Lte Shared
Lte Shared
Lte Shared
USER DESCRIPTION
Disclaimer
The contents of this document are subject to revision without notice due to
continued progress in methodology, design and manufacturing. Ericsson shall
have no liability for any error or damage of any kind resulting from the use
of this document.
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Contents
1 Introduction 1
1.1 Basic Characteristics 2
1.2 Benefits 2
1.3 Additional Information 2
2 Feature Operation 3
2.1 Network Requirements 3
2.2 PLMN Concept and Identity Relations 3
2.3 S1/X2 Connection Handling to Support Shared LTE RAN 5
2.4 SIB1 to Support Shared LTE RAN 5
2.5 Mobility to Support Shared LTE RAN 6
3 Parameters 11
3.1 Introduced Parameters 11
3.2 Affected Parameters 12
4 Network Impact 13
4.1 Mobility 13
6 Performance 17
6.1 KPIs 17
6.2 Counters 17
6.3 Events 18
7 O&M Information 19
1 Introduction
This document describes the Shared LTE RAN feature and its main benefits
and impacts in the LTE RAN.
A core network operator provides its mobile phone services through a Public
Land Mobile Network (PLMN). Conventionally, a PLMN consists of a RAN
and a core network, through which only one operator provides services to its
subscribers. Subscribers of other operators may receive services as national or
international roamers.
With the Shared LTE RAN feature, up to six operators (that is, with up to six
PLMNs) can share an LTE RAN.
Among all possible shared network configurations, the Shared LTE RAN feature
will support the following configurations:
GWCN MOCN
PDN-GW
and other core network nodes
SGW
MME
eNodeB
Cell
Product identity:
See Feature Overview
Replaces: N/A
Dependencies
1.2 Benefits
This section describes the benefits of this feature.
The Shared LTE RAN feature allows the operators to share a common
RAN. This provides operators with substantial cost reductions and a reduced
environmental footprint.
2 Feature Operation
This section describes the Shared LTE RAN feature in more detail, including
network configuration requirements and operation flows.
• Mobility
• The license for the Shared LTE RAN feature must be activated.
More details on the process required to load and activate the license are
provided in License Management.
0 Primary PLMN is the PLMN configured on the eNodeB level, that is,
the same for all the cells in the eNodeB.
• Served PLMNs: Served PLMNs are the PLMNs that are served by the
MME.
• Active PLMNs: Active PLMNs in a cell are all configured PLMNs in the cell,
which are served by at least one MME.
• Serving PLMN: Serving PLMN is the PLMN that the MME has selected to
serve the User Equipment (UE). Normally it is the same PLMN that the UE
selected when it connected to the network, that is, selected PLMN, unless
the Non-Access Stratum (NAS) layers have moved the UE to another
PLMN.
• Selected PLMN: Selected PLMN is the PLMN that has been selected
by the UE in accordance with 3GPP TS 23.122, either manually or
automatically. The selected PLMN is selected from the PLMNs included in
the PLMN-IdentityList in System Information Block Type 1 (SIB1).
|----|----|-----|----|--------|
MCC MNC MMEGI MMEC M-TMSI
|---------------|-------------|
GUGI S-TMSI
|----------|
MMEI
|---------|
PLMN-ID
|--------------------|
GUMMEI
|-----------------------------|
GUTI
|----|----|----|
MCC MNC TAC
|--------------|
TAI
The following identities are relevant to PLMN and are used in Example 1:
• Besides the primary PLMN, an additional PLMN list can be configured for
each cell. The additional PLMN list must be the same for all cells in an
eNodeB. The primary PLMN and the additional PLMN list will be sent to
MME in the S1AP S1 SETUP REQUEST. If the shared network support
service state is inoperable, only the primary PLMN is valid and should
be used.
For each own cell, the SIB1 may include more than one PLMN and it must
include all Active PLMNs. The Primary PLMN must always be broadcasted in
the SIB1, because it is used to construct the Cell Global Identity (CGI) used by
the UE to identify the cell. If the Primary PLMN is excluded as the Active PLMN,
the Primary PLMN will be marked as ‘‘Reserved for operator use’’ in the SIB1.
2.4.1 SIB1
Table 1 Parameter Settings in SIB1
3GPP Parameter Name Parameter Settings Comments
(first) PLMN-Identity ENodeBFunction.eNodeBPlmnI Primary
d PLMN
(first) cellReservedF Set to "reserved", if ENodeBF
orOperatorUse unction.ENodeBPlmnId is
NOT included in the EUtra
nCellFDD.activePlmnList.
Otherwise, set to EUtranCellFDD.
primaryPlmnReserved.
(other) PLMN-Identit Set according to EUtranCellFD Additional
y D.activePlmnList (exclusive PLMNs
Primary PLMN).
(other) cellReserved Set according to corresponding
ForOperatorUse EUtranCellFDD.additionalPl
mnReservedList
• Serving PLMN
• Equivalent PLMNs
The purpose of HRL is to let eNodeB appropriately select target cells for future
handovers, for example to avoid the situation where UE connected to a PLMN
(belonging to one operator) is handed over to a cell that is connected to neither
that PLMN nor any associated equivalent PLMN (other irrelevant operator).
The HRL is stored in the UE context and used for both measurement selection
and handover evaluation.
In accordance with standards, if the HRL is not contained in the message above,
the target eNodeB shall consider that no access restriction applies to the UE.
Handover request
Serving Plmn in Serving Plmn in MOCN with one PLMN MOCN with more
HRL found in HRL not found in per operator or no than one PLMN per
activePlmnList activePlmnList shared network operator or GWCN
L0000526A
In the Shared LTE RAN feature (supporting multiple PLMNs), different UE are
connected to networks belonging to different operators. To avoid UE belonging
to one operator being redirected or handed over to another operator's network,
an Allowed PLMN list is added to each frequency relation Managed Object
(MO) for all RATs. The Allowed PLMN list consists of 0 up to 15 PLMNs. If the
list is empty, the frequency relation is allowed for UE belonging to any PLMN. If
the list contains at least one PLMN, the frequency relation is only allowed for
UE that have at least one of the listed PLMN as serving PLMN or equivalent
PLMN in the HRL. The PLMN that can be included in the allowedPlmnList
should be possible to find on cells on that frequency. Forbidden IRAT IE in the
HRL is also checked to remove the indicated RATs.
This is also valid for blind release with direct and blind handover.
Handover evaluation decides whether a reported cell is suitable for the UE. The
target cells TAI is compared with the Forbidden TAIs in HRL. If all reported cells
are forbidden for the UE, the report is discarded. If it is still valid, the target cell
PLMN or PLMN list is compared with the UE serving PLMN and Equivalent
PLMNs. If there is a match between them, the best cell is selected as target cell.
In the Shared LTE RAN feature, since X2 handover signaling is only allowed if
the eNodeBs are connected to the same MME pool, the target eNodeB MME
pools must be compared with the UE serving MME before X2 handover is
selected instead of S1 handover. If the target eNodeB is not connected to the
MME pool to which the UE serving MME belongs, X2 handover is not allowed.
3 Parameters
This section describes parameters introduced by the Shared LTE RAN feature
and parameters affected by activating the feature.
• EUtranFreqRelation
• UtranFreqRelation
• GeranFreqGroupRelation
servedPlmnListLTERelated Lists the PLMN IDs served by the MME
servedPlmnListOtherRATs Lists PLMN IDs served by the MME for radio technologies other
than LTE
mmeGIListLTERelated MME group ID for LTE
mmeCodeListLTERelated MME code for LTE
mmeCodeListOtherRATs MME code for radio technologies other than LTE
nnsfMode Mode used by the RBS for the non-access stratum node selection
additionalPlmnReservedList Indicates if the list of PLMN IDs in the cellt are reserved for
operator use
additionalPlmnList Lists additional PLMN IDs supported in the cell
Parameter Description
activePlmnList Lists the PLMN IDs served by at least one MME
activePlmnList Lists the PLMN IDs of the external E-UTRAN cell
• EUtranCellRelation
• CDMA2000CellRelation
4 Network Impact
This section describes how the Shared LTE RAN feature impacts the network
functions and capabilities.
4.1 Mobility
This section provides information on the impact of the feature on mobility.
In the Shared LTE RAN feature, UE mobility can be extended with appropriate
configuration by the operator, for example the UE can be handed over from
network belonging to one operator to that belonging to another operator.
This section describes how the Shared LTE RAN feature affects other features
and functions.
6 Performance
6.1 KPIs
This feature has no associated Key Performance Indicators (KPIs).
6.2 Counters
Table 5 lists the important counters associated with the Shared LTE RAN
feature.
Table 5 Counters
Counter Description
pmPdcpVolDlDrbTransPlmn0 Total volume (PDCP SDU) on data radio bearers (1)that has been
transmitted in the downlink direction in the PDCP layer for
PLMN0
PLMN0 refers to the PLMN configured in the ENodeBFuncti
on.eNodeBPlmnId attribute.
pmPdcpVolDlDrbTransPlmn1 Total volume (PDCP SDU) on data radio bearers that has been
transmitted in the downlink direction in the PDCP layer for PLMN1
PLMN1 refers to the PLMN configured in the attribute
additionalPlmnList[0] located on the EUtranCellFDD MO.
pmPdcpVolDlDrbTransPlmn2 Total volume (PDCP SDU) on data radio bearers that has been
transmitted in the downlink direction in the PDCP layer for PLMN2
PLMN2 refers to the PLMN configured in the attribute
additionalPlmnList[1] located on the EUtranCellFDD MO.
pmPdcpVolDlDrbTransPlmn3 Total volume (PDCP SDU) on data radio bearers that has been
transmitted in the downlink direction in the PDCP layer for PLMN3
PLMN3 refers to the first PLMN configured in the attribute
additionalPlmnList[2] located on the EUtranCellFDD MO.
pmPdcpVolDlDrbTransPlmn4 Total volume (PDCP SDU) on data radio bearers that has been
transmitted in the downlink direction in the PDCP layer for PLMN4
PLMN4 refers to the first PLMN configured in the attribute
additionalPlmnList[3] located on the EUtranCellFDD MO.
Counter Description
pmPdcpVolDlDrbTransPlmn5 Total volume (PDCP SDU) on data radio bearers that has been
transmitted in the downlink direction in the PDCP layer for PLMN5
PLMN5 refers to the first PLMN configured in the attribute
additionalPlmnList[4] located on the EUtranCellFDD MO.
pmPdcpVolDlDrbTransPlmn6 Total volume (PDCP SDU) on data radio bearers that has been
transmitted in the downlink direction in the PDCP layer for PLMN6
PLMN6 refers to an unexpected PLMN, that is, a PLMN
that cannot be associated with any PLMN configured in the
ENodeBFunction or cell.
6.3 Events
Table 6 lists the important events associated with the Shared LTE RAN feature.
Table 6 Events
Event Event Parameter Description
INTERNAL_PROC_INITIA EVENT_PARAM_SERVINGPLMNID Serving PLMN of the UE based
L_CTXT_SETUP on the S1AP INITIAL CONTEXT
SETUP REQUEST message
INTERNAL_PROC_HO_PRE EVENT_PARAM_SERVINGPLMNID Serving PLMN of the UE based on
P_S1_IN the S1AP HANDOVER REQUEST
message
INTERNAL_PROC_HO_PRE EVENT_PARAM_SERVINGPLMNID Serving PLMN of the UE based on
P_X2_IN the X2AP HANDOVER REQUEST
message
INTERNAL_PROC_S1_SET EVENT_PARAM_MMENAME Serving PLMN of the UE based on
UP the X2AP HANDOVER REQUEST
message
INTERNAL_PROC_S1_SET EVENT_PARAM_S1_SETUP_RESU Remove the following cause values:
UP LT
EVENT_VALUE_GUGI_MISMATC
H_PROTOCOL_ERROR
EVENT_VALUE_PLMN_MISMATC
H_PROTOCOL_ERROR
Add the following cause value:
EVENT_VALUE_MAX_GUGI_EXC
EEDED
INTERNAL_PROC_X2_SET EVENT_PARAM_X2_SETUP_RESU Remove the following cause value:
UP LT
EVENT_VALUE_GUGI_MISMATC
H
7 O&M Information
This section provides Operation and Maintenance (O&M) information for the
Shared LTE RAN feature.
A license and parameter settings activate the Shared LTE RAN feature. Details
of the license activation process can be found in License Management