公开(公告)号：US10707929B2

公开(公告)日：2020-07-07

申请号：US15756991

申请日：2015-09-10

Applicant: Apple Inc.

Inventor： Wenting Chang ,  Xu Zhang ,  Yujun Chen ,  Jiansong Tian ,  Guangjie Li ,  Ye Wu ,  Feng Zhou

IPC: H04B7/0452 ,  H04L25/02 ,  H04W28/06 ,  H04W8/00 ,  H04B7/08 ,  H04B7/0413 ,  H04L29/06 ,  H04L27/26 ,  H04W88/08

Abstract: A method of processing signals in a radio processing apparatus of a base station may include obtaining a plurality of aggregated data symbols, wherein each of the plurality of aggregated data symbols corresponds to a receive terminal of a plurality of receive terminals of the base station and is composed of transmitted data symbols from a plurality of transmit terminals; applying a compression filter to the plurality of aggregated data symbols to reduce the plurality of aggregated data symbols into a plurality of isolated data symbols, the compression filter being based on channel estimates between the plurality of receive terminals and the plurality of transmit terminals; and transmitting the plurality of isolated data symbols to a baseband processing apparatus of the base station.

公开(公告)号：US11723088B2

公开(公告)日：2023-08-08

申请号：US17869889

申请日：2022-07-21

Applicant: Apple Inc.

Inventor： Feng Yang ,  Alexander Sirotkin ,  Jaemin Han ,  Xu Zhang

IPC: H04W76/10 ,  H04W80/04 ,  H04W92/16

CPC classification number: H04W76/10 ,  H04W80/04 ,  H04W92/16

Abstract: Systems and methods of setting up an E1 interface for a gNB are described, A transmitting entity of the gNB-CU-CP and gNB-CU-UP initiates the first TNL association between the gNB-CU-CP and gNB-CU-UP, and is also limited to initiating the E1 Setup procedure. The transmitting entity sends an E1 SETUP REQUEST message to set up the E1 interface. Afterwards, a message is received from the receiving entity. The transmitting entity determines that the setup of the E1 interface is successful if the message contains IEs of an E1 SETUP RESPONSE message. The types of IEs include a message type IE and a name of the transmitting entity.

公开(公告)号：US11190989B2

公开(公告)日：2021-11-30

申请号：US16419245

申请日：2019-05-22

Applicant: Apple Inc.

Inventor： Alexander Sirotkin ,  Xu Zhang ,  Jaemin Han ,  Feng Yang ,  Honglei Miao ,  Jerome Parron ,  Markus Dominik Mueck ,  Jing Zhu ,  Ellen Liao ,  Jeongho Jeon ,  Youn Hyoung Heo ,  Anthony Lee ,  Seau S. Lim ,  Marta Martinez Tarradell ,  Meghashree Dattatri Kedalagudde ,  Puneet Jain ,  Bharat Shrestha

IPC: H04W36/00 ,  H04W36/08 ,  H04B17/318 ,  H04W80/02 ,  H04W76/27 ,  H04W80/08

Abstract: A Next Generation Node-B (gNB) and methods of communication are generally described herein. The gNB is configurable to operate as a source gNB. The gNB is configured with logical nodes including a gNB central unit (gNB-CU) and a gNB distributed unit (gNB-DU). The gNB-CU comprises a gNB-CU control plane (gNB-CU-CP) for control-plane functionality, and a gNB-CU user plane (gNB-CU-UP) for user-plane functionality. When a handover of a User Equipment (UE) from the source gNB to a target gNB is performed, the gNB transfers, from the gNB-DU to the gNB-CU-UP, a downlink data delivery status (DDDS) message to indicate that the gNB-CU-UP is to stop transfer, to the gNB-DU, of downlink data intended for the UE.

公开(公告)号：US20210176676A1

公开(公告)日：2021-06-10

申请号：US17182106

申请日：2021-02-22

Applicant: Apple Inc.

Inventor： Feng Yang ,  Min Huang ,  Alexander Sirotkin ,  Xu Zhang

IPC: H04W36/00

Abstract: Embodiments of a Next Generation Node-B (gNB) and methods of communication are disclosed herein. The gNB may be configurable to operate as a source gNB (S-gNB). The S-gNB may transfer, from a control plane (CU-CP) of the S-gNB to a CU-CP of a target gNB (T-gNB), an XnAP handover request message that indicates an Xn handover of a User Equipment (UE) from the S-gNB to the T-gNB. The S-gNB may initiate data forwarding, from a user plane (CU-UP) of the S-gNB to a CU-UP of the T-gNB, of downlink data packets. The data forwarding may be terminated based on reception of end marker packets from a user plane function (UPF) entity. The CU-UP of the S-gNB may transfer end marker packets to the CU-UP of the S-gNB to indicate termination of the data forwarding.

公开(公告)号：US11457503B2

公开(公告)日：2022-09-27

申请号：US16487173

申请日：2018-03-16

Applicant: Apple Inc.

Inventor： Jaemin Han ,  Yujian Zhang ,  Alexander Sirotkin ,  Xu Zhang ,  Yifan Yu ,  Min Huang ,  Feng Yang ,  Sudeep Palat

IPC: H04W80/02 ,  H04W76/10 ,  H04L1/18 ,  H04L69/16 ,  H04W28/06

Abstract: A centralized RAN architecture that includes lower layer transmission nodes (referred to as distributed units (DUs) herein) that connect to an upper layer RAN node (referred to as a centralized unit (CU) herein). A centralized RAN architecture may include a functional split, between the CU and DU, corresponding to the Packet Data Convergence Protocol (PDCP) and Radio Link Control (RLC) layers. In one embodiment, a CU may store copies of downlink PDCP PDUs that are transmitted to a first DU. The CU may retransmit, to a second DU, those of the PDCP PDUs which were previously transmitted to the source DU but have not been acknowledged as successfully delivered by the source DU.

公开(公告)号：US10998954B2

公开(公告)日：2021-05-04

申请号：US16494474

申请日：2017-04-07

Applicant: Apple Inc.

Inventor： Min Huang ,  Feng Yang ,  Xu Zhang

IPC: H04B7/06 ,  H04B7/0452 ,  H04B7/0456

Abstract: The disclosure relates to a radio transceiver, comprising: a precoder configured to precode a data signal for transmission to a plurality of multi-stream terminals based on a plurality of precoding weight matrices; and a processor configured to generate for each terminal in an iterative manner a precoding weight matrix and a transformed channel matrix, wherein the transformed channel matrix indicates a channel gain between the radio transceiver and the respective terminal transformed by a receive filter matrix of the respective terminal, wherein the generation of the precoding weight matrix and the transformed channel matrix in a current iteration is based on the transformed channel matrix generated from a previous iteration.