公开(公告)号：US20190149310A1

公开(公告)日：2019-05-16

申请号：US16246545

申请日：2019-01-14

Applicant: MEDIATEK INC.

Inventor： Pei-Kai Liao ,  Hua-Min Chen

IPC: H04L5/00 ,  H04W76/10 ,  H04W72/04

Abstract: A narrow band operation under a larger carrier bandwidth for new radio (NR) system is proposed. The narrow band is named as a narrow virtual carrier (VC), i.e., a wider system bandwidth comprises multiple narrower virtual carriers, and virtual carrier is UE-specific. Further, a unified indication way for VC operation under different system bandwidth (BW) & subcarrier spacing is introduced. UE receives VC configuration from eNB, which comprises an offset direction, an offset value, and a VC BW. In addition, the UE receives VC ON/OFF command from the eNB to determine the activated VCs. Multiple VCs are aggregated by the UE, and the aggregating pattern is indicated by the eNB or determined by the UE.

公开(公告)号：US20190103953A1

公开(公告)日：2019-04-04

申请号：US16145704

申请日：2018-09-28

Applicant: MEDIATEK INC.

Inventor： Pei-Kai Liao ,  Chia-Chun Hsu

IPC: H04L5/00 ,  H04W72/12 ,  H04W76/28

Abstract: Apparatus and methods are provided for efficient bandwidth adaptation for wideband carrier. In one novel aspect, the UE starts a BWP timer upon detecting one or more BWP timer starting triggering events, resets the BWP timer upon detecting BWP resetting triggering events, and switches to the default BWP upon expiration of the BWP timer. The BWP timer starting triggering events comprises decoding a command to switch away from the default BWP, the detection of end of DL data transmission in DRX mode. In another novel aspect, the UE only decodes the DCI indication for active BWP switching in the first three OFDM symbols of a subframe or a slot. In yet another novel aspect, when the SPS is configured for the serving cell for a UE with multiple BWPs, the SPS is configured for all the BWPs accordingly.

公开(公告)号：US20190029022A1

公开(公告)日：2019-01-24

申请号：US16140798

申请日：2018-09-25

Applicant: MEDIATEK Inc.

Inventor： Pei-Kai Liao ,  Chia-Chun Hsu ,  Tao Chen

IPC: H04W72/04 ,  H04W76/27 ,  H04L5/00

Abstract: Apparatus and methods are provided for virtual carrier operation in wireless systems with large carrier bandwidth. In one novel aspect, virtual carrier (VC) with a block of physically contiguous radio resources within a component carrier is configured. In one embodiment, the UE configures a downlink (DL) common virtual carrier (CVC) and an uplink (UL) CVC, which carry control information for the UE, and one or more DL/UL dedicated VCs (DVCs), which carry data services. In one embodiment, the UE obtains the CVC configuration information including the channel bandwidth and the physical location through system information. In another embodiment, the UE obtains DVC configuration through a RRC-layer signaling. In another novel aspect, the UE obtains a VC configuration switch command through either a MAC signal or a PHY signal, and subsequently reconfigures one or more configured VCs based on the received switch command.

公开(公告)号：US20180368116A1

公开(公告)日：2018-12-20

申请号：US16007156

申请日：2018-06-13

Applicant: Mediatek Inc.

Inventor： Yiju Liao ,  Chien Hwa Hwang ,  Chien-Chang Li ,  Pei-Kai Liao

IPC: H04W72/04 ,  H04L5/00 ,  H04W56/00 ,  H04W74/08 ,  H04W76/27

Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE receives a CORESET configuration specifying one or more properties of a first CORESET. The UE also determines time and frequency resource elements of the first CORESET based on the one or more properties. The UE performs blind decoding on down-link control channel candidates in a search space carried by the first CORESET to obtain a down-link control channel.

公开(公告)号：US10104691B2

公开(公告)日：2018-10-16

申请号：US15098431

申请日：2016-04-14

Applicant: MEDIATEK INC.

Inventor： Chien-Chang Li ,  Pei-Kai Liao ,  Weidong Yang ,  Bo-Si Chen

IPC: H04Q7/00 ,  H04W74/08

Abstract: A method of determining and adapting a contention window size (CWS) based on channel loading for load-based equipment (LBE) listen before talk (LBT) channel access mechanism is proposed. The historic observations obtained from carrier sensing can reflect the state of channel loading, which is then used to adapt the maximal contention window size. A wireless device collects historical channel loading information including the number of idle slots and the number of busy slots. The wireless device uses the historical information to estimate the total number of active devices M in the wireless network and the channel-loading factor. The wireless device then computes the thresholds using the long-term value of M and then adapts the value of the CWS based on the channel-loading factor and the thresholds.

公开(公告)号：US10104674B2

公开(公告)日：2018-10-16

申请号：US15341846

申请日：2016-11-02

Applicant: MEDIATEK INC.

Inventor： Chien-Hwa Hwang ,  Lung-Sheng Tsai ,  Yi-Ju Liao ,  Tsang-Wei Yu ,  Pei-Kai Liao

IPC: H04W4/00 ,  H04W72/08 ,  H04L25/02 ,  H04J11/00 ,  H04L1/00 ,  H04B7/0452 ,  H04W88/08 ,  H04W92/10

Abstract: A new air interface that is interference cancellation friendly is proposed. In one novel aspect, a novel code rate assignment with rate splitting is proposed. In one embodiment, a base station decomposes a codeword {x1} into two codewords {x1a} and {x1b}. The two codewords are applied with different code rates and/or modulation orders. More specifically, the code rate or modulation order of codeword {x1a} is set appropriately so that a victim UE can decode and cancel {x1a} under the channel quality of the victim UE. Typically, the channel quality of a victim UE is poorer than the channel quality of the intended UE. As a result, the MCS for {x1a} can be lower than the MCS for {x1b} such that the victim UE is able to apply CWIC to decode and cancel {x1a}.

公开(公告)号：US20180199344A1

公开(公告)日：2018-07-12

申请号：US15868015

申请日：2018-01-11

Applicant: MEDIATEK INC.

Inventor： Pei-Kai Liao ,  Tao Chen ,  Chien-Chang Li

IPC: H04W72/04 ,  H04W48/10 ,  H04W56/00

Abstract: In one novel aspect, a plurality of synchronization signal (SS) anchors within a block of a contiguous spectrum is configured in a wireless network, wherein each SS anchor is a primary SS anchor or a secondary SS anchor. The UE performs an initial access by detecting a first primary SS anchor and receives one or more virtual carrier configurations with corresponding SS anchors within the block of the contiguous spectrum. In another novel aspect, The UE performs an initial access through a first RF band with a first bandwidth and a first center frequency, receives a switching signal to switch from the first RF band to a second RF band with a second bandwidth and a second center frequency, wherein the second bandwidth is different from the first bandwidth, and performs a RF bandwidth adaptation from the first RF band to the second RF band based on the adaptation signal.

公开(公告)号：US20180167164A1

公开(公告)日：2018-06-14

申请号：US15835768

申请日：2017-12-08

Applicant: MEDIATEK INC.

Inventor： Hsuan-Li Lin ,  Pei-Kai Liao ,  Wei-De Wu

IPC: H04L1/00 ,  H04W72/12

CPC classification number: H04L1/0042 ,  H04L1/00 ,  H04L1/0038 ,  H04L1/08 ,  H04L1/1812 ,  H04L1/1845 ,  H04W72/1205 ,  H04W72/1289

Abstract: A method for URLLC transmission with UE blind detection on scheduling information is proposed. Since increased control channel reliability requires increased physical resource, it is proposed to exploit UE blind detection on part of the URLLC data burst to trade-off control channel reliability with reduced physical radio resource for URLLC transmission. The URLLC burst is encoded to a plurality of low-density parity-check (LDPC) code blocks (CBs), and UE blindly decodes over multiple candidate configurations of the first data CB, and then the non-signaled scheduling information and the first data CB are successfully retrieved passing CRC check, where the CRC of longer size is added to the first data CB. The proposed method leverages UE blind detection and higher layer signaling to carry part of scheduling information to reduce control channel payload, which saves physical radio resource and improves reliability.

公开(公告)号：US20180070302A1

公开(公告)日：2018-03-08

申请号：US15697423

申请日：2017-09-06

Applicant: MediaTek Inc.

Inventor： Wei-De Wu ,  Pei-Kai Liao ,  Hsuan-Li Lin ,  Shiang-Jiun Lin ,  Wei-Jen Chen ,  Li-Chuan Tseng

IPC: H04W52/02 ,  H04L5/00

CPC classification number: H04W52/028 ,  H04L5/001 ,  H04L5/0039 ,  H04L5/005 ,  H04L5/0051 ,  H04L5/0055 ,  H04W52/0216 ,  H04W52/0219 ,  H04W52/0229 ,  Y02D70/00 ,  Y02D70/10 ,  Y02D70/12 ,  Y02D70/126 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/166 ,  Y02D70/23 ,  Y02D70/24 ,  Y02D70/26

Abstract: Concepts and examples pertaining to efficient coding switching and modem resource utilization in wireless communication systems are described. A processor of a modem of a user equipment (UE), configured with at least a first-capacity decoder and at least a second-capacity decoder, receives a common virtual carrier (CVC), a dedicated virtual carrier (DVC), or both. The CVC contains common information shared by multiple UEs, control information for the UE, and/or data information related to first data destined for the UE. The DVC contains control information for the UE, the first data, or a combination thereof. The first-capacity decoder decodes data of a small size up to a low data rate. The second-capacity decoder decodes data of a large size up to a high data rate. The processor determines whether to decode the first data using the first-capacity decoder or the second-capacity decoder based on the data information in the CVC.

公开(公告)号：US20170324499A1

公开(公告)日：2017-11-09

申请号：US15657430

申请日：2017-07-24

Applicant: MEDIATEK INC.

Inventor： Pei-Kai Liao ,  Hsiao-Lan Chiang ,  Chien-Chang Li ,  Xiangyang Zhuang

IPC: H04J11/00 ,  H04L5/00 ,  H04W24/08 ,  H04L27/26 ,  H04W48/10 ,  H04W88/02 ,  H04W48/16

CPC classification number: H04J11/005 ,  H04J11/0079 ,  H04J2011/0096 ,  H04L5/0007 ,  H04L5/005 ,  H04L5/0073 ,  H04L27/2613 ,  H04W24/08 ,  H04W48/10 ,  H04W48/16 ,  H04W88/02

Abstract: A method of small cell discovery and RSRP/RSRQ measurements in OFDM/OFDMA systems is proposed. A discovery reference signal (DRS) with low transmission frequency is introduced to support small cell detection within a short time, multiple small cell discovery, and accurate measurement of multiple small cells. The DRS consists of one or multiple reference signal types with the functionalities including timing and frequency synchronization, cell detection, RSRP/RSSI/RSRQ measurements, and interference mitigation. RE muting is configured for the DRS to reduce interference level from data to DRS for discovery and RSRP/RSRQ measurements for small cells.