根據(jù)協(xié)議3GPP TS 25.213可知，下行鏈路中P-CCPCH與P-CPICH都是利用主擾碼進(jìn)行加擾，并且是各自加擾之后進(jìn)行信道合并（這是我看協(xié)議得到的結(jié)論，如有不同的見解可以相互交流）。但是P-CCPCH在每個(gè)時(shí)隙中只發(fā)送2304個(gè)碼片。疑問點(diǎn)有兩點(diǎn)（1）協(xié)議上有這么一段話

In case of P-CCPCH, the scrambling code shall be applied aligned with the P-CCPCH frame boundary, i.e. the first complex chip of the spread P-CCPCH frame is multiplied with chip number zero of the scrambling code. In case of other downlink channels, the scrambling code shall be applied aligned with the scrambling code applied to the P‑CCPCH. In this case, the scrambling code is thus not necessarily applied aligned with the frame boundary of the physical channel to be scrambled. 這句話如何理解？P-CCPCH幀邊界指的是哪里（P-CCPCH每個(gè)時(shí)隙中前256個(gè)碼片不傳送）？其他信道進(jìn)行加擾的起始點(diǎn)與P-CCPCH一致又是如何理解？

（2）下行擾碼的長(zhǎng)度為38400，但是P-CCPCH每個(gè)時(shí)隙只有2304個(gè)碼片，根本用不了38400個(gè)擾碼序列值，是按順序依次使用，然后對(duì)于剩下的擾碼序列值擯棄不用么？