最近在调测一个Case，发现协议规定，SS通过发送PDCCH Order要求终端在SCELL上发随机接入（St5），在PCELL上回随机接入响应（St9）。这就让我有以下几点不懂
1）以前看的资料SCELL只是提供传输资源，不能进行随机接入。但是523协议上的步骤让我不太理解，是不是Release变化，内容也跟着变了？？？这是我自己唯一的解释
St
| Procedure
| Message Sequence
| TP
| Verdict
|
|
| U - S
| Message
|
|
|
1
| The SS transmits an RRCConnectionReconfiguration message with SCell (Cell 3) addition
| <--
| RRCConnectionReconfiguration
| -
| -
|
2
| The UE transmits an RRCConnectionReconfigurationComplete message to confirm SCell (Cell 3) addition.
| -->
| RRCConnectionReconfiguration Complete
| -
| -
|
3
| The SS transmits an Activation MAC control element to activate SCell (Cell 3).
| <--
| MAC PDU (Activation (C1=1))
| -
| -
|
4
| The SS indicates a new transmission on PDCCH of CC1
(Cell 1) and transmits a MAC PDU (containing an RLC PDU )
| <--
| MAC PDU (CC1)
| -
| -
|
5
| The SS transmits a PDCCH order providing Random Access Preamble on SCell (Cell 3)
| <--
| (PDCCH Order)
| -
| -
|
-
| EXCEPTION: In parallel with step 6 to 8, parallel behaviour defined in table 7.1.2.10.1.3.2-2 is executed
.
| -
| -
| -
| -
|
6
| Check: Does the UE transmit a preamble on PRACH
using the same preamble index as given in step 5 on SCell (Cell3)?
| -->
| (PRACH Preamble)
| 1
| P
|
7
| Check: Does the UE transmit a preamble on PRACH after ra-ResponseWindowSize using the same preamble index as given in step 5 on SCell (Cell3)?
| -->
| (PRACH Preamble)
| 3
| P
|
8
| Check: Does the UE transmit a preamble on PRACH after ra-ResponseWindowSize using the same preamble index as given in step 5 on SCell (Cell3)?
| -->
| (PRACH Preamble)
| 3
| P
|
9
| The SS transmits Random Access Response with RAPID corresponding to Preamble in step 5 on PCell (Cell 1).
| <--
| Random Access Response
| -
| -
|
10
| The SS indicates a new transmission on PDCCH of CC2
(Cell 3) and transmits a MAC PDU (containing an RLC PDU )
| <--
| MAC PDU (CC2)
| -
| -
|
11
| The SS sends an UL grant suitable for transmitting loop back PDU on Cell 3.
| <--
| (UL Grant)
| -
| -
|
12
| Check: Does the UE transmit a MAC PDU containing the loop back PDU corresponding to step 10?
| -->
| MAC PDU(CC2)
| 4, 5
| P
|
13
| The SS transmits a MAC PDU containing RLC status PDU acknowledging reception of RLC PDU in step 12
| <--
| MAC PDU (CC2)
| -
| -
|
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