A Method for controlling Uplink transmission in a management
device of LTE-A network and the device thereof
Field of the Invention
The present invention relates to control for uplink transmission
of UE (User Equipment) , more particularly to a method for controlling
uplink transmission in a management device of LTE-A network and the
device thereof.
Background of the Invention
To support the new features of UL SU-MIMO, non-contiguous resource
allocation (RA) and carrier aggregation (CA) in LTE-A Rel-10, UL
transmission mode needs to be determined and the downlink control
information format (DCI format) for UL grant needs to be designed,
and control signaling overhead and blind decoding complexity is
particularly involved therein.
In latest standardization meetings, in terms of the above three
features, consensus is agreed as follows:
1 .DL/UL transmission mode can be configured independently.
2 . about non-contiguous RA
• Frequency hopping is not supported simultaneously with
non-contiguous PUSCH resource allocation;
Support dynamic switching between Rel-8 single cluster
transmission and Rel-10 multi-cluster PUSCH transmission;
No additional blind decodings to support non-contiguous
UL RA in single antenna transmission case
" o additional blind decodings to support non-contiguous
UL RA" also applies to SU-MIMO case if SU-MIMO is supported with
non-contiguous UL RA.
3 .About CA
CIF is not included in DCI format 0 , 1A in common search
space when CRC is scrambled by C-RNTI/SPS C-RNTI;
• Cross carrier scheduling for DCI format 0 , 1 , 1A, IB, ID,
2 , 2A, 2B in UE specific search space should be supported by explicit
CIF always, wherein DCI format 0 for UL grant, and other DCI format
for indicating the DCI format of control information used when UE
receiving downlink signal.
4 .about UL SU-MIMO
At least two new Rel-10 UE-specific RRC-conf igured
transmission modes for PUSCH of UE with multiple Antenna Ports (AP) :
•Single-antenna port mode;
Multi-antenna port mode supporting up to 2 Transport
Block (TB) , wherein, the number of antenna ports depends
on the UE capability;
FFS whether or not a third RRC-conf igured multi-antenna
transmission mode is needed.
For PUSCH, a dynamic switching between the configured
transmission scheme and a single-port fallback scheme with the same
DCI format for all RRC configured modes;
2NDI and 2A/N are needed for up to 2TBs;
• Reuse the C (codeword) -to-layer mapping principle as in
LTE Rel-8 DL spatial multiplexing;
For 2-Tx, 3-bit precoding codebook(CB) is specified,
wherein :
Size-6 CB for rank-1 precoding;
1 identity matrix for rank-2 (namely full-rank) precoding;
For 4-Tx, 6-bit precoding codebook is specified, wherein:
Size-24 CB for rank-1 precoding;
Size-16 CB for rank-2 precoding;
Size-12 CB for rank-3 precoding;
1identity matrix for rank-4 (namely full-rank) precoding;
Other related issues
Dynamic aperiodic SRS is supported;
CS separation is the primary multiplexing scheme of DM RS;
OCC separation between slots may be used as complementary
multiplexing scheme of DM RS,where the OCC index is implicitly derived .
Summary of the Invention
At least one embodiment of the present invention originates
from realizing of technical problem in the prior art, specifically,
such technical problems may directly impact DCI format design for
UL grant, which is needed to be further designed and determined
particularly:
Whether to support multiple clusters (more than 2);
Whether to support per -antenna /per -CW UL power control using
multiple TPC commands;
Whether to support dynamic CS configuration for multiple
layers via explicit signaling;
How to implement TB (transmission block ) disabling function
so as to support dynamic rank adaptation.
In Rl-102826, titled as "Transmission Modes and Signaling for
UL MIMO", there is provided a current DCI format of UL grant, as
shown in Table 1 .
In Table 1 , the scenario of contiguous RA is taken as an example.
A s for the above technical problem in the prior art, according
to at least one embodiment of the present invention, there is
provided a new uplink transmission mode and UL grant DCI format,
Table 1 DCI format for UL grants. The differences due to UL SU-MIMO are highlighted, assume contiguous RA
with aforesaid latest agreement taken into account, and size of
the new DCI format is optimized. Advantageously, there is also
provided a transmission block disabling scheme, such that dynamic
rank adaptation and 1-CW retransmission are supported.
Correspondingly, according to configured uplink transmission
mode, UE blindly detects and searches, in common search space and
the UE-specif ic search space, downlink control information format
corresponding to such transmission mode with a limited number,
and conducts UL transmission based on the decoded downlink control
information .
According to an embodiment of the present invention, there is
provided a method of providing, for a dual-antenna UE, downlink
control information used for uplink transmission in a management
device of enhanced LTE network, comprising the steps of :determining
an uplink transmission scheme for the dual-antenna UE;
semi-stat ically configuring, by high level signaling, the uplink
transmission mode to which the uplink transmission scheme belongs;
generating downlink control information corresponding to the
determined uplink transmission scheme, the downlink control
information comprising a first indicating field, a second
indicating field, a new-data indicating field for a first
transmission block and a new-data indicating field for a second
transmission block; wherein, when transmission block disabling
function is adopted in the determined uplink transmission scheme,
disablement of at least one of two transmission blocks is
represented by a first combination of the values of the first
indicating field and the second indicating field; and the disabled
transmission block of the two transmission blocks is represented
by a combination formed by the new-data indicating field for the
first transmission block and the new-data indicating field for
the second transmission block; transmitting the generated downlink
control information to the dual-antenna UE .
According to another embodiment of the present invention, there
is provided a method of providing, for a multi-antenna UE, downlink
control information used for uplink transmission in a management
device of LTE-A network, comprising the steps of: determining an
uplink transmission scheme for the multi-antenna UE ;
semi-stat ically configuring, by high level signaling, the uplink
transmission mode to which the uplink transmission scheme belongs;
generating downlink control information corresponding to the
determined uplink transmission scheme, the downlink control
information comprising a precoding matrix indicating field, and
further comprising a new-data indicating field for a first
transmission block and a new-data indicating field for a second
transmission block; wherein, when transmission block is disabled
for the determined uplink transmission scheme, disablement of at
least one of two transmission blocks is represented by a first
value of the precoding matrix indicating field; and the disabled
transmission block of the two transmission blocks is represented
by a combination of the new-data indicating field for the first
transmission block and the new-data indicating field for the second
transmission block; the downlink control information further
comprises respective redundant version fields of
modulation-coding modes of the two transmission blocks, wherein,
the redundant version field of modulation-coding mode of the
disabled transmission block is utilized to represent thepre-coding
matrix information of channel coding codeword which is mapped by
the transmission block without being disabled; transmitting the
generated downlink control information to the multi-antenna UE .
Furthermore, to support more denotation of precoding matrix,
the downlink control information further comprises a TB-codeword
mapping indicating field, for representing, collaboratively with
the redundant version field of modulation-coding mode of the
disabled transmission block, the pre-coding matrix information
of channel coding codeword which is mapped by the transmission
block without being disabled.
According to another embodiment of the present invention, there
is provided a method of providing, for a dual-antenna UE, downlink
control information used for uplink transmission in a management
device of LTE-A network, comprising the steps of: determining an
uplink transmission scheme for the dual-antenna UE;
semi-stat ically configuring, by high level signaling, the uplink
transmission mode to which the uplink transmission scheme belongs;
generating downlink control information corresponding to the
determined uplink transmission scheme, wherein, when the uplink
transmission scheme is of a closed-loop spatial multiplexing
transmission with up to two codewords, the downlink control
information comprising: a Resource Block assignment and hopping
information field; a transmission block disabling indicating field;
a TB-codeword mapping indicating field; a redundant version field
of modulation-coding mode of every transmission block; a new-data
indicating field of every transmission block; a transmission power
control field; a cycle shift field for demodulation reference signal
corresponding to a first channel coding codeword; a CQI request
field; a SRS request field; a CIF field; an UL index (TDD only)
field; a CRC field; transmitting the generated downlink control
information to the dual-antenna UE .
According to still another embodiment of the present invention,
there is provided a method of providing, for a multi-antenna UE,
downlink control information used for uplink transmission in a
management device of LTE-A network, comprising the steps of:
determining an uplink transmission scheme for the multi-antenna
UE; semi-stat ically configuring, by high level signaling, the
uplink transmission mode to which the uplink transmission scheme
belongs; generating downlink control information corresponding
to the determined uplink transmission scheme, wherein, when the
uplink transmission scheme is of a closed-loop spatial multiplexing
transmission with up to two codewords, the downlink control
information comprising: a Resource Block assignment and hopping
information field; a precoding matrix indicating field; a
TB-codeword mapping indicating field; a redundant version field
of modulation-coding mode of every transmission block; a new-data
indicating field of every transmission block; a transmission power
control field; a field of cycle shift for demodulation reference
signal corresponding to a first channel coding codeword; a CQI
request field; a SRS request field; a CIF field; an UL index (TDD
only) field; a CRC field; transmitting the generated downlink
control information to the multi-antenna UE .
According to yet another embodiment of the present invention,
there is provided a method of providing, for a multi-antenna UE,
downlink control information used for uplink transmission in a
management device of LTE-A network, comprising the steps of:
determining an uplink transmission scheme for the multi-antenna
UE ; semi-stat ically configuring, by high level signaling, the
uplink transmission mode to which the uplink transmission scheme
belongs; generating downlink control information corresponding
to the determined uplink transmission scheme, wherein, when the
uplink transmission scheme is of a closed-loop spatial multiplexing
transmission with single layer, the downlink control information
comprising: a Resource Block assignment and hopping information
field; a precoding matrix indicating field; a redundant version
field of modulation-coding mode of transmission block; a new-data
indicating field of transmission block; a transmission power
control field; a field of cycle shift for demodulation reference
signal corresponding to a channel coding codeword; a CQI request
field; a SRS request field; a CIF field; an UL index (TDD only)
field; a CRC field; transmitting the generated downlink control
information to the multi-antenna UE .
According to yet another embodiment of the present invention,
there is provided a method of controlling uplink transmission of
a UE in a management device of LTE-A network, wherein, the method
comprises the steps of: predetermining three uplink transmission
modes for the UE, the three uplink transmission mode comprises
a first uplink transmission mode, a second uplink transmission
mode and a third uplink transmission mode, wherein: the first uplink
transmission mode corresponds to transmission of single-antenna
port; the second uplink transmission mode corresponds to
transmission of single-antenna port or closed-loop spatial
multiplexing transmission with up to two codewords; the third uplink
transmission mode corresponds to transmission of single-antenna
port or closed-loop spatial multiplexing transmission with single
layer; when the UE is a dual-antenna UE, the downlink control
information provided for closed-loop spatial multiplexing
transmission with up to two codewords to be conducted by the UE
has a format as aforesaid; or when the UE is a multi-antenna UE
other than dual-antenna UE, the downlink control information
provided for closed-loop spatial multiplexing transmission with
up to two codewords to be conducted by the UE has a downlink control
information format as aforesaid.
According to yet another embodiment of the present invention,
there is provided a first device of providing, for a dual-antenna
UE, downlink control information used for uplink transmission in
a management device of LTE-A network, comprising: a first unit
for determining an uplink transmission scheme for the dual-antenna
UE ; a second unit for semi-stat ically configuring, by high level
signaling, the uplink transmission mode to which the uplink
transmission scheme belongs; a third unit for generating downlink
control information corresponding to the determined uplink
transmission scheme, the downlink control information comprising
a first indicating field, a second indicating field, a new-data
indicating field for a first transmission block and a new-data
indicating field for a second transmission block; wherein, when
transmission block disabling function is adopted in said determined
uplink transmission scheme, disablement of at least one of two
transmission blocks is represented by a first combination of the
values of the first indicating field and the second indicating
field; and the disabled transmission block of the two transmission
blocks is represented by a combination formed by the new-data
indicating field for the first transmission block and the new-data
indicating field for the second transmission block; a first
transmitting device for transmitting the generated downlink
control information to the dual-antenna UE .
According to yet another embodiment of the present invention,
there is provided a second device of providing, for a quadri-antenna
UE, downlink control information used for uplink transmission in
a management device of LTE-A network, comprising: a fourth unit
for determining an uplink transmission scheme for the
quadri-antenna UE ; a fifth unit for semi-stat ically configuring,
by high level signaling, the uplink transmission mode to which
the uplink transmission scheme belongs; a sixth unit for generating
downlink control information corresponding to the determined
uplink transmission scheme, the downlink control information
comprising a precoding matrix indicating field, and further
comprising a new-data indicating field for a first transmission
block and a new-data indicating field for a second transmission
block ; wherein, when transmission block disabling function is adopted
in said determined uplink transmission scheme, disablement of at
least one of two transmission blocks is represented by a first
value of the precoding matrix indicating field; and the disabled
transmission block of the two transmission blocks is represented
by a combination of the new-data indicating field for the first
transmission block and the new-data indicating field for the second
transmission block; the downlink control information further
comprises respective redundant version fields of
modulation-coding modes of the two transmission blocks, wherein,
the redundant version field of modulation-coding mode of the
disabled transmission block represents the pre-coding matrix of
channel coding codeword which is mapped by the transmission block
without being disabled; a second transmitting device for
transmitting the generated downlink control information to the
multi-antenna UE .
Moreover, to support more types of denotation of precoding
matrix, the downlink control information further comprises a
TB-codeword mapping indicating field, for representing,
collaboratively with the redundant version field of
modulation-coding mode of the disabled transmission block, the
pre-coding matrix information of channel coding codeword which
is mapped by the transmission block without being disabled.
A s compared with the prior art, according to embodiments of
the present invention, there is provided uplink transmission mode
and downlink control information format for uplink grant, for
dual-antenna and quadr i-antenna UE and the scenario with more
antennas, wherein, signalling overhead and blind decoding
complexity is effectively controlled. Additionally, transmission
block disabling and one-codeword retransmission scheme is
effectively implemented.
Brief Description of the Drawings
Features, aspects and advantages of the present invention will
become more obvious by reading the following description of
non-limiting embodiments with the aid of appended drawings.
Figure 1 illustrates one typical application scenario for the
present invention;
Figure 2 illustrates a flowchart of a method of providing, for
a dual-antenna UE, downlink control information used for uplink
transmission in a management device of enhanced LTE network
according to one embodiment of the present invention;
Figure 3 illustrates a flowchart of a method of providing, for
a multi-antenna UE, downlink control information used for uplink
transmission in a management device of enhanced LTE network
according to one embodiment of the present invention;
Figure 4 illustrates a function block diagram of a first device
of providing, for a dual-antenna UE, downlink control information
used for uplink transmission in a management device of enhanced
LTE network according to one embodiment of the present invention;
Figure 5 illustrates a function block diagram of a second device
of providing, for a mult i-antenna UE, downlink control information
used for uplink transmission in a management device of enhanced
LTE network according to one embodiment of the present invention;
Wherein, same or similar reference numerals refer to the same
or similar device (module ) or step of method.
Detailed description of embodiments
At least one embodiment of the method and device of present
invention as shown in figures would be recited hereafter. It should
be appreciated that, such embodiments are set forth by explanation
of every aspect of the present invention, rather than being
interpreted as a limitation to the present invention. For instance,
portions of feature represented or recited as one embodiment may
be used in another embodiment, thereby rendering another embodiment
The present invention covers such embodiments and various
variations falling within the scope and spirit of the present
invent ion .
Fig.l shows a one application scenario for at least one the
embodiment of the present invention, wherein, there is shown a
management device 11, for example an eNodeB referred to as base
station 11 hereinafter, in LTE-A network is shown, additionally,
two UEs are briefly illustrated, wherein UE 12 employs two antennas,
referred to be as dual-antenna UE, UE 13 employs four antennas,
referred to be as quadri-antenna UE . With reference to the
description for UE 12, 13 hereinafter, those skilled in the art
may apply the present invention to other UE and management device
not shown in the figure. Explanation for method, device of those
embodiments according to the present invention will be made with
every Network Element shown in Fig.l centered around.
With reference to Fig. 2 , a flowchart of a method of providing,
for a dual-antenna UE, downlink control information used for uplink
transmission in a management device of enhanced LTE network
according to one embodiment of the present invention is illustrated.
In step S200 , Base station 1 1 determines three uplink transmission
schemes for dual-antenna UE, as shown specifically in Table 2 .
UL transmission mode 1 (ULTM1) is configured for single-antenna
port scheme with contiguous or non-contiguous RA, where only one
type of DCI format, namely DCI format 0 is included. If DCI format
OhasnotCIF, it couldbe allocatedin common search space
it is allocated in UE-specific search space.
Table 2: PDCCH and PUSCH for 2-Tx configured by C-RNTI
Wherein, after determining the corresponding uplink
transmission schemes in step S201, in step S202, semi-stat ically
configure, by high level signaling, the uplink transmission mode
to which the uplink transmission scheme belongs, and in step S203,
the downlink control information generated for single-port
transmission to be performed by dual-antenna UE 12 has a format
of downlink control information with a numbering of 0 ; yet if
dual-antenna UE 12 is due to conduct a closed-loop spatial
multiplexing transmission with up to two codewords, then the format
of downlink control information (marked as DCI format OD) generated
in step S203, may be as Tale 3 :
Table 3: Message Contents of DCI Format OD for 2-Tx and DCI Format OC for 4-Tx
A s shown in Table 3 , DCI format 0D comprises first indicating
field and second indicating field, which specifically may be
implemented respectively by transmission block disabling
indicating field and TB-codeword mapping indicating field, and
further comprises a first transmission block, for example new-data
indicating field for CWO and a second transmission block, for
example the new-data indicating field for CW1 .
Wherein, when transmission block disabling function is adopted
in the determined uplink transmission scheme, disablement of at least
one of two transmission blocks is represented by a first combination
of the values of the transmission block disabling indicating field
and the TB-codeword mapping indicating field; and the disabled
transmission block of the two transmission blocks is represented
by a combination formed by the new-data indicating field for the
first transmission block and the new-data indicating field for
the second transmission block.
Still as shown in Table3, when one-codeword retransmission is
usedinthe determined uplink transmission scheme, the one-codeword
retransmission, of one transmission block of the both transmission
blocks transmitted last time , is represented by a second combination
formed by the values of the transmission block disabling indicating
field and the TB-codeword mapping indicating field, and the
transmission block, for the one-codeword retransmission, of the
both transmission blocks is represented by the combination formed
by the new-data indicating field for a first transmission block
and the new-data indicating field for a second transmission block. .
Moreover, as shown in Table3, DCI format 0D further comprises
the respective redundant versions of modulation-coding modes of
the two transmission blocks, at least part of the redundant version
of modulation-coding mode of the other transmission block, other
than the transmission block for the one-codeword retransmission,
of the two transmission blocks is utilized to represent pre-coding
matrix indicating information of channel coding codeword which
is mapped by the transmission block for the one-codeword
retransmission, so as to replace precoding matrix indicating field .
In other word, in DCI format 0D, PMI field may be unnecessary.
In step S204, generated downlink control information would be
transmitted to dual-antenna UE 12.
With reference to Figure 3 , there is illustrated a flowchart
of a method of providing, for a quadr i-antenna UE, downlink control
information used for uplink transmission in a management device
of enhanced LTE network according to one embodiment of the present
invention. First, in step S300, three uplink transmission modes
are predetermined, which are respectively : a first uplink
transmission mode, a second uplink transmission mode and a third
uplink transmission mode, as shown in Table4:
Table4: PDCCH and PUSCH for 4-Tx configured by C-RNTI
Wherein, in Table4, the first uplink transmission mode
corresponds to transmission of single-antenna port. The second
uplink transmission mode corresponds to transmission of
single-antenna port or closed-loop spatial multiplexing
transmission with up to two codewords. The third uplink transmission
mode corresponds to transmission of single-antenna port or
closed-loop spatial multiplexing transmission with single layer.
Wherein, after determining a corresponding transmission scheme
in step S301, in step S302, semi-stat ically configures, by high
level signaling, the uplink transmission mode to which the uplink
transmission scheme belongs. Subsequently, in step S303, the
downlink control information generated for single-port
transmission to be performed by multi-antenna UE, for example
quadri-antenna UE 13, has a format of downlink control information
with a numbering of 0 ; yet if quadri-antenna UE 13 is due to conduct
a closed-loop spatial multiplexing transmission with up to two
codewords, then the format of downlink control information
generated in step S303 will be as shown in Table 3 .
Wherein, when transmission block disabling function is adopted
in the determined uplink transmission scheme, disablement of at least
one of two transmission blocks is represented by a first value,
for example the value of 3 0 in binary form, of the precoding matrix
indicating field; and the disabled transmission block of the two
transmission blocks is represented by a combination of the new-data
indicating field for the first transmission block and the new-data
indicating field for the second transmission block.
The downlink control information, in the form of DCI format
0C, further comprises a TB-codeword mapping indicating field and
respective redundant version fields of modulation-coding modes
of the two transmission blocks, wherein, the redundant version
field of modulation-coding mode of the disabled transmission block
and the TB-codeword mapping indicating field are utilized to
collaboratively represent the pre-coding matrix information of
channel coding codeword which is mapped by the transmission block
without being disabled.
When one-codeword retransmission is used in the determined
uplink transmission scheme, the one-codeword retransmission, of
one transmission block of the both transmission blocks transmitted
last time, is represented by a second value, for example the value
of 3 1 in binary form, of the precoding matrix indicating field;
and the transmission block, with the one-codeword retransmission
conducted thereon, of the both transmission blocks transmitted
last time is represented by the combination formed by the new-data
indicating field for a first transmission block and the new-data
indicating field for a second transmission block.
Wherein, the redundant version field of modulation-coding mode
of the transmission block, without the one-codeword retransmission
conducted, and the TB-codeword mapping indicating field
collaboratively represent the pre-coding matrix of channel coding
codeword which is mapped by the transmission block for the
one-codeword retransmission.
In step S304, the generated downlink control information is
transmitted to the quadr i-antenna UE .
The optimized DCI format OD and OC, with different size, is
designed for case of two antennas and 4 antennas, with dynamic
rank adaptation and 1-CW retransmission supported. Different from
downlink transmission, antennas configuration of quadri-antenna
UE and dual-antenna UE of uplink transmission has a high dependency
of capability of UE . For 2-Tx, the precoding of 2-CW transmission
is an identity matrix due to its full-rank transmission. A s a
result, the PMI field is unnecessary for DCI format OD . While
for 4-Tx, the precoding of 2-CW transmission may not be full-rank
so that 5 to 6 bits PMI are needed. A s detailed in Section 3 ,
there are at least 4-bit payload difference between DCI format
OC and OD.
A s abovement ioned, according to one embodiment of the present
invention, separate DCI formats with different sizes may be
specified for 2-Tx and 4-Tx antenna UE, for example, the aforesaid
DCI format OD and DCI format OC.
In UL transmission mode 3 (UL TM3 ), DCI format OB is configured
for multiple-antenna ports with single-layer transmission, which
could be applicable for UL MU-MIMO and beamf orming . Since DCI format
OB needs to indicate the information for one TB only, then for
2-Tx there are at least 5-bit payload difference between DCI format
OB and OD while 7-bit difference in payload between DCI format
OB and OC.
According to one preferable embodiment of the present invention,
an additional RRC-conf igured UL transmission mode for single-layer
transmission scheme is specified, i.e., UL TM3 in table 2-3.
Since DCI format 0 is configured for all these three transmission
modes ,dynamic fallback to single-antenna port scheme is supported .
Hereinafter, further description will be made for the above
various UL DCI formats. Wherein, several agreements mentioned in
the background are also taken into account. And following
description aims partially at every field in the DCI format.
RB (Resource Block) assignment and hopping information
The hopping flag in DCI format 0 could be used for RB assignment
in case of non-contiguous RA . Although the number of clusters
is still open, the following two options could be provided
alternatively:
Scheme 1 : 2 clusters (with UL DCI format aligned with DCI format
0 )
Scheme 2 :Number of clusters not limited by the signalling (with
UL DCI format aligned with configured DL DCI formats)
According to one embodiment of the present invention, for the
above scheme 1 , UL DCI format RA field is aligned with DCI format
0 in terms of RA . Accordingly, the number of bits in this RA field
could be given by
= log ( ( +l)/2) +l ( i )
UL per-antenna/per-CW power control
According to one preferable embodiment of the present
invention, by an extension of Rel-8 UL power control to the case
of UL multiple-antenna ports without impacts on the existing single
TPC command, thereby, the control signalling overhead is reduced
as more as possible.
CS configuration for multiple layers
Although CS separation is the primary multiplexing scheme of
DM RS, wherein the CS configuration could be predefined, or
semi-static indicated by RRC signaling or dynamically indicated.
If it is agreed that PHICH resources for CWO and CW1 of UL MIMO
are identified by the associated CS index values, dynamic
configuration of CS for multiple layers is a little preferred with
better performance from the viewpoint of avoiding PHICH resource
collision .
Some dedicated definitions about D C I format 0D
1 . Necessity of PMI field
A s specified in TS36.211 [4] for LTE Rel-8 DL spatial
multiplexing, the case of a single CW mapped to two layers is only
applicable when the number of antenna ports is 4 . The same
CW-to- layer mapping principle is reused for LTE -A Rel-1 0 UL spatial
multiplexing. For 2-Tx, full-rank transmission with two layers
is only mapped from two CWs . Considering that the precoding of
full-rank transmission is an identity matrix as described in
TR36 .814 ,the PMI fieldinDCI format 0D for up to 2-TB is unnecessary .
2 . TB disabling indication
To support dynamic rank adaptation, new DCI formats for up to
2-TB have to support the scheduling of 1-TB enabled. Unlike in
the LTE Rel-8 DL, UL MCS and RV are jointly signaled in LTE-A Rel-10,
so that transmission block disabling can not be indicated by a
special combination of MCS=0 and RV=1 as in Rel-8 DL grant.
Consequently, according to one embodiment of the present invention,
an additional bit is introduced for indication of such content,
which may be named as a first indicating field and often occupy
1 bit. In addition, for the transmission or retransmission with
only one TB, the enabled TB could be always mapped to the first
codeword, for example CWO, which is as like as the case in LTE
Rel-8 DL . According to one embodiment of the present invention,
the TB-to-CW swap flag (Swap) could be used to differentiate TB
disabling and 1-CW retransmission functions. For example, for the
case of adoption of the TB disabling function, DCL format OD could
be designed based on the following:
If TBDI =0 and Swap =0 , at least one of the two TBs is disabled.
Moreover, the NDI for respective TB could be used to indicate the
disabled transmission block is disabled. E.g.:
( 1 ) If the new-data indicating field (NDI 1 ) of the first
transmission block equals 1 , the new-data indicating
field (NDI 2 ) of the second transmission block equal
0 , it is denoted that TBI is enabled and TB2 is
disabled ;
( 2 ) NDI1=0 and NDI2=1 denotes TBI is disabled and TB2
is enabled ;
( 3 ) NDI1=0, NDI2=0 and CQI request=l /SRS request=l
denotes both TBs are disabled while aperiodic CQI
and/or aperiodic SRS are transmitted.
Wherein, the enabled TB is always mapped to CWO, Then 3-bit
out of the MCS and RV field corresponding to the disabled TB could
be used to indicate the precoding matrix of enabled TB, so as to
functionally replace precoding matrix indicating field of the
enabled transmission block, and the remaining 2 bits may be
reserved .
3 . 1-CW retransmission
If TBDI =0 and Swap =l , one of the two TBs, transmitted last time,
is to be retransmitted and the other TB is terminated.
Furthermore, the NDI for respective TB could be used to indicate
which TB is due to conduct the 1-codeword retransmission, i.e.,
(1) NDI1 =0 and NDI2 =1 denotes only TBI is to be retransmitted;
(2) NDI1 =1 and NDI2 =0 denotes only TB2 is to be retransmitted;
wherein, the transmission block for 1-codeword retransmission
is always mapped to CWO, then 3-bit out of the MCS and RV field
corresponding to the terminated TB could be used to indicate the
precoding matrix of the transmission block for 1-codeword
retransmission and the remaining 2 bits are reserved.
some dedicated definition about D C I format C
1 . PMI field
For spatial multiplexing with 2-TB, the transmission ranks is
not less than 2 . The total number of precoding matrices for rank-2,
rank-3 and rank-4 is 29. Therefore, 5-bit PMI is sufficient for
representation of 2-TB transmission .However, 6-bit PMI fieldcould
be also defined to potentially support possible new codebook
2 . TB (Transmission Block) disabling indication
Even in the case of using 5-bit PMI field, there are 3 redundant
indices for reservation. So, one reserved index could be used
to represent the active TB disabling function with another one
reserved index denoting adoption of 1-CW retransmission function.
For example:
If PMI index, IPMI=30, then at least one of the two TBs is
disabled .
The NDI for respective TB could be used to further indicate
its corresponding TB is disabled. E.g.,
(1 ) NDI 1=1 and NDI 2=0denotes TBI is enabled and TB 2 is disabled,•
(2) NDI1=0 and NDI2=1 denotes TBI is disabled and TB2 is
enabled;
(3) NDI1=0, NDI2=0 and CQI request=l /SRS request=l denotes
both TBs are disabled while aperiodic CQI and/or aperiodic SRS
are transmitted
Wherein, the enabled TB(s) is always mapped to CWO .
Other meaning, different from precoding matrix, may be
represented if value of PMI field is set, for example to be 30,
3 1 .Therefore, the combination of 1-bit TB-to-CW mapping indication
and 5-bit MCS and RV field corresponding to the disabled TB could
be used to indicate the precoding matrix of the enabled transmission
block, which may indicate up to 64 precoding matrixes.
3 . 1-CW retransmission indication
For example, if PMI index, IPMI=31 (in binary mode) , one of the
two TBs, transmitted last time, is to be retransmitted. The NDI
for respective TB could be further used to indicate the TB due
to conduct the 1-CW retransmission, i.e.,
(1) NDI1 =0 and NDI2 =1 denotes only TBI is to be retransmitted;
(2) NDI1 =1 and NDI2 =0 denotes only TB2 is to be retransmitted;
wherein, the transmission block for 1-CW retransmission is
always mapped to CWO .Other meaning, diff erent fromprecoding matrix,
may be represented if value of PMI field is set, for example to
be 30, 31. Therefore, the combination of 1-bit TB-to-CW mapping
indicating field and 5-bit MCS and RV field of TB without 1-CW
retransmission loaded could be used to indicate theprecoding matrix
of the enabled transmission block for 1-CW codeword retransmission,
which may indicate up to 64 precoding matrixes.
some dedicated definition about DCI format OB
DCI format OB may be designed for 2-antenna and 4-antenna UE
and of which the content is as shown in Table 5 , and different
from DCI format 0D and 0C, the fields for TB-to-CW swap, MCS and
RV, as well as CS field of DM RS for second CW are may be omitted
in DCI format OB. Since there are 6 precoding vectors for
single-layer transmission for 2-Tx and 24 precoding vectors for
4-Tx, the PMI field may be designed to have 3-bit for 2-Tx and
5-bit for 4-Tx, respectively.
Table5: content for DCI format OB
CRC 16 16
Total Size (N +36) for FDD (N +38) for FDD
With Reference to Fig. 4, wherein there is illustrated a function
block diagram of a first device 4 of providing, for a dual-antenna
UE, downlink control information used for uplink transmission in
a management device of enhanced LTE network, the first device 4
is typically located in base station 1 1 shown in figure 1 , and
comprises :
a first unit 4 1 for determining an uplink transmission scheme
for the dual-antenna UE, which corresponds to Step S201 as shown
in Fig .2;
a second unit 42 for semi-stat ically configuring, by high level
signaling, the uplink transmission mode to which the uplink
transmission scheme belongs, which corresponds to Step S202 as
shown in Fig .2;
a third unit 43 for generating downlink control information
corresponding to the determined uplink transmission scheme, the
downlink control information comprising a first indicating field,
a second indicating field, a new-data indicating field for a first
transmission block and a new-data indicating field for a second
transmission block, which corresponds to Step S203 as shown in
Fig. 2;
Wherein, when transmission block disabling function is adopted
in the determined uplink transmission scheme, disablement of at
least one of two transmission blocks is represented by a first
combination of the values of the first indicating field and the
second indicating field; and the disabled transmission block of
the two transmission blocks is represented by a combination formed
by the new-data indicating field for the first transmission block
and the new-data indicating field for the second transmission block;
a first transmitting device 44 for transmitting the generated
downlink control information to the dual-antenna UE, which
corresponds to Step S204 as shown in Fig. 2 .
Moreover, the downlink control information further comprises
respective redundant versions of modulation-coding modes of the
two transmission blocks; when a transmission block is disabled
in the determined uplink transmission scheme, at least part of
the redundant version for modulation-coding mode of the disabled
transmission block is utilized to represent pre-coding matrix
indicating information of channel coding codeword which is mapped
by the transmission block without being disabled, so as to replace
precoding matrix indicating field; or,
When one-codeword retransmission is used in the determined
uplink transmission scheme, the one-codeword retransmission, of
one transmission block of the both transmission blocks transmitted
last time, is represented by a second combination formed by the
values of the first indicating field and the second indicating
field, and the transmission block, for the one-codeword
retransmission, of the both transmission blocks is represented
by the combination formed by the new-data indicating field for
a first transmission block and the new-data indicating field for
a second transmission block.
And still furthermore, the downlink control information further
comprises respective redundant versions for modulation-coding
modes of the two transmission blocks, at least part of the redundant
version for modulation -coding mode of the other transmission block,
other than the transmission block for the one-codeword
retransmission, of the two transmission blocks is utilized to
represent pre-coding matrix indicating information of channel
coding codeword which is mapped by the transmission block for the
one-codeword retransmission, so as to replace precoding matrix
indicating field.
With reference to Figure 5 , wherein there is illustrated a
function block diagram of a second device 5 of providing, for a
quadri-antenna UE, downlink control information used for uplink
transmission in a management device of enhanced LTE network, the
second device 5 is typically located in base station 11, and
comprises :
a fourth unit 5 1 for determining an uplink transmission scheme
for the quadri-antenna UE which corresponds to Step S301 as shown
in Fig.3;
a fifth unit 52 for semi-stat ically configuring, by high level
signaling, the uplink transmission mode to which the uplink
transmission scheme belongs, which corresponds to Step S302 as
shown in Fig.3;
a sixth unit 53 for generating downlink control information
corresponding to the determined uplink transmission scheme, the
downlink control information comprising a precoding matrix
indicating field, and further comprising a new-data indicating
field for a first transmission block and a new-data indicating
field for a second transmission block, which corresponds to Step
S303 as shown in Fig.3;
Wherein, when transmission block disabling function is adopted
in the determined uplink transmission scheme, disablement of at
least one of two transmission blocks is represented by a first
value, for example 3 0 in binary form, of the precoding matrix
indicating field; and the disabled transmission block of the two
transmission blocks is represented by a combination of the new-data
indicating field for the first transmission block and the new-data
indicating field for the second transmission block;
the downlink control information further comprises a
TB-codeword mapping indicating field and respective redundant
version fields of modulation-coding modes of the two transmission
blocks, wherein, the TB-codeword mapping indicating field and the
redundant version field of modulation-coding mode of the disabled
transmission block collaboratively represent the pre-coding
matrix of channel coding codeword which is mapped by the
transmission block without being disabled;
a second transmitting device 54 for transmitting the generated
downlink control information to the multi-antenna UE, which
corresponds to Step S304 as shown in Fig. 3 .
Moreover, when one-codeword retransmission is used in the
determined uplink transmission scheme, the one-codeword
retransmission, of one transmission block of the both transmission
blocks, is represented by a second value, for example 3 1 in binary
form, of the precoding mat rix indicating field; and the transmission
block, with the one-codeword retransmission conducted thereon,
of the both transmission blocks is represented by the combination
formed by the new-data indicating field for a first transmission
block and the new-data indicating field for a second transmission
block ;
wherein, the TB-codeword mapping indicating field and the
redundant version field of modulation-coding mode of the
transmission block, without the one-codeword retransmission
conducted, collaboratively represent the pre-coding matrix of
channel coding codeword which is mapped by the transmission block
for the one-codeword retransmission.
For those skilled in the art, it is apparent that the present
invention is not limited to the details of above exemplary
embodiments, and the present invention may be carried out in other
specific form without departing from the basic feature or spirit
of the present invention .Therefore, anyway, the embodiments should
be deemed to be exemplary and non-limited, the scope of the present
invention is defined by appended claims instead of the above
description, thereby with the intention that all the variations
falling within the meaning and scope of the equivalent of claims
are construed to be within the coverage of the present invention.
None of the Figure numbers in the claims should be deemed as a
limitation to the relevant claim (s) . Additionally, apparently,
the word of "comprise" does not exclude the existence of other
unit, and the case of singular number does not exclude the case
of plural number. Such word as 'a first', 'a second', is merely
used for representing a name, instead of particular order.
What is claimed is:
1 . A method of providing, for a dual-antenna UE ,downlink control
information used for uplink transmission in a management device
of LTE-A network, the method comprising the steps of:
determining an uplink transmission scheme for said dual-antenna
UE;
semi-stat ically configuring, by high level signaling, an uplink
transmission mode to which said uplink transmission scheme belongs ;
generating downlink control information corresponding to said
determined uplink transmission scheme, said downlink control
information comprising a first indicating field, a second
indicating field, a new-data indicating field for a first
transmission block and a new-data indicating field for a second
transmission block;
wherein, when transmission block disabling function is adopted
in said determined uplink transmission scheme, a first combination
formed by the values of said first indicating field and said second
indicating field is used to represent disablement of at least one
of two transmission blocks; and a combination formed by said
new-data indicating field for said first transmission block and
said new-data indicating field for said second transmission block
is used to represent the disabled transmission block of said two
transmission blocks;
transmitting said generated downlink control information to
said dual-antenna UE .
2 . The method according to claim 1,wherein, said downlink control
information further comprises respective redundant versions of
modulation-coding modes of said two transmission blocks; when a
transmission block is disabled in the determined uplink
transmission scheme, at least part of the redundant version of
modulation-coding mode of said disabled transmission block is
utilized to represent pre-coding matrix indicating information
of channel coding codeword which is mapped by the transmission
block without being disabled, so as to replace a precoding matrix
indicating field.
3 . The method according to claim 1 , wherein, when one-codeword
retransmission is used in said determined uplink transmission
scheme, a second combination formed by the values of said first
indicating field and said second indicating field is used to
represent the one-codeword retransmission of one transmission
block of the two transmission blocks transmitted last time, and
the combination formed by said new-data indicating field for said
first transmission block and said new-data indicating field for
said second transmission block is used to represent the transmission
block, with said one-codeword retransmission conducted thereon,
of said two transmission blocks.
4 . The method according to claim 3,wherein, said downlink control
information further comprises respective redundant versions of
modulation-coding modes of said two transmission blocks, at least
part of the redundant version of modulation-coding mode of the
other transmission block, other than said transmission block with
said one-codeword retransmission conducted, of said two
transmission blocks is utilized to represent pre-coding matrix
indicating information of channel coding codeword which is mapped
by said transmission block with said one-codeword retransmission
conducted, so as to replace a precoding matrix indicating field.
5.A method of providing, for amult i-antenna UE ,downlink control
information used for uplink transmission in a management device
of LTE-A network, the method comprising the steps of:
determining an uplink transmission scheme for said
multi-antenna UE ;
semi-stat ically configuring, by high level signaling, the
uplink transmission mode to which said uplink transmission scheme
belongs ;
generating downlink control information corresponding to said
determined uplink transmission scheme, said downlink control
information comprising a precoding matrix indicating field, and
further comprising a new-data indicating field for a first
transmission block and a new-data indicating field for a second
transmission block;
wherein, when transmission block disabling function is adopted
in said determined uplink transmission scheme, a first value of
said precoding matrix indicating field is used to represent
disablement of at least one of two transmission blocks; and a
combination of said new-data indicating field for said first
transmission block and said new-data indicating field for said
second transmission block is used to represent the disabled
transmission block of said two transmission blocks;
said downlink control information further comprises respective
redundant version fields of modulation-coding modes of said two
transmission blocks, wherein, the redundant version field of
modulation-coding mode of said disabled transmission block is
utilized to represent the pre-coding matrix information of channel
coding codeword which is mapped by the transmission block without
being disabled;
transmitting said generated downlink control information to
said multi-antenna UE .
6 . The method according to claim 5 , wherein, when one-codeword
retransmission is used in said determined uplink transmission
scheme, a second value of said precoding matrix indicating field
is used to represent the one-codeword retransmission of one
transmission block of the two transmission blocks transmitted last
time; and the combination formed by said new-data indicating field
for said first transmission block and said new-data indicating
field for said second transmission block is used to represent the
transmission block, with said one-codeword retransmission
conducted thereon, of said two transmission blocks;
wherein, the redundant version field of modulation-coding mode
of said transmission block, without said one-codeword
retransmission conducted, represents the pre-coding matrix of
channel coding codeword which is mapped by the transmission block
with said one-codeword retransmission conducted.
7.A method of providing, for a dual -antenna UE, downlink control
information used for uplink transmission in a management device
of LTE-A network, the method comprising the steps of:
determining an uplink transmission scheme for said dual-antenna
UE;
semi-stat ically configuring, by high level signaling, the
uplink transmission mode to which said uplink transmission scheme
belongs ;
generating downlink control information corresponding to said
determined uplink transmission scheme, wherein, when said uplink
transmission scheme is of a closed-loop spatial multiplexing
transmission with up to two codewords, said downlink control
information comprises:
a resource block assignment and hopping information field;
a transmission block disabling indicating field;
a TB-codeword mapping indicating field;
a redundant version field of modulation-coding mode of every
transmission block;
a new-data indicating field of every transmission block;
a transmission power control field;
a cycle shift field for demodulation reference signal
corresponding to a first channel coding codeword;
a CQI request field;
a SRS request field;
a CIF field;
an UL index field for TDD only;
a CRC field;
transmitting said generated downlink control information to
said dual-antenna UE .
8.A method of providing, for amult i-antenna UE ,downlink control
information used for uplink transmission in a management device
of LTE-A network, the method comprising the steps of:
determining an uplink transmission scheme for said
multi-antenna UE ;
semi-stat ically configuring, by high level signaling, the
uplink transmission mode to which said uplink transmission scheme
belongs ;
generating downlink control information corresponding to said
determined uplink transmission scheme, wherein, when said uplink
transmission scheme is of a closed-loop spatial multiplexing
transmission with up to two codewords, said downlink control
information comprises:
a resource block assignment and hopping information field;
a precoding matrix indicating field;
a TB-codeword mapping indicating field;
a redundant version field of modulation-coding mode of every
transmission block;
a new-data indicating field of every transmission block;
a transmission power control field;
a cycle shift field for demodulation reference signal
corresponding to a first channel coding codeword;
a CQI request field;
a SRS request field;
a CIF field;
an UL index field for TDD only;
a CRC field;
transmitting said generated downlink control information to
said multi-antenna UE .
9 . A method of providing, for a multi-antenna UE, downlink
control information used for uplink transmission in a management
device of LTE-A network, the method comprising the steps of:
determining an uplink transmission scheme for said
multi-antenna UE ;
semi-stat ically configuring, by high level signaling, the
uplink transmission mode to which said uplink transmission scheme
belongs ;
generating downlink control information corresponding to said
determined uplink transmission scheme, wherein, when said uplink
transmission scheme is of a closed-loop spatial multiplexing
transmission with single layer, said downlink control information
comprises :
a resource block assignment and hopping information field;
a precoding matrix indicating field;
a redundant version field of modulation-coding mode of every
transmission block;
a new-data indicating field of every transmission block;
a transmission power control field;
a cycle shift field for demodulation reference signal
corresponding to a channel coding codeword;
a CQI request field;
a SRS request field;
a CIF field;
an UL index field for TDD only;
a CRC field;
transmitting said generated downlink control information to
said multi-antenna UE .
10. A method of controlling uplink transmission of a UE in a
management device of LTE-A network , wherein, said method comprises
the steps of:
predetermining three uplink transmission modes for said UE,
said three uplink transmission mode comprising a first uplink
transmission mode, a second uplink transmission mode and a third
uplink transmission mode, wherein:
said first uplink transmission mode corresponds to
single-antenna port transmission;
said second uplink transmission mode corresponds to
single-antenna port transmission or closed-loop spatial
multiplexing transmission with up to two codewords;
said third uplink transmission mode corresponds to
single-antenna port transmission or closed-loop spatial
multiplexing transmission with single layer;
when said UE is a dual-antenna UE, downlink control information
provided for closed-loop spatial multiplexing transmission with
up to two codewords to be conducted by said UE has a format as
recited in claim 7 ; or
when said UE is a multi-antenna UE other than dual-antenna UE,
downlink control information provided for closed-loop spatial
multiplexing transmission with up to two codewords to be conducted
by said UE has a downlink control information format as recited
in claim 8.
11. A fir st device of providing, for a dual-antenna UE , downlink
control information used for uplink transmission in a management
device of LTE-A network, the first device comprising:
a first unit for determining an uplink transmission scheme for
said dual-antenna UE ;
a second unit for semi-stat ically configuring, by high level
signaling, the uplink transmission mode to which said uplink
transmission scheme belongs;
a third unit for generating downlink control information
corresponding to said determined uplink transmission scheme, said
downlink control information comprising a first indicating field,
a second indicating field, a new-data indicating field for a first
transmission block and a new-data indicating field for a second
transmission block;
wherein, when transmission block disabling function is adopted
in said determined uplink transmission scheme, the disablement
of at least one of two transmission blocks is represented by a
first combination formed by the values of said first indicating
field and said second indicating field; and the disabled
transmission block of said two transmission blocks is represented
by a combination formed by said new-data indicating field for said
first transmission block and said new-data indicating field for
said second transmission block;
a first transmitting device for transmitting said generated
downlink control information to said dual-antenna UE .
12. The first device according to claim 11, wherein, said
downlink control information further comprises respective
redundant versions of modulation-coding modes of said two
transmission blocks; when a transmission block is disabled in the
determined uplink transmission scheme, at least part of the
redundant version of modulation-coding mode of said disabled
transmission block is utilized to represent pre-coding matrix
indicating information of channel coding codeword which is mapped
by the transmission block without being disabled, so as to replace
a precoding matrix indicating field; or,
when one-codeword retransmission is used in said determined
uplink transmission scheme, the one-codeword retransmission, of
one transmission block of the two transmission blocks transmitted
last time, is represented by a second combination formed by the
values of said first indicating field and said second indicating
field, and the transmission block, with said one-codeword
retransmission conducted thereon, of said two transmission blocks
is represented by the combination formed by said new-data indicating
field for said first transmission block and said new-data indicating
field for said second transmission block.
13. The first device according to claim 12, wherein, said
downlink control information further comprises respective
redundant versions of modulation-coding modes of said two
transmission blocks, at least part of the redundant version of
modulation-coding mode of the other transmission block, other than
said transmission block with said one-codeword retransmission
conducted, of said two transmission blocks is utilized to represent
pre-coding matrix indicating information of channel coding
codeword which is mapped by said transmission block with said
one-codeword retransmission conduct, so as to replace a precoding
matrix indicating field.
14. A second device of providing, for a quadr i-antenna UE,
downlink control information used for uplink transmission in a
management device of LTE-A network, the second device comprising:
a fourth unit for determining an uplink transmission scheme
for said quadr i-antenna UE ;
a fifth unit for semi-stat ically configuring, by high level
signaling, the uplink transmission mode to which said uplink
transmission scheme belongs;
a sixth unit for generating downlink control information
corresponding to said determined uplink transmission scheme, said
downlink control information comprising a precoding matrix
indicating field, and further comprising a new-data indicating
field for a first transmission block and a new-data indicating
field for a second transmission block;
wherein, when transmission block disabling function is adopted
in said determined uplink transmission scheme, disablement of at
least one of two transmission blocks is represented by a first
value of said precoding matrix indicating field; and the disabled
transmission block of said two transmission blocks is represented
by a combination of said new-data indicating field for said first
transmission block and said new-data indicating field for said
second transmission block;
said downlink control information further comprises respective
redundant version fields of modulation-coding modes of said two
transmission blocks, wherein, the TB-codeword mapping indicating
field and the redundant version field of modulation-coding mode
of said disabled transmission block collaboratively represent the
pre-coding matrix of channel coding codeword which is mapped by
the transmission block without being disabled;
a second transmitting device for transmitting said generated
downlink control information to said multi-antenna UE .
15. The second device according to claim 14, wherein, when
one-codeword retransmission is used in said determined uplink
transmission scheme, the one-codeword retransmission, of one
transmission block of the two transmission blocks transmitted last
time, is represented by a second value of said precoding matrix
indicating field; and the transmission block, with said
one-codeword retransmission conducted thereon, of said two
transmission blocks transmitted last time is represented by the
combination formed by said new-data indicating field for said first
transmission block and said new-data indicating field for said
second transmission block;
wherein, the redundant version field of modulation-coding mode
of said transmission block, without said one-codeword
retransmission conducted, represents the pre-coding matrix of
channel coding codeword which is mapped by the transmission block
with said one-codeword retransmission conducted.