DL - 4G Americas

These two advantages are illustrated in Figure 7.8.
+ +
Figure 7.8. Illustration of the Conceptual Gains that can be Achieved by Dynamic Deactivating
Secondary Carriers by Means of HS-SCCH Orders.
In figure 7.8, user 1 (white) has carrier c3 as its primary serving cell and user 2 (light blue) has carrier c1
as its primary frequency. The left side of Fig. 7.8 depicts a scenario where both users have all carriers
activated and the users are scheduled in a CDM fashion. The right side of Fig. 7.8 illustrates the scenario
where the serving Node-B has deactivated part of the secondary serving cells. This may increase data
rates (due to less intra-cell interference) as well as enable significant UE battery savings (since the can
switch off one of its receiver chains).
7.2.2 ADDITIONAL BAND COMBINATIONS FOR DB‐DC‐HSDPA
To enable more operators to enjoy the benefits of DB-DC-HSDPA operation, 3GPP introduced support for
DB-DC-HSDPA operation in the following two additional band combinations during Rel-10 (in addition to
123 124
the three band combinations introduced during Rel-9):
� Band I (2100 MHz) and Band XI (1500 MHz): This band combination is intended for ITU region 3
� Band II (1900 MHz) and Band V (850 MHz): This band combination is intended for ITU region 2
(Americas)
Both of these band combinations are introduced in a release-independent manner, which means that a
Rel-9 device is able to indicate support for the band combinations in question.
7.3 MULTI‐RAT RELATED ENHANCEMENTS
3GPP is currently defining system and service enhancements that will be needed to help deliver the
expected advance applications that users will demand in the future.
7.3.1 HOME NODEB/ENODEB ENHANCEMENTS
For UMTS HNB, basic solutions for inbound handover were defined in Rel-8/Rel-9. For example, inter-
RAT handover, from UTRA macrocell to LTE femtocell is not supported. Consequently, it was proposed
that the Home (e)NodeB (HeNB) support be further enhanced in Rel-10 with the following features:
� Intra-CSG/Inter-HeNB Handover Optimization
� Inter-CSG Handover Optimization
123 3GPP Tdoc RP-100657, Support of New Band Combinations for Dual-Band Dual-Cell HSDPA.
124 3GPP Tdoc R4-104427, Addition of new band combinations for DB-DC-HSDPA, Ericsson, ST-Ericsson.
www.4gamericas.org February 2011 Page 65