看LOG学5G(51)-PDU会话修改与接受

看LOG学5G(51)--PDU会话修改与接受\o"5G"#5G\o"PDU"#PDU一、5G(SA)网络PDU会话修改触发5G网络中当终端(UE)和网络(network)之间QOS参数发生改变时，终端(UE)或网络就会发起PDU会话的修改流程，也就是PDU会话修改通常有两种触发形式:

UE发起的PDU会话修改；

网络发起的PDU会话修改。二、PDU会话修改内容终端(UE)发起修改的PDU会话修改通过NAS消息发送，在其消息N1SM容器(PDUSessionModificationRequest)中包括:PDUsessionID,

PacketFilters,

Operation,

RequestedQoS,

Segregation,

5GSMCoreNetworkCapability;以及Number数据包过滤器、UE完整性保护最大数据速率、端口管理信息容器等消息内容。根据TS23.5015.7节中定义的QoS更改及UE和网络之间交换的QoS参数，这个PDU会话修改情况由以下几种场景触发：UE发起PDU会话修改过程中携带新QoS参数，报文过滤器（PacketFilters）。PCF发起PDU会话策略修改过程，通过SMPolicyAssociationModification通知SMF触发PDU会话修改。UDM更新用户会话签约数据，通过Nudm_SDM_Notification通知SMF。SMF本地操作触发，或者SMF发现AMF故障，修改一个PDU会话。RAN指示SMF，一个具体的QoS流资源已经释放，RAN发送N2消息到AMF，包括QFI，用户位置信息以及QoS流释放指示。三、网络侧发起PDU会话修改消息解析5G网络中无论是终端还是网络发出的PDU会话请求，正常情况下对方均会按照参数进行修改，完成后回送会话修改完成消息。

图1.无线网络中的PDU会话修改3.1

PDU会话修改命令NrnasOtaMsgInterface-MSG0>

08

000010001>

07

00000111

..enNrnasOtaMsgId:nRSM-OTA-MSG-PDU-SESSION-MOD-CMD(1800)

（NRNASOTA消息：PDU会话修改命令）2>

01

00000001

..ucUpDown:0x1(1)3>

04

00000100

..ucVersion:0x4(4)7>

00

00000000

..ulLengthASN:0x158(344)

..struMsgChoice

....struNRNAS-SM-MSG-STRU（NRNAS

SM消息结构）11>

00

00000000

......ulNasMsgSize:0x14c(332)12>

2E

00101110

......extended-protocol-discriminator:0x2e(46)13>

05

00000101

......pdu-session-identity:pDU-session-identity-value-5(5)

(PDU会话ID=5)14>

00

00000000

......procedure-transaction-identity:0x0(0)

......msg-body15>

CB

11001011T

........pDU-session-modification-command(PDU会话修改命令）18>

70

01110000L

..........authorized-qos-rules(QOS认证规则）

............qos-rule-list

..............Qos-rule19>

02

00000010

................qoS-rule-identifier:0x2(2)（QOS规则ID=2)21>

35

00110101L

................qos-rule-info22>

22

001-----

..................rule-operation-code:create-new-QoS-rule(1)

---0----

..................dqr:the-QoS-rule-is-not-the-default-QoS-rule(0)

----0010

..................number-of-packet-filters:0x2(2)(数据包过滤器)

..................create-new-QoS-rule-list

....................create-new-QoS-rule

......................Create-new-QoS-rule23>

20

00------

........................spare:0x0(0)

--10----

........................packet-filter-direction:uplink-only(2)(数据包过滤器方向-仅上行)

----0000

........................packet-filter-identifier:0x0(0)（数据包过滤器ID=0)24>

17

00010111L

........................packet-filter-contents

..........................packet-filter-contents-component

............................Packet-filter-contents-component

..............................pf-component25>

21

00100001T

................................iPv6-remote-address-prefix

(远端IPV6地址字首）......41>

03

00000011

...............................ipv6-addr:24098010500200180000000000070003

42>

80

10000000

..................................prefix-length:0x80(128)（字首长度=128)

............................Packet-filter-contents-component

..............................pf-component43>

30

00110000T

................................protocol-identifier-Next-header44>

11

00010001

..................................protocol-identifier:0x11(17)

............................Packet-filter-contents-component

..............................pf-component45>

50

01010000T

.............................single-remote-port(单一远程端口）46>

71

0111000147>

9D

10011101

..................................remote-port:0x719d(29085)（远端端口=29085）

......................Create-new-QoS-rule48>

11

00------

........................spare:0x0(0)

--01----

........................packet-filter-direction:downlink-only(1)（(数据包过滤器方向-仅下行)

----0001

........................packet-filter-identifier:0x1(1)......128>

18

00011000

..................................local-port:0x7918(31000)129>

BD

10111101

..................qoS-rule-precedence:0xbd(189)130>

02

0-------

..................spare:0x0(0)

-0------

..................segregation:not-requested(0)

--000010

..................qoS-flow-identifier:0x2(2)133>

B2

10110010L

..........mapped-EPS-bearer-contexts-list1(EPS承载与报文映射）

................eps-bearer-identity134>

70

0111----

..................epsId:0x7(7)

(EPS

ID=7)

----0000

..................spare:0x0(0)137>

52

01------

..................operation-code:create-new-EPS-bearer(1)(新增EPS承载）

--0-----

..................spare:0x0(0)

---1----

..................e-value:0x1(1)

----0010

..................number-of-EPS-parameters:0x2(2)(EPS参数列表）138>

01

00000001

......................eps-parameter-identity:mapped-EPS-QoS-parameters(1)139>

05

00000101L

......................eps-parameter-content(EPS参数内容）

........................mapped-EPS-QoS-parameters(EPS参数映射）140>

01

00000001

..........................qCI:0x1(1)（QCI=1)141>

35

00110101

..........................maximum-bit-rate-for-uplink:0x35(53)（上行最大速率53）142>

35

00110101

..........................maximum-bit-rate-for-downlink:0x35(53)（下行最大速率53）143>

35

00110101

..........................guaranteed-bit-rate-for-uplink:0x35(53)（上行保证速率53）144>

35

00110101

..........................guaranteed-bit-rate-for-downlink:0x35(53)（下行保证速率53）

....................EPS-parameters-list（EPS参数列表）145>

03

00000011

................eps-parameter-identity:traffic-flow-template(3)（EPS参数ID:TFT3)146>

A5

10100101L

......................eps-parameter-content

........................traffic-flow-template147>

24

001-----

..........................tft-operation-code:create-new-TFT(1)(TFT编码：新增TFT1)

---0----

..........................e-bit:parameters-list-is-not-included(0)

----0100

..........................number-of-packet-filters:0x4(4)

..........................packet-filter-list2

............................Create-packet-filter148>

20

00------

..............................spare:0x0(0)

--10----

..............................packet-filter-direction:uplink-only(2)

----0000

..............................packet-filter-id:0x0(0)149>

00

00000000

..............................packet-filter-evaluation-precedence:0x0(0)150>

26

00100110L

..............................packet-filter-contents

................................packet-filter-contents-component

..................................Packet-filter-contents-component

....................................pf-component......208>

03

00000011

........................................ipv6-addr:24098010500200180000000000070003

......224>

FF

11111111

........................................ipv6-addr-mask:FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF

..................................Packet-filter-contents-component

....................................pf-component225>

30

00110000T

......................................protocol-identifier-Next-header226>

11

00010001

........................................protocol-identifier:0x11(17)

..................................Packet-filter-contents-component

....................................pf-component227>

40

01000000T

......................................single-local-port228>

79

01111001229>

19

00011001

........................................local-port:0x7919(31001)

............................Create-packet-filter230>

22

00------

..............................spare:0x0(0)

--10----

..............................packet-filter-direction:uplink-only(2)

----0010

..............................packet-filter-id:0x2(2)231>

02

00000010

..............................packet-filter-evaluation-precedence:0x2(2)232>

26

00100110L

..............................packet-filter-contents

................................packet-filter-contents-component

..................................Packet-filter-contents-component

....................................pf-component233>

20

00100000T

......................................iPv6-remote-address......318>

07

00000111

......................parameter-identifier:pi-EPS-bearer-identity(7)319>

01

00000001L

......................qos-flow（QoS流）

........................ePS-bearer-identity320>

70

0111----

..........................epsId:0x7(7)（EPSID=7)

----0000

..........................spare:0x0(0)

....................Parameters-container321>

01

00000001

......................parameter-identifier:pi-5qi(1)(参数ID:PI=5QI)322>

01

00000001L

......................qos-flow323>

01

00000001

........................parameters-5qi:0x1(1)(5QI参数）

....................Parameters-container324>

02

00000010

......................parameter-identifier:pi-GFBR-uplink(2)（PI:GFBR2上行）325>

03

00000011L

......................qos-flow

........................gFBR-uplink（上行GFBR)326>

01

00000001

..........................unit:value-is-incremented-in-multiples-of-1-Kbps(1)

（多线程以1Kbps为单位增加）327>

00

00000000328>

35

00110101

..........................value:0x35(53)

....................Parameters-container329>

03

00000011

......................parameter-identifier:pi-GFBR-downlink(3)330>

03

00000011L

......................qos-flow

........................gFBR-downlink331>

01

00000001

..........................unit:value-is-incremented-in-multiples-of-1-Kbps(1)333>

35

00110101

..........................value:0x35(53)

....................Parameters-container334>

04

00000100

......................parameter-identifier:pi-MFBR-uplink(4)335>

03

00000011L

......................qos-flow

........................mFBR-uplink(mFBR上行）336>

01

00000001

..........................unit:value-is-incremented-in-multiples-of-1-Kbps(1)

（多线程以1Kbps为单位增加）337>

00

00000000338>

35

00110101

..........................value:0x35(53)

....................Parameters-container339>

05

00000101

...............