公开(公告)号：EP3016299A1

公开(公告)日：2016-05-04

申请号：EP15191807.5

申请日：2015-10-28

Applicant: APPLE INC.

Inventor： WANG, Xiaowen ,  MAJJIGI, Vinay R. ,  MUJTABA, Syed Aon ,  KIM, Joonsuk

IPC: H04B7/08

CPC classification number: H04B7/0877 ,  H04B7/0871 ,  H04B7/0874 ,  Y02D70/1222 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/168 ,  Y02D70/26 ,  Y02D70/444

Abstract: Wireless communication devices (UEs) may include multiple receive (RX) chains and associated antennas, and at least one transmit (TX) chain co-located with one of the RX chains. The UE may track instant fading of the antenna gain(s) during reception of packets from an associated access point (AP) device to which the UE intends to transmit packets. The UE may also track long term antenna gain(s), using any packets received at the multiple RX chains within the UE. At a switching occasion, a decision is made by the UE whether to switch antennas. If the instant fading detection is based on packets received no later than a specified time period prior to the switching occasion, then the UE may make the switching decision based on the results of the instant fading tracking. Otherwise, the UE may make the switching decision based on the results of the long term antenna gain tracking. The wireless communication devices may also evaluate signal strength during transmission of the RX packets, and/or may evaluate a possible imbalance (gain difference) between the multiple RX chains within the wireless communication device. Signal strength detection may be enabled when non-MIMO transmissions are taking place, while imbalance detection (antenna gain comparison) may be enabled when a specified number of single-stream packets have been received. Once the decision has been made to operate in a reduced number RX path mode, decision to reactivate one or more additional RX paths may be made based on MIMO detection, a detection of a drop in signal quality, and/or upon expiration of a power save timer.

Abstract translation: 无线通信设备（UE）可以包括多个接收（RX）链和相关联的天线，以及与RX链中的一个共同定位的至少一个发射（TX）链。 UE可以在接收来自UE打算发送分组的相关接入点（AP）设备的分组期间跟踪天线增益的即时衰落。 UE还可以使用在UE内的多个RX链处接收到的任何分组来跟踪长期天线增益。 在切换时刻，由UE决定是否切换天线。 如果即时衰落检测是基于在切换时刻之前的指定时间段之前接收的分组，则UE可以基于即时衰落跟踪的结果进行切换决定。 否则，UE可以基于长期天线增益跟踪的结果进行切换决定。 无线通信设备还可以评估RX分组的传输期间的信号强度，和/或可以评估无线通信设备内的多个RX链之间的可能的不平衡（增益差）。 当正在进行非MIMO传输时，可以启用信号强度检测，而当接收到指定数量的单流分组时，可以启用不平衡检测（天线增益比较）。 一旦做出了以减少数量的RX路径模式操作的决定，可以基于MIMO检测，信号质量下降检测和/或在功率失效时进行重新激活一个或多个附加RX路径的决定 保存定时器。

公开(公告)号：EP2740314A2

公开(公告)日：2014-06-11

申请号：EP12766191.6

申请日：2012-08-03

Applicant: Apple Inc.

Inventor： SONG, Kee-bong ,  WANG, Xiaowen ,  MUJTABA, Syed, Aon

IPC: H04W74/08

CPC classification number: H04W74/0833 ,  H04B17/318 ,  H04W52/146 ,  H04W52/241 ,  H04W52/367 ,  H04W52/48 ,  H04W52/50

Abstract: A mobile wireless device adapts transmit power levels and number of retransmissions of a preamble sent to a wireless network. The mobile wireless device measures characteristics of a downlink signal received from the wireless network. The mobile wireless device transmits a series of preambles to the wireless network, each successive preamble having an increased power level, starting at a power level based on the measured received signal characteristics and on parameters received from the wireless network, up to a maximum transmit power level. When the transmit power level of the preamble exceeds the maximum transmit power level and when the measured downlink signal quality falls below a threshold, the mobile wireless device limits the number of preamble retransmission to less than an allowed maximum number of retransmissions. A minimum number of retransmissions is determined and adapted to higher values for larger measured values of downlink signal quality.

Abstract translation: 移动无线设备适应发送到无线网络的前导码的发送功率电平和重传次数。 移动无线设备测量从无线网络接收的下行链路信号的特征。 移动无线设备向无线网络发送一系列前导码，每个连续的前导码具有增加的功率电平，从基于测量的接收信号特性的功率电平和从无线网络接收的参数开始，直到最大发射功率 水平。 当前导码的发射功率电平超过最大发射功率电平并且当测量的下行链路信号质量下降到阈值以下时，移动无线设备将前导码重传的数量限制为小于允许的最大重发次数。 对于下行链路信号质量的较大测量值，确定最小重传次数并将其调整为较高值。