与缺省的EPS承载不同，专有EPS承载的建立，是为了满足用户特定QoS的需求。EPS专有承载建立之前，必须存在相应的缺省EPS承载。
EPS专有承载的建立，可以由网络侧来发起，也可以由终端侧来发起。在网络侧发起的专有承载建立过程中，专有承载建立的信令流程由网络侧发起，不要求UE上的应用层了解EPS承载层QoS的具体信息，UE上的应用层可以通过应用层的信令与网络协商QoS的相关信息，如SIP/SDP,RTSP等，但这种应用层的QoS协商并不包含承载层QoS的内容。在UE侧发起的EPS专有承载的建立中（也称为承载资源分配过程），UE上的应用层直接向网络侧提出承载层QoS（包括QCI，GBR等）的申请，如果网络侧接受UE的请求，就会与UE进一步信令交互，建立专有的EPS Bearer。
在网络侧发起的EPS专有承载的建立过程中，触发网络侧建立专有承载的条件可以是来自网络的应用层信令，也可以是来自UE的应用层信令。例如，UE发起基于IMS的VoIP呼叫或者UE需要接收基于IMS的VoIP呼叫。
下图是在基于GTP的S5接口下，网络侧发起的EPS专有承载的建立流程。
首先，PCRF根据UE应用层所需要的QoS信息，生成相应的QoS准则，通过基于Diameter的RAR（Re－AuthenticationRequest）命令发送给PGW。
PGW根据相应的QoS准则来配置EPS Bearer的QoS，并发送Create BearerRequest 消息给SGW， SGW将相应的消息转发给MME，SGW与MME之间的信息示例如下：
GPRS Tunneling Protocol V2
Create Bearer Request
Flags:72
010. .... = Version: 2
.... 1... = T: 1
MessageType: Create Bearer Request (95)
MessageLength: 743
TunnelEndpoint Identifier: 3300033 (MME的GTP －C的TEID 值)
SequenceNumber: 0
Spare:256
LinkedEPS Bearer ID (LBI) :
IE Type: EPS Bearer ID (EBI) (73)
IE Length: 1
000. .... = CR flag: 0
.... 0000 = Instance: 0
.... 0101 = EPS Bearer ID (EBI): 5
BearerContext : [Grouped IE]
IE Type: Bearer Context (93)
IE Length: 69
000. .... = CR flag: 0
.... 0000 = Instance: 0
EPS Bearer ID (EBI) :
IE Type: EPS Bearer ID (EBI) (73)
IE Length: 1
000. .... = CR flag: 0
.... 0000 = Instance: 0
.... 0000 = EPS Bearer ID (EBI): 0（EBI是由MME分配的，由于此时并没有分配，所以设置为零）
Fully Qualified Tunnel Endpoint Identifier (F-TEID) :
IE Type: Fully Qualified Tunnel Endpoint Identifier (F-TEID)(87)
IE Length: 9
000. .... = CR flag: 0
.... 0000 = Instance: 0
1... .... = V4 (True-IPV4 address field Exists,False-Doesn't Existin F-TEID): True
.0.. .... = V6(True-IPV6 address field Exists,False-Doesn't Existin F-TEID): False
...0 0001 = Interface Type: S1-U SGW GTP-U interface (1)
TEID/GRE Key: 34
F-TEID IPv4: 30.0.2.1 (30.0.2.1)
Fully Qualified Tunnel Endpoint Identifier (F-TEID) :
IE Type: Fully Qualified Tunnel Endpoint Identifier (F-TEID)(87)
IE Length: 9
000..... = CR flag: 0
.... 0001 = Instance: 1
1... .... = V4 (True-IPV4 address field Exists,False-Doesn't Existin F-TEID): True
.0.. .... = V6(True-IPV6 address field Exists,False-Doesn't Existin F-TEID): False
...0 0101 = Interface Type: S5/S8 PGW GTP-U interface (5)
TEID/GRE Key: 34
F-TEID IPv4: 20.0.0.1 (20.0.0.1)
EPS Bearer Level Traffic Flow Template (Bearer TFT) :
IE Type: EPS Bearer Level Traffic Flow Template (Bearer TFT)(84)
IE Length: 8
000. .... = CR flag: 0
.... 0000 = Instance: 0
001. .... = Operation Code: Create New TFT (1)
.... 0001 = Number of Packet Filters: 1
...0 .... = Ebit: False
Packet Filter 1
.... 0000 = Packet Filter Identifier: 0
..11 .... = Direction: bidirectional (3) (上行和下行双向的Filter)
Evaluation Precedence: 0
Length of Packet Filter: 3
Component Type: Single remote port type (80)
Single remote port type: 80
Bearer Level Quality of Service (Bearer QoS) :
IE Type: Bearer Level Quality of Service (Bearer QoS) (80)
IE Length: 22
000. .... = CR flag: 0
.... 0000 = Instance: 0
.... ...1 = PVI (Pre-emption Vulnerability): True
..00 00.. = PL (Priority Level): 0
.0.. .... = PCI (Pre-emption Capability): False（PVI，PL，以及是ARP的属性，具体内容参见3GPP 23.401）
Label (QCI): 9
Maximum Bit Rate For Uplink: 65535000
Maximum Bit Rate For Downlink: 65535000
Guaranteed Bit Rate For Uplink: 65535000
Guaranteed Bit Rate For Downlink: 65535000
MME为每个EPS Bearer分配相应的EBI （EPS Bearer ID），构造相应的 ActivateDedicated EPS Bear消息，将其作为NAS PDU，包含在发送到eNodeB的Bear Setup Request消息中。
eNodeB将EPSBearer的QoS映射到空口上的QoS，然后通过向UE发送RRCConnectionReconfiguration消息来建立相应的DRB，并对DRB进行PDCP层，逻辑层，以及RLC层等进行配置。在消息中还作为NASPDU传输来自MME的Activate Dedicated EPS Bear。在NAS PDU中，LBI （Linked EPSBear ID）给出了与Dedicated EPS Bearer对应的Default EPS Bear的标识，TFT表示应用到UE的上行TFT，其中的Precedence指出了PacketFilter的优先级，数值越低，表示优先级越高。UE在发送上行数据包的时候，按照PacketFilter的优先级对数据包进行匹配，如果匹配成功， UE就会在相应的EPS Bearer（RadioBearer）上发送数据，否则的话， UE会在缺省的EPS Bearer上发送数据。
+-Rrc
| \-Dcch [Union]
| +-message_
| \-c1 [Union]
| \-rrcConnectionReconfiguration [Union]
| +-rrc_TransactionIdentifier=0 [INTEGER]
| +-criticalExtensions
| \-c1 [Union]
| \-rrcConnectionReconfiguration_r8 [Union]
| +-measConfig=omit
| +-mobilityControlInfo=omit
| +-dedicatedInfoNASList=omit
| +-radioResourceConfigDedicated
| | +-srb_ToAddModList=omit
| | +-drb_ToAddModList [RecordOf]
| | | [0]
| | | +-eps_BearerIdentity=6 [INTEGER]
| | | +-drb_Identity=2 [INTEGER]
| | | +-pdcp_Config
| | | |+-discardTimer=infinity_ [ENUM]
| | | |+-rlc_AM
| | | | |+-statusReportRequired=true [BOOLEAN]
| | | |+-rlc_UM=omit
| | | |+-headerCompression
| | | | \-notUsed [Union]=NULL
| | | +-rlc_Config
| | | | \-am[Union]
| | | | +-ul_AM_RLC
| | | | | +-t_PollRetransmit=ms80[ENUM]
| | | | | +-pollPDU=p128 [ENUM]
| | | | | +-pollByte=kB125 [ENUM]
| | | | | +-maxRetxThreshold=t4[ENUM]
| || | +-dl_AM_RLC
| | | | +-t_Reordering=ms80 [ENUM]
| | | | +-t_StatusProhibit=ms60 [ENUM]
| | | +-logicalChannelIdentity=4 [INTEGER]
| | | +-logicalChannelConfig
| || +-ul_SpecificParameters
| || +-priority=13 [INTEGER]
| || +-prioritisedBitRate=infinity_ [ENUM]
| || +-bucketSizeDuration=ms100 [ENUM]
| || +-logicalChannelGroup=2 [INTEGER]
| | +-drb_ToReleaseList=omit
| | +-mac_MainConfig=omit
| | +-sps_Config=omit
| | +-physicalConfigDedicated=omit
| +-securityConfigHO=omit
| +-nonCriticalExtension=omit
+-Nas [RecordOf]
[0]
+-SecurityProtection
| +-Status='0010'B [BITSTRING]
+-Pdu
+-Msg
| \-aCTIVATE_DEDICATED_EPS_BEARER_CONTEXT_REQUEST [Union]
| +-epsBearerId='6'H[HEXSTRING]
| +-protocolDiscriminator='0010'B [BITSTRING]
| +-procedureTransactionIdentifier='00'O [OCTETSTRING]
| +-messageType='11000101'B[BITSTRING]
| +-spareHalfOctet='0'H[HEXSTRING]
| +-linkedEpsBearerId
| | +-idValue='0101'B[BITSTRING]
| +-epsQos
| | +-iei=omit
| | +-iel='09'O[OCTETSTRING]
| | +-qci='00000100'B[BITSTRING]
| | +-maxBitRateUl='01101000'B[BITSTRING]
| | +-maxBitRateDl='01101000'B[BITSTRING]
| |+-guaranteedBitRateUl='01001000'B [BITSTRING]
| |+-guaranteedBitRateDl='01001000'B [BITSTRING]
| |+-maxBitRateUlExt='00000000'B [BITSTRING]
| |+-maxBitRateDlExt='00000000'B [BITSTRING]
| |+-guaranteedBitRateUlExt='00000000'B [BITSTRING]
| |+-guaranteedBitRateDlExt='00000000'B [BITSTRING]
| +-tft
| | +-iei=omit
| | +-iel='23'O[OCTETSTRING]
| | +-tftOperationCode='001'B[BITSTRING] 表示创建TFT
| | +-eBit='0'B [BITSTRING]
| | +-noOfPktFilter='0010'B[BITSTRING]
| | +-packetFilterList[RecordOf]
| | | [0]
| | | | +-iei='10'O [OCTETSTRING] 其中可以表示Filter的方向。
| | | | +-precendence='00000000'B [BITSTRING]
| | | | +-iel='0E'O [OCTETSTRING] IPV4 remote Address type(具体内容参见10.5.162/3GPP 24.008)
| | | | +-contents='10C0A80101FFFFFFFF5079B83011'O [OCTETSTRING]
| | | [1]
| || +-iei='20'O[OCTETSTRING]
| || +-precendence='00000001'B [BITSTRING]
| || +-iel='0E'O[OCTETSTRING]
| || +-contents='10C0A80101FFFFFFFF50EE483011'O [OCTETSTRING]
| | +-parameterList=omit
| +-transactionIdentifier=omit
| +-negotiatedQos=omit
| +-negotiatedLlcSapi=omit
| +-radioPriority=omit
| +-packetFlowIdentifier=omit
| +-protocolConfigurationOptions=omit
+-PiggybackedPduList=omit
UE存贮得到的相应QoS信息， 并作相应的处理， 然后向eNodeB回应RRCConnectionReconfigurationComplete消息。eNodeB接收到UE的回应后， 回复给MME Bear Setup Response消息。
UE NAS层同时会构造Activate Dedicated EPS Bearer ContextComplete消息，并将其作为NAS PDU通过UL Info Transfer发送给eNodeB， eNodeB将此NAS PDU透传给MME。MME接收到后，生成 Create Bearer Response 消息， 发送给SGW和PGW。
GPRS Tunneling Protocol V2
Create Bearer Response
Flags:72
010. .... = Version: 2
.... 1... = T: 1
MessageType: Create Bearer Response (96)
MessageLength: 424
TunnelEndpoint Identifier: 1
SequenceNumber: 0
Spare:256
Cause:
IE Type: Cause (2)
IE Length: 2
000. .... = CR flag: 0
.... 0000 = Instance: 0
Cause: Request accepted (16)
.... ...0 = Cause Source (CS: True-Error originated by remote node,False-Error originated by Node sending the Message): False
BearerContext : [Grouped IE]
IE Type: Bearer Context (93)
IE Length: 37
000. .... = CR flag: 0
.... 0000 = Instance: 0
Cause :
IE Type: Cause (2)
IE Length: 2
000. .... = CR flag: 0
.... 0000 = Instance: 0
Cause: Request accepted (16)
.... ...0 = Cause Source (CS: True-Error originated by remote node,False-Error originated by Node sending the Message): False
EPS Bearer ID (EBI) :
IE Type: EPS Bearer ID (EBI) (73)
IE Length: 1
000. .... = CR flag: 0
.... 0000 = Instance: 0
.... 0110 = EPS Bearer ID (EBI): 6
Fully Qualified Tunnel Endpoint Identifier (F-TEID) :
IEType: Fully Qualified Tunnel Endpoint Identifier (F-TEID) (87)
IE Length: 9
000. .... = CR flag: 0
.... 0000 = Instance: 0
1... .... = V4 (True-IPV4 address field Exists,False-Doesn't Existin F-TEID): True
.0.. .... = V6(True-IPV6 address field Exists,False-Doesn't Existin F-TEID): False
...0 0000 = Interface Type: S1-U eNodeB GTP-U interface (0)
TEID/GRE Key: 34
F-TEID IPv4: 30.0.0.1 (30.0.0.1)
Fully Qualified Tunnel Endpoint Identifier (F-TEID) :
IE Type: Fully Qualified Tunnel Endpoint Identifier (F-TEID)(87)
IE Length: 9
000. .... = CR flag: 0
.... 0001 = Instance: 1
1... .... = V4 (True-IPV4 address field Exists,False-Doesn't Existin F-TEID): True
.0.. .... = V6(True-IPV6 address field Exists,False-Doesn't Existin F-TEID): False
...0 0001 = Interface Type: S1-U SGW GTP-U interface (1)
TEID/GRE Key: 34
F-TEID IPv4: 30.0.2.1 (30.0.2.1)
