在5G NR討論中,有人覺得PSCell這個名字不合適,因為PSCell幾乎99%都是做PCell的功能,但是歸屬上還是屬於SCell,變成有些不適用於PSCell的SCell功能,需要另外指出【for SCells except PSCell】之類的用語,但是又不想改動SPEC太多,所以想把PSCell從SCell類別獨立出來另立門戶,所以改叫【PSCell】〔咦,怎麼還是一樣?〕但是是【Primary SCG Cell】的縮寫。目前,還在討論中,讓我們繼續看下去吧〔這樣我才可以寫下集〕。
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在上一篇【PSCell & SpCell 傻傻分不清楚?】中提到PSCell在LTE代表Primary Secondary Cell,但在5G NR可能是代表不同的意思。在RAN2#101會議中,同意將Primary Secondary SCell 改成 Primary SCG SCell[1]。功能上來說,NR PSCell還是維持LTE PSCell的角色;不同的地方是PSCell不再屬於SCell[2],所以在SPEC撰寫上,如果要同時描述PSCell和SCell,就需要明確寫出【PSCell and SCell】或【PSCell/SCell】。
有關LTE的PSCell定義如下:
36.331
Primary Secondary Cell: The SCG cell in which the UE is instructed to perform random access or initial PUSCH transmission if random access procedure is skipped when performing the SCG change procedure.
PSCell Primary Secondary Cell
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有關NR的PSCell定義如下:
38.331
Primary SCG Cell: For dual connectivity operation, the SCG cell in which the UE performs random access when performing the Reconfiguration with Sync procedure.
PSCell Primary SCG Cell
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[1] R2-1804057 Definitions for PSCell/Pcell/SpCell (38331 RIL F008) Ericsson
[2] R2-1801665 Offline discussion PSCell/Scell terminology in NR Ericsson