WO2017166294A1 - Procédé et appareil pour déterminer une taille de bloc de transmission pour un intervalle de temps de transmission court - Google Patents

Procédé et appareil pour déterminer une taille de bloc de transmission pour un intervalle de temps de transmission court Download PDF

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Publication number
WO2017166294A1
WO2017166294A1 PCT/CN2016/078333 CN2016078333W WO2017166294A1 WO 2017166294 A1 WO2017166294 A1 WO 2017166294A1 CN 2016078333 W CN2016078333 W CN 2016078333W WO 2017166294 A1 WO2017166294 A1 WO 2017166294A1
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WO
WIPO (PCT)
Prior art keywords
stti
tbs
pdcch
length
symbols
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Application number
PCT/CN2016/078333
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English (en)
Inventor
Naizheng ZHENG
Chunli Wu
Yanji Zhang
Nan HAO
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Nokia Technologies Oy
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Publication date
Application filed by Nokia Technologies Oy filed Critical Nokia Technologies Oy
Priority to PCT/CN2016/078333 priority Critical patent/WO2017166294A1/fr
Publication of WO2017166294A1 publication Critical patent/WO2017166294A1/fr

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    • 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
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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

Definitions

  • the present invention generally relates to communication network, more specifically, relates to a method and apparatus for determining Transmission Block Size (TBS) for short Transmission Time Interval (sTTI) .
  • TBS Transmission Block Size
  • sTTI Transmission Time Interval
  • TTI shortening is considered as one technique from PHY-layer point of view, in addition, the discussion on how to configure TTI length for DL and UL is still ongoing, the asymmetric TTI length for DL and UL is one potential configuration.
  • the number of OFDM symbols for PDSCH/PUSCH is much less than that in legacy, the TBS table used in legacy would not be usable for corresponding number of PRBs and MCS index.
  • the present invention provides a method and apparatus for determining TBS for sTTI.
  • a method for determining TBS for sTTI comprising:
  • an apparatus for determining TBS for sTTI comprising:
  • sTTI Downlink
  • UL Uplink
  • the provided method and apparatus may derive appropriate TBS corresponding to the sTTI in both DL and UL.
  • Fig. 1 is a flowchart illustrating a method for determining TBS for sTTI in accordance with one embodiment of the present invention
  • Fig. 2 is a flowchart illustrating a method for determining TBS for sTTI in accordance with another embodiment of the present invention.
  • the invention proposes the following aspects are considered when scaling the TBS or N_PRB for short TTI:
  • sTTI length (sTTI_length) ;
  • CFI control field indicator
  • index of sTTI within 1ms subframe which may lead to different number of OFDM symbols used for PDSCH for sTTI (named as sPDSCH hereafter) .
  • a factor may be multiplied to the TBS after scaling.
  • the factor may be either pre-defined, or configured via RRC when configuring sTTI.
  • the present invention provides a method for determining TBS for sTTI, which may comprise: at step S101, determining whether the sTTI is on Downlink (DL) or Uplink (UL) ; at step S102, calculating TBS for sTTI by using legacy TBS, the length of sTTI and the number of symbols (such as OFDMA symbols) for PDCCH if the sTTI is on DL; and at step S103, scaling legacy TBS according to the length of sTTI if the sTTI is on UL.
  • DL Downlink
  • UL Uplink
  • TBS for sTTI may be derived based on legacy TBS table without introducing new TBS table.
  • the method may further comprise: at step S104, multiplying the calculated TBS with a factor when L1 overhead becomes higher for sTTI, wherein the factor is pre-defined, or configured via RRC.
  • step S102 may further comprise: determining whether a first sTTI starts from Physical Downlink Shared Channel (PDSCH) region after Physical Downlink Control Channel (PDCCH) region or not; and calculating TBS for sTTI by using legacy TBS, the length of sTTI and the number of symbols for PDCCH according to whether the first sTTI starts from PDSCH region after the PDCCH region or not.
  • PDSCH Physical Downlink Shared Channel
  • PDCCH Physical Downlink Control Channel
  • N PDCCH represents the number of symbols for PDCCH
  • sTTI_length represents the length of sTTI
  • the step of calculating TBS for sTTI by using legacy TBS the length of a sTTI and the number of symbols for PDCCH according to the sTTI is the first sTTI or not may further comprise:
  • TBS_sTTI1 floor (legacy_TBS *sTTI_length/ (14-N PDCCH ) )
  • TBS_sTTI1 represents the value of the TBS to be calculated for sTTI
  • legacy_TBS represents the value of TBS in legacy table
  • the first sTTI does not start from PDSCH region after the PDCCH region, which may means that the first sTTI contains only ( (14-N PDCCH ) mod sTTI_length) number of OFDM symbols for PDSCH,
  • the length of a sTTI and the number of symbols for PDCCH according to the sTTI is the first sTTI or not.
  • the step of calculating TBS for sTTI by using legacy TBS, the length of a sTTI and the number of symbols for PDCCH according to the sTTI is the first sTTI or not may further comprise:
  • TBS_sTTI1 floor (legacy_TBS * ( (14 -N PDCCH ) mod sTTI_length) / (14-N PDCCH ) )
  • TBS_sTTI1 represents the value of the TBS for the first sTTI
  • TBS_sTTIx floor (legacy_TBS *sTTI_length/ (14-N PDCCH ) ) .
  • step S102 may further comprise:
  • a procedure for calculating TBS for DL sTTI may be given as follows:
  • TBS_sTTI floor (legacy_TBS *sTTI_length/ (14-N PDCCH ) )
  • TBS_sTTI1 floor (legacy_TBS * ( (14 -N PDCCH ) mod sTTI_length) / (14-N PDCCH ) )
  • TBS_sTTIx floor (legacy_TBS *sTTI_length/ (14-N PDCCH ) )
  • step S103 may further comprise:
  • TBS1 floor (legacy_TBS * ( (14 -N PDCCH ) mod 7) / (14-N PDCCH ) )
  • N PDCCH is the number of OFDMA symbols used for legacy PDCCH
  • TBS2 floor (legacy_TBS *7/ (14-3) ) .
  • legacy PDCCH region has 2 or 4 symbols:
  • TBS floor (legacy_TBS *2/ (14-N PDCCH ) ) .
  • the first sTTI will contain only 1 OFDMA symbol for sTTI PDSCH:
  • TBS1 floor (legacy_TBS / (14-N PDCCH ) )
  • TBS floor (legacy_TBS *2/ (14-N PDCCH ) ) .
  • step S104 may further comprise:
  • TBS equals to half of the legacy TBS.
  • the method may further comprise: calculating the number of PRBs allocated for the sTTI and an alpha defined corresponding to the number of symbols for sPDSCH by using the length of sTTI, Control Field Indicator (CFI) and index of the sTTI in the subframe;
  • CFI Control Field Indicator
  • TBS finding TBS from a TBS table according to the converted number of PRBs and Modulation and Coding Scheme (MCS) .
  • MCS Modulation and Coding Scheme
  • the step of converting is performed by using the following equation:
  • N PRB maximum ⁇ floor (N PRB ’ *alpha) , 1 ⁇
  • N PRB is the number of PRBs converted for the sTTI
  • N PRB ’ is the number of PRBs allocated for the sTTI.
  • different alpha value can be defined for PDSCH/PUSCH containing different number of OFDMA symbols.
  • CFI sTTI length and the index of sTTI within the 1ms subframe
  • the UE calculates number of OFDMA symbols and selects the corresponding alpha value to convert the number of PRB.
  • the calculated N PRB could be applied by the UE together with the MCS to find the TBS in the legacy TBS table .
  • alpha1 ⁇ alpha7 can be defined corresponding to sPDSCH of 1 ⁇ 7 OFDMA symbols for sTTI.
  • the UE may calculate the corresponding alpha and N PRB .
  • new TBS tables introduced for sTTI for example, new TBS tables for 1-/2-/3-/4-/5-/6-/7-OFDM symbols for sPDSCH may be defined.
  • the method may further comprise:
  • the step of calculating the TBS table index may further comprise:
  • the TBS table index equals to the length of sTTI
  • the TBS table index for the first sTTI equals to the (14-number of symbols for PDCCH) mod length of sTTI
  • the TBS table index for the rest sTTI equals to the length of sTTI.
  • the Table_index may be derived by an exemplary procedure as follows:
  • the present invention may support determining TBS according the exact number of symbols available for sPDSCH.
  • a multiply of TBS tables are newly defined corresponding to the number of symbols.
  • two TBS tables are newly defined corresponding to the number of symbols, one of which is corresponding to 2-symbol sTTI, and the other one of which is corresponding to 7-symbol sTTI; alternatively, three TBS tables are newly defined corresponding to the number of symbols, the first of which is corresponding to 1-symbol sTTI, the second of which is corresponding to 2-symbol sTTI, and the third one of which is corresponding to 7-symbol sTTI.
  • the available data Resource Elements (REs) in either even-slot or odd-slot is still varying a lot depends on the 1) TTI length, 2) sTTI position with 1ms, and 3) CFI size, 4) MIMO TM related to the applied RS. Impact of different number of RS is not considered when selecting table index.
  • TBS-scaling factor discussed in above can also be applied at here.
  • the factor can either be pre-defined in the specification or configured via RRC when configure sTTI.
  • the present invention further provides an apparatus for determining TBS for sTTI, which may comprise:
  • sTTI Downlink
  • UL Uplink
  • the apparatus may further comprise:
  • the length of sTTI and the number of symbols for PDCCH is further configured to:
  • PDSCH Physical Downlink Shared Channel
  • PDCCH Physical Downlink Control Channel
  • TBS for sTTI by using legacy TBS, the length of sTTI and the number of symbols for PDCCH according to whether the first sTTI starts from PDSCH region after the PDCCH region or not.
  • N PDCCH represents the number of symbols for PDCCH
  • sTTI_length represents the length of sTTI
  • the length of sTTI and the number of symbols for PDCCH according to whether the first sTTI starts from PDSCH region after the PDCCH region or not is further configured to:
  • TBS calculate TBS by using the following equation:
  • TBS_sTTI1 floor (legacy_TBS *sTTI_length/ (14-N PDCCH ) )
  • TBS_sTTI1 represents the value of the TBS to be calculated for sTTI
  • legacy_TBS represents the value of TBS in legacy table
  • TBS for sTTI by using legacy TBS, the length of a sTTI and the number of symbols for PDCCH according to the sTTI is the first sTTI or not.
  • the length of a sTTI and the number of symbols for PDCCH according to the sTTI is the first sTTI or not is further configured to:
  • TBS_sTTI1 floor (legacy_TBS * ( (14 -N PDCCH ) mod sTTI_length) / (14-N PDCCH ) )
  • TBS_sTTI1 represents the value of the TBS for the first sTTI
  • TBS_sTTIx floor (legacy_TBS *sTTI_length/ (14-N PDCCH ) ) .
  • the length of sTTI and the number of symbols for PDCCH is further configured to:
  • TBS calculate TBS by using the number of symbols for PDCCH according to the length of sTTI and whether the sTTI is the first sTTI or not.
  • means for scaling legacy TBS according to the length of sTTI is further configured to:
  • TBS equals to half of the legacy TBS.
  • the apparatus may further comprise:
  • TBS means for finding TBS from a TBS table according to the converted number of PRBs and Modulation and Coding Scheme (MCS) .
  • MCS Modulation and Coding Scheme
  • means for converting is configured to perform converting by using the following equation:
  • N PRB maximum ⁇ floor (N PRB ’ *alpha) , 1 ⁇
  • N PRB is the number of PRBs converted for the sTTI
  • N PRB ’ is the number of PRBs allocated for the sTTI.
  • the apparatus may further comprise:
  • means for calculating the TBS table index is further configured to:
  • the TBS table index equals to the length of sTTI
  • the TBS table index for the first sTTI equals to the length of sTTI
  • the TBS table index for the rest sTTI equals to the length of sTTI
  • TBS tables are newly defined corresponding to the number of symbols, which corresponding to 2-symbol sTTI and 7-symbol sTTI respectively; or three TBS tables are newly defined corresponding to the number of symbols, which corresponding to 1-symbol sTTI, 2-symbol sTTI and 7-symbol sTTI respectively.
  • At least one of the above means is assumed to comprise program instructions that, when executed, enable the apparatus to operate in accordance with the exemplary embodiments, as discussed above.
  • Any of the above means as discussed above may be integrated together or implemented by separated components, and may be of any type suitable to the local technical environment, and may comprise one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSP) and processors based on multi-core processor architectures, as non-limiting examples.
  • the ROM mentioned above 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 various exemplary embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • While various aspects of the exemplary embodiments of this invention may be illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • exemplary embodiments of the inventions may be embodied in computer-executable instructions, such as in one or more program modules, executed by one or more computers or other devices.
  • program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types when executed by a processor in a computer or other device.
  • the computer executable instructions may be stored on a computer readable medium such as a hard disk, optical disk, removable storage media, solid state memory, random access memory (RAM) , and etc.
  • RAM random access memory
  • the functionality of the program modules may be combined or distributed as desired in various embodiments.
  • the functionality may be embodied in whole or in part in firmware or hardware equivalents such as integrated circuits, field programmable gate arrays (FPGA) , and the like.

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

Abstract

L'invention concerne un procédé et un appareil pour déterminer une taille de bloc de transmission (TBS) pour un intervalle de temps de transmission court (sTTI), le procédé consistant : à déterminer si le sTTI est sur une liaison descendante (DL) ou une liaison montante (UL); à calculer une TBS pour un sTTI par utilisation d'une TBS patrimoniale, de la longueur du sTTI et du nombre de symboles pour un PDCCH si le sTTI est sur une DL; et à mettre à l'échelle la TBS patrimoniale selon la longueur du sTTI si le sTTI est sur une liaison montante (UL). De cette manière, le procédé et l'appareil proposés peuvent dériver une TBS appropriée correspondant au sTTI à la fois dans la DL et l'UL.
PCT/CN2016/078333 2016-04-01 2016-04-01 Procédé et appareil pour déterminer une taille de bloc de transmission pour un intervalle de temps de transmission court WO2017166294A1 (fr)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10375717B2 (en) * 2016-05-09 2019-08-06 Spreadtrum Communications (Shanghai) Co., Ltd. User equipment and data transmission method thereof
WO2019154016A1 (fr) * 2018-02-12 2019-08-15 中国信息通信研究院 Procédé et dispositif de transmission d'informations de liaison montante
WO2019160824A1 (fr) * 2018-02-15 2019-08-22 Qualcomm Incorporated Taille de bloc de transport pour canaux à intervalle de temps de transmission court
WO2019157649A1 (fr) * 2018-02-13 2019-08-22 华为技术有限公司 Procédé et dispositif de communication
CN110661605A (zh) * 2018-06-29 2020-01-07 普天信息技术有限公司 一种确定sTTI系统的下行业务信道TBS的方法
CN112219421A (zh) * 2018-04-05 2021-01-12 株式会社Ntt都科摩 用户终端以及无线基站

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10375717B2 (en) * 2016-05-09 2019-08-06 Spreadtrum Communications (Shanghai) Co., Ltd. User equipment and data transmission method thereof
WO2019154016A1 (fr) * 2018-02-12 2019-08-15 中国信息通信研究院 Procédé et dispositif de transmission d'informations de liaison montante
WO2019157649A1 (fr) * 2018-02-13 2019-08-22 华为技术有限公司 Procédé et dispositif de communication
WO2019160824A1 (fr) * 2018-02-15 2019-08-22 Qualcomm Incorporated Taille de bloc de transport pour canaux à intervalle de temps de transmission court
US11258572B2 (en) 2018-02-15 2022-02-22 Qualcomm Incorporated Transport block size for channels with shortened transmission time interval
CN112219421A (zh) * 2018-04-05 2021-01-12 株式会社Ntt都科摩 用户终端以及无线基站
CN112219421B (zh) * 2018-04-05 2024-07-23 株式会社Ntt都科摩 用户终端以及无线基站
CN110661605A (zh) * 2018-06-29 2020-01-07 普天信息技术有限公司 一种确定sTTI系统的下行业务信道TBS的方法

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