下面哪些消息携带有时间提前量（Timing Advance）字段

如题。
1. 下面哪些消息携带有时间提前量（Timing Advance）字段：（）
A、Handover Command
B、Assignment Command
C、Immediate Assignment
D、Physical Information
这题选什么，为什么

补充下，这题是多选题

答案选择D，在爱立信的小区间切换时系统会下发一个物理信息消息Physical Information，里面就有TA。我截了一张图片，但不知道如何上传，如果你是做爱立信的可以看看LOG的层三消息内切换时的Physical Information内的详细内容。

 D、Physical Information

答案是：C和D

应该是CD，但是很多题库里的答案是ACD。下面是这些信令的截图，楼主自己判断吧。


A:
Title：DL RR Handover Command
Time：18:22:20.071
Cell Description information
 NCC(PLMN colour code) : 7
 BCC(BS colour code) : 4
 BCCH_ARFCN(BCCH carriers absolute RF channel number) : 545
Channel Description 2 information
 Channel type: (1) TCH/F + FACCH/F AND SACCH/F
 TN: 7
 TSC: 4
 Hopping RF Channel: Single RF Channel
 FB-NO: DCS 1800 Band
 ARFCN: 545
Handover Reference Value:47
Power Command and Access Type Information
 PL(Power Level) : 0
 ATC(Access type control) : Sending Of Handover Access is Mandatory
Synchronization Indication information
 SI(Synchronization Indication) :  Non-synchronized.
 ROT(Report Observed Time Difference) :Mobile Time Difference IE shall not be included in the HANDOVER COMPLETE message.
 NCI(Normal cell indication) :Out of range timing advance is ignored.
Channel Mode Information:
 Mode : (33) Speech full rate or half rate version 2


B:
Title：DL RR Assignment Command
Time：18:25:42.414
Channel Description 2 information
 Channel type: (1) TCH/F + FACCH/F AND SACCH/F
 TN: 3
 TSC: 4
 Hopping RF Channel: Single RF Channel
 FB-NO: GSM 900 Band
 ARFCN: 91
Power Command Information
 Power Level: 13
Channel Mode Information:
 Mode : (33) Speech full rate or half rate version 2



C:
Title：DL RR Immediate Assignment
Time：18:25:39.366
Page Mode: (0) Normal paging.
TWO-Message Assignment(TMA) : (0) NO meaning
Downlink assignment to mobile in packet idle mode : (0) No meaning
TBF or dedicated mode (T/D) : (1) Assigns a Temporary Block Flow (TBF).
Request Reference Random Access Information (RA) : 127
 FN Modulo 42432 : 28271
 Represention : T1' = 21 T2 = 9 T3 = 17
TA: 1
Mobile allocation, after time
 Length: 0
IAX Reset Octets contains spare bits




D:
Title：DL RR Physical Information
Time：18:25:10.922
TA: 0