[go: up one dir, main page]

WO2017168036A1 - Intervalles de temps de transmission de différentes longueurs - Google Patents

Intervalles de temps de transmission de différentes longueurs Download PDF

Info

Publication number
WO2017168036A1
WO2017168036A1 PCT/FI2016/050199 FI2016050199W WO2017168036A1 WO 2017168036 A1 WO2017168036 A1 WO 2017168036A1 FI 2016050199 W FI2016050199 W FI 2016050199W WO 2017168036 A1 WO2017168036 A1 WO 2017168036A1
Authority
WO
WIPO (PCT)
Prior art keywords
feedback information
piece
terminal device
time interval
transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/FI2016/050199
Other languages
English (en)
Inventor
Timo Lunttila
Esa Tiirola
Kari Hooli
Juha Korhonen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Technologies Oy
Original Assignee
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Technologies Oy filed Critical Nokia Technologies Oy
Priority to PCT/FI2016/050199 priority Critical patent/WO2017168036A1/fr
Priority to EP16896661.2A priority patent/EP3437404A4/fr
Publication of WO2017168036A1 publication Critical patent/WO2017168036A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • 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

Definitions

  • the invention relates to wireless communications in a cellular communica- tion system.
  • Network throughput may be increased by using a short transmission time interval to de- crease latency.
  • a longer transmission time interval provides better coverage for uplink transmissions.
  • Figure 1 illustrates an exemplified wireless communication system
  • FIG. 7 to 17 illustrate different resource reservation examples
  • Figure 18 illustrates exemplified information exchange
  • Figure 19 is a schematic block diagram.
  • Embodiments and examples described herein may be implemented in a wireless system, such as in at least one of the following: Universal Mobile Telecommunication System (UMTS, 3G) based on basic wideband-code division multiple access (W-CDMA), high-speed packet access (HSPA), Long Term Evolution (LTE), LTE-Advanced, LTE-Ad- vanced Pro, 5G system, beyond 5G, and/or wireless local area networks (WLAN), such as Wi-Fi.
  • UMTS Universal Mobile Telecommunication System
  • 3G Universal Mobile Telecommunication System
  • W-CDMA high-speed packet access
  • LTE Long Term Evolution
  • LTE-Advanced Long Term Evolution-Advanced
  • LTE-Ad- vanced Pro LTE-Advanced
  • 5G system beyond 5G
  • WLAN wireless local area networks
  • 5G is likely to use multiple-input-multiple-output (MIMO) multi-antenna transmission techniques, many more base stations or access nodes than the current network deployments of LTE (a so-called small cell concept), including macro sites operating in co-operation with smaller local area access nodes, such as local ultra-dense deployment of small cells, and perhaps also employing a variety of radio technologies for better coverage and enhanced data rates.
  • MIMO multiple-input-multiple-output
  • 5G will likely be comprised of more than one radio access technology (RAT), each optimized for certain use cases and/or spectrum.
  • 5G mobile communications will have a wider range of use cases and related applications including video streaming, augmented reality, different ways of data sharing and various forms of machine type applications, including vehicular safety, different sensors and real-time control.
  • RAT radio access technology
  • 5G is expected to have multiple radio interfaces, namely interfaces for frequency ranges below 6GHz, cm Wave frequency ranges ranging from 3GHz to 30GHz, mmWave frequency ranges ranging from 30GHz to 100GHz, and/or for even higher frequencies, and also being integrated and/or interoperate with existing legacy radio access technologies, such as the LTE. Integration with the LTE may be implemented, at least in the early phase, as a system, where macro coverage is provided by the LTE and 5G radio interface access comes from small cells by aggregation to the LTE.
  • 5G is planned to support both inter-RAT operability (such as LTE-5G) and inter-RI operability (inter-radio interface operability, such as below 6GHz - cmWave, below 6GHz - cmWave - mmWave).
  • inter-RAT operability such as LTE-5G
  • inter-RI operability inter-radio interface operability, such as below 6GHz - cmWave, below 6GHz - cmWave - mmWave.
  • network slicing in which multiple independent and dedicated virtual sub-networks (network instances) may be created within the same infrastructure to run services that have different requirements on latency, reliability, throughput and mobility.
  • NFV network functions virtualization
  • a virtualized network function may comprise one or more virtual machines running computer program codes using standard or general type servers instead of customized hardware. Cloud computing or cloud data storage may also be utilized.
  • radio communications this may mean node operations to be carried out, at least partly, in a server, host or node opera- tionally coupled to a remote radio head. It is also possible that node operations will be distributed among a plurality of servers, nodes or hosts.
  • Figure 1 An extremely general architecture of an exemplifying system 100 to which embodiments of the invention may be applied is illustrated in Figure 1.
  • Figure 1 is a simplified system architecture only showing some elements and functional entities, all being logical units whose implementation may differ from what is shown. It is apparent to a person skilled in the art that the system may comprise any number of the illustrated ele- ments and functional entities.
  • a cellular communication system 100 formed by one or more cellular radio communication networks, such as the Long Term Evolution (LTE), the LTE-Advanced (LTE-A) of the 3rd Generation Partnership Project (3GPP), or the predicted future 5G solutions, are typically composed of one or more network nodes that may be of different type.
  • An example of such network nodes is a base station 110, such as an evolved NodeB (eNB), providing a wide area, medium range or local area coverage 101 for terminal devices 120, for example for the terminal devices to obtain wireless access to other networks 130 such as the Internet, either directly or via a core network (not illustrated in Figure 1).
  • eNB evolved NodeB
  • a base station 110 may be any network node (device, apparatus) capable of providing coverage and controlling radio communication within its own cell, including configuring a terminal device 120 with one or more transmission time intervals (TTI).
  • TTI configuration such as one or more values for downlink TTI and/or for uplink TTI, may be a semi-static configuration which is valid at least for a longer period of time, or a transmission-specific configuration, i.e. carried out for each transmission.
  • the terminal device (TD) 120 refers to a portable computing device (equipment, apparatus), and it may also be referred to as a user device, a user terminal or a mobile terminal or a machine-type-communication (MTC) device, also called Machine- to-Machine device and peer-to-peer device.
  • MTC machine-type-communication
  • Such computing devices in- elude wireless mobile communication devices operating with or without a subscriber identification module (SIM) in hardware or in soft-ware, including, but not limited to, the following types of devices: mobile phone, smart-phone, personal digital assistant (PDA), handset, laptop and/or touch screen computer, e-reading device, tablet, game console, notebook, multimedia device, sensor, actuator, video camera, car, refrigerator, other do- mestic appliances, telemetry appliances, and telemonitoring appliances.
  • the terminal device 120 is configured to apply a virtual TTI concept to feedback information, such as channel state information and/or hybrid automatic repeat request (HARQ) acknowledgements and negative acknowledgements.
  • HARQ hybrid automatic repeat request
  • the terminal device 120 comprises a feedback transmitting unit (f-t-u) 121 configured to use TTI configuration information (TTI config.) 122 stored at least temporarily to the terminal device. Examples of different functionalities of the feedback transmitting unit will be described in more detail below as part of the terminal device functionality.
  • the TTI configuration may comprise zero or more first TTI lengths for downlink and one or more second TTI lengths usable for uplink and downlink.
  • the TTI configuration may be chan- nel-specific, channel type -specific or general. When one or more first TTI lengths and one or more second TTI lengths are configured to be used on a same channel, the first TTI lengths are shorter in time than the second TTI lengths.
  • a first TTI length may be called a short TTI, a shortened length TTI, shortened TTI, or sTTI.
  • the second TTI length may be called a normal TTI, normal length TTI, nTTI, longer TTI, long TTI, or TTI.
  • the second TTI may be a legacy TTI, and/or a default TTI.
  • the legacy TTI means a long TTI value used in LTE releases 13 or older.
  • the long TTI length is 1 ms in LTE releases 8-13.
  • the default TTI means a TTI value used in case of no other TTI value is configured.
  • the first TTI values may be 0.1 ms, 0.2 ms, or 0.5 ms, for example.
  • the TTI value may be also expressed by number of symbols it comprises.
  • the normal TTI (the second TTI) may comprise 14 symbols and the short TTI (the first TTI) may comprise 1 symbol, 2 symbols or 7 symbols or the short TTI may be an alternating TTI, for example alternating with 3 and 4 symbols.
  • the value of the first TTI in one channel may be the value of the second TTI in another channel.
  • physical shared channels may be configured with a first TTI with 7 symbols and a second TTI with 14 symbols
  • physical control channels may be configured with a second TTI with 7 symbols.
  • Figure 2 is a flow chart illustrating an exemplified basic functionality of a terminal device.
  • the functionality may be performed by the feedback transmitting unit in the terminal device, or the terminal device may comprise a configuration unit for the functionality.
  • the TTI configuration is updated in block 202 to correspond the received con- figuration and the received configuration is used (block 202).
  • the configuration may be received over a unicast or multicast or broadcast control signaling from a base station serving the terminal device.
  • the configuration may be sent using a physical downlink control channel, and/or a physical downlink shared channel. For example, the configuration may be sent with radio resource control signaling.
  • the process described in Figure 2 is a background process. If the configuration is a semi-static configuration, i.e. valid for an unlimited time until next configuration is received, a new configuration may be received in an interval of one or multiple radio frames, for example in an interval of 10 milliseconds, or the new configuration may be received more randomly, with longer and/or changing time periods between two config- urations .
  • the configuration may be a dynamic one, for example received for each transmission.
  • the configuration may be terminal device -specific configuration, a cell -specific configuration, or a system -wide configuration, or a configuration according to standard definitions. Further, the configuration may, instead of having one or more val- ues, mere indicate that a short TTI is used for downlink in addition to the normal TTI used for uplink and downlink, or that only the short TTI or the only the normal TTI is used for uplink and downlink, the value(s) already being known by the terminal device. At the simplest the received TTI configuration may indicate whether or not the short TTI (first TTI) is used in downlink.
  • FIG. 3 is a flow chart illustrating an exemplified basic functionality of a terminal device, or more precisely, the feedback transmitting unit in the terminal device, configured to use at least two different lengths of TTI.
  • the TTI configuration comprises a short TTI (sTTI) for downlink (DL) and a normal length TTI (nTTI) for uplink (UL) as a semi-static configuration, the short TTI being shorter in time than the normal TTI.
  • TX downlink transmission
  • at least one time resource for transmission of feedback information on an uplink channel is determined in block 302 based on the short TTI.
  • the determined at least one time resource is coincident with an uplink channel transmission (TX) configured to at least one normal TTI (block 303), determining in block 304 the at least one time resource to be on the uplink channel in at least one piece of the at least one normal TTI, wherein the duration of the at least one piece is the same as, or longer than, the duration of the at least one short TTI, the upper limit for the duration of the at least one piece being half of the at least one normal TTI. Then the transmission is caused (carried out) in block 305 according to the determination, i.e. according to the resource determined in block 304.
  • TX uplink channel transmission
  • block 304 determines the at least one time resource to be on the uplink channel in at least one piece of the at least one normal TTI, wherein the duration of the at least one piece is the same as, or longer than, the duration of the at least one short TTI, the upper limit for the duration of the at least one piece being half of the at least one normal TTI.
  • the upper limit of half of the at least one normal TTI has, in view of latency, the advantage that a significant difference between the shorter TTI and the normal TTI is achieved. Further, the upper limit of half of the at least one normal TTI fulfil the criterion for a short TTI length, i.e. a short TTI should fit within a subframe.
  • the trans- mission is caused (carried out) in block 305 according to the determination, i.e. according to the resource determined in block 302.
  • the feedback information may be HARQ A/N (acknowledgement/negative acknowledgement) for the received downlink transmission.
  • the downlink channel may be a physical downlink shared channel, over which the terminal device may also receive unicast transmissions. Further, the terminal device may be scheduled to receive with the short TTI and the normal TTI in different subframes of the physical downlink shared channel; the herein disclosed resource reservations for feedback information enables simultaneous transmission of feedback information for both short TTI and normal TTI.
  • the uplink channel may be a physical uplink shared channel, or a physical uplink control channel.
  • the uplink channel may be a physical uplink control channel having a short TTI.
  • the determined at least one time resource is a kind of a virtual TTI, and the term virtual TTI is used below.
  • FIG. 4 is a flow chart illustrating an exemplified functionality of a terminal device, or more precisely, the feedback transmitting unit in the terminal device, in an exemplified implementation in which a short TTI (sTTI) is used for downlink, the short TTI being shorter than a normal TTI (nTTI) used for uplink, and in which the virtual TTI has the same duration as the corresponding short TTI, i.e. the TTI used for transmitting the downlink transport blocks whose feedback will be transmitted in the virtual TTI.
  • the virtual TTI reflects downlink short TTI length and timing inside an uplink channel transmission of the normal TTI length, such as legacy TTI on physical uplink shared channel.
  • the normal TTI or at least its length, is configured so that the uplink TTI configuration may be interpreted as a static configuration, whereas the downlink TTI configuration is configured more dynamically without restricting the example to such a solution.
  • the number (A) of short TTIs fitting within a subframe is determined in block 402. For example, if the short TTI is 2 symbols, the number A is 7, and if the short TTI is 7 symbols, the number A is 2. Then the uplink channel allocation having the normal TTI is subdivided in block 403 into A virtual TTIs. In other words, the normal duration uplink channel allocation is subdivided into as many virtual TTIs (time resources) as there are short TTIs in the downlink within a subframe.
  • a downlink transmission such as a transport block (TB) is received in block 404 in a short TTI n
  • its feedback timing is determined in block 405 to be in a virtual TTI n+k
  • the k being a delaying kind of a parameter, such as an index used in HARQ timing.
  • the value of k may be defined separately for different TTI lengths, or a common (fixed) value may be used.
  • the terminal device would have three normal TTIs, i.e. the same amount.
  • TTIs are short TTIs, the absolute time is shorter. Thanks to the increased processing power of terminal devices this is not a problem. Further, data packets transmitted using the short TTIs are most probably smaller than data packets transmitted using the normal TTIs.
  • the determination performed in block 405 can be used as such for short TTI uplink.
  • the feedback timing can be determined in the same way regardless of whether the feedback should be transmitted on a short TTI uplink channel, like the physical uplink control channel, or on a normal TTI uplink channel, like the physical uplink shared channel.
  • the location for the feedback information on the transmission (TB) is determined in block 407.
  • the location may be in the first symbol of the virtual TTI, or in the last symbol of the virtual TTI that is not occupied by one or more reference signals, or distributed in multiple symbols.
  • mapping of the feedback information for the discrete Fourier transform (DFT) spreading is performed in block 410.
  • the mapping is performed so that overlapping with uplink control information of normal TTI is avoided as much as possible.
  • the mapping may be performed from bottom upwards, i.e. first to resources at the end of the symbol, or from top down- wards.
  • the symbol whereto the feedback information is to be mapped, for example a certain single carrier frequency division multiple access (SC-FDMA) symbol, runs out of space, i.e. the feedback information does not fit into the symbol (block 411), a symbol next available within the virtual TTI can be taken (block 412) in use. In other words, the space for the feedback information may continue in the next available symbol.
  • SC-FDMA single carrier frequency division multiple access
  • the resource reservation is per- formed after at least one downlink transmission in the short TTI is received.
  • the resource allocation may be performed in response to receiving TTI configuration, or the resource allocation may be preconfigured to the terminal device.
  • the resource allocation may be part of system definitions.
  • Figures 5 and 6 illustrates different alternatives for how to handle the resource reservation for feedback information on downlink transmission received in one or more short TTIs when the resources have been reserved beforehand.
  • the reserved resources for the feedback information on downlink transmissions are used to send (block 502) the feedback information if a downlink transmission is received in a short TTI (block 501).
  • the data and/or CQI on uplink channel is punctured only if feedback information for downlink transmission in a short TTI is needed.
  • the reserved resources are not used but all resources are used for data and uplink control information (UCI) in the uplink channel.
  • UCI uplink control information
  • the resources for short TTI feedback information on uplink channel are reserved regardless of whether or not the short TTI feedback information, i.e. feedback information for downlink transmission in a short TTI, is needed. If a downlink transmission is received in a short TTI (block 601), the reserved resources for the feedback information on downlink transmissions are used to send (block 602) the feedback information. If a downlink transmission is not received in a short TTI (block 601), the feedback information is set in block 603 to be a negative acknowledgement (NACK), for example, and then NACK is sent. In other words, if no feedback information is needed, the resources reserved for feedback information are used to transmit dummy feedback information in a form of negative feedback information.
  • NACK negative acknowledgement
  • Figures 7 to 14 illustrate different resource reservation examples for short TTI feedback information transmitted simultaneously with normal TTI uplink transmission (UL data) and control information
  • Figure 17 illustrate a resource reservation examples without short TTI transmission feedback
  • the short TTI feedback infor- mation means herein feedback information for downlink transmission in a short TTI.
  • the normal TTI control information comprises channel quality indication (CQI), reference signal (RS), rank indicator (RI), and HARQ acknowledgement/negative acknowledgement (HARQ A/N)
  • the short TTI feedback information comprises HARQ acknowledgement/negative acknowledgement for short TTI transmission (sHARQ A/N).
  • Figures 7 and 8 illustrate resource reservation examples for 2 -symbol virtual TTI, Figures 9 to 13 for 7-symbol virtual TTI, and Figure 14 for alternating virtual TTIs.
  • Figure 7 illustrates a situation in which the one or more time resources for sHARQ A/N are taken from a first SC-FDMA symbol of the virtual TTI resulting to even indexed SC- FDMA symbols of the uplink subframe being used.
  • the resource reservation in Figure 8 differs from the one illustrated in Figure 7, that in Figure 8 CQI symbols are punctured.
  • Figure 9 illustrates resource reservation using the same principles as used in Figure 7, but the resource reservation is for 7-symbol virtual TTI. This alternative, i.e. using the first symbol, minimizes the delay of the sHARQ A/N (i.e. the feedback information), leaving more processing time to the base station.
  • sHARQ A/N i.e. the feedback information
  • Figure 10 illustrates resource reservation in which the one or more time resources for sHARQ A/N are taken from the last symbol of the 7-symbol virtual TTI.
  • An option in which the "last free” symbol is taken will give the terminal device the most time to process the downlink data transmission.
  • the "last free” symbol means herein a symbol that is not occupied by one or more reference signals.
  • Figure 11 illustrates resource reservation in which the one or more time resources for sHARQ A/N are taken by spreading them to the first and to the last virtual symbol. This option provides larger space for sHARQ A/N but in turn requires more stringent processing from the terminal device compared to the solution in Figure 10 and from the base station compared to the solution in Figure 9.
  • Figure 12 illustrates resource reservation in which the one or more time resources for sHARQ A/N are in symbols next to the reference symbols for improved performance of channel estimation.
  • Figure 14 illustrates resource reservation when downlink short TTI has an alternating length, alternating in the illustrated example between 4 and 3 symbols, and the virtual TTI is determined to be of the same length, and as a reason, virtual TTI alternates between 4-symbol and 3-symbol virtual TTI.
  • the "first free" symbol in the virtual TTI is taken in use.
  • the "first free” means herein a symbol that is not occupied by DMRS.
  • an alternative normal TTI uplink subframe structure for DMRS may be defined in which structure uplink DMRSs are located in a first SC-FDMA symbol of each slot.
  • Such a subframe structure may be defined for normal TTI uplink transmissions only, or to be used also to carry feedback information on short TTI downlink transmissions on top of the normal TTI uplink transmis- sions, using the above described possibilities, for example. With such a subframe structure DMRS would always be available also when a symbol carrying feedback information on short TTI downlink transmission(s) is received.
  • Figures 16 and 17 illustrate examples how the short TTI downlink transmission feedback information may be mapped. In the examples it is assumed that 7-symbol virtual TTI and 14-symbol normal TTI are used in the uplink.
  • sTTI 7-symbol
  • Figure 17 illustrates a situation in which a short TTI used in the physical downlink shared channel (PDSCH) is smaller than the virtual TTI, that resulting to a fact that at least some of consecutive virtual TTIs will carry feedback information on more than one short TTI downlink transmission.
  • the short TTI is 2 symbols, and every other virtual TTI carry feedback information from 4 downlink sTTI transmissions, and every other virtual TTI carry feedback information from 3 downlink sTTI transmissions, as depicted by arrows in Figure 17.
  • the above described resource reservations for 7-symbol virtual TTIs ( Figures 9-13) can be used, assuming that sHARQ A/N fields carry feedback for multiple downlink short TTIs.
  • An advantage of the arrangement illustrated in Figure 17 is that a receiver in the base station may be simplified since thanks to 7-symbol virtual TTI every virtual TTI would include DMRS symbol even though the latency is reduced by using 2 -symbol sTTI in downlink.
  • Another example of a short TTI not being of same length as the virtual TTI is to use 2-symbol short TTI in the downlink, and alternating virtual TTI lengths of 4- and 3-symbols, as illustrated in Figure 14, or 4-symbol virtual TTIs overlapping on the DMRS symbol.
  • every fourth virtual TTIs would carry feedback information for 1 downlink sTTI, and the three remaining ones would carry feedback information for 2 downlink sTTIs.
  • Encoding feedback information for multiple sTTIs together is beneficial, especially when the feedback information is short: when the amount of bits encoded together increases, the more efficient coding schemes, such as Reed-Muller, convolu- tional coding, etc., can be used.
  • the benefit depends on a number of feed- back bits per sTTI. (In an extreme case, feedback information could be 1 bit.) Further, when the jointly coded payload, including the number of together coded short TTI feedback information bits, is large enough, additional protection mechanisms, like cyclic redundancy check CRC, may be used with an acceptable additional overhead.
  • additional protection mechanisms like cyclic redundancy check CRC, may be used with an acceptable additional overhead.
  • Figure 18 illustrates an exemplified information exchange between a base sta- tion (eNB) and a terminal device (UE).
  • eNB base sta- tion
  • UE terminal device
  • point 18-1 one or more values for TTIs to be used in downlink and/or uplink, and/or value for virtual TTI, and/or which kind of resource reservation should be used, and/or whether to use process described with Figure 5 or with Figure 6 and/or whether or not to allow autonomous power boost for the terminal device, and/or which kind of modulation and coding scheme to use for the uplink channel
  • the base station informs (information 18-2) the terminal device correspondingly.
  • the base station Upon receiving the information 18-2, the terminal device, starts in point 18-3 to act accordingly.
  • the terminal device if the autonomous power boost is allowed, the power of symbols carrying feedback information and other UCI may be boosted compared to power of non-UCI symbols. This way it is possible to compensate nTTI uplink channel performance degradation that the short TTI feedback information causes.
  • the terminal device may be configured to derive the amount of power boost based on the ratio of resource elements reserved for short TTI feedback and resource elements reserved for normal TTI UCI.
  • Information on whether to use process described with Figure 5 or with Figure 6 may be delivered by a predetermined information element of uplink grant, for example in a frequency hopping flag, or the radio resource control signaling may be used to convey the information.
  • the base station when it selects, whether to use the process de- scribed with Figure 5 or with Figure 6, it may determine the modulation and coding scheme, or bandwidth for the uplink channel, correspondingly: when the process described with Figure 6 ("dummy feedback information") is selected, the modulation and coding scheme, or at least required code rates, for physical uplink shared channel may be defined more accurately than what is defined when the process described with Figure 5 is selected, since in the process described with Figure 6 there is no downlink transmission detection.
  • Another example includes that when sTTI is configured to downlink the base station may select the modulation and coding scheme in a more conservative manner to maintain the uplink channel performance at a desired level and yet allow room for potential short TTI feedback information.
  • the base station is configured accordingly, i.e. to receive the short TTI feedback information on top of normal TTI uplink transmission from the terminal device.
  • Some of the blocks or part of the blocks or one or more pieces of information can also be left out or replaced by a corresponding block or part of the block or one or more pieces of information.
  • the feedback information may be multiplexed with DMRS, for example by means of interleaved frequency division multiplexing (IFDM).
  • IFDM interleaved frequency division multiplexing
  • 7-symbol short TTI i.e. one slot short TTI
  • blocks 408 and 409 may be omitted in implemen- tations configured to support only seven symbol short TTI.
  • an apparatus/ terminal device configured to support virtual transmission time interval concept based on at least partly on what is disclosed above with any of Figures 1 to 18, including implementing one or more functions/operations of a corre- sponding terminal device described above with an embodiment/example, for example by means of any of Figures 2 to 18, comprises not only prior art means, but also means for implementing the one or more functions/operations of a corresponding functionality described with an embodiment, for example by means of any of Figures 2 to 18, and it may comprise separate means for each separate function/operation, or means may be configured to perform two or more functions/operations.
  • one or more of the means and/or the feedback transmitting unit described above may be implemented in hardware (one or more devices), firmware (one or more devices), software (one or more modules), or combinations thereof.
  • the apparatuses) of embodiments may be implemented within one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing de- vices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, logic gates, other electronic units designed to perform the functions described herein by means of Figures 1 to 18, or a combination thereof.
  • ASICs application-specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing de- vices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processors controllers, micro-controllers, microprocessors, logic gates, other electronic units designed to perform the functions described herein by means of Figures 1
  • the implementation can be carried out through modules of at least one chipset (e.g. procedures, functions, and so on) that perform the functions described herein.
  • the software codes may be stored in a memory unit and executed by processors.
  • the memory unit may be implemented within the processor or externally to the processor. In the latter case, it can be communicatively coupled to the processor via various means, as is known in the art.
  • the components of the systems described herein may be rearranged and/or complemented by additional components in order to facilitate the achievements of the various aspects, etc., described with regard thereto, and they are not limited to the precise configurations set forth in the given figures, as will be appreciated by one skilled in the art.
  • Figure 19 provides an apparatus according to some embodiments of the invention.
  • Figure 19 illustrates an apparatus configured to carry out the functions de- scribed above in connection with the terminal device.
  • Each apparatus may comprise one or more communication control circuitry, such as at least one processor 1902, and at least one memory 1904, including one or more algorithms 1903, such as a computer program code (software) wherein the at least one memory and the computer program code (software) are configured, with the at least one processor, to cause the apparatus to carry out any one of the exemplified functionalities of the terminal device.
  • communication control circuitry such as at least one processor 1902, and at least one memory 1904, including one or more algorithms 1903, such as a computer program code (software) wherein the at least one memory and the computer program code (software) are configured, with the at least one processor, to cause the apparatus to carry out any one of the exemplified functionalities of the terminal device.
  • the memory 1904 may be implemented using any suitable data storage technology, such as semiconductor based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the memory may comprise a configuration database for storing transmission time interval configuration data, as described above, for example with Figure 1.
  • the apparatus may further comprise different interfaces 1901, such as one or more user interfaces, for example a screen, microphone and one or more loudspeakers for interaction with the user, and one or more communication interfaces (TX/RX) comprising hardware and/or software for realizing communication connectivity according to one or more communication protocols.
  • the communication interface may provide the apparatus with communication capabilities to communicate in the cellular communication system and enable communication between different network nodes and between the terminal device and the different network nodes, for example.
  • the communication interface may comprise standard well-known components such as an amplifier, filter, frequency-converter, (de) modulator, and encoder/decoder circuitries and one or more antennas.
  • the communication interfaces may comprise radio interface components providing the network node and the terminal device with radio communication capability in the cell.
  • the apparatus 1900 may comprise one or more user interfaces, such as a screen, microphone and one or more loudspeakers for interaction with the user.
  • At least one of the communication control circuitries in the apparatus 1900 is configured to provide the feedback transmitting unit, or any corresponding sub-unit, and to carry out functionalities described above by means of any of Figures 2 to 18 by one or more circuitries.
  • circuitry refers to all of the following: (a) hardware-only circuit implementations, such as implementations in only analog and/or digital circuitry, and (b) combinations of circuits and soft- ware (and/or firmware), such as (as applicable): (i) a combination of processor (s) or (ii) portions of processors/software including digital signal processor(s), software, and memory(ies) that work together to cause an apparatus to perform various functions, and (c) circuits, such as a microprocessor(s) or a portion of a microprocessor(s), that require software or firm- ware for operation, even if the software or firmware is not physically present.
  • circuitry' applies to all uses of this term in this application.
  • the term 'circuitry' would also cover an implementation of merely a processor (or multiple processors) or a portion of a processor and its (or their) accompanying software and/or firmware.
  • the term 'circuitry' would also cover, for ex- ample and if applicable to the particular element, a baseband integrated circuit or applications processor integrated circuit for a mobile phone or a similar integrated circuit in a server, a cellular network device, or another network device.
  • the at least one processor, the memory, and the computer program code form processing means comprises one or more computer program code portions for carrying out one or more operations according to any one of the embodiments of Figures 2 to 18 or operations thereof.
  • Embodiments as described may also be carried out in the form of a computer process defined by a computer program or portions thereof.
  • Embodiments of the methods described in connection with Figures 2 to 18 may be carried out by executing at least one portion of a computer program comprising corresponding instructions.
  • the computer program may be in source code form, object code form, or in some intermediate form, and it may be stored in some sort of carrier, which may be any entity or device capable of carrying the program.
  • the computer program may be stored on a computer program distribution medium readable by a computer or a processor.
  • the computer program medium may be, for example but not limited to, a record medium, computer memory, read-only memory, electrical carrier signal, telecommunications signal, and software distribution package, for example.
  • the computer program medium may be a non-transitory medium. Coding of software for carrying out the embodiments as shown and described is well within the scope of a person of ordinary skill in the art.

Landscapes

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

Abstract

L'invention consiste à déterminer, pour une ou plusieurs transmissions en liaison descendante à l'aide d'au moins un intervalle de temps de transmission de longueur raccourcie (sTTI), sur la base du ou des sTTI, au moins une ressource temporelle à partir d'un canal de liaison montante pour des informations de rétroaction. Si la ou les ressources temporelles coïncident avec une transmission de canal en liaison montante configurée pour au moins un intervalle de temps de transmission (nTTI) ayant une longueur plus longue que la longueur du ou des sTTI, l'invention consiste à déterminer la ou les ressources temporelles devant être sur le canal de liaison montante dans au moins un segment d'au moins un nTTI, une durée du ou des segments étant au moins la durée du ou des sTTI et, au plus, la moitié de la durée du ou des nTTI ; et à entraîner la transmission des informations de rétroaction dans la ou les ressources temporelles.
PCT/FI2016/050199 2016-03-31 2016-03-31 Intervalles de temps de transmission de différentes longueurs Ceased WO2017168036A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/FI2016/050199 WO2017168036A1 (fr) 2016-03-31 2016-03-31 Intervalles de temps de transmission de différentes longueurs
EP16896661.2A EP3437404A4 (fr) 2016-03-31 2016-03-31 Intervalles de temps de transmission de différentes longueurs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2016/050199 WO2017168036A1 (fr) 2016-03-31 2016-03-31 Intervalles de temps de transmission de différentes longueurs

Publications (1)

Publication Number Publication Date
WO2017168036A1 true WO2017168036A1 (fr) 2017-10-05

Family

ID=59962655

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2016/050199 Ceased WO2017168036A1 (fr) 2016-03-31 2016-03-31 Intervalles de temps de transmission de différentes longueurs

Country Status (2)

Country Link
EP (1) EP3437404A4 (fr)
WO (1) WO2017168036A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111480382A (zh) * 2018-02-07 2020-07-31 Oppo广东移动通信有限公司 用户设备及其无线通信方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009104922A2 (fr) * 2008-02-22 2009-08-27 Lg Electronics Inc. Procédé d'attribution d'un intervalle de temps d'émission dynamique
WO2013112703A2 (fr) * 2012-01-24 2013-08-01 Interdigital Patent Holdings, Inc. Systèmes et procédés d'amélioration de la couverture en liaison ascendante
EP2635082A1 (fr) * 2012-02-29 2013-09-04 Panasonic Corporation Regroupement de sous-trames dynamiques
WO2015139795A1 (fr) * 2014-03-21 2015-09-24 Telefonaktiebolaget L M Ericsson (Publ) Procédé, système et dispositif de commutation d'un intervalle de temps de transmission

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009104922A2 (fr) * 2008-02-22 2009-08-27 Lg Electronics Inc. Procédé d'attribution d'un intervalle de temps d'émission dynamique
WO2013112703A2 (fr) * 2012-01-24 2013-08-01 Interdigital Patent Holdings, Inc. Systèmes et procédés d'amélioration de la couverture en liaison ascendante
EP2635082A1 (fr) * 2012-02-29 2013-09-04 Panasonic Corporation Regroupement de sous-trames dynamiques
WO2015139795A1 (fr) * 2014-03-21 2015-09-24 Telefonaktiebolaget L M Ericsson (Publ) Procédé, système et dispositif de commutation d'un intervalle de temps de transmission

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3437404A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111480382A (zh) * 2018-02-07 2020-07-31 Oppo广东移动通信有限公司 用户设备及其无线通信方法

Also Published As

Publication number Publication date
EP3437404A1 (fr) 2019-02-06
EP3437404A4 (fr) 2019-11-27

Similar Documents

Publication Publication Date Title
US12010706B2 (en) Uplink subframe shortening in time-division duplex (TDD) systems
CA2950411C (fr) Raccourcissement de sous-trames de liaison descendante dans des systemes en duplexage par repartition dans le temps (tdd)
CN112740798A (zh) 最小调度延迟信令
EP3531779A1 (fr) Procédé et appareil pour transmettre des informations de commande et de données dans un système de communication cellulaire sans fil
JP2020533890A (ja) アップリンク肯定応答マッピングおよびリソース割振り
JP2020533873A (ja) 物理アップリンク共有チャネル（ｐｕｓｃｈ）上のアップリンク制御情報（ｕｃｉ）ピギーバックに対するリソース（ｒｅ）マッピングルール
EP3566367B1 (fr) Procédés, dispositif et noeud destinés à adapter une numérologie en fonction d'une position d'un dispositif sans fil
WO2017168039A1 (fr) Synchronisation de rétroaction
US12381662B2 (en) Control channel carrier switching for subslot-based cells
EP3577983A1 (fr) Ressources de liaison montante pour une communication ultra-fiable et à faible latence
JP2021505040A (ja) 例示的なアップリンク制御情報（ｕｃｉ）レイヤマッピング
JP2020526072A (ja) ダウンリンクおよびアップリンクダウンリンク制御情報長を整合させるための動的パディングフィールド
WO2023015106A1 (fr) Procédure de canal d'accès aléatoire commandée par pdcch pour équipement utilisateur à capacité réduite
US11665714B2 (en) Power saving by adapting active beam number related parameters
EP4500976A1 (fr) Améliorations apportées aux informations de commande de liaison descendante communes au groupe pour un déclenchement de signal de référence de sondage
WO2022246632A1 (fr) Applicabilité d'état d'indicateur de configuration de transmission avant un accusé de réception
US20230354125A1 (en) Enhanced measurement object configurations and procedures
EP4515704A1 (fr) Rapport de capacité de gestion de faisceau d'équipement utilisateur
WO2017168036A1 (fr) Intervalles de temps de transmission de différentes longueurs
WO2024229794A1 (fr) Transmission opportuniste de signaux de référence
WO2023212222A1 (fr) Configurations et procédures d'objet de mesure améliorées
WO2023211646A1 (fr) Rapport de capacité de gestion de faisceau d'équipement utilisateur
KR20240096498A (ko) 서브슬롯 기반 셀들에 대한 제어 채널 캐리어 스위칭

Legal Events

Date Code Title Description
NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2016896661

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2016896661

Country of ref document: EP

Effective date: 20181031

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16896661

Country of ref document: EP

Kind code of ref document: A1