See block 58 of Figure 6.
  • the apparatus such as the processor and/or the communication interface, may provide the information regarding one or more TDD UL/DL configuration candidates of a neighboring access point in response to a request from the access point 12 that is currently supporting the mobile terminal.
  • the apparatus 20 embodied by the mobile terminal 10 may also include means, such as the processing circuitry 22, the processer 24 or the like, for determining at least one of a UL or a DL HARQ timeline and, in one embodiment, both a UL and a DL HARQ timeline, based upon one or more second TDD UL/DL configurations. See block 59 of Figure 6.
  • the apparatus embodied by the mobile terminal such as the processor, may be configured to implicitly derive a reference TDDUL/DL configuration for the UL and/or DL HARQ timeline from the signaling provided by the access point 12 based upon one or more predefined rules.
  • the apparatus embodied by the mobile terminal may include means, such as the processing circuitry, the processor or the like, for determining a reference TDD UL/DL configuration for the UL HARQ timeline that contains the common DL subframe(s) shared by the one or more second TDD UL/DL configurations.
  • the apparatus such as the processor, may determine the subframes that are designated to be DL subframes by each of the second TDD UL/DL configurations and may then adapt the UL HARQ timeline to the UL HARQ timeline of the determined reference TDD UL/DL configuration.
  • the apparatus embodied by the mobile terminal may also include means, such as the processing circuitry, the processor or the like, for determining a reference TDD UL/DL configuration for the DL HARQ timeline that contains the common UL subframe(s) shared by the one or more second TDD UL/DL configurations.
  • the apparatus such as the processor, may determine the subframes that are designated to be UL subframes by each of the second TDD UL/DL configurations and may then adapt the DL HARQ timeline to the DL HARQ timeline of the determined reference TDD UL/DL configuration.
  • the UL and/or the DL HARQ timelines may also be required to be one of the predefined TDD UL/DL configurations, such as those specified by TS36.211.
  • the apparatus 20 embodied by the mobile terminal 10 may then operate in accordance with the UL and/or DL HARQ timeline that has been determined until the apparatus embodied by the mobile terminal receives a different indication of one or more second TDD UL/DL configurations or until the access point 12 otherwise indicates that the UL and/or DL HARQ timeline that has been determined has expired, such as by the establishment of an effective time period for the UL and/or DL HARQ timeline.
  • the access point 12 may provide an indication that the second TDD UL/DL configurations are TDD UL/DL configurations A, B and C such that the TDD UL/DL configuration will only be reconfigured to be one of TDD UL/DL configurations A, B and C during the next period.
  • the apparatus 20 embodied by the mobile terminal 10 may determine a reference TDD UL/DL configuration to serve as the HARQ timeline.
  • the apparatus may determine reference TDD UL/DL configuration X to support UL HARQ operation with TDD UL/DL configuration X containing the common DL subframes of TDD UL/DL configurations A, B and C.
  • the apparatus may determine reference TDD UL/DL configuration Y to support DL HARQ operation with TDD UL/DL configuration Y containing the common UL subframes of TDD UL/DL configurations A, B and C.
  • the method, apparatus and computer program product of this example embodiment can establish a HARQ timeline that is consistent with the TDDUL/DL configuration of the mobile terminal so as to avoid loss or other inefficiencies associated with the establishment of the HARQ timeline as the TDDUL/DL configurations may change.
  • the method, apparatus and computer program product of an example embodiment may avoid unnecessarily adding to the signaling overhead and the creation of additional error case handling.
  • the reference configuration for the HARQ timeline may be explicitly signaled by the access point 12 to the mobile terminal 10.
  • the apparatus 20 embodied by the access point may include mean, such as the processing circuitry 22, the processor 24, the communications interface 28 or the like, for causing a reference configuration for at least one of a UL HARQ timeline or a DL HARQ timeline to be signaled.
  • the reference configuration may be signaled in various manners including higher layer signaling, such as RRC signaling.
  • the apparatus embodied by the access point may also include means, such as the processing circuitry, the processor, the communications interface or the like, for causing an effective period for the reference configuration to be signaled. See block 62. In this regard, the effective period defines the length of time that the reference configuration will be effective.
  • the apparatus 20 embodied by the access point 12 may include means, such as the processing circuitry 22, the processor 24, the communications interface 28 or the like, for causing another reference configuration for at least one of the UL HARQ timeline or the DL HARQ timeline to be signaled during the effective period. See block 64 of Figure 7.
  • the signaling of another reference configuration during the effective period of a prior reference configuration causes the mobile terminal 10 to alter the respective HARQ timeline.
  • the mobile terminal may switch or fall back from the reference configuration of the UL and/or DL HARQ timeline to the ongoing TDDUL/DL configuration that has otherwise been established between the access point and the mobile terminal.
  • an apparatus 20 embodied by the mobile terminal may communicate with the access point 12 in order to establish the UL and/or DL HARQ timeline based upon explicit signaling from the access point.
  • the apparatus embodied by the mobile terminal may include means, such as the processing circuitry 22, the processor 24, the communications interface 28 or the like, for receiving an indication of a reference configuration for at least one of a UL HARQ timeline or a DL HARQ timeline. See block 70 of Figure 8.
  • the apparatus embodied by the mobile terminal may include means, such as the processing circuitry, the processor, the communications interface or the like, for receiving an indication of an effective period for the reference configuration. See block 72.
  • the apparatus embodied by the mobile terminal, such as the processor and/or the communications interface may receive the indication of the reference configuration and/or the indication of the effective period via a variety of different types of signaling including higher layer signaling, such as RRC signaling.
  • the apparatus 20 embodied by the mobile terminal 10 may also include means, such as the processing circuitry 22, the processor 24 or the like, for operating in accordance with the reference configuration for at least the UL HARQ timeline and/or DL HARQ timeline during the effective period. See block 74. Since the reference configuration for the UL HARQ timeline and/or the DL HARQ timeline may be established based upon the various TDDUL/DL configurations that may be employed during the effective period, the loss or other inefficiencies associated with changes to the HARQ timeline may be reduced or eliminated.
  • the apparatus embodied by the mobile terminal such as the processor, may be configured to operate in accordance with the reference configuration for at least one of the UL HARQ timeline or the DL HARQ timeline during the effective period regardless of the TDD UL/DL configuration otherwise established between the access point 12 and the mobile terminal.
  • the UL and/or DL HARQ timeline does not change during the effective configuration as the TDDUL/DL configuration changes so as to reduce or eliminate loss or inefficiencies otherwise associated with the change in the HARQ timeline [0067]
  • the reference configuration for the UL HARQ timeline and/or DL HARQ timeline may be changed prior to expiration of the effective period.
  • the apparatus 20 embodied by the mobile terminal 10 may include means, such as the processing circuitry 22, the processor 24, the communications interface 28 or the like, for receiving another reference configuration for at least one of the UL HARQ timelines and/or the DL HARQ timeline during the effective period.
  • the apparatus embodied by the mobile terminal may also include means, such as the processing circuitry, the processor or the like, for thereafter operating in accordance with the other reference configuration for at least one of the UL HARQ timeline and/or the DL HARQ timeline.
  • the apparatus 20 embodied by the mobile terminal 10 may also include means, such as the processing circuitry 22, the processor 24 or the like, for operating in accordance with an ongoing TDD UL/DL configuration established between the access point 12 and the mobile terminal for at least one and, more typically, both of the UL HARQ timeline and the DL HARQ timeline following expiration of the effective period. See block 76 of Figure 8.
  • the initial TDD UL/DL configuration may be established, such as by signaling provided by SIB2, to be TDD UL/DL configuration A.
  • the access point 12 may identify the TDD UL/DL configurations for the next three frames n, n+1 and n+2 to be TDD UL/DL configurations B, C and D, respectively.
  • the access point may provide an indication to the mobile terminal 10 that the DL HARQ timeline and the UL HARQ timeline will be X and Y, respectively.
  • the DL HARQ timeline will remain as X and UL HARQ timeline will remain as Y.
  • the HARQ timeline need not necessarily change as the TDD UL/DL configuration changes so as to reduce operational loss associated with the HARQ timeline.
  • the method, apparatus and computer program product of this example embodiment may provide reconfiguration flexibility with respect to the TDD UL/DL configuration, may avoid unnecessary control signaling overhead, may limit HARQ delay and may reduce feedback bundling loss.
  • Figures 3 and 6-8 are flowcharts illustrating the operations performed by a method, apparatus and computer program product, such as apparatus 20 of Figure 2, from the perspective of the mobile terminal 10 in conjunction with Figures 6 and 8 and a network entity, such as the access point 12, respectively, in conjunction with Figures 3 and 7 in accordance with one embodiment of the present invention.
  • a method, apparatus and computer program product such as apparatus 20 of Figure 2
  • a network entity such as the access point 12
  • Figures 3 and 7 in accordance with one embodiment of the present invention.
  • each block of the flowcharts, and combinations of blocks in the flowcharts may be implemented by various means, such as hardware, firmware, processor, circuitry and/or other device associated with execution of software including one or more computer program instructions.
  • one or more of the procedures described above may be embodied by computer program instructions.
  • the computer program instructions which embody the procedures described above may be stored by a memory 26 of an apparatus employing an embodiment of the present invention and executed by a processor 24 of the apparatus.
  • any such computer program instructions may be loaded onto a computer or other
  • programmable apparatus e.g., hardware
  • These computer program instructions may also be stored in a non-transitory computer-readable storage memory that may direct a computer or other programmable apparatus to function in a particular manner, such that the instructions stored in the computer-readable storage memory produce an article of manufacture, the execution of which implements the function specified in the flowchart blocks.
  • the computer program instructions may also be loaded onto a computer or other programmable apparatus to cause a series of operations to be performed on the computer or other programmable apparatus to produce a computer- implemented process such that the instructions which execute on the computer or other programmable apparatus provide operations for implementing the functions specified in the flowchart blocks.
  • the operations of Figures 3 and 6-8 when executed, convert a computer or processing circuitry into a particular machine configured to perform an example embodiment of the present invention.
  • the operations of Figures 3 and 6-8 define an algorithm for configuring a computer or processing circuitry 22, e.g., processor, to perform an example embodiment.
  • a general purpose computer may be provided with an instance of the processor which performs the algorithm of Figures 3 and 6-8 to transform the general purpose computer into a particular machine configured to perform an example embodiment.
  • blocks of the flowcharts support combinations of means for performing the specified functions and combinations of operations for performing the specified functions. It will also be understood that one or more blocks of the flowcharts, and combinations of blocks in the flowcharts, can be implemented by special purpose hardware-based computer systems which perform the specified functions, or

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur un procédé, un appareil et un produit programme d'ordinateur pour prendre en charge une reconfiguration liaison montante/liaison descendante (UL/DL) à duplexage par répartition temporelle (TDD), par exemple pour s'adapter à du trafic dans une cellule respective. Le procédé, l'appareil et le produit programme d'ordinateur peuvent identifier la configuration UL/DL TDD à utiliser par une cellule d'une manière qui réduit le surdébit de signalisation et le traitement en cas d'erreur, par exemple par signalisation PHY implicite. Le procédé, l'appareil et le programme d'ordinateur peuvent identifier une configuration de référence pour la chronologie HARQ, par signalisation soit explicite soit implicite, de manière à réduire la perte en raison d'un changement de chronologie HARQ conjointement avec une reconfiguration UL/DL TDD.
PCT/CN2013/070704 2013-01-18 2013-01-18 Procédé et appareil pour prendre en charge une reconfiguration liaison montante/liaison descendante à duplexage par répartition temporelle Ceased WO2014110801A1 (fr)

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WO2016192019A1 (fr) * 2015-06-01 2016-12-08 华为技术有限公司 Procédé et appareil de planification de ressources
WO2019152864A1 (fr) * 2018-02-02 2019-08-08 Qualcomm Incorporated Relation de synchronisation indiquée par un équipement utilisateur pour une transmission de liaison ascendante

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