WO2014110759A1 - Utilisation flexible de sous-trame spéciale pour liaison descendante-liaison montante à duplexage par répartition temporelle en technologie d'évolution à long terme - Google Patents

Utilisation flexible de sous-trame spéciale pour liaison descendante-liaison montante à duplexage par répartition temporelle en technologie d'évolution à long terme Download PDF

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Publication number
WO2014110759A1
WO2014110759A1 PCT/CN2013/070605 CN2013070605W WO2014110759A1 WO 2014110759 A1 WO2014110759 A1 WO 2014110759A1 CN 2013070605 W CN2013070605 W CN 2013070605W WO 2014110759 A1 WO2014110759 A1 WO 2014110759A1
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WIPO (PCT)
Prior art keywords
grant
causing
instructions
resources
downlink
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PCT/CN2013/070605
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English (en)
Inventor
Tao Chen
Chunyan Gao
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Broadcom Corporation
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Priority to PCT/CN2013/070605 priority Critical patent/WO2014110759A1/fr
Publication of WO2014110759A1 publication Critical patent/WO2014110759A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • LTE Long Term Evolution
  • TDD time division duplex
  • DL-UL downlink-uplink
  • UE user equipment
  • LTE TDD offers flexible deployments without requiring a pair of spectrum resources.
  • LTE TDD allows for asymmetric UL-DL allocations by providing seven different semi-statically configured uplink-downlink configurations. These allocations can provide between 40% and 90% DL subframes.
  • the current mechanism for adapting UL-DL allocation is based on the system information change procedure.
  • the semi-static allocation may not match the instantaneous traffic situation.
  • the existing LTE TDD system can support a slow UL-DL switching indicated by system information block 1 (SIBl) message.
  • SIBl system information block 1
  • the flexible UL-DL switching feature has been identified to provide more system gain, which is required to be backward compatible with the legacy user equipment (UE).
  • the legacy UEs can identify the UL-DL configuration based on the frame configuration information carried in SIBl message.
  • the legacy UEs are not able to decode the new signaling that supports flexible UL-DL switching.
  • the frame reconfiguration carried by the new signaling format is unknown to the legacy UEs. If the DL subframe in a frame configured via SIB 1 message is reconfigured as the UL subframe by the new signaling, the legacy UEs would be unaware of it and would likely perform radio resource management (RRM) measurement (e.g., reference signal received power (RSRP) and reference signal received quality (RSRQ)) and channel state information (CSI) measurement as before, supposing it to be still a DL subframe. This could lead to system crash due to some exceptional behaviors on RRM and packet scheduling.
  • RRM radio resource management
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • CSI channel state information
  • subframe #6 can be used for flexible switching in addition to subframes #3,#4,#7,#8 and #9.
  • the structure of the special subframe consists of three fields: Downlink Pilot Time Slot 11 (DwPTS), Guard Period 13 (GP) and Uplink Pilot Time Slot 15 (UpPTS), as presented in FIG. 1.
  • DwPTS 11 are always reserved for downlink transmission.
  • UpPTS 15 and the subframe immediately following the special subframe are always reserved for uplink transmission.
  • GP 13 denotes the switching time between downlink and uplink.
  • SSF special subframe
  • Table 2 DwPTS/GP/UpPTS length (OFDM symbols)
  • a SSF indicated by SIB1 would be reconfigured to a normal DL subframe (SF).
  • a scheduling problem for resource utilization may arise for both legacy UEs and the next generation UEs.
  • the legacy UEs may still take that subframe as a SSF whereas the next generation UE would identify it as a normal DL SF.
  • the legacy UE can only receive DL transmission carried in the DwPTS field even though it is a normal DL SF.
  • the remaining GP and UpPTS fields in this reconfigured DL subframe cannot be used by any UE according to the present specification, which would waste scarce resources.
  • a legacy UE can only receive the data transmission carried on the DwPTS supposing it is a SSF.
  • the corresponding frequency resources in the remaining GP and UpPTS fields are difficult to utilize based on the present specification.
  • a method comprising configuring a downlink subframe by selecting a downlink control information (DCI) format from one of: at least a first set of DCI bits to schedule a downlink transmission and a second set of DCI bits to schedule a downlink transmission; and configuring a downlink transmission by causing a downlink scheduling grant to be sent in the selected downlink control information (DCI) format.
  • DCI downlink control information
  • a first value indicates that physical downlink shared channel (PDSCH) transmission starts after N symbols for control channels and ends in the last symbol of the subframe.
  • a second value indicates that PDSCH transmission starts from the guard period (GP) field and ends in the last symbol of the subframe.
  • a first value indicates that PDSCH transmission starts after the physical control format information channel (PCIFCH) control symbols and ends in the last symbol of the subframe.
  • a second value indicates that PDSCH transmission starts from the GP field and ends in the last symbol of the subframe.
  • a third value indicates that PDSCH transmission starts after N symbols for control channels and ends in the last symbol of the subframe.
  • a fourth value is reserved.
  • a method comprising activating new downlink grants by flexible switching, said flexible switching comprising causing a dual grant of downlink resources to be sent wherein the dual grant comprises a legacy grant and a new format grant.
  • the method may further comprise receiving an acknowledge/negative acknowledge (ACK/NACK) signal corresponding to the new format grant, after which the method comprises using only the new format grant for scheduling the flexible switching capable UE until a next change of frame structure.
  • the method may further comprise receiving an ACK/NACK signal corresponding to the legacy grant, after which the method comprises using only the legacy grant for scheduling until a next change of frame structure.
  • a method for activating new downlink grants by flexible switching comprises signaling a frequency shift value Af for ACK/NACK resources, indicating Af semi- statically in a broadcast system information block message, or indicating Af in a radio resource control (RRC) message.
  • the method further comprises using legacy grants to schedule DL resources, receiving an ACK/NACK signal with resources corresponding to a frequency shift on the legacy ACK/NACK resources, and using new format grant resources for scheduling until a change of frame structure.
  • Another method comprises activating new downlink resource grants by flexible switching, said flexible switching comprising causing a frequency shift Af for deriving ACK/NACK resources to be received on one of broadcast SIB message or RRC message.
  • One of a legacy or new format resource grant is received to be the newly introduced resource.
  • Readiness for new frame configuration is confirmed by causing an ACK/NACK signal to be sent using resources associated with the current resources with a Af frequency shift.
  • the method calls for using the newly introduced resources, either legacy or new format, until the next change of frame structure.
  • An apparatus comprising at least a processor having or in
  • a downlink control information (DO) format from one of: at least a first set of DCI bits to schedule a downlink transmission and a second set of DCI bits to schedule a downlink transmission; and configuring a downlink transmission by causing a downlink scheduling grant to be sent in the selected downlink control information (DCI) format.
  • DCI downlink control information
  • a first value indicates that physical downlink shared channel (PDSCH) transmission starts after N symbols for control channels and ends in the last symbol of the subframe.
  • a second value indicates that PDSCH transmission starts from the guard period (GP) field and ends in the last symbol of the subframe.
  • a first value indicates that PDSCH transmission starts after N symbols for control channels and ends in the last symbol of the subframe.
  • a second value indicates that PDSCH transmission starts from the GP field and ends in the last symbol of the subframe.
  • a third value indicates that PDSCH transmission starts after N symbols for control channels and ends in the last symbol of the sub frame.
  • a fourth value is reserved.
  • an apparatus comprising at least a processor having or in communication with a memory having stored computer readable instructions, said instructions when executed by said processor causing the apparatus to perform: activating new downlink grants by flexible switching, said flexible switching comprising, causing a dual grant of downlink resources to be sent wherein the dual grant comprises a legacy grant and a new format grant.
  • the apparatus may further comprise instructions causing the apparatus to perform receiving an acknowledge/negative acknowledge (ACK/NACK) signal corresponding to the new format grant and using only the new format grant for scheduling the flexible switching capable UE until a next change of frame structure.
  • the apparatus further comprises instructions causing the apparatus to perform receiving an ACK/NACK signal corresponding to the legacy grant and using only the legacy grant for scheduling until a next change of frame structure.
  • an apparatus comprising: at least a processor having or in communication with a memory having stored computer readable instructions, said instructions when executed by said processor causing the apparatus to perform: activating new downlink grants by flexible switching, said flexible switching comprising, signaling a frequency shift value Af for ACK/NACK resources.
  • the apparatus further comprises instructions causing the apparatus to perform indicating Af semi-statically in a broadcast system information block message, or indicating Af in a radio resource control (RRC) message.
  • the apparatus may perform using legacy grants to schedule DL resources, receiving an ACK/NACK signal with resources corresponding to a frequency shift on the legacy ACK/NACK resources, and using new format grant resources for scheduling until a change of frame structure.
  • a further embodiment is an apparatus comprising at least a processor having or in communication with a memory having stored computer readable instructions, said instructions when executed by said processor causing the apparatus to perform: activating new downlink resource grants by flexible switching, said flexible switching comprising causing a frequency shift Af for deriving ACK/NACK resources to be received on one of broadcast SIB message or RRC message, and causing one of a legacy or new format resource grant to be received to become the newly introduced resource.
  • the apparatus may further comprise instructions causing the apparatus to perform confirming readiness for new frame configuration by causing an ACK/NACK signal to be sent using resources associated with the current resources with a Af frequency shift. Further instructions call for using the newly introduced resources, either legacy or new format, until the next change of frame structure.
  • a computer program product comprising a non- transitory computer readable medium having stored therein computer coded instructions which, when executed by a processor, cause an apparatus to perform selecting a downlink control information (DO) format from one of: at least a first set of DCI bits to schedule a downlink transmission and a second set of DCI bits to schedule a downlink transmission; and configuring a downlink transmission by causing a downlink scheduling grant to be sent in the selected downlink control information (DO) format.
  • DO downlink control information
  • the computer program product further comprises instructions wherein in said first set of DCI grant bits a first value indicates that physical downlink shared channel (PDSCH) transmission starts after N symbols for control channels and ends in the last symbol of the subframe, and wherein in said first set of DCI grant bits a second value indicates that PDSCH transmission starts from the guard period (GP) field and ends in the last symbol of the subframe.
  • a first value indicates that physical downlink shared channel (PDSCH) transmission starts after N symbols for control channels and ends in the last symbol of the subframe
  • GP guard period
  • the computer program product may further comprise instructions wherein in said second set of DCI grant bits a first value indicates that PDSCH transmission starts after N symbols for control channels and ends in the last symbol of the subframe, a second value indicates that PDSCH transmission starts from the GP field and ends in the last symbol of the subframe, a third value indicates that PDSCH transmission starts after N symbols for control channels and ends in the last symbol of the subframe, and a fourth value is reserved.
  • a non-transitory computer readable medium has stored therein computer coded instructions which, when executed by a processor, cause an apparatus to perform: activating new downlink grants by flexible switching, said flexible switching comprising, causing a dual grant of downlink resources to be sent wherein the dual grant comprises a legacy grant and a new format grant.
  • the computer program product further comprises instructions causing the apparatus to perform receiving an acknowledge/negative acknowledge (ACK/NACK) signal corresponding to the new format grant and using only the new format grant for scheduling the flexible switching capable UE until a next change of frame structure.
  • the computer program product further comprises instructions causing the apparatus to alternatively perform receiving an ACK/NACK signal corresponding to the legacy grant and using only the legacy grant for scheduling until a next change of frame structure.
  • a computer program product comprising a non- transitory computer readable medium having stored therein computer coded instructions which, when executed by a processor, cause an apparatus to perform activating new downlink grants by flexible switching, said flexible switching comprising, signaling a frequency shift value Af for ACK/NACK resources, indicating Af semi-statically in a broadcast system information block message, or indicating Af in a radio resource control (RRC) message.
  • the computer program product further comprises instructions causing the apparatus to perform using legacy grants to schedule DL resources, or alternatively receiving an ACK/NACK signal with resources corresponding to a frequency shift on the legacy ACK/NACK resources, and using new format grant resources for scheduling until a change of frame structure.
  • Another computer program product embodiment comprises a non-transitory computer readable medium having stored therein computer coded instructions which, when executed by a processor, cause an apparatus to perform activating new downlink resource grants by flexible switching, said flexible switching comprising causing a frequency shift Af for deriving ACK/NACK resources to be received on one of broadcast SIB message or RRC message, and causing one of a legacy or new format resource grant to be received to become the newly introduced resource.
  • the computer program product may further comprise instructions causing the apparatus to perform confirming readiness for new frame configuration by causing an ACK/NACK signal to be sent using resources associated with the current resources with a Af frequency shift. Further instructions call for using the newly introduced resources, either legacy or new format, until the next change of frame structure.
  • Another different embodiment may be an apparatus comprising: means for selecting a downlink control information (DCI) format from one of: at least a first set of DCI bits to schedule a downlink transmission and a second set of DCI bits to schedule a downlink transmission; and means for configuring a downlink transmission by causing a downlink scheduling grant to be sent in the selected downlink control information (DO) format.
  • DCI downlink control information
  • a first value indicates that physical downlink shared channel (PDSCH) transmission starts after N symbols for control channels and ends in the last symbol of the subframe
  • a second value indicates that PDSCH transmission starts from the guard period (GP) field and ends in the last symbol of the subframe.
  • a first value indicates that PDSCH transmission starts after N symbols for control channels and ends in the last symbol of the subframe
  • a second value indicates that PDSCH transmission starts from the GP field and ends in the last symbol of the subframe
  • a third value indicates that PDSCH transmission starts after N symbols for control channels and ends in the last symbol of the subframe
  • a fourth value is reserved.
  • an apparatus comprising: means for activating new downlink grants by flexible switching, said flexible switching comprising, means for causing a dual grant of downlink resources to be sent wherein the dual grant comprises a legacy grant and a new format grant.
  • the apparatus may further comprise means for receiving an acknowledge/negative acknowledge (ACK/NACK) signal corresponding to the new format grant and means for using only the new format grant for scheduling the flexible switching capable UE until a next change of frame structure.
  • the apparatus may alternatively comprise means for receiving an ACK/NACK signal corresponding to the legacy grant, and means for using only the legacy grant for scheduling until a next change of frame structure.
  • Another apparatus comprises: means for activating new downlink grants by flexible switching, said flexible switching comprising, means for signaling a frequency shift value Af for ACK/NACK resources.
  • This apparatus may comprise means for indicating ⁇ semi-statically in a broadcast system information block message, or means for indicating Af in a radio resource control (RRC) message. It may further comprise means for using legacy grants to schedule DL resources, means for receiving an ACK/NACK signal with resources corresponding to a frequency shift on the legacy ACK/NACK resources, and means for using new format grant resources for scheduling until a change of frame structure.
  • RRC radio resource control
  • Another embodiment is an apparatus comprising: means for activating new downlink resource grants by flexible switching, said flexible switching comprising causing a frequency shift Af for deriving ACK/NACK resources to be received on one of broadcast SIB message or RRC message.
  • the apparatus comprises means for receiving one of a legacy or new format resource grant to be the newly introduced resource. Readiness for new frame configuration is confirmed by means for causing an ACK/NACK signal to be sent using resources associated with the current resources with a Af frequency shift. Once the ACK/NACK signal is sent, the apparatus further comprises means for using the newly introduced resources, either legacy or new format, until the next change of frame structure.
  • Fig. 1 is a schematic illustration of a special subframe as presently specified for
  • Fig. 2 is a schematic drawing of a generalized wireless communications network.
  • Fig. 3 is a schematic block drawing of an apparatus that may be embodied by a mobile terminal or an access point and may be specifically configured in accordance with an example embodiment of the present invention.
  • Fig. 4 is a schematic drawing of a special subframe as modified in one embodiment.
  • Fig. 5 is a schematic drawing of a new signaling protocol according to a dual grant with acknowledgement/non-acknowledgement embodiment including a modified special subframe.
  • Fig. 6 is a schematic drawing of an alternative embodiment of signaling protocol for a single grant with acknowledge/non-acknowledge signaling with modified subframe.
  • Fig. 7 is a flow chart of a method according to a first embodiment.
  • Fig. 8 is a flow chart of a method according to a second embodiment.
  • Fig. 9 is a flow chart of a method according to a third embodiment.
  • Fig. 10 is a flow chard of a method according to a fourth embodiment.
  • 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.
  • Fig. 2 which includes a mobile terminal 8 that is capable of communication with a network 6 (e.g., a core network) via, for example, an access point 2 (AP).
  • a network 6 e.g., a core network
  • AP access point 2
  • the network may be configured in accordance with Global System for Mobile communications (GSM) / Enhanced Data rates for Global Evolution (EDGE) Radio Access Network (GERAN), the network may employ other mobile access mechanisms such as a Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UTRAN), Long Term Evolution (LTE), LTE-Advanced (LTE-A), wideband code division multiple access (W-CDMA), CDMA2000, and/or the like.
  • UMTS Universal Mobile Telecommunications System
  • UTRAN Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • W-CDMA wideband code division multiple access
  • CDMA2000 Code Division Multiple Access
  • the embodiments of the present invention may also be implemented in future LTE based technologies, such as LTE-A and subsequently developed mobile networks.
  • the network 6 may include a collection of various different nodes, devices or functions that may be in communication with each other via corresponding wired and/or wireless interfaces.
  • the network may include one or more base stations, such as one or more Base Transceiver Stations (BTSs) and Base Station Controllers (BSCs), node Bs, evolved node Bs (eNBs), access points (AP), relay nodes or the like (all of which being hereinafter generically referenced as an access point (AP)), each of which may serve a coverage area divided into one or more cells.
  • BTSs Base Transceiver Stations
  • BSCs Base Station Controllers
  • node Bs evolved node Bs
  • AP access points
  • the network may include one or more cells, including, for example, the AP 2, each of which may serve a respective coverage area.
  • the serving cell could be, for example, part of one or more cellular or mobile networks or public land mobile networks (PLMNs).
  • PLMNs public land mobile networks
  • other devices such as processing devices (e.g., personal computers, server computers or the like) may be coupled to the mobile terminal and/or the second communication device via the network.
  • the mobile terminals 8 may be in communication with each other or other devices via the network 6.
  • each of the mobile terminals may include an antenna or antennas for transmitting signals to and for receiving signals from a base station.
  • the mobile terminal 8, also known as a client device may be a mobile communication device or user equipment (UE) such as, for example, a mobile telephone, portable digital assistant (PDA), pager, laptop computer, tablet computer, or any of numerous other hand held or portable communication devices, computation devices, content generation devices, content consumption devices, universal serial bus (USB) dongles, data cards or combinations thereof.
  • UE mobile communication device or user equipment
  • the mobile terminal 8 may include one or more processors that may define processing circuitry either alone or in combination with one or more memories.
  • the processing circuitry may utilize instructions stored in the memory to cause the mobile terminal to operate in a particular way or execute specific functionality when the instructions are executed by the one or more processors.
  • the mobile terminal 8 may also include communication circuitry and corresponding hardware/software to enable communication with other devices and/or the network 6.
  • an apparatus 20 that may be embodied by or otherwise associated with a mobile terminal 8 (a cellular phone, a personal digital assistant (PDA), smartphone, tablet computer or the like) or an AP 2 may include or otherwise be in communication with a processor 22, a memory device 24, a communication interface 28, and a user interface 30.
  • a mobile terminal 8 a cellular phone, a personal digital assistant (PDA), smartphone, tablet computer or the like
  • PDA personal digital assistant
  • AP 2 may include or otherwise be in communication with a processor 22, a memory device 24, a communication interface 28, and a user interface 30.
  • the processor 22 (and/or co-processors or any other processing circuitry assisting or otherwise associated with the processor) may be in communication with the memory device 24 via a bus for passing information among components of the apparatus 20.
  • the memory device 24 may include, for example, one or more non-transitory volatile and/or non-volatile memories.
  • the memory device 24 may be an electronic storage device (e.g., a computer readable storage medium) comprising gates configured to store data (e.g., bits) that may be retrievable by a machine (e.g., a computing device like the processor).
  • the memory device 24 may be configured to store information, data, content, applications, instructions, or the like for enabling the apparatus to carry out various functions in accordance with an example embodiment of the present invention.
  • the memory device could be configured to buffer input data for processing by the processor.
  • the memory device 24 could be configured to store instructions for execution by the processor 22.
  • the apparatus 20 may, in some embodiments, be embodied by a mobile terminal 8 or an AP 2.
  • the apparatus may be embodied as a chip or chip set.
  • the apparatus 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 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 processor 22 may be embodied in a number of different ways.
  • the processor may be embodied as one or more of various hardware processing means such as a coprocessor, a microprocessor, a controller, a digital signal processor (DSP), a processing element with or without an accompanying DSP, or various other processing circuitry including integrated circuits such as, for example, an ASIC (application specific integrated circuit), an FPGA (field programmable gate array), a microcontroller unit (MCU), a hardware accelerator, a special-purpose computer chip, or the like.
  • the processor may include one or more processing cores configured to perform independently.
  • a multi-core processor may enable multiprocessing within a single physical package.
  • the processor may include one or more processors configured in tandem via the bus to enable independent execution of instructions, pipelining and/or multithreading.
  • the processor may be embodied by the processor of the mobile terminal.
  • the processor 22 may be configured to execute instructions stored in the memory device 24 or otherwise accessible to the processor.
  • the processor may be configured to execute hard coded functionality.
  • the processor may represent an entity (e.g., physically embodied in circuitry) capable of performing operations according to an embodiment 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 algorithms and/or operations described herein when the instructions are executed.
  • the processor may be a processor of a specific device (e.g., a mobile terminal 8) configured to employ an embodiment of the present invention by further configuration of the processor by instructions for performing the algorithms and/or operations described herein.
  • the processor may include, among other things, a clock, an arithmetic logic unit (ALU) and logic gates configured to support operation of the processor.
  • ALU arithmetic logic unit
  • the communication interface 28 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 and/or any other device or module in communication with the apparatus 20.
  • 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. Additionally or alternatively, the communication interface may include the circuitry for interacting with the antenna(s) to cause transmission of signals via the antenna(s) or to handle receipt of signals received via the antenna(s).
  • the communications interface of one embodiment may include a plurality of cellular radios, such as a plurality of radio front ends and a plurality of base band chains.
  • the communication interface may alternatively or also support wired communication.
  • the communication interface may include a communication modem and/or other hardware/software for supporting communication via cable, digital subscriber line (DSL), universal serial bus (USB) or other mechanisms.
  • the apparatus may include a user interface 30 that may, in turn, be in communication with the processor 22 to receive an indication of a user input and/or to cause provision of 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(s), touch areas, soft keys, a microphone, a speaker, or other input/output mechanisms.
  • the processor may comprise user interface circuitry configured to control at least some functions of one or more user interface elements such as, for example, a speaker, ringer, microphone, display, and/or the like.
  • the processor and/or user interface circuitry comprising the processor may be configured to control one or more functions of one or more user interface elements through computer program instructions (e.g., software and/or firmware) stored on a memory accessible to the processor (e.g., memory device and/or the like).
  • computer program instructions e.g., software and/or firmware
  • a memory accessible to the processor e.g., memory device and/or the like.
  • the next generation UE can use the remaining guard period (GP) and uplink pilot time slot (UpPTS) fields to receive a DL data transmission in the case of switching from a special subframe (SSF) to a normal DL SF.
  • the following mechanisms to activate/deactivate the usage of new DL grants are designed to solve an ambiguity issue during the UL-DL switching period while retaining the minimum blind decoding complexity and signaling overhead.
  • new DL grant signaling with one or more bits would be used for the next generation UE.
  • First and second sets of bits, perhaps numbering one or more bits in each, may be added to the existing DL scheduling signaling to indicate the starting point and duration of a PDSCH transmission in the subframe in the time domain of the DL subframe (indicated as SSF by SIBl) for the next generation UE.
  • the next generation UE is aware of the frame structure configuration from SIBl and the latest frame reconfigured by the new UL-DL switching signaling.
  • Example sets of DL grant bits are provided below but the possibilities are not limited to these examples.
  • Option 1 one more bit for DL Grant supposing the same power applied over the whole subframe.
  • PDSCH transmission is started after the first N symbols for control channels, and ended in the last symbol of the subframe, which is same as the normal DL subframe transmission;
  • PDSCH transmission is started from GP field and ended in the last symbol of the subframe, e.g., GP and UpPTS fields.
  • Option 2 two more bits for DL Grant supposing different power applied on the
  • DwPTS field and GP/UpPTS field Two bits could be used to indicate DL grants: (see Table 4)
  • PDSCH transmission is started after the control region indicated by the physical control format information channel (PCFICH), and ended in the last symbol of the subframe, which is same as the normal DL suframe transmission;
  • PCFICH physical control format information channel
  • PDSCH transmission is started from GP field and ended in the last symbol of the subframe (e.g., GP and UpPTS fields);
  • PCFICH and ended in the last symbol of DwPTS field
  • option 2 Some examples for option 2 are illustrated in Figure 4.
  • the legacy UEs and the next generation UEs would monitor the SIBl message to discover the TDD UL-DL configuration.
  • the new switching signaling (L1/L2/L3 signaling) would support adaptive UL-DL switching, which could be periodic or event triggered signaling. It will only be known to the next generation UEs.
  • the new DL grants would indicate the starting point and duration of PDSCH transmission. For example (in Fig.
  • ⁇ UE #1 is only scheduled on DwPTS part indicated by "10".
  • ⁇ UE #2 and UE #3 are only scheduled in GP and UpPTS fields indicated by "01".
  • ⁇ UE #4 is scheduled over the whole subframe period (excluding the control region) as indicated by "1 1".
  • Activation/deactivation of the new DL grants During a UL-DL switching period, there is an ambiguity issue.
  • the base station (BS) reconfigures the frame structure via the UL-DL switching signal but is not sure whether UE is ready.
  • the unreliability of UE reception and uncertainty of UE processing time creates the uncertainty. It results in an issue of when the new DL grants may be used.
  • a dual-grant (the new format grant 502 and the legacy grant 504) would be sent simultaneously from eNB 500 to UE 501 to schedule the same resources for DL transmission.
  • UE detects the first legacy grant 508 it sends an ACK/NACK to eNB using the resources associated with the legacy grant 507.
  • UE detects the new grant 510 it sends an ACK/NACK 505 to eNB using the newly introduced grant 502.
  • eNB can discern whether UE is ready for the new frame configuration (e.g., capability to decode the newly introduced grant or not).
  • Step 1 During the ambiguity period ⁇ ', eNB would use both legacy grants 502 and new format grants 504 to schedule the same DL resources for the next generation UEs. To reduce the blind decoding complexity, the legacy grants can be located in the common search space whereas the new format grants can be in the user-specific search space.
  • Step 2 UE tries to decode both grants 502, 504 once UE is ready for the new configuration.
  • UE finds the newly introduced DL grant e.g., the new format grant 510 in case of SSF->DL_SF switching ambiguity period ⁇ ', and the legacy format grant 522 in the case of DL_SF->SSF switching ambiguity period 'B'
  • Step 3 when eNB receives the ACK/NACK corresponding to the new introduced grant (510 or 522), eNB knows that UE is ready for reconfiguration. After that, eNB would only use the newly introduced grant for scheduling until the change of the frame structure.
  • This option can solve the ambiguity issue. However, it would send the duplicated grants with two formats during the ambiguity period, which may waste the control channels resources. In the case of a small cell scenario (a typical scenario for flexible TDD switching), the cost may be acceptable due to the relatively fewer active users.
  • Option 2 Single-Grant with ACK/NAK resource shifting
  • eNB would indicate a frequency shift ( ⁇ ) for ACK/NACK resources, associated with the flexible switching signaling or transmitted via RRC/broadcast signaling.
  • UE can provide the feedback on the legacy resources if UE is not ready for reconfiguration or on the new ones with a frequency shift ( ⁇ ) if UE is ready.
  • eNB can determine whether UE is ready for the new configuration.
  • ⁇ frequency shift value
  • Af 650 could be indicated semi- statically in the broadcast message (e.g., system information block (SIB)) message or
  • Step 2 During the ambiguity period ⁇ ', eNB would use the legacy grants 602 to schedule the DL resources for the next generation UEs when switching from SSF-
  • Step 3 UE 601 attempts to decode the legacy grants. Once UE 601 is ready for the new configuration, UE would use the corresponding 'new grant' ACK/NACK resources 606 with a frequency shift ( ⁇ ) to provide the feedback. Otherwise, UE would just use the normal ACK/NACK resources 604 for feedback.
  • This option can also solve the ambiguity issue. It would require the double reservation of ACK/NACK resources and an additional signaling parameter to indicate Af. Compared to option 1 , it has the lower signaling cost with no need of duplicated grants.
  • downlink grants may be made according to two potential variants for configuration.
  • the downlink subframe is configured in a selected downlink control information (DCI) format 701.
  • DCI downlink control information
  • a one-bit downlink resource grant 703 may be provided wherein a first value of the one -bit field (either 1 or 0) may indicate 707 that the PDSCH extends (see Table 3) from the last control bits to the last subframe symbol (that is, DwPTS, GP, and UpPTS).
  • the second value (the other of 1 or 0) 711 may indicate that PDSCH extends from the guard period to the last subframe symbol.
  • the DL grant may comprise two bits 705 in the DCI format.
  • a first value 709 may indicate that PDSCH starts after N symbols for the control channel and extends to the last subframe symbol (see Table 3).
  • a second value may indicate 713 that PDSCH extends from the guard period field to the last subframe symbol.
  • a third value may indicate 715 that PDSCH starts after N symbols for the control channel and extends to the last subframe symbol.
  • a fourth value of the two-bit field 717 may be reserved.
  • eNB sends dual resource grants 803, a legacy grant and a new format grant, to next generation UE.
  • eNB uses only the new format resources 809 for flexible switching UE until the next frame structure change.
  • Fig. 9 illustrates an alternative single resource grant method for activating a new downlink grant 901 with flexible switching.
  • eNB signals 903 a frequency shift Af for ACK/NACK resources.
  • the Af indication may be sent semi-statically in a broadcast SIB message 905 or it may be indicated in an RRC message 911.
  • eNB receives an ACK/NACK signal shifted by Af on legacy ACK/NACK resources 915. Once the ACK/NACK is received, eNB uses only new format DL grant resources until the next change of frame structure 917. The process works in reverse for switching back to SSF.
  • the steps listed for each of Figs. 7-9 may be performed in an apparatus comprising means for performing each of the listed functions.
  • Said apparatus may be embodied by a serving cell, or access point 2 (Fig. 2) to the network 6.
  • the access point 2 may take the form of an apparatus 20 comprising a processor 22, a memory 24 and communications interface 28.
  • the means for performing the listed functions includes, for example, (Fig. 3) a processor 22, a memory 24 containing computer coded instructions for carrying out the functions, and a communications interface 28 for sending resource grants to the UE and receiving ACK/NACK signals and other information in return.
  • Fig. 10 illustrates the method for single grant as implemented in UE 1001.
  • a frequency shift Af for deriving ACK/NACK resources is received either in a broadcast SIB message 1003 or in the RRC message 1005.
  • UE receives one of a legacy or new format resource grant 1007 as the newly introduced resource.
  • UE signals its readiness to adopt a new configuration by sending an ACK/NACK 1009 on the current resource with the frequency shift Af.
  • UE accepts the new configuration it uses only the newly introduced resource 101 1 until the next frame structure change.
  • the steps listed for Fig. 10 may be performed in an apparatus comprising means for performing each of the listed functions.
  • Said apparatus may be embodied by a mobile terminal 8 (Fig. 2) in communication with an access point 2 to the network 6.
  • the mobile terminal may comprise (Fig. 3) a processor 22, a memory 24 and communications interface 28.
  • the means for performing the listed functions includes, for example, a processor 22, a memory 24 containing computer coded instructions for carrying out the functions, and a communications interface 28 for receiving resource grants from the access point and sending ACK/NACK signals and other information in return.
  • Figures 7-10 are flowcharts of a method, apparatus and program product according to example embodiments of the invention. It will be understood that 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. For example, one or more of the procedures described above may be embodied by computer program instructions. In this regard, the computer program instructions which embody the procedures described above may be stored by a memory device 24 of an apparatus 20 employing an embodiment of the present invention and executed by a processor 22 in the apparatus.
  • any such computer program instructions may be loaded onto a computer or other programmable apparatus (e.g., hardware) to produce a machine, such that the resulting computer or other programmable apparatus embody a mechanism for implementing the functions specified in the flowchart blocks.
  • These computer program instructions may also be stored in a non-transitory computer-readable storage memory (as opposed to a transmission medium such as a carrier wave or electromagnetic signal) that may direct a computer or other programmable apparatus to function in a particular manner, such that the instructions stored in the computer-readable 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 block(s).
  • the operations of Figures 7-10 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 7-10 define an algorithm for configuring a computer or processing circuitry (e.g., processor) to perform an example embodiment.
  • a general purpose computer may be configured to perform the functions shown in Figures 7-10 (e.g., via configuration of the processor), thereby transforming 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, combinations of operations for performing the specified functions and program instructions 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 operations, or combinations of special purpose hardware and computer instructions.
  • the reconfiguration processes described provide several advantages for the next generation network. They offer full utilization of the resources during switching from SSF to normal DL SL. Ambiguity resolution can be accomplished with low signaling cost. There is low signaling overhead cost and latency overall. These processes cause no increase in attempts of UE blind detection. There would be only a minor impact on network specifications and implementation would be fairly simple. The processes are flexible depending on eNB scheduling. And these processes are fully testable. The following list of abbreviations and acronyms is provided as a reference for terms appearing in this description that may also appear in the claims to follow.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • 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 assurer une commutation flexible entre des octrois de ressource de liaison descendante (DL) patrimonial et de nouveau format dans un réseau de communication sans fil. Le nouveau format peut être signalé par un seul bit ou par deux bits dans l'octroi DL afin d'indiquer la longueur et le format de transmissions de canal partagé de liaison descendante physique (PDSCH). Durant une période de commutation flexible de liaison montante (UL) à DL, une station de base peut signaler les octrois de ressource aussi bien patrimonial que de nouveau format à un équipement utilisateur (UE). Une fois que l'UE a détecté les deux octrois, il peut envoyer un signal d'accusé de réception/accusé de réception négatif (ACK/NACK) afin d'activer le nouvel octroi DL à l'aide de ressources associées à l'octroi nouvellement introduit. Selon une variante, la station de base peut indiquer un décalage de fréquence Δf pour des ressources ACK/NACK permettant à l'UE d'indiquer son aptitude à la nouvelle configuration.
PCT/CN2013/070605 2013-01-17 2013-01-17 Utilisation flexible de sous-trame spéciale pour liaison descendante-liaison montante à duplexage par répartition temporelle en technologie d'évolution à long terme WO2014110759A1 (fr)

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WO2018127241A1 (fr) * 2017-01-06 2018-07-12 电信科学技术研究院 Procédé de transmission de dci, terminal utilisateur et dispositif côté réseau
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CN111064555A (zh) * 2017-01-17 2020-04-24 华为技术有限公司 用于调度下行传输的方法和设备
CN111970103A (zh) * 2014-12-30 2020-11-20 北京三星通信技术研究有限公司 一种下行信道和/或下行参考信号的接收方法和设备
WO2021098059A1 (fr) * 2020-02-14 2021-05-27 Zte Corporation Transmission et configuration d'informations de rétroaction d'informations d'état de canal
EP3907922A1 (fr) * 2016-04-05 2021-11-10 QUALCOMM Incorporated Indication de symboles de départ et d'arrêt de pdsch à travers un pdcch
CN114731669A (zh) * 2020-02-19 2022-07-08 华为技术有限公司 一种通信方法及装置
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EP3171561B1 (fr) * 2014-08-22 2024-03-27 ZTE Corporation Procédé de traitement de signaux, station de base et terminal
CN111970103A (zh) * 2014-12-30 2020-11-20 北京三星通信技术研究有限公司 一种下行信道和/或下行参考信号的接收方法和设备
CN111970103B (zh) * 2014-12-30 2023-07-11 北京三星通信技术研究有限公司 一种下行信道和/或下行参考信号的接收方法和设备
CN106856613B (zh) * 2015-12-09 2020-04-14 华为技术有限公司 一种下行控制信息dci的发送方法及相关装置
CN106856613A (zh) * 2015-12-09 2017-06-16 华为技术有限公司 一种下行控制信息dci的发送方法及相关装置
US11477771B2 (en) 2016-04-05 2022-10-18 Qualcomm Incorporated Indicating start and stop symbols of PDSCH and PUSCH through PDCCH
EP3907922A1 (fr) * 2016-04-05 2021-11-10 QUALCOMM Incorporated Indication de symboles de départ et d'arrêt de pdsch à travers un pdcch
CN109314618B (zh) * 2016-07-04 2021-12-24 苹果公司 下行链路控制信息(dci)配置
CN109314618A (zh) * 2016-07-04 2019-02-05 英特尔Ip公司 下行链路控制信息(dci)配置
WO2018127241A1 (fr) * 2017-01-06 2018-07-12 电信科学技术研究院 Procédé de transmission de dci, terminal utilisateur et dispositif côté réseau
CN111064555B (zh) * 2017-01-17 2021-05-14 华为技术有限公司 用于调度下行传输的方法和设备
US11240835B2 (en) 2017-01-17 2022-02-01 Huawei Technologies Co., Ltd. System and method for co-existence of low-latency and latency-tolerant communication resources
CN111064555A (zh) * 2017-01-17 2020-04-24 华为技术有限公司 用于调度下行传输的方法和设备
WO2021098059A1 (fr) * 2020-02-14 2021-05-27 Zte Corporation Transmission et configuration d'informations de rétroaction d'informations d'état de canal
CN114731669A (zh) * 2020-02-19 2022-07-08 华为技术有限公司 一种通信方法及装置
CN114731669B (zh) * 2020-02-19 2023-06-20 华为技术有限公司 一种通信方法及装置

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