請(qǐng)教大家一個(gè)有關(guān)“MCS8->MCS6重傳失敗”的問(wèn)題：最近在上海測(cè)EDGE下載速率，有大量的上行MCS8降為MCS6重傳持續(xù)失敗的現(xiàn)象，而下行MCS8->MCS6重傳都能成功，不知道啥原因。查了一下規(guī)范，看到GERAN曾專門(mén)針對(duì)MCS8用MCS6重傳加Padding的問(wèn)題提過(guò)CR修改了規(guī)范45.003、44.060（相關(guān)的3GPP CR請(qǐng)參見(jiàn)附件），從CR描述看到如下信息：
IR is mandatory in the MS and optional in the network, respectively, therefore, if this correction is not made, then in downlink for R99 onwards MS and uplink (if IR combining is used) for all network releases from R99 onwards (as R99 MS may remain in the field) either:
- it is impossible to use MCS-8 with MCS-6 retransmissions in EGPRS RLC acknowledged mode
- or failure of the data transfer occurs if EGPRS RLC acknowledged mode with MCS-8 and MCS-6 retransmissions is used.

我們測(cè)試的終端是遵循新的Rel-4規(guī)范，而測(cè)試出問(wèn)題的網(wǎng)絡(luò)協(xié)議版本是R99，不知道是否因?yàn)檫@個(gè)BTS沒(méi)有修改該CR且又支持上行IR合并導(dǎo)致？

謝謝。