Orthogonal frequency division multiplexing access system and power control method thereof

An access system and orthogonal frequency division technology, applied in the field of communication, can solve the problem of not being able to cover optional modulation and coding methods, and achieve overall high performance, spectrum utilization, and efficiency improvement

Inactive Publication Date: 2010-09-15
ZTE CORP
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a power control method and device for an OFDM access system, which solves the problem that all optional modulation and coding methods cannot be covered in the current power control method

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  • Orthogonal frequency division multiplexing access system and power control method thereof
  • Orthogonal frequency division multiplexing access system and power control method thereof
  • Orthogonal frequency division multiplexing access system and power control method thereof

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] In the current power control method based on the differential path loss power compensation algorithm, such as Figure 4 shown, including the following steps,

[0029] Step 401, the mobile terminal continuously measures the serving base station signal and the strongest interference signal, and calculates the path loss difference through formula (1);

[0030] ΔPL ( dB ) = P ( dBm ) rx , serving - P ( dBm ) rx , strongest _ neighbor + P ...

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Abstract

The invention relates to a power control method of an orthogonal frequency division multiplexing access system, comprising the following steps of: acquiring cell interference parameters, a maximum path loss difference threshold value and a minimum path loss difference threshold value sent by a service base station by a mobile terminal; determining a target signal interference noise ratio value of the mobile terminal according to the acquired cell interference parameters, the maximum path loss difference threshold value, the minimum path loss difference threshold value and base station signal path loss acquired by measurement by the mobile terminal; and selecting a modulation encoding manner by the mobile terminal according to the confirmed target signal interference noise ratio value and regulating the transmitting power thereof so as to carry out signal transmission. By applying the power control method, the problem that the current power control method can not cover all selective modulation encoding manners is solved, the power control efficiency can be improved under the condition of lesser expenses and the performance and the frequency spectrum utilization ratio of the system are further enhanced.

Description

technical field [0001] The present invention relates to the communication field, in particular to an Orthogonal Frequency Division Multiplexing Access (OFDMA, Orthogonal Frequency Division Multiplexing Access) system and a power control method thereof. Background technique [0002] In wireless communication systems, power control is an important means of transmission quality control, and its purpose is to overcome the problem of communication performance degradation caused by wireless channel fading and interference. As the wireless channel fades or the shadow changes, the base station or mobile terminal adjusts the transmit power to compensate for the impact of channel changes on the received signal quality, so power control is also a link adaptive technology. In the B3G / 4G system with OFDM (Orthogonal Frequency Division Multiplexing) as the core technology, such as LTE (Long term evolution, long-term evolution) and WiMAX (World Interoperability for Microwave Access, global...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/24H04L27/26H04L1/00
CPCH04W52/243H04W52/24H04W52/242Y02B60/50
Inventor 王军虎龚园园
Owner ZTE CORP
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