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Method and system for self adaptation of downstream bandwidth and power in orthogonal frequency division multiple address (OFDMA) network

A downlink bandwidth, adaptive technology, applied in the field of wireless communication, can solve problems such as network energy consumption and waste, achieve the effect of improving energy efficiency, reducing environmental impact, and improving flexibility

Inactive Publication Date: 2013-06-05
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the power and bandwidth allocation scheme of the current OFDMA system, resource allocation optimization is generally carried out when all cells are activated, and the shutdown of cells through further resource self-adaptation is not considered from the perspective of power consumption of the entire network. Self-adaptive, thus causing waste to the energy consumption of the network

Method used

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  • Method and system for self adaptation of downstream bandwidth and power in orthogonal frequency division multiple address (OFDMA) network
  • Method and system for self adaptation of downstream bandwidth and power in orthogonal frequency division multiple address (OFDMA) network
  • Method and system for self adaptation of downstream bandwidth and power in orthogonal frequency division multiple address (OFDMA) network

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Experimental program
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Embodiment 1

[0056] In this embodiment, two adjacent cells (cell A, cell B) with overlapping coverage are assumed, and there is only one active user in each cell, which are terminal M in cell A and terminals N and A in cell B respectively. The initial transmit power spectral densities of cells 1 and B are PSDA and PSDB respectively. This embodiment realizes the downlink bandwidth and power self-adaptive method in the OFDMA network, such as image 3 As shown, the method includes the following steps:

[0057] Step 201: Terminals M and N report the received signal level strength Rx_Power of the own cell and neighboring cells to the base stations of cells A and B respectively MA , Rx_Power MB , Rx_Power NA , Rx_Power NB and signal quality, the signal quality is represented by the ratio of carrier to interference and noise (CINR, Carrier to Interference and Noise Ratio), respectively CINR MA 、CINR MB 、CINR NA 、CINR NB ;

[0058] Step 202: The base stations of cells A and B update the s...

Embodiment 2

[0082] In this embodiment, a scenario of overlapping coverage of macro cells and micro cells is assumed. Among them, the macro cell A provides the coverage of the whole area, and the micro cell B provides the coverage of the hotspot area in the cell A, and the cells A and B have allocated the transmission bandwidth and set the effective load threshold. When the traffic in the hotspot area changes from busy time to non-busy time, the method of realizing downlink bandwidth and power adaptation in OFDMA network, such as Figure 4 As shown, the method includes the following steps:

[0083] Step 301: the base station of cell A increases the transmission bandwidth;

[0084] Step 302: the base station of cell A calculates the received signal power spectral density of the terminal in the cell according to the transmission bandwidth;

[0085] Step 303: The central control system calculates the load of the terminals under the two cells of A and B when both are served by A according to...

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Abstract

The invention discloses a method for self adaptation of downstream bandwidth and power in an orthogonal frequency division multiple address (OFDMA) network. A cell base station adjusts effective bandwidth configuration so as to enable load of a cell to be not larger than a set effective load threshold; the cell base station reports received signal power spectral density and received signal quality of the load and terminals of the cell in the cell and in an adjacent cell; a central control system determines an affiliation relation of the terminals according to reported information of the cell base station; and the cell base station determines that when all terminals in the cell are switched, a switching process is triggered, and after the terminals in the cell are switched, the cell base station is closed according to the affiliation relation. The invention further discloses a system for the self adaptation of the downstream bandwidth and the power in the OFDMA network. By means of the method and system, the flexibility of OFDMA network disturbance control can be improved, closing of a part of cells can be achieved on the basis that user experience is not affected, energy efficiency of the network is greatly improved, and effects on an environment are reduced.

Description

technical field [0001] The present invention relates to resource coordination technology in the field of wireless communication, in particular to a method and system for adaptive downlink bandwidth and power in an Orthogonal Frequency Division Multiple Access (OFDMA, Orthogonal Frequency Division Multiple Access) network. Background technique [0002] With the continuous development of wireless communication technology, the fourth-generation mobile communication system with OFDMA technology as the core gradually provides strong support for the growing demand for high-speed data services. Based on the channel characteristics of actual application scenarios and the principle of maximizing resource utilization efficiency, OFDMA technology divides the system bandwidth into mutually orthogonal subcarriers to realize the sharing of system frequency band resources among different users. In an actual system, in order to reduce system overhead and complexity and improve resource allo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/00H04W36/26
CPCY02B60/50Y02D30/70
Inventor 顾军范国田刘康康金海涛董文斌
Owner ZTE CORP