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Orthogonal frequency division multiplexing (OFDM)-based channel assignment method in two-layer network

A channel allocation and network technology, applied in the field of communication, can solve the problems of macro base station and home base station interference, unfavorable throughput, etc., and achieve the effect of improving throughput and simple channel allocation

Active Publication Date: 2012-09-12
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the two-layer network model where macro base stations and femtocells coexist, if macro users and home users do not share spectrum, although cross-layer interference can be effectively avoided, femtocells can only use part of the spectrum, which is not conducive to the improvement of throughput
However, when the macro user and the home user share the spectrum, using the orthogonality between the subbands in the OFDM system can effectively eliminate the interference inside the macro cell and the home base station, but the home base station and the home base station, and the macro base station and the home base station are still will cause greater interference

Method used

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  • Orthogonal frequency division multiplexing (OFDM)-based channel assignment method in two-layer network
  • Orthogonal frequency division multiplexing (OFDM)-based channel assignment method in two-layer network
  • Orthogonal frequency division multiplexing (OFDM)-based channel assignment method in two-layer network

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Such as figure 2 The interference graph constructed between femtocells is shown as an undirected graph

[0070] Step 1. Adjust the initial color list allocated to each Femtocell so that the SNR of all macro users meets the threshold value, specifically:

[0071] Step 1-1 select a macro user;

[0072] Step 1-2 Calculate the SINR of the macro user γ m ,in P M，i and P k，i are respectively the transmit power of the macro base station and the femtocell k on the sub-channel i, G M，m and G k，m are the path gains from macro base station and femtocell k to macro user m, I k is the set of interfering femtocells, N 0 is the thermal noise density, B is the subchannel bandwidth;

[0073] Steps 1-3 determine the SINR of the macro user γ m Whether the threshold value SINR is met thrm ;

[0074] Steps 1-4 if¶ m thrm , then from I k Remove the most interfered home base station BS f and removed from the femtocell BS f If the color assigned to this macro user is removed ...

Embodiment 2

[0093] Such as image 3 , Figure 4 As shown, due to the randomness of the distribution of home base stations and home users, the useful power received by each home base station and the magnitude of interference are different. In order to better represent the interference of other home base stations to it, distinguish the interference size, A directed weight graph can be built to solve this problem.

[0094] An OFDM-based channel allocation method in a two-layer network, the method is based on the coexistence of a macro base station and a home base station, and a platform where the two share spectrum. Each home base station in the network corresponds to an initial color list, and each color represents a subchannel, including the following steps:

[0095] Step 1. Adjust the initial color list allocated to each Femtocell so that the SNR of all macro users meets the threshold value, specifically:

[0096] Step 1-1 select a macro user;

[0097] Step 1-2 Calculate the SINR of t...

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Abstract

The invention discloses an OFDM-based channel assignment method in a two-layer network. The method is based on coexistence of macro base stations and femtocells, the macro base stations and the femtocells share a spectral platform, each femtocell in the network corresponds to an initial color list, each color list represents a sub-channel, a sub-channel set available for each femtocell is determined on the premise of satisfaction of signal to interference plus noise ratio (SINR) requirements by macro users, and then all available frequency spectrum resources are assigned to each user dynamically according to constructed interference figures of the femtocells. The OFDM-based channel assignment method in the two-layer network reduces the interference between the macro base stations and the femtocells and among the femtocells, and simultaneously, throughput of the femtocells is improved to the greatest extent under the satisfaction of requirements of the macro users.

Description

technical field [0001] The invention relates to a channel allocation method in an OFDM-based two-layer network, belonging to the technical field of communication. Background technique [0002] In recent years, with the continuous development of mobile communication technology, the demand for high-speed data services has been increasing, and the number of users has also increased. If only relying on macro base stations, it cannot meet the service requirements of indoor users. The quality of indoor coverage is an important manifestation of the quality of mobile network service. For mobile phone users, the quality of indoor coverage has become an important factor affecting the stability of customers on the network. In order to meet the needs of indoor users and obtain higher system capacity and data rate, femtocells are slowly emerging. A Femtocell is a small, low-power base station that can be installed indoors with flexible configuration. It can effectively solve the proble...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 朱琦史菊蓉朱洪波杨龙祥
Owner NANJING UNIV OF POSTS & TELECOMM
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