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标题: 载波聚合中的随机接入  [查看完整版帖子] [打印本页]
时间:  2015-5-20 17:00
作者: ewinda1989     标题: 载波聚合中的随机接入

载波聚合时，随机接入相关的信令都是在哪个cell上发的啊？
我看36.523协议中，我理解的是：nodeB在SCell上发preamble给UE，之后UE会在SCell上发preamble给nodeB，
然后nodeB在PCell上回RAR……

我不是很懂CA，有些疑问，难道SCell要将preamble传给PCell吗？还是PCell将RAR传给SCell啊？
这个过程是在PCell和SCell时间进行的，我有点弄不清nodeb内的过程，请高手指点

Table 7.1.2.10.1.3.2-1: Main behaviour
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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