This paper proposes the multi-connection realization schemes in multi-band wireless communication system

including the virtual multi-connection and multi-band multi-connection modes. The latter is further divided into two scenarios

which are multi-service multi-connection and single-service multi-connection. Specifically

the realization schemes of different multi-connection modes are analyzed and compared in terms of the data flow

scheduler

HARQ process and frequency handover techniques. The conclusions are drawn at the end of the paper.