协议理解讨论

最新推荐文章于 2024-12-08 06:45:19 发布

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最新推荐文章于 2024-12-08 06:45:19 发布 · 426 阅读

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本文探讨了PDCP层SDU丢弃的情况，特别是在TS 38.323 5.3中提到的丢弃计时器过期或PDCP状态报告确认成功交付时的处理。作者对协议中强调丢弃对应PDCP Data PDU的部分感到困惑，并提出疑问：当SRB的PDCP SDU被丢弃时，是否应同时丢弃DRB的PDCP SDU。

PDCP 层SDU 丢弃的个人理解讨论求解

关于PDCP的功能作用已经有很多帖子在讨论了，这里只纠结一个小点，refer to TS 38.323 5.3 SDU discard
When the discardTimer expires for a PDCP SDU, or the successful delivery of a PDCP SDU is confirmed by PDCP status report, the transmitting PDCP entity shall discard the PDCP SDU along with the corresponding PDCP Data PDU. If the corresponding PDCP Data PDU has already been submitted to lower layers, the discard is indicated to lower layers.
For SRBs, when upper layers request a PDCP SDU discard, the PDCP entity shall discard all stored PDCP SDUs and PDCP PDUs.
NOTE: Discarding a PDCP SDU already associated with a PDCP SN causes a SN gap in the transmitted PDCP Data PDUs, which increases PDCP reordering delay in the receiving PDCP entity. It is up to UE implementation how to minimize SN gap after SDU discard.
其他的都很明了，这里我想和大家讨论的就是加粗的2句话。</