US20090296833A1 - Apparatus for generating a set of radio parameters, a transmitter and a receiver - Google Patents

Apparatus for generating a set of radio parameters, a transmitter and a receiver Download PDF

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US20090296833A1
US20090296833A1 US11/917,734 US91773406A US2009296833A1 US 20090296833 A1 US20090296833 A1 US 20090296833A1 US 91773406 A US91773406 A US 91773406A US 2009296833 A1 US2009296833 A1 US 2009296833A1
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symbol
parameters
period
transmission time
time interval
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English (en)
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Mamoru Sawahashi
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NTT Docomo Inc
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NTT Docomo Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2603—Signal structure ensuring backward compatibility with legacy system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions

Definitions

  • the present invention relates to an apparatus for generating a set of radio parameters, a transmitter, and a receiver.
  • Non-Patent Reference 1 for an outlook of future communication systems.
  • an OFDM (Orthogonal Frequency Division Multiplexing) system is promising as a next generation communication system.
  • a single symbol is generated by attaching a guard interval to an effective symbol including information to be transmitted, and multiple symbols are transmitted during a predetermined transmission time interval (TTI).
  • TTI transmission time interval
  • the guard interval consists of part of information within the effective symbol.
  • the guard interval may be also called a cyclic prefix (CP) or overhead.
  • a receiver receives data on paths with various propagation delays.
  • the OFDM system if the amount of propagation delay falls within the period of the guard interval, inter-symbol interference can be effectively reduced.
  • a relatively large guard interval allows delay waves to be advantageously combined. This is advantageous particularly in communications with an extremely large cell radius and in simultaneous transmission of the same information from different cells to a mobile station in accordance with the multicast scheme.
  • the guard interval includes only part of the effective symbol, and thus a larger period of the guard interval is not preferable from the viewpoint of information transmission efficiency.
  • satisfactory communication quality may be maintained under environments with relatively short propagation delay such as urban areas and indoor areas or environments available for the unicast scheme by setting a relatively short guard interval.
  • the aforementioned transmission time interval controls various parameters for information transmission. For example, parameters such as a unit of packet transmission, a frequency of updating a data modulation scheme and a channel coding rate in the case of MCS (Modulation and Coding Scheme), a unit of error correction coding, a unit of retransmission in the case of ARQ (Automatic Repeat reQuest), and a unit of packet scheduling are determined by the TTI. Because a control channel, which includes control information such as MCS information, retransmission information, and scheduling information, is used for demodulating a data channel, the control channel has to be used along with the data channel during each TTI. On the other hand, a user can transmit information during one or more TTIs, depending on the contents of information to be transmitted.
  • MCS Modulation and Coding Scheme
  • ARQ Automatic Repeat reQuest
  • control channels for the respective TTIs are multiplexed for transmission.
  • the control channel may not be always necessary for each TTI, because it is not necessary to change radio parameters for each TTI.
  • the situation where the control channel is used for transmission during each TTI is not preferable from the viewpoint of data transmission efficiency.
  • An OFDM mobile communication system is under discussion, where a wide frequency band is divided into multiple frequency blocks and a unit of information transmission in the frequency direction is defined by the frequency block.
  • the frequency block is also referred to as a chunk (or a resource block), and a single frequency block includes one or more subcarriers.
  • a user can transmit information with one or more frequency blocks.
  • multiple control channels for the respective frequency blocks are multiplexed for transmission, because the data channel is used for transmission for each frequency block.
  • These control channels may include information about frequency block allocation in addition to the aforementioned MCS information and so on.
  • the control channel may not be always necessary for each frequency block. The situation where the control channel is used for transmission for each frequency block is not preferable from the viewpoint of data transmission efficiency.
  • the present invention addresses at least one of the aforementioned problems. It is a general object of the present invention to provide a transmitter, a receiver, and an apparatus for generating a radio parameter, which can improve information transmission efficiency in an OFDM mobile transmission system.
  • an OFDM transmitter which includes:
  • a data modulation and channel coding unit configured to perform data modulation and channel coding for a data channel with a modulation level and a channel coding rate updated for each transmission time interval
  • a multiplexing unit configured to multiplex a control channel and the data channel for each transmission time interval
  • an adjusting means configured to adjust a length of the transmission time interval.
  • FIG. 1 shows a case where control channels and data channels are used for transmission.
  • FIG. 2 shows a case where control channels and data channels are used for transmission.
  • FIG. 3 shows a (first) block diagram for illustrating a transmitter in accordance with one embodiment of the present invention.
  • FIG. 4 shows a (second) block diagram for illustrating a transmitter in accordance with one embodiment of the present invention.
  • FIG. 5 shows a block diagram for illustrating a receiver in accordance with one embodiment of the present invention.
  • FIG. 6 shows a relationship between two types of TTI (a long TTI and a short TTI) and a frame.
  • FIG. 7 shows a case where control channels and data channels are used for transmission.
  • FIG. 8 shows a case where control channels and data channels are used for transmission.
  • FIG. 9 shows symbol formats respectively defined by sets of symbol parameters derived in accordance with one embodiment of the present invention.
  • FIG. 10 shows various sets of symbol parameters derived in accordance with one embodiment of the present invention.
  • FIG. 11 shows symbol formats respectively defined by sets of symbol parameters derived in accordance with one embodiment of the present invention.
  • a transmission time interval is adjusted depending on communication conditions.
  • a control channel is multiplexed with a data channel for each TTI.
  • the control channel may be multiplexed into part of subcarriers. Increasing a unit of information transmission in the time direction and/or the frequency direction depending on communication conditions can reduce a frequency of inserting (allocating) the control channel, and can improve data transmission efficiency.
  • the control channel may include information about a modulation level and a channel coding rate.
  • the transmitter may store two or more sets of parameters, each of which defines a symbol including a guard interval with a different period and an effective symbol with the same period. The transmitter can determine a symbol format-depending on communication conditions without delay.
  • an apparatus for generating a set of radio parameters used for an OFDM mobile communication system which transmits and receives multiple symbols for each transmission time interval, each of the multiple symbols including a guard interval and an effective symbol.
  • the apparatus includes a first deriving unit configured to derive a second set of symbol parameters, so that a period of an effective symbol defined by a first set of symbol parameters is equal to a period of an effective symbol defined by the second set of symbol parameters, and a period of a guard interval defined by the first set of symbol parameters is different from a period of a guard interval defined by the second set of symbol parameters.
  • the apparatus also includes a second deriving unit configured to derive a third set of symbol parameters, so that a share of a guard interval in a symbol defined by the first set of symbol parameters is equal to a share of a guard interval in a symbol defined by the third set of symbol parameters, and a length of the symbol defined by the first set of symbol parameters is different from a length of the symbol defined by the third set of symbol parameters.
  • a length of the transmission time interval, a length of the symbol, or both a length of the transmission time interval and a length of the symbol is adjusted so that an integral number of symbols are transmitted during a single transmission time interval.
  • the apparatus can effectively derive a set of radio parameters which has a desired number of subcarriers to be used, a desired loss rate (a share of a guard interval in a symbol), and a desired number of symbols within one or more TTIs. For example, assuming that periods of effective symbols are mutually equal (i.e. subcarrier intervals are mutually equal), any radio communication device can always use the same signal processing for OFDM modulation and demodulation (Inverse Fast Fourier Transform and Fast Fourier Transform) even if any set of symbol parameters is used. Also assuming that the loss rate is kept constant, data transmission efficiency can be also kept constant even if any set of symbol parameters is used.
  • a set of symbol parameters is derived so that the subcarrier interval and the loss rate have desired values.
  • the number of subcarriers defined by a certain set of symbol parameters may be determined to be an integral multiple of the number of subcarriers defined by another set of symbol parameters.
  • a set of symbol parameters with a significantly different period of the guard interval can be derived while controlling the subcarrier interval and the loss rate.
  • the number of symbols for each transmission time interval can be adjusted to be an integer by extending the transmission time interval. Such an adjustment is preferable from the viewpoint of simplified signal processing.
  • OFDM Orthogonal Frequency Division Multiplexing
  • FIG. 3 shows a (first) block diagram for illustrating a transmitter in accordance with one embodiment of the present invention.
  • a base station includes N D data channel processing units 302 - 1 to 302 -N D , a control channel processing unit 304 , a multiplexing unit (MUX) 306 , an Inverse Fast Fourier Transform (IFFT) unit 308 , a guard interval insertion unit 310 , a digital to analog (D/A) conversion unit 312 , a symbol parameter adjusting unit 320 , and a TTI adjusting unit 321 .
  • MUX multiplexing unit
  • IFFT Inverse Fast Fourier Transform
  • the N D data channel processing units 302 - 1 to 302 -N D mutually have the same configuration and function, and the data channel processing unit 302 - 1 is representatively described hereinafter.
  • the data channel processing unit 302 - 1 includes a turbo coder 322 , a data modulator 324 , an interleaver 326 , and a serial to parallel (S/P) conversion unit 328 .
  • the control channel processing unit 304 includes a convolution coder 342 , a QPSK modulator 344 , an interleaver 346 , and a serial to parallel (S/P) conversion unit 348 .
  • the N D data channel processing units 302 - 1 to 302 -N D perform baseband processing for transmitting traffic information data in the OFDM system.
  • the turbo coder 322 performs encoding for enhancing error tolerance of the traffic information data.
  • the data modulator 324 modulates the traffic information data in accordance with a proper modulation scheme such as QPSK, 16QAM and 64QAM. In the case of adaptive modulation and coding (AMC), this modulation scheme is modified if needed.
  • the interleaver 326 sorts the traffic information data in accordance with a predetermined pattern.
  • the serial to parallel (S/P) conversion unit 328 converts a serial signal sequence (stream) into parallel signal sequences. The number of parallel signal sequences may be determined based on the number of subcarriers.
  • the data channel processing units 302 - 1 to 302 -N D perform the aforementioned operations for each transmission time interval supplied by the TTI adjusting unit 321 .
  • the control channel processing unit 304 performs baseband processing for transmitting control information data in OFDM system.
  • the convolution coder 342 performs encoding for enhancing error tolerance of the control information data.
  • the QPSK modulator 344 modulates the control information data in accordance with the QPSK modulation scheme. Any other proper modulation scheme may be employed, however, the QPSK modulation scheme with a lower number of modulation levels is employed in this embodiment due to the lesser amount of control information data.
  • the interleaver 346 sorts the control information data in accordance with a predetermined pattern.
  • the serial to parallel (S/P) conversion unit 348 converts a serial signal sequence into parallel signal sequences. The number of parallel signal sequences may be determined based on the number of subcarriers.
  • the multiplexing unit (MUX) 306 multiplexes the processed (modulated, encoded, etc.) traffic information data and the processed control information data.
  • a pilot channel (reference signal) may be input into the multiplexing unit 306 and multiplexed.
  • a pilot channel may be input into the serial to parallel conversion unit 348 and multiplexed in the frequency direction, as shown by the dotted line in FIG. 3 .
  • the multiplexing may be any scheme of time multiplexing, frequency multiplexing, or both time and frequency multiplexing.
  • the Inverse Fast Fourier Transform unit 308 performs Inverse Fast Fourier Transform for an input signal, and then performs OFDM modulation.
  • the guard interval insertion unit 310 generates a symbol in compliance with the OFDM system by adding a guard interval to the modulated signal.
  • the guard interval is generated by duplicating part of the head or tail of the symbol to be transmitted.
  • the digital to analog (D/A) conversion unit 312 converts a baseband digital signal into an analog signal.
  • the symbol parameter adjusting unit 320 adjusts symbol parameters for use in communications.
  • the symbol parameters include some information for defining the format of the OFDM symbols, and include a set of information items for defining values such as the period T GI of the guard interval, the period of the effective symbol, the share of the guard interval in a single symbol, and the subcarrier interval ⁇ f. It should be noted that the period of the effective symbol is equal to the reciprocal of the subcarrier interval 1/ ⁇ f.
  • the symbol parameter adjusting unit 320 determines a proper set of symbol parameters depending on communication conditions or instructions from other devices. For example, the symbol parameter adjusting unit 320 may selectively use a different set of symbol parameters based on whether communications are carried out in accordance with the multicast scheme.
  • a set of symbol parameters for defining the guard interval with a shorter period may be employed in the unicast scheme, whereas a set of symbol parameters for defining the guard interval with a longer period may be employed in the multicast scheme.
  • the symbol parameter adjusting unit 320 may compute and derive a proper set of symbol parameters on a case-by-case basis.
  • the symbol parameter adjusting unit 320 may store multiple sets of symbol parameters in a memory in advance and may select one of the sets of symbol parameters if needed. The manner of deriving the set of symbol parameters will be described below.
  • the TTI adjusting unit 321 determines the length of the transmission time interval (TTI), and supplies the determined length of the transmission time interval to each data channel processing unit 302 - 1 to 302 -N D , the multiplexing unit 306 , and the symbol parameter adjusting unit 320 .
  • the length of the TTI may be determined based on information determined by an application such as a traffic size, information about the base station such as a frequency bandwidth, and/or information about a service type such as multicasting, unicasting, and broadcasting.
  • the transmitter may notify the receiver of the determined length of the transmission time interval by means of some control signals. For example, the length of the transmission time interval may be determined when a call is connected.
  • FIG. 4 shows a (second) block diagram for illustrating a transmitter in accordance with one embodiment of the present invention.
  • the RF transmission unit includes an orthogonal modulator 402 , a local oscillator 404 , a bandpass filter 406 , a mixer 408 , a local oscillator 410 , a bandpass filter 412 , and a power amplifier 414 .
  • the orthogonal modulator 402 generates an in-phase component (I) and a quadrature component (Q) of an intermediate frequency from an input signal.
  • the bandpass filter 406 removes a frequency component unnecessary for the intermediate frequency band.
  • the mixer 408 uses the local oscillator 410 to convert (up-convert) the intermediate frequency signal into a high frequency signal.
  • the bandpass filter 412 removes an unnecessary frequency component.
  • the power amplifier 414 amplifies signal power for radio transmission from an antenna 416 .
  • Traffic information data input into the data channel processing unit in FIG. 3 is encoded by the turbo coder 322 , is modulated by the data modulation unit 324 , is sorted by the interleaver 326 , and is made parallel by the serial to parallel converter 328 .
  • control information data is encoded, modulated, interleaved, and made parallel.
  • Data channels and control channels are multiplexed for each subcarrier and for each transmission time interval by the multiplexing unit 306 , and are OFDM modulated by the Inverse Fast Fourier Transform unit 308 . Then, a guard interval is added to the modulated signal for outputting baseband OFDM symbols.
  • the baseband signal is converted into an analog signal.
  • the converted signal is orthogonally modulated by the orthogonal modulator 402 in the RF processing unit in FIG. 4 . After band-limiting, the modulated signal is properly amplified and transmitted.
  • FIG. 5 shows a block diagram for illustrating a receiver in accordance with one embodiment of the present invention.
  • the receiver includes an antenna 502 , a low noise amplifier 504 , a mixer 506 , a local oscillator 508 , a bandpass filter 510 , an automatic gain control unit 512 , an orthogonal detector 514 , a local oscillator 516 , an analog to digital conversion unit 518 , a symbol timing detection unit 520 , a guard interval removal unit 522 , a Fast Fourier Transform unit 524 , a demultiplexer 526 , a channel estimation unit 528 , a channel compensation unit 530 , a parallel to serial (P/S) conversion unit 532 , a channel compensation unit 534 , a deinterleaver 536 , a data demodulation unit 537 , a turbo decoder 538 , a Viterbi decode
  • the low noise amplifier 504 properly amplifies a signal received via the antenna 502 .
  • the amplified signal is converted (down-converted) into an intermediate frequency by the mixer 506 and the local oscillator 508 .
  • the bandpass filter 510 removes an unnecessary frequency component.
  • the automatic gain control unit 512 controls the gain of the amplifier so as to properly maintain the signal level.
  • the orthogonal detector 514 uses the local oscillator 516 to perform orthogonal demodulation based on an in-phase component (I) and a quadrature component (Q) of the received signal.
  • the analog to digital conversion unit 518 converts an analog signal into a digital signal.
  • the symbol timing detection unit 520 detects timing of symbols (symbol boundary) based on the digital signal.
  • the guard interval removal unit 522 removes a portion corresponding to the guard interval from the received signal.
  • the Fast Fourier Transform unit 524 performs Fast Fourier Transform for an input signal, and then performs OFDM demodulation.
  • the demultiplexer 526 extracts pilot channels, control channels, and data channels multiplexed into a received signal. This extraction is performed corresponding to multiplexing at the transmitter (operations in the multiplexing unit 306 in FIG. 3 ).
  • the channel estimation unit 528 uses the pilot channels to estimate conditions of the propagation path, and outputs a control signal for adjusting the amplitude and phase to compensate for the channel fluctuations. This control signal is output for each subcarrier.
  • the channel compensation unit 530 adjusts the amplitude and phase of the data channels for each subcarrier based on information input from the channel estimation unit 528 .
  • the parallel to serial (P/S) conversion unit 532 converts parallel signal sequences into a serial signal sequence.
  • the channel compensation unit 534 adjusts the amplitude and phase of the control channels for each subcarrier based on information input from the channel estimation unit 528 .
  • the deinterleaver 536 sorts signals in accordance with a predetermined pattern.
  • the predetermined pattern corresponds to the inverse pattern for sorting in the interleaver ( 326 in FIG. 3 ) in the transmitter.
  • the data demodulation unit 537 performs demodulation for the received signal for each transmission time interval, corresponding to the modulation scheme in the transmitter.
  • the turbo coder 538 and the Viterbi decoder 540 decode traffic information data and control information data, respectively.
  • the symbol parameter adjusting unit 542 determines symbol parameters for use in communications as is the case with the symbol parameter adjusting unit 320 in FIG. 3 .
  • the symbol parameter adjusting unit 542 may compute and derive a proper set of symbol parameters on a case-by-case basis.
  • the symbol parameter adjusting unit 542 may store multiple sets of symbol parameters in a memory in advance and access them if needed. The manner of deriving the set of symbol parameters will be described below.
  • the TTI adjusting unit 544 determines the length of the transmission time interval, and supplies the determined length of the transmission time interval to the demultiplexer 526 , the deinterleaver 536 , the data demodulation unit 537 , the turbo decoder 538 , and the symbol parameter adjusting unit 542 .
  • the transmitter may notify the receiver of the determined length of the transmission time interval by means of some control signals. For example, the length of the transmission time interval may be determined when a call is connected.
  • a signal received via an antenna is converted into a digital signal after amplification, frequency conversion, band-limiting, and orthogonal demodulation in the RF reception unit.
  • the Fast Fourier Transform unit 524 performs an OFDM demodulation for a signal without a guard interval.
  • the demodulated signal is demultiplexed into pilot channels, control channels, and data channels in the demultiplexer 526 .
  • the pilot channels are input to the channel estimation unit 528 , and a compensation signal for compensating for channel fluctuations is output from the channel estimation unit 528 for each subcarrier.
  • the data channels are compensated for by means of the compensation signal for each subcarrier and are converted into a serial signal.
  • the converted signal is sorted by the deinterleaver 526 in accordance with the inverse pattern for sorting in the interleaver and is decoded in the turbo decoder 538 .
  • the control channels are also compensated for by means of the compensation signal and are decoded in the Viterbi decoder 540 .
  • signal processing is carried out with use of the decoded data and control channels.
  • FIG. 6 shows data transmission in accordance with the present embodiment.
  • the transmission time interval TTI
  • the transmission time interval TTI
  • two types of TTI a long TTI and a short TTI
  • the length of the frame is kept constant in order to meet the requirement for ensuring backward compatibility with existing communication systems.
  • the long transmission time interval is twice longer than the short transmission time interval.
  • the length of the frame is equal to 10 ms
  • the length of the short TTI is equal to 0.5 ms
  • the length of the long TTI is equal to 1.0 ms.
  • a single frame includes 20 TTIs, whereas in the case of the long TTI, a single frame includes only 10 TTIs.
  • two types of TTI are provided in FIG. 6 for ease of explanation, more types of TTI may be provided.
  • the TTI controls various parameters for information transmission. For example, parameters such as a unit of packet transmission, a frequency of updating a data modulation scheme and a channel coding rate in the case of MCS, a unit of error correction coding, a unit of retransmission in the case of ARQ (Automatic Repeat reQuest), and a unit of packet scheduling are determined by the TTI. Because a control channel, which includes control information such as MCS information, retransmission information, and scheduling information, is used for demodulating a data channel, the control channel has to be used along with the data channel during each TTI. A longer TTI can reduce a frequency of inserting (allocating) the control channel, and can improve information transmission efficiency (see FIG. 7 ).
  • This embodiment is also applicable to the case where a wide frequency band is divided into multiple frequency blocks (or chunks) and a unit of information transmission in the frequency direction is defined by the frequency block.
  • the control channel may not be used for transmission for every chunk, but may be used for transmission only for a single chunk (see FIG. 8 ).
  • Flexibly changing a unit of information transmission in the time direction and/or the frequency direction can prevent a frequency of inserting (allocating) the control channel from unnecessarily increasing, and can improve information transmission efficiency. Adjusting the length of the TTI is advantageous particularly in the case of a relatively narrow frequency band, because transmission efficiency is directly related to transmission delay when an available frequency band is narrow as shown in FIG. 7 .
  • the set of symbol parameters defines the subcarrier interval, the sampling frequency, the period of the effective symbol, the period of the guard interval, the number of symbols in a single TTI, and so on. It should be noted that all of the parameters cannot be determined independently. For example, the subcarrier interval and the period of the effective symbol have a reciprocal relationship with each other. Also, the period of a single TTI is derived by multiplying the period of one symbol (total period of the guard interval and the effective symbol) with the number of symbols. Three methods of deriving a second set of symbol parameters from a first set of symbol parameters are described below.
  • period of effective symbol 256 samples (44.4 ⁇ s)
  • guard interval 32 samples (5.5 ⁇ s)
  • the loss rate means a share of the guard interval in one symbol.
  • the guard interval is a redundant portion from the viewpoint of improved data transmission efficiency.
  • the loss rate ⁇ , the period T GI of the guard interval, and the period T eff of the effective symbol have the relationship as follows;
  • a first method of deriving a set of symbol parameters decreases the number of symbols in a single TTI and increases the period of the guard interval while keeping the subcarrier interval constant. For example, if a first set of symbol parameters now includes 10 symbols in a single TTI, the number of symbols is reduced to 9. Then, the period corresponding to the reduced one symbol (288 samples) is equally divided into 9 portions, each of which is assigned to the guard interval. As a result, as shown in FIG. 9(B) , while the period of the effective symbol (256 samples) is kept equal, the single TTI includes 9 symbols with longer periods of the guard interval.
  • a second set of symbol parameters derived in this manner has the parameter values as follows.
  • period of effective symbol 256 samples (44.4 ⁇ s)
  • guard interval 64 samples (11.1 ⁇ s)
  • the second set of symbol parameters has the parameter values as follow ( FIG. 9(C) ).
  • period of effective symbol 256 samples (44.4 ⁇ s)
  • guard interval 104 samples (18.1 ⁇ s)
  • the period of the effective symbol is always kept constant, and thus the subcarrier interval can also be kept constant.
  • the period of the guard interval and the number of symbols vary depending on the set of symbol parameters.
  • a second method of deriving a set of symbol parameters changes the number of symbols in a single TTI while maintaining a constant loss rate.
  • the share of the guard interval and the effective symbol has to be kept constant so as to fulfill the constant loss rate.
  • the first set of symbol parameters as shown in FIG. 9(D) , the periods of the guard interval and the effective symbol are doubled respectively, and accordingly the number of symbols in one TTI can be reduced to 5 symbols.
  • the second set of symbol parameters has the parameter values as follows.
  • the second set of symbol parameters has the parameter values as follows.
  • the period of a single TTI be extended from 0.5 ms to 1.0 ms, for example, so that an integral number of symbols are included in the single TTI.
  • the constant loss rate can be maintained, and thus it is possible to derive sets of symbol parameters with equal data transmission efficiency.
  • the loss rate increases accordingly.
  • a third method of deriving a set of symbol parameters is configured as a combination of the first method and the second method.
  • the first method may be applied to a first set of symbol parameters to derive a second set of symbol parameters
  • the second method may be applied to the second set of symbol parameters to derive a third set of symbol parameters.
  • the number of symbols is modified while maintaining the constant loss rate. For example, if the periods of the guard interval and the effective symbol are duplicated respectively, the third set of symbol parameters has the parameter values as follows ( FIG. 9(F) ).
  • subcarrier interval 11.25 kHz
  • period of effective symbol 512 samples (88.8 ⁇ s)
  • guard interval 128 samples (22.2 ⁇ s)
  • the period of a single TTI be extended to 1.0 ms, for example, so that an integral number of symbols are included in the single TTI.
  • the third set of symbol parameters derived in this manner includes the same loss rate (20%) as the set of symbol parameters shown in FIG. 9(B) , and includes the same subcarrier interval (11.25 kHz) as the set of symbol parameters shown in FIG. 9(D) .
  • the period of the guard interval (128 samples) for the third set of symbol parameters is longer than any ones (64 samples) shown in FIGS. 9(B) and 9(D) .
  • the third method it is possible to efficiently derive a set of symbol parameters with a predetermined relationship between the subcarrier interval and the loss rate.
  • all of the sets of symbol parameters are prepared for the same sampling frequency, it is not necessary to change clock frequency for each of the sets of parameters.
  • 8 sets of symbol parameters can be derived by applying the first method and/or the second method to the first set of symbol parameters.
  • new sets of symbol parameters have been derived in such a manner that the subcarrier interval and the number of symbols can be reduced from those of the reference set of symbol parameters.
  • such new sets of symbol parameters may be derived in such a manner that the subcarrier interval and the number of symbols can be increased from those of the reference set of symbol parameters.
  • the length of the transmission time interval is adjusted.
  • the length of the guard interval and/or the effective symbol is modified.
  • the first set of symbol parameters is determined as follows. These parameter values are the same as those in FIG. 9(A) , except that the period of one TTI is extended from 0.5 ms to 1.0 ms.
  • period of effective symbol 256 samples (44.4 ⁇ s)
  • a first method of deriving a set of symbol parameters extends the period of the TTI, decreases the number of symbols in the single TTI, and increases the period of the guard interval while keeping the subcarrier interval constant. For example, if a first set of symbol parameters now includes 20 symbols in a single TTI, the number of symbols is reduced to 19. Then, the period corresponding to the reduced one symbol (288 samples) is equally divided into 19 portions, each of which is assigned to the guard interval. As a result, as shown in FIG. 11(B) , while the period of the effective symbol (256 samples) is kept equal, the single TTI includes 19 symbols with longer periods of the guard interval.
  • a second set of symbol parameters derived in this manner has the parameter values as follows.
  • period of effective symbol 256 samples (44.4 ⁇ s)
  • guard interval 47.16 samples (8.187 ⁇ s)
  • the second set of symbol parameters has the parameter values as follow ( FIG. 11(C) ).
  • period of effective symbol 256 samples (44.4 ⁇ s)
  • guard interval 64 samples (11.1 ⁇ s)
  • the period of the effective symbol is always kept constant, and thus the subcarrier interval can also be kept constant.
  • the period of the guard interval and the number of symbols vary depending on the set of symbol parameters.
  • the number of symbols in one TTI is reduced by one symbol or two symbols, and the period corresponding to the reduced symbol(s) is equally divided into the guard intervals in the remaining symbols.
  • the examples shown in FIG. 9(B) , 9 (C), 11 (B), and 11 (C) the number of symbols in one TTI is reduced by one symbol or two symbols, and the period corresponding to the reduced symbol(s) is equally divided into the guard intervals in the remaining symbols.
  • the transmission time interval is extended twice as the transmission time interval in the examples shown FIG. 9 .
  • the loss rate is equal to 20% in the example shown in FIG. 9(B)
  • the loss rate is reduced to 15.5% in the example shown in FIG. 11(C) .
  • the loss rate is equal to 28.9% in the example shown in FIG. 9(C)
  • the loss rate is reduced to 20.0% in the example shown in FIG. 11(C) . Extending the length of the TTI in this manner can improve the loss rate, when the first method of the second embodiment is used.
  • a second method of deriving a set of symbol parameters extends the period of the TTI, and changes the number of symbols in the single TTI while maintaining a constant loss rate.
  • the share of the guard interval and the effective symbol has to be kept constant so as to fulfill the constant loss rate.
  • the first set of symbol parameters as shown in FIG. 11(D) , the periods of the guard interval and the effective symbol are doubled respectively, and accordingly the number of symbols in one TTI can be reduced to 10 symbols.
  • the second set of symbol parameters has the parameter values as follows.
  • the second set of symbol parameters has the parameter values as follows.
  • the constant loss rate can be maintained, and thus it is possible to derive sets of symbol parameters with equal data transmission efficiency.
  • the loss rate increases accordingly.
  • the number of symbols in one TTI is equal to 2.5 symbols in the example shown in FIG. 9(E)
  • the number of symbols is equal to 5 symbols in FIG. 11(E) .
  • extending the length of the TTI allows the number of symbols in the single TTI to be adjusted to be an integer.
  • a third method of deriving a set of symbol parameters is configured as a combination of the first method and the second method while extending the period of the TTI.
  • the first method may be applied to a first set of symbol parameters to derive a second set of symbol parameters
  • the second method may be applied to the second set of symbol parameters to derive a third set of symbol parameters.
  • the loss rate is equal to 15.5% for the second set of symbol parameters.
  • the number of symbols is modified while maintaining the constant loss rate. For example, if the periods of the guard interval and the effective symbol are duplicated respectively, the third set of symbol parameters has the parameter values as follows ( FIG. 11(F) ).
  • subcarrier interval 11.25 kHz
  • period of effective symbol 512 samples (88.8 ⁇ s)
  • guard interval 94.3 samples (16.37 ⁇ s)
  • the third set of symbol parameters derived in this manner includes the same loss rate (15.5%) as the set of symbol parameters shown in FIG. 11(B) , and includes the same subcarrier interval (11.25 kHz) as the set of symbol parameters shown in FIG. 11(D) .
  • the period of the guard interval (94.3 samples) for the third set of symbol parameters is longer than any ones shown in FIGS. 11(B) and 11(D) .
  • the third method it is possible to efficiently derive a set of symbol parameters with a predetermined relationship between the subcarrier interval and the loss rate.
  • the number of symbols included in the single TTI can be adjusted to be an integer.

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Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080031221A1 (en) * 2006-08-07 2008-02-07 Sanjiv Nanda Transmit time segments for asynchronous wireless communication
US20080031172A1 (en) * 2006-08-07 2008-02-07 Sanjiv Nanda Conditional scheduling for asynchronous wireless communication
US20080031224A1 (en) * 2006-08-07 2008-02-07 Sanjiv Nanda Message exchange scheme for asynchronous wireless communication
US20080031223A1 (en) * 2006-08-07 2008-02-07 Sanjiv Nanda Monitor period for asynchronous wireless communication
US20080031222A1 (en) * 2006-08-07 2008-02-07 Sanjiv Nanda Conditional requests for asynchronous wireless communication
US7894818B2 (en) * 2005-06-15 2011-02-22 Samsung Electronics Co., Ltd. Apparatus and method for multiplexing broadcast and unicast traffic in a multi-carrier wireless network
US20110255617A1 (en) * 2007-03-29 2011-10-20 Toshinori Suzuki Radio apparatus
US20120182958A1 (en) * 2009-09-30 2012-07-19 Telefonaktiebolaget Lm Ericsson (Publ) Reconfiguration of Active Component Carrier Set in Multi-Carrier Wireless Systems
WO2014158205A1 (en) * 2013-03-26 2014-10-02 Empire Technology Development, Llc Predictive spectral allocation in mobile networks
US20160095104A1 (en) * 2014-09-26 2016-03-31 Qualcomm Incorporated Ultra-low latency lte reference signal transmission
WO2016064059A1 (en) * 2014-10-21 2016-04-28 Lg Electronics Inc. Method for transmitting and receiving data in wireless communication system and apparatus for the same
WO2016064048A1 (en) * 2014-10-21 2016-04-28 Lg Electronics Inc. Method for monitoring downlink control channel in wireless communication system and apparatus for the same
US20160269150A1 (en) * 2015-03-15 2016-09-15 Qualcomm Incorporated Scalable tti with advanced pilot and control
US9554293B2 (en) 2013-06-11 2017-01-24 Empire Technology Development Llc Smooth transition between predictive and mobile-assisted spectral allocation
US20180035446A1 (en) * 2016-07-28 2018-02-01 Qualcomm Incorporated Transmission of ultra-reliable low-latency communications (urllc) over time division duplex (tdd) using a urllc configuration for a tdd subframe
US9955462B2 (en) 2014-09-26 2018-04-24 Qualcomm Incorporated Ultra-low latency LTE control data communication
US10129058B2 (en) * 2016-09-16 2018-11-13 Nokia Solutions And Networks Oy Demodulation reference signal based automatic gain control
US20180359123A1 (en) * 2015-12-28 2018-12-13 Sony Corporation Apparatus and method
EP3327975A4 (en) * 2015-07-24 2019-03-06 LG Electronics Inc. METHOD FOR RECEIVING DOWNLINK CONTROL INFORMATION AND USER DEVICE, AND METHOD FOR TRANSMITTING DOWNLINK CONTROL INFORMATION AND BASE STATION
CN109863802A (zh) * 2016-10-28 2019-06-07 高通股份有限公司 在低时延无线通信系统中的上行链路传输技术
JP2020500437A (ja) * 2016-09-29 2020-01-09 パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカＰａｎａｓｏｎｉｃ Ｉｎｔｅｌｌｅｃｔｕａｌ Ｐｒｏｐｅｒｔｙ Ｃｏｒｐｏｒａｔｉｏｎ ｏｆ Ａｍｅｒｉｃａ 通信方法、通信装置および通信システム
US10582442B2 (en) * 2015-04-29 2020-03-03 Lg Electronics Inc. Method and apparatus for receiving system information and paging in short TTI in wireless communication system
US10715386B2 (en) 2015-09-16 2020-07-14 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method and apparatus for regulating communication parameters
US10939454B2 (en) * 2014-12-11 2021-03-02 Qualcomm Incorporated Prioritizing colliding transmissions in LTE and ultra-low latency LTE communications

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4463723B2 (ja) * 2005-04-28 2010-05-19 株式会社エヌ・ティ・ティ・ドコモ 送信機及び送信方法
JP2008193414A (ja) 2007-02-05 2008-08-21 Nec Corp 無線通信システム、その上りリンクにおけるデータ送信方法、基地局装置及び移動局装置
WO2008133449A1 (en) 2007-04-27 2008-11-06 Samsung Electronics Co., Ltd. Method and apparatus for transmitting and receiving uplink channel sounding reference signals in a wireless communication system
JP4940115B2 (ja) * 2007-07-13 2012-05-30 株式会社日立製作所 無線通信システム、無線端末および無線基地局
WO2009125708A1 (ja) * 2008-04-08 2009-10-15 日本電気株式会社 無線通信システム、無線通信装置、無線通信方法、プログラム
CN101572905B (zh) * 2008-04-30 2014-06-04 华为技术有限公司 传输时间间隔的调整方法和装置
JP5658658B2 (ja) * 2008-04-30 2015-01-28 コーニンクレッカ フィリップス エヌ ヴェ 無線局にリソースを通知するための方法及びそのための無線局
KR101507850B1 (ko) 2008-05-29 2015-04-07 엘지전자 주식회사 이동 통신 시스템에서 제어 정보를 상향 전송하는 방법
US8494065B2 (en) * 2008-06-09 2013-07-23 Qualcomm Incorporated Interference reduction between OFDM carriers by frequency offset optimization
CN101932101B (zh) * 2009-06-19 2015-03-11 华为技术有限公司 传输时间间隔的调整方法和网络设备
JP4733200B2 (ja) * 2009-08-20 2011-07-27 株式会社エヌ・ティ・ティ・ドコモ 受信装置
CN102065046B (zh) * 2009-11-11 2013-10-09 北京泰美世纪科技有限公司 一种ofdm系统的信息传输方法及信号生成装置
GB2495473A (en) * 2011-10-03 2013-04-17 Renesas Mobile Corp Modifying transmission time interval (tti) allocation using high speed shared control channel (hs-scch) order
ITTO20120242A1 (it) * 2012-03-19 2013-09-20 Rai Radiotelevisione Italiana Metodo per generare un segnale di tipo vcm o acm a trama perfezionata
EP2907284A1 (en) * 2012-10-15 2015-08-19 Nokia Solutions and Networks Oy Flexible frame structure
EP3136644A4 (en) * 2014-05-15 2017-05-10 Huawei Technologies Co., Ltd. Data transmission apparatuses and methods
US9832059B2 (en) 2014-06-02 2017-11-28 Marvell World Trade Ltd. High efficiency orthogonal frequency division multiplexing (OFDM) physical layer (PHY)
JP6662371B2 (ja) * 2015-03-06 2020-03-11 日本電気株式会社 無線局、無線端末装置、及びこれらの方法
JP6658729B2 (ja) 2015-03-06 2020-03-04 日本電気株式会社 無線局、無線端末装置、及びこれらの方法
EP3270526B1 (en) 2015-03-12 2020-08-12 LG Electronics Inc. Method for reducing transmission resource of control channel in short tti, and device using same
US10383105B2 (en) 2015-07-12 2019-08-13 Lg Electronics Inc. Method and device for transmitting control information in wireless communication system
WO2017014074A1 (ja) * 2015-07-17 2017-01-26 株式会社Ｎｔｔドコモ ユーザ端末、無線基地局及び無線通信方法
US10440662B2 (en) 2015-08-13 2019-10-08 Lg Electronics Inc. Method and apparatus for controlling power in wireless communication system
WO2017070962A1 (zh) 2015-10-31 2017-05-04 广东欧珀移动通信有限公司 指示资源的方法、基站和终端
WO2017088182A1 (zh) * 2015-11-27 2017-06-01 华为技术有限公司 一种信道调整方法、对应装置及系统

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030147358A1 (en) * 2001-05-16 2003-08-07 Katsuhiko Hiramatsu Radio base station apparatus and communication terminal
US20040042492A1 (en) * 2001-08-22 2004-03-04 Hidetoshi Suzuki ARQ transmission and reception methods and apparatus
US6721569B1 (en) * 2000-09-29 2004-04-13 Nortel Networks Limited Dynamic sub-carrier assignment in OFDM systems
US20050152466A1 (en) * 2004-01-12 2005-07-14 Maltsev Alexander A. Multicarrier communication system and methods for link adaptation using uniform bit loading and subcarrier puncturing
US20050201337A1 (en) * 2003-02-14 2005-09-15 Samsung Electronic Co., Ltd. System and method for retransmitting uplink data in a code division multiple access communication system
US20050249120A1 (en) * 2004-05-04 2005-11-10 Samsung Electronics Co., Ltd. Method and apparatus for changing TTI based on a HARQ process in an enhanced uplink dedicated channel
US7023933B2 (en) * 2000-10-20 2006-04-04 Matsushita Electric Industrial Co., Ltd. Radio communication apparatus
US20080077837A1 (en) * 2004-04-01 2008-03-27 Matsushita Electric Industrial Co.,Ltd. Interference Limitation for Retransmissions

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4425713C1 (de) * 1994-07-20 1995-04-20 Inst Rundfunktechnik Gmbh Verfahren zur Vielträger Modulation und Demodulation von digital codierten Daten
JP2852295B2 (ja) * 1997-05-26 1999-01-27 株式会社次世代デジタルテレビジョン放送システム研究所 Ｏｆｄｍ信号復調装置
UA30803A (uk) * 1998-06-04 2000-12-15 Державне Підприємство "Кб Оризон-Навігація" Спосіб і пристрій широкосмугового багатоканального адресного дуплексного радіозв'язку
JP3421671B2 (ja) * 1999-09-30 2003-06-30 独立行政法人通信総合研究所 通信システム、選択装置、送信装置、受信装置、選択方法、送信方法、受信方法、および、情報記録媒体
JP3581072B2 (ja) * 2000-01-24 2004-10-27 株式会社エヌ・ティ・ティ・ドコモ チャネル構成方法及びその方法を利用する基地局
JP3746048B2 (ja) * 2000-11-06 2006-02-15 松下電器産業株式会社 無線通信装置
US20040081131A1 (en) * 2002-10-25 2004-04-29 Walton Jay Rod OFDM communication system with multiple OFDM symbol sizes
JP2004214961A (ja) * 2002-12-27 2004-07-29 Sony Corp Ｏｆｄｍ復調装置
KR100510861B1 (ko) * 2003-01-18 2005-08-31 디지피아(주) 직교 주파수 분할 다중 전송 시스템에서의 훈련 신호 결정방법 및 그 훈련 신호를 이용한 직교 주파수 분할 다중수신기와 수신 방법
US7203245B1 (en) * 2003-03-31 2007-04-10 3Com Corporation Symbol boundary detector method and device for OFDM systems
EP1489773A1 (en) * 2003-06-16 2004-12-22 Mitsubishi Electric Information Technology Centre Europe B.V. Time scheduling with stop-and-wait ARQ process
KR101009861B1 (ko) * 2003-08-19 2011-01-19 삼성전자주식회사 이동통신 시스템에서의 데이터 전송 방법과 전송률 할당 방법 및 이를 위한 장치
JP2005117579A (ja) * 2003-10-10 2005-04-28 Fujitsu Ltd 無線送信装置，無線受信装置，移動通信システムおよび無線リソース制御方法
JP4291674B2 (ja) * 2003-11-11 2009-07-08 株式会社エヌ・ティ・ティ・ドコモ Ｏｆｄｍ送信機及びｏｆｄｍ受信機
US8031583B2 (en) * 2005-03-30 2011-10-04 Motorola Mobility, Inc. Method and apparatus for reducing round trip latency and overhead within a communication system
JP4463723B2 (ja) * 2005-04-28 2010-05-19 株式会社エヌ・ティ・ティ・ドコモ 送信機及び送信方法
US8743843B2 (en) * 2006-01-11 2014-06-03 Qualcomm Incorporated Methods and apparatus relating to timing and/or synchronization including the use of wireless terminals beacon signals

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6721569B1 (en) * 2000-09-29 2004-04-13 Nortel Networks Limited Dynamic sub-carrier assignment in OFDM systems
US7023933B2 (en) * 2000-10-20 2006-04-04 Matsushita Electric Industrial Co., Ltd. Radio communication apparatus
US7738590B2 (en) * 2000-10-20 2010-06-15 Panasonic Corporation Radio communication apparatus capable of switching modulation schemes
US20030147358A1 (en) * 2001-05-16 2003-08-07 Katsuhiko Hiramatsu Radio base station apparatus and communication terminal
US20040042492A1 (en) * 2001-08-22 2004-03-04 Hidetoshi Suzuki ARQ transmission and reception methods and apparatus
US20050201337A1 (en) * 2003-02-14 2005-09-15 Samsung Electronic Co., Ltd. System and method for retransmitting uplink data in a code division multiple access communication system
US7269420B2 (en) * 2003-02-14 2007-09-11 Samsung Electronics Co., Ltd. System and method for retransmitting uplink data in a code division multiple access communication system
US20050152466A1 (en) * 2004-01-12 2005-07-14 Maltsev Alexander A. Multicarrier communication system and methods for link adaptation using uniform bit loading and subcarrier puncturing
US20080077837A1 (en) * 2004-04-01 2008-03-27 Matsushita Electric Industrial Co.,Ltd. Interference Limitation for Retransmissions
US20050249120A1 (en) * 2004-05-04 2005-11-10 Samsung Electronics Co., Ltd. Method and apparatus for changing TTI based on a HARQ process in an enhanced uplink dedicated channel

Cited By (64)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7894818B2 (en) * 2005-06-15 2011-02-22 Samsung Electronics Co., Ltd. Apparatus and method for multiplexing broadcast and unicast traffic in a multi-carrier wireless network
US20080031221A1 (en) * 2006-08-07 2008-02-07 Sanjiv Nanda Transmit time segments for asynchronous wireless communication
US9008002B2 (en) * 2006-08-07 2015-04-14 Qualcomm Incorporated Conditional requests for asynchronous wireless communication
US20080031223A1 (en) * 2006-08-07 2008-02-07 Sanjiv Nanda Monitor period for asynchronous wireless communication
US20080031222A1 (en) * 2006-08-07 2008-02-07 Sanjiv Nanda Conditional requests for asynchronous wireless communication
US20080031172A1 (en) * 2006-08-07 2008-02-07 Sanjiv Nanda Conditional scheduling for asynchronous wireless communication
US9661649B2 (en) 2006-08-07 2017-05-23 Qualcomm Incorporated Determining a transmit parameter for wireless communication
US8310996B2 (en) * 2006-08-07 2012-11-13 Qualcomm Incorporated Conditional scheduling for asynchronous wireless communication
US8340027B2 (en) * 2006-08-07 2012-12-25 Qualcomm Incorporated Monitor period for asynchronous wireless communication
US8416762B2 (en) 2006-08-07 2013-04-09 Qualcomm Incorporated Message exchange scheme for asynchronous wireless communication
US8737313B2 (en) * 2006-08-07 2014-05-27 Qualcomm Incorporated Transmit time segments for asynchronous wireless communication
US20080031224A1 (en) * 2006-08-07 2008-02-07 Sanjiv Nanda Message exchange scheme for asynchronous wireless communication
US20110255617A1 (en) * 2007-03-29 2011-10-20 Toshinori Suzuki Radio apparatus
US20120182958A1 (en) * 2009-09-30 2012-07-19 Telefonaktiebolaget Lm Ericsson (Publ) Reconfiguration of Active Component Carrier Set in Multi-Carrier Wireless Systems
US11102040B2 (en) 2009-09-30 2021-08-24 Optis Wireless Technology, Llc Reconfiguration of active component carrier set in multi-carrier wireless systems related application
US10411927B2 (en) 2009-09-30 2019-09-10 Optis Wireless Technology, Llc Reconfiguration of active component carrier set in multi-carrier wireless systems
US9853848B2 (en) 2009-09-30 2017-12-26 Optis Wireless Technology, Llc Reconfiguration of active component carrier set in multi-carrier wireless systems
US9462484B2 (en) * 2009-09-30 2016-10-04 Optis Wireless Technology, Llc Reconfiguration of active component carrier set in multi-carrier wireless systems
US9204448B2 (en) 2013-03-26 2015-12-01 Empire Technology Department Llc Predictive spectral allocation in mobile networks
WO2014158205A1 (en) * 2013-03-26 2014-10-02 Empire Technology Development, Llc Predictive spectral allocation in mobile networks
US9572165B2 (en) 2013-03-26 2017-02-14 Empire Technology Development Llc Predictive spectral allocation in mobile networks
US9554293B2 (en) 2013-06-11 2017-01-24 Empire Technology Development Llc Smooth transition between predictive and mobile-assisted spectral allocation
EP4213422A1 (en) * 2014-09-26 2023-07-19 QUALCOMM Incorporated Ultra-low latency lte referencesignal transmission
US11985084B2 (en) 2014-09-26 2024-05-14 Qualcomm Incorporated Ultra-low latency LTE reference signal transmission
US11234226B2 (en) 2014-09-26 2022-01-25 Qualcomm Incorporated Ultra-low latency LTE control data communication
US20160095104A1 (en) * 2014-09-26 2016-03-31 Qualcomm Incorporated Ultra-low latency lte reference signal transmission
US9955462B2 (en) 2014-09-26 2018-04-24 Qualcomm Incorporated Ultra-low latency LTE control data communication
US9980257B2 (en) * 2014-09-26 2018-05-22 Qualcomm Incorporated Ultra-low latency LTE reference signal transmission
US11088798B2 (en) 2014-09-26 2021-08-10 Qualcomm Incorporated Ultra-low latency LTE reference signal transmission
EP3748885A1 (en) * 2014-09-26 2020-12-09 QUALCOMM Incorporated Ultra-low latency lte reference signal transmission
US10750481B2 (en) 2014-09-26 2020-08-18 Qualcomm Incorporated Ultra-low latency LTE control data communication
CN111262650A (zh) * 2014-09-26 2020-06-09 高通股份有限公司 超低等待时间lte参考信号发射
US10660074B2 (en) 2014-09-26 2020-05-19 Qualcomm Incorporated Ultra-low latency LTE reference signal transmission
AU2018271356B2 (en) * 2014-09-26 2020-03-05 Qualcomm Incorporated Ultra-low latency lte reference signal transmission
WO2016064059A1 (en) * 2014-10-21 2016-04-28 Lg Electronics Inc. Method for transmitting and receiving data in wireless communication system and apparatus for the same
US11716188B2 (en) 2014-10-21 2023-08-01 Lg Electronics Inc. Method for transmitting and receiving data in wireless communication system and apparatus for the same
WO2016064048A1 (en) * 2014-10-21 2016-04-28 Lg Electronics Inc. Method for monitoring downlink control channel in wireless communication system and apparatus for the same
US10455503B2 (en) 2014-10-21 2019-10-22 Lg Electronics Inc. Method for monitoring downlink control channel in wireless communication system and apparatus for the same
US11171761B2 (en) 2014-10-21 2021-11-09 Lg Electronics Inc. Method for transmitting and receiving data in wireless communication system and apparatus for the same
US10560245B2 (en) * 2014-10-21 2020-02-11 Lg Electronics Inc. Data transmission/reception method in wireless communication system that supports low latency, and apparatus therefor
WO2016064049A1 (en) * 2014-10-21 2016-04-28 Lg Electronics Inc. Method for transmitting and receiving data in wireless communication system and apparatus for the same
US10411869B2 (en) 2014-10-21 2019-09-10 Lg Electronics Inc. Method for transmitting and receiving data in wireless communication system and apparatus for the same
US10361836B2 (en) 2014-10-21 2019-07-23 Lg Electronics Inc. Method for transmitting and receiving data in wireless communication system and apparatus for the same
US10939454B2 (en) * 2014-12-11 2021-03-02 Qualcomm Incorporated Prioritizing colliding transmissions in LTE and ultra-low latency LTE communications
US10547415B2 (en) * 2015-03-15 2020-01-28 Qualcomm Incorporated Scalable TTI with advanced pilot and control
TWI701914B (zh) * 2015-03-15 2020-08-11 美商高通公司 具有高級引導頻和控制的可縮放tti
US20160269150A1 (en) * 2015-03-15 2016-09-15 Qualcomm Incorporated Scalable tti with advanced pilot and control
US10582442B2 (en) * 2015-04-29 2020-03-03 Lg Electronics Inc. Method and apparatus for receiving system information and paging in short TTI in wireless communication system
EP3327975A4 (en) * 2015-07-24 2019-03-06 LG Electronics Inc. METHOD FOR RECEIVING DOWNLINK CONTROL INFORMATION AND USER DEVICE, AND METHOD FOR TRANSMITTING DOWNLINK CONTROL INFORMATION AND BASE STATION
US11057914B2 (en) 2015-07-24 2021-07-06 Lg Electronics Inc. Downlink control information receiving method and user equipment, and downlink control information transmission method and base station
US10715386B2 (en) 2015-09-16 2020-07-14 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method and apparatus for regulating communication parameters
US11394613B2 (en) 2015-09-16 2022-07-19 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method and apparatus for regulating communication parameters
US11863387B2 (en) 2015-09-16 2024-01-02 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method and apparatus for regulating communication parameters
US10374855B2 (en) * 2015-12-28 2019-08-06 Sony Corporation Apparatus and method
TWI717440B (zh) * 2015-12-28 2021-02-01 日商新力股份有限公司 通訊裝置及通訊方法
US20180359123A1 (en) * 2015-12-28 2018-12-13 Sony Corporation Apparatus and method
US20180035446A1 (en) * 2016-07-28 2018-02-01 Qualcomm Incorporated Transmission of ultra-reliable low-latency communications (urllc) over time division duplex (tdd) using a urllc configuration for a tdd subframe
US11089611B2 (en) 2016-07-28 2021-08-10 Qualcomm Incorporated Transmission of ultra-reliable low-latency communications (URLLC) over time division duplex (TDD) using a URLLC configuration for a TDD subframe
US10440729B2 (en) * 2016-07-28 2019-10-08 Qualcomm Incorporated Transmission of Ultra-Reliable Low-Latency Communications (URLLC) over Time Division Duplex (TDD) using a URLLC configuration for a TDD subframe
US10129058B2 (en) * 2016-09-16 2018-11-13 Nokia Solutions And Networks Oy Demodulation reference signal based automatic gain control
JP2020500437A (ja) * 2016-09-29 2020-01-09 パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカＰａｎａｓｏｎｉｃ Ｉｎｔｅｌｌｅｃｔｕａｌ Ｐｒｏｐｅｒｔｙ Ｃｏｒｐｏｒａｔｉｏｎ ｏｆ Ａｍｅｒｉｃａ 通信方法、通信装置および通信システム
US12149391B2 (en) 2016-09-29 2024-11-19 Panasonic Intellectual Property Corporation Of America Communication method, communication apparatus and communication system configured to determine whether a reserved period is between two data or signals
CN109863802A (zh) * 2016-10-28 2019-06-07 高通股份有限公司 在低时延无线通信系统中的上行链路传输技术
US12022402B2 (en) 2016-10-28 2024-06-25 Qualcomm Incorporated Uplink transmission techniques in low latency wireless communication systems

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CN103152306A (zh) 2013-06-12
RU2008100083A (ru) 2009-07-20
EP2696550A1 (en) 2014-02-12
TWI312629B (enExample) 2009-07-21
CN101223721A (zh) 2008-07-16
BRPI0612294A2 (pt) 2010-11-03
KR101242592B1 (ko) 2013-03-19
RU2430475C2 (ru) 2011-09-27
EP1892866A4 (en) 2013-09-04
WO2006134830A1 (ja) 2006-12-21
EP1892866A1 (en) 2008-02-27
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CN103152306B (zh) 2016-06-29
JP4732808B2 (ja) 2011-07-27

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