sndcp分片重组的疑问

hycl5410

TS 44.065

6.7.3        Segmentation and reassembly in unacknowledged mode
In addition to the general procedure in subclause 6.7.1, a segment number shall be used due to the unreliable nature of the unacknowledged mode.
The Segment number is a sequence number assigned to each SN UNITDATA PDU. The sequence number shall be set to 0 in the first SN UNITDATA PDU of an N PDU, and incremented by 1 for each subsequent SN UNITDATA PDU. Modulo 16 operation is applied.
The received segments belonging to the same N PDU shall be re-ordered, if possible. If a timer (implementation dependent) elapses before all segments are received, the segments shall be discarded. Reassembly operation described in subclauses 6.7.1 and 6.7.4 shall be performed after re-ordering.

hycl5410

梦幻情缘 发表于 2013-2-19 15:01
上面没有指出时间间隔啊，而且协议上讲的重组让人看的好晕，没明白怎么什么丢弃。还有如何从丢弃状态退出 ...

(implementation dependent)就是说规范不定义，厂家自己实现咯。想知道具体的参数值和实现方法只能找厂家研发。

hycl5410

厂商。。。E,H,N...
另外电信用的是C网，没这个东西。
规范没定义的东西，包里怎么看得到呢？

hycl5410

C网是指CDMA2000/EVDO网络，可以确定这个网络没有Gb口，有没有SNDCP我不确认（应该是没有的）。

另外的一个帖子的问题实在是太细节了，抱歉我也没有研究过，所以无法帮到楼主。