Ref: LTE Signal Strength.
3GPP defines UE may report different types of CQI, which are "wideband CQI" and "sub-band CQI".
Which CQI type displayed in android phone?
Ref: LTE Signal Strength.
3GPP defines UE may report different types of CQI, which are "wideband CQI" and "sub-band CQI".
Which CQI type displayed in android phone?
基于Android SDK 4.3(API 18)的源代码,它使用“宽带CQI”。
CQI 在 android.telephony.SignalStrength 类中维护为单个整数。该类是其他类(即android.telephony.CellSignalStrengthLte)用来查询CQI的主类
CQI 维护为(SignalStrength.java 中的第 64 行):
private int mLteCqi;
现在根据规范,宽带 CQI 保持在 4 位,并在 PUCCH 或 PUSH 消息中发送。如果那是使用“子带 CQI”,则它还必须维护子带的信息,这些信息不能放入整数中。它通常会保存在一个向量中,如下所示:http: //my.safaribooksonline.com/book/electrical-engineering/communications-engineering/9780137033638/physical-layer-procedures-and-scheduling/ch09lev1sec2
更多确认此假设的信息,请访问:http: //lteuniversity.com/get_trained/expert_opinion1/b/hongyanlei/archive/2009/08/06/cqi-reporting-in-lte.aspx
希望有帮助。