Classifications

• • 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 signaling, i.e. of overhead other than pilot signals
  • H04L5/0057—Physical resource allocation for CQI
• • 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
  • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
  • H04L1/0026—Transmission of channel quality indication
• • 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 signaling, i.e. of overhead other than pilot signals
• • 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
  • H04L5/02—Channels characterised by the type of signal
• • 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
  • H04L1/1607—Details of the supervisory signal
  • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
• • 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

Definitions

• An additional example of an embodiment includes a computer program, comprising code for performing the method of the previous paragraph, when the computer program is run on a processor.
• FIG. 7 illustrates a non-limiting example message for configuring Channel Quality Indicator (CQI) reporting according to an example embodiment
• the feedback module may be implemented as feedback module 140-2, which is implemented as computer program code 123 and is executed by the one or more processors 120.
• the one or more memories 125 and the computer program code 123 may be configured to, with the one or more processors 120, cause the user equipment 1 10 to perform one or more of the operations as described herein.
• the UE 1 10 communicates with eNB 170 via a wireless link 11 1.
• the one or more buses 157 may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, wireless channels, and the like.
• the one or more transceivers 160 may be implemented as a remote radio head (RRH) 195, with the other elements of the eNB 170 being physically in a different location from the RRH, and the one or more buses 157 could be implemented in part as fiber optic cable to connect the other elements of the eNB 170 to the RRH 195.
• RRH remote radio head
• each cell can correspond to a single carrier and an eNB may use multiple carriers. So, if there are three 120 degree cells per carrier and two carriers, then the eNB has a total of 6 cells.
• the wireless network 100 may include one or more network control elements (NCE) 190 that may include MME (Mobility Management Entity) and/or SGW (Serving Gateway) functionality, and which provides connectivity with a further network, such as a telephone network and/or a data communications network (e.g., the Internet).
• the eNB 170 is coupled via a link 131 to the NCE 190.
• the link 131 may be implemented as, e.g., an S I interface.
• the NCE 190 includes one or more processors 175, one or more memories 171 , and one or more network interfaces (N/W I/F(s)) 180, interconnected through one or more buses 185.
• the one or more memories 171 include computer program code 173.
• the one or more memories 171 and the computer program code 173 are configured to, with the one or more processors 175, cause the NCE 190 to perform one or more operations.
• the wireless network 100 may implement network virtualization, which is the process of combining hardware and software network resources and network functionality into a single, software-based administrative entity, a virtual network.
• Network virtualization involves platform virtualization, often combined with resource virtualization.
• Network virtualization is categorized as either external, combining many networks, or parts of networks, into a virtual unit, or internal, providing network- like functionality to software containers on a single system. Note that the virtualized entities that result from the network virtualization are still implemented, at some level, using hardware such as processors 152 or 175 and memories 155 and 171 , and also such virtualized entities create technical effects.
• the computer readable memories 125, 155, and 171 may be of any type suitable to the local technical environment and 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 computer readable memories 125, 155, and 171 may be means for performing storage functions.
• the processors 120, 152, and 175 may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi-core processor architecture, as non- limiting examples.
• the processors 120, 152, and 175 may be means for performing functions, such as controlling the UE 1 10, eNB 170, and other functions as described herein.
• An eNB configures a UE to measure downlink experienced channel quality on a grid of N time-domain resources and M frequency domain resources.
• the eNB also configures the UE to report a CQI value that at maximum will result in BLEP of X% if the eNB transmits with MCS corresponding to the index of CQI.
• the configuration in this step is performed by the network (e.g. eNB) and the number of measurement samples is based on the grid of resources.
• the channel quality can, for example, be measured as the experienced SINR by the UE.
• the UE sorts the K measurement samples of its experienced channel quality, and uses these measurement samples to build an empirical sample distribution of the experienced channel quality.
• SINR experienced channel quality
• the UE may utilize a look-up table, such as an internal look-up table, to determine the highest supported MCS for an SINR value of SINR outage that it can decode with a BLEP no higher than X%.
• this look-up table comprises BLEP versus SINR for the supported MCSs (or at least MCSs that can be reported as part of the CQI).
• a non-limiting example lookup table is shown in FIG. 3 A, where the example look-up table includes three columns, namely, a column for BLEP values; a column for ranges of SINR values; and a column for different MCSs.
• Another non-limiting example is a look-up table that includes a set of curves for the BLEP versus SINR, where each curve corresponds to a supported MCS that may be signaled back to the eNB as part of the CQI report.
• An example is shown in FIG. 3B which illustrates a graph of BLEP versus SINR values for a set of curves corresponding to different MCSs.
• the lookup tables in FIGS. 3 A and 3B are merely examples, and not intended to be limiting.
• mapping the SINR to CQI may be performed prior to determining the empirical X%-ile of the quantized values.
• Q may be configured by the eNB as part of step 1 above. This may be particularly useful for cases where the number of K samples is insufficient to reliably determine the SINR value at the X% outage.
• the eNB (e.g. eNB 170) transmits an RRC configuration to the UE (e.g. UE 1 10) which includes at least one BLEP constraint and an indication of resources to be measured.
• the indication of resources is denoted N and M corresponding to N time-domain resources and M frequency domain resources to be measured, respectively.
• the UE performed channel measures over the time duration, N, and frequency resolution, M, to collect a number, K, of measurements. The UE only keeps the lowest Q ⁇ , Qi ,.
• the UE transmits a set of the estimated MCSs to the eNB, namely, ⁇ MCS ⁇ , MCSi ,. .. , GSj ⁇ .
• the UE may be configured to repeat steps 504-506 if the UE is configured for periodic CQI reporting.
• this figure shows a non-limiting example message 700 for configuring Channel Quality Indicator (CQI) reporting according to an example embodiment.
• the message 700 may be transmitted used by the eNB to configure the UE for CQI reporting.
• the message 700 in this example is a periodic CQI reporting message as defined in LTE Release 8 (i.e. 3GPPP 36.331 , "Radio resource control"), where the CQI is configured as part of the RRC configuration process (RRC Connection Setup or RRC Connection Reconfiguration).
• the underlined portion of the message 700 shows the additional information that may be used for configuring the UE for the CQI reporting.
• the UE sends a CQI report from the UE to eNB.
• This CQI may be included as part of the UE channel state information (CSI) report.
• the CSI report is sent to the eNB in the LTE PUCCH.
• Different formats are defined to support normal or extended cyclic prefix, multiplexing or not with 1 or 2 - bit HARQ-ACK, etc. (see, e.g. 3GPP 36.213).
• New formats for supporting enhanced CQI may be defined.
• the maximum length for the CSI report is 21 bits, corresponding to format 3 for TDD with up to 5 CCs.
• Format 4 and 5 have been defined with a larger message.
• the support of enhanced CQI for URLLC requires a larger message size, and therefore a new format, since multiple CQI values may be reported in a single message.
• the processes described above may be applied for both periodic and aperiodic CQI feedback report.
• the delay between the CQI request and CQI report can be reduced if the UE continuously monitors and collects channel quality measurements.
• the UE may determine the CQI based on the N most recent measurements.
• the recording window length N is configured to be large enough to provide a relatively good level of accuracy to the percentiles of interest. This is especially relevant for URLLC use cases, where information up to the 10 -5 percentile can be required.
• the recording window length can also be adjusted in accordance to the channel properties, e.g. coherence, variance, stationarity, etc.
• coherence e.g. coherence
• variance e.g., stationarity
• One challenge with this option is that many individual values are needed to have reliable measures of low percentiles, and sorting as such is an expensive operation. These issues may be addressed by using tree structures, and every time new individual values are available, they can be inserted, after removing any obsolete values. Pointers to all the individual values may be kept in a ring buffer to have pointers to obsolete values.
• a "biased" IIR filter is applied to each of the channel quality measurements y(t) as follows: l - f up ) ⁇ E b (t - 1) + f up ⁇ y(t) if (t) ⁇ E b t
• the method may include generating, by the user equipment, a channel quality distribution based on the channel quality measurements.
• the at least one processing value may include an indication of a position, and wherein estimating the MCS value comprises: determining an order of the channel quality measurements; and estimating the MCS value for the channel quality measurement corresponding to the measurement position index.
• the channel quality measurements are ordered from lowest to highest channel quality.
• the configuration may include a number of time domain resources and an indication of the frequency domain partition.
• the set may include two or more processing values, and the transmitting may include transmitting an indication of the estimated MCS value for each of the two or more processing values.
• the configuration may be a radio resource control (RRC) configuration and performing the measurements may include at least one of: performing periodic channel quality measurements based on the RRC configuration; and performing aperiodic channel quality measurements based on the RRC configuration.
• RRC radio resource control
• an apparatus may include at least one processor; and at least one non-transitory memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform: performing, by a user equipment of a wireless network, a number of channel quality measurements according to a configuration received by the network, wherein the configuration is indicative of the number of channel quality measurements to be performed and comprises a set comprising at least one processing value, the at least one value comprising either an average block-error probability (BLEP) value or a measurement position index; estimating a modulation and coding scheme (MCS) value for each processing value in the set based on the channel quality measurements; and transmitting, from the user equipment to a base station of the wireless network, an indication of the estimated MCS value.
• BLEP average block-error probability
• MCS modulation and coding scheme
• the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: generating, by the user equipment, a channel quality distribution based on the channel quality measurements.
• the at least one processing value may include an indication of a position, and wherein estimating the MCS value comprises: determining an order of the channel quality measurements; and estimating the MCS value for the channel quality measurement corresponding to the measurement position index.
• the channel quality measurements are ordered from lowest to highest channel quality.
• the configuration may include a number of time domain resources and an indication of the frequency domain partition.
• the set may include two or more processing values, and the transmitting may include transmitting an indication of the estimated MCS value for each of the two or more processing values.
• the configuration may be a radio resource control (RRC) configuration and performing the measurements may include at least one of: performing periodic channel quality measurements based on the RRC configuration; and performing aperiodic channel quality measurements based on the RRC configuration.
• RRC radio resource control
• FIG. 9 is a logic flow diagram for enhanced Channel Quality Indicator (CQI) measurement procedure for URLLC.
• CQI Channel Quality Indicator
• This figure further illustrates the operation of an exemplary method or methods, a result of execution of computer program instructions embodied on a computer readable memory, functions performed by logic implemented in hardware, and/or interconnected means for performing functions in accordance with exemplary embodiments.
• the an adaptation module 150-1 and/or 150-2 may include multiples ones of the blocks in FIG. 9, where each included block is an interconnected means for performing the function in the block.
• the blocks in FIG. 9 are assumed to be performed by a base station such as eNB 170, e.g., under control of the adaptation module 150-1 and/or 150- 2 at least in part.
• a method comprising: determining, by a base station of a wireless network, a configuration for a number of channel quality measurements to be performed by a user equipment for determining a modulation and coding scheme (MCS), configuration is indicative of the number of channel quality measurements to be performed and comprises a set comprising at least one processing value, the at least one value comprising either an average block-error probability (BLEP) value or a measurement position as indicated by block 900; transmitting, from the base station to the user equipment, the configuration as indicated by block 902; and receiving, from the user equipment, an indication of the estimated MCS value for each processing value in the set as indicated by block 904.
• MCS modulation and coding scheme
• the configuration may include a number of time domain resources and an indication of the frequency domain partition.
• the configuration may be a radio resource control (R C) configuration and indicates whether the channel quality measurements are either periodic or aperiodic.
• R C radio resource control
• an apparatus may comprise: at least one processor; and at least one non-transitory memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform: determining, by a base station of a wireless network, a configuration for a number of channel quality measurements to be performed by a user equipment for determining a modulation and coding scheme (MCS), wherein the configuration comprises at least an indication of the number of channel quality measurements to be performed and a set comprising at least one processing value; transmitting, from the base station to the user equipment, the configuration; and receiving, from the user equipment, an indication of the estimated MCS value for each processing value in the set.
• MCS modulation and coding scheme
• the set may include one or more average block-error probability (BLEP) values.
• BLEP block-error probability
• the set may comprise one or more measurement position indexes.
• the configuration may be a radio resource control (RRC) configuration and indicates whether the channel quality measurements are either periodic or aperiodic.
• RRC radio resource control
• the selecting the estimated MCS value may be based on a latency requirement of the wireless network.
• a base station may comprise an apparatus according to any one of paragraphs [0088]- [0094].
• an apparatus may comprise: means for determining, by a base station of a wireless network, a configuration for a number of channel quality measurements to be performed by a user equipment for determining a modulation and coding scheme (MCS), wherein the configuration comprises at least an indication of the number of channel quality measurements to be performed and a set comprising at least one processing value; means for transmitting, from the base station to the user equipment, the configuration; and means for receiving, from the user equipment, an indication of the estimated MCS value for each processing value in the set.
• MCS modulation and coding scheme
• a communication system may include an apparatus in accordance with any one of the paragraphs [0069]-[0077] and an apparatus in accordance with any one of paragraphs [0088]- [0094].
• a computer program may include program code for executing the method according to any of paragraphs [0060]-[0068] or [0081]-[0087].
• the computer program may be a computer program product comprising a computer-readable medium bearing computer program code embodied therein for use with a computer.
• a technical effect of one or more of the example embodiments disclosed herein is to address the challenges of LA for URLLC traffic, where the sporadic transmission of small packets leads to rapidly changing interference difficult to be tracked at the eNB side.
• the multiple CQI indexes (each with a different associated BLEP constraint) reported to the eNB allow to perform spectral-efficient link adaptation, as the BLEP can be flexibly adjusted in accordance to the latency and reliability constraint of each individual URLLC packet.
• Another technical effect of one or more of the example embodiments disclosed herein is to help meet URLLC requirements in challenging environments with rapid interference fluctuations.
• Embodiments herein may be implemented in software (executed by one or more processors), hardware (e.g., an application specific integrated circuit), or a combination of software and hardware.
• the software e.g., application logic, an instruction set
• a "computer-readable medium” may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer, with one example of a computer described and depicted, e.g., in FIG. 1.
• a computer-readable medium may comprise a computer-readable storage medium (e.g., memories 125, 155, 171 or other device) that may be any media or means that can contain, store, and/or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer.
• a computer-readable storage medium does not comprise propagating signals.
• the different functions discussed herein may be performed in a different order and/or concurrently with each other. Furthermore, if desired, one or more of the above- described functions may be optional or may be combined.
• eNB or eNodeB evolved Node B (e.g., an LTE base station)
• UE user equipment e.g., a wireless, typically mobile device

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

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• 2018
  • 2018-01-17 WO PCT/FI2018/050030 patent/WO2018142020A1/en unknown
  • 2018-01-17 EP EP18748717.8A patent/EP3577811A4/de not_active Withdrawn
  • 2018-01-17 JP JP2019541424A patent/JP6811333B2/ja active Active

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