RAN Feature Description Table of Contents
Table of Contents
Chapter 15 Iu Flex...................................................................................................................... 15-1
15.1 Introduction to Iu Flex..................................................................................................15-1
15.1.1 Definition...........................................................................................................15-1
15.1.2 Purposes...........................................................................................................15-1
15.1.3 Benefits.............................................................................................................15-1
15.1.4 Terms and Abbreviations...................................................................................15-2
15.2 Availability....................................................................................................................15-3
15.2.1 Network Element Involved.................................................................................15-3
15.2.2 Software Release..............................................................................................15-3
15.2.3 Miscellaneous....................................................................................................15-4
15.3 Impact.......................................................................................................................... 15-4
15.3.1 On the System Performance.............................................................................15-4
15.3.2 On Other Features.............................................................................................15-4
15.4 Technical Description...................................................................................................15-4
15.4.1 Iu Flex Configuration Model...............................................................................15-4
15.4.2 Pool Area...........................................................................................................15-4
15.4.3 NRI....................................................................................................................15-6
15.4.4 NNSF.................................................................................................................15-7
15.4.5 Load Balancing and Flow Control....................................................................15-11
15.4.6 Support of the RNC on the Iu Flex...................................................................15-12
15.4.7 Impact on Signaling Procedures......................................................................15-12
15.5 Capabilities................................................................................................................15-13
15.6 Implementation..........................................................................................................15-13
15.6.1 Enabling Iu Flex...............................................................................................15-13
15.6.2 Reconfiguring Iu Flex Parameters...................................................................15-15
15.6.3 Disabling Iu Flex..............................................................................................15-15
15.7 Maintenance Information............................................................................................15-16
15.7.1 MML Commands Related to Iu Flex................................................................15-16
15.7.2 Alarms.............................................................................................................15-16
15.7.3 Counters..........................................................................................................15-16
15.8 References................................................................................................................. 15-17
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RAN Feature Description List of Figures
List of Figures
Figure 15-1 Iu Flex function diagram..................................................................................15-1
Figure 15-2 Iu Flex configuration model..............................................................................15-4
Figure 15-3 Pool area configuration example.....................................................................15-5
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RAN Feature Description List of Tables
List of Tables
Table 15-1 NEs required for Iu Flex.....................................................................................15-3
Table 15-2 Data negotiated for the Iu Flex........................................................................15-14
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RAN Feature Description Chapter 15 Iu Flex
Chapter 15 Iu Flex
15.1 Introduction to Iu Flex
15.1.1 Definition
The Iu Flex enables the connection of one node on the Radio Access Network (RAN)
to multiple nodes on the Core Network (CN) and the collection of one or more RAN
nodes into a pool area, as shown in Figure 15-1. In the same pool area, a UE roams
without need to change the serving CN node.
CS3
RNC
NodeB
PS2CS2CS1
PS1 PS3
Figure 15-1 Iu Flex function diagram
The Iu Flex involves the following concepts:
Pool Area
NRI
NNSF
15.1.2 Purposes
Before Iu Flex is introduced, one RAN node can be connected to only one CN node.
This brings a lot of inconvenience to network construction, for example, the
unbalanced signaling load on CN nodes. The load on some CN nodes is light, which
leads to low hardware usage, while the load on some other CN nodes is heavy, which
causes the CPU to work busily.
15.1.3 Benefits
The Iu Flex brings the following benefits:
Enhancing the flexibility of the Iu interface
Increasing the total capacity of CN nodes
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Enhancing the disaster tolerance capability of CN nodes
Reducing the signaling traffic of the CN
Enhancing the system utilization
In conclusion, the Iu Flex greatly enhances the serviceability of the whole network.
15.1.4 Terms and Abbreviations
I. Terms
Term Description
Iu Flex Intra Domain Connection of RAN Nodes to Multiple CN Nodes
CN node Node of the CN
II. Abbreviation
Abbreviation Full Spelling
3GPP Third Generation Partnership Project
BAM Back Administration Module
CN Core Network
CS Circuit Switched
FTP File Transfer Protocol
HLR Home Location Register
IDNNS Intra Domain NAS Node Selection
IE Information Element
IMEI International Mobile Equipment Identity
IMSI International Mobile Subscriber Identity
LA Location Area
LAI Location Area Identity
LMT Local Maintenance Terminal
MCC Mobile Country Code
MML Man Machine Language
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Abbreviation Full Spelling
MNC Mobile Network Code
MSC Mobile Switching Center
NAS Non-Access Stratum
NE Network Element
NNSF Non Access Stratum (NAS) Node Selection Function
NRI Network Resource Identifier
OMC Operation and Maintenance Center
PLMN Public Land Mobile Network
PS Packet Switched
P-TMSI Packet Temporary Mobile Subscriber Identity
RA Routing Area
RAI Routing Area Identity
RAN Radio Access Network
RANAP Radio Access Network Application Part
RNC Radio Network Controller
RRC Radio Resource Control
SGSN Serving GPRS Support Node
SIM Subscriber Identity Module
TMSI Temporary Mobile Subscriber Identity
UE User Equipment
USIM Universal Subscriber Identity Module
15.2 Availability
15.2.1 Network Element Involved
Table 15-1 describes the NEs involved with the Iu Flex feature.
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RAN Feature Description Chapter 15 Iu Flex
Table 15-1 NEs required for Iu Flex
UE NodeB RNC MSC Server MGW SGSN GGSN HLR
√ – √ √ – √ – –
Note:
–: not required
√: required
15.2.2 Software Release
This feature is available for BSC6800 V100R005 and later releases.
15.2.3 Miscellaneous
None.
15.3 Impact
15.3.1 On the System Performance
None.
15.3.2 On Other Features
None.
15.4 Technical Description
15.4.1 Iu Flex Configuration Model
The configuration model for Iu Flex is as show in Figure 15-2.
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RAN Feature Description Chapter 15 Iu Flex
RNC
RadioClass
GlobalParaClass OtherClass
IUFLEX .Class
Length of PS NRI in bits
NRIGLBCNIDMAP .Class
Network resource identity
IMSIIDNNSCNIDMAP .Class
Minimum of IMSI routeparameter in IDNNS
Length of CS NRI in bits Maximum of IMSI routeparameter in IDNNS
Figure 15-2 Iu Flex configuration model
15.4.2 Pool Area
In one pool area, a UE roams without need to change the serving CN node. One pool
area is served by one or more CN nodes in parallel.
The complete serving area of a RAN node belongs to one or more pool areas when
multiple overlapping pool areas include this RAN node serving area.
I. Characteristics
The pool area has the following characteristics:
A pool area is a collection of one or more MSC or SGSN serving areas.
A pool area is served by one or more CN nodes in parallel that share the traffic
of this area between each other.
The pool areas may overlap. The RAN node belongs to all the overlapping pool
areas.
In one pool area, the UE roams without need to change the serving CN node.
The pool areas of the CS domain and of the PS domain are configured
independently.
II. Implementation
Within a pool area, a UE is served by a specific CN node, as shown in Figure 15-3.
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RAN Feature Description Chapter 15 Iu Flex
Area 1
RANnode
Area 5
RANnode
Area 6
RANnode
Area 7
RANnode
Area 8
RANnode
Area 2
RANnode
Area 3
RANnode
Area 4
RANnode
PS pool-area 2PS pool-area 1
CS pool-area 2CS pool-area 1
MSC 3MSC 2
MSC 1
MSC 6MSC 5
MSC 4
SGSN 6
SGSN 2
SGSN 1
SGSN 5SGSN 4
SGSN 3
MSC 7
Figure 15-3 Pool area configuration example
There are four pool areas in this figure: CS pool area 1, CS pool area 2, PS pool area
1 and PS pool area 2. The pool areas are described as follows:
CS pool area 1: including RAN serving areas 1, 2, 5, and 6 served by MSCs 1, 2,
and 3
CS pool area 2: including RAN serving areas 2, 3, 6, and 7 served by MSCs 4, 5,
and 6
PS pool area 1: including RAN serving areas 1 and 5 served by SGSNs 1 and 2
PS pool area 2: including RAN serving areas 2, 3, 6, and 7 served by SGSNs 3,
4, and 5
RAN serving areas 4 and 8 are served by MSC 7 and SGSN 6 without using the
Iu Flex.
CS pool areas 1 and 2 overlap.
PS pool areas 1 and 2 do not overlap.
The pool areas of the CS and the PS domain may be configured identical as shown
by CS pool area 2 and PS pool area 2, or differently as shown by CS pool area 1 and
PS pool area 1.
The number and capacity of CN nodes are configured independently for each pool
area.
The Iu Flex can be configured only in parts of the network. The Iu-Flex-capable pool
areas co-exist with the areas that are not using this feature, for example, the RAN
node areas 4 and 8 served by MSC 7 and SGSN 6 as shown in Figure 15-3.
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15.4.3 NRI
The Network Resource Identity (NRI) identifies uniquely an individual CN node that
serves a pool area. Each CN node that supports the Iu Flex is configured with one or
more specific NRIs.
I. Characteristics
The NRI has following characteristics:
In a pool area, the NRI identifies uniquely a CN node.
The NRI is part of the Temporary Mobile Station Identity (TMSI) for the CS
domain or Packet TMSI (P-TMSI) for the PS domain. It is assigned by the
serving CN node to the UE. The TMSI or P-TMSI allocation mechanism in the
CN node generates TMSIs or P-TMSIs that contain a configured NRI in the
relevant bit positions.
The length of the NRI in bits ranges from 0 to 10 bits. The value 0 means that no
NRI is in use. The lengths of the NRIs are the same in all nodes of a domain in
one pool area.
In case of overlapping pool areas, the NRI lengths shall be configured the same
in all the nodes of a specific domain serving these pool areas.
The NRIs of the CS and the PS domain are independent of each other as the CN
nodes of the PS and the CS domain are accessed independently.
The corresponding relationship between the NRI and the CN nodes in the CN
pool area is configured in the RAN nodes. In CN pool areas, each CN node is
configured with the NRIs of other CN nodes.
II. Implementation
In the WCDMA system, the UE sends an RRC INITIAL DIRECT TRANSFER
message to the RAN node that contains an IE ”Intra Domain NAS Node Selection
(IDNNS)”. The IDNNS contains a route parameter with a fixed length of 10 bits that
transports the NRI value. In addition, the IDNNS contains an indication about from
which identity (TMSI/PTMSI, IMSI, IMEI) the route parameter is derived. The RAN
node masks the significant bits out of the route parameter part of the IDNNS to
determine the NRI that is relevant to identify the CN node.
15.4.4 NNSF
The NAS Node Selection Function (NNSF) selects the proper CN node (MSC or
SGSN) for the UE and sets up the traffic link to the selected CN node.
If the NNSF finds the CN node that the NRI derived from the initial NAS signaling
message identifies, it routes the message or frame to that CN node. Otherwise, the
NNSF selects an available CN node according to the signaling load balancing and
routes the message to the selected CN node.
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RAN Feature Description Chapter 15 Iu Flex
I. Characteristics
In the RAN node, the NNSF selects the specific CN node (MSC or SGSN) and routes
the initial NAS signaling messages to the selected node.
II. Implementation
The process is as follows:
2) The CN node allocates the route information to the UE. If the CN node supports
the Iu Flex, the TMSI (or P-TMSI) allocated by the node contains the NRI.
3) The UE encodes the route information according to the TMSI (or P-TMSI), IMSI
or IMEI to get the route parameter. The parameter consists of 10 bits. Then the
UE sends the parameter to the RNC through the INITIAL DIRECT TRANSFER
message.
4) The RNC selects the route according to the route parameter derived from the
INITIAL DIRECT TRANSFER message.
The details of the process are described as follows:
1) The CN node informs the UE of the route information.
When the CN node allocates the TMSI or P-TMSI to the UE, the node includes
its NRI in the bits 14–23. The length of the NRI ranges from 0 to 10 and needs to
be configured at the CN node and the RNC.
If the length is set to 0, it is an indication that no NRI is in use, that is, the Iu
Flex is not used.
If the length is set to n, it is an indication that the n bits from bit 14 are the
NRI.
2) The UE encodes the route information based on the sources that the route
information is derived from. The following sources are available:
TMSI or P-TMSI
The route parameter is obtained by the encoding of bits 14–23 in the
information elements (IE) identified by the TMSI or P-TMSI.
IMSI
The parameter value is (IMSI / 10) MOD 1000. It is an integer within the
range from 0 through 999. For route selection, each integer is configured to
a CN node on the RNC LMT.
IMEI
The parameter value is (IMEI / 10) MOD1000. It is an integer within the
range from 0 through 999. For route selection, each integer is configured to
a CN node on the RNC LMT.
The UE encodes the route information according to the following rules:
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The UE preferentially encodes the route information identified by the TMSI
or P-TMSI.
If the TMSI or P-TMSI is unavailable and the UE contains the USIM or SIM
card, the UE encodes the route information identified by the IMSI.
If the TMSI or P-TMSI is unavailable and the UE does not contain the USIM
or SIM card, the UE encodes the route information identified by the IMEI.
The length of the route parameter after encoding is 10 bits. The parameter and
the encoding mode are saved in the IDNNS of the INITIAL DIRECT TRANSFER
message, which is sent to the RNC.
3) The RNC selects the route based on the route parameter in the IDNNS of the
INITIAL DIRECT TRANSFER message as follows:
When the route parameter is derived from the TMSI or P-TMSI
The RNC derives the NRI from the parameter according to the configured
length of the NRI. Then the RNC selects the CN node according to the
configured corresponding relationship between the NRI and the CN node. If
no NRI is configured to the CN node, the RNC selects a CN node based on
the load balancing.
The length of the NRI is configured for the CN domains as Length of CS
NRI in bits and Length of PS NRI in bits respectively.
Parameters:
Parameter Name Length of PS NRI in bits
Parameter ID PSNRILength
GUI Range 1–10
Physical Range& Unit None
Default Value Value according to the data from CN configuration
Optional/Mandatory Optional
MML Command SET IUFLEX
Description:
If the specified CN domain is set as supporting the Iu Flex function, Length of the
NRI in bits must be set.
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Parameter Name Length of CS NRI in bits
Parameter ID CSNRILength
GUI Range 1–10
Physical Range& Unit None
Default Value Value according to the data from CN configuration
Optional/Mandatory Optional
MML Command SET IUFLEX
Description:
If the specified CN domain is set as supporting the Iu Flex function, Length of the
NRI in bits must be set.
Parameter Name Network resource identity
Parameter ID NRI
GUI Range 0–1023
Physical Range& Unit None
Default Value Value according to the data from CN configuration
Optional/Mandatory Mandatory
MML Command ADD NRIGLBCNIDMAP
MOD NRIGLBCNIDMAP
Description:
One CN node may have many different NRIs.
Different CN nodes connected to the same RNC must use different NRIs.
For example, CS CN node 1 has an NRI of 5, and the Length of CS NRI in
bits is set to 6. If the route parameter derived from the TMSI IDNNS in an
INITIAL DIRECT TRANSFER message is 000101**** (totally 10 bits; * can be
‘0’ or ‘1’ ), then this message will be routed to CN node 1.
When the route parameter is derived from the IMSI
The parameter is an integer within the range from 0 through 999. The value
can be derived by (IMSI/10) MOD 1000. The RNC selects the CN node
according to the configured corresponding relationship between the IMSI
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IDNNS route parameter and the CN node. One integer is configured to one
specific CN node.
The RNC configures the relationship between the IMSI IDNNS route
parameter and a CN node as that the CN node has a range from Minimum
of IMSI route parameter in IDNNS to Maximum of IMSI route parameter
in IDNNS. If the IMSI IDNNS route parameter is in this range, the RNC will
route the UE to the specified CN node.
Parameters:
Parameter Name Minimum of IMSI route parameter in IDNNS
Parameter ID ImsiRtMin
GUI Range 0–999
Physical Range& Unit None
Default Value None
Optional/Mandatory Mandatory
MML Command ADD IMSIIDNNSCNIDMAP
MOD IMSIIDNNSCNIDMAP
Description:
The relationship between the IMSI IDNNS route parameter’s value range and the
CN node allows a group of UEs to be routed to one CN node.
In this case, the operator can plan the ranges between CN nodes according to
their capability. If one CN node can afford more UEs, a larger range can be
assigned to it.
It is recommended not to overlay the range for different CN nodes in the same CN
domain.
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Parameter Name Maximum of IMSI route parameter in IDNNS
Parameter ID ImsiRtMax
GUI Range 0–999
Physical Range& Unit None
Default Value None
Optional/Mandatory Mandatory
MML Command ADD IMSIIDNNSCNIDMAP
MOD IMSIIDNNSCNIDMAP
Description:
The relationship between the IMSI IDNNS route parameter’s value range and the
CN node allows a group of UEs to be routed to one CN node.
In this case, the operator can plan the ranges between CN nodes according to
their capability. If one CN node can afford more UEs, a larger range can be
assigned to it.
It is recommended not to overlay the range for different CN nodes in the same CN
domain.
When the route parameter is derived from the IMEI
The RNC selects the CN node based on load balancing.
III. Processing the IMSI Paging Message by the NNSF (CS domain)
To increase the success rate of routing the paging response message to the CN node
that issues the paging request, the Iu-Flex-capable RNC needs to process the IMSI
paging message as follows:
In R5 protocols, an optional IE “Global CN-ID” is added to the RANAP PAGING
message. If RNC provides the Iu Flex feature and the paging message contains
only the IMSI rather than the TMSI, the paging message must contain Global
CN-ID.
The NNSF in the RNC temporarily stores the IMSI and Global CN-ID upon
reception of the paging message. When the NNSF receives the INITIAL DIRECT
TRANSFER message (a paging response with an IMSI), it directly forwards the
paging response to the CN node identified by the Global CN-ID.
If the CN node is set to Mode 1, that is, the Gs interface exists, the paging
message of the CS domain might be delivered on the Iu-PS interface. In this
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RAN Feature Description Chapter 15 Iu Flex
case, the SGSN adds the Global CN-ID of the CS domain into the paging
message.
IV. Processing the IMSI Paging Message by the NNSF (PS domain)
The RNC does not need to save the Global CN-ID when the RNC processes the IMSI
paging message for the PS domain.
According to 3GPP TS 23.236, a UE returns an Attach Request containing the IMSI
parameter as a response to the IMSI paging that it receives from the PS domain.
Moreover, the SGSN does not start the timer for the PS IMSI paging after sending the
message. Therefore, the NNSF in the RAN node does not need to save the SGSN ID
when it receives the paging request.
15.4.5 Load Balancing and Flow Control
The NNSF balances the signaling load between the available CN nodes. This is
performed by selecting a proper CN node for the UE that has not been assigned to a
CN node, for example, when there is no CN node configured for the NRI indicated by
the UE or when the CN node corresponding to an NRI cannot be reached.
The process is described as follows:
1) When the CN node is overloaded, the CN sends an overload message to the
RNC to initiate the flow control procedure.
2) The RNC activates the CN short-time flow control timer IGORTIMR and the CN
long-time flow control timer INTRTMR, and then it discards INITIAL DIRECT
TRANSFER messages from the UE at the proportion of the step specified in the
overload message multiplied by 5.
If the RNC receives the overload message only once and the step specified
in the message is 2, 10% INITIAL DIRECT TRANSFER messages will be
discarded, because 2 x 5% = 10%.
If the RNC receives overload messages continually, the traffic is reduced all
the way until it reaches the lower limit of 30%.
The functions of the two types of flow control timers are described as follows:
The CN short-time flow control timer IGORTMR is used to prevent the CN
from sending overload messages continually.
Continual transmission of overload messages is invalid before this timer
expires.
The CN long-time flow control timer INTRTMR is used to control the
recovery of the traffic flow.
The traffic flow is recovered at the rate of 1 x 5%, that is, each time the timer
expires, the traffic volume increases 5%.
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15.4.6 Support of the RNC on the Iu Flex
The RNC implements the Iu Flex as follows:
3) The RNC gets the NRI from the IDNNS in the INITIAL DIRECT TRANSFER
message. Then it finds the CN node according to the corresponding relationship
between the NRI and the CN node that is configured in the RNC LMT.
4) The RNC saves the relationship between IMSI and Global CN-ID if the paging
massage that the RNC receives from the CS domain does not carry the TMSI.
After receiving from the UE the INITIAL DIRECT TRANSFER massage that is
the response to the paging, the RNC routes the UE to the correct CN domain
according to the relationship.
5) The RNC selects a CN node from the available CN nodes according to the load
balancing under any of the following situations:
The selected CN node is not available.
No CN node is configured for the requested NRI.
The provided identity contains no NRI.
6) The RNC routes the signaling connection message to the selected CN node.
15.4.7 Impact on Signaling Procedures
The Iu Flex has impact on the following signaling procedures:
Traffic request for starting Attach and the UE
Traffic starting request on network side (IMSI paging)
Update of the routing area
IMSI attach process/ location update with IMSI
In these procedures, the UE provides the IDNNS to the RNC by sending an
RRC_initial_DT message. The RNC selects the route according to the route
parameters in the INITIAL DIRECT TRANSFER message, gets the destination CN
node address and sends the INITIAL UE message to the CN node.
15.5 Capabilities
None.
15.6 Implementation
15.6.1 Enabling Iu Flex
I. Hardware Installation
The Iu Flex module is integrated into the RNC and CN node. No extra hardware is
required.
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II. License Update
Purchase the related license, and then perform the following steps:
7) Get the new license.
8) Download the license to BAM software installation directory\FTP\license through
File Transfer Protocol (FTP).
9) Execute ACT LICENSE on the M2000 or RNC Local Maintenance Terminal
(LMT) to activate the license.
III. Data Configuration
To configure the data, perform the following steps:
10) Execute ADD CNDOMAIN to add the CN domain data.
11) Execute ADD CNNODE to add the CN node data. Set CN protocol version to
R5 or a higher value.
12) Execute SET IUFLEX to set the Iu Flex feature and the parameters CS NRI
length and PS NRI length.
13) Execute ADD NRIGLBCNIDMAP to add the mapping between the NRI and the
Global CN-ID.
14) Execute ADD IMSIIDNNSCNIDMAP to add the mapping between the IMSI route
parameters and the Global CN-ID.
For details about parameter configuration on the CN side, refer to the related
documentation.
IV. Verification of the Enabled Feature
To verify the enabled feature, execute LST IUFLEX on the RNC LMT to check the Iu
Flex configuration at the RNC for both CN domains.
V. Example
Assume that the pool area contains two MSCs: MSC 1 and MSC 2. The ID of the
local RNC is 1. Table 15-1 lists the data negotiated for the Iu Flex.
Table 15-1 Data negotiated for the Iu Flex
Item MSC 1 MSC 2
NRI length 4 4
NRI 8 9
CN node ID 1 2
CN node MCC 460 460
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Item MSC 1 MSC 2
CN node MNC 08 08
Value range of the IMSI route parameter
in the IDNNS0–300, 800–900 301–799, 901–999
//(1) Update the license.
//(2) Add the CN domain data.
ADD CNDOMAIN: CNDomainId=CS_DOMAIN;
ADD CNDOMAIN: CNDomainId=PS_DOMAIN;
//(3) Add the CN node data.
ADD CNNODE: CNId=1, CNDomainId=CS_DOMAIN, Dpx=1, CNProtclVer=R5,
SupportCRType=CR529_SUPPORT;
ADD CNNODE: CNId=2, CNDomainId=CS_DOMAIN, Dpx=2, CNProtclVer=R5,
SupportCRType=CR529_SUPPORT;
//(4) Set the Iu Flex feature.
SET IUFLEX: CsIuFlexFlag=ON, NNSfTmr=3, CSNRILength=4;
//(5) Add the mapping between the NRI and the Global CN-ID.
ADD NRIGLBCNIDMAP: CNId=1, NRI=8;
ADD NRIGLBCNIDMAP: CNId=2, NRI=9;
//(6) Add the mapping between IMSI route parameters and the Global CN-ID.
ADD IMSIIDNNSCNIDMAP: CNNodeMCC="460", CNNodeMNC="08", ImsiRtMin=0,
ImsiRtMax=300, CNId=1;
ADD IMSIIDNNSCNIDMAP: CNNodeMCC="460", CNNodeMNC="08", ImsiRtMin=800,
ImsiRtMax=900, CNId=1;
ADD IMSIIDNNSCNIDMAP: CNNodeMCC="460", CNNodeMNC="08", ImsiRtMin=301,
ImsiRtMax=799, CNId=2;
ADD IMSIIDNNSCNIDMAP: CNNodeMCC="460", CNNodeMNC="08", ImsiRtMin=901,
ImsiRtMax=999, CNId=2;
15.6.2 Reconfiguring Iu Flex Parameters
To reconfigure Iu Flex parameters, perform the following steps:
15) Execute LST CNDOMAIN to query the CN domain data, and then execute MOD
CNDOMAIN to modify the data as required.
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16) Execute LST CNNODE to query the CN node data, and then execute MOD
CNNODE to modify the data as required.
17) Execute LST IUFLEX to query the Iu Flex configuration, and then execute SET
IUFLEX to modify the configuration as required.
18) Execute LST NRIGLBCNIDMAP to query the mapping between the NRI and the
Global CN-ID, and then execute RMV NRIGLBCNIDMAP or ADD
NRIGLBCNIDMAP to remove or add the mapping as required.
19) Execute LST IMSIIDNNSCNIDMAP to query the mapping between IMSI route
parameters and the Global CN-ID, and then execute RMV
IMSIIDNNSCNIDMAP or ADD IMSIIDNNSCNIDMAP to remove or add the
mapping as required.
15.6.3 Disabling Iu Flex
I. Data Configuration
To disable the Iu Flex feature on the RNC side, perform the following steps:
20) Execute RMV IMSIIDNNSCNIDMAP to remove the mapping between IMSI route
parameters and the Global CN-ID.
21) Execute RMV NRIGLBCNIDMAP to remove the mapping between the NRI and
the Global CN-ID.
22) Execute SET IUFLEX to set the CS and PS domains to not supporting the Iu
Flex.
II. Verification of the Disabled Feature
To verify that the Iu Flex feature is disabled, execute LST IUFLEX on the RNC LMT.
III. Example
//(1) Remove the mapping between IMSI route parameters and the Global CN-ID.
RMV IMSIIDNNSCNIDMAP: CNNodeMCC="460", CNNodeMNC="08", ImsiRtMin=0,
ImsiRtMax=300, CNId=1;
RMV IMSIIDNNSCNIDMAP: CNNodeMCC="460", CNNodeMNC="08", ImsiRtMin=800,
ImsiRtMax=900, CNId=1;
RMV IMSIIDNNSCNIDMAP: CNNodeMCC="460", CNNodeMNC="08", ImsiRtMin=301,
ImsiRtMax=799, CNId=1;
RMV IMSIIDNNSCNIDMAP: CNNodeMCC="460", CNNodeMNC="08", ImsiRtMin=901,
ImsiRtMax=999, CNId=1;
//(2) Remove the mapping between the NRI and the Global CN-ID.
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RAN Feature Description Chapter 15 Iu Flex
RMV NRIGLBCNIDMAP: NRI=8, CNId=1;
RMV NRIGLBCNIDMAP: NRI=9, CNId=2;
//(3) Set the CS and PS domains to not supporting the Iu Flex.
SET IUFLEX: CsIuFlexFlag=OFF, PsIuFlexFlag=OFF;
15.7 Maintenance Information
15.7.1 MML Commands Related to Iu Flex
Command Executed to…
ADD CNDOMAIN Add the CN domain data.
MOD CNDOMAIN Modify the CN domain data.
ADD CNNODE Add the CN node data.
MOD CNNODE Modify the CN node data.
LST IUFLEX List the Iu Flex configuration.
SET IUFLEX Set the Iu Flex data.
ADD NRIGLBCNIDMAPAdd the mapping between the NRI and the Global
CN-ID.
RMV NRIGLBCNIDMAPRemove the mapping between the NRI and the
Global CN-ID.
ADD IMSIIDNNSCNIDMAPAdd the mapping between IMSI route parameters
and the Global CN-ID.
RMV IMSIIDNNSCNIDMAPRemove the mapping between IMSI route
parameters and the Global CN-ID.
15.7.2 Alarms
None.
15.7.3 Counters
None.
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RAN Feature Description Chapter 15 Iu Flex
15.8 References
3GPP TS 23.236 5.2.0 "Intra-domain connection of Radio Access Network
(RAN) nodes to multiple Core Network (CN) nodes"
3GPP TS 25.875 5.0.0 "Non Access Stratum (NAS) Node Selection Function"
3GPP TS 25.401 5.2.0 "UTRAN Overall Description"
3GPP TS 25.410 5.0.0 "UTRAN Iu Interface: General Aspects and Principles"
3GPP TS 25.413 5.0.0 "UTRAN Iu interface RANAP signalling"
3GPP TS 25.331 "Radio Resource Control (RRC)”
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