owo145020 wran13 dc-hsdpa+mimo feature description issue 1.01
DESCRIPTION
OWO145020 WRAN13 DC-HSDPA+MIMO Feature Description ISSUE 1.01TRANSCRIPT
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WRAN13.0 DC-HSDPA+MIMO Feature Description
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DC-HSDPA+MIMO is specified in 3GPP Release 9.
DC-HSDPA+MIMO evolves from the HSDPA feature specified in 3GPP Release 5.
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In RAN11.0, 64QAM and MIMO improve user experience greatly. They especially increase
the user rate under advantageous channel conditions. Their advantages for cell-edge users,
however, are insignificant.
To extend the service life of the HSPA+ technology, 3GPP has tried many ways to further
improve the system performance and user throughput since Release 6. 3GPP introduces
dual-cell HSDPA (DC-HSDPA) in Release 8. This feature improves the user throughput by
using a wider spectrum. The peak rate per user increases to 42 Mbit/s (with DC-
HSDPA+64QAM).
3GPP specifies DC-HSDPA+MIMO in Release 9. This feature combines DC-HSDPA in Release
8 and MIMO in Release 7. This feature allows NodeB to send HSDPA data to a UE
simultaneously over two adjacent carriers on the same frequency band within the same
coverage area in MIMO mode. The peak rate per user increases to 84 Mbit/s theoretically
(with DC-HSDPA+MIMO+64QAM).
If an operator owns two or more carriers, DC-HSDPA+MIMO can benefit the system and
users greatly and thereby sharpen the competitiveness of the operator.
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Carrier configurations
In DC-HSDPA+MIMO mode, uplink connections exist on only the primary carrier.
Downlink connections exist on both carriers. On the primary carrier, the UE
monitors all downlink physical channels. On the secondary carrier, the UE monitors
only the P-CPICH and HSDPA related physical channels.
Both MIMO carriers must be configured in P/S-CPICH mode.
Bearer services
CS and voice services are carried on the primary carrier.
BE and stream services can be carried on the carrier in DC-HSDPA+MIMO mode as
configured.
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DC-HSDPA+MIMO increases the transmission rate of most users, including the users at low
and medium signal-to-noise ratios (SNRs). In addition, thanks to the scheduling gain, this
feature increases the system capacity, as compared with independent carrier scheduling.
MIMO, however, varies its performance gains with scenarios. MIMO applies especially to
the propagation scenarios at high SNRs or with low delay spreads. In a scenario with good
channel conditions, rich scattering, and low delay spread, MIMO brings a great
performance gain. Therefore, the scenarios to which DC-HSDPA+MIMO applies depend on
the scenarios to which MIMO applies.
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With the DC-HSDPA feature introduced in 3GPP Release 8, the CN delivers up to 42 Mbit/s
rates in the downlink and up to 256 Mbit/s RAB assignment. Therefore, CN does not need
to be adapted to DC-HSDPA+MIMO in RAN13.0.
The UE must be of category 25, 26, 27, or 28.
UEs of categories 25 and 26 support DC-HSDPA+MIMO+16QAM. UEs of categories 27 and
28 support DC-HSDPA+MIMO+64QAM.
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RAN13.0 does not support joint inter-board scheduling.
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A DC-HSDPA+MIMO UE indicates its capability in this information element HS-DSCH
physical layer category extension 3.
A UE of category 28 supports a peak rate of 84.384 Mbit/s at the MAC layer.
2 x 2 x TB_Size/TTI = 2 x 2 x 42192/2 ms = 84.384 Mbit/s
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HARQ combines FEC and ARQ.
With HARQ, the UE saves an erroneously received packet, combines the erroneous data
with the data that the NodeB retransmits, and then decodes the packet.
Located at the physical layer, HARQ reduces the retransmission delay greatly.
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DC-HSDPA+MIMO impacts the following items:
At the MAC layer
MAC-ehs structure
At the physical layer
Channel mapping
Uplink feedback channel
HS-SCCH
HARQ handling
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DC-HSDPA+MIMO supports joint scheduling and improved Layer-2 processing.
Joint scheduling allows transmitting data from the same MAC-d queue over two carrier
cells.
Improved Layer-2 processing allows segmenting an RLC PDU at the MAC layer.
Transmitting the RLC PDU segments over two carrier cells improves the downlink coverage
performance.
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The MAC-ehs entity orders, schedules, and transmits data for UEs with HSDPA, enhanced
HSDPA, and DC-HSDPA+MIMO in a unified manner.
The MAC-ehs entity supports joint inter-carrier scheduling.
A DC-HSDPA+MIMO UE uses two HS-DSCH channels. Each channel is associated with one
HARQ entity.
At least one of the two HS-DSCH channels is configured in MIMO mode. Both channels
can be configured in MIMO+64QAM mode.
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The UE sets up two HS-DSCH connections. Each HS-DSCH connection is configured in
MIMO or MIMO+64QAM mode.
One carrier serves as the primary carrier and the other carrier serves as the secondary
carrier.
The UE sets up dedicated control channels on the primary carrier.
The UE sends CQI feedback in the HS-DPCCH on the primary carrier.
The NodeB transmits data by using two antennas on each carrier.
Both cells with DC-HSDPA+MIMO must be configured in P/S-CPICH mode.
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An HSDPA-MIMO UE in 3GPP Release 7 reports HARQ ACK/NACK and CQI in the HS-
DPCCH.
A DC-HSDPA+MIMO UE also reports the information in a single HS-DPCCH channel.
A new HS-DPCCH frame format is defined for DC-HSDPA. In this format, a frame
carries PCI, two types of CQI, and HARQ ACK/NACK for two carriers during each
TTI.
When the secondary carrier is deactivated, the frame format and feedback
information in the uplink feedback channel for DC-HSDPA+MIMO are identical to
the frame format and feedback information in the uplink feedback channel for
MIMO in 3GPP Release 7.
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UEs of categories 25 to 28 support DC-HSDPA+MIMO.
DC-HSDPA+MIMO reuses the CQI tables for MIMO.
When a DC-HSDPA+MIMO UE is not configured with 64QAM, CQI tables C and D
apply to single-stream transmission and CQI tables H and I apply to dual-stream
transmission.
When a DC-HSDPA+MIMO UE is configured with 64QAM, CQI tables F and G apply
to single-stream transmission and CQI tables J and K apply to dual-stream
transmission.
The specification 25.214 (R9) can be referred for the detailed information about CQI
mapping table C, D, G,H and etc.
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DC-HSDPA+MIMO reuses the HS-SCCH orders for DC-HSDPA to activate and deactivate the
secondary carrier.
The content in HS-SCCH type 1:
CCS: Channelization-code-set information
MS: Modulation scheme information
TBS: Transport-block size information
HAP: Hybrid-ARQ process information
RV: Redundancy and constellation version
ND: New data indicator
* in HS-SCCH order means the bit is reserved.
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If a 100 Mbit/s FE interface is configured for the transmission, the 84 Mbit/s rate may keep
the DSP in DPU* board busy with anti-pressure flow control.
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During RAB setup, a carrier cell is selected according to the following principles:
A DRD candidate set is generated according to the DRD quality conditions.
If the service requires the HSPA+ feature, the cells in the DRD candidate set are
sorted in descending order of the HSPA+ satisfaction. The carrier cell with the
highest HSPA+ satisfaction is preferred. The order of the HSPA+ technical
satisfaction will be discussed in the next slide.
If two carrier cells have the same HSPA+ satisfaction and the service steering switch
is enabled, the carrier cell is selected according to the service steering principles.
If two carrier cells have the same HSPA+ satisfaction and service priority, the carrier
cell is selected according to the load balance principles.
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If downlink Layer-2 enhancement is not considered and DC-HSDPA+MIMO (with
64QAM) has the highest priority, the sorting depends on the maximum rate.
DC-HSDPA (with 64QAM) and MIMO+64QAM are sorted by using a switch.
DC-HSDPA (with 16QAM), MIMO, and 64QAM are sorted by using a switch.
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In the table of the slide, these features are extracted: DC-HSDPA+MIMO+64QAM, DC-
HSDPA+MIMO, and DC-HSDPA+64QAM. They are sorted in this order: DC-
HSDPA+MIMO+64QAM > DC-HSDPA+MIMO > DC-HSDPA+64QAM. (DC-HSDPA
takes precedence over the combinations of MIMO and 64QAM. For example, although
DC-HSDPA+1xMIMO and MIMO+64QAM support the same maximum rate 42 Mbit/s,
DC-HSDPA+MIMO is prior to MIMO+64QAM).
Assume that DC-HSDPA+MIMO+64QAM is available. The combinations of MIMO and
64QAM except DC-HSDPA are sorted according to the maximum rate. For example, the
DC-HSDPA+MIMO+64QAM combinations in the preceding table are sorted in this order:
(1) > (2) > (4) > (3).
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Although a MIMO or DC-HSDPA+MIMO UE may consume an additional physical CE on the
NodeB side, only a licensed CE is consumed on the RNC side.
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From the figure in the slide we can see that
The throughput of DC-HSDPA+MIMO is almost double of MIMO throughput due
to the gain of dual carriers.
Compared with DC-HSDPA, DC-HSDPA+MIMO has 50% gain in cell edge.
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The figure in the slide shows the throughput of full buffer service in single carrier. (For DC-
HSDPA user, the throughput of single carrier means the average throughput per carrier. )
We can see that
DC-HSDPA+MIMO has 8% gain compared with MIMO due to the multi-user
diversity gain.
DC-HSDPA+MIMO has 17% gain compared with DC-HSDPA due to the dual stream
and Tx diversity gain of MIMO.
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From the figure in the slide we can see that
20% of DC-HSDPA users throughput can reach 2Mbps, while 30% of DC-
HSDPA+MIMO users throughput can reach 2Mbps.
10% of DC-HSDPA+MIMO users throughput can reach 3Mbps while no DC-
HSDPA users throughput can reach 3Mbps.
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Burst service is sensitive to time delay. Here we focus on the time delay of burst service.
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From the figure in the slide we can see that DC-HSDPA+MIMO has obvious gain compared
with DC-HSDPA. It is mainly because of MIMO. Whats more, the time delay gain will
increase as the increasing of the UE number.
When there are not many users in the cell, the wireless resource is not limited.
Then the traffic data can be transferred quickly for all the users. The time delay has
no much difference between DC-HSDPA+MIMO and DC-HSDPA.
When there are many users in the cell, the wireless resource is limited. Then the
traffic data can not be transferred quickly for all the users. In this scenario MIMO
can increase the data rate and decrease time delay.
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From the figure in the slide we can see that DC-HSDPA+MIMO has obvious gain compared
with MIMO. It is mainly because of DC-HSDPA. Whats more, the time delay gain will
decrease as the increasing of the UE number.
When there are not many users in the cell, the wireless resource is not limited. The
DC-HSDPA+MIMO user can get wireless resource from both carriers. So DC-
HSDPA+MIMO has much time delay gain compared with MIMO.
When there are many users in the cell, the wireless resource is limited. The DC-
HSDPA+MIMO user can not always get wireless resource from both carriers. So the
time delay between HS-HSDPA+MIMO and MIMO is not so different.
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Ensure that the two DC-HSDPA+MIMO carriers are adjacent. The difference between the
UARFCNDownlink numbers of two adjacent carriers is less than or equal to 25 and greater
than 0. Ensure that the two DC-HSDPA+MIMO carriers have the same Tcell offset.
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