Method for relay selection and subchannel allocation in OFDM system

Abstract

The invention discloses a method for relay station selection and subchannel allocation in an orthogonal frequency division multiplexing multiple-access system. A relay station RS selects subchannel index numbers satisfying the channel quality requirement in a chain between a user terminal UT and the RS according to channel measurement signals so as to construct a subchannel set A; the RS sends report information to a base station BS if the maximum transmission capacity corresponding to subchannels in the subchannel set A exceeds the transmission speed requirement of the UT; the BS selects the subchannel index numbers satisfying the channel quality requirement in the chain between the RS and the BS to construct a subchannel set B; the RS is recorded as the candidacy RS if the maximum transmission capacity corresponding to subchannels in the subchannel set B exceeds the transmission speed requirement of the UT; and the target relay station selection and the subchannel allocation of the chains between the BS and the RS as well as between the RS and the UT are executed according to the subchannel set A and the subchannel set B corresponding to all RS candidates and the channel parameter corresponding to each subchannel in the A and the B. The method has the characteristic of more reasonable selection for the relay station.

Description

technical field [0001] The invention relates to the field of cellular mobile communication systems, in particular to a method for jointly realizing relay station selection and subchannel allocation in an Orthogonal Frequency Division Multiple Access (OFDMA) system. Background technique [0002] With the commercialization of 3G systems, the B3G / 4G technology with higher speed, higher spectrum efficiency, higher coverage and stronger service support capabilities has entered the standardization stage. ITU (International Telecommunication Union, International Telecommunication Union) plans to The B3G spectrum planning was completed in 2010, the main standards were completed in 2010, commercial use began in 2012, and large-scale commercial use began in 2015. B3G / 4G requires that the transmission rate can reach 1Gbps, and the required spectrum is at least 100MHz. It is difficult to find such broadband spectrum requirements in existing frequency bands, so a higher frequency band, ...

AI Technical Summary

Problems solved by technology

However, for the relay station, because it is only a part of the network infrastructure, after it completes network access and initialization, it must provide relatively stable quality of service to general users. Therefore, for user terminals that need to be relayed, in Careful consideration is required when selecting a relay station. You cannot simply rely on signal strength information to select a relay station. It requires users to enter the network through a relay node to ensure that the relay station provides relatively stable channel conditions during network operation, thereby making the entire chain The road remains stable

Images