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Adaptive Femto Cell pilot power adjustment method and device

A technology of self-adaptive adjustment and pilot power, applied in power management, energy-saving ICT, sustainable buildings, etc., it can solve the problem that spectrum resources cannot meet the large-scale deployment of FemtoCell, and operators rarely own several 3G carrier frequencies at the same time. , to achieve precise power control, reduce interference, and effectively access the network

Inactive Publication Date: 2010-03-17
ZTE CORP
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Problems solved by technology

Moreover, due to the scarcity of spectrum resources, operators rarely have several 3G carrier frequencies at the same time. For example, in the WCDMA (Wideband CDMA, Wideband Code Division Multiple Access) standard, the bandwidth of a single carrier frequency is 5MHz. Give each operator 2 or 3 frequency bands. Such spectrum resources obviously do not meet the needs of large-scale deployment of Femto Cells.

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  • Adaptive Femto Cell pilot power adjustment method and device
  • Adaptive Femto Cell pilot power adjustment method and device
  • Adaptive Femto Cell pilot power adjustment method and device

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[0047] The first embodiment of the present invention, such as figure 2 As shown, a Femto Cell pilot power adaptive adjustment method includes the following steps:

[0048] Step s101, obtain the RSCP (Received Signal Code Power, received signal code power) threshold_1 of the cell edge pilot through the link budget, RSCP refers to the received power after channel despreading. The process of the link budget specifically includes: first, the radius of the femtocell and the number of indoor walls are brought into the link budget reference formula to calculate the link loss PL: PL=37+20logd+qW,

[0049] Where PL is the link loss or path fading, in dB;

[0050] d is the radius of the femtocell, in meters;

[0051] q is the number of indoor walls, which varies according to d, because in reality, the larger the radius of the femtocell, the more places where walls appear in the space, so the number of indoor walls is also larger;

[0052] W is a fixed value of 5dB;

[0053] Then, t...

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Abstract

The invention discloses an adaptive Femto Cell pilot power adjustment method and a device, which is characterized in that a new power control mechanism is adopted, after the pilot power of the femto cell is initialized, the femto cell determines the adjustment value of the pilot power according to the signal-to-noise ratio reported by home user equipment in real time and accordingly controls the pilot power, accessed to each home user equipment, of the femto cell to enable the current pilot power of the femto cell to exactly satisfy the lowest power emission signal required by the signal target of the home user equipment in the coverage area of the pilot power. The invention can realize exact power control, effectively access the home user equipment to the network besides reducing the interference level of the system, thereby increasing the capacity of the system, and farthest reduce the interference of the pilot power of the femto cell in the users in the macrocell and the interference among the femto cells under the condition of ensuring the minimum emission power required by the home users.

Description

technical field [0001] The present invention relates to the field of mobile communication technologies, and in particular to a method and device for adaptively adjusting pilot power of a Femto Cell (femtocell base station, also called a home base station or 3G access point). Background technique [0002] From the 1980s to the present, the global mobile communication system has experienced the first generation of analog cellular system, the second generation of GSM (Global System for Mobile Communications, Global System for Mobile Communications) and narrowband CDMA (Code Division Multiple Access, Code Division Multiple Access) ) digital cellular system and the third generation broadband digital cellular system based on CDMA. At present, the research on 3G LTE (3G Long Term Evolution, the long-term evolution plan of the third-generation mobile communication system) and the fourth-band mobile communication system based on OFDM (Orthogonal Frequency Division Multiplexing) is al...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/10H04W52/24
CPCH04W52/325H04W52/244Y02B60/50H04W24/02H04W84/045
Inventor 黄志强
Owner ZTE CORP
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