公开(公告)号：US11206592B2

公开(公告)日：2021-12-21

申请号：US16848383

申请日：2020-04-14

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Hyun Seo Park ,  Yun Joo Kim ,  Eunkyung Kim ,  Tae Joong Kim ,  An Seok Lee ,  Yu Ro Lee ,  Sung Cheol Chang

IPC: H04W36/08 ,  H04W76/12 ,  H04L1/16 ,  H04W8/08 ,  H04W48/16 ,  H04W80/10

Abstract: An operation method of a terminal performing handover in a mobile communication system may comprise transmitting packet data convergence protocol (PDCP) downlink reception status information of the terminal and information on a target base station to a source base station; receiving downlink data from a user plane function (UPF) via the source base station based on a first tunnel configured between the source base station and the UPF; receiving downlink data from the UPF via the target base station based on a second tunnel configured by the UPF between the target base station and the UPF by using the PDCP downlink reception status information and the information on the target base station, which are transferred from the source base station; and discarding duplicated-received protocol data units (PDUs) from the source base station and the target base station, and reordering remaining PDUs.

公开(公告)号：US10999035B2

公开(公告)日：2021-05-04

申请号：US16204212

申请日：2018-11-29

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Heesoo Lee ,  Eun Kyung Kim ,  Tae Joong Kim ,  Hyun Seo Park ,  An Seok Lee ,  Yu Ro Lee ,  Hyun Lee

IPC: H04L5/00 ,  H04B7/0413 ,  H04B17/336 ,  H04W72/04

Abstract: An operation method of a terminal in a non-orthogonal multiple access (NOMA) based communication system includes receiving information on a NOMA resource sequence allocated by a base station from the base station; and transmitting data to the base station by using a NOMA resource indicated by the information on the NOMA resource sequence in each data symbol or each data symbol group. Also, the NOMA resource sequence may indicate at least one NOMA resource in a NOMA resource set.

公开(公告)号：US10931336B2

公开(公告)日：2021-02-23

申请号：US16440641

申请日：2019-06-13

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Yu Ro Lee ,  Jae Woo Park ,  Jae Seung Lee ,  Jee Yon Choi ,  Il Gyu Kim ,  Seung Chan Bang

IPC: H04L5/14 ,  H04W84/18 ,  H04B7/0452 ,  H04W72/04 ,  H04L5/00 ,  H04B7/06 ,  H04W84/12

Abstract: A wireless communication method and apparatus in a wireless local area network (WLAN) system are disclosed. A wireless communication method according to one embodiment may include generating a high-efficiency Wi-Fi (HEW) frame including at least one of an HEW-SIG-A field and an HEW-SIG-B field which include channel information for communications according to an Orthogonal Frequency-Division Multiple Access (OFDMA) mode, and transmitting the generated HEW frame to a reception apparatus.

公开(公告)号：US10419173B2

公开(公告)日：2019-09-17

申请号：US15360442

申请日：2016-11-23

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Yu Ro Lee ,  Kwang Jae Lim ,  Sung Cheol Chang

IPC: H04L5/00 ,  H04W72/04 ,  H04W72/12 ,  H04B1/713

Abstract: Disclosed herein are a method and an apparatus for transmitting an uplink signal. The method for transmitting an uplink signal includes: transmitting an uplink data in at least one symbol included in a short transmit time interval (sTTI) including 7 symbols or less; and transmitting a demodulation reference signal (DMRS) for the uplink data through an even-numbered subcarrier or an odd-numbered subcarrier in one symbol in which the uplink data is not transmitted, among the symbols included in the sTTI.

公开(公告)号：US10367549B2

公开(公告)日：2019-07-30

申请号：US14868908

申请日：2015-09-29

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Yu Ro Lee ,  Jae Woo Park ,  Jae Seung Lee ,  Jee Yon Choi ,  Il Gyu Kim ,  Seung Chan Bang

IPC: H04L12/24 ,  H04L5/14 ,  H04L29/06 ,  H04L1/00 ,  H04B7/0452 ,  H04W72/04 ,  H04B7/06 ,  H04L5/00 ,  H04W84/12

Abstract: A wireless communication method and apparatus in a wireless local area network (WLAN) system are disclosed. A wireless communication method according to one embodiment may include generating a high-efficiency Wi-Fi (HEW) frame including at least one of an HEW-SIG-A field and an HEW-SIG-B field which include channel information for communications according to an Orthogonal Frequency-Division Multiple Access (OFDMA) mode, and transmitting the generated HEW frame to a reception apparatus.

公开(公告)号：US10321477B2

公开(公告)日：2019-06-11

申请号：US15257271

申请日：2016-09-06

Applicant: Electronics and Telecommunications Research Institute

Inventor： Kwang Jae Lim ,  Yu Ro Lee

IPC: H04W72/04 ,  H04W72/12

Abstract: Provided are a method and an apparatus for requesting uplink persistent scheduling in a mobile communication system. A terminal generates a semi-persistent scheduling (SPS) buffer status report (BSR) including a size of data and further including at least one of an SPS transmission point in time and an SPS period after configuring SPS between the terminal and a base station, and requests SPS allocation while transmitting the SPS BSR to the base station. The size of the data indicates a size of data that are to be transmitted per SPS period.

公开(公告)号：US10237753B2

公开(公告)日：2019-03-19

申请号：US14817259

申请日：2015-08-04

Applicant: Electronics and Telecommunications Research Institute

Inventor： Yu Ro Lee ,  Jae Woo Park ,  Jae Seung Lee ,  Jee Yon Choi ,  Il Gyu Kim ,  Seung Chan Bang

IPC: H04W16/28 ,  H04B7/06 ,  H04W72/04 ,  H04W72/08

Abstract: Disclosed are a frame transmission method using a selective beamforming and a communication apparatus to perform the frame transmission method. The communication apparatus may determine a beamforming matrix based on classification information in which a plurality of subcarriers used for communication is classified into a plurality of frequency units, may map a long training field (LTF) sequence to the beamforming matrix, and transmit a beamforming training (BF-T) frame including the mapped LTF sequence to a plurality of stations, may receive, from the plurality of stations having receiving the BF-T frame, feedback information generated based on a reception strength of the BF-T frame, and may allocate frequency units to data frames to be transmitted to the plurality of stations based on the feedback information, and transmit the data frames using the allocated frequency units. The reception strength of the BF-T frame may be determined at each station for each frequency unit.

公开(公告)号：US10064110B2

公开(公告)日：2018-08-28

申请号：US15343942

申请日：2016-11-04

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Won-Ik Kim ,  Seokki Kim ,  Taegyun Noh ,  Yu Ro Lee ,  Kwang Jae Lim ,  Sung Cheol Chang ,  Soojung Jung ,  Seungkwon Cho

IPC: H04L5/00 ,  H04W36/00 ,  H04W74/00 ,  H04W74/08 ,  H04L29/08

CPC classification number: H04W36/0077 ,  H04L5/0055 ,  H04L69/324 ,  H04W74/006 ,  H04W74/0833

Abstract: A terminal executes a random access procedure with a target base station depending on a pre-random access channel (pre-RACH) command in a handover preparation step executed between a source base station currently accessed by the terminal and the target base station when the terminal receives the pre-RACH command from the source base station through layer2 (L2) signaling in the handover preparation step.