PDCP PDU is a bit string that is bytealigned (i. e. multiple of 8 bits) in length.
一个PDCP PDU是由字节(8比特组成)队列表示长度的位串。
2
That means that words will be 4-bytealigned, halfwords will be 2-bytealigned, and bytes don't have to be aligned at all.
这意味着字将是4字节对齐的，半字将是2字节对齐的，而字节则不需要对齐。
3
The memory allocator must give you a 16-bytealigned block of space, because, in general, memory allocation must provide suitable alignment so that the memory can be used for any purpose.