附着流程关键参数

附着流程关键参数随机接入RACH接入的目的：获得上行时频资源UE发送任何数据都需要网络预先分配上行传输资源，否则无法发送上行信令/数据上行时间同步UE需要知道提前多长时间发送上行数据，才能让NB-IoT基站在预定时间收到。触发条件：NB-IoT终端在空闲态初始接入或响应寻呼连接态场景下下行数据到达，但UE上行失步（基站重同步）连接态场景下上行数据到达但无UL

grant（等效于通过RACH发送SR）与LTE的差异：不支持切换和RRC连接重建，仅支持竞争接入。随机接入基于竞争的随机接入流程图1.选覆盖等级，发RA请求UE通过SIB2获取RACH相关配置信息，根据RSRP测量结果和SIB2中携带的RSRP测量门限选择覆盖等级，在相应覆盖等级上向eNodeB发起随机接入请求。2.eNodeB发送RA响应eNodeB侧：申请分配Temporary

C-RNTI，申请上下行调度资源。在DL-SCH上发送RA响应，携带的信息有：preamble

id，TA，UL

grant，T-CRNTI。一条

DLSCH可以同时为多个UE发送RA响应。UE侧：在RA滑窗内监听NPDCCH信道获取RA响应。3.上行调度传输在RAR分配的资源上，传输上行信息，传输块大小由RAR中信息指定，固定为

88bits。初始RRC连接建立时，传输RRCCONNECTIONREQUEST，携带RRC连接建立原因，并带有NAS

UE_ID，MAC

CE，用于申请上行数据发送资源。4.eNodeB进行竞争决议竞争决议成功,基于竞争的RA流程结束。如果竞争决议定时器超时，认为此次竞争决议失败,重新进行RA尝试，直到尝试次数小于最大尝试次数。随机接入Page38随机接入Msg3携带RRC连接建立原因（mt-Access,

mo-Signalling,mo-Data,

mo-Exception-Data）的RRC建立请求，并带有UE标识；另外还会携带DVI和PHR（通过MAC

CE的方式，DVI和PHR合在一个MACCE中），用于申请上行数据发送资源（非MSG3中通过BSRMAC

CE申请，仅支持短周期BSR）。Page39RRC连接建立•UE发送携带建立原因的RRC

connection

request消息给eNodeBeNodeB为UE建立上下文如果eNodeB收到同一个UE的多次RRC

connection

request消息，则

eNodeB只处理最近一次的RRC

connection

requesteNodeB进行SRB1/SRB1bis(CP模式)资源的准入和资源分配信令连接一律准入，不做判断。如果资源分配成功，则继续后续流程。如果资源分配失败，RRC连接请 求会被拒绝。当系统过载时RRC连接请求会被拒绝。eNodeB通过向UE回复RRC

connection

reject消息拒绝UE接入。当

UE的RRC连接建立请求被拒绝后，再次发送RRC连接建立请求需等待一 定时间。eNodeB向UE回复RRC

connection

setup消息，消息中携带SRB1/SRB1bis（CP模式）资源配置的详细信息。UE根据RRC

connectionsetup消息指示的SRB1/SRB1bis资源信息，进行无线 资源配置，然后发送RRC

connection

setup

complete消息给eNodeB。eNodeB收到RRC

connection

setup

complete消息后，RRC连接建立完成。RRC连接建立流程图RRC连接建立（续）RRC

Connection

RequestRRC

Connection

SetupCP模式下引入SRB1bis承载，与SRB1的配置相同，但是没有PDCP实体创建

SRB1的同时隐含创建SRB1bisRRC连接建立（续）RRC

Connection

Setup

Complete（Attach

Request）附着流程根据23401协议描述，CP传输模式下的Attach流程与LTE的主要差别是：UE和核心网间会协商CP传输能力MME不向eNB触发上下文建立，而是通过Downlink

NAS

transfer

S1-AP消息传递Attach

Accept为了支持SMS传输，NB-IoT

UE在Attach流程时不用建立PDN连接，需要的时候再激活。附着流程附着流程（续）附着请求关键参数:New

MMES-GWP-GWeNodeBHSSOld

MME1.

AttachrequestnAS-key-identifierattach

typeESM

message

containerAdditional

update

typeUE-Network-CapabilityMS-Network-Feature-SupportSecurity

parameterPDN

typePCOUE:RRC

参数attach

requestenodeB:从RRC参数中的GUMMEI寻址MMEPage47附着请求关键参数关键参数:nAS-key-identifierNew

MMES-GW

P-GWeNodeBHSSOld

MME1.

Attachrequest如果UE没有安全上下文，那么NAS-key-identifier为111如果UE有安全上下文，那么nAS-key-identifier为0

0

0～1

10如果nAS-key-identifier

被设置，MME将使用NAS-MAC,

NAS-sequence,

NAS-key-identifier来对附着请求消息进行完整性检查。Page48附着请求关键参数关键参数:attach

typeNew

MMES-GWP-GWeNodeBHSSOld

MME1.

AttachrequestAttach

typePage49附着请求关键参数关键参数:ESM

message

containerNew

MMES-GWP-GWeNodeBHSSOld

MME1.

Attachrequest会话管理消息包含在ESM

messagecontainerActivate

dedicated

EPSbearer

context

acceptActivate

dedicated

EPSbearer

context

reject…………….Initial

attachRequest

type

Handover

EmergencyPage50附着请求关键参数关键参数:ESM

message

containerNew

MMES-GWP-GWeNodeBHSSOld

MME1.

Attachrequest会话管理消息包含在ESM

messagecontainerDevice

PropertiesLow-priorityPage51附着请求关键参数关键参数:additional

update

type，UE-Network-Capability是否优选控制面优化方案包含在additional

update

typepreferred

ciot

networkbehavior终端是否支持控制面优化方案包含在E-Network-CapabilityCp-ciotPage52附着请求关键参数New

MMES-GWP-GWeNodeBHSSOld

MME1.

Attach

request关键参数:MS-Network-Feature-Support终端是否支持扩展TAU定时器将包含在MS-Network-Feature-SupportPage53附着请求关键参数New

MMES-GWP-GWeNodeBHSSOld

MME1.

Attach

request关键参数:相关定时器T3324

：Active

TimerT3312

：Periodic

RAU

TimerPage54附着请求关键参数New

MMES-GWP-GWeNodeBHSSOld

MME1.

Attach

request关键参数:eDRXUE可以在Attach

request中请求的

eDRX寻呼周期和寻呼时长Page55Identification

Req

(MME-MME)New

MMES-GWP-GWeNodeBOld

MMEHSS3.Identification

req如果UE是新附着到MME上面的用户，则新侧MME发送一个

Identification

Request给旧侧MMEGUTITracking

Area

Identity

(RAI)Complete

Attach

RequestMessageTarget

PLMN

ID关键参数:功能：Page57Identification

Resp

(MME-MME)关键参数:New

MMES-GWP-GWeNodeBHSSOld

MMEIdentification

RespIMSIMME

UE

MM

Context

MME回复Identification

Response消息，消息中携带IMSI和安全上下文。3.Identification

resp1.

Attach

request功能:Page58IdentificationRespMM上下文信元包括移动性管理，UE安全参数等等。Picture1Picture2Page59Identity

Resp

(MME-UE)关键参数:S-GWP-GWeNodeBHSSOld

MME1.

Attach

requestIdentity

ResponseIMSI

UE回复Identity

Response消息，消息中携带IMSI。New

MME3.Identity

resp功能:3.Identity

reqPage60MME

MM承载上下文Page61Authentication

and

Integration

CheckNew

MMES-GWP-GWeNodeBOld

MME4.Authenticationreq4.Authentication

respHSSPage62Auth

Information

Req(MME->HSS)New

MMES-GWP-GWeNodeBHSSOld

MME4.Authentication

Information

Req功能:如果Attach

Request消息没有做完整性检查或者检查失败，则会发起鉴权流程。新侧MME发送

Authentication

information

req消息给HSS触发条件:MME没有UE上下文Attach

Request消息没有进行完整性校验完整性检查失败Page63Auth

InformationReq

(MME->HSS)New

MMES-GWP-GWeNodeBOld

MME4.Authentication

Information

ReqHSS关键参数:

关键参数:

IMSIIMSIRequested

E-UTRANAuthentication

InfoVisited

PLMN

IDPage64Auth

Information

Req

(MME->HSS)关键参数:Requested

E-UTRAN

Authentication

InfoRequested-EUTRAN-Authentication-Info包括：[

Number-Of-Requested-Vectors][

Immediate-Response-Preferred

]New

MMEHSS4.Authentication

SetreqPage65Auth

Resp

(HSS->MME)New

MME功能:HSS发送鉴权组给MME。4.Authentication

InfromationrespHSS关键参数:Authentication

InfoSupported

FeaturesPage66Auth

Resp

(HSS->MME)New

MME关键参数:

Authentication

Info4.Authentication

SetrespHSSAuthentication

Inforand,

autn,

xres,

kasmePage67Auth

Resp

(HSS->MME)关键参数:Supported

FeaturesNew

MME4.Authentication

SetrespHSSExample：Feature

bit

0

means

ODB-all-APNFeature

bit

1

means

ODB-HPLMN-APNFeature

bit

2

means

ODB-VPLMN-APNPage68Auth

Req/Resp

(MME-UE)New

MMEeNodeB4.Authenticationreq关键参数:Auth

ReqRandAUTNAuth

RespRES4.AuthenticationrespAuth

Req:Auth

Resq:Page69附着流程New

MMES-GWP-GWeNodeBHSSOld

MME10.

Create

session

response1.

Attach

request7.

Update

location

AckCreate

session

requestCreate

session

request2.

Identification

req/rsp3.

Identity

req/rsp11.

Create

session

responseA.B.Authentication/Security/

ME

Identity

retrievaCl.Update

location

requestCancel location

/AckD.E.Page71Update

Location

Request消息分离后，没有有效的用户上下文IMEI

变化MME

变化5.Update

LocationreqNew

MMES-GWP-GWeNodeBHSSOld

MME功能：触发条件：更新UE在HSS中的位置从HSS获取签约数据Page72ULR关键参数关键参数:HSSUser-Name:IMSITerminal

InformationSupported-featuresRAT

typeVisited

PLMN

idULR-FlagsULR

messageIMSIFeatures

supportedby

the

serving

GPRSsupport

node

(SGSN)Radio

access

technology(RAT)

type:

NB-IoT5.ULRPage73ULR关键参数Bit名称0Single-Registration-Indication1S/S6d-Indicator2Skip

Subscriber

Data3GPRS-Subscription-Data-Indicator4Node-Type-Indicator5Initial-Attach-Indicator6PS-LCS-Not-Supported-By-UE关键参数:ULR-flagPage74ULA关键参数关键参数:HSSSubscription

dataSupported-featuresResult

codeULA

消息Features

supportedby

the

HSSSubscription

dataULR

result

codeMME1.MME收到ULA消息后检查接入限制。2.如果接入限制检查成功，MME创建用户上下文。Page75附着流程New

MMES-GWP-GWeNodeBHSSOld

MME9.

Create

session

request10.

Create

session

response1.

Attach

request7.

Update

location

Ack8.

Create

session

request2.

Identification

req/rsp3.

Identity

req/rsp11.

Create

session

responseA.B.Authentication/Security/

ME

Identity

retrievaCl.Update

location

requestCancel location

/AckD.E.MME

select

SGW MME

allocate

EPSbearer

IDPage77Create

Session

Request消息功能:在S-GW和P-GW创建缺省承载触发条件NB-IoT始发附着Page78Create

Session

Req关键参数关键参数:IMSI,

MSISDNMME

TEID

for

control

planePDN

GW

addressPDN

AddressAPNradio

access

technology

(RAT)

typeDefault

EPS

Bearer

QoS.New

MMES-GW5.Create

Session

ReqPDN-typeAPN-AMBREPS

Bearer

idPCOSelection

modeCharging

characteristicsS11-U

TEID发送create

session

req

前，MME进行S-GW&P-GW选择Page79Create

Session

Req关键参数关键参数:关键参数:APN：Access

Point

NameAPN_NIAPN_OIPDN

addressPage80Create

Session

Req关键参数New

MMES-GW5.Create

Session

Req关键参数:控制面MME

TEID关键参数:PDN

GW

地址S11-U

接口MME

TEIDPage81Create

Session

Req关键参数关键参数:New

MMES-GW5.Create

Session

Req承载级QoS关键参数:RAT

typePage82Create

Session

Request消息Page

83接入的APN连接的PDN的地址类型签约数据中缺省承载的QOSCreate

Session

Response关键参数关键参数:PGW->SGW用户面PDN

GW地址用户面PDN

GW

TEID控制面PDN

GW

TEIDPDN类型,PDN地址EPS承载IDEPS

Bearer

QoSCharge

idAPN-AMBRS-GWP-GW5.Create

Session

RespPage84Create

Session

Response关键参数关键参数:SGW->MMEthe

PDN

Type,

PDN

AddressSGW用户面地址用户面Serving

GW

TEID控制面Serving

GW

TEIDEPS

Bearer

IdentityEPS

Bearer

QoSPDN

GW

地址和TEIDsNew

MMES-GW5.Create

Session

Resp用户面SGW

S1-UIP&TEID

fPGW

S5s8-UIP&TEIDPage85Create

Session

Response关键参数控制面PDN

GW地址TEID控制面SGW

地址TEID关键参数:关键参数:Page86Create

Session

Response关键参数S11用户面SGW地址TEID关键参数:Page87Create

Session

Response消息控制面PDN

GW地址和TEID隧道地址和上行用户面TEID用户面P-GW地址和TEIDQoSPage88附着流程S-GWP-GWeNodeBHSSNew

MME

Old

MME16.

Attach

complete17.

Modify

Bearer

Request

/

ResponseUplink

and

downlink

dataInitial

Context

Setup

Request

/

Attach

AcceptRRC

Connection

Reconfiguration

/

CompleteInitial

Context

Setup

ResponseDirect

TransferF.G.Page90Initial

Context

Setup

Request关键参数关键参数:MME-UE-S1AP-IDeNB-UE-S1AP-IDUE-AMBRE-RAB

to

Be

Setup

ListUE

Security

CapabilitiesAS

Security

KeyEPS

Bearer

QoS,New

MMEenodeB功能:请求enodeBs建立无线资源12.Initial

Context

Setup

RequestPage91Initial

Context

Setup

Request

关键参数关键参数:MME-UE-S1AP-IDeNB-UE-S1AP-IDNew

MMEenodeB12.Initial

Context

Setup

RequestPage92Initial

Context

Setup

Request

关键参数信元：该信元包含4个必选子E-RAB

IDE-RAB

级QoS

参数QCIARP传输层地址S1-U-SGW

IPGTP-TEIDS1-U-SGW

TEIDNAS-PDU关键参数:E-RAB

to

Be

Setup

ListPage93Initial

Context

Setup

Request

关键参数该信元包含4个必选子信元:UE

Aggregate

Maximum

Bit

Rate

DownlinkUE

Aggregate

Maximum

Bit

Rate

Uplink关键参数:UE-AMBRPage94Initial

Context

Setup

Request

关键参数关键参数:UE

SecurityCapabilities关键参数:Security

KeyPage95Initial

Context

Setup

Request信息Maximum

aggregated

bitrate

of

non-guaranteedbit

rate

(GBR)

bearersSecurity

capabilities

ofthe

US

on

the

accessstratum

(AS)Security

keyS1

bearer

andNAS

information(Attach

Accept)Pag