公开(公告)号：US20210136641A1

公开(公告)日：2021-05-06

申请号：US17034664

申请日：2020-09-28

Applicant: MediaTek Singapore Pte. Ltd.

Inventor： Abhishek Roy ,  Chia-Chun Hsu

IPC: H04W36/08 ,  H04W56/00

Abstract: This innovation describes methods for a New Radio (NR)-based, LEO Non-Terrestrial Networks (NTN) to improve handover (HO) process. As a user equipment (UE) reaches the HO region, the source and target beam-spots (satellite cells) communicate to finalize handover decision and time of handover. LEO satellites use ISL links to make the source and target cells time synchronized. After the HO decision is finalized, the source beam-spot includes this HO time in the HO Command message. Alternatively, the UE can use its location information to autonomously estimates the HO time, associated with handover events, depending on the beam diameter and speed of the LEO satellite. Under the improved handover process, HO in LEO-TNT is configured and performed without the UE explicitly performing a random access (RA) in the target cell, reducing the frequent random-access process.

公开(公告)号：US20210014339A1

公开(公告)日：2021-01-14

申请号：US16923082

申请日：2020-07-08

Applicant: MediaTek Singapore Pte. Ltd.

Inventor： Yuanyuan Zhang ,  Chun-Fan Tsai ,  Li-Chuan Tseng ,  Chia-Chun Hsu

IPC: H04L29/06 ,  H04W36/08 ,  H04W12/10

Abstract: Apparatus and methods are provided to support dual active protocol stacks (DAPS) to reduce mobility interruption time in communication system. In novel aspect, the PDCP reconfiguration includes reconfiguring a normal PDCP to a DAPS PDCP such that the DAPS PDCP is associated with both the source cell and the target cell, and reconfiguring a DAPS PDCP to the normal PDCP by releasing the association with the source cell. In one embodiment, the PDCP entity receives a PDCP reconfiguration request from upper layers of the UE configured with DAPS establishes a header compression protocol, a ciphering function, and an integrity protection function for the target cell. In one embodiment, the PDCP reconfiguration request triggers the DAPS PDCP to be normal PDCP. The DAPS PDCP releases the source header compression, ciphering and integrity protection functions.

公开(公告)号：US10805961B2

公开(公告)日：2020-10-13

申请号：US16310217

申请日：2017-11-03

Applicant: MEDIATEK SINGAPORE PTE. LTD.

Inventor： Yuanyuan Zhang ,  Chia-Hao Yu ,  Chia-Chun Hsu

IPC: H04W74/08 ,  H04B7/06 ,  H04W16/28 ,  H04W24/10 ,  H04W72/04

Abstract: Aspects of the disclosure provide a method for determination of a transmission or reception beam format in a random access process. The method can include determining, at a local entity, the Tx beam format or the Rx beam format for communication between the local entity and a remote entity during the random access process between the local entity and the remote entity in a wireless communication system employing beamforming techniques according to historical operations and channel reciprocity availability. The method can further includes transmitting or receiving, at the local entity, a random access message exchanged between the local entity and the remote entity according to the determined Tx beam format or Rx beam format, respectively.

公开(公告)号：US12127253B2

公开(公告)日：2024-10-22

申请号：US17430584

申请日：2020-02-12

Applicant: MediaTek Singapore Pte. Ltd.

Inventor： Abhishek Roy ,  Pavan Santhana Krishna Nuggehalli ,  Chia-Chun Hsu

IPC: H04W74/0816 ,  H04W72/23 ,  H04W72/566 ,  H04W74/08

CPC classification number: H04W74/0816 ,  H04W72/23 ,  H04W72/569 ,  H04W74/0866

Abstract: A method for determining Listen Before Talk (LBT) type and Channel Access Priority Class (CAPC) for signaling message transmission over signaling radio bearers (SRBs) in 5G New Radio-Unlicensed (NR-U) is proposed. A user equipment (UE) generates an SRB message to be transmitted to a serving base station over a control channel. Before the uplink (UL) transmission of an UL PDU containing the SRB message, the UE performs an LBT procedure using a set of LBT parameters associated with a CAPC value. In one embodiment, the CAPC is provided by the base station via an UL grant contained in a downlink control information (DCI). In another embodiment, the CAPC is determined by the UE based on an SRB type of the SRB message.

公开(公告)号：US20230116955A1

公开(公告)日：2023-04-20

申请号：US18046113

申请日：2022-10-12

Applicant: MediaTek Singapore Pte. Ltd.

Inventor： Yuanyuan Zhang ,  Chia-Chun Hsu

IPC: H04W28/06 ,  H04W36/00

Abstract: Apparatus and methods are provided to support uplink data compression (UDC) in NR protocol stack. In one novel aspect, UDC is performed at the transmitter side at the packet data convergence protocol (PDCP) layer before packets routing and uplink switching. At the receiver side, the receiver performs reordering before decompresses the UDC packets.
In one embodiment, transmitting UE is configured with multiple radio access technology (RAT) dual connectivity (MRDC) with a master cell group and a secondary cell group, and wherein the PDCP entity of the UE performs UDC data compression for the MRDC before routing. In another embodiment, the transmitter configures two UDC protocol stacks when a DAPS bearer is configured. The transmitting device generates UDC compressed data packets and performs UDC with the target cell configuration when UL data switching is received from lower layer.

公开(公告)号：US20230116092A1

公开(公告)日：2023-04-13

申请号：US18064237

申请日：2022-12-09

Applicant: MediaTek Singapore Pte. Ltd.

Inventor： Xuelong Wang ,  Yuanyuan Zhang ,  Per Johan Mikael Johansson ,  Pradeep Jose ,  Ming-Yuan Cheng ,  Chia-Chun Hsu

IPC: H04W76/40 ,  H04L1/1607

Abstract: Apparatus and methods are provided for reliable multicast transmission with compact protocol stack. In one novel aspect, compact protocol stacks are configured for the UE and the base station handling both the PTM RB and the PTP RB. The compact protocol stack is either configured a compact RLC entity or a compact PDCP entity. The UE monitors a PTM LCH and a PTP LCH and sends feedback to the network with the PTP RB. The base station transmits MBS data packets in the PTM mode to the one or more subscriber UE, monitors feedback report from each subscriber UEs through corresponding PTP RB, and retransmits MBS data packets to one or more UEs through corresponding PTP RBs based on corresponding feedback reports. PTM-to-PTP and PTP-to-PTM mode switches are performed when triggering events are detected. The mode switch notification is sent to UEs via MAC CE or RLC control PDU.

公开(公告)号：US11528597B2

公开(公告)日：2022-12-13

申请号：US16565699

申请日：2019-09-10

Applicant: MediaTek Singapore Pte. Ltd.

Inventor： Nathan Edward Tenny ,  Chia-Chun Hsu

IPC: H04W8/24 ,  H04W88/06 ,  H04W72/04 ,  H04B7/0456

Abstract: A method for UE capability reduction on a per-component-carrier or a per-frequency-range basis is proposed. In NR networks, UE may be operating in multiple frequency ranges (FRs) and configured with multiple component carriers (CCs) under carrier aggregation. UE can detect an overheating problem due to the RF activity supporting high bandwidth or high MIMO rank on a specific FR or a specific CC. Accordingly, UE indicates to the network a preference for a capability reduction on the specific FR or the specific CC, e.g., a reduced number of carriers, a reduced maximum bandwidth, or a reduced MIMO rank. Such per-FR or per-CC request allows UE to restrict or reduce its capability in a manner that is specific to certain component carriers and/or certain frequency ranges rather than to a global capability reduction that affects all carriers/frequencies.

公开(公告)号：US11412549B2

公开(公告)日：2022-08-09

申请号：US16829170

申请日：2020-03-25

Applicant: MediaTek Singapore Pte. Ltd.

Inventor： Abhishek Roy ,  Per Johan Mikael Johansson ,  Pradeep Jose ,  Chia-Chun Hsu ,  Pavan Santhana Krishna Nuggehalli

IPC: H04W74/08 ,  H04W36/08 ,  H04W24/10 ,  H04W76/27 ,  H04L1/18 ,  H04W36/00

Abstract: This innovation describes methods for an NR-based, LEO Non-Terrestrial Networks (NTN) to improve handover process by sending broadcast or group-cast downlink handover (HO) Command message to all (or group of) UEs in the coverage area (cell or beam-spot) of the LEO satellite. Subsequently, on receiving the broadcast (or group-cast) HO Command message, all the UEs in the source cell transmit HO Complete message to the source cell of the LEO-NTN. In order to reduce or avoid heavy Random Access (RA), generating from all the UEs, the LEO-NTN can either send Contention Free Random Access (CFRA), or instruct the UE to perform a random backoff before sending the uplink HO Complete message. Moreover, improvements to configure Conditional Handover (CHO) and delaying the transmission of HO Complete message are also provided.

公开(公告)号：US11160129B2

公开(公告)日：2021-10-26

申请号：US16319406

申请日：2016-08-12

Applicant: MediaTek Singapore Pte. Ltd.

Inventor： Yuanyuan Zhang ,  Chia-Chun Hsu ,  Chia-Hao Yu

IPC: H04W76/18 ,  H04W16/28 ,  H04W76/19 ,  H04W24/10 ,  H04W76/27 ,  H04W72/04 ,  H04W74/08 ,  H04W88/06 ,  H04B17/318

Abstract: Apparatus and methods are provided to detect radio link failure in a NR access system. In one novel aspect, the radio link failure is detected upon detection of one or more radio link failure conditions on the serving beam. In one embodiment, the physical layer problem is considered as detected when one or more predefined events occur for a number of consecutive times on the serving beam. In another embodiment, the UE further considers potential recoveries to avoid frequent triggering of the radio link failure condition. In one embodiment, the UE performs the initial alignment procedure to recover the connection. In one embodiment, UE performs the initial alignment procedure without performing radio link recovery on the serving beam. In other embodiments, the UE performs the initial alignment procedure after performing radio link recovery on the serving beam and/or selects one or more beams for initial beam alignment.

公开(公告)号：US20160315868A1

公开(公告)日：2016-10-27

申请号：US15101931

申请日：2015-01-28

Applicant: MediaTek Singapore Pte. Ltd.

Inventor： Yuanyuan Zhang ,  Per Johan Mikael Johansson ,  Chia-Chun Hsu

IPC: H04L12/801 ,  H04L12/863 ,  H04L1/18

CPC classification number: H04L47/34 ,  H04L1/1812 ,  H04L1/1841 ,  H04L1/1848 ,  H04L47/624

Abstract: Apparatus and methods are provided to reorder PDCP SDUs. In one novel aspect, a timer-based PDCP reordering process is triggered upon detecting a PDCP gap existing condition, which indicates an SN gap between the PDCP SDUs of two parallel RLC entities larger than zero. The PDCP gap-closing condition is detected when the last-delivered SDU COUNT number plus one equals to the next-expected SDU COUNT number. In one embodiment, all the stored PDCP SDUs with consecutive COUNT numbers starting from the received SDU COUNT number are delivered upon detecting the PDCP gap-closing condition. In another novel aspect, a reordering timer is started upon detecting the PDCP gap condition. In one embodiment, the expiration of the reordering timer triggers the delivery of SDUs to upper layers. In one embodiment, the UE is configured with dual connectivity and the reordering SDU COUNT numbers and the reordering timers are associated with different connectivity configured.

Abstract translation: 提供装置和方法来重新排序PDCP SDU。 在一个新颖的方面，基于定时器的PDCP重新排序过程在检测到PDCP间隙存在条件时被触发，这表示两个并行RLC实体的PDCP SDU之间的SN间隙大于零。 当最后传送的SDU COUNT号加1等于下一个预期的SDU COUNT号时，检测到PDCP间隙关闭条件。 在一个实施例中，在检测到PDCP间隙关闭条件时，传送从接收的SDU COUNT号开始的具有连续COUNT号码的所有存储的PDCP SDU。 在另一个新颖的方面，在检测到PDCP间隙条件时启动重排序定时器。 在一个实施例中，重新排序定时器的到期触发SDU到上层的传送。 在一个实施例中，UE被配置为具有双连接性并且重新排序SDU COUNT个号码，并且重新排序定时器与配置的不同连接相关联。