Relay directional configuration combined frequency division multiplexing method facing long term evolution-advanced (LTE-A)

Abstract

The invention relates to a relay directional configuration combined frequency division multiplexing method facing the long term evolution-advanced (LTE-A). According to the method, the directionality of a directional antenna is utilized to improve the spectrum efficiency of a system, and a combined frequency spectrum distribution scheme is arranged according to the direction and the angle of the relay direction antenna to reduce the same frequency interference in each cell and between cells, control mutual interference between a relay station and a honeycomb base station and improve system performance. First, an available band is divided into a center cell band and an edge section band, and interference of edge users between the cells is eliminated, then a relay technology is introduced to expand the network coverage and improve the system throughput of the cells to expand the network coverage, but meanwhile the problems of resource distribution, complex interference structure and the like are solved. The 120-degree directional antenna with the fixed azimuth angle is arranged for a relay, and interference of the relay station to macro base station service users can be controlled while the relay is introduced. According to the band division, the relay combined frequency division multiplexing method is provided, the frequency spectrum frequency is effectively improved, and the relay is controlled to be prevented from generating severe interference on the section users.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and mainly relates to spectrum allocation of a directional antenna-based relay cellular system in LTE-A. Background technique [0002] Due to the increasing shortage of spectrum resources, the system capacity, especially the system capacity at the cell edge, is greatly restricted. In order to pursue a higher transmission rate, a new network structure, that is, a multi-hop relay cellular network, is proposed. The introduction of relay technology expands the coverage area of ​​the cell, provides services for areas with severe shadow fading and dead spots in the cell, improves the throughput of users at the edge of the cell, and has lower operation and maintenance costs than base stations. The relay technology was considered to be added to the network as early as the GSM period. The early relays simply played the role of signal amplification, directly amplifying the received signal wi...

AI Technical Summary

Problems solved by technology

However, in the relay cellular network, although the introduction of the relay improves the coverage of the cell and the transmission rate of the user at the edge of the cell, it also makes the network structure more complex and brings more complex interference.

In the relay network, the coexistence of the base station and the relay not only brings interference between the relays, but also the transmission link of the relay will cause serious interference to the transmission link of the base station, thereby affecting the performance of the system, so how the spectrum Allocation becomes an important issue

[0004] At present, there are many kinds of spectrum allocation schemes for relay systems. In order to suppress the generation of relay interference, it is considered to use time division multiplexing to separate the direct link, backhaul link and access link by time slots, but this time division The multiplexing method will reduce the utilization rate of time resources and the throughput of the system; if the relay divides a part of the frequency band from the frequency resources allocated to the base station for the use of the relay, although this eliminates the interference of the relay, it will Reduce the actual available frequency resources of the system, resulting in system performance degradation; if the frequency resources of the base station and the relay are shared, it will cause serious interference and cause system performance degradation

All of the above methods are based on the configuration of omni-directional antennas on relays. Although they can effectively eliminate interference, there are obviously unreasonable resource allocations.

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