NZ621393B2 - Terminal, base station, communications system, and communication method - Google Patents
Terminal, base station, communications system, and communication method Download PDFInfo
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- NZ621393B2 NZ621393B2 NZ621393A NZ62139312A NZ621393B2 NZ 621393 B2 NZ621393 B2 NZ 621393B2 NZ 621393 A NZ621393 A NZ 621393A NZ 62139312 A NZ62139312 A NZ 62139312A NZ 621393 B2 NZ621393 B2 NZ 621393B2
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- 238000004891 communication Methods 0.000 title claims description 15
- 230000004044 response Effects 0.000 claims abstract description 83
- 230000005540 biological transmission Effects 0.000 claims description 39
- 238000001514 detection method Methods 0.000 claims description 12
- 230000005465 channeling Effects 0.000 claims 2
- 230000000875 corresponding Effects 0.000 abstract description 38
- 230000011664 signaling Effects 0.000 description 17
- 230000000051 modifying Effects 0.000 description 13
- 238000000034 method Methods 0.000 description 12
- 230000002776 aggregation Effects 0.000 description 10
- 238000004220 aggregation Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000000284 extract Substances 0.000 description 9
- 125000004122 cyclic group Chemical group 0.000 description 8
- 101710040583 Pbsn Proteins 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 229940035295 Ting Drugs 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 6
- 239000000969 carrier Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000001174 ascending Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 101700081364 PRAG1 Proteins 0.000 description 1
- NRNCYVBFPDDJNE-UHFFFAOYSA-N Pemoline Chemical compound O1C(N)=NC(=O)C1C1=CC=CC=C1 NRNCYVBFPDDJNE-UHFFFAOYSA-N 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 230000003287 optical Effects 0.000 description 1
- 230000003595 spectral Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2612—Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0055—ZCZ [zero correlation zone]
- H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1861—Physical mapping arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
-
- H04W72/0413—
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Abstract
The present invention is a terminal (102) for communicating with a base station (101) monitors a physical downlink control channel (104) positioned in a physical downlink control channel region, and an enhanced physical downlink control channel (103) positioned in a physical downlink shared channel region that differs from the physical downlink control channel region. When an enhanced physical downlink control channel (103) is detected, the terminal reports response information via a physical uplink control channel (105) resource corresponding to the resource in which the enhanced physical downlink control channel was detected. region that differs from the physical downlink control channel region. When an enhanced physical downlink control channel (103) is detected, the terminal reports response information via a physical uplink control channel (105) resource corresponding to the resource in which the enhanced physical downlink control channel was detected.
Description
DESCRIPTION
Title of Invention: TERMINAL, BASE STATION, ICATIONS
SYSTEM, AND COMMUNICATION METHOD
cal Field
The present invention relates to a terminal, base
station, communications system, and communication method.
Background Art
In wireless communications s such as Long Term
Evolution (LTE) and LTE-Advanced (LTE—A) defined by Third
Generation Partnership Project (3GPP), wireless LAN defined
by The Institute of Electrical and onics engineers
(IEEE), and Worldwide Interoperability for Microwave Access
(WiMAX), a base station (a base station device, downlink
transmitting , uplink receiving device, eNodeB) and a
terminal (terminal device, mobile station device, downlink
receiving device, uplink transmitting device, UE) include
multiple transmit/receive antennas and use multi—input
output (MIMO) technology to spatially multiplex data
signals and achieve high—speed data communications. In LTE
and LTE—A in particular, the orthogonal ncy division
multiplexing (OFDM) scheme is employed in the downlink to
achieve high spectral efficiency and the single carrier—
frequency division multiple access (SC—FDMA) scheme is used
in the uplink to reduce peak power. Furthermore, hybrid ARQ
(HARQ), which combines automatic repeat request (ARQ) with
error tion codes, has been adopted.
Fig. 25 shows a configuration of an LTE communications
system implementing HARQ. In Fig. 25, a base station 2501
notifies a terminal 2502 of control information ated
with downlink transmit data 2504 over a physical downlink
control channel (PDCCH) 2503. The terminal 2502 first
performs detection of control information. If control
ation is detected, the terminal 2502 uses it to
extract downlink transmit data 2504. After detecting the
control information, the terminal 2502 reports HARQ response
information indicating whether the downlink transmit data
2504 has been successfully extracted or not to the base
station 2501 over a physical uplink control l )
2505. Here, a resource for the PUCCH 2505 (PUCCH resource)
available for the terminal 2502 is implicitly/tacitly and
uniquely determined by the resource for the PDCCH 2503 to
which the control information is ed. The terminal
2502 thus can use a dynamically assigned PUCCH resource when
reporting HARQ response information. It is also possible to
prevent overlap of PUCCH resources among terminals (see Non
Patent Literatures l and 2).
Citation List
Non Patent Literature
NPL 1: 3rd Generation Partnership Project; Technical
Specification Group Radio Access Network; Evolved Universal
Terrestrial Radio Access (E—UTRA); al ls and
Modulation (Release 10), June 2011, 3GPP TS 36.211 V10.2.0
NPL 2: 3rd Generation rship Project; Technical
Specification Group Radio Access Network; Evolved Universal
Terrestrial Radio Access (E—UTRA); Physical layer procedures
(Release 10), June 2011, 3GPP TS 36.213 V10.2.0 (2011—06)
Summary of Invention
Technical Problem
In order to increase the number of terminals that can
be covered by a base station in a wireless communications
system e of HARQ, enhanced physical downlink control
channel can be used in addition to physical downlink control
channel. With the conventional scheme for specifying
physical uplink control channel ces, physical uplink
control channel resources cannot be specified between the
base station and the terminal when a base station transmits
l information over an enhanced physical downlink
control channel, which hampers ement in transmission
efficiency.
The present invention has been made in view of the
problem, and an object thereof is to provide a base station,
al, communications , and communication method
for, in a wireless communications system in which a base
station and a terminal communicates with each other,
allowing physical uplink control l resources to be
efficiently specified even in a case where the base station
notifies the terminal of control information not only over a
al downlink control channel but an enhanced al
downlink control channel.
Solution to Problem
(1) According to an aspect of the invention, there is
provided a terminal apparatus that is ured to and/or
programmed to communicate with a base station apparatus,
the terminal apparatus comprising:
a downlink control channel detecting unit
configured to and/or programmed to detect an Enhanced
Physical Downlink Control Channel (EPDCCH), and
a response transmitting unit configured to and/or
programmed to it Hybrid Automatic Repeat reQuest
(HARQ) response information using a first Physical Uplink
l Channel (PUCCH) resource for a Physical Downlink
Shared CHannel (PDSCH) transmission indicated by a
detection of the EPDCCH,
the first PUCCH resource being determined on the
basis of at least a lowest element index used to construct
the EPDCCH and a first value which is determined, within a
plurality of values, from a field in downlink control
information of the EPDCCH.
(2) The first PUCCH resource included in the terminal
apparatus according to an aspect of the invention is
determined further on the basis of at least a second value
which is ured by a dedicated Radio Resource Control
(RRC) signal.
(3) The first PUCCH resource included in the terminal
apparatus according to an aspect of the invention is
determined further on the basis of at least a third value
which is ined from an a port used for the EPDCCH
transmission.
(4) The first PUCCH resource included in the terminal
apparatus according to an aspect of the ion is
determined further on the basis of at least a second value
which is configured by a dedicated Radio Resource Control
(RRC) signal and a third value which is determined from an
antenna port used for the EPDCCH transmission.
(5) The downlink control channel detecting unit
included in the terminal apparatus according to an aspect
of the ion is further configured to and/or programmed
to detect a Physical Downlink Control CHannel (PDCCH), and
the response transmitting unit is further
configured to and/or programmed to transmit HARQ response
information using a second PUCCH resource for a PDSCH
transmission indicated by a detection of the PDCCH,
the second PUCCH ce being determined on the
basis of at least a lowest element index used to construct
the PDCCH and a fourth value which is common in a cell.
(6) The lowest t index used to uct the
EPDCCH ed in the terminal apparatus according to an
aspect of the invention is an index of an initial element
among one or a plurality of elements used to construct the
EPDCCH.
(7) According to an aspect of the invention, there is
provided a base station apparatus that is ured to
and/or programmed to communicate with a terminal apparatus,
the base station apparatus comprising:
a physical control information notification unit configured
to and/or programmed to transmit an Enhanced Physical
Downlink l Channel (EPDCCH), and
a response information receiving unit configured to and/or
mmed to receive Hybrid Automatic Repeat reQuest
(HARQ) response information using a first Physical Uplink
Control Channel (PUCCH) resource for a al Downlink
Shared CHannel (PDSCH) transmission associated with the
EPDCCH,
the first PUCCH resource being determined on the basis of
at least a lowest element index used to construct the
EPDCCH and a first value which is determined, within a
plurality of values, from a field in downlink l
information of the EPDCCH.
(8) The first PUCCH resource included in the base
station apparatus according to an aspect of the invention
is determined further on the basis of at least a second
value which is ured by a dedicated Radio Resource
Control (RRC) signal.
(9) The first PUCCH resource included in the base
station apparatus according to an aspect of the invention
is determined further on the basis of at least a third
value which is determined from an antenna port used for the
EPDCCH ission.
(10) The first PUCCH resource included in the base
station apparatus according to an aspect of the invention
is determined further on the basis of at least a second
value which is configured by a dedicated Radio Resource
Control (RRC) signal and a third value which is determined
from an antenna port used for the EPDCCH transmission.
(11) The physical control information notification
response ation receiving unit included in the base
station tus ing to an aspect of the invention
is further configured to and/or programmed to transmit a
Physical nk Control CHannel (PDCCH), and
the response information receiving unit is further
configured to and/or programmed to receive HARQ response
information using a second PUCCH resource for a PDSCH
transmission associated with the PDCCH,
the second PUCCH resource being determined on the basis of
at least a lowest element index used to construct the
PDCCH and a fourth value which is common in a cell.
(12) The lowest element index used to construct the
EPDCCH in the base station apparatus according to an aspect
of the invention is an index of an initial element among
one or a plurality of elements used to construct the
EPDCCH.
(13) ing to an aspect of the ion, there is
provided an integrated t used in a al apparatus
that is configured to and/or programmed to communicate with
a base station apparatus, the integrated circuit
comprising:
a downlink control channel detecting unit configured to
and/or programmed to detect an Enhanced Physical Downlink
Control Channel (EPDCCH), and
a response transmitting unit configured to and/or
mmed to transmit Hybrid Automatic Repeat reQuest
(HARQ) response information using a Physical Uplink Control
Channel (PUCCH) resource for a Physical Downlink Shared
CHannel (PDSCH) transmission indicated by a detection of
the EPDCCH,
the PUCCH resource being determined on the basis of at
least a lowest t index used to construct the EPDCCH
and a value which is determined, within a plurality of
values, from a field in downlink control information of the
(14) According to an aspect of the invention, there is
provided an integrated circuit used in a base station
tus that is configured to and/or mmed to
communicate with a terminal apparatus, the integrated
circuit sing:
a physical control information notification unit configured
to and/or programmed to transmit an Enhanced Physical
Downlink Control Channel (EPDCCH), and
a se ation receiving unit configured to and/or
programmed to receive Hybrid Automatic Repeat reQuest
(HARQ) response information using a Physical Uplink Control
Channel (PUCCH) resource for a Physical Downlink Shared
CHannel (PDSCH) transmission associated with the EPDCCH,
the PUCCH resource being determined on the basis of at
least a lowest element index used to construct the EPDCCH
and a value which is determined, within a plurality of
values, from a field in downlink l information of the
EPDCCH.
(15) According to an aspect of the invention, there
is provided a communication method used by a terminal
apparatus that is configured to and/or programmed to
communicate with a base station apparatus, the
communication method comprising:
detecting an Enhanced Physical Downlink l Channel
(EPDCCH), and
transmitting Hybrid Automatic Repeat reQuest (HARQ)
response ation using a Physical Uplink Control
Channel (PUCCH) resource for a Physical Downlink Shared
CHannel (PDSCH) transmission indicated by a detection of
the EPDCCH,
the PUCCH resource being determined on the basis of at
least a lowest element index used to construct the EPDCCH
and a value which is determined, within a plurality of
values, from a field in downlink l information of
the .
[0021A]
(16) According to an aspect of the invention, there
is provided a communication method used by a base station
apparatus that is configured to and/or programmed to
communicate with a terminal apparatus, the communication method
comprising:
transmitting an ed Physical Downlink Control Channel
(EPDCCH), and
receiving Hybrid Automatic Repeat reQuest (HARQ) se
information using a Physical Uplink Control Channel (PUCCH)
resource for a Physical Downlink Shared CHannel (PDSCH)
transmission associated with the EPDCCH,
the PUCCH resource being determined on the basis of at least a
lowest element index used to construct the EPDCCH and a value
which is determined, within a plurality of values, from a field
in downlink control information of the EPDCCH.
Advantageous Effects of Invention
ing to the present invention, in a ss
communications system in which a base station and a terminal
communicate with each other, physical uplink control channel
resources can be efficiently specified even in a case where
the base station notifies the terminal of control
information not only over a physical downlink control
channel but an enhanced physical nk control channel.
Brief Description of Drawings
[Fig. 1] Fig. 1 shows an exemplary configuration of a
ications system according to a first embodiment of the
present invention.
[Fig. 2] Fig. 2 shows an exemplary structure of a radio
frame for the downlink according to the first embodiment.
[Fig. 3] Fig. 3 shows an ary structure of a radio
frame for the uplink according to the first embodiment.
[Fig. 4] Fig. 4 is a schematic block diagram showing an
exemplary configuration of a base station according to the
first embodiment.
[Fig. 5] Fig. 5 is a schematic block diagram g an
exemplary configuration of a terminal according to the first
embodiment.
[Fig. 6] Fig. 6 shows the structure of physical uplink
resource blocks in an uplink l l region to which
a PUCCH is assigned in the first embodiment.
[Fig. 7] Fig. 7 is a correspondence table showing
uplink control channel logical resources in the first
embodiment.
[Fig. 8] Fig. 8 shows physical resource blocks PRB and
virtual resource blocks VRB in PDCCH and PDSCH regions in
the first embodiment.
[Fig. 9] Fig. 9 shows an example of PRB—VRB mapping in
E—PDCCH and PDSCH regions in the first embodiment.
[Fig. 10] Fig. 10 shows another example of PRB—VRB
mapping in E—PDCCH and PDSCH regions in the first embodiment.
[Fig. 11] Fig. 11 shows an exemplary ing of VRBs
in an E-PDCCH region in the first embodiment.
[Fig. 12] Fig. 12 illustrates the structure of PDCCH
and assignment of PUCCH ces in the first embodiment.
[Fig. 13] Fig. 13 illustrates the ure of E—PDCCH
and assignment of PUCCH resources in the first embodiment.
[Fig. 14] Fig. 14 illustrates the structure of E—PDCCH
and assignment of PUCCH resources in the first embodiment.
[Fig. 15] Fig. 15 illustrates the structure of E—PDCCH
and assignment of PUCCH resources in the first embodiment.
[Fig. 16] Fig. 16 shows the flow of a downlink data
transmission and response procedure between the base station
and the terminal according to the first embodiment.
[Fig. 17] Fig. 17 illustrates the structure of E—PDCCH
and assignment of PUCCH resources in the first embodiment.
[Fig. 18] Fig. 18 rates the ure of E-PDCCH
and assignment of PUCCH resources in the first embodiment.
[Fig. 19] Fig. 19 illustrates the structure of E—PDCCH
and assignment of PUCCH ces in the first ment.
[Fig. 20] Fig. 20 illustrates the structure of E-PDCCH
and assignment of PUCCH resources in the first embodiment.
[Fig. 21] Fig. 21 shows the flow of a downlink data
transmission and response procedure n the base station
and the terminal according to a second embodiment of the
invention.
[Fig. 22] Fig. 22 is a table showing correspondence
between slots and the shift value in the second embodiment.
[Fig. 23] Fig. 23 shows the flow of a downlink data
transmission and response procedure between the base station
and the terminal according to a third embodiment of the
invention.
[Fig. 24] Fig. 24 is a table g correspondence
between indices and the shift value in the third embodiment.
[Fig. 25] Fig. 25 shows an exemplary configuration of a
communications system.
Description of Embodiments
-16...
(First Embodiment)
A first embodiment of the present invention is
described below. A communications system according to the
first embodiment includes a base station (base station
device, downlink transmitting device, uplink receiving
device, eNodeB) and a terminal (terminal device, mobile
station device, downlink ing device, uplink
transmitting device, UE).
Fig. 1 shows an exemplary configuration of the
communications system according to the first ment. In
Fig. 1, a base station 101 notifies a al 102 of
control information associated with downlink transmit data
104 over a PDCCH and/or an enhanced physical downlink
control channel (E—PDCCH) 103. The terminal 102 first
performs detection of l information. If control
information is detected, the terminal 102 uses it to t
downlink transmit data 104. After ing the control
information, the al 102 reports HARQ response
ation (also referred to as "Ack/Nack") indicating
whether the downlink transmit data 104 has been successfully
extracted or not to the base station 101 over a PUCCH. If
the terminal 102 detects control information on the PDCCH, a
resource for the physical uplink control channel (PUCCH) 105
available for the terminal 102 is implicitly/tacitly and
uniquely determined from the resource for the PDCCH in which
the control information was assigned. If the terminal 102
detects control information in the E—PDCCH 103, the resource
for the PUCCH 105 available for the terminal 102 is
implicitly/tacitly and uniquely determined from the resource
of the E—PDCCH 103 to which the control information is
Fig. 2 shows an exemplary structure of a radio frame
for the downlink according to this ment. In the
downlink, the OFDM access scheme is employed. In the
nk, PDCCH, physical downlink shared channel (PDSCH),
and so forth are assigned. A downlink radio frame consists
of a pair of downlink resource blocks (RBs). The downlink
RB pair is a unit used such as for assigning nk radio
resources, consisting of a frequency band of a predetermined
width (RB bandwidth) and a time slot (two one
subframe). A downlink RB pair consists of two downlink RBs
that are continuous in time domain (RB bandwidth x . A
downlink RB consists of twelve rriers in frequency
domain and seven OFDM symbols in time domain. A region that
is defined by one sub—carrier in frequency domain and one
OFDM symbol in time domain is called a resource element (RE).
A physical downlink control channel is a physical channel on
which downlink control information such as terminal device
identifier, scheduling ation for a physical downlink
shared channel, scheduling information for a physical uplink
shared channel, tion scheme, coding rate, and
retransmission parameters are transmitted. While nk
subframes in one component carrier (CC) are discussed herein,
downlink subframes are defined for each CC and downlink
subframes are substantially in synchronization with each
other among CCs.
Fig. 3 shows an exemplary structure of an uplink radio
frame according to this embodiment. In the uplink, the SC—
FDMA scheme is employed. In the uplink, physical uplink
shared channel (PUSCH), PUCCH, and the like are assigned.
An uplink reference signal is assigned to part of the PUSCH
and/or the PUCCH. An uplink radio frame consists of an
uplink RB pair. The uplink RB pair is the unit used such as
for assigning uplink radio resources and the like,
consisting of a frequency band of a predetermined width (RB
bandwidth) and a time slot (two slots=one subframe). An
uplink RB pair consists of two uplink RBs that are
continuous in time domain (RB bandwidth x . An uplink
RB consists of twelve sub—carriers in frequency domain and
seven SC-FDMA symbols in time domain. While uplink
subframes in one CC are discussed herein, uplink subframes
are defined for each CC.
_19_
Fig. 4 is a schematic block m showing an
exemplary configuration of the base station 101 in this
embodiment. The base station 101 includes a codeword
generating unit 401, a downlink subframe generating unit 402,
an OFDM signal itting unit (physical l
information notification unit) 404, a transmit antenna (base
station transmit antenna) 405, a receive antenna (base
station receive antenna) 406, an SC—FDMA signal receiving
unit (response information receiving unit) 407, an uplink
subframe processing unit 408, and a higher layer (higher
layer control information notification unit) 410. The
downlink subframe generating unit 402 has a physical
downlink control channel generating unit 403. The uplink
subframe processing unit 408 has a physical uplink control
channel extracting unit 409.
Fig. 5 is a schematic block diagram showing an
exemplary uration of the terminal 102 in this
ment. The terminal 102 includes a receive a
(terminal receive a) 501, an OFDM signal receiving
unit (downlink receiving unit) 502, a downlink subframe
processing unit 503, a codeword extracting unit (data
extracting unit) 505, a higher layer (higher layer control
information acquiring unit) 506, a se information
generating unit 507, an uplink subframe generating unit 508,
an SC—FDMA signal transmitting unit (response transmitting
unit) 510, and a transmit antenna (terminal transmit
antenna) 511. The nk subframe sing unit 503 has
a physical downlink control l extracting unit
(downlink control channel detecting unit) 504. The uplink
subframe generating unit 508 has a physical uplink control
channel ting unit (uplink control channel generating
unit) 509.
First, using Figs. 4 and 5, the flow of downlink data
ission and reception is described. At the base
station 101, transmit data (also called transport blocks)
sent from the higher layer 410 goes through processes such
as error correction coding and rate matching in the codeword
generating unit 401, and a codeword is generated. A maximum
of two codewords are transmitted simultaneously in a
subframe within a cell. The downlink subframe generating
unit 402 generates downlink subframes according to
instructions from the higher layer 410. The codeword
generated by the codeword generating unit 401 is first
converted to a modulation symbol sequence through a
modulation s such as phase shift keying (PSK)
modulation and ture amplitude modulation (QAM)
modulation. The modulation symbol sequence is also mapped
to REs of some RBs and downlink subframes for each antenna
port are generated through precoding. Downlink REs are
defined so as to respectively correspond to sub—carriers in
OFDM symbols. The transmit data sequence sent from the
higher layer 410 here contains control information r
layer control ation) for radio resource control (RRC)
signaling. The physical nk l channel generating
unit 403 generates a physical nk control channel. The
control information contained in the physical downlink
l channel (downlink control information, downlink
grant) includes information such as modulation and coding
scheme (MCS) indicating the modulation scheme used in
downlink and the like, downlink resources assignment
indicating RBs used for data transmission, HARQ control
information used for HARQ control (redundancy version, HARQ
process number, new data indicator), and PUCCH-TPC
(transmission power control) commands used for closed loop
controlling transmission power on the PUCCH. The downlink
me generating unit 402 maps the physical downlink
control channel to REs in downlink subframes according to
instructions from the higher layer 410. The nk
subframes for each antenna port generated by the downlink
subframe generating unit 402 are modulated into an OFDM
signal at the OFDM signal transmitting unit 404 and sent via
the it antenna 405.
_ 22 _
At the al 102, the OFDM signal is received by the
OFDM signal receiving unit 502 Via the receive antenna 501
and OFDM demodulation is performed. The downlink subframe
processing unit 503 first s a PDCCH (a first downlink
l channel) or an E—PDCCH (a second downlink control
channel) at the physical nk control channel extracting
unit 504. More specifically, the physical downlink control
channel extracting unit 504 decodes it in a region in which
a PDCCH can be placed (a first downlink control channel
region) or in a region in which an E-PDCCH can be placed (a
second downlink control channel region, a ial E—PDCCH),
and checks its cyclic redundancy check (CRC) bits ed
in e (blind decoding). That is, the physical downlink
control channel extracting unit 504 monitors a PDCCH placed
in the PDCCH region and an E—PDCCH placed in the PDSCH
region, which is different from the PDCCH region. If the
CRC bits match an ID preassigned by the base station, the
downlink subframe processing unit 503 decides that a PDCCH
or an E—PDCCH has been detected and extracts the PDSCH using
control information contained in the detected PDCCH or E—
PDCCH. More specifically, RE demapping and/or demodulation
corresponding to the RE mapping and/or modulation performed
at the downlink subframe ting unit 402 is applied.
The PDSCH extracted from the received downlink subframes is
-23..
sent to the codeword extracting unit 505. The codeword
extracting unit 505 performs rate matching, error tion
decoding, and the like corresponding to the rate matching
and error correction coding performed at the codeword
ting unit 401 and extracts transport blocks, which are
then sent to the higher layer 506. That is, if the physical
downlink control channel extracting unit 504 has detected a
PDCCH or H, the codeword extracting unit 505 extracts
transmit data on the PDSCH associated with the detected
PDCCH or H, and sends it to the higher layer 506.
Next, the flow of transmission and reception of HARQ
response information for downlink transmit data is described.
At the terminal 102, after the codeword extracting unit 505
determines whether transport blocks have been successfully
extracted or not, information indicating success/failure is
sent to the response informatiOn generating unit 507. The
response information generating unit 507 generates HARQ
se information and sends it to the physical uplink
control channel generating unit 509 in the uplink subframe
generating unit 508. In the uplink me generating unit
508, a PUCCH including the HARQ response information (uplink
control information) is generated by the physical uplink
control l generating unit 509 based on parameters sent
from the higher layer 506 and the resource in which the
PDCCH or E-PDCCH was placed at the physical downlink control
channel extracting unit 504, and the ted PUCCH is
mapped to RBs of uplink mes. That is, the response
information is mapped to a PUCCH resource to generate a
PUCCH. The SC-FDMA signal transmitting unit 510 applies SC-
FDMA modulation to the uplink subframes to te an SC—
FDMA signal, and transmits it via the transmit antenna 511.
At the base station 101, the SC—FDMA signal is received
by the SC—FDMA signal receiving unit 407 via the receive
antenna 406 and is subjected to SC—FDMA demodulation. The
uplink subframe sing unit 408 extracts the R85 to
which the PUCCH is mapped according to instructions from the
higher layer 410, and the physical uplink control l
ting unit 409 extracts the HARQ response control
information contained in the PUCCH. The extracted HARQ
response control information is sent to the higher layer 410.
The HARQ response control information is used for HARQ
control at the higher layer 410.
Next, PUCCH resources handled in the uplink subframe
generating unit 508 will be discussed. HARQ response
control information is spread over an SC-FDMA sample region
using a cyclically shifted pseudo nt—amplitude zero—
auto correlation (CAZAC) sequence, and further spread over
four SC—FDMA symbols in a slot using an orthogonal cover
code (OCC) having a code length of 4. The symbols spread
with the two codes are mapped to two RBs of different
frequencies. Thus, a PUCCH ce is defined by three
elements: the cyclic shift value, an onal code, and
mapped RBs. Cyclic shift in the A sample region can
also be represented by phase rotation that uniformly
increases in frequency domain.
Fig. 6 shows the structure of physical uplink resource
blocks in an uplink control channel region to which a PUCCH
is assigned (uplink control channel physical resources). An
RB pair consists of two RBs having different frequencies in
a first slot and a second slot. A PUCCH is placed in any of
RB pairs with m=O, l, 2,
Fig. 7 is a correspondence table g uplink control
channel logical resources. An example of PUCCH resources is
shown here representing a case where three orthogonal codes,
OCO, 0C1, and 0C2, six cyclic shift values, C80, C82, CS4,
CS6, CS8, and C810, and "m" which indicates a frequency
resource are assumed as the elements constituting the PUCCH.
A combination of an orthogonal code, a cyclic shift value,
and a value of m is uniquely defined for each value of nmmm“
which is an index ting a PUCCH resource (an uplink
l channel logical resource). The correspondence
n nmmqiand ations of an orthogonal code, a
cyclic shift value, and m illustrated in Fig. 7 is an
example and other ways of correspondence are possible. For
example, correspondence may be such that the cyclic shift
value or m varies with consecutive values of nmmah
Alternatively, CSl, CS3, C85, CS7, CS9, and C811 which are
cyclic shift values distinct from C80, C82, CS4, CS6, C88,
and C810 may be used. In the shown example, the value of m
is equal to or greater than N”. Frequency resources with m
smaller than Nm are Nm frequency resources reserved for
PUCCH transmission for feeding back channel ion
information.
Next, PDCCH and E—PDCCH are described. Fig. 8 shows
physical resource blocks PRB (physical RBs) and virtual
resource blocks VRB al RES) in PDCCH and PDSCH regions.
An RB in an actual subframe is called PRB, while an RB as a
logical ce used for RB assignment is called VRB. Nmbm
is the number of PRBs arranged in frequency direction within
a downlink CC. Numbers nmm are assigned to PRBs (or PRB
pairs), where nmm is O, l, 2, ..., Nmbm-l in ascending order
of frequency. The number of VRBs arranged in frequency
direction in a downlink CC is equal to NDHmB. Numbers nwm
are assigned to VRBs (or VRB pairs), where nwm is O, l,
2, ..., Nmbm—l in ascending order of frequency. PRBs and
VRBs are explicitly or implicitly/tacitly mapped to each
other. Numbers as referred to herein may be represented as
indices as well.
Now referring to Fig. 9, an example of mapping between
PRBs and VRBs in E—PDCCH region and PDSCH region is shown.
In this PRB—VRB mapping scheme, a PRB pair and a VRB pair
having the same nmm and nwm number are mapped to each other.
That is, a modulation symbol for transmit data or control
information assigned to RES of a VRB pair with nwm is mapped
to REs of the PRB pair with nmm=nwm as it is.
Next, ing to Fig. 10, another e of PRB—VRB
mapping in E—PDCCH region and PDSCH region is shown. In
this B mapping scheme, VRBs that are contiguous on the
frequency axis are mapped to PRBs at ons discrete on
the frequency axis. Further, the VRB in the first slot and
the VRB in the second slot of a VRB pair having the same nvm
number are mapped to PRBs at positions discrete on the
frequency axis. However, the VRB from the first slot is
mapped to the PRB in the first slot and the VRB from the
second slot is mapped to the PRB in the second slot. That
is, frequency hopping within a slot and slot hopping
(frequency hopping among slots) are applied.
As described, some (or all) of VRB pairs are defined as
an E—PDCCH region (a region in which an E—PDCCH can be
potentially placed). Further, in accordance with a B
g scheme specified explicitly or implicitly/tacitly,
some (or all) of PRB pairs in the PDSCH region or slot—
hopped PRBs are substantially defined as an E—PDCCH region.
Fig. 11 shows an exemplary numbering of VRBs in an E—
PDCCH region. Of Nmtm VRB pairs, Nmmmakm VRB pairs that
are configured in an E—PDCCH region are taken, and assigned
VRB index nEflmumwm for the E—PDCCH region as O, l, 2, ...,
NfiymmeB—l starting with the VRB pair of the lowest
frequency. That is, in frequency domain, a set of ND4mmHVRB
VRBs is configured for potential E—PDCCH ission
through the higher layer signaling (e.g., individual
signaling to terminals or common signaling in a cell).
Next, the structure of PDCCH and assignment of PUCCH
resources are bed. Fig. 12 illustrates the structure
of a PDCCH and assignment of PUCCH resources. A PDCCH
consists of multiple control l elements (CCE) in the
PDCCH . A CCE consists of multiple downlink resource
elements (resources each defined by one OFDM symbol and one
sub-carrier).
-29_
CCEs in the PDCCH region are given number nmE for
identifying the CCEs. The CCEs are numbered according to a
ined rule. A PDCCH consists of a set of multiple CCEs
(CCE aggregation). The number of CCEs constituting such a
set is called CCE aggregation level. The CCE ation
level for constructing the PDCCH is configured at the base
station 101 according to the coding rate set for the PDCCH
and the number of bits in downlink control information
(DCI)(control information sent on the PDCCH or H)
included in the PDCCH. Combinations of CCE aggregation
levels that can be used for a terminal are predetermined.
Also, a set of n CCEs is called "CCE ation level n".
A RE group (REG) consists of four REs contiguous in
frequency domain. Further, a CCE consists of nine different
REGs distributed in frequency domain and time domain within
the PDCCH region.- Specifically, interleaving is applied in
units of REG to all REGs that have been numbered in the
entire downlink CC using a block interleaver, and nine
contiguous REGs after the interleaving constitute one CCE.
For each al, a search space (SS), which is a
region in which to search for the PDCCH, is configured. An
SS consists of multiple CCEs. CCEs are numbered beforehand,
-30...
and an SS consists of CCEs having consecutive s. The
number of CCEs that tute a certain SS is predetermined.
An SS for each CCE aggregation level consists of a set of
multiple PDCCH candidates. SS is classified into cell-
specific search space (CSS or cell—specific SS) for which
the number of the CCE having the smallest number among the
CCEs constituting the SS is common in a cell, and al—
specific search space (USS or cific SS) for which the
lowest CCE index is specific to a terminal. In the CSS, a
PDCCH to which control information intended for multiple
terminals 102 such as system information and paging
information is assigned (or included), or a PDCCH to which a
downlink/uplink grant indicating a command for fallback to a
level transmission scheme or random access is assigned
(or included) can be placed.
The base station 101 transmits the PDCCH using one or
more CCEs included in the SS which is configured at the
terminal 102. The terminal 102 decodes the received signal
using one or more CCEs in the SS and performs processing for
detecting any PDCCH ed to the terminal. As mentioned
earlier, this process is called blind decoding. The
terminal 102 configures different 88s for different CCE
aggregation levels. The terminal 102 then performs blind
decoding using a predetermined combination of CCEs in the SS
which is distinct from one CCE aggregation level to another.
In other words, the terminal 102 performs blind decoding on
PDCCH candidates in $85 that vary among CCE aggregation
levels. The series of actions thus conducted at the
terminal 102 is called PDCCH monitoring.
Upon detecting a downlink grant in the PDCCH region,
the terminal 102 reports HARQ response information for
downlink transmit data (PDSCH) corresponding to the downlink
grant using a PUCCH resource corresponding to the CCE index
of the CCE having the lowest CCE index among the CCEs
constructing the PDCCH including the downlink grant.
Reversely, when placing a PDCCH containing a downlink grant,
the base station 101 places the PDCCH in CCEs that
correspond to the PUCCH resource in which the terminal 102
will report HARQ response information for nk transmit
data (PDSCH) ponding to the downlink grant. The base
station 101 es the HARQ response ation
corresponding to the PDSCH sent to the terminal 102 via the
PUCCH which it has scheduled. More specifically, as shown
in Fig. 12, among the CCEs that constitute a PDCCH
containing a downlink grant, a PUCCH resource that has an
index nmmmiequal to the sum of the CCE number nam of the
first CCE and N1, which is a cell specific parameter,
represents the PUCCH ce ed for HARQ response
information of downlink transmit data corresponding to the
downlink grant.
It is also possible that multiple PUCCH resources are
required for one PDCCH, such as when there are two or more
pieces of HARQ response information because two or more
rds are included in nk it data
corresponding to a downlink grant or when one piece of
response information is sent by diversity transmission using
multiple PUCCH resources, for example. In such a case, of
the CCEs constituting the PDCCH containing the downlink
grant, the PUCCH resource ponding to the lowest CCE
index and also a PUCCH resource having an index larger than
that PUCCH resource by one are used. More specifically, as
shoWn in Fig. 12, among the CCEs constituting the PDCCH
containing the downlink grant, the PUCCH resource having an
index nmmuiequal to the sum of the CCE number num of the
first CCE and cell-specific parameter N1, and the PUCCH
resource having an index nmmm1equal to the sum of the CCE
number ham of the first CCE, one, and the cell—specific
parameter N1 represent the PUCCH resources assigned for HARQ
response information of downlink transmit data corresponding
to the downlink grant. If two or more PUCCH resources are
required, PUCCH resources having s which are larger by
one may be used in a similar manner.
Next, the ure of E—PDCCH and assignment of PUCCH
resources are described. Fig. 13 shows the structure of E-
PDCCH and assignment of PUCCH resources. Note that the E—
PDCCH shown in Fig. 13 represents the E—PDCCH structure and
PUCCH resource assignment when cross—interleaving (a type of
interleaving in which individual elements constituting an E—
PDCCH are allocated across RBs, also called block
interleaving) is employed. An E—PDCCH ts of multiple
CCEs in an E—PDCCH region. Specifically, like a PDCCH, an
REG consists of four RES contiguous in frequency domain. A
CCE ts of nine different REGs distributed in ncy
domain and time domain in the E-PDCCH region. In the E—
PDCCH region, individual E—PDCCHs are allocated in the first
slot and the second slot.
CCEs in the E—PDCCH region are assigned s nDPmmEu
for identifying the CCEs. In the E—PDCCH , CCEs are
independently placed in the first slot and the second slot
and numbers for identifying the CCEs are also independently
assigned. In the described example, nfiymmfixE is configured
independently of ncuh That is, some of the values of n}
Pmmflmg overlap possible values of Dam.
Upon detecting a downlink grant in the E—PDCCH region,
_ 34 _
the terminal 102 reports HARQ response information for
downlink transmit data ) corresponding to the downlink
grant using a PUCCH resource based on the CCE index of the
CCE having the lowest CCE index among the CCEs constructing
the E-PDCCH containing the downlink grant. When assigning
an E—PDCCH containing a downlink grant, the base station 101
assigns the E-PDCCH in the CCE corresponding to the PUCCH
resource in which the terminal 102 will report HARQ response
information for the downlink transmit data (PDSCH)
corresponding to the nk grant. The base station 101
also receives the HARQ se information ponding to
the PDSCH sent to the terminal 102 via the PUCCH which it
has scheduled. More specifically, as shown in Fig. 13, a
PUCCH resource that has an index nmmmiequal to the sum of
the CCE number nbymmflmg of the first CCE among the CCEs that
constitute the E—PDCCH containing a downlink grant and cell
specific parameter N1 represents the PUCCH resource assigned
for HARQ response information of downlink transmit data
corresponding to the downlink grant. Since CCE index n”
PmmeE for CCEs in the E—PDCCH region and CCE index Ham for
CCEs in the PDCCH region are independently assigned as
mentioned above, when assigning one or more PDCCHs and one
or more E—PDCCHs in the same subframe, the base n 101
carries out scheduling of downlink grant assignment in CCEs
such that the CCE number hum of the first CCE of each PDCCH
_ 35 _
and the CCE number nbfmmflxE of the first CCE of each E-PDCCH
are all different numbers.
Alternatively, the base station 101 may assign nflymmflmE
and nag in connection with each other so that the CCE number
nCCE of the first CCE of PDCCHs and the CCE number nE'PDCC”CCE
of the first CCE of E—PDCCHs are all different s. For
example, the first t) value of the E-PDCCH
n am value is
configured to Nam or a certain value greater than NmE. This
keeps some of nE"'PDCCHccgvalues from pping possible
values of ham and thus avoids collisions of PUCCH resources
within the same subframe.
When multiple PUCCH resources are required for one E—
PDCCH, the PUCCH resource corresponding to the CCE index of
the CCE having the lowest CCE index among the CCEs
constructing the E—PDCCH containing the downlink grant and
the PUCCH resource having an index larger than that PUCCH
ce by one are used. More specifically, as shown in
Fig. 13, the PUCCH resource having index nmmm equal to the
sum of the CCE number nDymmflma of the first CCE among the
CCEs that constitute the E—PDCCH containing a downlink grant
and cell specific parameter N1, and the PUCCH resource
having index nmmuiequal to the sum of the CCE number n”
PmmeE of the first CCE, one, and the cell specific parameter
-36...
N1 represent the PUCCH resources assigned to HARQ response
information for downlink transmit data corresponding to the
downlink grant. If multiple PUCCH resources are required,
PUCCH resources having s which are larger by one may
be used in a similar manner. When assigning one or more
PDCCHs and one or more E—PDCCHs in the same subframe in such
a case, the base station 101 carries out scheduling of
downlink grant assignment in CCEs such that the CCE number
mum of the first CCE and the next largest CCE number mam of
each PDCCH and the CCE number m;of the first CCE and
the next largest CCE number nvpmaku;of each E-PDCCH are all
different numbers.
Next, another e of E-PDCCH ure and
assignment of PUCCH resources is shown. Fig. 14 shows the
structure of an E—PDCCH and assignment of PUCCH resources.
Note that the E—PDCCH shown in Fig. 14 represents the E—
PDCCH structure and PUCCH resource assignment when cross-
interleaving is not employed. The E—PDCCH consists of
multiple VRBs in the E—PDCCH region. ically, unlike
the PDCCH, the E—PDCCH is made up of VRBs instead of CCEs,
being structured as a set of one or more contiguous VRBs.
The number of VRBs tuting such a set is called VRB
aggregation level. That is, in an E—PDCCH region to which
cross—interleaving is not applied, an SS consists of
multiple VRBs. The VRB aggregation level with which to
construct an E—PDCCH is configured at the base station 101
according to the coding rate set for the E—PDCCH and the
number of bits in DCI to be included in the E—PDCCH.
Combinations of VRB aggregation levels that can be used for
the terminal 102 are predetermined, and the al 102
performs blind decoding using the predetermined combinations
of VRBs in a SS. In the H region, individual E—PDCCHs
are ed in the first slot and the second slot.
VRBs in the E—PDCCH region are assigned numbers nDPmGE“
for identifying the VRBs. In the E—PDCCH region, VRBs
constituting dual E—PDCCHs are placed in the first
slot and the second slot and numbers for identifying the
VRBs are also independently assigned. In the described
example, nflymmimg is configured independently of Ham. That
is, some of the values of E-PDCCH
n mm overlap possible values
of nmE.
Upon detecting a downlink grant in the E—PDCCH region,
the terminal 102 s HARQ response information for
downlink transmit data (PDSCH) corresponding to the downlink
grant using a PUCCH resource based on the VRB index of the
VRB having the lowest VRB index among the VRBs constructing
the H containing the downlink grant. Reversely, when
-38...
assigning an E—PDCCH containing a downlink grant, the base
station 101 assigns the E—PDCCH in the VRB corresponding to
the PUCCH resource in which the terminal 102 will report
HARQ response ation for the downlink it data
(PDSCH) ponding to the downlink grant. The base
station 101 also receives the HARQ response information
corresponding to the PDSCH sent to the terminal 102 via the
PUCCH which it has scheduled. More specifically, as shown
in Fig. 14, a PUCCH resource that has an index nmmaiequal to
the sum of the VRB number nbfmmwm of the first VRB among
the VRBs that constitute the H containing a downlink
grant and cell specific parameter N1 represents the PUCCH
resource assigned for HARQ response information of downlink
transmit data corresponding to the downlink grant. Since
VRB index nflymmflmB for VRBs in the H region and CCE
index Hum for CCEs in the PDCCH region are independently
assigned as mentioned above, when assigning one or more
PDCCHs and one or more E—PDCCHs in the same subframe or
assigning two or more E—PDCCHs in the same subframe, the
base station 101 carries out scheduling of downlink grant
assignment in CCEs or VRBs such that the CCE number nam or
nflfmmflmE of the first CCE of each PDCCH or E—PDCCH and the
VRB number nEQDmmwm of the first VRB of each E-PDCCH are all
different numbers.
_39_
When multiple PUCCH resources are required for one E—
PDCCH, the PUCCH resource corresponding to the VRB index of
the VRB having the lowest VRB index among the VRBs
constructing the E—PDCCH containing the downlink grant and
the PUCCH resource having an index larger than that PUCCH
resource by one are used. More specifically, as shown in
Fig. 14, the PUCCH resource having index nmmmiequal to the
sum of the VRB number nflqmmamg of the first VRB among the
VRBs that constitute the E—PDCCH containing a downlink grant
and cell specific parameter N1, and the PUCCH resource
having index nmmqiequal to the sum of the VRB number n”
Pmmflmg of the first VRB, one, and the cell ic parameter
N1 represent the PUCCH ces assigned to HARQ response
ation for downlink transmit data corresponding to the
downlink grant. If multiple PUCCH ces are required,
PUCCH resources having indices which are larger by one may
be used in a similar manner.
While Fig. 14 describes re-assignment of nflmmmeB
ng from 0, nE'PDCCHVRa may be mm itself originally
assigned to VRBs. atively, re—assigned nE"PDCCHmm may be
used in blind decoding of a VRB set while nwm may be used
for associating PUCCH resources as shown in Fig. 15.
Mapping from an E—PDCCH resource to a PUCCH resource may use
a similar mapping scheme to the one described with Fig. 14
_ 40 _
just with replacement of E-PDCCH
n vm with nwm.
The foregoing description showed a g scheme in
which a PUCCH resource is uniquely determined from
configuring parameters for the E-PDCCH region, dynamic E—
PDCCH resources, and a cell specific parameter for g
from an H resource to a PUCCH ce. Next, a
mapping scheme which determines a PUCCH resource based on a
terminal specific parameter will be described.
Fig. 16 illustrates the flow of a downlink data
transmission and response procedure between the base station
101 and terminal 102. The base station 101 broadcasts a
cell ic parameter N1 using a broadcast channel, and
the terminal 102 obtains broadcast information (step 81601).
N1 indicates the common shift value terminal—commonly
configured. .Although the base station 101 broadcasts N1 in
the illustrated example, this is not limitative. Similar
effects may be achieved with notification of N1 via
individual signaling (RRC signaling) ed to each
terminal 102.
Then, the base station 101 uses RRC signaling to notify
the terminal 102 of l information specifying
(configuring, indicating) an E—PDCCH region, and the
terminal 102 ures an E—PDCCH region based on the
control information (step 81602). Here, for specifying the
E—PDCCH region, a scheme that indicates some or all of RBs
within a frequency band is employed as mentioned above.
Alternatively, in combination with the scheme, some
subframes in time domain may be specified as subframes in
which the E—PDCCH can be placed. For example, a scheme of
specifying a subframe interval and an offset from a
reference subframe may be used. Alternatively, it is
possible to ent in bit map form whether an H can
be placed in a radio frame (10 subframes) or subframes in
multiple radio frames.
Then, the base station 101 uses RRC signaling to notify
the terminal 102 of control information specifying ND, which
is a parameter that can be configured specifically for each
terminal 102, and the terminal 102 ures ND based on
the control ation (step 81603). ND indicates the
dual shift value which is configured specifically for
each terminal 102. While the base station 101 ures an
E—PDCCH region and thereafter ND is configured in the
illustrated example, this is not limitative. For example,
the base station 101 may configure ND and then the E—PDCCH
region, or the E—PDCCH region and ND may be configured at
the same time. Also, the default value of ND may be
configured to zero, in which case when the signaling at step
81603 is not performed (i.e., ND is not configured), the
subsequent process may be continued with ND assumed to be
zero.
Then, using the PDCCH or E—PDCCH, the base station 101
transmits a downlink grant and downlink transmit data
corresponding to the downlink grant to the terminal 102,
which receives the downlink grant and downlink transmit data
(step 51604). After receiving the downlink transmit data,
the terminal 102 tes HARQ response information.
Finally, the terminal 102 ines the PUCCH resource
based on N1 obtained as per step 81601, E—PDCCH region
uration ation obtained as per step 81602, ND
obtained as per step 81603, and resource information for the
downlink grant detected at step 31604, and uses the
determined PUCCH resource to report HARQ response
information (step 81605).
Next, the H structure and PUCCH resource
assignment in this case are described. Fig. 17 shows the
structure of E-PDCCH and exemplary assignment of PUCCH
ces. Note that the E-PDCCH shown in Fig. 17
represents the E-PDCCH structure and PUCCH resource
_.43_
assignment when cross—interleaving is employed, and the CCE
structure and assignment of CCE indices in the E—PDCCH
region are similar to Fig. 13.
The PUCCH resource determined by adding ND, a terminal-
specific parameter, to the CCE number nmpmakw of the first
CCE among the CCEs that constitute the E—PDCCH containing
the downlink grant is used. More specifically, as shown in
Fig. 17, the PUCCH ce that has index nmmmiequal to the
sum of the CCE number #3chCHmm of the first CCE among the
CCEs that constitute the H containing the downlink
grant, the terminal specific parameter ND, and the cell
specific parameter N1 represents the PUCCH ce assigned
for HARQ response ation of downlink transmit data
corresponding to the downlink grant. While CCE index n}
mefimE for CCEs in the E—PDCCH region and CCE index mam for
CCEs in the PDCCH region are independently assigned as
mentioned above, even if there is an overlap between Ham and
nflymmflmE, ces are shifted by ND, which is a al
specific parameter, in the cases of Figs. 12 and 17. This
can avoid overlap of PUCCH resources without involving
complicated scheduling. In addition, because resources can
be d by ND individually for each terminal 102,
complexity of E-PDCCH scheduling can be reduced even when E—
PDCCH is transmitted to multiple terminals 102 in separate
_44_
E—PDCCH regions in the same subframe. In other words,
because PUCCH resources corresponding to smaller CCE indices
are used when the elements constituting an E—PDCCH in the E—
PDCCH region are bered, the problem of being t
to PUCCH resource collisions can be resolved and the
probability of PUCCH resource collisions can be reduced. If
multiple PUCCH resources are required, PUCCH resources
having indices which are larger by one may be used.
Next, another example of E—PDCCH structure and PUCCH
resource assignment in this case is described. Fig. 18
shows an example of E—PDCCH structure and assignment of
PUCCH resources. Note that the H shown in Fig. 18
represents the E—PDCCH ure and PUCCH resource
assignment when interleaving is not employed, and the
VRB structure and assignment of VRB index in the E—PDCCH
region are similar to Fig. 14.
As illustrated in Fig. 18, the PUCCH resource having
index npmmfl that equals the H
sum of the VRB number n wm of
the first VRB among the VRBs constituting the E—PDCCH
containing the downlink grant, the terminal specific
parameter ND, and the cell specific parameter N1 represents
the PUCCH ce assigned to HARQ response information for
downlink transmit data corresponding to the downlink grant.
While VRB index nflfmmfimg for VRBs in the E-PDCCH region and
CCE index Dam for CCEs in the PDCCH region are independently
assigned as ned above, even if there is an overlap
between num and nfifmmflmg, resources are shifted by ND, which
is a terminal specific parameter, in the cases of Figs. 12
and 18. This achieves similar effects to the cross-
interleaving case described in Fig. 17.
Next, the E—PDCCH structure and PUCCH resource
assignment with the downlink grant placed in the second slot
will be described. Fig. 19 shows an example of the E—PDCCH
ure and assignment of PUCCH resources. Note that the
E—PDCCH shown in Fig. 19 represents the E—PDCCH structure
and PUCCH resource assignment when cross-interleaving is
ed, where the CCE structure and assignment of CCE
index in the E—PDCCH region are similar to Fig. 13 or 17
except for slots.
As illustrated in Fig. 19, like Fig. 17, the PUCCH
ce that has index nmmuiequal to the sum of the CCE
number E of the first CCE among the CCEs that
constitute the E—PDCCH containing a downlink grant, the
terminal specific parameter ND, and the cell specific
ter N1 represents the PUCCH resource assigned to HARQ
response information for downlink transmit data
corresponding to the downlink grant. uently, also in
the case of E-PDCCH placement in the second slot, overlap of
PUCCH resources is prevented due to shift by ND terminal—
specifically configured even if an E—PDCCH placed in the
first slot addressed to other terminal and the CCE number nD
PDCCH
am of the first CCE are the same.
Much the same applies to a no cross—interleaving case.
Fig. 20 shows an example of the H structure and
assignment of PUCCH resources. Note that the E-PDCCH shown
in Fig. 20 represents the E—PDCCH structure and PUCCH
resource assignment when cross-interleaving is ed,
where the VRB structure and assignment of VRB index in the
E—PDCCH region are similar to Fig. 14 or 18 except for slots.
As shown in Fig. 20, like Fig. 18, the PUCCH resource
that has index nmmmiequal to the sum of the VRB number n“
Pmmfimg of the first VRB among the VRBs that constitute the E—
PDCCH containing a downlink grant, the al specific
ter ND, and the cell specific parameter N1 represents
the PUCCH resource assigned to HARQ response information for
downlink transmit data corresponding to the downlink grant.
Consequently, also in the case of E—PDCCH placement in the
second slot, overlap of PUCCH resources is prevented due to
shift by ND configured for each al even if an E-PDCCH
placed in the first slot addressed to other terminal and the
VRB number mg of the first VRB are the same. While
assignment of VRB index HE"PDCCHwm is shown above, similar
effects can be achieved by introducing the terminal specific
parameter ND also in a case where nwm is instead used for
identification.
While the above description assumes that a downlink
grant can be placed in the second slot, this is not
limitative. For example, the downlink grant may be
configured to be usually placed in the first slot only and
may be enabled to be placed also in the second slot if
certain control information is configured such as via RRC
signaling. Alternatively, the al 102 may provide the
base station 101 with terminal capability information
showing whether the terminal 102 ts reception of a
downlink grant in the second slot or not, and a downlink
grant may be sent in the second slot only to terminals 102
that support reception of nk grant in the second slot.
This zes flexibility in E-PDCCH scheduling in
accordance with delay time from detection of a downlink
grant to detection of downlink data and ission of
response information.
As described, when transmitting downlink transmit data
in relation to a downlink grant in a E—PDCCH region, the
base station 101 assigns the downlink grant to a E—PDCCH
resource that ponds to the uplink control channel
resource that will be used for reporting HARQ response
ation corresponding to the downlink it data.
ably, the base station 101 adds a specified value to
the index of the element having the lowest index among the
elements constructing the E—PDCCH resource. The PUCCH
resource having an index equal to the sum is the PUCCH
resource corresponding to the E—PDCCH resource. The base
station 101 then rs this uplink control channel
ce to extract HARQ response information.
If the terminal 102 detects a downlink grant in the E—
PDCCH region, it reports HARQ response information for
downlink transmit data associated with the downlink grant
using a PUCCH resource ponding to the E—PDCCH resource
in which the downlink grant was detected.
In other words, the base station 101 sends the terminal
102 an E—PDCCH placed in a PDSCH region. The terminal 102
then monitors the PDCCH placed in the PDCCH region and an E—
PDCCH placed in a PDSCH different from the PDCCH region. If
the terminal 102 detects an E-PDCCH, it extracts transmit
data on the PDSCH associated with the detected E—PDCCH,
tes se information for the extracted transmit
data, and generates a PUCCH by mapping the response
information to the PUCCH resource corresponding to the E—
PDCCH resource in which the E—PDCCH was detected, and
reports the response information to the base station 101.
The base station 101 extracts the PUCCH to which the
response information for the transmit data on the PDSCH
associated with the E—PDCCH is mapped, from the PUCCH
resource corresponding to the E-PDCCH resource in which the
H was placed.
This allows an uplink control channel to be dynamically
allocated to the terminal even when a downlink grant is
transmitted and received using an E—PDCCH. Consequently,
uplink control channels can be utilized efficiently.
The base station 101 also explicitly notifies each
terminal 102 of a parameter for shifting PUCCH resources and
the terminal 102 determines the PUCCH ce in
consideration of the notified parameter. Preferably, the
parameter is added to the lowest index of the elements
constructing an E—PDCCH resource.
In other words, the base station 101 notifies the
al 102 of l information including a parameter
indicating the individual shift value configured
individually for each terminal 102. The terminal 102
receives the control information containing the individual
shift parameter, and maps response information to the PUCCH
resource which is determined by adding the individual shift
value to the E—PDCCH resource index to generate a PUCCH.
The base station 101 extracts the PUCCH from the PUCCH
resource ined by adding the individual shift value to
the E—PDCCH ce index to obtain response ation.
This tates avoidance of overlap of uplink control
channels among terminals in dynamic assignment of uplink
control channels to the terminal 102 in a scenario where the
base station 101 and the terminal 102 transmit and receive
downlink grants using H. E—PDCCH or PDCCH thus can be
efficiently used.
When cross-interleaving is not employed, if the
terminal 102 detects an H containing a downlink grant,
it reports HARQ response information via a PUCCH resource
having index nmmw determined from the VRB number E-PDCCH
n VRB Of
the first VRB among the VRBs constituting the E—PDCCH
containing the downlink grant. If the terminal 102 detects
a PDCCH containing a downlink grant, it reports HARQ
response information via a PUCCH resource having index nun“
-51—
determined from the CCE number nam of the first CCE among
the CCEs constituting the PDCCH containing the downlink
grant.
When cross—interleaving is employed, upon detecting an
E—PDCCH containing a downlink grant, the terminal 102
reports HARQ response information via a PUCCH resource
having index nmmw determined from the E-PDCCH
CCE number n CCE Of
the first CCE among the CCEs tuting the E—PDCCH
containing the downlink grant. If the terminal 102 detects
a PDCCH containing a downlink grant, it reports HARQ
response information Via a PUCCH ce having index nmmw
determined from the CCE number mum of the first CCE among
the CCEs constituting the PDCCH containing the downlink
grant.
Consequently, PUCCH resources corresponding to E—PDCCH
and PUCCH resources corresponding to PDCCH can be shared.
It is therefore not ary to define a new PUCCH resource
for E—PDCCH, which reduces processing at the terminal and
the base n.
(Second Embodiment)
The first ment described above showed explicit
signaling of a shift (offset) value for PUCCH resources. In
_52_
the second embodiment of the invention described below, a
shift (offset) value for PUCCH ces is
implicitly/tacitly specified. The communications system in
this embodiment can employ a similar configuration to the
communications system shown in Fig. l. The configurations
of the base station 101 and terminal 102 in this ment
may be r to the functional blocks shown in Figs. 4 and
Fig. 21 shows the flow of a downlink data transmission
and response procedure between the base station 101 and the
terminal 102. The base station 101 broadcasts N1, a cell
specific parameter, using a broadcast channel, and the
terminal 102 obtains broadcast information (step 82101).
While the base station 101 broadcasts N1 in the illustrated
example, this is not limitative. Similar effects may be
achieved by the base station 101 notifying N1 via individual
ing (RRC signaling) addressed to each terminal, for
example.
The base station 10l then uses RRC ing to notify
the al 102 of control information specifying an E-
PDCCH region, and the terminal 102 configures an E—PDCCH
region based on the control information (step 82102).
_53._
Then, using the PDCCH or E—PDCCH, the base station 101
transmits a downlink grant and downlink transmit data
corresponding to the downlink grant to the terminal, and the
terminal 102 receives the nk grant and downlink
transmit data (step 82103).
The terminal 102 then uses a ermined method to
ine ND according to information configured for each
terminal 102 (step 82104).
Finally, the terminal 102 ines the PUCCH resource
based on N1 obtained as per step S2101, E—PDCCH region
configuration information obtained as per step 82102,
resource information for the downlink grant detected at step
82103, and ND determined as per step S2104, and uses the
determined PUCCH resource to report HARQ response
information (step 82105).
At step 2104, ND may be determined with such methods as
follows.
(1) ND is determined from configuration information for
E—PDCCH region obtained at step S2102. For example, ND is
calculated using the VRB index of the VRB having the lowest
VRB index nwm among the VRBs constructing the E—PDCCH region.
Alternatively, the VRB index itself may be used as ND.
(2) ND is determined from SS configuration for
monitoring downlink grants used at step 2103. For example,
as shown in Fig. 22, if the E—PDCCH is detected in the first
slot, the ND value is configured to A (a ermined
value); if the E—PDCCH is detected in the second slot, the
ND value is configured to B (a predetermined value) which is
different from A. Alternatively, in a case of an MIMO-
multiplexed E—PDCCH, ND corresponding to the index of the
layer (transmission port) to which the E—PDCCH is assigned
may be used.
(3) ND is determined from other configuration
information configured specifically for the terminal. For
example, an ID assigned to the terminal may be used to
ate ND. For instance, ND may be calculated using an ID
assigned to the terminal and Nam or a cell specific
parameter specified by the base station, or by performing
remainder calculation on the ID. Alternatively, a value
that is ated with the transmission port or scramble
code ID used for nk data transmission in e may
be used.
As described, the base station 101 implicitly/tacitly
-55_
notifies each terminal 102 of a parameter for ng PUCCH
ces and the terminal 102 determines the PUCCH resource
in consideration of the parameter. ably, the
parameter is added to the lowest index of the elements
constructing the E-PDCCH resource.
This facilitates avoidance of p of uplink control
channels among terminals in c ment of uplink
control channels to the terminal 102 in a scenario where the
base station 101 and the terminal 102 transmit and receive
downlink grants using E—PDCCH. E—PDCCH or PDCCH thus can be
efficiently used.
(Third Embodiment)
The first embodiment described above showed semi—static
signaling of a shift (offset) value for PUCCH resources. In
the third embodiment of the invention described below, a
shift (offset) value for PUCCH resources is dynamically
indicated. The communications system in this embodiment can
employ a similar configuration to the communication system
shown in Fig. l. The configurations of the base station 101
and terminal 102 in this embodiment may be similar to the
functional blocks shown in Figs. 4 and 5.
Fig. 23 shows the flow of a downlink data transmission
-56—
and response procedure between the base station 101 and the
terminal 102. The base station 101 asts cell specific
parameter N1 using a broadcast channel and the terminal 102
obtains broadcast information (step 82301). Although the
base station 101 broadcasts N1 in the illustrated example,
this is not limitative. Similar effects may be achieved by
the base station 101 notifying N1 via individual signaling
(RRC signaling) intended to each terminal 102, for example.
Then, the base station 101 uses RRC signaling to notify
the terminal 102 of control ation ting an E—
PDCCH region, and the terminal 102 ures an E—PDCCH
region ing to the control information (step 52302).
The base station 101 then uses RRC signaling to notify
the terminal 102 of control information indicating multiple
values of ND, and the terminal 102 configures multiple ND
values according to the control ation (step 82303).
The base station 101 then sends a downlink grant and
downlink transmit data corresponding to the downlink grant,
using a PDCCH or H, to the terminal 102, which
receives the downlink grant and downlink transmit data (step
S2304). The downlink grant contains information indicating
which one of the multiple ND values should be used.
-57...
Finally, the terminal 102 determines the PUCCH resource
based on N1 obtained as per step 82301, H region
configuration information obtained as per step 82302,
downlink grant resource information detected as per step
82304, and ND indicated as per steps 82303 and $2304, and
uses the determined PUCCH resource to report HARQ se
information (step 82305).
As a way to configure the multiple ND values at step
2303, the number of ND values is predetermined as shown in
Fig. 24 and the ND value corresponding to each index is
notified. In the example of Fig. 24, there are four
different ND values; any of four values A, B, C, and D is
notified. The nk grant at step 82304 has an
information field in which an index specifying ND is
indicated, and ND can be ined by extracting the value
of the ation field. At step 2303, it is not necessary
to configure all of the multiple ND values. For example,
some of the values may be designated as fixed values (e.g.,
zero).
As shown above, the base station 101 dynamically
indicates a parameter for shifting PUCCH resources for each
terminal 102, and the terminal 102 determines the PUCCH
-58—
resource in consideration of the indicated parameter.
Preferably, the parameter is added to the lowest index of
the elements constructing an E—PDCCH resource.
This facilitates avoidance of overlap of uplink l
channels among terminals 102 in dynamic assignment of uplink
l channels to the terminal 102 in a scenario where the
base n 101 and the terminal 102 transmit and receive
downlink grants using H. E—PDCCH or PDCCH thus can be
efficiently used.
The first embodiment showed semi—static and explicit
notification of ND, the second embodiment showed
it/tacit notification of ND, and the third embodiment
showed dynamic and explicit notification of ND. These
schemes may also be used in combination. For example, a
formula to determine an ND value may be predefined, and a
parameter which is semi—statically and explicitly indicated,
a parameter which is implicitly/tacitly indicated, and/or a
parameter which is dynamically and itly indicated may
be introduced as an element (or a term) of the formula.
Alternatively, the PUCCH resource may also be ined by
adding the multiple ND values to an E—PDCCH resource index.
While the above described embodiments use resource
elements and resource blocks as the units of g data
channels, control channels, PDSCH, PDCCH, and reference
signals, and use subframe and radio frame as the units of
transmission in temporal direction, they are not tive.
Similar effects can be achieved using region and time units
represented by certain frequency and time instead.
While an enhanced physical downlink control channel 103
placed in a PDSCH region is referred to as E—PDCCH so that
it is clearly distinguished from the conventional physical
downlink control channel (PDCCH) in the above described
embodiments, this is not limitative. Even where the two
types of l are both called PDCCH, implementing
different operations for an enhanced al downlink
control channel placed in a PDSCH region and the
conventional physical downlink control l placed in a
PDCCH region is substantially lent to the embodiments
in which E—PDCCH and PDCCH are distinguished.
While the above described embodiments showed a case
where always a single nk grant is received, this is
not limitative. For example, even in a scenario where
multiple downlink grants can be received, such as when
downlink grants for multiple cells are received at a time,
the processes described in the embodiments may be performed
for reception of a single downlink grant to attain similar
effects.
Programs according to the present ion to run in a
base station and a terminal are programs that control a CPU
and the like (programs that cause a computer to function) so
that the functionality of the embodiments of the invention
described above is realized. ation handled in these
devices is temporarily saved in random access memory (RAM)
during its processing, and then stored in any of various
kinds of read-only memory (ROM) and/or a hard disc drive
(HDD), from which it is read or modified or written by a CPU
as necessary. ing media for storing the programs may
be any of semiconductor media (e.g., ROM, non—volatile
memory card), optical recording media (e.g., digital
versatile disc (DVD), magneto—optical disc (MO), mini—disc
(MD), compact disc (CD), or blu-ray disc (BD)), magnetic
recording media (e.g., magnetic tape, flexible disc), and
the like. Also, in addition to realizing the functionality
of the above described embodiments by execution of a loaded
program, the functionality of the present ion can also
be realized through cooperative processing with an operating
system or other application programs in ance with
ctions from such a program.
For bution in a market, the ms may be
stored and buted on portable recording media or
transferred to a server computer connected via a network
such as the Internet. In this case, a storage device of the
server computer is also included in the present invention.
Also, part or all of the base station and terminal described
in the embodiments may be realized by large scale
integration (LSI), which is typically an integrated circuit.
The functional blocks of the base station and the terminal
may be either dually implemented in chips or some or
all of them may be integrated into a chip. An integrated
t may be realized as a special purpose circuit or a
general—purpose processor instead of LSI. If an integrated
circuitry technology that replaces LSI emerges with progress
in semiconductor technology, integrated circuitry based on
such a technology could be employed.
While the embodiments of the t invention have
been described with reference to the drawings, specific
configurations are not limited to the embodiments and design
changes within the scope of the invention are also
encompassed. Various modifications may be made to the
present invention within the scope defined by the claims,
and an embodiment ced by combining appropriate
technical means disclosed in different embodiments also
._62_
falls within the technical scope of the invention. An
arrangement in which elements described in the embodiments
and having similar effects are interchanged is also
encompassed.
rial Applicability
The present invention is advantageous for application
to a ss base station device, wireless terminal ,
wireless ications system, and/or a wireless
communication method.
Reference Signs List
101 base station
102 terminal
103 enhanced physical downlink control channel
104 downlink transmit data
105 physical uplink control channel
401 codeword generating unit
402 downlink subframe generating unit
403 physical downlink control channel generating unit
404 OFDM signal transmitting unit
405, 511 transmit a
406, 501 receive antenna
407 SC—FDMA signal receiving unit
408 uplink subframe processing unit
409 physical uplink control channel extracting unit
410, 506 higher layer
502 OFDM signal receiving unit
503 downlink me processing unit
504 physical downlink control channel extracting unit
505 codeword extracting unit
507 response information generating unit
508 uplink subframe generating unit
509 physical uplink control channel generating unit
510 SC-FDMA signal transmitting unit
2501 base station
2502 al
2503 physical downlink control channel
2504 downlink it data
2505 physical uplink control channel
Claims (20)
1. A terminal apparatus that is configured to and/or programmed to communicate with a base station apparatus, the terminal tus comprising: a downlink l channel detecting unit configured to and/or programmed to detect an Enhanced Physical Downlink Control Channel (EPDCCH), and a response transmitting unit configured to and/or programmed to transmit Hybrid Automatic Repeat reQuest (HARQ) se ation using a first Physical Uplink Control Channel (PUCCH) resource for a Physical nk Shared l (PDSCH) transmission ted by a detection of the EPDCCH, the first PUCCH resource being determined on the basis of at least a lowest element index used to construct the EPDCCH and a first value which is determined, within a plurality of values, from a field in downlink control information of the EPDCCH.
2. The terminal apparatus according to claim 1, wherein the first PUCCH resource is determined further on the basis of at least a second value which is configured by a dedicated Radio Resource Control (RRC) signal.
3. The terminal apparatus according to claim 1, wherein the first PUCCH resource is determined further on the basis of at least a third value which is determined from an antenna port used for the EPDCCH transmission.
4. The terminal tus ing to claim 1, wherein the first PUCCH resource is determined further on the basis of at least a second value which is configured by a dedicated Radio Resource Control (RRC) signal and a third value which is determined from an antenna port used for the EPDCCH transmission.
5. The terminal apparatus according to claim 1, wherein the downlink control channel ing unit is further configured to and/or programmed to detect a Physical Downlink l CHannel (PDCCH), and the response transmitting unit is further configured to and/or programmed to transmit HARQ response information using a second PUCCH resource for a PDSCH ission indicated by a detection of the PDCCH, the second PUCCH resource being determined on the basis of at least a lowest element index used to construct the PDCCH and a fourth value which is common in a cell.
6. The terminal apparatus according to claim 1, wherein the lowest element index used to construct the EPDCCH is an index of an initial element among one or a plurality of elements used to construct the EPDCCH.
7. A base station apparatus that is configured to and/or programmed to communicate with a al apparatus, the base station apparatus comprising: a physical control information notification unit configured to and/or mmed to transmit an Enhanced Physical Downlink Control Channel (EPDCCH), and a response information receiving unit configured to and/or programmed to receive Hybrid tic Repeat reQuest (HARQ) response information using a first Physical Uplink Control Channel (PUCCH) resource for a Physical Downlink Shared CHannel (PDSCH) transmission associated with the EPDCCH, the first PUCCH resource being determined on the basis of at least a lowest element index used to construct the EPDCCH and a first value which is determined, within a plurality of values, from a field in downlink control ation of the EPDCCH.
8. The base station apparatus according to claim 7, wherein the first PUCCH ce is determined further on the basis of at least a second value which is configured by a dedicated Radio Resource Control (RRC) signal.
9. The base station apparatus according to claim 7, wherein the first PUCCH resource is determined further on the basis of at least a third value which is determined from an antenna port used for the EPDCCH transmission.
10. The base station apparatus according to claim 7, wherein the first PUCCH resource is ined further on the basis of at least a second value which is ured by a dedicated Radio Resource Control (RRC) signal and a third value which is determined from an antenna port used for the EPDCCH transmission.
11. The base n apparatus according to claim 7, wherein the physical control information notification unit is r ured to and/or programmed to transmit a Physical Downlink Control CHannel (PDCCH), and the se information receiving unit is further configured to and/or programmed to receive HARQ response information using a second PUCCH resource for a PDSCH transmission ated with the PDCCH, the second PUCCH resource being determined on the basis of at least a lowest element index used to construct the PDCCH and a fourth value which is common in a cell.
12. The base station apparatus according to claim 7, wherein the lowest t index used to construct the EPDCCH is an index of an initial element among one or a plurality of elements used to construct the EPDCCH.
13. An integrated circuit used in a al apparatus that is configured to and/or mmed to communicate with a base station apparatus, the integrated t comprising: a downlink control channel ing unit configured to and/or mmed to detect an Enhanced Physical Downlink Control Channel (EPDCCH), and a response transmitting unit configured to and/or programmed to transmit Hybrid Automatic Repeat reQuest (HARQ) response information using a Physical Uplink Control Channel (PUCCH) resource for a Physical Downlink Shared CHannel (PDSCH) transmission indicated by a detection of the EPDCCH, the PUCCH ce being determined on the basis of at least a lowest t index used to construct the EPDCCH and a value which is ined, within a plurality of values, from a field in downlink control information of the EPDCCH.
14. An ated circuit used in a base station apparatus that is configured to and/or programmed to communicate with a al apparatus, the integrated circuit comprising: a physical l information notification unit configured to and/or programmed to transmit an Enhanced Physical Downlink Control Channel (EPDCCH), and a response information receiving unit configured to and/or programmed to receive Hybrid tic Repeat reQuest (HARQ) response information using a Physical Uplink Control Channel (PUCCH) resource for a Physical Downlink Shared CHannel (PDSCH) transmission associated with the EPDCCH, the PUCCH resource being determined on the basis of at least a lowest element index used to construct the EPDCCH and a value which is determined, within a plurality of values, from a field in downlink control information of the EPDCCH.
15. A communication method used by a terminal apparatus that is configured to and/or programmed to communicate with a base station apparatus, the communication method comprising: detecting an Enhanced Physical Downlink Control Channel (EPDCCH), and transmitting Hybrid Automatic Repeat reQuest (HARQ) se information using a al Uplink Control Channel (PUCCH) resource for a Physical Downlink Shared CHannel (PDSCH) ission indicated by a detection of the EPDCCH, the PUCCH resource being determined on the basis of at least a lowest element index used to construct the EPDCCH and a value which is determined, within a plurality of values, from a field in nk control information of the EPDCCH.
16. A communication method used by a base n apparatus that is configured to and/or mmed to communicate with a terminal apparatus, the communication method comprising: itting an Enhanced Physical Downlink Control Channel (EPDCCH), and receiving Hybrid Automatic Repeat reQuest (HARQ) response information using a Physical Uplink Control Channel (PUCCH) resource for a Physical Downlink Shared CHannel ) transmission associated with the EPDCCH, the PUCCH resource being determined on the basis of at least a lowest t index used to construct the EPDCCH and a value which is determined, within a plurality of values, from a field in downlink control information of the EPDCCH.
17. A terminal apparatus substantially as herein described or exemplified, with reference to the accompanying drawings.
18. A base station apparatus substantially as herein described or exemplified, with reference to the accompanying drawings.
19. An integrated circuit substantially as herein described or exemplified, with reference to the anying drawings.
20. A communication method ntially as herein described or exemplified, with reference to the accompanying drawings.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011160594A JP5895388B2 (en) | 2011-07-22 | 2011-07-22 | Terminal device, base station device, integrated circuit, and communication method |
JP2011-160594 | 2011-07-22 | ||
PCT/JP2012/068339 WO2013015195A1 (en) | 2011-07-22 | 2012-07-19 | Terminal, base station, communication system and communication method |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ621393A NZ621393A (en) | 2014-10-31 |
NZ621393B2 true NZ621393B2 (en) | 2015-02-03 |
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