Back to results
US 9,319,989 B2Granted
Method and apparatus for open loop power control
AssigneeHuawei Technologies Co., Ltd.
InventorsGong Zhang, Xun Yang, Hao Yu, Shunqing Zhang
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeHuawei Technologies Co., Ltd.
InventorsGong Zhang, Xun Yang, Hao Yu, Shunqing Zhang
Estimating the term…
The method includes: obtaining an initial power allocation ratio of an edge user, and receiving a first SINR sent by the edge user at the initial power allocation ratio; calculating a first power allocation ratio according to the first SINR, selecting a greater power allocation ratio A, and receiving a second SINR sent by the edge user at the power allocation ratio A; determining a third SINR between a first SINR value and a second SINR value; and calculating a second power allocation ratio according to the third SINR, selecting a greater power allocation ratio B, and adjusting power allocation according to the power allocation ratio. Embodiments of the present invention mainly apply to a power control process in the Co-MIMO system.
An open loop power control method, wherein in a collaborative-multiple input multiple output Co-MIMO system, a base station performs power control, and the method comprises:
A communication apparatus, comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
No references of this kind are recorded.
TPC algorithms: open loop power control
Site diversity; Macro-diversity: co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input…
Using SIR [Signal to Interference Ratio] or other wireless path parameters: taking into account channel quality metrics, e.g. SIR, SNR, CIR or Eb/lo
Using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission: power depending on the position of the…
About 6 years 4 months of term left · ends 18 Feb 2033 (estimated)
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for open loop power control.
Co-MIMO (Collaborative-Multiple Input Multiple Output, collaborative-multiple input multiple output) is a key physical layer technology of advanced international mobile communications standards. In a spatial-multiplexing cellular system, the Co-MIMO may coordinate signal transmission of multiple base stations, and the multiple base stations provide communication services for multiple mobile terminals in a manner of collaboration at the same time, thereby reducing interference between cells and improving communication performance.
In a multi-cell collaborative communication scene of the conventional power control scheme, a central control unit calculates a globally optimal power allocation ratio according to global information by adopting a suboptimal iterative algorithm, eliminates the interference between the base stations by joint optimization of collaborative scheduling and power allocation, and improves the performance of a Co-MIMO system. The inventor, however, finds that this technical solution is based on a power control scheme of the central control unit. When performing power allocation, the central control unit needs a lot of centralized calculations, which increases the complexity of the Co-MIMO system.
FIG. 1 is a flow chart of an open loop power control method according to Embodiment 1 of the present invention.
FIG. 2 is a flow chart of an open loop power control method according to Embodiment 2 of the present invention.
FIG. 3 is a first structural diagram of a communication apparatus according to Embodiment 3 of the present invention.
In the embodiments of the present invention, during implementation of power control in a Co-MIMO system, each base station performs power control independently, and dynamically adjusts power allocation of a cell center user side and a cell edge user side according to an SINR signal which is fed back by an edge user. In combination with the accompanying drawings of the embodiments of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described in the following.
An embodiment of the present invention provides an open loop power control method, and in a Co-MIMO system, each base station performs power control independently; as shown in FIG. 1, the method includes the following steps:
101: A base station obtains an initial power allocation ratio of an edge user.