Chapter 13

Multi-flow transmission

Abstract

Multi-flow transmission, also referred to as HSDPA multi-flow data transmission, was introduced in WCDMA release 11. It enables improved user experience for cell-edge UEs located in the soft or softer handover coverage region of two cells on the same carrier frequency by allowing HS-PDSCH to be scheduled from both cells. Such operation allows more scheduling opportunities for the network, aids system load balancing, and improves cell-edge throughputs. Multi-flow operation relies on simultaneous reception of up to four HS-DSCH transport channels in the CELL_DCH state on up to two frequencies, of which a maximum of two HS-DSCH transport channels may reside at the same frequency and belong either to ...

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