Search

EP-3695663-B1 - METHOD AND APPARATUS FOR ADVANCING ACK/NACK TRANSMISSION IN WIRELESS COMMUNICATION SYSTEM

EP3695663B1EP 3695663 B1EP3695663 B1EP 3695663B1EP-3695663-B1

Inventors

  • YI, YUNJUNG
  • KIM, BYOUNGHOON

Dates

Publication Date
20260506
Application Date
20181012

Claims (9)

  1. A method performed by a user equipment, UE, in a wireless communication system, the method comprising: receiving a synchronization signal/physical broadcast channel block, SSB, from a network; obtaining a master information block, MIB, in the SSB; receiving, from the network, a system information block 1, SIB1, based on information for a control resource set, CORESET, included in the MIB; performing an access to a cell related to the network based on access information included in the SIB1; receiving (S1500) a downlink, DL, data from the network; determining an acknowledgement/negative-acknowledgement, ACK/NACK, transmission timing as a timing after a predetermined time interval from an end of a reception of the DL data, wherein the end of the reception of the DL data occurs at a slot index n which has an integer value, and wherein the predetermined time interval has an integer value k; based on latency to prepare a transmission of an ACK/NACK for the DL data being less than the predetermined time interval minus an offset, transmitting the ACK/NACK to the network by applying the offset to a timing advance, TA, so that the ACK/NACK is transmitted at the offset earlier than the ACK/NACK transmission timing; and transmitting (S1530) an uplink, UL, data to the network by applying the offset to the TA after transmitting the ACK/NACK, wherein the offset is configured by the network.
  2. The method of claim 1, wherein information on the offset is received via the SIB1.
  3. The method of claim 1, wherein the offset is configured per frequency range or per frequency band.
  4. The method of claim 1, wherein the offset is configured in terms of number of symbols based on a numerology used in the SSB.
  5. The method of claim 1, wherein the offset is configured in terms of number of symbols based on a numerology used in the SIB1.
  6. The method of claim 1, wherein the offset is configured in terms of number of symbols based on a numerology used in a UL subframe and/or a UL slot.
  7. The method of claim 1, wherein the offset is applied to a physical random access channel, PRACH, preamble transmission.
  8. A user equipment, UE, for use in a wireless communication system, the UE comprising: a memory; a transceiver, and at least one processor, operably coupled to the memory and the transceiver, configured to: control the transceiver to receive a synchronization signal/physical broadcast channel block, SSB, from a network; obtain a master information block, MIB, in the SSB; control the transceiver to receive, from the network, a system information block 1, SIB1, based on information for a control resource set, CORESET, included in the MIB; perform an access to a cell related to the network based on access information included in the SIB1; control the transceiver to receive a downlink, DL, data from the network; determine an acknowledgement/negative-acknowledgement, ACK/NACK, transmission timing as a timing after a predetermined time interval from an end of a reception of the DL data, wherein the end of the reception of the DL data occurs at a slot index n which has an integer value, and wherein the predetermined time interval has an integer value k; based on latency to prepare a transmission of an ACK/NACK for the DL data being less than the predetermined time interval minus an offset, control the transceiver to transmit the ACK/NACK to the network by applying the offset to a timing advance, TA, so that the ACK/NACK is transmitted at the offset earlier than the ACK/NACK transmission timing; and control the transceiver to transmit an uplink, UL, data to the network by applying the offset to the TA after transmitting the ACK/NACK, wherein the offset is configured by the network.
  9. The UE of claim 8, wherein the at least one processor is further configured to carry out the method of any claims 2 to 7.

Description

TECHNICAL FIELD The present invention relates to wireless communications, and more particularly, to a method and apparatus for shifting boundary of uplink subframe and/or uplink slot in a new radio access technology (RAT) system. BACKGROUND 3rd generation partnership project (3GPP) long-term evolution (LTE) is a technology for enabling high-speed packet communications. Many schemes have been proposed for the LTE objective including those that aim to reduce user and provider costs, improve service quality, and expand and improve coverage and system capacity. The 3GPP LTE requires reduced cost per bit, increased service availability, flexible use of a frequency band, a simple structure, an open interface, and adequate power consumption of a terminal as an upper-level requirement. Work has started in international telecommunication union (ITU) and 3GPP to develop requirements and specifications for new radio (NR) systems. 3GPP has to identify and develop the technology components needed for successfully standardizing the new RAT timely satisfying both the urgent market needs, and the more long-term requirements set forth by the ITU radio communication sector (ITU-R) international mobile telecommunications (IMT)-2020 process. Further, the NR should be able to use any spectrum band ranging at least up to 100 GHz that may be made available for wireless communications even in a more distant future. The NR targets a single technical framework addressing all usage scenarios, requirements and deployment scenarios including enhanced mobile broadband (eMBB), massive machine-type-communications (mMTC), ultra-reliable and low latency communications (URLLC), etc. The NR shall be inherently forward compatible. Document: SAMSUNG, "On UL Transmission Timing Aspects", vol. RAN WG1, no. Nagoya, Japan; 20170918 - 20170921, (20170912), 3GPP DRAFT; R1-1716021 UL TRANSMISSION TIMING, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, URL: http://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_AH/NR_AH_1709/Docs/, (20170912), relates to UL timing aspects in 3GPP. Document: LG ELECTRONICS, "Timing advance for TDD-FDD carrier aggregation", vol. RAN WG1, no. Prague, Czech Republic; 20140210 - 20140214, (20140209), 3GPP DRAFT; R1-140314 TA FOR TDD-FDD CA, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, URL: http://www.3gpp.org/ftp/Meetings_3GPP_SYNC/RAN/RAN1/Docs/, (20140209), relates to timing advance in 3GPP. US2011/171949 relates to a two-step uplink synchronization method for uplink synchronization between a mobile station and a pico/femto base station that is deployed together with an overlay macro/micro base station. SUMMARY It is generally expected that timing between DL signal and UL signal will be reduced, specifically for URLLC. For example, timing between downlink (DL) data and uplink (UL) hybrid automatic repeat request acknowledgement (HARQ-ACK) or timing between UL grant and UL data may be reduced, compared to timing in 3GPP LTE/LTE-A. In order to efficiently support the reduced timing between DL signal and UL signal in NR, the present invention discusses details on UL subframe/slot boundary shift. In an aspect, a method according to claim 1 is provided. In another aspect, a user equipment (UE) according to claim 8 is provided. Reduced timing between DL signal and UL signal in NR can be efficiently supported. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an example of a wireless communication system to which technical features of the present invention can be applied.FIG. 2 shows another example of a wireless communication system to which technical features of the present invention can be applied.FIG. 3 shows an example of a frame structure to which technical features of the present invention can be applied.FIG. 4 shows another example of a frame structure to which technical features of the present invention can be applied.FIG. 5 shows an example of a resource grid to which technical features of the present invention can be applied.FIG. 6 shows an example of a synchronization channel to which technical features of the present invention can be applied.FIG. 7 shows an example of a frequency allocation scheme to which technical features of the present invention can be applied.FIG. 8 shows an example of multiple BWPs to which technical features of the present invention can be applied.FIG. 9 shows an example of UL subframe/slot shift according to an embodiment of the present invention.FIG. 10 shows another example of UL subframe/slot shift according to an embodiment of the present invention.FIG. 11 shows an example of slot structure according to an embodiment of the present invention.FIG. 12 shows an example of applying TA offset according to an embodiment of the present invention.FIG. 13 shows an example of applying TA offset according to an embodiment of the pre