- 专利标题: Systems and methods for closed-loop and open-loop wireless communications
-
申请号: US12025179申请日: 2008-02-04
-
公开(公告)号: US09154174B1公开(公告)日: 2015-10-06
- 发明人: Jianming Wu , Jianglei Ma , Wen Tong , Peiying Zhu
- 申请人: Jianming Wu , Jianglei Ma , Wen Tong , Peiying Zhu
- 申请人地址: US WA Redmond
- 专利权人: Microsoft Technology Licensing, LLC
- 当前专利权人: Microsoft Technology Licensing, LLC
- 当前专利权人地址: US WA Redmond
- 代理商 Brandon Roper; Judy Yee; Micky Minhas
- 主分类号: H04B1/00
- IPC分类号: H04B1/00 ; H04B1/3827
摘要:
The present invention relates to user equipment (UE) having at least two transmit antennas that are capable of transmitting RF signals to a base station, which selects either an open-loop mode or a closed-loop mode depending on how the RF signals from the UE are changing. In the closed-loop mode, the base station periodically evaluates the RF signals from the UE and selects which of the UE's transmit antennas are to be used. This information is then sent to the UE. If the base station determines that the RF signals from the UE are changing too rapidly for effective control, then the base station selects the open-loop mode, such that the UE selects which of the UE's transmit antennas are to be used.