Summary of changes
2. For the ARFCN value list object, set the ARFCN value list ( arfcnValueListGERAN ) parameter value.
3.4 LTE951: Enhanced Cell ID Location Service
3.5.2 Activating and configuring LTE1117: LTE MBMS Before you start
The following information provides the details and conditions for correct activation of the LTE1117: LTE MBMS feature.
g
Note: The LTE1117: LTE MBMS feature has to be activated on all the eNBs with the same MBSFN SYNC using the NetAct Configurator for this purpose. More information can be found in the NetAct documentation following the path below:NetAct Documentation ► Configuration Management ► Configuration Management Operating Procedures ► Managing the Network with NetAct Configurator ►
Managing Multimedia Broadcast Multicast Service (MBMS) with a workflow
The table below lists the parameters used for activating and configuring the LTE1117: LTE MBMS feature.
Table 32 Parameters used for activating and configuring the LTE1117: LTE MBMS feature
Parameter Purpose Requires eNB restart or
object locking Activate support for MBMS (actMBMS) activation flag no LNBTS: LNMCE parameters mandatory configuration no LNMCE: LNM3 parameters mandatory configuration no LNMCE: MBSFN parameters mandatory configuration no
All the parameters can be found in Management data.
Certain parameters have to be set consistently between eNBs and BM-SC. Please refer to the sections below.
MBMS subframe percentage determination
When determining the percentage of downlink subframes that need to be allocated to MBMS, the operator needs to consider the following items:
• data rates of MBMS services that will be transmitted simultaneously • MCS at which the MBMS data will be transmitted (Data MCS) • system bandwidth (10, 15, or 20 MHz)
The Table 33: MBMS Data Rate table, derived from TS36.213 section 7.1.7.2.1, provides guidance for making subframe percentage selections based on the above items. Nokia recommends subframe percentage selection not to exceed 40% to ensure that unicast capacity is not adversly affected.
Table 33 MBMS Data Rate table
Data Bits/Second versus MBMS Data MCS* Cell BW (MHz) % SD for MBMS MCS 5 MCS 10 MCS 15 MCS 20 10 40 1581120 3153600 5080320 7698240 15 40 2416320 4665600 7698240 11828160 20 40 3153600 6324480 10200960 15773760 10 35 1383480 2759400 4445280 6735960 15 35 2114280 4082400 6735960 10349640 20 35 2759400 5533920 8925840 13802040 10 30 1185840 2365200 3810240 5773680 15 30 1812240 3499200 5773680 8871120 20 30 2365200 4743360 7650720 11830320 10 25 988200 1971000 3175200 4811400 15 25 1510200 2916000 4811400 7392600 20 25 1971000 3952800 6375600 9858600 10 20 790560 1576800 2540160 384912 15 20 1208160 2332800 3849120 5914080 20 20 1576800 3162240 5100480 7886880 10 15 592920 1182600 1905120 2886840 15 15 906120 1749600 2886840 4435560 20 15 1182600 2371680 3825360 5915160 10 10 395280 788400 1270080 1924560 15 10 604080 1166400 1924560 2957040 20 10 788400 1581120 2550240 3943440 10 5 197640 394200 635040 962280
Table 33 MBMS Data Rate table (Cont.)
Data Bits/Second versus MBMS Data MCS* Cell BW (MHz) % SD for MBMS MCS 5 MCS 10 MCS 15 MCS 20 15 5 302040 583200 962280 1478520 20 5 394200 790560 1275120 1971720 10 2.5 98820 197100 317520 481140 15 2.5 151020 291600 481140 739260 20 2.5 197100 395280 637560 985860 * Bits/Second is reduced by 10% due to MBMS signaling subframes and RLC/MAC header overhead.
MBMS Subframe Percentage Examples Example 1: Single service
• video stream with 720p @ 2 Mbps • cell BW = 15 MHz • data MCS selected = 10 Based on the video specifications, and using the MBMS Data Rate table, 30% MBMS subframes is the lowest MBMS subframe percentage that provides at least 2 Mbps (2,365,200 bps) with the given parameters.
Example 2: Multiple services with multiple data MCSs Video stream with 720p @ 2 Mbps • cell BW = 10 MHz • data MCS selected = 10 Audio Streaming @ 100 kbps • cell BW = 10 MHz • data MCS selected = 15 The video stream will require at least 30% MBMS sub frames to achieve 2 Mbps (2,365,200 bps) ) at 10 MHz and MCS = 10. The audio streams will require an additional 100 Kbps at 10MHz and MCS = 15. Since the 30% of MBMS sub frames selected provides 2,365,200 Kbps, the remaining bandwidth is more than is necessary for the audio, this excess bandwidth is more than enough to support the 100 Kbps required by the audio streams. No additional MBMS sub frames need to be allocated for the audio. Configuration for MBMS data flow synchronization
In order to ensure synchronized radio interface, MBMS transmission from the cells controlled by different eNBs, MBMS SYNC-protocol [TS 25.446] support is needed between BM-SC and the eNBs.
As part of the SYNC-protocol, certain parameters have to be set consistently between the BM-SC and the eNBs, namely:
• Common time reference: on the eNB, this parameter is called MBMS SYNC Reference. This parameter has to be set in the same way on both the eNB and BM- SC after ensuring that both the eNB and BM-SC are synchronized to the same clock source such as NTP or GPS synchronization. Example: Based on NTP on the eNB, if MBMS SYNC Reference::Integral Seconds is set to 3615771600, and MBMS SYNC Reference::Fractional Seconds is set to 0, then the same equivalent value has to be provisioned on the BM-SC. • Synchronization Period: as part of the SYNC-protocol, both BM-SC and eNB for each service have to maintain the same synchronization period. On the eNB, this parameter is called MBMS SYNC Period, after which the relative timestamps within the SYNC PDUs can wrap around. • Synchronization sequence: Each SYNC PDU contains a timestamp that indicates the start time of a sequence for an MBMS service. Since the BM-SC is not aware of the MCE/eNB scheduling boundaries, the synchronization sequence length that is configured on the BM-SC has to be proportional to the Multicast Channel Scheduling Period (MSP) on the eNB. The MSP length provisioned in the eNB is one or multiple times of the synchronization sequence length for MBMS services in the MCH. The BM-SC includes a timestamp in the SYNC PDUs, based on which the eNB has to send MBMS data over the air interface. The time stamping of SYNC PDUs, is based upon a relative time value from the above common time reference, which refers to the start time of the synchronization period. The eNB will schedule the received data packets in the first MSP following the time point indicated by the timestamp. If they are not configured properly, a poor MBMS service may be observed due to excessive packet drops. Too long of an MSP with a high dataMCS will require that large amounts of data are buffered at the eNB prior to the MBMS transmission. If the buffered data size becomes too large, packets may become lost.
The Activate support for MBMS (actMBMS) parameter can only be set to true only if all the following conditions are fulfilled:
• The eNB has the RNW database activated and is in service.
• NetAct is in service and the DCN connection to eNB is established via OMS. • At least one S1 link is established.
• MBMS-related information in the transport domain is configured.
• At least one LNCEL instance with earfcn equal to MBSFN-mbsfnEarfcn and chBw equal to MBSFN-mbsfnDlChBw must be created.
• The following conditions must be fulfilled in all cells which are candidates for MBMS broadcasting, that is with earfcn equal to MBSFN-mbsfnEarfcn and chBw equal to MBSFN-mbsfnDlChBw:
– The LTE48: High speed users feature is deactivated, that is prachHsFlag is equal to false in all LNCEL instances with earfcnDL equal to MBSFN- mbsfnEarfcn.
– The LTE1382: Cell resource groups feature is deactivated, that is cellResourceSharingMode equal to none.
– The LTE1113: eICIC-macro and LTE1496 eICIC-micro features are deactivated, that is actEicic is equal to false.
– If the LTE495: OTDOA is activated, that is if actOtdoa is equal to ‘true’ restriction for configuration of the parameter prsConfigurationIndex is considered.
– TDD subframe configuration sa2 (3GPP 36.331) is selected, that is tdFrameConf is equal to '2'.
– The restrictions on the configuration of the CSI-RS subframe configuration (LNCEL parameter csiRsSubfrConf) are considered.
• The drxOnDuratT, drxRetransT and raRespWinSize parameters must be: – greater than or equal to 6 if subfrPShareRequired is less than or equal to
20.
– greater than or equal to 10 if subfrPShareRequired is greater than 20. • SIB13 must be present in sibSchedulingList-siMessageSibType. • The following configuration rules apply.
– The LTE124: IPv6feature must not be activated, that is the IPNO parameter actIpv6 is equal to false.
– The LTE505: Transport Separation for RAN Sharing must not be activated, that is the IPNO parameter actSeparationRanSharing is equal to false.
– The LTE4: RAN Sharing feature is not configured, that is no further PLMN-Ids are configured in LNCEL parameter furtherPlmnIdL. Multiple S1 links are only used for redundancy but not for RAN sharing.
g
Note:• The MCE configuration must be aligned between eNBs/cells belonging to the same MBSFN synchronization area.
• The configuration of features LTE495 (OTDOA), LTE843 (ETWS), LTE494 (CMAS) and the setting of the LNCEL parameter sib2xTransmit must be aligned between adjacent eNBs with activated feature ‘MBMS' and belonging to the same MBSFN area, that is with the same mbsfnAreaId.
To activate and configure the feature, do the following:
Procedure
1 Follow the general procedure described in section Activating and deactivating
LTE features using the BTS Site Manager.
In Step 3 (Modify the feature-specific eNB configuration settings) of the general procedure perform the steps described in this procedure.
2 Change the Network synchronisation mode to Phase synchronization.
a) Go to the BTS Synchronization Settings page.
b) Change the Network synchronization mode by choosing Phase synchronization from the drop-down menu.
3 Create the managed objects related to the configuration of the MBMS functionality.
• LNBTS: LNMCE • LNMCE: LNM3 • LNMCE: MBSFN
a) Go to the Radio Network Configuration page. b) Expand the MRBTS object.
c) Right-click on the LNBTS and create a new LNMCE object.
d) Right-click on the LNMCE and create a new LNM3 and MBSFN objects.
4 Set the required values in the MBSFN object.
a) Go to the Radio Network Configuration page. b) Expand the MRBTS object.
c) Expand the LNBTS object.
d) Expand the MBSFN object and configure the required parameters:
• Set the required value of the MBSFN Area Identity (mbsfnAreaId) between 0 and 225.
• Set the required value of the Required MBSFN subframe pattern share (subfrPShareRequired) from the drop down menu.
• Set the required value of the Signaling Modulation and coding scheme (signallingMCS) from the drop down menu.
e) Expand the MBSFN object
f) Select the MBMS Service Area and type the required service area identifier. An example for a valid service area identifiers is: 0x00, 0x01, 0x3c5e.
g) Select the MBSFN SYNC reference object and type in the desired values of the following parameters:
• Fractional seconds • Integral seconds
h) Select the Multicast channel info object and type in the desired values of the following parameters:
• Data modulation Code Scheme • MBMS Sync period
• Multicast channel Scheduling period
i) Select the LNM3object; set the required value of the LTE MME M3 link identifier parameters and type in the desired IPv4 address under the M3Primary IPv4 address using the correct IP format.
5 Define a new SIB Type (LNCEL:siMessageSibType) dedicated for the SIB13 in the System Information Scheduling list for each LNCEL instance of an eNB supporting MBMS.
a) Go to the Radio Network Configuration page. b) Expand the MRBTS object.
c) Expand the LNBTS object. d) Expand the LNCEL object.
e) Select and click the System information scheduling list. f) SelectSIB13 in SIB Type dropdown list and define Periodicity and
Repetition
g) Proceed with definition of SIB13 in System information scheduling list for each LNCEL managed object defined for LNBTS
6 Activate the feature flag for LTE1117.
a) Go to the Radio Network Configuration page. b) Expand the MRBTS object.
c) Select the LNBTS object.
d) Set the Activate support for MBMS (actMBMS) parameter value to true.
7 Send the parameters to the eNB according to the procedure described in section Activating and deactivating LTE features using BTS Site Manager.
Expected outcome
MBMS is configured and activated