WO2016204714A1 - Structure de trame et procédure de demande de retransmission automatique hybride - Google Patents

Structure de trame et procédure de demande de retransmission automatique hybride Download PDF

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Publication number
WO2016204714A1
WO2016204714A1 PCT/US2015/000449 US2015000449W WO2016204714A1 WO 2016204714 A1 WO2016204714 A1 WO 2016204714A1 US 2015000449 W US2015000449 W US 2015000449W WO 2016204714 A1 WO2016204714 A1 WO 2016204714A1
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WIPO (PCT)
Prior art keywords
downlink
uplink
frame
retransmission
architecture
Prior art date
Application number
PCT/US2015/000449
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English (en)
Inventor
Senjie Zhang
Hong Cheng
Jong-Kae Fwu
Original Assignee
Intel Corporation
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Publication of WO2016204714A1 publication Critical patent/WO2016204714A1/fr

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/1887Scheduling and prioritising arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829Arrangements specially adapted for the receiver end
    • H04L1/1854Scheduling and prioritising arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/24Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643Radio 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]
    • H04B7/2656Radio 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

Definitions

  • the present disclosure relates to mobile wireless communication and to a frame structure and a hybrid automatic retransmission request procedure.
  • Latency is a transit time from one entity to another entity.
  • the latency includes transmission time along a medium, processing time and the like.
  • Errors can occur through data corruption, interference and the like. Errors can sometimes be corrected using a technique, such as a forward error correction code (FEC), where parity bits are sent along with a message or in response to a request. The correction technique may be able to correct the error(s). If not, retransmission of the data is requested, which takes extra time. Additionally, if high latency is present, the retransmission takes even more time further delaying communications.
  • FEC forward error correction code
  • FIG. 1 is a diagram illustrating an architecture using an enhanced frame structure and an enhanced retransmission procedure according to various aspects.
  • FIG. 2 is a diagram illustrating subframe types in accordance with various aspects.
  • Fig. 3A is a table illustrating example system parameters considered for a HARQ or retransmission procedure.
  • Fig. 3B is a table illustrating retransmission parameters based on a set of system parameters.
  • Fig. 4 is table showing a set of example DUUL frame configurations based on system parameters.
  • FIG. 5 is a flow diagram illustrating a method of performing cellular
  • FIG. 6 illustrates, for one embodiment, example components of a User Equipment (UE) device.
  • UE User Equipment
  • a component can be a processor (e.g., a processor
  • microprocessor a controller, or other processing device
  • a process running on a processor a controller, an object, an executable, a program, a storage device, a computer, a tablet PC, an electronic circuit and/or a mobile phone with a processing device.
  • an application running on a server and the server can also be a component.
  • One or more components can reside within a process, and a component can be localized on one computer and/or distributed between two or more computers.
  • a set of elements or a set of other components can be described herein, in which the term "set" can be interpreted as "one or more.”
  • these components can execute from various computer readable storage media having various data structures stored thereon such as with a module, for example.
  • the components can communicate via local and/or remote processes such as in accordance with a signal having one or more data packets (e.g. , data from one component interacting with another component in a local system, distributed system, and/or across a network, such as, the Internet, a local area network, a wide area network, or similar network with other systems via the signal).
  • a signal having one or more data packets (e.g. , data from one component interacting with another component in a local system, distributed system, and/or across a network, such as, the Internet, a local area network, a wide area network, or similar network with other systems via the signal).
  • a component can be an apparatus with specific functionality provided by mechanical parts operated by electric or electronic circuitry, in which the electric or electronic circuitry can be operated by a software application or a firmware application executed by one or more processors.
  • the one or more processors can be internal or external to the apparatus and can execute at least a part of the software or firmware application.
  • a component can be an apparatus that provides specific functionality through electronic components without mechanical parts; the electronic components can include one or more processors therein to execute software and/or firmware that confer(s), at least in part, the
  • circuitry may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group), and/or memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable hardware components that provide the described functionality.
  • ASIC Application Specific Integrated Circuit
  • the circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules.
  • circuitry may include logic, at least partially operable in hardware.
  • Latency is an important characteristic for cellular communications and cellular systems. Generally, latency is a transit time from one entity to another.
  • user latency is defined as a one way transit time between a service data unit (SDU) packet being available at an internet protocol (IP) layer in a user equipment (UE) or enhanced node B (eNodeB) and the availability of this packet at an IP layer in another UE or eNodeB.
  • SDU service data unit
  • IP internet protocol
  • UE user equipment
  • eNodeB enhanced node B
  • the user plane latency is expected to be less than about 1 ms.
  • the frame structure also referred to as a radio frame structure, includes a plurality of subframes. Each subframe typically includes a downlink transmission or uplink transmission and a guard period (GP) to enhance communications.
  • the uplink transmission is in a direction from a UE to eNodeB whereas the downlink transmission is in a direction from eNodeB to UE.
  • the uplink and downlink transmissions generally include data packets, control information, supporting signals, reference signals and the like.
  • the control information includes, for example, acknowledgement (ACK), not acknowledgement, and the like.
  • the number of subframes within the frame structure can vary. In one example, the number of subframes N sf is 8 or 10 and the subframes are indexed as 0, 1 , 2, N sf - 1.
  • the GP is a burst period where transmission is not permitted.
  • the GP is used to protect adjacent bursts from transmission overlap due to, for example, propagation time from the UE to the eNodeB or base station.
  • a GP is typically placed at the end of a subframe to mitigate interference from a subsequent subframe.
  • a GP is helpful when there is a transition or change in direction of transmission.
  • the GP is not needed. The length of the GP unnecessarily adds to the user plane latency and degrades cellular communication.
  • Errors can occur through data corruption, interference and the like. Errors can sometimes be corrected using a technique, such as a forward error correction code (FEC), where parity bits are sent along with a message or in response to a request.
  • FEC forward error correction code
  • One technique involves automatic retransmission request (ARQ), where retransmission of data is automatically requested upon detection of an error.
  • ARQ automatic retransmission request
  • HARQ hybrid automatic retransmission request
  • the present disclosure includes various aspects/embodiments that facilitate cellular communications and enhance latency.
  • the aspects include a frame structure and hybrid automatic retransmission request (HARQ) procedure for 5G time division duplexing (TDD) systems.
  • HARQ hybrid automatic retransmission request
  • the various aspects provide relatively low latency while providing low GP overhead, traffic adaptation, relatively low processing delay and the like.
  • Fig. 1 is a diagram illustrating an architecture 100 using an enhanced frame structure and an enhanced retransmission procedure according to various aspects or embodiments.
  • the architecture 100 mitigates latency and enhances cellular
  • the architecture 100 is incorporated into a network entity, such as a base station, eNodeB, mobile device, user equipment and the like.
  • the architecture 100 includes frame logic 102, retransmission logic 108 and a transmit component 104.
  • the frame logic 102 and the retransmission logic can, for example, be implemented in circuitry and/or logic.
  • the frame logic 102 is configured to generate a frame 110 using time division duplexing (TDD).
  • TDD time division duplexing
  • the frame also referred to as a radio frame, includes a plurality or number of subframes. In one example, a frame includes ten subframes and each subframe includes 14 OFDM/SC-FDMA symbols.
  • the frame logic 102 configures the types of subframes used in the frame 1 10.
  • the configuration of subframes within a radio frame is referred to as a frame
  • the DIJUL configuration is based on
  • the subframes generally include 3 types, a downlink subframe, an uplink subframe and a special subframe.
  • the downlink subframe includes a downlink transmission field and a GP.
  • the downlink field is for downlink transmission or communication from a base station, such as an eNodeB, to a mobile device, such as a UE.
  • the uplink subframe includes an uplink transmission field and a GP.
  • the uplink field is for uplink transmission or communication from a mobile device, such as a UE, to a base station, such as an eNodeB.
  • the special subframe includes a downlink/uplink proportional configuration.
  • the special subframe includes a special downlink transmission field, a first GP, a special uplink transmission field, and a second GP.
  • the lengths of the special downlink field and the special uplink field can be varied and defined by a ratio with respect to each other from 0% to 100%.
  • the special subframe can set the special downlink field to length of 0 and set the special uplink field to a maximum length.
  • the length in one example, is in terms of symbols.
  • the uplink and downlink transmissions generally include data packets, control information, supporting signals, reference signals and the like.
  • the control information includes, for example, acknowledgement (ACK), not acknowledgement, and the like.
  • ACK acknowledgement
  • the number of subframes within the frame structure can vary.
  • the length of the subframes are typically fixed to a set length.
  • the number of subframes within the frame structure can vary. In one example, the number of subframes N sr is 8 or 10 and the subframes are indexed as 0, 1 , 2, N sf - 1.
  • Each subframe is used by one or more UEs.
  • the frame logic 102 is configured to allocate or control lengths of the various fields or portions in the subframes.
  • the frame logic 102 allocates the length of GPs based on succeeding subframes and reduces the length of the GPs where the GPs are not needed or required.
  • the unused lengths are reallocated to downlink and/or uplink fields.
  • a GP of a downlink subframe is set to a length of zero upon a subsequent subframe also being a downlink subframe or a special subframe.
  • the downlink transmission field is allocated additional lengths or symbols.
  • a GP of an uplink subframe is set to a length of zero upon a subsequent subframe also being an uplink subframe.
  • the uplink transmission field length is increased to make use of the extra available portion of the subframe not used by the GP.
  • a first guard period of a special subframe can be set to zero if the special uplink transmission field is set to zero.
  • a second guard period of the special subframe can be set to zero if the subsequent subframe is an uplink subframe.
  • the frame logic 102 is also configured to set the downlink/uplink proportion configuration for the special subframe based on expected need, established
  • the downlink/uplink proportion configuration defines a ratio or percentage of length of the special downlink transmission field to the special uplink transmission field.
  • the retransmission logic 108 is configured to determine retransmission parameters based on system parameters. Then, the retransmission logic 108 initiates a retransmission procedure and sets subframes according to the determined
  • the retransmission procedure in this example, is a HARQ retransmission procedure.
  • the retransmission logic sets the retransmission procedure according to one or more factors, such as the frame DL/UL configuration, subframe length, processing delay and the like.
  • the HARQ or retransmission procedure depends on system parameters including DL/UL configuration, number of subframes, subframe duration, transmitter processing delay, receiver processing delay, frame duration, number of GP, allowed or maximum GP overhead and the like.
  • the retransmission procedure involves detecting an error in a received subframe at a receiving network entity, such as a UE or an eNodeB.
  • the network entity notifies that transmitting network entity and requests retransmission of the errored subframe.
  • the transmitting network entity can be an eNodeB or the UE.
  • the transmitting network entity retransmits a corrected subframe.
  • the corrected subframe is received and the receiving network entity.
  • the number of frames or delay for each portion depends on the system parameters.
  • the eNodeB should re-transmit the corresponding data packet at subframe n + Q d , or later subframes.
  • the eNodeB For uplink transmission from the UE to the eNodeB, upon the detection and CRC checking result of data packet at subframe n - K u , the eNodeB should transmit ACK/NACK at subframe n; upon the detection of ACK/NACK and scheduling information at subframe n, the UE can re-transmit the corresponding data packet at subframe n + Q u , or later subframes.
  • the retransmission parameters K dl Q d , K u and Q u vary according to the radio frame configuration, including the subframes.
  • the parameter K d indicates an offset for ACK provided at a current frame by the UE, frame n.
  • the parameter Q d indicates an offset for a retransmission by the eNodeB provided at a current frame n by the eNodeB.
  • the parameter K u indicates an offset for ACK provided at a current frame n by an eNodeB.
  • the parameter Q u indicates an offset for a retransmission by the UE provided at the current frame n.
  • the transmit component 104 is configured to process the frame 1 10 from the frame logic 102 and generate a transmission signal. Additionally, the transmit component is configured to perform the retransmission procedure as determined by the retransmission component 108. One or more antenna 106 provide the transmission signal and also receive signals. The transmission signal is received and utilized by one or more network entities 112.
  • the network entities 1 12 can include, for example, one or more UE, one or more eNodeB, and the like.
  • Fig. 2 is a diagram illustrating subframe types 200 in accordance with various aspects or embodiments.
  • the subframe types are controlled and allocated by frame logic, such as the frame logic 102, to enhance communication and mitigate user plane latency. It is appreciated that variations in the shown subframe types 200 are contemplated.
  • a downlink subframe type 201 is a subframe for downlink transmission, which includes transmissions from an eNodeB to a UE.
  • the downlink subframe type 201 has a fixed length and includes a downlink field and a GP.
  • the length of the downlink field and the GP can vary dynamically as determined by the frame logic. When one is decreased, the other field is increased.
  • An uplink subframe type 202 is a subframe used for uplink transmission, such as transmissions from a UE to an eNodeB.
  • the uplink subframe type 202 has a fixed length and includes an uplink field and a GP.
  • the length of the uplink field and the GP can vary dynamically as determined by the frame logic. When one field is decreased, the other field is increased.
  • a special subframe type 203 is a special subframe that can be used for both downstream and upstream transmission.
  • the special subframe type 203 includes a special downlink field, a first GP, a special uplink field, and a second GP.
  • the length of the special downlink field, the first GP, the special uplink field and the second GP can vary dynamically as determined by the frame logic.
  • the special downlink field and/or the special uplink field can be adjusted to a length of zero or one symbol.
  • Fig. 3A is a table illustrating example system parameters 300 considered for a HARQ or retransmission procedure. Retransmission parameters, described above, are determined based on the system parameters 300. Then, the HARQ procedure is followed using the determined retransmission parameters.
  • system parameters 300 are provided for illustrative purposes. Various aspects can utilize additional parameters and/or omit some of the shown parameters. Further, the values provided are for illustrative purposes and to aid understanding. It is appreciated that the system parameters 300 can have other values.
  • the system parameters 300 are for one or more frames used in cellular communication.
  • the table depicts the system parameters 300 for a single radio frame.
  • the frame has a duration, in time, of 1 ms.
  • the maximum GP overhead is set to 4 percent.
  • the transmitter has a processing delay of 0.2 ms.
  • the transmitter processing delay corresponds to twice a transmission time interval (TTI), which is twice the subframe duration.
  • the receiver has a processing delay of 0.3 ms.
  • the receiver processing delay is three times the transmission time interval, which is three times the subframe duration.
  • Fig. 3B is a table illustrating retransmission parameters 301 based on a set of system parameters 300.
  • the retransmission parameters 301 are provided for illustrative purposes. It is appreciated that the retransmission parameters 301 can have other suitable values in various aspects.
  • the retransmission parameters 301 of Fig. 3B are based on the system parameters 300 shown in Fig. 3A.
  • the retransmission parameters 301 are shown for an example frame that complies with the system parameters 300.
  • a DUUL configureation index is provided in a first column.
  • a second column provides details and labels for subframe type and the retransmission parameters.
  • the retransmission parameters include K d , Q d , K u and Q u , which identify frame offsets as shown above.
  • An example 302 is provided for illustrative purposes assuming that a current subframe is index 7.
  • the subframe type is an uplink (U) transmission frame.
  • transmission is from a UE to an eNodeB.
  • the UE provides an ACK, as K d , which has a value of 7.
  • the ACK is indicating that an error occurred 7 subframes earlier, on subframe 0.
  • the UE also provides the retransmission offset Q d , here shown as 13.
  • the retransmission offset informs the sender of subframe 0 that subframe 7 should be retransmitted 13 or more subframes from the current subframe.
  • a second example 303 is described where a current subframe is subframe index 1 .
  • the subframe type is a downlink (D) transmission frame.
  • D downlink
  • transmission is from an eNodeB to a UE.
  • the eNodeB provides multiple ACKs, as K u , which has a values of 8, 12 and 9.
  • K u has a values of 8, 12 and 9.
  • the ACKs are indicating that an errors occurred 8, 12 and 9 subframes earlier.
  • the eNodeB also provides the
  • the retransmission offset informs the sender, here the UE, of the error occurring subframes and that the subframes should be retransmitted 1 1 or more subframes from or after the current subframe.
  • the average frame alignment time for downlink and uplink are determined by the radio frame DL/UL configuration.
  • the average HARQ RTT for downlink and uplink are determined by the HARQ procedure (indirectly by the DL/UL configuration).
  • Fig. 3B shows the value of T fad , T fau , T rttd and T rttu in unit of micro seconds (ms).
  • the overall downlink latency can be calculated as:
  • L d TX processing delay + Tf ad + TTI duration + RX processnig delay + T rttd x BIER
  • the overall uplink latency can be calculated as:
  • the downlink latency L d is shown as 0.93 ms and the uplink latency L u is shown as 0.68 ms.
  • Fig. 4 is table showing a set of example DUUL frame configurations based on system parameters.
  • the configurations include the example from Fig. 3B and includes additional configurations from AO to A9.
  • the DL/UL frame configurations are based on the system parameters of Fig. 3A.
  • Each configuration provides retransmission parameters, if any, for each subframe as shown.
  • Fig. 5 is a flow diagram illustrating a method 500 of performing cellular communication including enhanced retransmission and an enhanced frame structure.
  • a downlink/uplink frame configuration is selected from a plurality of frame configurations based on system parameters at block 502.
  • the frame configuration includes sub frame types, including downlink, uplink and special subframes.
  • the plurality of frame configurations can be in accordance with the system parameters. Further, the plurality of frame configurations have varied downlink/uplink ratios and the like.
  • Lengths for various fields and guard periods for a plurality of subframes are configured or allocated at block 504.
  • a guard period for a downlink subframe with a subsequent adjacent downlink subframe can be set to a length of zero.
  • Retransmission parameters are determined based on the system parameters at block 506.
  • the retransmission parameters include downlink ACK offset, downlink retransmission offset, uplink ACK offset, and uplink retransmission offset.
  • a retransmission or HARQ procedure is performed at block 508 according to the retransmission parameters.
  • circuitry may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group), and/or memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable hardware components that provide the described functionality.
  • ASIC Application Specific Integrated Circuit
  • the circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules.
  • circuitry may include logic, at least partially operable in hardware.
  • FIG. 6 illustrates, for one embodiment, example components of a User Equipment (UE) device 600.
  • the UE device 600 e.g., the wireless communication device 101
  • the UE device 600 can include application circuitry 602, baseband circuitry 604, Radio Frequency (RF) circuitry 606, front-end module (FEM) circuitry 608 and one or more antennas 680, coupled together at least as shown.
  • RF Radio Frequency
  • FEM front-end module
  • the application circuitry 602 can include one or more application processors.
  • the application circuitry 602 can include circuitry such as, but not limited to, one or more single-core or multi-core processors.
  • the processor(s) can include any combination of general-purpose processors and dedicated processors (e.g., graphics processors, application processors, etc.).
  • the processors can be coupled with and/or can include memory/storage and can be configured to execute instructions stored in the memory/storage to enable various applications and/or operating systems to run on the system.
  • the baseband circuitry 604 can include circuitry such as, but not limited to, one or more single-core or multi-core processors.
  • the baseband circuitry 604 can include one or more baseband processors and/or control logic to process baseband signals received from a receive signal path of the RF circuitry 606 and to generate baseband signals for a transmit signal path of the RF circuitry 606.
  • Baseband processing circuity 604 can interface with the application circuitry 602 for generation and processing of the baseband signals and for controlling operations of the RF circuitry 606.
  • the baseband circuitry 604 can include a second generation (2G) baseband processor 604a, third generation (3G) baseband processor 604b, fourth generation (4G) baseband processor 604c, and/or other baseband processor(s) 604d for other existing generations, generations in development or to be developed in the future (e.g., fifth generation (5G), 6G, etc.).
  • the baseband circuitry 604 e.g., one or more of baseband processors 604a-d
  • the radio control functions can include, but are not limited to, signal modulation/demodulation, encoding/decoding, radio frequency shifting, etc.
  • modulation/demodulation circuitry of the baseband circuitry 604 can include Fast-Fourier Transform (FFT), precoding, and/or constellation
  • encoding/decoding circuitry of the baseband circuitry 604 can include convolution, tail-biting convolution, turbo, Viterbi, and/or Low Density Parity Check (LDPC) encoder/decoder functionality.
  • LDPC Low Density Parity Check
  • the baseband circuitry 604 can include elements of a protocol stack such as, for example, elements of an evolved universal terrestrial radio access network (EUTRAN) protocol including, for example, physical (PHY), media access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), and/or radio resource control (RRC) elements.
  • EUTRAN evolved universal terrestrial radio access network
  • a central processing unit (CPU) 604e of the baseband circuitry 604 can be configured to run elements of the protocol stack for signaling of the PHY, MAC, RLC, PDCP and/or RRC layers.
  • the baseband circuitry can include one or more audio digital signal processor(s) (DSP) 604f.
  • DSP audio digital signal processor
  • the audio DSP(s) 604f can be include elements for compression/decompression and echo cancellation and can include other suitable processing elements in other embodiments.
  • Components of the baseband circuitry can be suitably combined in a single chip, a single chipset, or disposed on a same circuit board in some embodiments.
  • some or all of the constituent components of the baseband circuitry 604 and the application circuitry 602 can be implemented together such as, for example, on a system on a chip (SOC).
  • SOC system on a chip
  • the baseband circuitry 604 can provide for communication compatible with one or more radio technologies.
  • the baseband circuitry 604 can support communication with an evolved universal terrestrial radio access network (EUTRAN) and/or other wireless metropolitan area networks (WMAN), a wireless local area network (WLAN), a wireless personal area network (WPAN).
  • EUTRAN evolved universal terrestrial radio access network
  • WMAN wireless metropolitan area networks
  • WLAN wireless local area network
  • WPAN wireless personal area network
  • multi-mode baseband circuitry Embodiments in which the baseband circuitry 604 is configured to support radio communications of more than one wireless protocol.
  • RF circuitry 606 can enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium.
  • the RF circuitry 606 can include switches, filters, amplifiers, etc. to facilitate the communication with the wireless network.
  • RF circuitry 606 can include a receive signal path which can include circuitry to down-convert RF signals received from the FEM circuitry 608 and provide baseband signals to the baseband circuitry 604.
  • RF circuitry 606 can also include a transmit signal path which can include circuitry to up- convert baseband signals provided by the baseband circuitry 604 and provide RF output signals to the FEM circuitry 608 for transmission.
  • the RF circuitry 606 can include a receive signal path and a transmit signal path.
  • the receive signal path of the RF circuitry 606 can include mixer circuitry 606a, amplifier circuitry 606b and filter circuitry 606c.
  • the transmit signal path of the RF circuitry 606 can include filter circuitry 606c and mixer circuitry 606a.
  • RF circuitry 606 can also include synthesizer circuitry 606d for synthesizing a frequency for use by the mixer circuitry 606a of the receive signal path and the transmit signal path.
  • the mixer circuitry 606a of the receive signal path can be configured to down-convert RF signals received from the FEM circuitry 608 based on the synthesized frequency provided by synthesizer circuitry 606d.
  • the amplifier circuitry 606b can be configured to amplify the down-converted signals and the filter circuitry 606c can be a low-pass filter (LPF) or band-pass filter (BPF) configured to remove unwanted signals from the down-converted signals to generate output baseband signals.
  • LPF low-pass filter
  • BPF band-pass filter
  • Output baseband signals can be provided to the baseband circuitry 604 for further processing.
  • the output baseband signals can be zero- frequency baseband signals, although this is not a requirement.
  • mixer circuitry 606a of the receive signal path can comprise passive mixers, although the scope of the embodiments is not limited in this respect.
  • the mixer circuitry 606a of the transmit signal path can be configured to up-convert input baseband signals based on the synthesized frequency provided by the synthesizer circuitry 606d to generate RF output signals for the FEM circuitry 608.
  • the baseband signals can be provided by the baseband circuitry 604 and can be filtered by filter circuitry 606c.
  • the filter circuitry 606c can include a low-pass filter (LPF), although the scope of the embodiments is not limited in this respect.
  • the mixer circuitry 606a of the receive signal path and the mixer circuitry 606a of the transmit signal path can include two or more mixers and can be arranged for quadrature downconversion and/or upconversion respectively.
  • the mixer circuitry 606a of the receive signal path and the mixer circuitry 606a of the transmit signal path can include two or more mixers and can be arranged for image rejection (e.g., Hartley image rejection).
  • the mixer circuitry 606a of the receive signal path and the mixer circuitry 606a can be arranged for direct downconversion and/or direct upconversion, respectively.
  • the mixer circuitry 606a of the receive signal path and the mixer circuitry 606a of the transmit signal path can be configured for super-heterodyne operation.
  • the output baseband signals and the input baseband signals can be analog baseband signals, although the scope of the embodiments is not limited in this respect.
  • the output baseband signals and the input baseband signals can be digital baseband signals.
  • the RF circuitry 606 can include analog-to-digital converter (ADC) and digital-to-analog converter (DAC) circuitry and the baseband circuitry 604 can include a digital baseband interface to communicate with the RF circuitry 606.
  • ADC analog-to-digital converter
  • DAC digital-to-analog converter
  • a separate radio IC circuitry can be provided for processing signals for each spectrum, although the scope of the
  • the synthesizer circuitry 606d can be a fractional-N synthesizer or a fractional N/N+8 synthesizer, although the scope of the embodiments is not limited in this respect as other types of frequency synthesizers can be suitable.
  • synthesizer circuitry 606d can be a delta-sigma synthesizer, a frequency multiplier, or a synthesizer comprising a phase-locked loop with a frequency divider.
  • the synthesizer circuitry 606d can be configured to synthesize an output frequency for use by the mixer circuitry 606a of the RF circuitry 606 based on a frequency input and a divider control input.
  • the synthesizer circuitry 606d can be a fractional N/N+8 synthesizer.
  • frequency input can be provided by a voltage controlled oscillator (VCO), although that is not a requirement.
  • VCO voltage controlled oscillator
  • Divider control input can be provided by either the baseband circuitry 604 or the applications processor 602 depending on the desired output frequency.
  • a divider control input e.g., N
  • N can be determined from a look-up table based on a channel indicated by the applications processor 602.
  • Synthesizer circuitry 606d of the RF circuitry 606 can include a divider, a delay-locked loop (DLL), a multiplexer and a phase accumulator.
  • DLL delay-locked loop
  • the divider can be a dual modulus divider (DMD) and the phase accumulator can be a digital phase accumulator (DPA).
  • DMD can be configured to divide the input signal by either N or N+8 (e.g., based on a carry out) to provide a fractional division ratio.
  • the DLL can include a set of cascaded, tunable, delay elements, a phase detector, a charge pump and a D-type flip-flop.
  • the delay elements can be configured to break a VCO period up into Nd equal packets of phase, where Nd is the number of delay elements in the delay line. In this way, the DLL provides negative feedback to help ensure that the total delay through the delay line is one VCO cycle.
  • synthesizer circuitry 606d can be configured to generate a carrier frequency as the output frequency, while in other embodiments, the output frequency can be a multiple of the carrier frequency (e.g., twice the carrier frequency, four times the carrier frequency) and used in conjunction with quadrature generator and divider circuitry to generate multiple signals at the carrier frequency with multiple different phases with respect to each other.
  • the output frequency can be a LO frequency (f L o)-
  • the RF circuitry 606 can include an IQ/polar converter.
  • FEM circuitry 608 can include a receive signal path which can include circuitry configured to operate on RF signals received from one or more antennas 680, amplify the received signals and provide the amplified versions of the received signals to the RF circuitry 606 for further processing.
  • FEM circuitry 608 can also include a transmit signal path which can include circuitry configured to amplify signals for transmission provided by the RF circuitry 606 for transmission by one or more of the one or more antennas 680.
  • the FEM circuitry 608 can include a TX/RX switch to switch between transmit mode and receive mode operation.
  • the FEM circuitry can include a receive signal path and a transmit signal path.
  • the receive signal path of the FEM circuitry can include a low-noise amplifier (LNA) to amplify received RF signals and provide the amplified received RF signals as an output (e.g., to the RF circuitry 606).
  • LNA low-noise amplifier
  • the transmit signal path of the FEM circuitry 608 can include a power amplifier (PA) to amplify input RF signals (e.g., provided by RF circuitry 606), and one or more filters to generate RF signals for subsequent transmission (e.g., by one or more of the one or more antennas 680.
  • PA power amplifier
  • the UE device 600 can include additional elements such as, for example, memory/storage, display, camera, sensor, and/or input/output (I/O) interface.
  • additional elements such as, for example, memory/storage, display, camera, sensor, and/or input/output (I/O) interface.
  • Examples herein can include subject matter such as a method, means for performing acts or blocks of the method, at least one machine-readable medium including executable instructions that, when performed by a machine (e.g., a processor with memory or the like) cause the machine to perform acts of the method or of an apparatus or system for concurrent communication using multiple communication technologies according to embodiments and examples described.
  • a machine e.g., a processor with memory or the like
  • Example 1 is an architecture configured to be employed within one or more user evolved node Bs (eNodeBs).
  • the architecture includes frame logic and a transmit component.
  • the frame logic is configured to generate a frame using time division duplexing (TDD) and a frame having a plurality of subframes.
  • the subframes include a special subframe having a downlink/uplink proportional configuration.
  • the transmit component is configured to transmit the frame as part of a transmit signal using time division duplexing (TDD).
  • Example 2 includes the subject matter of Example 1 , including or omitting optional elements, where the special subframe has downlink and uplink fields in accordance with the downlink/uplink proportional configuration.
  • Example 3 includes the subject matter of any one of Examples 1-2, including or omitting optional elements, where the special subframe includes one or more guard periods separating the downlink and uplink fields.
  • Example 4 includes the subject matter of any one of Examples 1-3, including or omitting optional elements, where the guard periods have a length based on adjacent portions of the special subframe.
  • Example 5 includes the subject matter of any one of Examples 1-4, including or omitting optional elements, where the guard periods have a length equal to a transmitter transient period upon transitions, wherein the transitions include a transition from an uplink field to a downlink field.
  • Example 6 includes the subject matter of any one of Examples 1-5, including or omitting optional elements, where the uplink fields and the downlink fields have varied lengths.
  • Example 7 includes the subject matter of any one of Examples 1-6, including or omitting optional elements, where a guard period after and adjacent to a downlink field and prior to and adjacent to an uplink field is set to a length of zero.
  • Example 8 includes the subject matter of any one of Examples 1-7, including or omitting optional elements, further including retransmission logic configured to determine retransmission parameters based on system parameters.
  • Example 9 includes the subject matter of any one of Examples 1-8, including or omitting optional elements, where the system parameters include a number of subframes, a transmitter processing delay and a receiver processing delay.
  • Example 10 includes the subject matter of any one of Examples 1-9, including or omitting optional elements, where the retransmission parameters include a downlink ACK offset, a downlink retransmission offset, an uplink ACK offset and an uplink retransmission offset.
  • Example 11 is an architecture configured to be employed within one or more evolved node Bs (eNodeBs).
  • the architecture includes frame logic, retransmission logic, and a transmit component.
  • the frame logic is configured to generate a frame having a downlink/uplink proportional configuration and associated with system parameters.
  • the system parameters include a number of subframes and a processing delay.
  • the retransmission logic is configured to determine retransmission parameters based on the system parameters and to perform retransmission based on the determined retransmission parameters.
  • the transmit component is configured to transmit the frame and retransmitted subframes as part of a transmit signal using time division duplexing (TDD).
  • TDD time division duplexing
  • Example 12 includes the subject matter of Examples 11 , including or omitting optional elements, where the retransmission parameters include a downlink ACK offset, which is based at least partially on a receiver processing delay.
  • Example 13 includes the subject matter of any one of Examples 11-12, including or omitting optional elements, where the retransmission parameters include a downlink retransmission offset, which is at least partially based on a transmitter processing delay.
  • Example 14 includes the subject matter of any one of Examples 11-13, including or omitting optional elements, where the retransmission parameters include an uplink ACK offset, which is based at least partially on a transmitter processing delay.
  • Example 15 includes the subject matter of any one of Examples 11-14, including or omitting optional elements, where the retransmission parameters include an uplink retransmission offset, which is based at least partially on a receiver processing delay.
  • Example 16 includes the subject matter of any one of Examples 11-15, including or omitting optional elements, where the retransmission logic is configured to select the downlink/uplink proportional configuration from a plurality of frame
  • Example 17 is one or more computer-readable media having instructions that, when executed, cause one or more user equipment (UEs) to perform operations.
  • the operations cause the one or more UEs to select a downlink/uplink frame configuration from a plurality of frame configurations based on system parameters, configure lengths for downlink transmission fields, uplink transmission fields and guard periods in a plurality of subframes for a frame having the selected downlink/uplink frame
  • UEs user equipment
  • Example 18 includes the subject matter of Example 17, including or omitting optional elements, where the downlink/uplink frame configuration is selected according to a downlink/uplink ratio.
  • Example 19 includes the subject matter of any one of Examples 17-18, including or omitting optional elements, where the instructions further cause the eNodeB to retransmit subframes according to the determined retransmission parameters.
  • Example 20 includes the subject matter of any one of Examples 17- 9, including or omitting optional elements, where the selected downlink/uplink frame configuration includes a special frame having a downlink to uplink ratio of more than 90 percent.
  • Example 21 includes the subject matter of any one of Examples 17-20, including or omitting optional elements, where the guard periods are allocated a length based on prior and subsequent adjacent transmission fields.
  • Example 22 is an apparatus to be employed within an evolved node B
  • the apparatus includes a means for selecting a downlink/uplink frame configuration from a plurality of frame configurations based on system parameters; a means for configuring frame lengths for downlink transmission fields, uplink

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

Abstract

La présente invention concerne une architecture configurée pour être utilisée à l'intérieur d'un ou de plusieurs nœuds B évolués (eNB) utilisateurs. L'architecture comprend une logique de trame et un composant de transmission. La logique de trame est configurée pour générer une trame à l'aide d'un duplexage par répartition dans le temps (TDD) et une trame comprenant une pluralité de sous-trames. Les sous-trames comprennent une sous-trame spéciale ayant une configuration proportionnelle en liaison descendante/montante. Le composant de transmission est configuré pour transmettre la trame en tant que partie d'un signal de transmission au moyen d'un duplexage par répartition dans le temps (TDD).
PCT/US2015/000449 2015-06-18 2015-12-23 Structure de trame et procédure de demande de retransmission automatique hybride WO2016204714A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100097964A1 (en) * 2007-02-23 2010-04-22 Telefonaktiebolaget L M Ericsson (Publ) Method And A Device For Enhanced Performance In A Cellular Wireless TDD System
US20100097963A1 (en) * 2007-01-16 2010-04-22 David Astely Method and a Device for Enhanced Performance in a Cellular Wireless TDD System
US20120314592A1 (en) * 2011-04-29 2012-12-13 Telefonaktiebolaget Lm Ericsson (Publ) Decentralized Control of Interference Reduction in a Wireless Communication System

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100097963A1 (en) * 2007-01-16 2010-04-22 David Astely Method and a Device for Enhanced Performance in a Cellular Wireless TDD System
US20100097964A1 (en) * 2007-02-23 2010-04-22 Telefonaktiebolaget L M Ericsson (Publ) Method And A Device For Enhanced Performance In A Cellular Wireless TDD System
US20120314592A1 (en) * 2011-04-29 2012-12-13 Telefonaktiebolaget Lm Ericsson (Publ) Decentralized Control of Interference Reduction in a Wireless Communication System

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