公开(公告)号：US07013146B2

公开(公告)日：2006-03-14

申请号：US10481981

申请日：2001-06-27

Applicant: Yan Wang ,  Suli Zhao ,  Hao Guan

Inventor： Yan Wang ,  Suli Zhao ,  Hao Guan

IPC: H04Q7/20

CPC classification number: H04W74/008 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0015 ,  H04L1/0025 ,  H04W40/00 ,  H04W52/262 ,  H04W52/36 ,  H04W52/48 ,  H04W52/50 ,  H04W74/0833

Abstract: The present invention provides a method to enhance the RACH message transmission of a wireless communication systems. Therefore the known RACH procedure for uplink transmission is extended by additional steps in order to allow the usage of adaptive transmission parameters for uplink transmissions, preferably the usage of adaptive modulation and coding (AMC). This is advantageous because studies in high-speed downlink packet access show the possibility to increase the data rate of a downlink shared channel. The method according to the invention introduces a new RACH message preamble and enables the base station to estimate suitable adaptive transmission parameters like an AMC setting according to the current transmission conditions which are used during the RACH message transmission.

Abstract translation: 本发明提供一种增强无线通信系统的RACH消息传输的方法。 因此，用于上行链路传输的已知的RACH过程通过附加步骤来扩展，以便允许使用用于上行链路传输的自适应传输参数，优选地使用自适应调制和编码（AMC）。 这是有利的，因为在高速下行链路分组接入中的研究表明提高下行链路共享信道的数据速率的可能性。 根据本发明的方法引入了新的RACH消息前同步码，并且使得基站能够根据在RACH消息传输期间使用的当前传输条件来估计合适的自适应传输参数，如AMC设置。

公开(公告)号：US08982836B2

公开(公告)日：2015-03-17

申请号：US13275076

申请日：2011-10-17

Applicant: Suli Zhao ,  Ajith T. Payyappilly ,  Shrawan K. Khatri ,  Siddharth D. Chitnis

Inventor： Suli Zhao ,  Ajith T. Payyappilly ,  Shrawan K. Khatri ,  Siddharth D. Chitnis

IPC: H04W4/00 ,  H04W36/00 ,  H04W76/06

CPC classification number: H04W36/0011 ,  H04W76/30

Abstract: A method for maintaining IP context during an inter RAT handover of a UE between an eHRPD network and an LTE network may include delaying a transfer of an Internet Protocol context for at least one active packet data network until an IP address for an attach (PDN) Packet Data Network has been assigned and in the case where the Internet Protocol address for the Attach Packet Data Network is not assigned, initiating a detach operation from the LTE network without the user equipment losing the Internet Protocol context of the at least one active Packet Data Network.

Abstract translation: 在UE在eHRPD网络和LTE网络之间的RAT间切换期间维护IP上下文的方法可以包括延迟用于至少一个活动分组数据网络的因特网协议上下文的传输，直到用于附着（PDN）的IP地址为止， 已经分配了分组数据网络，并且在未分配用于附接分组数据网络的因特网协议地址的情况下，从LTE网络发起分离操作，而用户设备丢失了至少一个活动分组数据的因特网协议上下文 网络。