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A frequency planning method for OFDM system

An orthogonal frequency division and system frequency technology, applied in the field of communication, can solve the problems of heavy workload, few processing measures, and large impact, and achieve the effects of simple implementation, small co-frequency interference, and strong adaptability

Active Publication Date: 2008-06-04
CHINA MOBILE GROUP DESIGN INST +1
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0009] (1) Frequency planning needs to be re-planned during network expansion, which has a great impact on the network in use and a large workload;
[0010] (2) There are fewer measures to deal with capacity changes during periods of large business volume and small business volume;
[0011] (3) The characteristics of OFDMA are not fully utilized in frequency planning, and sub-channels are not planned
[0012] It can be seen that in the prior art, OFDMA system frequency planning is less adaptable to dynamic changes in coverage and capacity

Method used

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  • A frequency planning method for OFDM system
  • A frequency planning method for OFDM system
  • A frequency planning method for OFDM system

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Embodiment Construction

[0049] In order to illustrate the present invention better, at first the definition of carrier / subchannel and how to divide carrier and subchannel in OFDMA system are explained:

[0050](1) Define the carrier / subchannel:

[0051] Carrier / sub-channel = carrier × sub-channel, when the number of base stations in the cluster is N, and each base station is divided into S sectors, each sector is assigned a carrier / sub-channel, and the total number of carriers / sub-channels required is N ×S.

[0052] (2) Division of carrier and subchannel in OFDMA system:

[0053] The spectrum resources available to the system are divided into K carriers, denoted as 1, 2, ..., K, and each carrier is divided into L groups of sub-channels, denoted as 1, 2, ..., L. The division of carriers and sub-channels of spectrum resources needs to meet the following three conditions:

[0054] (a) The total carrier number K is a factor or multiple of the base station number N;

[0055] (b) The number L of subcha...

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Abstract

The invention discloses a method for planning frequency of an orthogonal frequency division multiplexing system. The method includes the following steps: (a) available spectrum resources in the orthogonal frequency division multiplexing system are divided into (number of base stations N multiplied by number of sectors per base station S) groups of carriers / sub-channels; (b) N carriers / sub-channels multiplexed in each sector in various base station are determined and priorities of the carriers / sub-channels in the corresponding sectors are determined, and the priorities of the same carriers / sub-channels in different sectors in the same base station are different; and (c) the available carriers / sub-channels are allocated in hi-low order of priority according to actual service quantity in various sectors. The method of the invention supports that multiplexing degree of the carrier / channel dynamically varies following system capacity, with the advantages of small co-channel interference and simple implementation. For the entire network, the frequency planning can be realized in one step and has stronger adaptability to the dynamic variation of coverage and capacity, and thus the network needs not to be configured once again when the service and the capacity of the network vary.

Description

technical field [0001] The invention relates to a method for frequency planning, in particular to a method for frequency planning of an Orthogonal Frequency Division Multiplexing (OFDM) system, and belongs to the technical field of communication. Background technique [0002] OFDM technology was proposed in the 1960s as a high-speed transmission technology for wireless communication systems. In recent years, with the rapid development of digital signal processing technology and integrated circuit technology, this system has been applied in various communication standards, such as IEEE 802.16 series standards, 3GPP Long-Term Evolution (Long-Term Evolution, LTE), etc. [0003] Orthogonal Frequency Division Multiple Access (OFDMA) system is a multiple access communication system based on OFDM technology. In an OFDMA system, a wireless carrier is divided into multiple mutually orthogonal subcarriers, and all available subcarriers are divided into subchannels. According to diffe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 高鹏耿学峰徐小超潘尚斌孟德香马华兴
Owner CHINA MOBILE GROUP DESIGN INST
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