針對你的回答，我有不同意見，PDCP是對關(guān)聯(lián)了SRB的PDCP實(shí)體進(jìn)行完整性保護(hù)，被完整性保護(hù)的數(shù)據(jù)單元包括加密前的PDU頭和數(shù)據(jù)部分。協(xié)議原文如下：

The integrity protection function includes both integrity protection and integrity verification and is performed in PDCP for PDCP entities associated with SRBs. The data unit that is integrity protected is the PDU header and the data part of the PDU before ciphering.

-integrity protection and integrity verification of control plane data;
-for RNs, integrity protection and integrity verification of user plane data;

因此，我認(rèn)為，只要有關(guān)聯(lián)SRB的PDCP實(shí)體，就有完整性保護(hù)，建立SRB就是RRC層的行為，SRB2才包括NAS層的行為，而NAS是非接入層，自然不會(huì)有PDCP實(shí)體，因此C肯定錯(cuò)。

最后，我不明白你說的SRB0不進(jìn)行完整性保護(hù)是如何得出的。還望指教，謝謝！