《《HSDPA Flow control problem description 2016-04》.ppt

Slide title 44 pt Text and bullet level 1 minimum 24 pt Bullets level 2-5 minimum 20 pt Characters for Embedded font:!#$%()*+,-./0123456789:;=?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~?￠￡¤￥|§¨?a???ˉ°±23′?·?1o???àá??????è?ìí??D?òó???×?ùú?üYT?àáa?????èéê?ìí??e?òó???÷?ùú?üyt?āā????????????ē????ěě??????īī???????????????ń???ňō????????????????????ūū?????????????????????ˇ?˙???????????–—‘’?“”????…‰???€?āā??????????????ēē????ěě??????īī?????????????????ōō????????????????ūū?????????????????≤≥?? ????????ΑΒΓΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨ???????αβγδεζηθικλνξορ?ΣΤΥΦΧΨΩ????? Ё?????????????АБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯАБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯЁ???????????????????????????????№ Do not add objects or text in the footer area HSDPA Flow control problem description 2012-04 | Ericsson Confidential | EAB/FJW-12:0403 Uen, Rev PA9 | 2012-08-21 | Page * Slide title 70 pt CAPITALS Slide subtitle minimum 30 pt HSDPA Flow controlUnwanted behavior found Martin Skarve April 2012 WCDMA System Management TN Congestion control Principles RBS RNC Iub TN RNC Iur TN The RNC receives user data and shall then feed each RBS user buffer with enough, but not too much data. -Too long, RLC may time out -Too short, gives empty TTIs Both gives reduced performance. Algorithm is in RBS and decides what rate the RNC shall send. The info is sent in Capacity Allocations (CA) to the RNC. Overview HS FC RBS Frame loss detection Iub BaseBand HS-TXM1 HS-TXM2 Flow control algorithm: Initial ramp-up, PQ (buffer) filling frame loss CA calculation CA sent ~0,4-1sec RNC DCS UEH User data is buffered and then scheduling based on CA Control FC data as: on/off per cell, timers etc User data+ CA Iups Available states (per RAB): (PQF initialization) Inactive Slow Start Congestion Avoidance HSDPA Flow ControlBehavior time CA rate 32kbps hsSsStartPoint = MIN(maxHsRate, hsSsStartPointMax, maxUuRate / #PQs, average CA in TXM) Min 400ms (wha