Power control method and apparatus
A technology of power control and power control commands, which is applied in the field of OFDM communication systems, can solve problems such as excessive signaling overhead, inability to achieve transmission effects, and reduce data transmission rates, so as to achieve easy engineering implementation, reduce overhead, and reduce communication between cells interference effect
Inactive Publication Date: 2008-06-25
BEIJING SAMSUNG TELECOM R&D CENT +1
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Furthermore, if a user uses all subcarriers in a cell, a control command cannot achieve the ideal transmission effect
Finally, if all subcarriers of all users are controlled at any time, excessive signaling overhead is required, which will reduce the data transmission rate
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[0019] Aiming at the power control problem of OFDMA system, the present invention proposes a method based on SINR Signal Interference Noise Ratio. When the interference is 0, a hybrid power control method in the SNR (Signal Noise Ratio) decision domain is adopted. This method can be used for OFDM or OFDMA uplink and downlink. It can not only effectively reduce the overhead of control signaling, but also reduce the transmission power of the transmitter and the interference between cells.
[0020] The structural diagrams of uplink power control and downlink power control according to an example of the method of the present invention are shown in Fig. 1 (a) and (b) respectively.
[0021] In FIG. 1( a ), firstly, the mobile station (MS) sender sends data to a modulation encoder for modulation and encoding processing 100 , and then performs serial-to-parallel conversion 102 . The parallel sign bits are then power adjusted 104 according to the instructions of the power control mod...
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The invention provides a power control method, which includes the steps of presetting a signal interference noise ratio threshold (SINR thr) and a signal interference noise ratio judgment domain (SINR limit) on a receiving end, and ensuring that the difference between the threshold and the judgment domain is more than the minimum signal interference noise ration required by a system (SINR min); measuring and estimating the receiving signal interference noise ratio (SINR est), comparing the receiving signal interference noise ratio with the preset signal interference noise ratio threshold, and sending a power control instruction to an emitting end when the absolute value of the difference between the threshold and the judgment domain is more than or equal to the signal interference noise ratio judgment domain. The invention can regulate the power control signal of the signal transmitting power on a transmitting end between a base station and a mobile station in a cellular wireless communication system flexibly. On the premise of ensuring the quality of mobile communication, the invention can effectively reduce the spending of controlling the signal and the instruction and the interferences among districts. The method of the invention is applicable for uplink and downlink transmissions, and can facilitate the project implementation.
Description
technical field [0001] The invention relates to an OFDM (Orthogonal Frequency Division Multiple Orthogonal Frequency Division Multiplexing) communication system, in particular to a power control method and equipment for a broadband OFDM wireless communication system. Background technique [0002] Both IEEE 802.16d / e and WCDMA (Wideband Code Division Multiple Access) standards have adopted power control technology. For WiMAX (World Interoperability for Microwave Access (World Interoperability for Microwave Access)) or WiBro (Wireless Broadband access service) systems based on OFDMA (Orthogonal Frequency Division Multiple Access) technology, most researches on power control focus on individual cell uplinks. However, in a multi-cell network communication environment, co-channel interference between cells greatly affects system performance. For CDMA systems, power control algorithms include open-loop power control, closed-loop power control, and outer-loop power control. Espec...
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IPC IPC(8): H04B7/005
Inventor 姬翔王海林恩泽
Owner BEIJING SAMSUNG TELECOM R&D CENT