TechIPm Research

1. Lenovo's Key NEC 3G & & 4G Standard Essential Patents for Smartphones
Recently, Lenovo agreed to acquire 3,800 patent families from NEC to protect its smartphone business. Followings are the key standard
essential patents (SEPs) relating to 3G and 4G mobile communications selected from around 20 potential SEPs issued in the US that are
indentified by TechIPm’s essentiality evaluation. For more information, please contact Alex Lee at alexglee@techipm.com.
Patent
Number
Title Abstract/Claim Standard Specifications Families
US7203208 Mobile
communicati
on system,
communicati
on control
method and,
base station
and mobile
station to be
employed in
the same
In the communication system performing
transmission with generating the vacant
period in the slotted mode during data
transmission in order to perform various
process, such as different frequency carrier
quality measurement or so forth, the control
signal for maintaining a communication
quality is inserted even in the vacant period.
Therefore, a link quality may not be
degraded even if the vacant period is long.
Namely, when the pilot signal is used as the
control signal, even in the vacant period,
measurement of the link quality of the
3GPP TS 25.212
4.4 Compressed mode
In compressed frames, TGL slots from
Nfirst to Nlast are not used for
transmission of data. As illustrated in
figure 11, the instantaneous transmit power
is increased in the compressed frame in
order to keep the quality (BER, FER, etc.)
unaffected by the reduced processing gain.
The amount of power increase depends on
the transmission time reduction method
(see subclause 4.4.3). What frames are
CA2267841A1,
CA2267841C,
CN1115904C,
CN1234707A,
EP0949830A2,
EP0949830A3,
EP0949830B1,
EP1624708A2,
EP1624708A3,
US7154915,
US7940811,
US7944950,
US20030118057,

2. forward link with the pilot signal is
performed in the mobile station to report the
result of measurement to the base station.
Therefore, transmission power control of the
forward link can be performed according to
the report in the base station. Therefore,
degradation of the forward link can be
eliminated.
compressed, are decided by the network.
When in compressed mode, compressed
frames can occur periodically, as illustrated
in figure 11, or requested on demand. The
rate and type of compressed frames is
variable and depends on the environment
and the measurement requirements.
Figure 11: Compressed mode transmission
US20070058593
,
US20070081501
,
US20110176470,
US20110176533,
US20110243028,
US20110243049,
US 6847818 Transmission
power control
method and
system
A transmission power control technique
allowing stable and reliable signal
transmission in soft handover is disclosed.
Each of the base stations involved in soft
3GPP TS 25.214
5.2.1.4 Site selection diversity transmit
power control
CA2324727A1,
CA2324727C,
DE60034759D1,
DE60034759T2,
Oneframe
(10ms) Transmissiongapavailablefor
inter-frequencymeasurements

3. handover measures an amount of loss of the
base station selection signal. When the
amount of loss of the base station selection
signal exceeds a threshold, the transmission
power of the downlink signal is not set to
the minimum level but to the normally
controlled level. Further, a transmission
power update timing of each base station is
determined so that the downlink signal
received at the mobile station changes in
transmission power at a predetermined
timing synchronized with that of other base
stations.
Site selection diversity transmit power
control (SSDT) is another macro diversity
method in soft handover mode. This
method is optional in UTRAN.
The UE selects one of the cells from its
active set to be ‘primary’, all other cells
are classed as ‘non primary’. The main
objective is to transmit on the downlink
from the primary cell, thus reducing the
interference caused by multiple
transmissions in a soft handover mode. A
second objective is to achieve fast site
selection without network intervention,
thus maintaining the advantage of the soft
handover. In order to select a primary cell,
each cell is assigned a temporary
identification (ID) and UE periodically
informs a primary cell ID to the connecting
cells. The non-primary cells selected by
UE switch off the transmission power. The
EP1109330A2,
EP1109330A3,
EP1109330B1,
EP1478102A1,
EP1478102B1,
EP1770872A2,
EP1770872A3,
EP2293628A1,
EP2296411A1,
US7242959,
US7912493,
US8478330,
US20040152483
,
US20070232315
,
US20110130145

4. primary cell ID is delivered by UE to the
active cells via uplink FBI field. SSDT
activation, SSDT termination and ID
assignment are all carried out by higher
layer signalling.
US6359864 FDD/CDMA
Transmission
/reception
system
An FDD/CDMA transmission/reception
system includes a CDMA transmitter and a
CDMA receiver. The CDMA transmitter
includes a plurality of transmission
antennas, signal transmission units for
transmitting transmission signals weighted
by different values to the respective
transmission antennas, and pilot signal
transmission units for transmitting a
plurality of different pilot signals to the
respective transmission antennas. The
CDMA receiver includes a reception unit for
obtaining one received signal from the
transmission signals from the plurality of
transmission antennas of the CDMA
3GPP TS 25.211
5.3.3 Common downlink physical channels
In case transmit diversity (open or closed
loop) is used on any downlink channel in
the cell, the CPICH shall be transmitted
from both antennas using the same
channelization and scrambling code. In this
case, the pre-defined bit sequence of the
CPICH is different for Antenna 1 and
Antenna 2, see figure 14. In case of no
transmit diversity, the bit sequence of
Antenna 1 in figure 14 is used.
DE69629633D1,
DE69629633T2,
DE69637911D1,
EP0755127A2,
EP0755127A3,
EP0755127B1,
EP1133074A2,
EP1133074A3,
EP1133074B1,
US5886987,
US7324470,
US7830829,
US20020012333
,
US20070104154

5. transmitter in consideration of reception
quality, and a unit for transmitting antenna
control signals corresponding to reception
power values of the received pilot signals to
the CDMA transmitter.
slot #1
Frame#i+1Frame#i
slot #14
Antenna 2
Antenna 1
slot #0
FrameBoundary
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
Figure 14: Modulation pattern for
Common Pilot Channel
US8548008 Single carrier
transmission
system,
communicati
on device,
and single
carrier
transmission
method using
for them
The invention claimed is:
1. A wireless communication system
comprising:
a mobile station comprising a transmitter
which transmits a data signal and a pilot
signal; and
a base station comprising a receiver which
demodulates the data signal based on the
pilot signal,
wherein the transmitter calculates a
sequence of the pilot signal in a frequency
domain according to a present numerical
formula and a Zadoff-Chu sequence,
wherein the length of the Zadoff-Chu
sequence is a largest prime number among
3GPP TS 36.211
5.5 Reference signals
Reference signal sequence )()(
, nr vu

is
defined by a cyclic shift  of a base
sequence )(, nr vu according to
RS
sc,
)(
, 0),()( Mnnrenr vu
nj
vu  
where RB
sc
RS
sc mNM  is the length of the
reference signal sequence and
ULmax,
RB1 Nm  . Multiple reference signal
sequences are defined from a single base
sequence through different values of  .
Base sequences )(, nr vu are divided into
groups, where  29,...,1,0u is the group
CN101421956A,
CN101421956B,
CN103297371A,
EP1983672A1,
EP1983672A4,
EP2579534A2,
EP2579534A3,
US20090052427
,
US20140003544
,
WO2007091590
A1,

6. at least one prime number which is less than
the length of the pilot signal.
number and v is the base sequence
number within the group, such that each
group contains one base sequence ( 0v )
of each length RB
sc
RS
sc mNM  , 51  m
and two base sequences ( 1,0v ) of each
length RB
sc
RS
sc mNM  , ULmax,
RB6 Nm  . The
sequence group number u and the
number v within the group may vary in
time as described in Sections 5.5.1.3 and
5.5.1.4, respectively. The definition of the
base sequence )1(),...,0( RS
sc,, Mrr vuvu
depends on the sequence length RS
scM .
.
©2014 TechIPm, LLC All Rights Reserved