关于gNodeB标识长度异常导致5G无法建立的问题分析和总结

问题名称：

关于

gN odeB

标识长度异常导致

NR

添加成 功率低的问题分析和总结

现象概述：

NSA

终端驻留在

9FXYCX

新钢步 行街

(

桂花村

)1800-FDD1< /p>

锚点小区，

PCell

用

户添加

SN

成功率极低。

1

、

问题分析

①

主节点添加

SN

信令如下：

UE

MN

1. SgNB Addition Request

SN

S-GW< /p>

MME

2. SgNB Addition Request Acknowledge

3. RRCConnectionReconfiguration

4. RRCConnectionReconfigurationComplete

5. SgNB Reconfiguration Complete

6. Random Access Procedure

7. SN Status Transfer

8. Data Forwarding

Path Update procedure

11. End Marker Packet

9. E-RAB Modification Indication

10. Bearer Modication

12. E-RAB Modification Confirm

1.

The MN decides to request the SN to allocate resources for a specific E-RAB, indicating E-

RAB characteristics (E-RAB parameters, TNL address information corresponding to bearer

type). In addition, for bearers requiring SCG radio resources, MN indicates the requested SCG

configuration information, including the entire UE capabilities and the UE capability

coordination result. In this case, the MN also provides the latest measurement results for SN to

choose and configure the SCG cell(s). The MN may request the SN to allocate radio resources

for split SRB operation. The MN always provides all the needed security information to the SN

(even if no SN terminated bearers are setup) to enable SRB3 to be setup based on SN decision.

In case of bearer options that require X2-U resources between the MN and the SN, the MN

provides X2-U TNL address information for the respective E-RAB, X2-U DL TNL address

information for SN terminated bearers, X2-U UL TNL address information for MN terminated

bearers. In case of SN terminated split bearers the MN provides the maximum QoS level that it

can support. The SN may reject the request.

NOTE 1:

For split bearers, MCG and SCG resources may be requested of such an amount, that the

QoS for the respective E-RAB is guaranteed by the exact sum of resources provided by

the MCG and the SCG together, or even more. For MN terminated split bearers, the MNs

decision is reflected in step 1 by the E-RAB parameters signalled to the SN, which may

differ from E-RAB parameters received over S1.

NOTE 2:

For a specific E-RAB, the MN may request the direct establishment of an SCG or a split

bearer, i.e., without first having to establish an MCG bearer. It is also allowed that all E-

RABs can be configured as SN terminated bearers, i.e. there is no E-RAB established as

an MN terminated bearer.

②

相关指标如下：

9FXYCX

新钢步行街

(

桂花村

)1800-FDD1

几乎都添加失败。

新钢步行街

FDD--

锚点

小区内所有

LTE-NR NSA DC

的

开始时间

2020/6/13

2020/6/14

2020/6/15

PCell

用户

SgNB

增加尝试总次

数

(

无

)

5332

4969

1328

小区内所有

LTE-NR NSA DC

的

PCell

用户

SgNB