請教大家一個有關(guān)“MCS8->MCS6重傳失敗”的問題：最近在上海測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曾專門針對MCS8用MCS6重傳加Padding的問題提過CR修改了規(guī)范45.003、44.060（相關(guān)的3GPP CR請參見附件），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.

我們測試的終端是遵循新的Rel-4規(guī)范，而測試出問題的網(wǎng)絡(luò)協(xié)議版本是R99，不知道是否因為這個BTS沒有修改該CR且又支持上行IR合并導(dǎo)致？

謝謝。