【PDCP】4.5 Data available for transmission（翻译）

Ð 原文：

For the purpose of MAC buffer status reporting, the UE shall consider the following as data available for transmission in the PDCP layer: 

     For SDUs for which no PDU has been submitted to lower layers: 

     -   the SDU itself, if the SDU has not yet been processed by PDCP, or 

     -   the PDU (control or data) if the SDU has been processed by PDCP.

In addition, for radio bearers that are mapped on RLC AM, if the PDCP entity has previously received an indication from upper layer that a handover has occurred, the UE shall also consider the following as data available for transmission in the PDCP layer: 

For SDUs for which a corresponding PDU has only been submitted to lower layers before PDCP has received an indication that a handover has occurred, and for which the successful delivery has not been confirmed by lower layers or by a PDCP status report: 

     -   the SDU, if it has not yet been processed by PDCP, or 

     -   the PDU (data only) once it has been processed by PDCP.

Ð 翻译（驴头不对马嘴~）： 

为了报告MAC buffer status，UE认为以下数据在PDCP层的传输是有效的：

     对于PDU还没被送到下一层的SDU：

     - 本身还没被PDCP处理的SDU，或者

     - SDU已被PDCP处理的PDU（control或data）

另外，对于映射到RLC AM上的radio bearers，如果PDCP entity 之前收到了来自上层的handover发生的消息，UE也应该认为以下的数据传输在PDCP层是有效的：

     在PDCP收到handover发生的消息之前，对应的PDU已被送到下层，并且这次传递还未被下层或是一个PDCP status report证实成功的SDU：

     - 还未被PDCP处理的SDU，或者

     - SDU已被PDCP处理的PDU（data only）。