Wireless backhaul method of heterogeneous cellular network based on orthogonal frequency division multiple access

Abstract

The invention provides a wireless backhaul method of a heterogeneous cellular network based on orthogonal frequency division multiple access. An in-band wireless backhaul transmission signal is used as an interference signal for downlink transmission of a macro cell and uplink transmission of a small cell to improve the physical layer safety performance of the heterogeneous cellular network. In adouble-layer heterogeneous cellular network model, the small cell is deployed on the macro cell and shares a system access frequency band resource with the macro cell. According to the orthogonal frequency division multiple access scheme, multi-user access can be realized; total resources (time and bandwidth) are segmented on the aspect of frequency; the large-scale MIMO macro cell base station and the single-antenna small cell base station work in an in-band-full duplex backhaul mode. A small base station is connected to a core network through a macro base station, the macro base station provides a wireless backhaul to be connected to the small base station, all transmissions on the macro base station and the small base station are executed on the same time-frequency resource, and the scheme can well solve the wireless backhaul problem of a heterogeneous cellular network.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a wireless backhaul method of a heterogeneous cellular network based on an orthogonal frequency division multiple access technology. Background technique [0002] Driven by the rapid growth of new applications and wireless communications, the market demand for network performance is increasing, requiring that next-generation networks should support higher system capacity than current-generation networks, so fifth-generation (5G) communication systems have become an academic field. Hot spots of concern. [0003] Among the many technologies of the 5G network, massive multiple-input multiple-output (MIMO), heterogeneous cellular network (HCN) and full-duplex (FD) are considered to be three key technologies with great potential. The large-scale multi-user multiple-input multiple-output transmission mechanism greatly improves the degree of freedom of the system by config...

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Problems solved by technology

[0005] Therefore, the effective combination of full-duplex technology, massive MIMO technology, heterogeneous cellular network and OFDMA can give full play to their respective advantages and greatly improve system performance. However, with the large-scale deployment of small cell networks , a large amount of backhaul data needs to be fed back to the core network, and the backhaul problem becomes increasingly important. Although traditional wired backhaul links have high reliability at high data rates, it is impractical and costly to make wired connections between all small cells. higher

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